US523802A - Press - Google Patents

Description

'(110 Model.) s sheetssheet 1.

E. C. WILLIAMS.

PRESS.

Ft QR QNo Model.) l 3 Sheets-Sheet 2. E. C. WILLIAMS. PRESS.

No. 523,802. Patented July 31, 1894.l

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E. C. WILLIAMS.

PRESS. No. 523,802.

Patented July 31,1894.

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lUNITED STATES PATENT OFFICE.

EDWARD C. WILLIAMS, OF CHICAGO, ILLINOIS.

PRESS.

SPECIFICATION forming part of Letters Patent N o. 523,802, dated July 31, 1894.

Apple'oll flle December 11l 1898. Serial No. 493,381. (No model.)

To @ZZ whom t may concern.-

Be it known that I, EDWARD C. WILLIAMS, a citizen of' the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Toggle-Presses, of which the following is a specification.

My invention relates to improvements in toggle-presses generally; and my Objectis to provide improved power transmitting mechanism between the driving power of the machine and the toggle mechanism, whereby a force greatly augmented over that of the driving power may be brought to bear against the toggles in extending them.

While my improvements are applicable to many types of toggle-presses, they are especially adapted to presses for making electrotype molds, and in the drawings and description I show and describe my invention in connection with a press of that particular character.

In the drawings-Figure lis a vertical section of a toggle-press provided with my improvements, the section being taken upon line l of Fig. 2, and viewed in the direction of the arrow; Fig. 2, a broken and partly sectional plan view, taken on line 2 of Fig. l; Fig. 3,' an enlarged broken sectional view taken on line 3of Fig. 2, and viewed as indicated; Fig. 4, a section taken on line 4 of Fig.v 3; Fig. 5, a view showing a sleeve detail of the construetion in section; Fig. 6, an enlarged broken sectional plan View showing details of construction of the power transmitting mechananism; Fig. 7, a View corresponding with Fig. 2, but illustrating a modified construction; and Fig. 8, a broken and partly sectional view of the modified construction, the section being taken on line 8 of Fig. 7 in the direction of the arrow.

A A are side frames of the machine tied together by cross bars v5 t near the base and provided at the top with a head or bed A2 secured firmly in place. B is the platen of the press extending below the head A2 and provided with a projecting table B. On the under side of the platenB near its forward and rear edges are shallow circular recesses for round bars s s which at their ends extend into bearings s at opposite ends of the platen and are thereby held firmly in place. The

platen rests upon two pairs of toggle-jointed leaves C C. The upper leaves r r are recessed longitudinally at their upper ends, to [it the round bars s, and at their lower ends to fit over round bars r. The .lower leaves r2 at their lower ends, are provided with round openings to receive round bars r3. The bars r3 rest at their ends in coincident openings provided in the side frames A A. At their upper ends the leaves r2 are recessed longitudinally to t under and support the bars r.

D is the operating bar for the toggles having at 'its rear end a loop q, surrounding the rear bar r', and toward its forward end a loop Q surrounding the forward bar r. The bar D extends and engages the bars r about midway of the lengthl of the latter.

A3 A4 are forward and horizontally extending arms preferably cast integral with the side frames A A', respectively, and forming parts of the main frame of the machine. Secured to and extending between the outer end portions of the arms As A4 is a block or casting A5. The block A5 is formed at its center with upper and lower backward projecting plates p p', respectively, which at their outer edges are flanged to afford guides p2, as shown in Fig. l. In the chamber formed by the plates pp are two vertically disposed anti-friction rollers p3 on pins or shaftsp4 which extend through the platespp.

E is asliding wedge having a working surface m, and formed with a loop E affording a working surface m parallel with the surface m. At the forward edge or base of the wedge are upward and downward extending flanges or shoulders n which fit behind the guide flanges p2 of the block A5, and operate to guide the wedge, whereby it moves at its forward face or base against the bearing rollers p3.

The operating barD at its forward end portion beyond the toggle C is bifurcated, to embrace loosely the rear side of the wedge E, and it carries a vertical anti-friction roller D which extends through the loop E and is yof a diameter but slightly less than the width of the loop. Formed upon the block A5 are backward projecting stops p5 above and below the path of the wedge E against which the bar D bears at one side of its bifnrcated end. As the wedge E is slid in its guides in IOO the direction of the arm A4 it bears at the surface 'm against the roller D and forces the bar l) longitudinally in the backward direotion to extend the toggle-jointed le'aves r r2 and raise the platen B in the direction of the head A2. During this operation the bar D at its forward bifurcated end slides against the stops p5 which operate as braces for the bar to prevent its becoming bent or broken by the lateral pressure exerted by the wedge. In the movement of the wedge in the direction of the arm A3 the surface m in the loop E bears against the roller D', operating thus to draw the bar D longitudinally forward to flex the toggle-jointed leaves and lower the platen B.

The preferred mechanism for sliding the wedge in its guide, to bring about the opera ation described, is shown in Figs. l te G inelusive.

Secured upon the arm A3 is a laterallyprojecting stirrup frame F comprising parallel side-bars Z and an end bar Z. Extending through a smoothly bored opening Z2 in the end-bar Z', and a similar coincident opening Z3 in the arm A3, is a threaded rod or screw G. The openings Z2 and Z3 are just large enough to permit the screw to slide readily in the lolngitudinal direction therein without lateral p ay.

Surrounding the screw in the frame F is a sleeve G', which extends at opposite ends respectively against the arm A3 and end-bar Z. For convenience of manufacture, I prefer to provide the sleeve in two sections 7a and Zt', each provided with an lenlarged part 7a2 affording a shoulder 7c3 anda groove, affording a key-way 7a4, the section Zt alone being internally threaded to fit and engage the screw G. On the outer end of the screw G I provide a crank wheel G2, and near its opposite end the screw is provided with a circumferential recess to afford aneclt portion t' and beyond the latter a head-portion i'. rl`he screw is swiveled at its head t" in a socket in the end of the wedge E, being held thereto by adivided plate t2 which surrounds the neck i and is fastened to the wedge by screws, as shown. Crossing the socket in the wedge, in which the screw G is swiveled, is an opening, and through the head il is an opening which, when the screw is turned to one position on its axis, registers with the opening .fr whereby a pin 'y may be passed through the wedge and screw to hold them in rigid relation when desired, as hereinafter described.

Journaled upon the section 7o of the sleeve G is a pulley H, confined at its hub-portion between the respective shoulder 7c3 and endbar Z; and journaled upon the section lo of the sleeve is a pulley Il', confined at its hub between the respective shoulder 7e3 and arm A3. The pulleys may be belted to a power shaft, not shown, one of the belts being open and the other crossed, whereby the pulleys will rotate in opposite directions. On the inner or adjacent sides of the pulleys are season flanges affording annular flaring frictionclutch members Il?. Surrounding the enlarged part 7a2 of the sleeve G is a wheel I, provided with a key-way to register with the key-way 7e", a suitable key or feather tstherein operating to maintain the wheel and sleeve sections against independent rotation while permitting the wheel to slide longitudinally off the sleeve. The wheel I is provided with a peripheral groove 7L, and with lateral flanges, affording tapering friction-clutch members 7L adapted to enter and engage respectively the aring clutch-members H2. Fasteued at opposite ends rigidly to the sideebars Zend extending below the wheel I is a stirrup bar L, to the center of which is pivoted ayoke L surrounding the wheel I. The yoke L' carries pivotal blocks L2 which extend into the peripheral groove Zt, of the wheel I, at opposite sides of the latter. At its upper end the yoke L is pivotally connected to one end of a rod L3, which extends in the horizontal direction across the front portion of the machine above the wedge E, and is pivotally connected at its opposite end to a lever or handle L4 pivoted upon the arm A4. Between its ends the rod L3 is threaded to receive longitudinally adjustable stop-nuts g g.

Rising from the wedge E is an arm Igprovided in its upper end with a loop or opening through which the rod L3 loosely extends between the stops g g. In the yoke L is an opening 5c', and in the wheel I is an opening which when the wheel is in one position registers withthe opening a" to receive a p in y] which when inserted holds the wheel against rotation. When it is desired to operate the machine by hand-powerapplied to the crank wheel G2, the pin fy is withdrawn from the opening fr, to permit the screw G, which thus constitutes the initial driving mechanism of the machine, to turn in the wedge E, and inserted into the opening to', to lock the wheel I, and, through the latter, the sleeve G against rotating. Turning of the crank wheel in one direction will cause the screw to travel through the sleeve and advance the wedge to produce extension of the toggles; while turning of the cranlewheel in the opposite direction will retract the screw and wedge and produce flexion of the toggles.

To operate the machine by power applied to the pulleys II II, which then constitute the initial driving mechanism, the piu r/ is withdrawn from the opening ar', whereby the wheel I and sleeve G are free to rotate; and the pin is inserted into the opening a', to lock the screw G against rotation; and the stops g g are adjusted to properly limit the dis tance of travel of the wedge, as hereinafter explained.

To cause the wedge to advance and extend the toggles the lever L't is swung to causo the clutclrshipping mechanism L8 L to shift the wheel I, from the intermediate or release position sho-wn, into engagement with the clutclrinember Ilr2 ot the pulley I. This cn- IDO IOS

gagement causes the wheel I, and through it the sleeve Gr', to rotate with the pulley H and advance the screw G and wedge until the arm E2 strikes the stop g', and thereby moves the clutch shipping mechanism and the wheel I to its intermediate position. The Wedge stops the instant that the clutch members I H2 are disengaged, the stop g being adjusted to thus limit the distance of travel of the wedge and the rise of the platen. To retract the wedge, and lower the platen, the lever L4 is moved to shift the wheel I to the pulley H', whereby the said wheel and sleeve G will ro` tate with the pulley H and retract the screw Gand wedge until the arm E2 strikes the stop g and thus releases the clutch members. The machine may be started or stopped at any time by movement of the lever L4,-so that the compression exerted by the platen may always be under the perfect control of the operator.

The power transmitting mechanism, constructed as described, operates smoothly and without material friction to cause a force multiplied many times over that exerted by the driving power to be exerted against the platen, thus giving to the machine capacity for exerting enormous compression, whereby it may perform its function of making electrotype molds with apparent ease and turn out molds possessing a high degree of perfection.

In the modified construction the mainframe, toggle-mechanism, wedge .E and the guiding and sustaining block A5 may all be constructed as described. In place of the screw G, I provide a rack-bar M, fastened at its inner end to the wedge and movable longitudinally through a suitable opening in the arm A3 (not shown). On the side A of the machine is a stirrup frame Nin which is journaled a shaft f provided at one end, beyond said frame, with a pinionf. Loosely mounted upon the shaftf inthe stirrup frame are pulleys e e', corresponding with the pulleys H H described, and affording friction-clutch members. Feathered upon the shaft f between the pulleys is a peripherally grooved sliding clutch member e2, corresponding in construetion and operation with the wheel I described, which is operated to engage and release the pulleys e e by a pivotalshipping lever e3. Secured upon the arm A3 is an arm P, having a projecting finger P. The arm l? affords a bearing for a short shaft d carrying at one end a gear wheel d,meshing with the pinion f', and carrying at its opposite end a pinion d2, which meshes with the teeth of the rackba-r M. At the pinion cl2 the rack-bar slides in a recess in the under side of the finger P which thus operates to steady the rack-bar and hold it to the pinion cl2. The pulleys are belted to a drive-shaft and rotated in opposite directionsb The clutch-member eimay be shifted by its lever from the intermediate or release position shown to engage either pulley, and cause the shaft f and its pinion f to rotate, and turn the gear wheel d and pinion d2. Depending upon the direction of turning of the pinion the rack-bar isvmoved to advance or retract the wedge E to extend or flex the toggles. The power transmitted from the pulleys e e to the toggles is greatly augmented by the speed reducing gearsj d cl2 and the sliding Wedge, and the platen may be caused to exert enormous pressure under comparatively slight power applied to the pulleys.

In the drawing of the modified construction no automatic clutch shifting means are shown, but mechanism for the purpose, substantially like that of the preferred construction, may be readily provided, if the function of the toggle-press makes such mechanism desirable.

What I claim as new, and desire to secure by Letters Patent, is-

l. In a toggle-press,the combination with the frame, the initial driving-mechanism to which the power is applied,and the toggle, of a reciprocal toggle-extending and flexing-bar pivotally connected with the toggle, a sliding wedge mounted against a bearing on the frame and engaging said bar, and power transmitting screw mechanism between the said driving-mechanism and wedge, operating to slide the wedge in its guide against the said bar, to move the bar and extend the toggle, substantially as described.

2. In a toggle-press, the combination with the initial driving-mechanism to which the power is applied, and the toggle, of a reciprocal toggle-extending and flexing bar pivotally connected with the toggle, a sliding wedge mounted in a guide, and having a wedge surface to bear against and advance the bar, to extend the toggle, when the wedge is moved in oneA direction, and a wedge surface to engage and retract the bar and iiex the toggle when the Wedge is moved in the opposite direction, and power-transmitting mechanism between said driving mechanism and wedge operating to slide the wedge in its guide, substantially as described.

3. In a toggle-press, the combination with the initial driving-mechanism to which the power is applied, and the toggle, of a reciprocal toggle-extending and fieXing bar D pivotally connected with the toggle and having a bifurcated end, a sliding Wedge E mounted in a guide, and provided with a loop E affording with the wedge parallel working surfaces m m,"a roller mounted in the bifurcated end of the bar D and extending through the loop E', and power-transmitting mechanism between the said driving mechanism and wedge, operating to slide the wedge in its guide to move the said bar and extend and flex the toggle, substantially as described.

4E. In a toggle-press, the combination with the frame of the machine, of a longitudinally movable toggle-operating bar, a sliding wedge at the end of said bar having shoulders n, a block, on the frame, in which the wedge is mounted to slide, provided with guides to engage the shoulders n and a roller bearing for ICO 4 ecaeoe the Wedge, and power mechanism for moving the Wedge, substantially as and for the purpose set forth.

5. In a toggle-press, the combination with the frame and initial driving-mechanism to which the power is applied, of a reciprocal toggle-extending and flexing bar pivotally connected with the toggle, a sliding Wedge mounted against a bearingf on the frame and engaging said bar, areciprocal screw mounted in a guide and connected with the Wedge, and power-transmitting mechanism between' said driving mechanism and screw for turning the screw to advance and retract it in its guide to slide the Wedge and move the said bar to flex and extend the toggle, substantially as described.

6. In a toggle-press, the combination with the initial driving-mechanism to Which the power is applied, and the toggle, of a reciprocal toggle-extending and fiexing bar pivotally connected with the toggle, a sliding Wedge mounted in a guide to bear against the end of said bar, a reciprocal screw connected with the Wedge, a threaded sleeve upon the screw and means connected With theinitial drivingmechanism, for rotating the sleeve to ad Vance and retract the screw and Wedge,to move the said bar and flex and extend the toggle, com* prising contrarily rotating pulley clutchmemhers, a Wheel affording an intermediate clutch-member and engaging the sleeve, and shipping-mechanism for moving the wheel into and out ot engagement with the pulley clutch-members, respectively, substantially as and for the purpose set forth.

7. In a toggle-press, the combination with the toggle, of a reciprocal toggleextending and flexing bar, pivotally connected with the toggle, a sliding Wedge mounted in a guide and engaging said bar,initial power-mechanism, comprising contrai-ily rotating pulleys provided with clutch-members, an interinoo diate clutch member, means for sliding the Wedge in its guide to move the bar and extend the toggle, geared to said intermediate sliding clutch member7 shipping-medianism for the sliding clutch member actuated by the movement of the Wedge to the limit ol its traverse in either direction to move the sliding clutch member to an intermediate position ont of engagement with the pulley clutchmembers, and an operating handle for the shipping1neclianism, snbstantiall7 as and for the purpose set forth.

EDXVARD C. VILTAMS.

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