US2756719A - Protecting device for armature shafts - Google Patents

Description

July 31, 1956 PEsEK HAL PROTECTING DEVICE FOR ARMATURE SHAFTS Filed June 30, 1953 6 gzaeiozi a I, E fi/ g 'qQZZy United States Patent-O PROTECTING DEVICE FOR ARMATURE .SHAFTS Rudolph E. Pesek, Berwyn, andv Charles J. Pesek, Brookfield, 111.

Application June 30, 1953, Serial No. 365,137

Claims. .(Cl. 118503) This invention is-directed to portable devices or racks adapted formounting a pluralityof mechanical or structural parts of devices during the course of manufacture andfor temporarily protecting projecting parts of the manufactured articles during the application of any one of a variety of coatings or during the subjection of such manufactured articles to either liquid or vaporous materials. Our devices are adapted for use in connection with protection of parts of the articles regardless of whether the liquid ,or vaporous ,material is applied by immersion, by spraying, brushingor other manual application.

It is an important object of our invention to provid portable devices of thendescribed 'classiadapted to hold manufactured articles in a releasable means and-so that certain parts of the .article will be sealed and protected against contact withvathe liquid; or vaporous material while itis being applied:tortheremainder of the'manufactured articles, and it is a further object, byzprotecting certain parts from.such'appliedmaterial, to eliminate the labor and time of subsequently removing the appliedmaterial from the parts protected by our: device.

A furtherpobject of ;our invention is the. provision of portable racks or holding devices adapted for mounting a plurality of shaft-bearing armatures or; the like during application by immersionto the majorportion ofthe .armatures 'of liquified materials such as resin, lacquer,

or the, like, the function :of *such liquid. material, when later cooled and solidified, :beingeto protecttherwiring of the'armature or:other electric device :against moisture, oxidation and deterioration.

A further object-of our invention is theprovision'of portable racking devices ,having asplurality of .upwardly extending holding membersin" the lowenpart thereof-and into which, holdingmembers. aplurality of projecting shaft end portions are adapted .to be mountedxby gravity so that a temporary seal ifxeffected between-theupper ends of said holding members :and portionsof thesmain body of the armature :SO'thfit upon immersion-into a liquified coating material, the iportionsof therarmatures within said holding members will :not ;-be subjected. to contact with the liquified-"material; said devices also having meansyfor releasablyximpinging the armatures -in sealedposition Withrespect-tmsaidholding members.

Other and; further objects; of our invention {will be apparent from the followingmdescri'ption :and appended claims.

This invention in a-preferred-torm is illustr-a ted and described with particular reference tonthe. armatures of electric motors, though 'it is..to be understoodthatother manufactured structural parts .having .projectingportions to be protected from a liquid material upon immersion, may be satisfactorily mounted. and held indesiredposb tion during process of either submersion in a liquid material or in another form of application of either. liquid or vaporous material'to the exposed parts-of the articles.

On the drawings:

Fig. 1 is an elevational view of our device and with ceris 2,756,719 1C "Patented July 31, 1956 tainparts in cross section and with the same mounted ona typical tank or receptacle and illustrating two. armatures in position.

Fig. 2 is an enlargedcross section view of one of the upwardly extending shaft end members and a fragment of'the lowercasing, housing or base in which saidholders are mounted.

Fig. 3 is a perspective view of our device and without any manufactured articles mounted on the holding members thereof.

As shown on the. drawings:

Referring to Fig. 1, numeral 10 designates'an elongated casing, housing or enclosed base defined by bottom and side walls and by a substantially elongated upper wall 11 in which a plurality of spaced apart openings or apertures are formed. Said mounting base or casing 10 is preferably relatively long and shallow, though its :depth and proportion may vary according to the type and, size of the projecting portions of manufactured articles to be mounted with respect to same. 'One of the purposes of said mounting base which forms a relatively rigid portion of our portable rack is to provide a completely enclosed and scalable spaceor chamber in which the lower endlportions of the articles to be partially protected and shielded from a liquid or vaporous bath may project.

Reference numeral 12 designates a metal vent pipe whose lower end portion is suitably secured, for example by welding in an aperture 13 formed preferably in the intermediate portion ofthe upper wall 11. Said vent pipe 12 extends upwardly a suflicient distance sothat its opening will be Well above the surface of any liquid bath into which the device is placed. Said vent or breather pipe 12 allows expanding heated air to escape from within the chamber of the casing 10, both during immersion and during the subsequent baking which hardens the resin. Such escape of air prevents breaking of the seal between tape 21 and sleeves 18.

Numerals 14 designate a pair of suspension and connecting metal rods whose lower ends are suitably secured, for example, by threading engagement in the opposite ends respectively of the upper metal wall 11. A, The upper ends of said rods or bolts 14 are threaded and are adapted to be relatively mounted in suitably spaced openings in an elongated metal crossbar 15, said releasable securance being preferably'by means of a pair of wing nuts 16 as illustrated in Fig. 1.

Washers or stop lugs 17 illustrated in Fig. 1 are preferably mounted on the upper ends of theconnecting-rods 14 in fixed and secured positions at the lower end-ofthe upper threaded portions of rods'14 so that the same act as a stopping or limiting means against thevfurther descent of the crossbar 15. This permits the wing nut16 to be tightened by hand and so that the samewill. be under tension, the said stop washers 17 forming the resisting elements against further movement of cross bar 15 in a normally downwardly direction. I desire it .to be understood that other equivalent releasable fasteningelements may be utilized in substitution of the wing nuts-16 and the threads on the rods 14-to releasably mount the carrying and cross bar 15 with respect to'the upper nortions of the connecting rods or bolts '14.

The cross bar 15 is preferably'made of flat metal straps or bands and of a length substantially longer than the length of the base 10, said length also being suchthat the opposite projecting ends maybe rested upon and supported by either the side walls orthe end walls of a tank or receptacle which is adapted to containtheproper depth of liquid material to which the manufactured articles are to be subjected either by immersion or other manual application.

A plurality of metal sleeve-like or tube-like mounting and holding means 18 are mounted in longitudinal spaced positions in spaced apart holes formed in the upper wall 11 of the base or housing and these are secured in perpendicular and normally upwardly extending position by either welding as indicated at 19 or optionally by threading engagement with side Wall 11. The distance between the respective holding members 18 may vary in a wide range and be of such distance to provide ample clearance and spacing between the projecting and exposed parts of the armatures or other mechanical articles or structures which have an enlarged body portion and a projecting reduced portion. In other words, the smaller the maximum dimension of the manufactured articles, the closer the respective holding members 18 may be mounted so that more of such articles may be treated or coated in a holding rack or with a base of a given size.

The upper end portions of the holding members 18 are exteriorly beveled to provide a substantially sharp annular edge 20 on each thereof, and so that the inner circumferential face of said holding members extends straight downwardly from the relatively sharp annular edges as illustrated in Fig. 2. In the manufacture of armatures for electric motors and generators the metal shafts of the desired length and diameter have first applied to their intermediate portions (for a distance slightly longer than the combined length of the armature body and the commutator segments) a suitable insulating tape 21 which is spirally wound about the intermediate portions of such armatures so that such tape will provide an insulation between the inner subsequently wound wires and the shaft. The insulating tape 21 is wound on such armatures so that a small part of the endmost convolution of such tape will be exposed beyond the end portion of the body of the armature, as illustrated in Figs. 1 and 2. The inside diameters of the holding members 18 may be substantially the same, though very slightly greater than the diameters of the shafts or projecting parts of the armatures or mechanical structures to be mounted so that the projecting parts to be protected during the application of a liquid material will fit substantially snugly into the holding members 18, though with sufficient clearance to permit insertion and withdrawal of the armatures by hand.

pulleys, gears or the like.

It has been found that the application of either a liquid resin or other protecting coating to the projecting portions of the shafts 23a, simultaneously with the application of such protecting coating to the wires of the armatures themselves, necessitates the laborious and timeconsurning work of subsequently removing the hardened resin coating or other hardened protecting material from one projecting end portion of shaft edge armature.

When those propecting portions of the armature shaft which are opposite the commutator-carrying portion are inserted and allowed to rest by gravity in the respective bevelled holders 18, the annular bevelled edges 2i will slip partially under the edge of the projecting part of the insulating tape 21 in the manner illustrated in Fig. 2 and so that a temporary seal is formed between the bevelled edges 20 of holders 18 and the tape 21 on each of said armatures, this preventing the entry of the liquid resin or other liquid coating or treating material which may compose the bath or liquid mass into which the armatures are partially submerged.

Said armatures 22 are mounted in said holders in the described manner while the cross bar 15 is removed. After an armature has been mounted in said manner in each of the respective holders 18, the cross bar is mounted upon the connecting rods 14 and the nuts 16 are screwed tight on the threaded ends of rods 14 and thereupon the rack and the mounted armatures are ready for immersion or for other manual application of the liquid material to the exposed parts of the armatures or to desired portions thereof.

In the manufacture of armatures, it is desirable that the relatively hot liquid resin or equivalent moisture-resistant material be applied to the wires of the armature and accordingly the vertically positioned armatures mounted in the manner described and with the cross bars 15 preferably impinging upon the upper end of the armature shafts 23, be immersed in the hot resin bath only to a depth so that the hot liquid resin will run into the spaces between the wires of the armatures and coat itself upon such wires and so that such resin material will not contact the commutator bars or segments or the uppermost ends of the shafts-23. After the armature bodies have been immersed for a short time in a body of said liquid resin or other protective coating material which is of the type adapted to harden in normal room temperatures, the entire rack is withdrawn from the body of the liquid material and the surplus liquid material allowed to drip off, and in normal practice, the said racks holding said armatures or parts are mounted on suitable brackets of an oven and then baked until the resin will harden upon the wires and the armature body to form a firm moistureresistant and insulating coating thereon.

The individual armatures may be withdrawn by hand from the holding members 18 either as soon as the rack has been withdrawn from the oven or after the resin has partially or fully hardened.

It will be understood that the said rack and holding members may be repeatedly reloaded with either armatures or with other structural parts which have rounded projecting portions extending from a major body portion so that when the projecting portion is inserted into the holding members 18, a temporary seal will be provided between the bevelled ends 20 of member 13 and the major body portion of the article and so that the liquid coating or protecting material will be thereby prevented from contacting the projecting reduced portions within the holding members 18.

In instances where the armatures or other articles mounted in the rack as aforesaid are immersed into a relatively hot bath, the transfer of heat from the bath through the walls of the base or casing 10 will heat the air within said casing 10 to cause its expansion. Therefore, it is advisable to provide a means for permitting the escape of a portion of such heated air so that such expanded heated air will not force itself upwardly through the respective holding members 18 and through the spaces between said holding members and the shaft portions 23a and through the seal between the upper bevelled end portions of said holding members and either the tape 21 or the enlarged body portion of the article in instances where no such projecting tape is present. The forced escape of heated air through the temporary seal would cause a leakage and entry of part of the liquid coating and protecting material through such temporary seal, and this is prevented by the provision of an air vent means exemplified by the vent pipe 12 which extends upwardly a suflicient distance to always have its outlet above the mass of heated liquid material into which the rack and its held articles are immersed.

We desire it to be understood that our novel rack and holding means may be satisfactorily used for temporarily shielding and protecting the projecting portions of various manufactured and merchandise articles other than armatures and also in instances where the liquid material to be applied to the exposed parts of such manufactured articles is applied in the form of a spray, for example a spray gun from which lacquer, paint, enamel or other protecting and treating material is to be applied to the exposed parts of the manufactured articles.

The use of our novel holding and protecting means such as described in the aforesaid example saves a considerable amount of labor and costs which have otherwise been necessary in the usual dipping of armatures and other articles into a liquid type of coating and protecting material and which necessarily must be subsequently removed from portions of the shaft of the armatures or from portions of the manufactured articles which require contact and remounting with other structural and mechanical parts.

As many changes could be made in the above construction, and as many apparently widely different embodiments of my invention within the scope of the claims could be constructed without departing from the spirit and scope thereof, it is intended that all matter contained in the accompanying specification shall be interpreted as illustrative and not in a limiting sense.

I claim:

1. In a device for protecting projecting parts of mechanical structures during applications of coatings to portions of such structures; an elongated apertured cross bar; an elongated base comprising a housing having closed ends and having a plurality of upwardly opening apertures therein; a plurality of upwardly extending connecting bars having their lower ends connected to said base, the upper ends of said connecting bars being threaded and removably mounted in apertures of said cross bar; a plurality of metal cylindrical tube-like holders mounted in said base and spaced longitudinally thereof, said holders being exteriorly bevelled at their upper ends to present relatively sharp annular edges, said holders being adapted to receive the projecting portions of mechanical structures which are to be protected during application of protective coatings to the remaining and exposed parts of said mechanical structures, said bevelled upper edges of said holders being adapted to engage and form a seal with the normally exposed parts of said mechanical structures.

2. In a portable device for protecting the projecting portions of shafts of armatures or the like during the step of immersion of such armatures in a body of hot liquified moisture resistant material; an elongated casing having a substantially flat upper wall; an upwardly extending bent pipe mounted in said upper wall and being of a length to extend above a receptacle into which said device is positioned; a plurality of cylindrical mounting members mounted in spaced apart relation in said upper casing wall; each of said mounting members having its upper end bevelled; the bevelled portions of each of said mounting members being adapted to have the projecting end portion of an armature shaft mounted therein to provide a seal with said armature shafts; an elongated cross bar having projecting ends adapted to be positioned on stationary objects during the immersion of said armature; and a plurality of connecting rods secured at their lower ends to said casing and having manually removable connection means on their upper ends adapted to releasably connect said rods to said cross bar, said vent pipe having an upper portion extending above the top of a receptacle into which said device is immersed to permit escape of air from Within said casing.

3. In a portable device for protecting the projecting portions of mechanical articles during the step of applying liquid compositions to portions of said articles; an elongated base comprising a closed housing and having a substantially flat upper face; a plurality of cylindrical mounting members mounted in spaced apart relation in said upper face of said base; each of said mounting members having its upper end of annular shape; each of said mounting members being adapted to have the projecting end portions of a mechanical article mounted therein whereby the upper end portion of each of said mounting members will engage and form a temporary seal with the larger portion of the mechanical article to thereby protect the inserted portion of such article from contact with a liquified material during application of said liquid material to the exposed portion; an elongated cross bar having projecting ends adapted to be positioned on stationary objects during the application of said liquid material; and a plurality of connecting rods secured at their lower ends to said base and having manually removable connection means on their upper ends adapted to releasably connect said rods to said cross bar.

4. In a device for protecting projecting parts of mechanical structures during applications of coatings or liquid materials to portions of such structures; an elongated apertured cross bar; an elongated housing providing a base and having closed ends and having a plurality of upwardly opening apertures therein; a plurality of upwardly extending connecting bars having their lower ends connected to said base, the upper ends of said connecting bars being removably connected to said cross bar; a plurality of metal cylindrical tube-like holders mounted in said base and spaced longitudinally thereof, said holders being bevelled at their upper ends, said holders being adapted to receive the projecting portions of mechanical structures which are to be protected during application of protective coatings or materials to the remaining and exposed parts of said mechanical structures, said bevelled upper edges of said holders being adapted to engage and form a seal with the normally exposed parts of said mechanical structures.

5. In a device for protecting the projecting portions of mechanical structures which include an enlarged body portion; an elongated hollow metal housing having an apertured substantially flat upper wall; an upwardly extending air vent pipe communicatively connected to said upper wall of said container and being of a length to extend above the top of a receptacle into which said device is positioned, an apertured elongated metal cross bar having its opposite ends projecting outwardly and adapted to be positioned upon the opposite portions of a receptacle or the like; upwardly extending connecting rods secured to the upper wall of said container and being removably connected to said cross bar; a plurality of upwardly extending spaced apart tube-like article holders securely mounted in the upper wall of said container and extending upwardly a sufficient distance to form a protective enclosure for projected parts of the mechanical structures to be partially coated, said holders being adapted to protect said projecting portions against a liquified coating and being adapted to form a temporary seal at the areas of engagement thereof with the enlarged portions of said mechanical structures; said cross bar and connected container and holders providing for immersion of a plurality of mechanical parts partially mounted in said holders and into a body of liquified coating material within a tank.

References Cited in the file of this patent UNITED STATES PATENTS 293,374 Swift Feb. 12, 1884 930,129 Beausejour et al Aug. 3, 1909 1,012,192 Corkery Dec. 19, 1911 1,978,290 Arthur Oct. 23, 1934 2,264,703 Lenz Dec. 2, 1941 2,327,410 Ferguson Aug. 24, 1943 2,352,857 Nachemov July 4, 1944 2,559,958 Herts et a1. July 10, 1951

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