US2669759A - Mold ejecting mechanism for mold-forming machines - Google Patents

Description

E. l. VALYl Feb. 23, 1954 MOLD EJECTING MECHANISM FOR MOLD-FORMING MACHINES Filed June 20, 195' 9 Sheets-Sheet l men: in

Gitorneg E. I. VALYI Feb. 23, 1954 MOLD EJECTING MECHANISM FOR MOLD-FORMING MACHINES 9 Sheets-Sheet 2 Filed June 20 1951 w 4 MA, I Y m 5 (Ittorneg Feb. 23, 1954 E, VALY] 2,669,759

MOLD EJECTING MECHANISM FOR MOLD-FORMING MACHINES Filed June 20, 1951 9 Sheets-Sheet 5 ZSnnemtor 51?) VAL Y/ 2 (Inc-meg Feb. 23, 1954 E7 vALY| 2,669,759

MOLD EJECTING MECHANISM FOR MOLD-FORMING MACHINES Filed June 20, 1951 9 Sheets-Sheet 4 67 I 3n'nentor .ewfleY W W ttorneg Feb. 23, 1954 E. l. VALYl 2,669,759

MOLD EJECTING MECHANISM FOR MOLD-FORMING MACHINES Filed June 20, i951 9 Sheets-Sheet 5 lnvemorr lfffy 1444 Y/ ttorneg Feb. 23, 1954 E. l. VALYl 2,669,759

MOLD EJECTINC MECHANISM FOR MOLD-FORMING MACHINES Filed June 20, 1951 9 Sheets-5heet 6 lnventor Gttorneg E. l. VALYl Feb. 23, 1954 MOLD EJECTING MECHANISM FOR MOLD-FORMING MACHINES MW \k IAN \v 9% 9 Sheets-Sheet 7 5/7519) 2'. l ALY/ Filed June 20, 1951 Gttorneg E. l. VALYI Feb. 23, 1954 MOLD EJECTING MECHANISM FOR MOLD-FORMING MACHINES 9 Sheets-Sheet 8 Filed June 20, 1951 M V i. M W 5 E. l. VALYI Feb. 23, 1954 MOLD EJECTING MECHANISM FOR MOLD-FORMING MACHINES 9 Sheets-Shea:v 9

Filed June 20 1951 Zhwenfor inf/er Z VAL Y/ Gttorneg Patented Feb. 23, 1954 MOLD. EJECTING MECHANISM. FOR, MOLD F-ORMING MACHINES Emery I. Valyi, Bronx, N. .Y.

AppIicationJimeZO 1951, S.erial.;N0-.2.3.2,505

7 Claims. (01. 2248) This. invention relates. generally to machines for producing foundry'molds in shell formironr a molding mixture. comprisinga refractory and. a bonding. agent.

producing shell molds in machines". of this character anexcess quantity of the. moldingmixture. is. applied to l the face. of a. preheated metal pattern which is mounted in a suitable pattern" carrier; The mixtureis. held'in contact with the: pattern untiltlie contacting portion thereof bonds and solidifies.into.a.partially cured layer or'shell having: a uniform thickness of, for example, between one-eighth. inch and. one-quarter. inch; The. thickness of. the shell depends on the timeof contact. of. the. mixture andlthe temperature of. the pattern. The unbondecl portion of. the mixture. isthenremovedi fromthe patternleaving thepartially. cured. shell. thereon. Theshell is; then. subjected to. a curing temperature of, for" examplahetween. 5009?. and 900? F. until the shell. is cured. to. a. hard. rigid; strong condition. Themold isthen stripped from the patternaiter whichthe pattern istreat'edjwith a parting solw tion and. the operation repeated. The: advancetreating 055- the pattern with a parting. solution prevents. the. shell. from adhering to the patternv so tightly thatitmight be broken during: stripping.

This. application. is-specifi'cally directed to the mechanism for stripping the cured. shells from the patterns and. removing the shells from the; machine. The embodiment of' the invention shown and described herein isespeciallyaclapted for; use. inthe. mold-forming machine disclosed" inmyco-pending application Serial l lo..226,229;

the. stripping mechanism. The. pattern carrier" also. carries. an ejector plate which is slidabl'y' mounted on a plurality of rods which are secured to andextend downwardly, from the underside of the patternicarrier. The ejector plate has securedthereto a plurality of stripping pins which extend upwardly through apertures in the pattern andterminateflush' with theface of the pattern. The number and the arrangement of thestripping pins isdependent upon the shape of the pattern and the mold formed thereon. In stripping a mold shell from a pattern the ejector plate is engaged by suitable mechanism and moved toward the carrier which projects the stripping pins-- out through the apertures in the pattern, thus stripping the shell from the pattern;

As shown herein the pattern; carrier and. the,

tit?

3 the. carriage.

2 pattern; with a cured" mold shell adhering to the face thereof, are presented to the stripping mechanism in'inverted' position between the ejector plate actuating; mechanism and, a. moldreceiving tray which is removably secured inposition on a reciprocal. carriage; As-the patterncarrier advances into stripping position .the" ejector plate-actuating mechanism engages'opposita sides of the ejector plate; The plateeactuating mechanism remains inactive. until the receivingtray has been moved. upwardlyfromits carriage into. proximity with the mold'shell, aftenwhichthe ejector plate andthe tray'are moved down"- wardly. in unison untiLthe. tray comes to rest. on

The ejector plate is then returned" to. its, original position while the" tray'with the: mold shell thereon remains. in itsoriginal position on the carriage. The carriage is then" actuated'by suitable, mechanism to convey thettrayand shellthereon out of" the machine where the: mole. shell is removedirom' the tray, The; carriage with the tray thereon is thenpreturned'to'its original position after which. everythingis in". readiness for. thenext stripping operation.

The principal. object of" theinvention is to. provide in a. shell mold-forming machine improvedmechanism for stripping shellimolds from patternsandconveying theshell'. molds from the: machine.

Another. object of, the. invention is to provide a mechanism of this character which isv efficient in operation, is of.v relatively simple construction, andwhich is..operative to successively strip mold shells: frompatterns presented thereto without" danger of. breaking the. shells during strippingand. discharge thereof. from the. machine.

Other.andllmorelimitedlobj ects oflthe invention will beapparentfromthe followingspecification and. the. accompanying. drawings. forming a part" thereof wherein:

Fig. 1 is a. fragmentary longitudinal section.

Fig. 3 is a horizontal section taken on the line of Fig. 1;

Fig. 4 is an enlarged verticalsection taken on the line i t ofFig; 2;

Fig. 5 is a view similar to Fig. 4. showing: the mold-receiving tray raised? from its. carriage: into engagement: with a mold; shell; preparatory to stripping. the shell. from: itsv pattern Fig; 6.is an. enlarged: vertical section. taken. on I the: line 517-5. of. Fig. 2 showing the: mold: shell stripped from the pattern onto the receiving tray with the various parts in the pos tion they assus e at the end of the stripping operation;

Fig. '7 is a fragmentary view similar to Fig. 6 showing the carriage conveying the tray and shell out of the machine;

Fig. 8 is an enlarged fragmentary horizontal section taken on the lines E-& of Figs. 2 and 9;

Fig. 9 is a vertical section taken on the line 9-9 of Fig. 8;

Fig. 10 is a detail section taken on the line ill-50 of Fig. 9; and

Fig. 11 is an enlarged detail section taken on the line ii-ii of Fig. 3.

Referring now to the drawings by reference characters, the numeral 3 indicates the frame of a mold-forming machine, such as that shown and. described in my aforesaid co-pending application Serial No. 226,229, filed May 14, 1951.

The mold-forming machine includes a pair of spaced parallel chains 2 which are arranged to be intermittently driven in the direction indicated by the arrows A around idler sprockets 3 which are rotatably mounted upon stub shaft t carried by the frame i.

A pattern-carrier 5 is secured to and between the chains 2 for movement therewith. Each pattern-carrier 5 comprises a rectangular frame M having an inturned annular flange it? around the lower edge thereof. pattern l d is removably secured within the frame i l upon the inturned flange 55 by any suitable means, not shown. The frame l5 has a pair of shaft hangers l1 formed integral therewith and extending downwardly therefrom, one at each side midway between the forward and rear ends thereof. A transverse shaft id is rigidly secured in bores 59 in the hubs 22 of the hangers i? by pins 23. The shaft 58 is rotatably mounted in the hubs 2d of a pair of opposed trunnion links 25, one of which is interposed in each of the chains 2 in place of one of the standard chain links. A rocker arm 26 is keyed to each end of the shaft I8 adjacent the trunnion links M. Each of the rocker arms 26 carries a pair of rollers 23, one at each end thereof, which are adapted to ride on tracks 29 which are mounted upon the frame l along the outside of each of the chains 2. Each end of the shaft is has an inwardly extending axial bore 32 therein in which A heavy thick metal 3% is slidably mounted a rod 33 which carries a locking bar 34 at the inner end thereof. The locking bars 34 extend out through elongated slots at in the shaft if! and into opposed slots 36 and 3? in the hanger hubs 22 and the trunnion-link the depth (front to back) of the slots 36 in the hanger hubs 22 is at least equal to the width of the locking bars 3 5, and is substantially greater than the depths of the slots 31 in the link hubs 24, so that the locking bars 34 may be entirely 3 Withdrawn from the slots 3'! into the slots but cannot be entirely withdrawn from the slots 36 into the slots 3?. Thus, when the locking bars 34 are disposed in both the slots 36 and 37 as shown in Figs. 8 and 9, the shaft :8 and the frame it carried thereby are locked against rotary movement with respect to the trunnion links 25; and when the locking bars 345 are with drawn from the slots 3'! into the slots 36, the shaft may be rotated in the trunnion links 25 by the rocker arms 26 to shift the frame it from upright to inverted position, or vice versa, as and for the purpose hereinafter described. The rods 33 carry small rods 38 adjacent the outer to the shaft ill between the gears 65.

hubs 245, respectively. AS shown in Figs. 8 and 9, diameter of t gear 59 is preferably about 8 from one at each corner thereof.

ends thereof which extend out through elongated vertically aligned slots 42 and 43 in the shaft 18 and the rocker arms 28, respectively. A small roller 44 is mounted on each end of the rods 3%. Springs d5 in the bores 32 behind the rods 33 urge the rods 33 outwardly and the locking bars 34 into locking position in the slots 3?. The locking bars 34 are moved into the slots 36 out of locking position by moving the small rods 38 and through them the rods 33 inwardly against the outward pressure of the springs 45.

A plurality of rods 46 having heads 41 on the lower ends thereof are secured to the underside of the frame [4 and extend downwardly there- An ejector plate 48 is slidably mounted upon the rods 46. In normal upright position of the pattern carrier 5 the plate 48 rests upon the heads ll of the rods at, and is yieldingly held thereagainst by balls 49, in horizontal bores 52 in the plate 38, which are urged into engagement with tapered notches es in the rods 46 by springs 54. Plates 55 carrying a plurality of stripping pins 5% are removably secured to the ejector plate 48. The stripping pins 56 extend upwardly from the plates 55 through bores 51 in the pattern l6 with the upper ends thereof normally terminating flush with the upper surface of the pattern 16. The ejector plate 48 has two spaced outwardly extending cylindrical bosses 58 secured to each side thereof which are adapted to be engaged by the plateactuating mechanism to move the ejector plate.

toward the frame E4. The movement of the plate 48 projects the stripping pins 5's out through the bores 5i which'strips the mold shell 59 from the pattern as is explained in detail hereinafter.

The stripping mechanism comprises the ejector plate-actuating mechanism which is disposed above the conveyor chains 2 and a mold-receiving tray 6! which is disposed below the chains 2. The tray M is removably secured in place on a discharge carriage 62 for movement therewith into and out of the molding machine.

The carriage t2 comprises a plate 553 which is secured to a pair of spaced parallel elongated racks M which are supported by pinion gears 65 at the forward ends thereof and by guides 66 spaced inwardly of the machine from the pinion gears 65. The pinion gears 55 are keyed to a shaft 61 which is rotatably mounted in suitable bearing blocks $8. The guides 66 and the bearing blocks '58 are rigidly secured to the molding machine frame l. A pinion gear 69 having a much smal er pitch diameter than the gear 65 is keyed The pitch of the rack ill rotates the shaft 5? and gears 65,

through the gear 58. The rotation of the gears 55 moves the racks lid and plate 63 carried thereby outwardly at approximately three times the speed of movement of the rack it! due to the difference in the pitch diameter of the gears 55 and 69. By this arrangement the carriage 52. is

moved a fixed distance by a much lesser movement of the rack ill.

When the rack it is moved in the opposite direction the carriage 62 is brought back to its original position in the machine in the same manner. As the carriage or is moved outwardly from the machine the racks 6'14 engage supporting guides- 72 secured to the frame I.

The tray Gt comprises a rectangular frame i and a mold' support To which conforms to the contour of the pattern and mold shell and is removably secured in the frame 15. It will be understood that when a different pattern I5 is used a correspondingly different mold support 16 will be used. The" frame has a plurality of transversely extending angle irons ii secured to the underside thereof which seat upon the plate 63 of the carriage 62. Certain of the angle irons H have blocks 18 rigidly secured to the sides thereof. 19 therein into which pins to secured to the plate 63 extend when the tray 65! is in place on the carriage 62. It will be apparent that with this construction the tray 6i may be raised vertically from the carriage 62, but cannot be shifted laterally thereon. The home It hasa longitudinally extending channel member ti secured to each side thereof.

The ejector plate-actuating mechanism til ismounted upon a platform 85 carried bythe frame I above the conveyor chains 2 and comprises a vertically reciprocal beam t6 which is adapted to be raised and lowered by a hydraulic cylinder and piston assembly 8? which is carried by the platform 85 and isoperatively connected to the beam St at the geometrical center thereof. pairs of rods 83 are rigidly secured to the beam-lit; one pair adjacent each side thereof, and extend downwardly therefrom through guide sleeves 39 carriedby the platform 215. Each. pair of rods 88' has an inwardly extending bracket LFl adjust ably secured to the lower ends thereof. When the carriage 62, with tray iii thereon, is in its.

The blocks T8 have vertical apertures normal position within the machine the inner edges of the brackets Eli are disposed in the grooves in the channel members il-i' secured t'o the sides of the tray frame 551 With this construction it will be apparent that as the beam 86 is raised and lowered by the cylinderancl piston assembly tl thetray 6 I will be raised and lowered" in unison therewith.

Two pairs of rods 511 are slidably mounted for vertical reciprocation in guide sleeves 92" carried by the platform fits and vert'cally aligned sleeves 93 carried by the beam iiti longitudinally extending groove 95': in the inner face thereof is rigidly secured to the lower ends of each pair of rods. Pneumatic cylinder and piston assemblies to which are secured to the underside oi the" platform t5 and extend downwardly therefrom are operatively connected to the bars Sitone assembly or being connected to each bar at. The cylinder and piston assemblies 8B constantly biasthe bars as and the rods 9 5 connected thereto to their uppermost position. Latching means lilo is provided adjacent each pair of rods iii by which the rods 9% are lockedto the beam to for downward movement therewith. As a pattern-carrier 5 is moved into strip- A bar M having a l the machine.

I03 which i's connected to and? between the arms. 10! slightly above a plane through the pivoted.

axis of the arms. The outward movement of the arms I01, under the influence of the spring? we; islimit'ed by adjustable stops HM, mounted inlug's I 05 onthebrackets H12, which are. engaged by fingers H16 extending upwardly from the arms llll. Each arm Hli has a notch we hear the lower end thereof which is adapted to en gage a roller i 38" carried by the associated rod ill. thelower end thereofwhich is adapted to engage a stationary cam l Ill, mounted on thep1atform- 85, as the" beam 86" approaches the lower" limit of its movement.

operations. patternscarrier' 5 with a cured shell mold 59 adhering to the pattern llcarried thereby; is presented to th stripping and discharge mechanism in inverted position as shown in Fig. i, with the 5ton the sides of the: ejector plate engaging in the notches 95 of the bars 9 Pressure is then applied to the undersideoi the piston of the cylinder and piston assembly 3? which raises the beam tt from thep'ositi'on shown in Fig. e to the position shown 5. As the beam 3'6 moves upwardly it Ia aesthe tray ti from the carriage 62 up into engagement with the mold. shell During the in .1 am movement of the beam to and tray 61 positic el'd thereby the pneumatic sense in the" der and piston assemblies Atthe-upperlimit of movement of the beam f the arms ld iare swung outwardly by the ring ltthiifil the notche Itl'engage the rollers rried by the rods El: which locks the bars" t l t tne'beam 3i)" fordownwardniovement therewith. Pressureis then applied to the upper side the piston ofthe cylinder and piston assem bljy M to move the beam 86 downwardly against the constantly exerted upward pressure of the cylinder and piston assemblies 9%. As'the beam at ismoved downwardly from the position shown iniliigi. 5 to the'position shown in Fig. 6?, thetray thusireei'ng therods il l and bars 95 from the The cylinder and piston assemblies beam BE. 23 then return the rods 9 ,bars 9 's, ejector plate 48; and stripping pins back to their original position shown; in Figs. l, 5 and 7, and the beams= 3t, rods: 88 andl brackets 30 remain in. their lowermost positions with the tray Bl, with: the. mcldi shell 59? thereon, in position. on thecarriagot tit. and. the brackets: 96' engaging in the slots ini the channel.

55*. The meet tion shown? in. Figs;

members t l on the tray n'isrn is now the posi- 2 and 4' ready for the carri'age to conv'er'hthe stripp'ed mold shell 59 from. Pressure is: then applied to the: cylinder and piston assembly Tl which actuates carriage.asshotwnj in Figs. 3 and 'lto convey l with the mold shell thereon out the tray of the machine; tray t t is move-d 0ut-- wardly by the: conveyor the channel members 81 ii out or with thebracket's $01 Acter'the'mold shell tillhas been removed from th the pressure in-the cylinder and piston assembly ii is reversed which returns the carriage and tray back to their original position in Each arm Hll also carries a roller 10-9: at

the machine with the channel members @I again engaging the brackets 90.

The mechanism is now in condition for the next stripping operation. After the mold shell has been stripped from the pattern It onto the tray ill and the ejector plate and the stripping ins have been returned to their normal position, the pattern-carrier is moved away from stripping position and returned to upright position in readiness for the forming of another mold shell.

From the fore-going it will be apparent to those skilled in this art that I have provided a very simple and efiicient mechanism for stripping mold shells from the patterns on which they are formed and discharging them from the moldforming machine.

It is to be understood that I am not limited to the specific construction shown and described herein as modifications may be made therein win. 1 the scope of the appended claims.

What claimed is:

1, A inecha r for stripping mold shells from patterns comp ng a pattern-carrier having a pattern mounted thereon, an ejector plate slidably supported by pattern-carrier in spaced relation thereto, a plurality of stripping pins secured to said ejector plate and extending into apertures in said pattern and terminating flush with the face of said pattern, vertically movable mold-receiving means below said pattern carrier, a reciprocal beam and means by which said beam is reciprocated, interconnecting means between said beam and said mole-receiving means through which said mold-receiving means is moved ver ically toward and away from said pattern oarrier by the reciprocation of said beam, ejector plate-gripping mechanism, releasable lat hing between said beam and said ejector plate-gripping mechanism through which said gripping-mechanism is actuated by said beam to move ejector plate in unison with said receiving means in a direction to project said stripping pins out through said apertures beyond the face of said pattern for stripping a mold shell from said pattern onto said moldreceiving means while maintaining said mold re cciving means in mold supporting position during 'ie stripping thereof from said pattern.

2. A mechanism for stripping mold shells from patterns comprising a pattern-carrier having a pattern mounted thereon, an ejector plate slidably supported by said pattern-carrier in spaced relation thereto, a plurality of stripping pins secured to said ejector plate and extending into apertures in said pattern and terminating flush with the face of said pattern, vertically movable moldn'eceiving means mounted below said pattern, a platform disposed above said mold-receiving means, a plurality of rods slidably mounted in guides carried by said platform, a beam rigidly secured to the upper ends of said rods, a pair of spaced opposed brackets rigidly secured to the lower ends of said rods, means slidably connecting said mold-receiving means to and between said brackets, means operative to move said pattern-carrier into stripping position between said mold-receiving means and said platform, a second set of rods slidably mounted in aligned guides carried by said platform and said beam, a pair of spaced opposed ejector plate-gripping means rigidly secured to the lower ends of said second mentioned rods, means yieldably holding said ejector plate-gripping means and the rods secured thereto in their normal up position, means operative to raise and lower said beam to move said mold-receiving means into and out of mold-receiving position, and releasable latching means operative to lock said second set of rodsto said means for downward movement therewith, whereby said mold-receiving means, said ejector plate and said stripping pins are all moved downwardly in unison thereby stripping a mold shell from said pattern onto said mold-receiving means.

3. A mechanism for stripping mold shells from patterns, as set forth in claim 2, having means operative to move said mold-receiving means into and out of engagement with said brackets.

4. A mechanism for stripping shell molds from patterns, as set forth in claim 2, in which said releasable latching means comprises a plurality of pivoted arms carried by said beam, engageable means carried. by each of said second set of rods, means operative to move said arms into engagement with said engageable means as said beam approaches the upper limit of its movement, and means operative to move said arms out of engagement with said engageable means as said beam approaches the lower limit of its movement.

5. A mechanism for stripping mold shells from patterns, as set forth in claim 4, having means operative to move said mold-receiving means into and out of engagement with said brackets.

6. A mechanism for stripping mold shells from. patterns, as set forth in claim 1, in which said releasable latching mechanism comprises a plurality of pivoted arms, engageable means carried by said ejector plate-gripping mechanism, means operative to move said arms into engagement with said engageable means as said. beam approaches the limit of its movement in one direction, and means operative to move said arms out of engagement with said engageable means as said beam approaches the limit of its movement in the other direction.

7. A mechanism for stripping'rnold shells from patterns comprising a pattern-carrier having a pattern mounted thereon, an ejector plate slidably supported by said pattern-carrier in spaced relation thereto, a plurality of stripping pins secured to said ejector plate and extending into apertures in said pattern, a vertically movable mold receiving means below said pattern holder, means operative to move said mold-receiving means upwardly substantially into contact with said mold shell on said pattern, and means operative to move said mold-receiving means and said ejector plate downwardly in unison in a direction to project said stripping pins out through said apertures beyond the face of said pattern for stripping a mold shell from said pattern onto said mold-receiving means while maintaining said mold receiving means in supporting relationship to said mold shell.

EMERY I. VALYI.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,960,992 During et al. May 29, 1934 2,301,819 Sambrook Nov. 10, 1942 2,425,362 Cherry et a1. Aug. 12, 1947

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