US1378524A - Core-box for pistons - Google Patents

Description

'EQ W; CLARK.

CORE BOX FOR PISTONS.

APPLICATION FILED AUG. 19. 1920.

1,37,52,45 Patented May 17,1921.

2 SHEEIS-SHEETK.

LH IL] E. W. CL-ARK.

CORE BOX FOR PISTONS.

A'PYPL-IICATION FILED we. 19., 1920.

1323524., Patented y 17, 1921.

2 SHEETS-SHEET Z. 1 1

Q K 1 I A Q I l lll I l llll EV 14 UNITED STATES.

EDWARD w. orm, or LOS memes, CALIFORNIA,"ASSIGNOR or oNn-roun'ru'ro PATENT ()FFICE.

.vIonEr n. women, ALL or LOS ANGELES, camronmn.

To'oll'whomit may concern: v Be it known that I, EDWARD W. CLARK, a citizen-of theUnited States, and a resident of Los Angeles, in the county of Los Angeles,State of California, haveinvented new and useful: Improvements'in Core-Boxes for Pistons, cations...

Myv invention-relates to core. boxes for castingv integral l'pistons, of .the character used in internalrc'oinbustion engines, and the main object is to provide a core box especially adapted for making cores for plstons havinginternally formed spiral ribs extending downwardly in the pistonfrom the inner snrface of the head to points substantially below the pin bosses, for the purpose of reinforcing theheadand walls of the p stons so that a'minimum thickness of metal may movement thereof at certain speeds.

- this-application, to other types of coreboxes fbrp1stons of my invention, described in two' applications for, Letters Patentffiled June-130, 1919, [Seri'al No. 309,230; and iii "jects byimeans "of the mechanism .s the accompanyingdraw ,ngs,jormin of this "applicatiomand fended,"

which 'a-singl e-pra'ctica'li H v -:trated, subject tofimaterial 'modi I change,- sw'ithoutjdeparting fro th .s'pi'rit of my invention or enlarging its scope 'beyond that ofthe appended claims.

:In'said drawings: ,7

qFigure 1;,isa side elevation, partly in sec-. tion of my. improved core be; mounted upon afisuitable base, with the rib formin members'gshown at their lower extreme 0 movement in inoperative position; 7

.hsh th'e above andloth'e'r e1 1'1 Fig. 2,.is a sectional elevationof the same,

' arming members in operative p v plates abut an annular rib ,A-on the upperside of the member 7 and the upper ends withthe rib f position.

Fig. 3 is, tion of Fig. 1 on line I Fig. 4 is a section of Fig. 2 on line Fig. 5 is a sectionalv elevation of the body members in closed position center of the pin bosses.- v y Fig. 6 isja sectional plan of Fig. 5 on line M6. V

\ cone-Box r03 Herons;

specification of Letters Patent. Application flled August 19, 1920.. Serial in. 404,075.

of which the following is a specifi be provided in said head andfwalls, thereby substantially reducing the weight of the. pistons inthe engine cylinders and thus cor-W respondingly reducing vibration, due to the and through the, p

" The head ma sk, showing the slots therein, for lng the rib forming'plates. j

ig. 8 is asection ofthe'sam'e.

. Fig.- 9 is an elevation, partly ini'sectiomof a piston produced by meanjsiof my improved core box.

by my core box I In said drawings, B and'B' represent like bod members-having ,main .body moldin wal s'W and W, respeetively,jcorrespon ing core print'molding portions Pfland'P',

and diametrically opposite bosses 2-, 2, ha'vf- Fi .'7 is'a plan view of the sup g d iindg ,ig. 10 is an elevation of a: core produced body members whichseparate at the center ing bores 12 and bf. Withinfsaidbody meme, hers is a central bore lfi'n which the core ofsand or the .like'is adapted toj be formed.

' The body of the core box is adapted tobe positioned as shown-; in thedrawings, with the core e'print molding. portions at the top,"

the lower endof said body ha'ving an opening 3 therein which isfadapted'to movabg receive a circular head niolding member and the upper end of the bodyha's an annular internal head, or rib r fforined' thereon the e n ribpn-th end of use on-a base4 having a: stein S" removably ri f asst screw 6o'r otherwise,

plurality of radiallyformed slots 8, 8, etc,,

which formsa'corresponding jrecess onthe periphery of Bjo'd '.is stationarrly fmountedfor};

7 fheldin sweet on the-upper portion of said' "-.baseb'y nd adish. "end oflfS aidst 14158 I c rried. on the uppef ,mithe body members b Suitably attach said s i yTfi eans' of therein i and adaptedto receiveand hold SI/ 35 pglurality of spirally formed molding plates R, etc. which extend upwardly from portion 7 in spiral leads and are 'of a maximum width at their lower portions 9 anda minimum width at their. upper ends 10., Said, 7

thereof, when in molding position, abut the annular rib 1' of the body, as shown in the stem S by means of which the rib recess molding elements may operative position shown n tive position shown in- Fig locking device for holding the head at its u per extreme of movement may include. a-

unger 11. adapted to seat at its mner end 12 in a suitable notch in the stem, and a sprin 13 carried on said plunger-and atplunger 11 for e plates order to move the head relative to the body v the body. Likewise,

- ends 17 a pair or more of 23, on member B.

it will be obviouslmecessary that. the lower portion 14 of. the y-'wh1ch is of less di ameter than the upper portion in order that extra thickness at the top of the piston where the piston ring ooves to movably receive the head is moved into operative thereon for movably receiving a the inner 18 carried on the extension The lead of the plates P, the slots 15 and the grooves 16 corres nd, so as to im tion to t e head H and dp said members are move stem S b means of the extension E, in a manner similar to themovement of a nut on a screw, except that the lead of the ves is substantially. less than that of t e threads on a screw.

It will be clearly understood from a consideration of the drawings that the plates R form corresponding recesses R in the periphery of members P ates B when the and P form a core print P? on said core; a reduced portion 14" is provided .on the op posite end of the core from said print for providing additional thickness of metal at points 0 posits the ring grooves in the iston; an the endof the core is rovid with an annular rib recess A, ormed by the annular rib A on the head H. Removable pins 20, 20, are provided for insertion in thebores b and b of bosses 2, 2,

and are adapted to extend inwardly into the bore of the bod for formi ig pin boss recesses 2', 2' in t e core C. e body members B and B may be held in proper position by means of dowels 21, held in lugs 22, on member B and seating in similar lugs the use of the core The piston produced b has a cad H with rela- C just described tively thin walls ing portion 14", a central annular rib or on the inner side of the head, 0 posite in bosses 20', a series of spiral ri s R", etc., and an annular rib 1'" at the end of the skirt, as shown in Fig. 9.

naraeee ni oved fromin- A ig. 1 to opera- 2.- A suitable v i the core and the reakin B being spirally formed' in metal may be provided.

' core, after which the core may be removed for v are formed, should have a series o spiralslots 15, 15, etc. formed therein plates P when the ition in the stem S" ay. a pair,-;

and a relatively mot-ab or more, of spiral grooves 16,16, termed;

Qtherein including Ila plurality of spirally .formed plates, for iforn'iin corresponding set screws, or'pins art a rotary moupwardly on the .body members, and relatively means insertible therein,

the .core C; the print molding 24 and ring groove carryuse, and an internal moldi In the o eration of the core box, it will be understoo that when a core has been formed therein and has set for a sufficient length of time to hold together, the plunger 11" may .bereleased' from the stem S so as to lower the R. into the position shown in movement being rotary and plates R are stripped from the core in such a manner as to revent the collapsing of.

head H and rib forming plates Fig. 1.

ticles of sand at' the n recesses. I thej'plates B have been completely with drawn from the mold, the'bod members .13

Such.. downward, the" away ofthe ar-j ,en.

[and B are then separatedan moved hori-i zontall away fromjthe core so'as to with? draw t e pins 20 fromtheirreoesses in the:

use in a castingoperation-for producing istons of the character shown and descri d; WhatI'claim,is: '1. A core box' havin" e memberin'j's'ertib e recesses in the 'core'produce thereby.

a stationary body, v

2. A core boxfhaving a body, 'and'a relatively movable member therein for forming.

spiral recesses in theperiph'eryof the corev produced thereb 3. A core box aving separable body members and relatively movab e means insertible' therein for formin spiral re e in g ,C re produced there y.

4. A'fcorebox having laterally separable for forming.

spiral recesses in the core produced thereby. 5. A core box having a body molding po1 V tion, and relatively rotatable means insertible therein forforming spiral recesses in the" core produced thereby.

6. A core rotatable means for formingespiral retively cesses in the" core and ads. ted to inserted said body.

7. A core box having a set ofseparable body members capable of separation and atf tachment horizontally, and relatively rotatable means for formm spiral recesses in the core and adapted to moved lon itudinally for insertion in and withdrawa from core and the other member having corresponding guideways therefor.

9. Acore box having a fixed bod molding member, means for supporting sai body for rotatably and slidablyhel on said supports mg means, as and for the purpose described. 10. A core box having main molding box having a body, and rela-' member therefor p 100 movable f no" and withdrawn from an longitudinally of 1 members,- anda member insertible therein having a plurality of spiral plates for forming corresponding recesses-in the core.

11. A core box having a body molding means, and relatively adjustable recess molding means including a plurality of spiral plates commonly mounted and movable together to and from operative position in said body molding means.

12. A core box including an adjustable r0- tary member having a plurality of spiral recess forming elements held thereon, for the purpose described.

13. A core box including a molding member having a plurality of spiral recess molding elements, and means for guiding said member into and from operative position.

14:. A core box including a body molding means, and combined head. and recess mol ding means having a plurality of spiral members, and'means in said body molding means for receiving said spiral members.

15. A core box including a supporting structure, a body molding means held thereon, and relatively movable head and recess forming means movable on said support and including a plurality of spiral recess formmg members, as described.

16. A core box including relatively stationary and movable molding members, oneof said members forming body molding means and the other member forming recesses in the core and having a series of spiral recess molding members adjustable relative to said'body.

17 A core box including separable body molding means, pin boss molding members detachably held in said body, a core. print molding member integral with said body, a head molding member movable in and forming a closure for said body, and a series of spiral molding members carried on said head for forming recesses in the core.

18. A core box having relatively adjustable head and body molding members, spiral 'means for advancing and retracting said head relative to said body, and a series of spiral members movable with said head, for forming corresponding recesses in the core. 19. A core box including horizontally movable body members, and a longitudinally movable means longitudinally adjustable relative thereto and including spiral recess forming elements, for the purpose described.

20. A core box having horizontally separable body molding members, a fixed support therefor, and longitudinally movable means rotatable on said support When advanced and retracted relative to said body members, for forming spiral recesses in the core.

. EDWARD W. CLARK. Witnesses:

PAUL Amswon'rn, LUTHER L. MACK.

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