US1506700A - Press - Google Patents

Description

Patented ug. 26, 1924i.

UNITED STATES istanti PATE-,NT orifice.

GEORGE E. WHITNEY, or BRIEGEPORT, CONNECTICUT, AssIGNoa To THE INTERNAi TIONAL PAVEMENT' COMPANY, or neutroni), CoNNECTiCUT, A CORPORATION or CONNECTICUT.

PRESS.

Application led April 14, 1922. Serial No. 552,487.

To @ZZ Iwhom t may concern:

Be it known that I, GEORGE E. WHITNEY, a citizen of the United States, and a resident of Bridgeport, in the county of Fairfield and 5 State or Connecticut, have invented an Improvement in Presses, ot' Which the following description, in Connection with the aeeompanying drawings, is a speciiication, like characters on the drawings representing like parts.

This invention pertains to improvements in presses for making compressed units from plastic masses. It has among its objects, the provision ot' a compact arrangement of a plurality oit instrumentalities for forming the units and one in Which the strains incident to the operation of the instrumentalities are reduced to a minimum. The invention7 however, will be best understood 'from :0 the following description When read in light of the accompanying drawing of one specilic embodiment ot my invention selected for illustrative purposes, While its scope will be more particularly pointed out in the appended claims.

In the drawings Fig. 1 shows a central longitudinal section of a` machine constructed according to my invention Fig. 2 is a section on the line 2-2 of Fig. 1;

vFig. 3 is a section on the line 3--3 of FigjQ;

ltig. is a detail ot' part ol' the mechanism n tor operating the plungers; and

Figs. 5, 6 and 7 are sections on the lines .f3- 5, 6 6 and 7 7 of Fig. 4:.

Referring to the drawings, Which show the n embodiment of my invention selected for .o illustration, I have indicated a mold press of the type shown in my Patent 1,003,561, granted to me September 19., 1911. The press now to be described in common with that shown in my patent includes a base upon which is positioned a cylinder 1 of cir cular cross-section and containing a vertically reciprocable piston of similar crosssection. ,This piston in my present invention is split longitudinally on a diametrical io plane into two equal rams 3 of the same ei fective cross-sectional area. Each ram is used for pressing material in a mold to be described.

Rising from the cylinder 1 are columns i5 5, which support a bulkhead 7 above the cylinder. The columns in my present em bodiment are our in number andare 'uni'- formly distributed aroundthe cylinder.`

is disclosed in my patent above 'referred to, in the bulkhead I support a mold block 9 on Whichis mountedthe sliding head 11. In my presentinvention the mold block'is provided with a plurality of mold chambers 13 of number corresponding to the number ot rams 3 and as 'herein shown tWo such mold chambers and Arams are provided.

Cooperating with the mold chambers 13 are mold plungers'l, each of 'which carries a plunger capv 1X7, which lits a mold chamber and reciprocates therein.

rIlhe mold plungers'are supported on the ejecting heads 19, being separated therefrom by the distance blocks 21 and secured thereto by meansof the tie bolts 23. The ejecting heads 19 are movable relatively to the rams7 being for this purpose supported tor reciprocation on the ejecting head guides 25. The ejecting head guides are carried on the rams and are secured thereto by means of stud bolts Q7 (Fig. 1) carried by the` rams and passing through the flanges 29 ofthe ejecting head guides. For convenience in assembly, the ejector heads are split on longitudinal planes to provide tivo parts which are secured together by means of bolts 3l passing through the ears 33 carried by the ejector heads.

In my present invention I have shown the sliding head 11 provided With a central 1ocated diaphragm 35, which divides the through passage of said head into a plurality of passages each leading to a mold chamber 13. Extending through the through passage of the sliding head is a feed neck v37 Which leads from a hopper or other suitable source of supply of plastic material to be fed to the chambers.

is Will be understood from my patent above referred toj the sliding head is reciprocated to open the mold chambers and permit the plastic material to enter said chambers, the parts under these conditions beingv in the positions illustrated by Fig. Q. After the mold chambers are charged with material the sliding head is moved to close. the molds, whereupon the rams are lcaused to rise to force the plungers 15 into the mold chambers and compress the material therein. The sliding head is then given a furtherl movement in the same direction yso as to uncover the mold chambers, whereupon the plungers are further raised in the same direction from the intermediate position just described to a final position which acts to force the contents of the mold chambers out of said chambers. The sliding head and plunger are then again moved into the initial position illustrated by Fig. 2 and the operation repeated.

For causing actuation of the rams the space beneath the same is filled with a liquid,

' the pressure of which is caused to be raised and lowered by the reciprocations of the displacement member 39.` The liquid tends to escape around the outer surface of the rams, which tends to press the rams toward eachv other and thereby prevent relative movement between them. To eliminate this effect I so form the adjacent surfaces of the rams as to provide the chamber 41 which extends' entirely across the cylinder and into which liquid may find its way and act outwardly to oppose the inwardly acting pressure. The contacting` surfaces of the rams above and below the chamber 41 are ground to provide as nearas possible a fluid tight joint. It will be understood, however, that I may admit pressure liquid to the chamber 41 by conduit means other than that'shown or if desirable may employ other means for neutralizing to the desired extent the pressure of the liquid against the outer surfaces of the rams by admitting liquid between them.

For moving the plungers to eject the material from the molds I provide the arms or levers 43, one being provided for each ejector head and the two being loosely mounted in side by side. relation on a rock shaft 45.` This rock shaft is journalled in brackets 46 (Fig. 1) which are supported in any convenient manner to a fixed part of the machine, and is oscillated by means of the lever 47 which is fixed to the rock shaft and carries at its end a 'cam roller 49 cooperating with the camV 51. The lever 47 is provided with an arm 52, which is located beneath a lug 53 carried by the upper arm 43 as viewed in Fig. 6. The shaft 45 also carries in fixed relation thereto an arm 55 similar to the arm 52 of the lever 47, the arm 55 being positioned beneath the lug 53 of the lower arm 43 as viewed in Fig. 6. It' will be noticed by this construction that when the cam 5l is in operation, the lever' 47 rocks the shaft 45, which causes the arms 43 to oscillate.

Each arm 43 carries at its end a pivoted block 57 in contact with the under face 59 lof the ejecting heads. It will thus be noted that the blocks 57 and arms 43 constitute an abutment for determining the lowermost position of the mold plungers and therefore determine the amount of material which may pass into the mold chambers.

For determining the lowermost position of the blocks 57 the arms 43 are perforated at 61 and through the perforations are passed rods 63 each of which carries at its lower end a buffer spring 65 supporting a buffer plate 67. The arms 43 in their lowermost position rest on the buffer plates.

For adjusting the abutments afforded by the buffer plates 67, each rod 63 has secured to its upper end an eccentric strap 69 cooperating with an eccentric 71. Rotation of the ecceiitrics in an obvious manner acts to raise or to lower the buffer plates 67. For supporting the eccentrics 71 and for rotating them, one of said eccentrics, namely the lower eccentric as viewed in Fig. 5 is carri ed by a sleeve 73, while the upper eccentric is carried on Va shaft 75 which passes through said sleeve. The shaft is journalled in a bearing 77 carried by one of the columns while the sleeve is journalled in a similar bearing 77 carried by an opposite column 5. The end of the shaft 75 projects beyond the sleeve and carries an arm 79, while the adjacent end of the sleeve carries a similar arm 81. Each arm 79 and 31 carries at its end and in pivotal relation the-reto a nut 83. Through each nut 83 eX- tends the screw threaded end 85 of a rod 87 which is held against longitudinal movement by a thrust collar 39 carried by a fixed part of the machine and which rod may be rotated by means of a hand wheel 91. it will thus be seen that by means of the hand wheels 91, the operator may, whether the press is in operation or not, adjust the lowermost position of either of the plungers and thereby determine the amount of material that passes into the mold chambers.

It will be understood that when the arms or levers 43 raise the mold plunger-s to eject the compressed material from the molds, the movement of said plungers must be sufficient to raise the material to the upper edges 92 of the mold chambers in order that the sliding head may carry the compressed material away from the mold chambers. To compensate for variations in the thickness of the plunger caps 17 and to adjust them with relation to the upper edge 92, each lever 43 carries a wedge 93 which is dovetailed at 95 into the lower side ofthe lug 53 of said levers. Each wedge 93 carries an upstanding end portion 95 through which passes a stud bolt 97 secured to the side of the lug 53 as is clearly illustrated by Fig. 4. rlhe lower faces of the wedges rest on semi-cylindrical blocks 99. carried in semicylindrical recesses 101 on the arms 55. Extending through each block 99 are a pair of bolts 103, which by means of the springs 105, act to yieldingly hold the blocks in the recesses 101. It will be vnoted that as I provide a rocking support for the blocks 99, the upper surface of said blocks will always present a maximum of area in contact with the lower surface of the wedge It will be noticed that by the abo-ve construction l have provided a compact arrangement for compressing material into a plurality of closely adjacent molds and one which permits the bulkhead and other parts to be of minimum size and that by concentrating the thrust against the bulkhead, the same need have but a minimum span.

Although l have described for purposes of illustration one specific embodiment of my invention, it is to be understood that l am not limited thereby to its specific mechanical details but that within the scope of my invention wide deviations may be made therefrom without departing from the spirit of my invention.

Claims:

l. ln a fluid actuated press, a cylinder, and a plu lality of material operating rams in said cylinder and having surfaces in contacting relation.

2. In a fluid actuated press, a cylinder, a. plurality of rains in said cylinder, and said rams being arranged exteriorly to each other and having surfaces in contacting relation.

3. ln a fluid actuated press, a cylinder having a closed and an open end, a plurality of rams in said cylinder and extending through said open end, and said rams havino' surfaces in contacting relation.

et. n a fluid actuated press, a cylinder having a closed and an open end, a plurality of rams in said cylinder and extending through said open end, and said rams being arranged exteriorly of each other and having surfaces in contacting relation.

5. ln a fluid actuated press, a cylinder of circular cross section, a plurality cf rams in said cylinder, said rams jointly conforming to the cross section of said cylinder and conforming to each other on radii of said cylinder.

6. ln a mold press, a mold block having plurality of closely adjacent mold chambers, plungers for said chambers, a cylinder belenv said mold block, rams in said cylinde: for operating said plungers, and said rams being each disposed beneath a mold chamber.

i. ln a mold press` means providing plur lity of closely adjacent mold chambers, a cylinder symmetrically aligned with the tot-al of iid chambers, a piston. in said cf.'L indcr, .sa-id pistou beingdivided into a plurality of rains of number corresponding to t ie number of mold chambers and on longitufj' planes extending` between said mold chambers, andmeans for causing said rams to operate on the material placed in said mold chambers.

ln a mold press, a base comprising a cylinder, a bulkhead above said cylinder, columns for supporting said bulkhead, a plurality of mold chambers at said bulkhead, and rams in said cylinder for compressing material in said molds.

9. ln a mold press, a base comprising a cylinder', a lnilkhead above said cylinder, columns for supporting said bulknead, a plurality of mold chambers at said bulkhead, and rams of equal area in said cylinder' for compressiiwy material in said molds.

l0. ln mold press, a base comprising a cylinder, a bulkhead above said cylinder, columns disposed around saidv cylinder for supporting' said bulkhead, a plurality of mold chambers at said bulkhead, and rams in said cylinder for compressing material in said molds.

ll. ln a fluid actuated press, a cylinder, a piston therein divided longitudinally on diametrical plane into two rains, means for subjecting` said rams to fluid pressure, and means for opposing the force of such fluid tending to press said rains together'.

l2. In a fluid actuated press, a cylinder, a piste-n therein divided longitudinally on a diametrical plane into two rams, means for subjecting said rams to fluid pressure, and fluid pressure means for opposing the force of such fluid tending to press said rams together.

13. ln a fluid actuated press, a cylinder, a piston therein divided longitudinally on a diametrical plane into two rams, means for subjecting said rams to fluid pressure, and one of said rams being cut awajv to pro vide a chamber on its side adjacent the other ram.

lll. ln a fluid actuated press, a cylinder, a plurality ot rams with surfaces in contact and jointly fitting said cylinder, and means tending to force said. rams away from each other.

l5. ln afluid actuated press, a cylinder, a plurality of rams with surfaces in contact and jointly fitting szid cylinder, and fluid pressure means tending to force said rams away from each other.

16. ln a fluid actuated press, a cylinder.r a plurality of rains with surfaces in contact and jointly fitting said cylinder` and a chamber formed in the contacting siuface o-f one of said rams.

17. In a 'fluid actuated press, a cylinder, plurality of rams jointly fitting said cylinder, chambers formed between 'the facing portions of said rams, and said rains being so shaped and the chambers se arranged and of such size that the inwardly actingi pressure between the cylinder' and said rams is to some extent neutralized.

18. ln a uid actuated press, a cylinder, a piston divided longitudinally on radial planes into a plurality of rains, and one of the contacting surfaces of each of said rams having a chamber formed entirely across said suriace and located intermediate thc ends oil said ram.

19. ln a mold press, a plurality of closely adjacent ma `erial receiving` chambers, plungcrs Jror operating upon the material in said chambers, rams for actuating each plunger, and a common cylinder for said rams.

20. ln a mold press, a plurality of closely adjacent material receiving chambers, plungers iior operating upon the material in said chambers, rams of equal ei'lective area for actuating each plunger, and a common cylinder for said rams.

2l. ln a mold press, a mold having a piu- A'ality of chambers 'for receiving material to e molded4 plunger 'for each chamber, a n for each plunger, a common cylinder' for the rams, and the effective areas oit` said rams bearing to each other the same ratio that the material capacity oit' the chambers bear to each other.

ln a mold press, a mold havinsy a plurality oi chambers for receivingmaterial to be molded, separate rams for causing the material in said chambers to be operated upon and having effective areas corresponding to the material capacity oi said chambers, and a common cylinder -for said rams,

23. In a mold press, a cylinder, a plurality o'lI rams in contact and filling said cylinder, a iixed body of liquid beneath said rams, a displacement means ior said liquid, and mold compressing' means actuated by said rams.

24. In a mold press, a plurality of mold chambers, plungers for said chambers, common operating means for said plungers, and means for Varying the stroke oione plunger relatively to the remainder oi2 said plungers.

25. In a mold press, a plurality' of mold chambers, plungers for said chambers, common operating means for said plungers, and means for varying the stroke of one plunger Without varying the stroke oit' the remainder of said plungers.

26. In a mold press, a plurality of mold chambers, plungers for said chambers, common operating means for said plungers, and means for varying the stroke of each of said plungers Without Varying the strokes of the remainder of said plungers.

27. ln a mold press, a plurality oi mold chambers, plungers for said chambers, rams for operating said plungers, a common liquid containing cylinder for operating said plungers by rise and fall of pressure of said liquid, and means for varyingv the stroke oiI said plungers.

28. In a mold press, a plurality of mold chambers, plungers for said chambers, rams for operating said plungers, a common liquid containing cylinder for operating said plungers by rise and tall of pressure of said liquid, and means for varying the stroke' oi" one plunger yrelatively to the remainder oi" said plungers.

29. In a mold press, a plurality of mold chambers, plungers for said chambers, rams for operating said plungers,'a common liquid containing cylinder foroperating said plungers by rise and tall of pressure or' said liquid, and means 'for varying the stroke oi one plunger Without Varying the stroke ot the remainder ot said plungers.

30. ln a mold press, a plurality o' mold chambers, plungers tor said chambers, rams for operating said plungers, a common liquid containing cylinder for operating said plungers by rise and fall of pressure or' said liquid, and means for Varying` the stroke 0i each of said plungers Without Varying the strokes of the remainder oi said plungers.

3l. ln a mold press, a plurality of mold chambers,plungers for said chambers, liquid pressure operated rams for operating said plungers, and a common displacement means for raising and lowering the pressure vor the liquid for operating said rams.

ln a mold press, a plurality of mold chambers, plungers for said chambers, liquid pressure operated rams for operating said plungers, common displacement means for raising and lowering the pressure of the liquid for operating said rams, and means for Varying' the stroke oit each plunger.

33. ln a mold press, a plurality of mold chambers, plungers :tor said chambers, liquid pressure operated rams for operating said plungers, common displacement means for raising and lowering the pressure of the liquid for operating said rams, and means tor Varying the stroke of each plunger Without Varying the stroke of the remainder.

In a mold press, a plurality of mold chambers, plungers tor said chambers, liquid pressure operated rams for operating said plungers, common displacement means for raising and lowering the pressurerof the liquid ior operating said rams, and means for varying the stroke of each plunger While the press is in operation.

In a mold press, a plurality of mold chambers, plungers for said liquid pressure operated rams for operating said plungers, common displacement means for raising and lowering the pressure of the liquid for operating said rams, and means for varying the stroke of each plunger Without varying the stroke of the remaining and While the press is in operation.

36. ln a mold press, a plurality of mold chambers, a plunger for each chamber, a ram for each plunger, a common cylinder containing a fixed body of liquid for said rams, moving displacement means for said liquid, and means for varying the stroke of each of said plungers.

37. In a mold press, a plurality of mold chambers, a plunger Jfor each chamber, a

chambers,

ram for each plunger, a common cylinder containing a fixed body ol' liquid for said rams, moving displacement means tor said liquid, and means 'for varying the stroke ot each ot said plunger-s without varying the strole ct the remainder ot said plungers.

9 In a mold press, a plurality or mold chambers, a plunger 'for eacn chamber, a ram tor each plunger, a common cylinder containing a fixed bodyv oi?A liquid tor said moving displacement means tor said liquid, and means t'or varying the stroke o' each ci said plungers, While the press is in operation.

In a mold press, a plurality or" mold chambers, a plunger i'or each chamber, a ram for each plunger, a common cylinder containing a iii-ed body ot liquid tor said rams, moving displacement means tor said liquid, and means tor varying the stroke ot each ot said plungers, Without varying the stroke of the remainder and while the press is in operation.

l-O. In a mold press, means providing a pluralityr oi' mold chambers, plungers tor said chambers, rams tor operating said plungers, said rams being positioned in a common cylinder containing liquid, displacement means for said liquid for causing said plungers to compress the material in said mold chambers, and means tor moving said plungers relatively to said rams tor ejecting the compressed .material trom said mold chambers.

Ll-l. In a mold press, means providing a plurality of mold chambers, plungers Jfor said chambers, tluid operated means comprising a plurality of rams in a coniimon cylinder ior movingl said plnngers tor compressing material in. said mold chambers, and means for moving said plungers in the same direction :tor ejecting the compressed material from said mold chambers.

42. In a mold press, means providing plurality of stationary mold chambers, a plunger for each chamber, liquid operated rams for moving said plungers, a common displacement means for the liquid 'tor said rams and operative to cause said plungers to compress the material in said mold chambers, and means tor moving said plungers relatively to said rams for ejecting the compressed material trom said mold chambers.

43. In a mold press, means providing a plurality oit stationary mold chambers, plungers for each chamber, liquid operated means for giving said plungers a movement for compressing material in said chambers, a common displacement means tor said liquid, and means for giving said plungers a movement in the same direction tor ejectinsz,` the compressed material from said mold chambers.

44. In a mold press, means providing a. plurality of stationary mold chambers, a

plunger for each chamber, liquid operated rams tor moving said plungers for compressing material in said mold chambers, a common displacement means iforrthe liquid 'tor said rams, means for moving saidplungers relatively to said rams tor ejecting the compressed material 'from said mold chambers, and means ior varying the stroke of said plungers independently ot the stroke of said rams.

45. In a mold pressmeans providing a plurality of mold chambers, ay plunger for each chamber, liquid operated rams for moving said plungers tor compressing material in said mold chambers, a common cylinder for said rams, displacement means for said cylinder, means tor moving said plungers relatively to said rams tor ejecting the compressed material i'rom said mold chambers, and means Jfor varying the stroke of' said plungers independently of the stroke of said rams.

46. In a mold press, means providing a plurality of stationary mold chambers, aplunger for each chamber, liquid operated rams for moving said plungers for compressing material in saidv mold chambers, a common cylinder for said rains, displacement means for' said cylinder, means for moving said plungers relatively to said rams for ejecting the compressed material from said mold chambers, and means for varying the stroke of said plungers independently oi? the stroke of said rams.

il?. In a mold press, means providing a plurality or" mold chambers, plungers for said chambers; said plungers" having an initial position in Which said chambers are charged With material, an intermediate position in which said plungers have compressed said material and a linal position inl Which the compressed material is ejected from said chambers; rams having a common cylinder with liquid displacement means for moving` said plungers from said initial to said intermediate position, and means for moving said plungers from said intermediate to said iinal position and serving as an abutment for said plungers in their initial position.

48. In a mold press, means providing aplurality of mold chambers, plungers for said chambers, said plungers having an .initial position in which said chambers are charged with material, an intermediate position in which said plungers have compressed said material and a linal positionl in which the compressed material is ejected trom said chambers; rams-having a common cylinder with liquid displacement means for moving said plungers from said initial to said intermediate position, means for moving said plungers from said intermediate to said nal position and servingas an abutment for said p'u-ng'erstheir' initial position, and said last named means being adjustable for varying the initial and nal position of said plungers.

49. In a mold press, means providing a plurality of mold chambers, plungers tor said chambers; said plungers having an initialv position in Which said chambers are charged with material, an intermediate position in which said plungers have compressed said material and a linal position in which the compressed material is ejected from said chambers; rams having a common cylinder With liquid displacement means for moving said plungers from said initial to said intermediate position, means for moving said plungers from said intermediate to said final position and serving'as an abutment for said plungers in their initial position, and said last named means being adjustable for varying the initial position of said plungers.

50. In a mold press, means providing a plurality of mold chambers, plungers for said'chambersisaid plungers having an initial position in -vvhich said chambers are charged with material, an intermediate position in which said plungers have compressed said material and a final position in which the compressed material is ejected from said chambers; rams having a common cylinder With liquid displacement means for moving said plungers from said initial to said intermediate position, means for moving said plungers trom saidr intermediate to said iinal position and serving as an abutment for said plungers in their initial position, and said last named means being adjustable for varying the iinal position ot said plungers.

51. In a mold press, means providing a plurality of mold chambers, plungers for said'chambers; said plungers having an initial position in which said chambers are charged With material, an intermediate position in Which said plungers have compressed said material and atinal position in which thecompressed material is ejected from said chambers; rams having acommon cylinder Wit-h liquid displacement means t'or moving said plungers from said initial to said intermediate position, means for moving said plungers from said intermediate to said tinal position and serving as an abutment for said plungersfin their initial posi,- tion, and said last named means being adjustable to vvary either the initial or final position of said plungers,

52.In a mold press, means providing a plurality oi mold chambers, plungers nfor saidchambers, said plnngershaving aninitial positionl in Which said chambers are charged with material, an intermediate position in which said plungers `have compressed said material and a final position in which the compressed material'is ejected from said' chambers; rams having a common cylinder with liquid displacement means tor moving said plungers from said initial to said intermediate position, means Jfor moving said plungers from said intermediate to said linal position and serving as an abutment tor said plungers in their initial position, and said lastnamed means being adjustable to vary one or more positions of said plungers.

53. In a mold press, means providing a plurality of moldehambers, plungers vfor said chambers; said plungers having an in-v itial position in which said chambers are charged with material, an intermediate position in Which said plungers have compressed said material and a final position in which the compressed material is ejected from said chambers; rams having a common cylinder With liquid displacement means for moving said plunger-s from said initial to said intermediate position, means for moving said plungers from saidintermediate to saidv iinal position and serving as an abutment for said plungers in their initial position, and said. last named means being adjustable to vary one or more positions of said plungers independently of the respective positions of the remainder ot said plungers.

54. In a mold press, means providing a plurality of mold chambers, plungers tor said chambers; said plungers having an inT itial position in Which said chambers are charged with material, an intermediate position in which said plungers have compressed said material and a .tinal position in which the compressed material is ejected from said chambers; rams having a common cylinder with liquid displacement means for moving said plungers from said initial to said intermediate position, means for moving said plungers from said intermediate to lsaid final position and serving as an abutment tor said plungers in their initial position, and said last named means being adjustable to vary one or more positions of any of said plungers independently of the respective positions of the remainder of said plungers.

55. Ina mold press, a mold block having a plurality of closely adjacent mold chambers, a sliding head having an opening therethrough, one or more dlaphragmsV in said opening for dividing it into, passages leading to said mold chambers, and a single feed neck in communication with 4saidpassages.

56. In a mold press, means providing a mold chamber, a plunger :for said chamber: said plunger having an initial position in which said mold chamber is charged With material, an intermediate position in Which said materialis compressed said plunger, and a linal position in which said compressed material is ejected by said plunger from said mold chamber, means tor moving said plunger from its initial to its intermediate position, a roelr shaft, a lever operated by said rook shaft for moving said plunger 'trom its intermediate to its linal position, and determining its initial position, and means independent ot' said roel: shaft and operative While the press is in operation for varying that limit of motion ot' said lever which determines the initial position ot said plunger.

57. ln a mold press, means providing a mold chamber, plunger for said chamber; said plunger having an initial position in which said mold chamber is Charged with material, an intermediate position in which said material is compressed by said plunger, and a final position in which said oompressed materia"` is ejected by said plunger 'from said mold Chamber, means for moving said plunger trom its initial to its intermediate position, a roolr shaft, a lever operated by said rook sliait tor moving said plunger from its intermediate to its final position, and determining its initial position, and means independent oitl said rook shaft and for varying the amplitude ot movement ot said lever.

58. In a mold press, means providing a mold chamber, a plunger for said Chamber; said plunger having an initial position in which said mold chamber is charged with material, an intermediate position in which said material is compressed by said plunger and a final position in ivhieh said oompressed material ejected by said plunger from said mold chamber, means for moving said plunger `from its initial to its intermediate position, a roolr shaft, a lever oseillated by said rook shaft for moving said plunger from its intermediate to its final position and for determining its initial position. and means iifidepondent of said rook shaft and for varying the throw of said lever While said press is in operation.

5911i a mold press` means providing mold Chamber, a plunger for said chamber; said plunger having an initial position in which said mold chamber is charged With material, an intermediate p0- sition in vvhieh said material is compressed by said plunger, and a linal position in which said Compressed material is ejected by said plunger from said mold chamber, means for moving said plunger trom its initial position to its intermediate position, a rook shaft, a lever oseillated by said rook shaft for moving said plunger 'from its intermediate to its final position and for determining its initial position, and means independent oi said rook shaft and for varying that .limit of motion of said lever which determines the initial position of said plunger.

60. In a mold press, means providing a mold chamber, a plunger for said chamber; said plunger having an initial position vin which said mold chamber is' charged with;

material, an intermediate"position in which said material is compr Ned by said plunger, and a i'inal position in which said oom pressed material is ejected by said plunger trom said mold chamber, means tor moving f trom its ini'tiai to its intermel a roel: shaft, a lever oseilrook shaft for moving said plunger trom its intermediate to its final position and for determining its initial position, and means independent of said roeli shat't and for varying While. said press is in operation that limit oit motion ot said lever which determines the initial position ot said plunger.

6l. ln a mold press, means providing a mold chamber, a plunger for said chamber; said plunger having an initial. position in which said mold chamber is charged with material, an intermediate position in which said material is compressed by said plunger, and a final position in which said oompressed material is ejeoted by said plunger from said mold oh amber, means tor moving said plunger trom its initial to its intermediate position, a rook shaft, a lever oseillated by said rook shatttor moving said plunger from its intermediate to its final position and tor determining its initial position, and adjustable means independent of said rook shaft and for varying that limit ot motion ot' said lever Which determines the final position of said plunger and tor adjusting While said press is in operation that limit oit motion ot said lever Which determines the initial position of said plimger.v

62. n a mold press, a plunger for the mold thereof, a ram tor operating said plunger tor compressing material in said mold, a lever for giving said plunger movement relatively to said rain for ejeoting material trom said mold, a rook shaft for operating said lever, and means independent of said rook shaft 'for adjusting the extent ot motion imparted to said lever by said rook shaft.

63. In a mold press, means providing a plurality of mold chambers, plungers tor said chambers, separate levers tor moving said plungers, a common operating means for said levers, and means for independently adjusting the range ot movement ot said levers.

64. ln a mold press, means providing a plurality of mold chambers, plungers for said Chambers, a rook shaft, means for oseillating said rook shaft, a pair of arms earried by said roel( shaft `tor moving said plungers, and means tor independently adjusting the angular relation oit said arms to said rook shaft.

65. In a mold press, means providing a plurality ott mold chambers, plungers for said chambers, a rock shaft, means for oscillating said rock shaft, arms loosely mounted on said rock shaft and each arranged for moving a plunger, and means for adjusting` said arms relatively to said roclr shaft.

G6. In a mold press, means providing a plurality of mold chambers, plungers for said chambers, a rock shaft, means for oscillating said rock shaft, arms loosely mounted ou said rock shatt and each arranged for moving a plunger, and other arms carried by said rock shaft and each abutting one of said first arms.

67. In a mold press, means providing a plurality of mold chambers, plungers for said chambers, a roch shaft, means :tor oscillating said rock shaft, arms loosely mounted on said rock shaft and each arranged for moving a plunger, other arms carried by said rock shaft, and an adjustable motion transmitting means between each of the last named arms and one of the first named arms. 68. In a mold press, means providing a plurality of mold chambers, plungers for v said chambers, a rock shaft, means for oscillating said rock shaft, arms loosely mounted on said rock shaft and each arranged Jfor moving a plunger, other arms carried by said rock shaft, each of said last named arms acting to move one of the first named, and an adjustable wedge inserted between each of the arms so moved and the arm Jfor moving it. i

69. In a mold press, a plurality of mold chambers, plungers for each o't said molds, an oscillating lever for operating each plunger, and, an independently adjustable abutment directly engaging each lever and for determining the extent of withdrawal of said plungers from said chambers.

70. In a mold press, a plurality of mold chambers, plungers for each of said molds, an oscillating lever for operating each plunger, an adjustable abutment for each lever, and rotatable eccentrics for adjusting said abutments.

71. In a mold press, a plurality of mold saidabutments while said press is in operai tion.

T8. In a mold press, a plurality of mold chambers, plungers for each of said molds, an oscillating lever for operating each plunger, an adjustable abutment for each lever, and rotatable eccentrics for independ-v ently adjusting said abutments while said press is in operation.

Til. In a mold press, means providing closely adjacent mold chambers, a plunger 'for each chamber for operating on the ma terial therein, and a single fluid pressure mechanism for operating the plungers and allowing any plunger to move under the influence of said mechanism a greater distance than the remainder of said plungers.

75. In a mold press, means providing closely adjacent mold chambers, a mold plunger `for compressing material ineach chamber, and iiuid pressure mechanism comprising a single press cylinder for operating all of said plungers.

76. In a mold press, means providing closely adjacent mold chambers, a mold plunger for compressing material in each chamber, and fluid pressure mechanism comprising a single press cylinder for operating the plungers and allowing any plunger to move under the influence of said mechanism a greater distance than the remainder of said plungers.

In testimony whereof, I have signed my name to this speciiication.

GEORGE E. WHITNEY.

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