US1536201A - Press - Google Patents

Description

may 5, 1925. 1,536,201

B. M. FINE nmss Filed March 2, 1925 4 Sheets-Sheet 1 B. M. FINE mass Filed March 2, 1923 4 Sheets-*Sheet 2 11 Y 1 .1 zz 40 10 17 l L k 2 A fir?- M w 17 I ml it v 49 is I V I; 1 N 17 .2. x

May.5.':;.11925.. r 1,536,201

Y I M. FINE Piwss' Filed March 2, 1923 -4 Sheets-Sheet 3 V/IIIIIIIIIIIIIIIIIIIIIIIIIIIA 'I III] Ill 7 II k k\\: A; I I II 1/! (I? 4 1 I z I 7? 66 '69 4 i I I I a 7 I I '67, g Z J 0 1' g A I :21 s I 20 Z M I V//// f May 5, 1925.

B. M. FINE PRESS Filedllarch 2, 1923 4 Sheets-Sheet 4 uicis I l l I I I I l l l l I ll u v w W 5 Patented May 5, 1925.

UNITED star-Es 1 arr-NT or -F1 on. it

BEBNKR W M; FINE, 'os rHrLADELPHIA, "PENNSYLVANIA.

PRESS.

To an whom it-army come 1 71 Be it'lrnown that I, BERNARD M. FINE, a citizen ot tl'ie United States, residing at Philadelphia, Pennsylvania, have invented certain-mew and-useful Improvements in Presses, of which I declare the following to be a full, clean-and exact description.

My invention relates to improvements in presses and has to do, more particularly, with. pressesof "the'general type employed for repressingbricks,;or similar material, which have been roughly formed in a pre vious operation.

Practicallyall presses in use, at the present ti1ne,for repressingbricks are hand operated'andaro very slow and inefficient in operation. Theoperator-moves a closure to one side, opening the mold chamber grasps a brick to be pressed, inserts it in the mold cl ian'lber, moves the closure to position 'to close the-moldchamber, operates the -liand-lever which applies"pressnrmto the brick in theinold c'hambeninoves the closure to one side to openthe mold chamberyand then-removes the pressed brick. These many handoperations slow downthe operation of the machine and decrease its output very imiterially. I

The chief object of mv'invention is to provide -a press, suitable for repressing, brick, which is largelyautomatic in operation so thatthe output i'rom such' a inaclline is largely increased overthatjpossible with prionmachines and the cost of operation is reduced. A; fin'ther object of'iny invention is to provide a power-actuated.press which is set in motion aiitomati-cally, when the closure for themold chamber-is moved to closed. position. i I

A further object of my invention is to i provide ap ress bifthis character in which the power is automatically disconnected aft-er apredetermined movement ofthe pres sure mechanism.

Another object oi my invention is to provide a; press "ofthe kind described in which the power is automatically disconnected from the pressure mechanism when the closure 13m theimold chamber is in open positiion. Q i

i it further, object ot niy"invention is to qnoiide a. press of the general character describedincludinga mold chamber and a inovable closure for such mold chamber :Appliation filed March-2, 192s. -Seria1 nmezazee.

which is moved toward tlieinolcl chamber driven brick press of the kind described,

which may be movedvery easily from place to place With reference, for instance, to a pile ofjbricks which are to be run through the press.

Another object of my invention is to provide a press which has a slow motiondnring a. part of the stroke "and 'a' faster motion duringanother. part of the stroke.

-Fui1'ther objects, and objects relating todetails and jeconomies of operation and construction, will defin tely appear from the detaileddescription to follow. In one'instance, I accon'ip'lish the objects of my invention bythe devices and means set forth in the accompanying specification. is clearly defined "and pointed out in the appended claims. 'Astructure constituting a preferred embodiment of "my nvention is illustrated '1n tlie' facco1npany1ng drawings,

forming a part of this specification, in which Fig. 1 isa view, in 'sid'eelevation, of a machine embodyin -any invention, part of the frame being broken away -to show the gearing. s

Fig.2 is a hori'Zontahsectional view, taken onthe line 2 2 of, Fig; 1.

Fig, 3 is a vertical, sectional view, taken onthe line 33 of Fig. 1,the drivingmotor andfly wheel being shown in full lines.

Fig. tisa longitudinal, sectional view on the line 4'4 offFigQfQ.

Fig. fiisalongitudinal, sectional View on the line 55 of Fig. 2. i

Fig; 6 is a view; corresponding to the left hand part otFig.'1,showinga modified form of my invention, and

Fig. '7 is af vertical, sectional view on the line 7-7of Fig. 6.

In the draw l ps, the same reference mu'neralsrefer to the same parts throughout the several'vie'ws, and the sectionalviews are talrenlookingdn the direction of the arrows at the ends oi? the section lines.

Referring to the numbered partstf the drawings, 1 have illustratedaniachine em bodying my invention and including a My invention framework, 10, mounted upon supporting wheels or rollers, 11, so that it may be moved from place to place without difficulty. This framework carries a part, 12, forming the side walls of the mold chamber. The bottom wall of the mold chamber is formed by the head, 14, of the plunger, 13, which is mounted so as to be reciprocated within the mold chamber. The top wall of the mold chamber is formed by a closure plate, 15, which is carried by a closure yoke, having the legs, 17, and the cross member, 16. The closure plate, 15, and the plunger, 13, are moved toward each other in the operation of the machine in order to exert pressure upon the brick, or other material to be pressed, which is confined in the mold. chamber. To secure such movement of the parts, the legs, 17, of the closure yoke are pivotally connected to the actuating lever, 23, and the lever, or a part carried by it, engages the. lower end of the plunger to exert an upward pressure thereon. 1n the machine shown, the halfround bearing seats, 18, are formed at the lower ends of the legs, 17, fitting the laterally-extending trunnions, 20, on the actuating lever, 23. The bearing members, 19, have half-round seats complementary to the seats, 18, and these bearing members are yieldingly connected to the lower ends of the legs, 17, by the bolts, 21, which extend from the lower ends of the legs, 17, through the bearing members. it), and the springs, 22, disposed on said bolts between the members, it), and the nuts, 19, screwed on the ends of the bolts. The bearing seats, 18, and the members, 1%), together form l'iearings which receive the trunnions, 20, on the actuating lever and form a pivotal connection between the closure yoke and said lever. This counection is yielding, however, so that, in case an oversize brick is placed in the mold chamher, the connection between the lever and the closure yoke will yield and prevent the breaking of the machine. Notches, 26, are provided in the upper edge of the actuating lever which receive the trnnnions, 27, of a roller, 28, which bears against the foot, 29, on the lower end of the plunger, 13. A cross bar, 25, extends between the sides of the frame, 10, and serves as a, fulcrum for the lever, 23, when the closure plate, 15, is not in engagement with the top of the mold chamber. A nose, 2 1, at the end of the lever is adapted to engage said cross bar.

The lever, 23, is power-actuated, being operated by the driven shaft, 10, which is suitably journaled in the frame of the machine. This shaft is driven from the electric motor, 33, through a train of reducing gearing including the pinion, 35, on the armature shaft, 3%, the gear, 36, on the stub shaft, 37, which meshes with said pinion,

and the pinion, .2738, on said stub shaft, mesl1 ing with the gear, 39, fast on said shaft, -10. A bell-crank lever, @14, is loosely mounted on said shaft, 40, and one arm of said bellcrank is connected to the end of the actuating lever, 23, by a link, 30, which is pivotally connected to the actuating lever, at 31. and to the bell-crank arm, at 32. The bellcrank, 4 1, is connected to the shaft, 10, so as to rotate therewith, by suitable clutch mech anism. In the machine illustrated, this clutch mechanism comprises a disk, 41, which is fast on the shaft, l0, and provided with a plurality of peripheral notches, a2, and a pawl, 4-5, which is pivoted, at 4.8, to the arm 43, of the bell-crank, 44. This pawl has a head, 46, adapted to engage in any one o t the notches in the disk, 11, and the pawl is norn'ially held in such position that said head, 46, engages in one of said notches, by a spring, 75. The pawl is also provided with a tail. -17, by which it may be withdrawn from engagement in the manner to he described hereinafter.

It will be observed that, due to the pivotal connection between the closure yoke and the actuating lever, the former may be swung to one side to the position shown in Fig. 4, to permit the removal of the brick from the mold chamber. ltt is desired to provide means whereby the clutch mechanism between the shaft, -10, and the actuating lever, 23, is disconnected when the closure yoke is swung to the open position and whereby said clutch is automatically connected when the closure. yoke is swung to closed position. l have accomplished this by providing a trip, it), which is'slidably mounted in a portion, 50, of the frame, 10, so that, when the trip is projected, its nose is in position to engage the tail, -17, of the pawl when the latter is carried past by the rotation of the shaft, 10. This trip, 19, is normally held in projected position by a spring, 51, on the stem, extending rearwardly from said trip, said spring being compressed between the portion, 50, of the frame and the nut, 52 at the end of said stem. The trip, 49, carries a pin, 54:, which extends through a slot, 55, to the outside of the frame. A tripwithdrawing link, 56, is pivotally connected, at 57, with an arm, 58, depending from one of the bearing members, 19. This link extends forwardly and has an arm, 59, carrying an adjustable stop screw, (30, which is adapted to engage the pin, 54:, to hold the trip .in retracted position, when the closure yoke is in closed. position as shown in Fig. 1. hen the closure yoke is in open posi tion, the link is thrown forwardly, due to its connection with the arm, 58, so that the trip moves under the pressure of spring, 51. to projected position.

It is desirable to disconnect the clutch mechanism automatically after the belt crank has completed one revolution with the shat-t, 40. In order to accomplish this,

l have provided ai'i arm, 61, on the link, 56, which extends forwardlythrough a slot, 79, in "the casing, 76, enclosing the reducing gearing. An arm, (33, is fixed on the shaft, 10, andha's an ottseten'dfiM, which strikes the o it'setend, 62, of the 'arm,"6 l, when, the closure yoke is in. closed position. This lifts the link so that the stop screw, clears the pin, 54, and the trip, 49, is moved by "the spring, 51, to projectedposition in which it engages the tail,.i7, of the pawl and retracts the pawl. iVhen the closure yoke is in open position, the offset ends, (32 and 6t, occupy suc li positions with respect to eachv other that they'do not strike. At such times, the trip is always in projected position and it is not necessary "torthe arm, 63, to strike the arm, 61, and lift the link.

The removal ot the brick is facilitated by theknock-out, .65, having a stem, (36, sliding in the phinger, 13. This stem engaged by the lever, pivoted at 71, and extending through a slot, 68, in thebearinn 69, for

the plunger, 13, and a slot, 67, in the plunger.

The lever, 70, is actuated by a link, 73, con-.

nected to a foot lever, 7d, and held normally withdrawn by the spring, 72. j

llrom the toregoing deseriotion, the opera tion of the machine should be very readily understood. ii henth'e closure yoke is in the positionshown in, Fig. t,the brick or mate rial to be pressed is inserted in the mold chamber, 12. The closure yoke is then swung! to closed position; so thatthe closure plate. chises the top of" the mold. chamber. The brick rests uponthehead, 14, ot the plunger, i i. The movenmnt ot the closure yoke to closed position moves the link, 56, rearwardl v. causing); the stop screw. (30, to engage the pin, Zia-l, and withdraw the trip, 415), from 'n'ojecled position. TI hisreleases the pawl, as, and the spring, 75, causes it to engage in one oi? the notches ot thedisk, el-l. This connects the bell-crank, 44, to the shaft. 40, so. that it is caused to rotate therewith and the actuating lever, 23, is oscillated. its the shatt, 40, rotates, the oti'set end, (it, of the arm, 63, engages theotit'set end, 62;, ot the arm, 61. and lifts the link,- 56., releasing the trip. Thetrip moves-to projected position and engages and retracts'the pawhflti, when the latter comes; past, thus disconnecting the clutch mechanism and bringing: the actuating lever to rest. The operator now swings the closure yoke to open position and removes the. pressed brick, with the assist-- ance of thelknock'out. 65., Itis to be noted. that this machine is. largely automatic and all the operator has to do is to. swing the closure yoke to and from closed position, re-

move the pressedbrick and inserta new one to be pressed. The drive for the actuating lever iii-controlled by the positionot the closure for the mold chamber, and 1t 1S automatically connected when the closure is moved to closed position.

In somecases, it is desirable to have a slow motion for a part of the stroke ot the plunger in order to apply the final pressure to the material slowly. in such cases, in order to avoid slowing down the machine too much, I find it desirable to provide a taster motion for another part of the plunger stroke. Ihave accomplished this, in the present machine, by the modified construction shown in G and 7, in which I introduce a pair of elliptic gears in the train of reducing gearing leading to the driven shaft,

40. The gear, 89, instead of being on the shaft, 4:0, is mounted on a stub shaft, 80. to which is keyed the elliptic near, 81, meshing with the elliptic gear, Fast on the driven shaft, 41-0. As a result of this arrangement of nearing, the latter part of the pn-rssnrc stroke and the first part the return stroke are much slower than the first part of the pressure stroke and the last part of the return stroke. The connections between the driven shaft and the actuating lever may be the same as in the preferred form of my invention but I am not to be restricted to such arrangement.

I am aware that the machinedescribed in this specification may be changed considerably without departing from the spirit of my invention and, theretore, I desire to claim my invention broadly, as indicated by the appended claims.

Having); thus described my invention, what l: claim as new and usetul and desire to secure by Letters Patent is;

l. A press of the kind described comprising: a mold chamberadpated to receive the material to be pressed, means for ex.- ertiim a pressure upon the material in said mold chamber, driving mechanism for 210- Y tuatinn' said means. means for opening and closing the mold chan'iber, "and means tor automatically disconnectiim' said drivingmechanism when the mold chamber is opened. 7

2. A. press of the kind described C(Jlllr prising amold chan'iber adapted to receive the material to be pressed, a driven shaft, pressure means acting; on the material in said. chamber. operating connections be.- tween said shaft and said pressure means including a clntcln ieans for opening and closing said mold chamber. and means tor anton'iatically actuating said clutch to disconnect the pressure means from the driven shaft when. the moldehamber is opened.

A press of the kind described comprisinga mold chamber adapted to receive the material to be pressed,- means 'for opening and closing); said chamber, pressure means acting on the material in said chamber and including an actuating lever, a driven shaft, and means for actuating said lever from said driven shaft, said means being automatically rendered inoperative when the mold chamber is opened.

1-. A press of the kind described comprising a mold chamber adapted to receive the material to be pressed, means for opening and closing said mold chamber, pressure means acting on the material in said chamber, and including an actuating lever, a driven shaft, a crank arm mounted on said shaft and connected to said lever, and means connecting said crank arm to said shaft so as to rotate therewith, said means being automatically disconnected when the chamber is opened.

A press of the kind described comprising a mold chamber adapted to receive the material to be pressed, means for opening and closing said chamber, pressure means acting on the material in said chamher and including an actuating lever, a driven shaft, a disk fixed thereon and having a plurality of peripheral notches, an arm journaled on said shaft and having one end connected to said lever, a pawl carried by the opposite end of said arm and normally engaging in one of the notches of said disk, and means for automatically withdrawing said pawl from engagement with the disk when the mold chamber is opened.

6. A press of the kind described comprising a. mold chamber adapted to receive the material to be pressed, means for opening and closing said chamber, pressure means acting on the material in said chamber, a driven shaft, operating connections between said shaft and pressure means including a clutch, and means, operated automatically when the chamber is closed. for actuating said clutch to connect the shaft and pressure means.

7. A press of the kind described compris a mold chamber adapted to receive the material to be pressed, means for opening and closing said mold chamber, pressure means acting on the material in said chamber, and including an actuating lever, a driven shaft, and means for automatically connecting said lever to said shaft when the chamber is closed.

8. A press of the kind described comprising a mold chamber adapted to receive the material to be pressed, means for opening and closing said chamber, pressure means acting on the material in said chamber and including an actuating lever, a driven shaft, a crank arm journaled on said shaft and connected to said lever, and means automatically connecting said crank arm to the shaft to rotate therewith when the chamber is closed.

9. A press of the kind described comprising a mold chamber adapted to receive the material to be pressed, means for opening and closing said chamber, pressure means acting on the material in said chamber and including an actuating lever, a driven shaft, a disk fixed thereon and having a plurality of peripheral notches, an arm journaled on said shaft and having one end connected to said lever, a pawl carried by the opposite end of said. arm, and means for automatically moving said pawl into engagement with one of the notches of said disk when the mold chamber is closed.

10. A press of the kind described comprising a mold chamber adapted to receive the material to be pressed, means for opening and closing said chamber, pressure means acting on the material in said chamber, a driven shaft, means for auton'iatically connecting said shaft and pressure means when the chamber is closed, and means for automatically disconnecting said shaft and pressure means after a predetermined movement of the pressure means.

11. A press of the kind described comprising a mold chamber adapted to receive the material to be pressed, means for opening and closing said chamber, pressure means acting on the material in said chamber, a driven shaft, operating connections between said shaft and pressure means including a clutch, means, operated automatically when the chamber is closed, for actuating said clutch to connect the shaft and pressure means, and means, operated automatically after a predetermined movement of the pressure means, for actuating the clutch to disconnect the shaft and pressure means.

12. A press of the kind described comprising a mold chamber adapted to receive the material to be pressed, means for open ing and closing said mold chamber, pressure means acting on the material in said chamber and including an actuating lever, a driven shaft, means for automatically connecting said lever to said shaft when the chamber is closed, and means for automatically disconnecting the lever from said shaft after a predetermined movement of the lever.

13. A press of the kind described comprising a mold chamber adapted to receive the material to be pressed, means for opening and closing said chamber, pressure means acting on the material in said chamber and including an actuating lover, a driven shaft, a crank arm journaled on said shaft and connected to said lever, means automatically connecting said crank arm to said shaft to rotate therewith when the chamher is closed, and means for automatically disconnecting said crank arm from the shaft after a predetermined movement of the lever.

14. A press of the kind described c0ming and closing saidchamber, pressure means acting; on the material in said chamber, and

including" an actuating lever, adriven shaft, a disk lured thereon and having a plurality of peripheral notches,]an arm journaled on said shaft and having one, end connected to a said lever, a pawl carried by the opposite end oi? said arm, means forautomatically moving; the pawl intoengagement with one. of said notches when thechamber is closed, and means for automatically disengaging said pawl aft-er a predetermined movement of the actuatinglever.

15. A pre'ssot the kind described comprising; .amold chamber adapted to receive the material to be pressed, pressure means actiligg, on the material in said chan ber, ac-

tuatinp,- mechanism for said pressure means, and a movable closure for said chamber, said actuating mechanism being controlled by the position of said closure.

18.4%, press of the kind described comprising a mold chan'iber adapted to receive the nutterial to, be pressed, pressure means acting on the material in said chamber,

driving mechanism, actuating connections l'lOlJWQGI], said driving mechanism and said pressure means, and, a movable closure for said chamber; said actuating connect ons being controlled by the position of said closure. I

17. A, press ol the kind described co nprisine' a mold chamber adapted to receive the material to be pressed, pressure means acting: on the material in said chamber, a driven shaft, a lllOVLlllG closure for said chamber, and a clutch connecting said shaft and pressure means and controlled by the position of. said closure,

18. A. press of the kind described comprising a mold chamber adapted to receive the material to be pressed, pressure means acting on the material in said chamber and including an actuating lever, drivensha'li't,

a crank arm mounted'ou said shaft and connected to said lever, a clutch for connecting" said shaft and crank arm, and a n lovable closure for said chamber, said clutch be ng' controlled by the position of said closure.

19. A press of the kind described comprising a mold. chambena movable closure Forming one Wall of said chamber, a plunger ,tlorming another wall of said chamber, an

actuating lever connectedto move said closure and plunger toward each other, a driven shaft, and means foractuating said lever from said shaft.

20. A press of the kind described cemprising' a mold chambelga movable closure nil-rump one Wall of said chamber, a pluniforming another Wallet? saidchamber, an actuating lever connected to more said closurenndplunger toward each other, a

d v haft, a ds cr n a m warmed t said lever and adapted tobe connect-ed to rotate with said shaft.

21- A press of the kind described comprising a'mold chamber, a movable closure forming one. wall of said chamber, a plunger forming another all of -said chamber, Ian actuating lever connected to move sald closure and plunger toward each other, a driven shaft, a crank arm com ecredto said lever, and a clutch adapted to connectthe crank arm to rotate with the shaft.

A press of the k nd deseribed comtpr sing a mold chamber, a plunger fol-111mg the bottom Wallet said chamber, an actuating lever having a lateralhr-e nding trunnion, said lever and actiuiting plunger, a closurecarrying member j eld- .ingly journaled on said trunnion, a closure bottom wall oi said chai nber, an actuating lever having; a pair of laterally-extending trunnions, said lever engaging and actuating said plunger, a closure yoke straddling said chamber and having its'legs yieldinglyi naled on said trunnions, a closure said chamber, and means or actuating said lever. i

241:. A press of the kind described co n 'nisingl a mold chamber, aplunger forming the bottom wall of said chamber, an actuating lever having apair oflaterally-extendingtrunnions, saidlevcr engaging and. actuating said plunger, a closure yoke straddling said chamber, the lower end of 'e ch leg of said yoke having a bearing engaging one of said trunnions,'comp ementary bearing blocks, springs yieldingly holding said blocks in engagement with the trunnions and the ends of saidlegs, aclsurecarried by said yoke and forming thetop Wall of said chamb -n', and means for actuating said lever. i

A press of the kind described comprising a mold chamber, aplnnger forming the a ned v by said yoke and forming: the top wall of ing its legs pivotally connected to said lever, a closure carried by said yoke and forming the top wall of said chamber, a motor, and actuating connections between said motor and lever.

27. A press of the kind described comprising a mold chamber, a plunger forming the bottom wall of said chamber, a lever, engaging and actuating said plunger, a closure yoke straddling said chamber and having its legs pivotally connected to said lever, a closure carried by said yoke and forming the top wall of said chamber, a driven shaft, a crank arm connected to said lever, and means for connecting said crank arm to rotate with said shaft.

28. A press of the kind described comprising a mold chamber, a plunger forming the bottom wall of said chamber, a lever engaging and actuating said plunger, a closure yoke straddling said chamber and having its legs pivotally connected to said lever, a closure carried by said yoke and forming the top wall of said chamber, a driven shaft, a crank arm ournaled on said shaft and connected to said lever, a clutch connecting said crank arm to said shaft, and means for automatically engaging said clutch when the closure yoke is moved to chaniiber-closing position.

29. A press of the kind described comprising a mold chamber, a plunger forn'iii'ig the bottom wall of said chamber, a lever engaging and actuating said plunger, a closure yoke straddling said chamber and having its legs pivotally connected to said lever, a closure carried by said yoke and forming the top wall of said chamber, a driven shaft, a crank arm journaled on said shaft and connected to said lever, a clutch connecting said crank arm to said shaft, means for automatically engaging said clutch when the yoke ismoved to chamber-closing position, and means for automatically disengaging said clutch after a predetermined movement of the lever.

30. A press of the kind described comprising a mold chamber, a. plunger forming the bottom wall of said chamber, a. lever engaging and actuating said plunger, a closure yoke straddling the chamber and having its legs pivotally connected to said lever, a closure carried by said yoke and forming the top wall of said chamber, a driven shaft, a disk fixed on said shaft and provided with a plurality of peripheral notches, an arm journaled on said shaft and having one end connected to said lever, a pawl pivoted on the opposite end of said arm and adapted to engage in any one of the notches on said disk, a trip normally spring-pressed into position to engage the tail of the pawl and withdraw the latter from engagement with said disk, and means, actuated by movement of said yoketo chambervclosing position, for} withdrawing said trip from operative position.

31. A press of the kind described comprising a mold chamber, a plunger forming the bottom wall of said chamber, a lever engaging and actuating said plunger, a closure yoke straddling said chamber and. having its legs pivotally connected to said lever, a closure carried by said yoke and forming the top wall of said chamber, a driven shaft, a disk fixed on said shaft and having a plurality of peripheral notches, an arm journaled on said shaft and having one end con nected to said lever, a pawl pivoted on the other end of said arm and adapted to enin any one of said notches, a sliding trip normally spring-pressed into POSlJ/lOIl to engage the tail of the pawl and withdraw the latter from engagement with said disk,

and a trip-withdrawing link connected to one of the legs of said yoke and having a portion engaging said trip, whereby, when the yoke is moved to chaniber-closing position, the trip is automatically withdrawn from the. path of the pawl.

32. A press of the. kind described comprising a mold chamber, a plunger forming the bottom wall of said chamber, a lever engaging and actuating said plunger, a closure yoke straddling said chamber and having its legs pivotall y connected to said lever, a closure carried by said yoke and forming the top wall of said chamber, a driven shaft, a disk fixed on said shaft and having a plurality of peripheral notches, an arm journaled on said shaft and having one end connected to said lever, a pawl pivoted on the other end of said arm and adapted to engage in any one of said notches, a sliding trip normally spring-pressed into position to engage the tail of the pawl as the latter moves past it to withdraw said pawl from engagement with the disk, a trip-withdrawing link connected to one of the legs of said yoke and having a portion engaging said trip, whereby, when the yoke is movedto chamber-closing position, the trip is automatically withdrawn from the path of the pawl, and an arm fixed on said shaft and adapted to engage a portion of said link to release said trip and permit it to move into the path of said pawl.

38. A press of the kind described co1nprising a mold chamber, a plunger forming the bottom wall of said chamber, a lever engaging and actuating said plunger, a closure yoke straddling said chamber and haring its legs pivotally connected to said lever, a closure carried by said yoke and forming the top wall of said chamber, a driven shaft, a disk fixed on said shaft and having a plu rality of peripheral notches, an arm journaled on said shaft and having one end connected to said lever, a pawl pivoted on the other end of said arm and adapted to engage in any one of said notches, a sliding trip normally springpressed into position to engage the tail of the pawl as the latter moves past it so as to withdraw the pawl i'rom engagement with the disk, a trip-withdrawing link having its rear end pivoted to one of the legs of said yoke and having a portion engaging said trip, whereby, when the yoke is moved to chamber-closing position, the trip is automatically withdrawn from the path of the pawl, and an arm lined on said shaft and adapted to engage said link to lift the same from engagen'ient with said trip after a predetermined movement of the lever.

34;. A press of the kind described comprising a mold chamber adapted to receive the material to be pressed, an actuating lever, a closure yoke straddling said chamber and having its legs pivotally connected to said lover, a closure carried by said yoke and forming the top wall of said chamber, a plunger forming the bottom wall of said chamber and actuated by said lever, a driven shaft, and means for actuating said lever from said shatt, said means imparting a slow movement to said plunger during part of the stroke and a faster movement during other parts of. the stroke.

35. A press of the kind described comprising a mold chamber adapted to receive the material to be pressed, a plunger arranged to exert pressure on the material in said chamber, a driven shaft, and actuating conuections between said shaft and said plunger including a pair of elliptic gears.

M). A press of the kind described comprising a mold chamber adapted to receive the material to be pressed, a movable closure forming one wall of said chamber, a plunger forming another wall of said chamber, a driven shaft, and means actuated by said shaft for moving said closure and plunger toward each other, said means including a pair of elliptic gears. p

37. A press of the kind described comprising a mold chamber adapted to: receive the material to be pressed, an actuating lever, a closure yoke straddling said chamber and having its legs pivotally connected to said lever, a closure carried by said yoke and forming the top wall of said chamber, a plunger forming the bottom wall of said chamber and actuated by said lever, a driven shaft, and actuating connections between said shaft and lever including a pair of elliptic gears.

38. A press of the kind described, comprising a mold chamber, a plunger forming the bottom wall of said chamber, a lever engaging and actuating said plunger, a closure yoke straddling the chamber and having its legs pivotally connected to said lever, a

closure carried by said yoke and forming the top wall of said chamber, a driven shaft, a disk fixed on said shaft and provided with a plurality of peripheral notches, an arm jo-urnaled on said shaft and having one end connected to said lever, a pawl pivoted on the opposite endo'l said arm and adapted to engage in any one of the notches of said disk, a trip movable into position to engage the tail of the pawl and withdraw the latter from engagement with said disk, and means, actuated by movement of said yoke to ehamber-closing position, for withdrawing said trip from operative position.

In testimony whereof, I aflix my signature.

BERNARD M. FINE.

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