CA1059837A - Apparatus for making corrugated flexible metal tubing - Google Patents
Apparatus for making corrugated flexible metal tubingInfo
- Publication number
- CA1059837A CA1059837A CA319,357A CA319357A CA1059837A CA 1059837 A CA1059837 A CA 1059837A CA 319357 A CA319357 A CA 319357A CA 1059837 A CA1059837 A CA 1059837A
- Authority
- CA
- Canada
- Prior art keywords
- seam
- lock
- strip
- rollers
- forming
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Abstract of the Disclosure A readily adjustable machine which continuously produces corrugated flexible metal tubing from very light gauge metal and of various diameters. A warping ring receives there-within a longitudinally corrugated narrow strip of formable metal of light gauge and warps the same helically to produce convolutions by means of a helical warping surface which extends into one of the longitudinal corrugations. The size of the tube produced can be varied by merely substituting a warping ring of a different size. A uniquely shaped pair of die-forming rollers have lock-seam forming surfaces which are adjustable relative to each other to provide variation in the degree to which the seam will permit and withstand axial torque. The lock seam is constructed to be symmetrical about the neutral axis of the corrugation and about the slope line of the common corrugation leg of adjacent convolutions which it constitutes. The lock is provided by its radially extending deformations in its longitudinal medial portions and terminal portions, with intermediate portions therebetween extending at about 60 degrees thereto. The terminal portions extend around the bottoms of each of the U-shaped seam elements to further lock them in place. A flying saw automatically cuts off predetermined lengths of the tubing. The length of the sections to be cut may be varied by merely re-positioning a movable switch in the path of the tube. The tube has a unique lock-seam which is constructed to withstand greater flexing, greater axial twist and more stress without damage and without opening, and is stronger.
Description
~635~33~
Tllis invention relates to corrugated flexible cylind-rical ducts made Erom narrow strips of formable metal such as light gauge alumin-lm and so cons-tructed and axranged as to preclude separation of the adjacent convolutions of the metal strip as a result of either axial compression or tension.
The machine for making such ducts disclosed herein is character-ized by the absence of any mandrel, by the presence and usage of a warping ring for warping a strip in contiguous convolutions, ~`~
and by adjustable lock-seam forming rollers which form a uniquely shaped and cons-tructed lock seam as a common leg of a corrugation of contiguous convolutions of the strip. ;`
This application is a division of our co-pending application Serial No. 284,Q44, filed Augus-t 4, 1977 and entitled CORRUGATED FLEXIBLE METAL TUBING AND METHOD AND
APPARATUS FOR MAKING SAME, which application relates to an improvement on the invention described in United States Patent ' - ~, ' No. 3r982,414 issued on September 28, 1976 to Manufacturers ' Systems, Inc. and entitled MACHINE FOR ~KING CORRUGATED
FLEXIBLE CYLINDRICAL DUCT.
There is an industry recognized need ~or flexible metal ducts which oan be manufacturecl quickly and easily of very lightweight metal, such as aluminum of light gauge, and which can be bent about a sharp radius and/or, subjected to axial ~~ compression or tension without separation of the seam which i joins the contiguous convolutions of the strip. The flexible ~ -~
tubing disclosed herein has seam structure so constructed and l arranged as to permit flexing or bending about a smaller radius than there has heretofore been known and offers much greater resistance to separation at the seam under repeated flexing or other undue stresses.
It is recogni~ed in the industry that one of the serious proble~ns in the use of flexible c~lindrical tubing made of light~eight corrugated metal is the vulnerability of the tubing heretofore known to appreciable axial -tension and/or , .
~59~ 7 axiLIl compress.i.o~ ecause oE the lock seam construction discl.osecl and cla:ilnecl hel~cin, the f:lexible tubing manufactured in accordance with the di.sclosure of this application is highly desirable and much to be preferred over cons-truc-tions heretofore known.
It is a general object of our invention to provide a novel and improved machine for producing corrugated metal flexible tubing whieh can be quickly and easily modified to : produce tubing of different diameters. .
Another object is to provide a novel and improved maehine which can eontinuously produce flexible metal tubing and automatically cut the tubing into any desired leng~h as . it is produced.
:;~ Aeeording to the invention there is provided corrugated flexible eylindrieal duet-forming meehanism for produeing such duet from a flat narrow elongated strip of formable metal of small gauge comprising:-(a) a frame;
(b) rotatably mounted power roller means carried by said frame and constructed and arranged to die-form - longitudinally extending eorrugations in such a . .~
.- metal strip and to form oppositely extending side :
edge portions thereon as it passes therebetween ; (e) guide means carried by said frame and positioned ~ adjacent said roller means in metal strip-receiving :, relation thereto and being constructed and arranged ~ ~ .
. to preform for subsequent interlocking, such side ; .
edges of sueh strip into seam elements as it passes .
therethrough;
.(d) a pair of rotatably mounted powered rollers carried .:
: by said frame and positioned adjaeent said guide means in position to receive therebetween sueh a metal strip after it passes through said guide means and construc-ted and arranged to form the ~ .
~ 2 -~059l~3~7 : `:
opposit.ely loncJitudinally extending side edge ~
por-tions of such a strip into inboard and ou-tboard .:
seam elemen-ts extending generally at right angles ~ -to the general plane of the strip and in opposite .
directions; .
(e) a helically extending warping ring carried by said .
frame immedia-tely adjacent said seam element.forming rollers, said ring having a generally circular helically extending inner warping surface, the axis of which extends substan-tially parallel to the axis .
. of said seam element-forming rollers, said warping - `~
.. surfac,e having a leading portion and a trailing . `- -portion, said leading portion of said ring warping surEace being located ahead of said seam element~
.forming rollers in position to engage and extend `.; ~ :~
into the corrugation next to the inboard seam element of such a strip and positively direct the ~ ;
same within said ring along said helical warping surface to the said trailing portion of said inner ~ :
warping surface, said trailing portion of said inner warping surface terminating adjacent to and laterally outwardly of the outboard seam element of said strip ~ .
which has been so guided by said inner warping .
t surface into the outboard seam element of the strip in interengaging relation and thereby comple~e a .:
convolution of the strip, and (f) a pair of rotatably mounted lock-seam-forming rollers carried by said frame coaxially with said seam j element-forming rollers and outboardly thereof, said . 30 lock-seam-forming rollers having lock-seam-formincJ
.elements thereon positioned to engage such - interengaged seam elements and constructed and -.
-: . . , arranged to compress and deform the same into a lock-seam constituting a common leg of a corruga-tion .
~' .
, , ,,, ~059~37 for the colltiguous convolu-tions of the strip, at leas-t onc of said lock-seam-forming roll~rs being power driven.
In order that the invention may be readily understood one embodiment thereof will now be described by way of example with reference -to the accompanying drawings, wherein like reference characters refer to the same or similar parts throughout the several views, and in which~
Fig. 1 is a pictorial view of -the en-tire apparatus utilized in practicing our inventions;
Fig. 2 is a front elevational view of the roller mill ^~
portion of the apparatus shown in Fig. 1, with the adjacent protective side screen removed and the adjacent wall broken away; ~`
Fig. 3 is a top plan view of the roller mill shown in Fig. 2;
Fig. 4 is a schematic fragmentary sectional view taken at line 4--4 of Fig. 2 through the rollers which initially `;
engage the strip o~ metal and form the first corrugation therein;
Fig. 5 is a schematic fragmentary sectional view taken at line 5--5 of Fig. ~ through the second set of rollers ~;
which further deform the strip, as shown;
. ~
, - : -~5~ 37 li~icJ. 6 is a schematic ragmentary sectional vlew -taken at line 6--6 oE Fig. 2 throucJh the thircl set of rollers which further deform the strip, as shown;
Fig. 7 is a schematic fragmentary sectional view taken at line 7--7 of Fig. 2, through the fourth set of rollers which further deform the s-trip, as shown;
Fig. 8 is a schematic fragmentary sectional view taken at line 8--8 oE Fig. 2 through the fifth set of rollers which further deform the s-trip, as shown; ~ . -Fig. 9 is a schematic fragmen-tary sectional view taken at line 9--9 of Fig. 2 through the sixth set of rollers which further deform the strip, as shown;
Fig. 10 is a schematic fragmentary sectional view taken at line 10--10 of Fig. 2 through the seventh set of rollers -~
which further deform the strip, as shown;
`' Fig. 11 is a schematic fl-agmentary sectional view taken at line 11--11 of Fig. 2 through the eighth set of rollers which further deform the strip, as shown, to produce seam elements at ` either side oE the strip;
Fig. 12 lS a vertical sectional view taken on an enlaxged scale, at line 12--12 of Fig. 2 and showing the seam element forming rolls and the coaxial lock-seam forming rolls; ~;-: .
Fig. 13 is a fragmentary sectional view taken on a -~ -greatly enlarged scale of the encircled area of Fig. 12 to better illustrate the construction of the seam element forming ;
rolls and the lock-seam forming rolls, as well as the cross~
sectional construction of the lock-seam; I
Fig. 14 is a right side elevational view of the saw assembly of Fig. 1 with parts broken away, the saw being shown in tube-engaging position and the produced tube illustrated in phantom;
Fig. 15 is a vertical sec-tional view taken along line 15--15 of Fig. 14 with parts broken away and the saw in tube-cu-tting position;
' ' ' ' ' ' '' . ~
FicJ. L6 is a p:lall view of the saw and i-ts tiltable support, drive, and ret~lrn arm;
Fig. 17 is a rear encl elevational view oE the run-out table also shown in Fig. l; and Fig. 18 is a right side elevational view of the run-ou-t table taken along line 18--18 of Fig. 17.
As shown in Fig. 1, the corruga-ted flexible metal tubing is formed and cut in sections upon a machine consisting of a roller mill 20, an attached flying saw assembly 21, and a run-out table 22. The details of the roller mill 20 can best beseen by reference to Fig. 2 and 3 wherein there is shown a decoller 24 of a roll of a n~rrow s-trip of metal 25 of light gauge and readily deformable, such as aluminum. The machine shown is designed to fabricate tubing using 3003 aluminum, 0 temper. The gauge thickness is .0065 inches and the stock . .
width is 2.3125 inches. ;~
.
As the strip of metal 25 leaves the decoiler 24, it is fed through lubricating rolls which are a part of the decoiler.
These rolls place a thin Eilm of lub:ricant of the water based disappearing type upon both sides of the strip. As the strip 25 proceeds through the first se-t of rollers 26, the first ~ ~`
corrugation is formed adjacent the center of the strip as shown at 27 in Fig~ 4, the rollèrs 26 being shaped as shown therein to deform the metal in the manner shown in that figure.
As the strip 25 is driven through the next pair o~
` rollers 28, an additional deformation as shown at 29, in Fig.
5, is die-formed therein, the rollers having configurations as sho-~n thereinr to induce the corrugations as also sho~n.
Since both the upper and lower sets of rollers shown in Figs. 2 and 3 are driven, the strip 25 is readily progressed through the mill. As the strip is driven through the next pair of rollers 30, the deformations at 27 and 29 are made more pronounced, as shown in Fig. 6, and at either side of the corrugations 26 and 29, the strip 2S is additionally defor~ed :
as at 31 ancl al: 32 to commence the formation of two additional corr~gations. It wil.l be noted that the rollers 30 are so constructed as to comple~-e the corrugations 27 and 29 and at the .same time, initiate the formation of the two additional corrugations 31 and 32.
As the strip 25 moves through the rollers 33 as shown in Fig. 7, the corrugations at 27 and 29 are held to dimension, .
but the rollers 33 are so cons-tructed as to further deform the strip 25 at points 31 and 32 in order to complete the corruga-tions at those points and to further deform the strip as at 34 and 35 in opposite directions so as to initiate an ~ .
additional corrugation at either side of those already formed as hereinbefore described. ` .
:~ .
As the strip 25 progresses through the rollers 36, as :.
shown in Fig. 8I the corrugations formed at points 27, 29, 31, ~`
~ and.32 are held to dimension. The strip 25 is further deformed, .. however, at points 34 and 35 to complete the corrugations l thereat. In addition, the rollers 36 carry additional die- ~
.,' :
~¦ forming surfaces so as to further deform the strip 25 in ., .
opposite directions as at points 37 and 38 so as to initiate the formation o~ an additional corrugation, one each at opposite sides of those previously formed.
As the strip 25 enters the sixth pair of rollersr shown ~:
. in Fig. 7, the me-tal thereaf at the crest or bottoms of the ~:
corrugations, as thè case may be, at points 27, 29, 31, 32, ~4, ; : :
. and 35, are he.ld to dimension by the rollers 39. At points 37 ~, and 38, however, the strip is further deformed to complete the corrugations thereat. Outwardly of each of these points the rollers further deform the metal strip 25 in opposite directions ~:
as at 40 and 41. It will. be noted at this point in the :. deEorming process, the initial step i5 taken toward forming the side edge portions of the strip 25 into seam elements.
, As the strip 25 progresses through the seventh set of rollers, as shown in Fig. 10~ all o:E the corruga-tions are held - 7 ~
.
. ' ~ ' : ' ;~, ~S~3~7 to their. p:roper d:irnens:ions ~hile Eurther deEormation is appliecl by the rollcrs ~2 at -the right and -the rollers 43 a-t the left. Each oE these two pair of upper and lower rollers is mounted on tlle same shaft and is driven. The rollers 42 further deform the s-trip as at 44 -to shape -the inner leg of . :~
the seam element yet to be formed, while the rollers 43 shape the inner leg 45 of the outboard seam element ye-t to be fo.rmed.
~ As the strip 25 progresses through the eighth set of rollers as shown in Fig. 11, the second and outer leg of the two seam elements are formed. By reference to Fig. 11, it :~
will be seen that there are three sets of upper and lower :
rollers mounted on the same shaft, the central pair 46 serving to hold the corrugations to dimension, the inhoard set 47 serving to form the outer leg of the inboard seam element which .
faces downwardly and the outer pair of rollers 48 serving to control the inner leg of the upwardly facing outboard seam :
element to dimension and forming the outer leg thereof to ` e~tend upwardly to within 15~ of vertical, thereby providing .~ 20 most of the shape for that seam element. Thus, the .inner pair . . . .
of rollers 47 shape the strip 25 at point 49 to form the bot~om of the inboard seam while the outer pair of rollers 48 in ~:
cooperation with the central rollers 46 shape the bottom 50 of the upwardly facing outboard seam elements.
As the shaped strip 25 leaves the eighth set of rollers shown in Fig. 11, it passes between a pair of rollers 51 and 52, which are mounted on vertical axes and engage the opposite sides of the strip to bring the outer legs of the inboard and outboard seam element to a truly vertical position. These can :.-best be seen in Figs. 2 and 3. The function of these two small rollers is to complete the forming of the outer flanges of the -~.
strip.
As the strip 25 enters the final set of powered rollers, which are bes-t shown in E`igs. 12 and 13, it passes through a 8 _ .
1~59~ 7 central pair o~ rollers 53, which are mount~d upon a common sllaft with a pair 5~ oF inner, upper and lower rollers. All four of these rollers, shown in Fig. 2, are keyed to the shafts upon which they are mounted and are driven. Together, they hold the corrugations to dimension and ensure that the downwardly facing U-shaped inboard searn element has the proper shape. Mounted for free rotation upon the same shaft which carries the lower roller of each of the pairs 53 and 54 is a further rotatable lock-seam-forming roller 55. Cooperating therewith and mounted coaxially with the upper roller of each of the pairs 53 and 54 is an upper and vertically adjustable ~
lock-seam-forming roller 56. This lock-seam-forming roller ~ , , is driven by means of a pin 57 which is carried in a bore provided therefor in the outer surface of the upper roller 53 and extends into a radial slot formed on -the inner surface of ; the lock-seam-forming roller 56, the slot being of the same i width as the diameter of the pin 57 and slightly longer radially to permit very slight vertical movement of the roller 56 relative to the roller 55. This movement is controlled through an adjustable screw 58 which secures the mounting - bracket 59 which supports the stub shaft 60 upon which the lock-seam roller 56 is mounted. Thus, the lock-seam roller 56 is powered via the pin 57 while the lower lock-seam-forming rolLer55is not powered. The configuration of the die-forming surfaces of each of the rollers shown within the encircled area of Fig. 12 can best be seen and understood by reference to Fig.
- 13 wherein the downwardly facing inboard seam element 61 and the lock~seam 62 are clearly shown as formed by the seam element forming rollers and the lock-seam-forming rollers.
Fig. 2 shows each of the pairs of rollers described above rotatably moun-ted upon a movable frame F. A motor M
provides power via chaiil 63, which drives a sprocket 64, w}lich drives the shaf-t carrying the lower lock-seam-forming roller and a second sprocket 65 which is carried by the shaft mounting -- g _ 3~C3 S93337 the e.icJIlth pa:ir ol rol:l.er~, as shown in Fi.g. 2. Th:is sprocket 65 drives the sha~t 66, ~h:i.ch mounts the lower of -the rollers of this set and in turn d.rives eacll of the o-'her rollers of the first eight se-ts by means of a gear t~ain, such as ~.
indica-ted by the numeral 67 in r~'ig. 3, one each oE which is provided for each oE the upper and lower rollers. The shaft which carries the upper seam element forming rollers 53 and 54 ~
is driven by a pair of gears 68 and 69, as shown in Fig. 12. ~ .
As the strip 25 passes through the seam element forming rollers 53 and 54, it passes into a hellcally extending warping ring 70. This warping ring 70 is mounted upon a mountlng ring 71 which in turn is carried by a mounting block 72 which is secured by a pair of threaded mounting pins 73 and 74 which have knurled heads to facilitate tightening and secu.ring the mounting block in its proper position upon the Erame F. Tho mounting block 72 is provided with a centering bore 75 which receives the end of the spindle which carries the rollers 53 and 54 and functions as a centering pin. Thus, when desired, a different warping ring 70 having a different diameter may be quickly and easily substituted for one previously utilized on the machine. The warping ring 70 has a circular inner warping surface 76 which engages the second corrugation outwardly o~
the inboard seam element 61 as the strip leaves the seam element forming rollers 53 and 54. This warping surface extends into that corrugation and guides the strip 25 in a helical path ~ :`
., , :
outwardly within. the circular surface 76 until it reaches the point where the inboard seam element extends into and .
::
cooperatively engages the outboard seam element of the s-trip and enters the seam Eorming rollers 55 and 56 and is deformed thereby as shown in Fig. 13.
When the inboard seam elemen-t 61 has moved through the helical path and extends into the outboard seam element which faces upwardly, the ou-ter leg of each of the elements extends :
to the bottoln o~ the U-shaped struc-ture of the o-ther, as shown -.. : . . : .
~59837 .in Fig. 13. As they pacis thro~lgh the lock-seam-forminy rollers, the lock-seam 62 i.s formecl as a result of the compression which is appl:ied by the upper lock-seam-forming roller 56. As ind;cated hereinbeEore, this roller is vertically adjustable to a slight deyree so that the -compression applied to the two seam elements which become the : seam 62, can be varied as desired, to adjust the "slipability"
of the seam 62.
By reference to Fig. 13, the construc-tion of the lock-seam 6~ can best be appreciated. There it can be seen thatthe medial portions oE the two seam elements are deformed into .~ medial portion which extends radially of the helical tube which is formed by the adjacent convolutions of the strip 25.
It will be noted that the central and radially extending portion 76 of the lock-seam is symmetrically formed with respect to the neutral axis of the corrugation which has been identified by a broken line bearing the numeral 77. It is also :
constructed symmetrically with respect to the theoretical .~ center line of the corrugation leg which is comprised by the seam 62 and has been identified by the numeral 78. Thus, the intermediate and radially extending portion of the lock-seam is symmetrical with respect to each of these lines. Since the intersection of these lines is the point at which the minimum effect of flexing is felt and since the portion 76 extends radially, this construction provides maximum strength and least vulnerability to flexing.
It will be noted that the intermediate portions 79 and 80 of the lock-seam extend a-t approximately 60 to the radially extending medial portion 76 and in opposite.dlrecti.ons from ; 30 opposite ends thereof. This creates a 60 angle or crimp at each end of the radial section 76 and locks the interengaging legs oE the two seam elements together into an effective lock-seam. In addition, it will be noted that the inner leg of each of the seam elements is deformed so as to extend around the ,.
3LC~5~837 bottoln of th~ c~cljacen~ s~dm c-lement as at 81 and 82 to effectivel~ loc~i the two seam elements toqether at these addition~l points ~nd preclude relative shif-ting therebe-tween longitudinally of the seam element leys. Thus, the lock seam has a quadruple locking feature in that there are four separate points at which a locking action is provided, one each at each end of the radially extending por-tion 76 and one each at each of the terminal portions oE the seam indicated at numerals 81 and 82. It will be noted that the seam element extends along lO and is symmetrical with respect -to the slope line oE the corrugation leg which it comprises. This slope line has been , indicated by the numeral 83. It will also be noted that the lock seam constitutes a common leg of a corrugation of the ;~
adjacent convolutions of the strip 25.
FLYING SAW
Attached to the frame F and extending outwardly there-from at approximate right angles is a flying cut-off device which has been indicated generally by the numeral 85. This device consists of a frame 86 connected to the frame F in .' ~ :-~, .
Y 20 position to receive the helical tubular pipe which emanates from `~
the warping rin~ 70 toward the left as viewed in Fig. 3. `
:, ..
Mounted upon the frame 86 is a generally rectangular saw mounting frame 87. This frame 87 is tiltably mounted upon a shaft 88 upon the frame 86 and is nearly balanced with respect to its axis of pivot, there being a slight over-balance` in the direction of the saw 89, which is rotatably mounted upon a -~
rotatab3.e shaft 90 which is mounted for rota-tion about its longitudinal axis on the frame 87. The shaft 90 has a driving portion which is square in cross-section and upon which saw 89 , is slidably mounted so that it may shift along the length of the shaEt 90 while it is being rotated and driven by that shaft. The shaft 90 carries a pulley 91 at its outer end and a belt 92 extends therearound and around a drlve pulley 93, . ~ .
- 12 _ .~ ' .
. . . : . .
383~
whLch in turn is driverl by an electrical rnotor carricd by the Erame 87 at -the opL)osite side of the pivot shaft 88 with respect to the saw 39. ~s previously indicated, the over balance is in the direction of the saw so that normally the saw would tend to tilt downwardly to a limited extent and this downward tilt is aided by the urging of a light spring 9~
which is connec-ted to the frame 86 at one of its ends and to the frame 87 at its other end. Thus, the spring 94 and the over balance tend to urge the saw 89 to a retracted position which, as viewed in Fig. 15, would be lower than that actually shown and not in engagement with the metal tubing which has been shown in phantom and has been identified ~y the n~meral 95. The cut-off saw 89 is a conventional circular blade using fine tooth pitch and rotated at a speed sufficient to deliver a clean, burr-free edge.
Pivotally mounted upon frame 87 is a saw-returning arm 96. This arm;is constantly urged toward saw-returning position by a spring 97 and functions to return the saw 89 to its initial retracted position, shown in broken lines at the bottom o Fig. 16. In Fig. 16, the arm is shown in its retracted position after being drawn theretb prior to the initiation of a cut by a solenoid 98 which is activated by a microswitch which is released and moves to "closed" position when the saw support frame is rotated upwardly. Thus, as soon as the saw 89 is tilted upwardly, the return arm 96 is moved to its retracted posi~ion shown in Fig. 16 by the solenoid 98 and the saw 89 is free to move axially of the shaft 90 as it cuts the metal tu~ing and ~oves along therewith along the shaft 90.
The saw 89 is activated and tilted upwardly by a straight arm link 100 which is pivotally connected to the end of the frame 87 adjacent the saw 89 and extends downwardly therefrom to a point where it is pivo-tally connected to a 90 bell crank arm 101~ This bell crank arm 101 is pivotally _ 13 --:` . ' .' . ~ .
~Ci598~
IllOUrlteCI ~It 10~ U~OIl the ~r~me~ ~5 and its dependirlg arm is pivot~lly connecte(l a-t 103 to a link 104 ~hlch is connected to an ~lectrical soleno:id 105. Solenoid 105 has a built in stop which limits the inward movement of -the link 104 and, consequently, the upward tilting movement of the s~w 89 when the solenoid is activated.
As best shown in Fig. 15, a plurality of adjustable ; guide rollers 106, 107, 108 and 109 are mounted upon the frame 85 and are adjustable to be moved to desired positions necessary to guide the helical tubing 95 as it emanates rom the warping ring 70 through the warping ring mounting 71 at a slight angle (one degree to six degrees, depending upon the size of the tubing 95) to the axes of the seam~forminy rollers.
The shaft 90 and pivot 88 each extend parallel to the axis of the tube 95 as it emanates from the roller mill 20 and the axis of the shaft 90 is direc-tly therebelow in the same vertical ;
plane when it is elevatecl to cutting position, as shown in ~ ~
Fig. 15. Connected to the frame 85 is a runoff table indicated - ~ ~ -generally by -the numeral 110. This runoEf table 110 extends outwardly along the path of the pipe 95 as it emanates ~rom the roller mill 20 across the saw support table, or frame 87.
;~ As shown, it is provided with several pair of guiding rollers . . .
111, 112, and 113, 114. Mounted upon the runoff table 22 below one of the pair of rollers 111, 112 or 113, 114 (whichever is desired, depending upon the length of tube section to be cut) is a switch 115. This switch 115 is positioned so that it will ~e enc3aged and closed by the tubular member 95 as it rides outwardly on the rollers, such as 111, 112 It will be seen that the switch is positioned between the rollers and slightly ;~
therebelow. This switch is connected with the saw motor and when activated, causes the saw to commence to ro-tate.
A second switch 116 is located somewhat outwardly of the saw activating switch 115 and is similarly positioned to be enc3aged by the tubular member 95. When it is engac;ed by the tubular mernber 95, it ac-tivates the solenoid 105 and causes - 14 ~
.
~5~ 7 thc~ saw 89 -to ~>e til~ed upwardly to the cutting position shown in Fig. 15, it having been retracted heretofore and clcarecl by the pipe 95 as it moved across the saw assembly table. Activation of -the solenoid 105 brings the saw 89 upwardly into engagemen-t with the lower surface of the tubular member 95 and to a level, as shown in Fig. 15, of approximately 3/4" into the interior of the tubular member.
Since the tubular member is rotating rapidly, the rapidly rotating saw will quickly cut a section oEf the end of the tube and while doing so, the saw member 89 will slidahly move along its square driving shaft 90 with the tubular member 95 and will soon complete the cut to free the desired section.
~; At the same instant that the saw support frame is rotated for engaging the saw blade with the pipe, or tube/
the solenoid 98 is activated by the switch 116 to draw the return arm 96 to its position as shown in Fig. 16 so as to free `, the saW so as to permit it to slide along the shaft 90 as it is rotati~g. When the cut has been cornpleted, the operator merely ;~ operates the dump lever 117 on the runoff table which causes the cut section oE pipe to be lifted vertically and longitudin-ally, thereby clearing the end of the pipe which continues to emanate from the roller mill 20. When this occurs, the switches 115 and 116 are freed, which cuts off the power to the saw 89 and also to the solenoid 105. This permits the frame 87 to tilt back to retracted position, this function being aided by the spring 94 and the saw is permitted to cease rotating. When the frame 87 reaches its lowermost position, it engages the microswitch 99, which cuts off the power to the solenoid 98, and as a conse~uence, the return arm 96 returns the saw 89 to 3~ its retracted position, as shown at the bottom of FigO 16 in broken lines. It will be seen that the runoff table 22 is provided with a plurality of pivotally mounted ejection arms 118, 119, 120 and 121. These are pivotally mounted upon the frame of the runoff table and when the dump crank 117 is _ 15 _ . . . . . . .
,' : :, : :
9~33~
opcratecl, tlley swing up~ar~lly -to the position shown in Fig.
18, with a result that the cut section will be moved away from the saw assembly and will be projected away from the operator of the crank 117, as a result of the upwardly and inwardly curved projection arms 122 and 123.
In operation, the narrow strip of me-tal 25 passes through the first eight sets of rollers, the cross-sectiona~
configuration of which can bes-t be seen in Figs. 4-11, inclusive, to form the longitudinal corrugations in the strip center line is subjected to an absolute minimum of stress resulting from the flexing ac-tion. ~;
The action ]ust described with respect to the Eormation `
of the lock-seam 62 continues to cause the contiguous `
convolutions of the st~ip to continuously form into a helicall~
.
constructed tubular member which emanates from the roller mill 20 at a slight angle to the axis of the lock-seam-formin~
rollers.
As the tubular member 95 emanates from the roller mill ; 20, it passes outwardly over the flying saw support table and physically clears the same since the saw and saw support are in retracted position. The saw at this point is inactivated and, consequently, the tubular member passes out to the runout table long rollers 111 and 112 and enga~es the switch 115. When the end of the tubular member depresses switch 115, this closes the circui* to the saw motor and the saw commences to rotate rapidly. When the end of the tubular member engages the switch 116, this activates the solenoid member 105 and, consequently, the saw support Erame 87 and the saw 89 pivot upwardly above the shaft 88 until the rapidly rotating saw engages and cuts - -~30 the lower side of the tube ~5. Since the tube is rotating about its longitudinal axis, the saw needs to only travel with the tube sufficiently long for the tubular member to make one rotation about its longitudinal axis, at which time the cut will be completed.
~ t the same tirne as the sol.enoid 105 is activated, the upwarcl movemerlt o.E the :Erclme 87 permlts microswitch 99 to move to "closed" position and this act:ivates the solenoid 98 which draws the saw re~urn arm to its retrac-ted position, as shown ln Fig. 1~. This permits the saw 89 to shift longitud-inally of its driving shaf-t '~0 so that it may move along with the tubular member 95 so long as is requi.red.
When the cut has been completed, the operator merely operates the crank 117 to lift the cut section away from the saw and discharge it laterally. This frees each of the switches, 115 and 116 with the result that the solenoid 105 becomes de-activated and the spring 94 draws the saw 89 downwardly to retracted position, the ~rame 87 thereby engaging microswitch 99 and moving it to "open" position to deactivate electrical solenoid 98 whereupon return arm 96 will cause the saw 89 to .
slide longitudinally of the shaEt 90 back to its initial start-ing position. The saw, meanwhile, will have rotated to a stop and the entire mechanism is ready for ~he next cut. .
` The principal advantages of our invention are provided as a result of the unique geometry and construction of the lock- ~ :
seam, which is provided. We have founcl that this lock-seam has greater strength, provides greater flexibility, and also .
provides "slipability" where desired. ~ince the lock-seam has four separate lock points, it provides much better resistance against possible opening of the seam which normally results in Qther seams from repeated flexing or excessive flexing, or axial torque. In addition to the fact that four separate lock points are provided in our lock seam, its location and :~ arrangement is unique and provides added strength, versatillty, and capability with respect to repeated flexing, excessive flexing and/or the application of radial torque.
~ s can best be seen by reference to Fig. 13, our lock-seam extends along the slope of the common leg of a corrugation of the contiguous convolutions of the strip in the tuhe and - 17 _ 5g~3 ~ :
thu~; it or.fcrs .1 rninilllum res-ista!lcc? to f:Le~xing since i-t will fold entirely within the corrugation iE the flexing is made toward the seam. If it is mac~e away from the seam, -the unique quadruple locking points provide a maximum oE resistance against openincJ of the seam. Moreover, since it is located on .. :
the neutral axis, which by definition, is a line along which the minimum stress is applied, a locX-seam is better able to withstand such stresses merely because of its location and arrangement alone. Moreover, it is symmetrically disposed with - :~
respect to the neutral axis and also with respect to the theoretical center line of the corrugation. It is also ;~
symmetrically disposed with respect to the slope line of the ~ ~
corrugation. Since it extends along the slope line of the - ~-corrugation,.it does not tend to fight normal flexing, as i5 ; the case with seams which are otherwise located. If the flexing is toward the seam, there is no stress upon the seam whatever because of its unique location and disposition and , .
if the tube is flexed sufficiently far, the seam will disappear entirely within the corrugation and offer no resistance to ~0 flexing. As a consequence, it is possible to flex a tube made in accordance with our invention about a diameter that represents as little as 33 per cent of the pipe diameter whereas most pipe heretofore known with other types of seams cannot be bent about -a diameter which is much less than the complete diameter of the pipe. Thus it can be seen that we have provided a marked improvement in the capabilities of such a corrugated tuhe. .~ -~.
.i We have found that with our quadruple lock-seam, a pipe :. .
. utilizing such lock seams permits the pipe to be flexed numerous :. . .
times and we find that the bends and depressions of the four 30 locks provided by our lock-seam prevent the join-t from leaking ~ :
as a result of excessive bending.
Another added fea-ture of our lock-seam is its versatility.
It is possible through the use oE our lock-seam to provide a pipe whi.ch will read:ily permit the appli.cation of axial torque -- 1 ~3 -- ' .. , ', ' '', ' ', . ,.,'' ,' ~' ' ,,- ' ' :- ~ ' 1~ 837 ithout any serious consequences to the seam. Since the extent of compression is reduced by adjusting the position of the upper lock-seam roller 56, a tube can be produced which will permit substantial radial torque to be applied with resultant "slipability" being provided. By "slipability", we refer to the ability of the -tube to be twisted about its longitudinal axis without causing leakage or separating in the ~ `
seams.
~ne of the advantages of our invention is that it is ; 10 possible to manufacture relatively strong corrugated tubing from relatively light and inexpensive metal, such as light gauge aluminum. Moreover, it is possible to produce such tubing in relatively high speeds so that the cost of the same is substantially reduced. With the machine disclosed and claimed herein, for example, the strip speed entering the roll at the points shGwn in Figs. 12 and 13 is 1~0 f.p.m. and helical tubes can be made at the rate of 18 f.p.m. for a 3"
diameter tube. A 12" diameter tube can be made as rapidly as 4-1/2 f.p.m. Thus, it can be seen that we have provided a highly efficient apparatus and method for manufacturing ; ïmproved corrugated tubing.
As noted hereinbefore, the methods which we utili~e provide the necessary longitudinal corrugations in the strip 25 with a minimum of hardening and, conse~uently, the resultant tubing has marked strength when the nature of the light gauge metal which is utilized is considered. The design of our seam or its geometry minimizes the adverse effects of flexing upon ~ -a tube made in accordance with our invention. Since it is . :
- symmetrically arranged with respect to the neutral axis of the corrugation, there is a minimum adverse stress placed upon the seam during repeated flexing and since the seam ex-tends along the slope oE the corrugation leg, there is an absolute minlmum adverse efEect upon the seam when the tube is flexed. No o-ther corruyated tubular members, to our ]~nowledge, have been .~ - .
_ l9 _ , ' ' : . ;
,, ~
~1~59~33'7 hereto~orc~ so ~lesicJned as to take max:imum advantage o~ the fact that minirnum stress is located along the neutral axis of the corrugation ancl upon the seam which cons-ti-tutes a common ~ -ley of a corrugation of contiguous convolutions. We have found that extended flexibility and -the "slipability" of our ; tubes do not inhibit -their ability to main-tain a minimum pressure (6" W.C.) or vacuum (6" W.C.). Our pipe can take velocities in excess of 6000 f.p.m.
It will, of course, be understood that various changes may be made in the form, details, arrangement and prOpOr-tiQns of the parts without departing from the scope of our inven-tion which consists of the matter shown and described herein and set forth in the appended claims.
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Tllis invention relates to corrugated flexible cylind-rical ducts made Erom narrow strips of formable metal such as light gauge alumin-lm and so cons-tructed and axranged as to preclude separation of the adjacent convolutions of the metal strip as a result of either axial compression or tension.
The machine for making such ducts disclosed herein is character-ized by the absence of any mandrel, by the presence and usage of a warping ring for warping a strip in contiguous convolutions, ~`~
and by adjustable lock-seam forming rollers which form a uniquely shaped and cons-tructed lock seam as a common leg of a corrugation of contiguous convolutions of the strip. ;`
This application is a division of our co-pending application Serial No. 284,Q44, filed Augus-t 4, 1977 and entitled CORRUGATED FLEXIBLE METAL TUBING AND METHOD AND
APPARATUS FOR MAKING SAME, which application relates to an improvement on the invention described in United States Patent ' - ~, ' No. 3r982,414 issued on September 28, 1976 to Manufacturers ' Systems, Inc. and entitled MACHINE FOR ~KING CORRUGATED
FLEXIBLE CYLINDRICAL DUCT.
There is an industry recognized need ~or flexible metal ducts which oan be manufacturecl quickly and easily of very lightweight metal, such as aluminum of light gauge, and which can be bent about a sharp radius and/or, subjected to axial ~~ compression or tension without separation of the seam which i joins the contiguous convolutions of the strip. The flexible ~ -~
tubing disclosed herein has seam structure so constructed and l arranged as to permit flexing or bending about a smaller radius than there has heretofore been known and offers much greater resistance to separation at the seam under repeated flexing or other undue stresses.
It is recogni~ed in the industry that one of the serious proble~ns in the use of flexible c~lindrical tubing made of light~eight corrugated metal is the vulnerability of the tubing heretofore known to appreciable axial -tension and/or , .
~59~ 7 axiLIl compress.i.o~ ecause oE the lock seam construction discl.osecl and cla:ilnecl hel~cin, the f:lexible tubing manufactured in accordance with the di.sclosure of this application is highly desirable and much to be preferred over cons-truc-tions heretofore known.
It is a general object of our invention to provide a novel and improved machine for producing corrugated metal flexible tubing whieh can be quickly and easily modified to : produce tubing of different diameters. .
Another object is to provide a novel and improved maehine which can eontinuously produce flexible metal tubing and automatically cut the tubing into any desired leng~h as . it is produced.
:;~ Aeeording to the invention there is provided corrugated flexible eylindrieal duet-forming meehanism for produeing such duet from a flat narrow elongated strip of formable metal of small gauge comprising:-(a) a frame;
(b) rotatably mounted power roller means carried by said frame and constructed and arranged to die-form - longitudinally extending eorrugations in such a . .~
.- metal strip and to form oppositely extending side :
edge portions thereon as it passes therebetween ; (e) guide means carried by said frame and positioned ~ adjacent said roller means in metal strip-receiving :, relation thereto and being constructed and arranged ~ ~ .
. to preform for subsequent interlocking, such side ; .
edges of sueh strip into seam elements as it passes .
therethrough;
.(d) a pair of rotatably mounted powered rollers carried .:
: by said frame and positioned adjaeent said guide means in position to receive therebetween sueh a metal strip after it passes through said guide means and construc-ted and arranged to form the ~ .
~ 2 -~059l~3~7 : `:
opposit.ely loncJitudinally extending side edge ~
por-tions of such a strip into inboard and ou-tboard .:
seam elemen-ts extending generally at right angles ~ -to the general plane of the strip and in opposite .
directions; .
(e) a helically extending warping ring carried by said .
frame immedia-tely adjacent said seam element.forming rollers, said ring having a generally circular helically extending inner warping surface, the axis of which extends substan-tially parallel to the axis .
. of said seam element-forming rollers, said warping - `~
.. surfac,e having a leading portion and a trailing . `- -portion, said leading portion of said ring warping surEace being located ahead of said seam element~
.forming rollers in position to engage and extend `.; ~ :~
into the corrugation next to the inboard seam element of such a strip and positively direct the ~ ;
same within said ring along said helical warping surface to the said trailing portion of said inner ~ :
warping surface, said trailing portion of said inner warping surface terminating adjacent to and laterally outwardly of the outboard seam element of said strip ~ .
which has been so guided by said inner warping .
t surface into the outboard seam element of the strip in interengaging relation and thereby comple~e a .:
convolution of the strip, and (f) a pair of rotatably mounted lock-seam-forming rollers carried by said frame coaxially with said seam j element-forming rollers and outboardly thereof, said . 30 lock-seam-forming rollers having lock-seam-formincJ
.elements thereon positioned to engage such - interengaged seam elements and constructed and -.
-: . . , arranged to compress and deform the same into a lock-seam constituting a common leg of a corruga-tion .
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, , ,,, ~059~37 for the colltiguous convolu-tions of the strip, at leas-t onc of said lock-seam-forming roll~rs being power driven.
In order that the invention may be readily understood one embodiment thereof will now be described by way of example with reference -to the accompanying drawings, wherein like reference characters refer to the same or similar parts throughout the several views, and in which~
Fig. 1 is a pictorial view of -the en-tire apparatus utilized in practicing our inventions;
Fig. 2 is a front elevational view of the roller mill ^~
portion of the apparatus shown in Fig. 1, with the adjacent protective side screen removed and the adjacent wall broken away; ~`
Fig. 3 is a top plan view of the roller mill shown in Fig. 2;
Fig. 4 is a schematic fragmentary sectional view taken at line 4--4 of Fig. 2 through the rollers which initially `;
engage the strip o~ metal and form the first corrugation therein;
Fig. 5 is a schematic fragmentary sectional view taken at line 5--5 of Fig. ~ through the second set of rollers ~;
which further deform the strip, as shown;
. ~
, - : -~5~ 37 li~icJ. 6 is a schematic ragmentary sectional vlew -taken at line 6--6 oE Fig. 2 throucJh the thircl set of rollers which further deform the strip, as shown;
Fig. 7 is a schematic fragmentary sectional view taken at line 7--7 of Fig. 2, through the fourth set of rollers which further deform the s-trip, as shown;
Fig. 8 is a schematic fragmentary sectional view taken at line 8--8 oE Fig. 2 through the fifth set of rollers which further deform the s-trip, as shown; ~ . -Fig. 9 is a schematic fragmen-tary sectional view taken at line 9--9 of Fig. 2 through the sixth set of rollers which further deform the strip, as shown;
Fig. 10 is a schematic fragmentary sectional view taken at line 10--10 of Fig. 2 through the seventh set of rollers -~
which further deform the strip, as shown;
`' Fig. 11 is a schematic fl-agmentary sectional view taken at line 11--11 of Fig. 2 through the eighth set of rollers which further deform the strip, as shown, to produce seam elements at ` either side oE the strip;
Fig. 12 lS a vertical sectional view taken on an enlaxged scale, at line 12--12 of Fig. 2 and showing the seam element forming rolls and the coaxial lock-seam forming rolls; ~;-: .
Fig. 13 is a fragmentary sectional view taken on a -~ -greatly enlarged scale of the encircled area of Fig. 12 to better illustrate the construction of the seam element forming ;
rolls and the lock-seam forming rolls, as well as the cross~
sectional construction of the lock-seam; I
Fig. 14 is a right side elevational view of the saw assembly of Fig. 1 with parts broken away, the saw being shown in tube-engaging position and the produced tube illustrated in phantom;
Fig. 15 is a vertical sec-tional view taken along line 15--15 of Fig. 14 with parts broken away and the saw in tube-cu-tting position;
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FicJ. L6 is a p:lall view of the saw and i-ts tiltable support, drive, and ret~lrn arm;
Fig. 17 is a rear encl elevational view oE the run-out table also shown in Fig. l; and Fig. 18 is a right side elevational view of the run-ou-t table taken along line 18--18 of Fig. 17.
As shown in Fig. 1, the corruga-ted flexible metal tubing is formed and cut in sections upon a machine consisting of a roller mill 20, an attached flying saw assembly 21, and a run-out table 22. The details of the roller mill 20 can best beseen by reference to Fig. 2 and 3 wherein there is shown a decoller 24 of a roll of a n~rrow s-trip of metal 25 of light gauge and readily deformable, such as aluminum. The machine shown is designed to fabricate tubing using 3003 aluminum, 0 temper. The gauge thickness is .0065 inches and the stock . .
width is 2.3125 inches. ;~
.
As the strip of metal 25 leaves the decoiler 24, it is fed through lubricating rolls which are a part of the decoiler.
These rolls place a thin Eilm of lub:ricant of the water based disappearing type upon both sides of the strip. As the strip 25 proceeds through the first se-t of rollers 26, the first ~ ~`
corrugation is formed adjacent the center of the strip as shown at 27 in Fig~ 4, the rollèrs 26 being shaped as shown therein to deform the metal in the manner shown in that figure.
As the strip 25 is driven through the next pair o~
` rollers 28, an additional deformation as shown at 29, in Fig.
5, is die-formed therein, the rollers having configurations as sho-~n thereinr to induce the corrugations as also sho~n.
Since both the upper and lower sets of rollers shown in Figs. 2 and 3 are driven, the strip 25 is readily progressed through the mill. As the strip is driven through the next pair of rollers 30, the deformations at 27 and 29 are made more pronounced, as shown in Fig. 6, and at either side of the corrugations 26 and 29, the strip 2S is additionally defor~ed :
as at 31 ancl al: 32 to commence the formation of two additional corr~gations. It wil.l be noted that the rollers 30 are so constructed as to comple~-e the corrugations 27 and 29 and at the .same time, initiate the formation of the two additional corrugations 31 and 32.
As the strip 25 moves through the rollers 33 as shown in Fig. 7, the corrugations at 27 and 29 are held to dimension, .
but the rollers 33 are so cons-tructed as to further deform the strip 25 at points 31 and 32 in order to complete the corruga-tions at those points and to further deform the strip as at 34 and 35 in opposite directions so as to initiate an ~ .
additional corrugation at either side of those already formed as hereinbefore described. ` .
:~ .
As the strip 25 progresses through the rollers 36, as :.
shown in Fig. 8I the corrugations formed at points 27, 29, 31, ~`
~ and.32 are held to dimension. The strip 25 is further deformed, .. however, at points 34 and 35 to complete the corrugations l thereat. In addition, the rollers 36 carry additional die- ~
.,' :
~¦ forming surfaces so as to further deform the strip 25 in ., .
opposite directions as at points 37 and 38 so as to initiate the formation o~ an additional corrugation, one each at opposite sides of those previously formed.
As the strip 25 enters the sixth pair of rollersr shown ~:
. in Fig. 7, the me-tal thereaf at the crest or bottoms of the ~:
corrugations, as thè case may be, at points 27, 29, 31, 32, ~4, ; : :
. and 35, are he.ld to dimension by the rollers 39. At points 37 ~, and 38, however, the strip is further deformed to complete the corrugations thereat. Outwardly of each of these points the rollers further deform the metal strip 25 in opposite directions ~:
as at 40 and 41. It will. be noted at this point in the :. deEorming process, the initial step i5 taken toward forming the side edge portions of the strip 25 into seam elements.
, As the strip 25 progresses through the seventh set of rollers, as shown in Fig. 10~ all o:E the corruga-tions are held - 7 ~
.
. ' ~ ' : ' ;~, ~S~3~7 to their. p:roper d:irnens:ions ~hile Eurther deEormation is appliecl by the rollcrs ~2 at -the right and -the rollers 43 a-t the left. Each oE these two pair of upper and lower rollers is mounted on tlle same shaft and is driven. The rollers 42 further deform the s-trip as at 44 -to shape -the inner leg of . :~
the seam element yet to be formed, while the rollers 43 shape the inner leg 45 of the outboard seam element ye-t to be fo.rmed.
~ As the strip 25 progresses through the eighth set of rollers as shown in Fig. 11, the second and outer leg of the two seam elements are formed. By reference to Fig. 11, it :~
will be seen that there are three sets of upper and lower :
rollers mounted on the same shaft, the central pair 46 serving to hold the corrugations to dimension, the inhoard set 47 serving to form the outer leg of the inboard seam element which .
faces downwardly and the outer pair of rollers 48 serving to control the inner leg of the upwardly facing outboard seam :
element to dimension and forming the outer leg thereof to ` e~tend upwardly to within 15~ of vertical, thereby providing .~ 20 most of the shape for that seam element. Thus, the .inner pair . . . .
of rollers 47 shape the strip 25 at point 49 to form the bot~om of the inboard seam while the outer pair of rollers 48 in ~:
cooperation with the central rollers 46 shape the bottom 50 of the upwardly facing outboard seam elements.
As the shaped strip 25 leaves the eighth set of rollers shown in Fig. 11, it passes between a pair of rollers 51 and 52, which are mounted on vertical axes and engage the opposite sides of the strip to bring the outer legs of the inboard and outboard seam element to a truly vertical position. These can :.-best be seen in Figs. 2 and 3. The function of these two small rollers is to complete the forming of the outer flanges of the -~.
strip.
As the strip 25 enters the final set of powered rollers, which are bes-t shown in E`igs. 12 and 13, it passes through a 8 _ .
1~59~ 7 central pair o~ rollers 53, which are mount~d upon a common sllaft with a pair 5~ oF inner, upper and lower rollers. All four of these rollers, shown in Fig. 2, are keyed to the shafts upon which they are mounted and are driven. Together, they hold the corrugations to dimension and ensure that the downwardly facing U-shaped inboard searn element has the proper shape. Mounted for free rotation upon the same shaft which carries the lower roller of each of the pairs 53 and 54 is a further rotatable lock-seam-forming roller 55. Cooperating therewith and mounted coaxially with the upper roller of each of the pairs 53 and 54 is an upper and vertically adjustable ~
lock-seam-forming roller 56. This lock-seam-forming roller ~ , , is driven by means of a pin 57 which is carried in a bore provided therefor in the outer surface of the upper roller 53 and extends into a radial slot formed on -the inner surface of ; the lock-seam-forming roller 56, the slot being of the same i width as the diameter of the pin 57 and slightly longer radially to permit very slight vertical movement of the roller 56 relative to the roller 55. This movement is controlled through an adjustable screw 58 which secures the mounting - bracket 59 which supports the stub shaft 60 upon which the lock-seam roller 56 is mounted. Thus, the lock-seam roller 56 is powered via the pin 57 while the lower lock-seam-forming rolLer55is not powered. The configuration of the die-forming surfaces of each of the rollers shown within the encircled area of Fig. 12 can best be seen and understood by reference to Fig.
- 13 wherein the downwardly facing inboard seam element 61 and the lock~seam 62 are clearly shown as formed by the seam element forming rollers and the lock-seam-forming rollers.
Fig. 2 shows each of the pairs of rollers described above rotatably moun-ted upon a movable frame F. A motor M
provides power via chaiil 63, which drives a sprocket 64, w}lich drives the shaf-t carrying the lower lock-seam-forming roller and a second sprocket 65 which is carried by the shaft mounting -- g _ 3~C3 S93337 the e.icJIlth pa:ir ol rol:l.er~, as shown in Fi.g. 2. Th:is sprocket 65 drives the sha~t 66, ~h:i.ch mounts the lower of -the rollers of this set and in turn d.rives eacll of the o-'her rollers of the first eight se-ts by means of a gear t~ain, such as ~.
indica-ted by the numeral 67 in r~'ig. 3, one each oE which is provided for each oE the upper and lower rollers. The shaft which carries the upper seam element forming rollers 53 and 54 ~
is driven by a pair of gears 68 and 69, as shown in Fig. 12. ~ .
As the strip 25 passes through the seam element forming rollers 53 and 54, it passes into a hellcally extending warping ring 70. This warping ring 70 is mounted upon a mountlng ring 71 which in turn is carried by a mounting block 72 which is secured by a pair of threaded mounting pins 73 and 74 which have knurled heads to facilitate tightening and secu.ring the mounting block in its proper position upon the Erame F. Tho mounting block 72 is provided with a centering bore 75 which receives the end of the spindle which carries the rollers 53 and 54 and functions as a centering pin. Thus, when desired, a different warping ring 70 having a different diameter may be quickly and easily substituted for one previously utilized on the machine. The warping ring 70 has a circular inner warping surface 76 which engages the second corrugation outwardly o~
the inboard seam element 61 as the strip leaves the seam element forming rollers 53 and 54. This warping surface extends into that corrugation and guides the strip 25 in a helical path ~ :`
., , :
outwardly within. the circular surface 76 until it reaches the point where the inboard seam element extends into and .
::
cooperatively engages the outboard seam element of the s-trip and enters the seam Eorming rollers 55 and 56 and is deformed thereby as shown in Fig. 13.
When the inboard seam elemen-t 61 has moved through the helical path and extends into the outboard seam element which faces upwardly, the ou-ter leg of each of the elements extends :
to the bottoln o~ the U-shaped struc-ture of the o-ther, as shown -.. : . . : .
~59837 .in Fig. 13. As they pacis thro~lgh the lock-seam-forminy rollers, the lock-seam 62 i.s formecl as a result of the compression which is appl:ied by the upper lock-seam-forming roller 56. As ind;cated hereinbeEore, this roller is vertically adjustable to a slight deyree so that the -compression applied to the two seam elements which become the : seam 62, can be varied as desired, to adjust the "slipability"
of the seam 62.
By reference to Fig. 13, the construc-tion of the lock-seam 6~ can best be appreciated. There it can be seen thatthe medial portions oE the two seam elements are deformed into .~ medial portion which extends radially of the helical tube which is formed by the adjacent convolutions of the strip 25.
It will be noted that the central and radially extending portion 76 of the lock-seam is symmetrically formed with respect to the neutral axis of the corrugation which has been identified by a broken line bearing the numeral 77. It is also :
constructed symmetrically with respect to the theoretical .~ center line of the corrugation leg which is comprised by the seam 62 and has been identified by the numeral 78. Thus, the intermediate and radially extending portion of the lock-seam is symmetrical with respect to each of these lines. Since the intersection of these lines is the point at which the minimum effect of flexing is felt and since the portion 76 extends radially, this construction provides maximum strength and least vulnerability to flexing.
It will be noted that the intermediate portions 79 and 80 of the lock-seam extend a-t approximately 60 to the radially extending medial portion 76 and in opposite.dlrecti.ons from ; 30 opposite ends thereof. This creates a 60 angle or crimp at each end of the radial section 76 and locks the interengaging legs oE the two seam elements together into an effective lock-seam. In addition, it will be noted that the inner leg of each of the seam elements is deformed so as to extend around the ,.
3LC~5~837 bottoln of th~ c~cljacen~ s~dm c-lement as at 81 and 82 to effectivel~ loc~i the two seam elements toqether at these addition~l points ~nd preclude relative shif-ting therebe-tween longitudinally of the seam element leys. Thus, the lock seam has a quadruple locking feature in that there are four separate points at which a locking action is provided, one each at each end of the radially extending por-tion 76 and one each at each of the terminal portions oE the seam indicated at numerals 81 and 82. It will be noted that the seam element extends along lO and is symmetrical with respect -to the slope line oE the corrugation leg which it comprises. This slope line has been , indicated by the numeral 83. It will also be noted that the lock seam constitutes a common leg of a corrugation of the ;~
adjacent convolutions of the strip 25.
FLYING SAW
Attached to the frame F and extending outwardly there-from at approximate right angles is a flying cut-off device which has been indicated generally by the numeral 85. This device consists of a frame 86 connected to the frame F in .' ~ :-~, .
Y 20 position to receive the helical tubular pipe which emanates from `~
the warping rin~ 70 toward the left as viewed in Fig. 3. `
:, ..
Mounted upon the frame 86 is a generally rectangular saw mounting frame 87. This frame 87 is tiltably mounted upon a shaft 88 upon the frame 86 and is nearly balanced with respect to its axis of pivot, there being a slight over-balance` in the direction of the saw 89, which is rotatably mounted upon a -~
rotatab3.e shaft 90 which is mounted for rota-tion about its longitudinal axis on the frame 87. The shaft 90 has a driving portion which is square in cross-section and upon which saw 89 , is slidably mounted so that it may shift along the length of the shaEt 90 while it is being rotated and driven by that shaft. The shaft 90 carries a pulley 91 at its outer end and a belt 92 extends therearound and around a drlve pulley 93, . ~ .
- 12 _ .~ ' .
. . . : . .
383~
whLch in turn is driverl by an electrical rnotor carricd by the Erame 87 at -the opL)osite side of the pivot shaft 88 with respect to the saw 39. ~s previously indicated, the over balance is in the direction of the saw so that normally the saw would tend to tilt downwardly to a limited extent and this downward tilt is aided by the urging of a light spring 9~
which is connec-ted to the frame 86 at one of its ends and to the frame 87 at its other end. Thus, the spring 94 and the over balance tend to urge the saw 89 to a retracted position which, as viewed in Fig. 15, would be lower than that actually shown and not in engagement with the metal tubing which has been shown in phantom and has been identified ~y the n~meral 95. The cut-off saw 89 is a conventional circular blade using fine tooth pitch and rotated at a speed sufficient to deliver a clean, burr-free edge.
Pivotally mounted upon frame 87 is a saw-returning arm 96. This arm;is constantly urged toward saw-returning position by a spring 97 and functions to return the saw 89 to its initial retracted position, shown in broken lines at the bottom o Fig. 16. In Fig. 16, the arm is shown in its retracted position after being drawn theretb prior to the initiation of a cut by a solenoid 98 which is activated by a microswitch which is released and moves to "closed" position when the saw support frame is rotated upwardly. Thus, as soon as the saw 89 is tilted upwardly, the return arm 96 is moved to its retracted posi~ion shown in Fig. 16 by the solenoid 98 and the saw 89 is free to move axially of the shaft 90 as it cuts the metal tu~ing and ~oves along therewith along the shaft 90.
The saw 89 is activated and tilted upwardly by a straight arm link 100 which is pivotally connected to the end of the frame 87 adjacent the saw 89 and extends downwardly therefrom to a point where it is pivo-tally connected to a 90 bell crank arm 101~ This bell crank arm 101 is pivotally _ 13 --:` . ' .' . ~ .
~Ci598~
IllOUrlteCI ~It 10~ U~OIl the ~r~me~ ~5 and its dependirlg arm is pivot~lly connecte(l a-t 103 to a link 104 ~hlch is connected to an ~lectrical soleno:id 105. Solenoid 105 has a built in stop which limits the inward movement of -the link 104 and, consequently, the upward tilting movement of the s~w 89 when the solenoid is activated.
As best shown in Fig. 15, a plurality of adjustable ; guide rollers 106, 107, 108 and 109 are mounted upon the frame 85 and are adjustable to be moved to desired positions necessary to guide the helical tubing 95 as it emanates rom the warping ring 70 through the warping ring mounting 71 at a slight angle (one degree to six degrees, depending upon the size of the tubing 95) to the axes of the seam~forminy rollers.
The shaft 90 and pivot 88 each extend parallel to the axis of the tube 95 as it emanates from the roller mill 20 and the axis of the shaft 90 is direc-tly therebelow in the same vertical ;
plane when it is elevatecl to cutting position, as shown in ~ ~
Fig. 15. Connected to the frame 85 is a runoff table indicated - ~ ~ -generally by -the numeral 110. This runoEf table 110 extends outwardly along the path of the pipe 95 as it emanates ~rom the roller mill 20 across the saw support table, or frame 87.
;~ As shown, it is provided with several pair of guiding rollers . . .
111, 112, and 113, 114. Mounted upon the runoff table 22 below one of the pair of rollers 111, 112 or 113, 114 (whichever is desired, depending upon the length of tube section to be cut) is a switch 115. This switch 115 is positioned so that it will ~e enc3aged and closed by the tubular member 95 as it rides outwardly on the rollers, such as 111, 112 It will be seen that the switch is positioned between the rollers and slightly ;~
therebelow. This switch is connected with the saw motor and when activated, causes the saw to commence to ro-tate.
A second switch 116 is located somewhat outwardly of the saw activating switch 115 and is similarly positioned to be enc3aged by the tubular member 95. When it is engac;ed by the tubular mernber 95, it ac-tivates the solenoid 105 and causes - 14 ~
.
~5~ 7 thc~ saw 89 -to ~>e til~ed upwardly to the cutting position shown in Fig. 15, it having been retracted heretofore and clcarecl by the pipe 95 as it moved across the saw assembly table. Activation of -the solenoid 105 brings the saw 89 upwardly into engagemen-t with the lower surface of the tubular member 95 and to a level, as shown in Fig. 15, of approximately 3/4" into the interior of the tubular member.
Since the tubular member is rotating rapidly, the rapidly rotating saw will quickly cut a section oEf the end of the tube and while doing so, the saw member 89 will slidahly move along its square driving shaft 90 with the tubular member 95 and will soon complete the cut to free the desired section.
~; At the same instant that the saw support frame is rotated for engaging the saw blade with the pipe, or tube/
the solenoid 98 is activated by the switch 116 to draw the return arm 96 to its position as shown in Fig. 16 so as to free `, the saW so as to permit it to slide along the shaft 90 as it is rotati~g. When the cut has been cornpleted, the operator merely ;~ operates the dump lever 117 on the runoff table which causes the cut section oE pipe to be lifted vertically and longitudin-ally, thereby clearing the end of the pipe which continues to emanate from the roller mill 20. When this occurs, the switches 115 and 116 are freed, which cuts off the power to the saw 89 and also to the solenoid 105. This permits the frame 87 to tilt back to retracted position, this function being aided by the spring 94 and the saw is permitted to cease rotating. When the frame 87 reaches its lowermost position, it engages the microswitch 99, which cuts off the power to the solenoid 98, and as a conse~uence, the return arm 96 returns the saw 89 to 3~ its retracted position, as shown at the bottom of FigO 16 in broken lines. It will be seen that the runoff table 22 is provided with a plurality of pivotally mounted ejection arms 118, 119, 120 and 121. These are pivotally mounted upon the frame of the runoff table and when the dump crank 117 is _ 15 _ . . . . . . .
,' : :, : :
9~33~
opcratecl, tlley swing up~ar~lly -to the position shown in Fig.
18, with a result that the cut section will be moved away from the saw assembly and will be projected away from the operator of the crank 117, as a result of the upwardly and inwardly curved projection arms 122 and 123.
In operation, the narrow strip of me-tal 25 passes through the first eight sets of rollers, the cross-sectiona~
configuration of which can bes-t be seen in Figs. 4-11, inclusive, to form the longitudinal corrugations in the strip center line is subjected to an absolute minimum of stress resulting from the flexing ac-tion. ~;
The action ]ust described with respect to the Eormation `
of the lock-seam 62 continues to cause the contiguous `
convolutions of the st~ip to continuously form into a helicall~
.
constructed tubular member which emanates from the roller mill 20 at a slight angle to the axis of the lock-seam-formin~
rollers.
As the tubular member 95 emanates from the roller mill ; 20, it passes outwardly over the flying saw support table and physically clears the same since the saw and saw support are in retracted position. The saw at this point is inactivated and, consequently, the tubular member passes out to the runout table long rollers 111 and 112 and enga~es the switch 115. When the end of the tubular member depresses switch 115, this closes the circui* to the saw motor and the saw commences to rotate rapidly. When the end of the tubular member engages the switch 116, this activates the solenoid member 105 and, consequently, the saw support Erame 87 and the saw 89 pivot upwardly above the shaft 88 until the rapidly rotating saw engages and cuts - -~30 the lower side of the tube ~5. Since the tube is rotating about its longitudinal axis, the saw needs to only travel with the tube sufficiently long for the tubular member to make one rotation about its longitudinal axis, at which time the cut will be completed.
~ t the same tirne as the sol.enoid 105 is activated, the upwarcl movemerlt o.E the :Erclme 87 permlts microswitch 99 to move to "closed" position and this act:ivates the solenoid 98 which draws the saw re~urn arm to its retrac-ted position, as shown ln Fig. 1~. This permits the saw 89 to shift longitud-inally of its driving shaf-t '~0 so that it may move along with the tubular member 95 so long as is requi.red.
When the cut has been completed, the operator merely operates the crank 117 to lift the cut section away from the saw and discharge it laterally. This frees each of the switches, 115 and 116 with the result that the solenoid 105 becomes de-activated and the spring 94 draws the saw 89 downwardly to retracted position, the ~rame 87 thereby engaging microswitch 99 and moving it to "open" position to deactivate electrical solenoid 98 whereupon return arm 96 will cause the saw 89 to .
slide longitudinally of the shaEt 90 back to its initial start-ing position. The saw, meanwhile, will have rotated to a stop and the entire mechanism is ready for ~he next cut. .
` The principal advantages of our invention are provided as a result of the unique geometry and construction of the lock- ~ :
seam, which is provided. We have founcl that this lock-seam has greater strength, provides greater flexibility, and also .
provides "slipability" where desired. ~ince the lock-seam has four separate lock points, it provides much better resistance against possible opening of the seam which normally results in Qther seams from repeated flexing or excessive flexing, or axial torque. In addition to the fact that four separate lock points are provided in our lock seam, its location and :~ arrangement is unique and provides added strength, versatillty, and capability with respect to repeated flexing, excessive flexing and/or the application of radial torque.
~ s can best be seen by reference to Fig. 13, our lock-seam extends along the slope of the common leg of a corrugation of the contiguous convolutions of the strip in the tuhe and - 17 _ 5g~3 ~ :
thu~; it or.fcrs .1 rninilllum res-ista!lcc? to f:Le~xing since i-t will fold entirely within the corrugation iE the flexing is made toward the seam. If it is mac~e away from the seam, -the unique quadruple locking points provide a maximum oE resistance against openincJ of the seam. Moreover, since it is located on .. :
the neutral axis, which by definition, is a line along which the minimum stress is applied, a locX-seam is better able to withstand such stresses merely because of its location and arrangement alone. Moreover, it is symmetrically disposed with - :~
respect to the neutral axis and also with respect to the theoretical center line of the corrugation. It is also ;~
symmetrically disposed with respect to the slope line of the ~ ~
corrugation. Since it extends along the slope line of the - ~-corrugation,.it does not tend to fight normal flexing, as i5 ; the case with seams which are otherwise located. If the flexing is toward the seam, there is no stress upon the seam whatever because of its unique location and disposition and , .
if the tube is flexed sufficiently far, the seam will disappear entirely within the corrugation and offer no resistance to ~0 flexing. As a consequence, it is possible to flex a tube made in accordance with our invention about a diameter that represents as little as 33 per cent of the pipe diameter whereas most pipe heretofore known with other types of seams cannot be bent about -a diameter which is much less than the complete diameter of the pipe. Thus it can be seen that we have provided a marked improvement in the capabilities of such a corrugated tuhe. .~ -~.
.i We have found that with our quadruple lock-seam, a pipe :. .
. utilizing such lock seams permits the pipe to be flexed numerous :. . .
times and we find that the bends and depressions of the four 30 locks provided by our lock-seam prevent the join-t from leaking ~ :
as a result of excessive bending.
Another added fea-ture of our lock-seam is its versatility.
It is possible through the use oE our lock-seam to provide a pipe whi.ch will read:ily permit the appli.cation of axial torque -- 1 ~3 -- ' .. , ', ' '', ' ', . ,.,'' ,' ~' ' ,,- ' ' :- ~ ' 1~ 837 ithout any serious consequences to the seam. Since the extent of compression is reduced by adjusting the position of the upper lock-seam roller 56, a tube can be produced which will permit substantial radial torque to be applied with resultant "slipability" being provided. By "slipability", we refer to the ability of the -tube to be twisted about its longitudinal axis without causing leakage or separating in the ~ `
seams.
~ne of the advantages of our invention is that it is ; 10 possible to manufacture relatively strong corrugated tubing from relatively light and inexpensive metal, such as light gauge aluminum. Moreover, it is possible to produce such tubing in relatively high speeds so that the cost of the same is substantially reduced. With the machine disclosed and claimed herein, for example, the strip speed entering the roll at the points shGwn in Figs. 12 and 13 is 1~0 f.p.m. and helical tubes can be made at the rate of 18 f.p.m. for a 3"
diameter tube. A 12" diameter tube can be made as rapidly as 4-1/2 f.p.m. Thus, it can be seen that we have provided a highly efficient apparatus and method for manufacturing ; ïmproved corrugated tubing.
As noted hereinbefore, the methods which we utili~e provide the necessary longitudinal corrugations in the strip 25 with a minimum of hardening and, conse~uently, the resultant tubing has marked strength when the nature of the light gauge metal which is utilized is considered. The design of our seam or its geometry minimizes the adverse effects of flexing upon ~ -a tube made in accordance with our invention. Since it is . :
- symmetrically arranged with respect to the neutral axis of the corrugation, there is a minimum adverse stress placed upon the seam during repeated flexing and since the seam ex-tends along the slope oE the corrugation leg, there is an absolute minlmum adverse efEect upon the seam when the tube is flexed. No o-ther corruyated tubular members, to our ]~nowledge, have been .~ - .
_ l9 _ , ' ' : . ;
,, ~
~1~59~33'7 hereto~orc~ so ~lesicJned as to take max:imum advantage o~ the fact that minirnum stress is located along the neutral axis of the corrugation ancl upon the seam which cons-ti-tutes a common ~ -ley of a corrugation of contiguous convolutions. We have found that extended flexibility and -the "slipability" of our ; tubes do not inhibit -their ability to main-tain a minimum pressure (6" W.C.) or vacuum (6" W.C.). Our pipe can take velocities in excess of 6000 f.p.m.
It will, of course, be understood that various changes may be made in the form, details, arrangement and prOpOr-tiQns of the parts without departing from the scope of our inven-tion which consists of the matter shown and described herein and set forth in the appended claims.
' ,'~ ' . '`' '' .. . , - .
" ~
.
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~ .
;,' ' - '' ~ ' ." . ~
. ~ :
~` ~
, ' ~
.' ' -~. ' .
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Corrugated flexible cylindrical duct-forming mechanism for producing such duct from a flat narrow elongated strip of formable metal of small guage comprising:
(a) a frame;
(b) rotatably mounted powered roller means carried by said frame and constructed and arranged to die-form longitudinally extending corrugations in such a metal strip and to form oppositely extending side edge portions thereon as it passes therebetween;
(c) guide means carried by said frame and positioned adjacent said roller means in metal strip-receiving relation thereto and being constructed and arranged to preform for subsequent interlocking, such side edges of such strip into seam elements as it passes therethrough;
(d) a pair of rotatably mounted powered rollers carried by said frame and positioned adjacent said guide means in position to receive therebetween such a metal strip after it passes through said guide means and constructed and arranged to form the oppositely longitudinally extending side edge portions of such a strip into inboard and outboard seam elements extending generally at right angles to the general plane of the strip and in opposite directions;
(e) a helically extending warping ring carried by said frame immediately adjacent said seam element-forming rollers, said ring having a generally circular helically extending inner warping surface, the axis of which extends substantially parallel to the axis of said seam element-forming rollers, said warping surface having a leading portion and a trailing portion, said leading portion of said ring warping surface being located ahead of said seam element-forming rollers in position to engage and extend into the corrugation next to the inboard seam element of such a strip and positively direct the same within said ring along said helical warping surface of the said trailing portion of said inner warping surface, said trailing portion of said inner warping surface terminating adjacent to and laterally outwardly of the outboard seam element of said strip which has been so guided by said inner warping surface into the outboard seam element of the strip in interengaging relation and thereby complete a convolution of the strip, and (f) a pair of rotatably mounted lock-seam-forming rollers carried by said frame coaxially with said seam element-forming rollers and outboardly thereof, said lock-seam-forming rollers having lock-seam-forming elements thereon positioned to engage such interengaged seam elements and constructed and arranged to compress and deform the same into a lock-seam constituting a common leg of a corrugation for the contiguous convolutions of the strip, at least one of said lock-seam-forming rollers being power driven.
(a) a frame;
(b) rotatably mounted powered roller means carried by said frame and constructed and arranged to die-form longitudinally extending corrugations in such a metal strip and to form oppositely extending side edge portions thereon as it passes therebetween;
(c) guide means carried by said frame and positioned adjacent said roller means in metal strip-receiving relation thereto and being constructed and arranged to preform for subsequent interlocking, such side edges of such strip into seam elements as it passes therethrough;
(d) a pair of rotatably mounted powered rollers carried by said frame and positioned adjacent said guide means in position to receive therebetween such a metal strip after it passes through said guide means and constructed and arranged to form the oppositely longitudinally extending side edge portions of such a strip into inboard and outboard seam elements extending generally at right angles to the general plane of the strip and in opposite directions;
(e) a helically extending warping ring carried by said frame immediately adjacent said seam element-forming rollers, said ring having a generally circular helically extending inner warping surface, the axis of which extends substantially parallel to the axis of said seam element-forming rollers, said warping surface having a leading portion and a trailing portion, said leading portion of said ring warping surface being located ahead of said seam element-forming rollers in position to engage and extend into the corrugation next to the inboard seam element of such a strip and positively direct the same within said ring along said helical warping surface of the said trailing portion of said inner warping surface, said trailing portion of said inner warping surface terminating adjacent to and laterally outwardly of the outboard seam element of said strip which has been so guided by said inner warping surface into the outboard seam element of the strip in interengaging relation and thereby complete a convolution of the strip, and (f) a pair of rotatably mounted lock-seam-forming rollers carried by said frame coaxially with said seam element-forming rollers and outboardly thereof, said lock-seam-forming rollers having lock-seam-forming elements thereon positioned to engage such interengaged seam elements and constructed and arranged to compress and deform the same into a lock-seam constituting a common leg of a corrugation for the contiguous convolutions of the strip, at least one of said lock-seam-forming rollers being power driven.
2. The structure defined in claim 1 wherein each of said lock-seam-forming rollers has cooperative circumferentially extending seam-forming die surfaces, the medial portions of which extend radially of the rollers and of the convolution of the tube formed from said strip thereby.
3. The structure defined in claim 1 wherein each of said lock-seam-forming rollers has cooperative circumferentially extending lock-seam-forming die surfaces which engage, compress, and deform the seam-forming elements of the strip into a lock-seam constituting a common leg of a corrugation of adjacent convolutions of the strip, the medial portions of said seam-forming die surfaces extending radially of the rollers and of the convolution of the tube formed thereby and the portions of said seam-forming die surfaces intermediate of said medial portions and the terminal portions thereof extending at about sixty degrees to said radially extending portions.
4. The structure defined in claim 1, wherein each of said lock-seam-forming rollers has cooperative circumferentially extending lock-seam-forming die surfaces which engage, compress, and deform the seam-forming elements of the strip into a lock-seam constituting a common leg of a corrugation of contiguous convolutions of the strip, the medial portions and the terminal portions of each of said seam-forming die surfaces extending substantially radially of the rollers and of the convolutions of the tube formed from said strip thereby and the intermediate portions of said seam-forming die surfaces extending at about sixty degrees to said radially extending portions.
5. The structure defined in claim 1, wherein said lock-seam-forming rollers each have circumferentially extending lock-seam-forming die surfaces which cooperatively form a lock-seam constituting a common leg of a corrugation of the contiguous convolutions of the strip, said lock-seam-forming die surfaces being constructed and arranged to extend symmetrically along the slope line of that common corrugation leg.
6. The structure defined in claim 2, wherein said medial portions of said circumferentially extending lock-seam-forming die surfaces are located symmetrically of the neutral axis of a common leg of a corrugation of the contiguous convolutions of the strip formed thereby.
7. The structure defined in claim 1, wherein said pair of rotatably mounted lock-seam-forming rollers are adjustably mounted relative to each other whereby the extent to which the interengaged seam elements of such a strip are compressed may be varied as desired.
8. The structure defined in claim 1, wherein said warping ring is removably mounted on said frame for quick and easy substitution of a similar warping ring of a different diameter to produce a metal tube of that different diameter.
9. The structure defined in claim 1, and (g) roller means supporting said frame to make the mechanism readily portable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA319,357A CA1059837A (en) | 1977-08-04 | 1979-01-09 | Apparatus for making corrugated flexible metal tubing |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA284,044A CA1054958A (en) | 1977-08-04 | 1977-08-04 | Corrugated flexible metal tubing and method and apparatus for making same |
| CA319,357A CA1059837A (en) | 1977-08-04 | 1979-01-09 | Apparatus for making corrugated flexible metal tubing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1059837A true CA1059837A (en) | 1979-08-07 |
Family
ID=25668546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA319,357A Expired CA1059837A (en) | 1977-08-04 | 1979-01-09 | Apparatus for making corrugated flexible metal tubing |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1059837A (en) |
-
1979
- 1979-01-09 CA CA319,357A patent/CA1059837A/en not_active Expired
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