US1975537A - Forging machine - Google Patents

Description

Oct. 2, 1934. w. w. CRILEY 1,975,537

FORGING MACHINE Filed March 15, 1932 2 Sheets-Sheet l Jil/iam M65-Zay A TTORNEYS Oct. 2, 1934. W w CRlLEY l 1,975,537

FORGING MACHINE Filed March 15, 1932 2 Sheets-Sheet 2 ATTORNEYS.

refereed oei. 2, i934 1,975,537

UNITED STTES PATENT FFICE FORGING MACHINE William W. Criley, Cleveland, Ohio Application March 15, 1932, Serial No. 598,963

5 Claims. (Cl. 'Z4-585) The purpose of this invention is to provide a omitting the spring and spring mounting; Fig. 5 safety release for forging machines. This type is a diagrammatic plan View of the position of of release is, in general, well known and comparts in the intermediate collapsing position of prises a linkage system in a thrust :member of a Fig. 2; Fig. 6 corresponds to Fig. 5 but shows the 5 forging machine by which the links are normally final, fully collapsed position; and Fig. rl is a 60 maintained in position to deliver a straight thrustI vertical section indicated by the line 7--7 of Fig. but in which in case the thrust load is exceeded 4; and Fig. 8 is a vertical section indicated by the linkage system will move so that the unthe line 8-8 of Fig. 1. delivered thrust movement will be absorbed in In the preferred form here shown and del repositioning the linkage members instead of scribed, the safety release is illustrated as ap- 05 breaking the machine. The mechanism used in plied to the die actuating slide 1 of a forging this invention, in common with others which are maCllDe 2 Uf the 'type Where in the header Slide directed to this type of safety arrangement, in- 3 movable longitudinally of the machine, and the cludes a strong spring which normally holds the di@ Slide 4, transversely movable, are both actul members of the linkage in extended position and ated from @0111111011 transl/EIS@ Shaft 30,- Fg. 1. 70 upc. which the Stress ai, normal loads is less In the form here illustrated the slide 1 is moved than the strength of the spring. to die-closing position by a cam 32 Working In earlier types of this sort of release mechaagainst a IOllel' 31, in a rearward extension 1A nism the arrangement has usually been wastef lille Slide, and lS retracted by 911011161" Cam 33 20 ful 0f Space and diilgult t0 asgeynble, and, fur.. Which bfal'S against the back Of the Slide, 110i] 75 ghermore, has. necessitated a Complete resetting shown. The shaft 30 also drives vthe header slide of the spring pressure after every time that the 3 by'aCIDk 34 This Construction being Well unsaiety arrangement has been disconnected to set ClelSOO in the all", Only the Dart 0f the machine the dies to which this invention is directly applied is illus- In the present invention I hws@ mis Spring trated in detail. The die slide 4 is driven from 80 and its connections entirely in the actuating slide le di@ actuating Slide 1 by a toggle Composed of or cross head, and, furthermore, so arrange the a bed plate knuckle 5 and die Slide knuckle 6. plvparts that the spring pressur may be released, oted respectively to the machine frame at 'I andto for setting dies, and afterwards made effective the die Slide at 3 and joined by a DVOG 9 t0 Which 3Q again without loss of the original adjustment. a @Onnectlng link l0 fl'Om Jib@ actuating Slide 1 85 Also, after the spring has been removed it may is also pivoted, this link being pivoted at its be replaced af, its former adjustment. wihout other end at 11 to the safety release mechanism. needing any adjustment-, The safety mechanism includes a three-part To the accomplishment of the foregoing and linkage 12, 13, 14, a Spring 15 dhd21 Spring mOuntrelated ends, said invention, then, consists of the ing 16. 17, 13, all Carried by the atllalng Sli-de 90 means hereinafter fully described and particular- 1- Unde normal @Ondf/OH these parl/S d0 not ly pointed out in the claims. move with relation to one another or to the actu- The annexed drawings and the following deating slide during the movement of the actuating Scription Set fgrth. in detail Certain mechanism, Slide, but llnflel OVeIlOad Conditions the OlWaId o embodying the invention, such disclosed means movement of the slide 1, instead of moving the 95 constituting, however, but one of various melink and thus spreading the toggle 5, 6, ccmchanical forms in which the principle of the inpresses the spring and re-arranges the linkage vention may be used. against the opposition of the spring. The link- In the accompanying drawings Fig. 1 is a parage is mounted upon the slide 1 by pivots 19 and tial plan view of a machine to which this inven- 20, as shown in Fig. 8 and as indicated by shading 10G tion is applied, the safety release being shown in Figs. 4, 5 and 6, fixed to the slide, and the link in normal position, that is, not released; Fig. 2 elements are mutually connected by movable is a view similar to Fig. 1 showing the safety pivots 11, 21 and 22. The linkage and the spring release acting under an overload when further are interengaged by a trunnion block 23, the trunmovement of the die is stopped, the parts being nions of which turn in one arm 24 of a bell 19E in extreme position but not final released posicrank lever on the pivot 20. In detail, the link tion; Fig. 3 is an enlarged side elevation of the element 12, known as the relief knuckle, is apsafety spring rod and associated parts, the spring proximately triangular in. plan view,v having at itself being omitted from this gure; Fig. 4 is a each apex a bearing to receive, respectively, the plan view of the links, corresponding to Fig. 1, but pins of pivots 19, 11 and 21. The pivot 2i is con- 110 nected to the link 13, the other end of which is connected by the pivot 22 to the longer arm 14 of the bell crank lever, 14, 24, pivoted at 20 and having a shorter arm 24 with bearings atits outer end on journals 25 on the trunnion block 23. 'Ihe arm 14 is known as the relief lever and the arm 24 as the relief lever arm. The latter is bifurcated, being conveniently constructed with a detachable top 24', as shown in Fig. 7. Thus by unfastening and lifting ofi the the top plate 24' the trunnion block may be disconnected from the arm 24 by simply lifting out the rod 16 and the block 23 with it.

The relief spring 15, a compression coilspring, surrounds the rod 16 which is threaded at each end and which carries at one end a threaded washer 17 and at the other a nut and lock nut, 18 and 18. These nuts are clear of the trunnion block 23 except when the pressure of the spring 15 is to be taken ofi" the linkage. The trunnion block 23 is sleeved freely on the rod 16. The spring 15 bears at its opposite ends against an enlarged head 23 of the trunnion block and against the washer 17, respectively. Thus the linkage cannot collapse into the positions of Figs. 5 and 6 until the relief lever arm 24 has moved counterclockwise, compressing the spring 15. The short end of the rod 16 which extends to the left of the washer 17 is seated in the front wall of the actuating slide 1 as indicated at 26, Fig. 3. It will be noticed from Figs. 1 and 2 that the linkage is below the plane of the top edge of the cam slide. Provision is made in the sides and ends ci' the cam slides to allow these parts to assume the positions shown.

A preferred form of mechanism to limit the clockwise movement of the pivot 22 about the pivot 20, and thus to keep it slightly below dead center so that the joint at 22 will break outward, toward the header slide, instead of toward the spring, comprises a stop 27 formed on one edge of a shelf 28 in the upper part of the slide l. The upper end of the pivot pin 22 is correspondingly flattened as shown in Figs. 1 and 2 to engage against. this stop. Thus the movement of the trunnion block 23 to the right, Figs. 1 and 3, is limited by the stop 27 and not by the nut 18.

A description of the operation of the device follows. Under normal conditions the spring 15 and the linkage 12, 13, 14 maintain the positions shown in Figs. l and 4 in every position of the travel of the actuating slide 1. Under overload continued forward movement of the slide l swings the relief knuckle 12 counterclockwise about the pivot 19, breaks the toggle 13, 14 away from the stop 27, swings the bell crank 14, 24 counterclockwise, and moves the trunnions 25 to the left, compressing the spring 15. This is the intermediate position, shown in Fig. 5, passed through on the way to the full collapse position of Fig. 6.

When the relief knuckle 12 has swung to the position of Fig. 5 the pivots 19, 21, 22 are aligned with 21 a triiie to the right of the line 19-22, so that a tcggle exists here which will break to the right under the pressure of the spring 15, either with or Without further resistance of the link l0. The longitudinal component of movement of the pivot l1 from the position of Fig. 4 to that of Fig. 6 is equal to the entire forward travel of the actuating slide 1, so that even if an obstruction to the die movement is encountered when the movable die is in full open position, no damage will be done.

To re-set the safety mechanism from the position of Fig. 6 to that of Fig, 4, the slide 1 is run rearward, to the right in the figures. The inertia of the movable die holding the link 10 and pivot 11 swings the knuckle 12 clockwise. about the pivot 19 just enough to break the toggle joint at 21 over dead center and slightly to the left of the 8i) position of Fig. 5, whereupon theexpansion of the spring 15 snaps the linkage back to the position of Fig. 4. To throw out the safety device for setting dies the spring pressure is taken ont' the linkage by setting up on the nut 18 until the 85 spring thrust is taken on the linkage and held entirely by the nut. Then by moving the pivot 22 by hand away from the stop 27 the safety can be thrown out so that the travel of the actuating slide can be taken up in the linkage while the 9@ movable die remains full open on the forward stroke of the header slide, as is necessary at times in the operations of setting dies and centering tools. This does not alter the spring adjustment, which is governed solely by the position of g5 the washer 17. Thus again slacking off the nut 18 to the position o1 Fig. 3 leaves the safety all ready to work again without readjustment.

To change the spring adjustment the nut 18 is run up to lock with the nut 18 and the two 100 are then used to take a wrench for turning the rod 16. The set screw of the washer 17 having been released and this washer having been held against rotation, rotation of the rod 16 moves the washer in the proper direction. When the correct m5 setting is had the set screw is locked down and the nuts 18, 18 slacked oii.

1n dismounting the safety spring and its connections, the nut 18 is tightened up to move the trunnion block in and so take the pressure of the 'H0 spring off the linkage, the relief lever arm top 24' is removed from the relief lever arm 24 and the bottom trunnion 25 is lifted out of its bearing. The socket 26 holds the end of the rod 16 with side clearance, allowing the needed freedom of M5 movement for these operations. The rod 16, with the spring 15 thereon, is taken out and the spring pressure gradually released by backing oli the nut 18 until the spring is free, after which the nut can be taken 01T the rod, the trunnion 23 12 taken on, and the spring removed.

Other modes of applying the principles of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularly' point out and distinctly claim as my invention:

l. A safety device for a machanism of the type described comprising a plurality of interconnected toggles on a common movable powertransmitting'support, said toggles being adapted to transmit thrust, and resilient means for maintaining said toggles extended, said toggle system and said resilient means being enclosed in common limits, a mounting for said resilient means comprising a carrying element and a connector to said toggle system, said carrying element being carried at one end by said connector and at the other by said common support, said connector being movable relatively to said support by force applied to said toggle system and also by the force of said resilient means, and means for conning the force of said resilient means to stress 14:5 upon the carrying' element.

2. A reciprocating safety mechanism for transmitting thrust, comprising in combination a slide, driving and driven connections thereto, a toggle system within said slide, and means for prevent- 15@ ing collapse of said system underpredetermined loads, said means including a spring, a carrier whereon said spring is mounted, a connecting member between said spring and said toggle system freely slidable on said carrier, another element on said carrier movable longitudinally thereof and engageable with said connecting member, and longitudinally successive positive contact means between said last-named element and said carrier.

3. In a safety mechanism of the type comprising a thrust-transmitting slide, two interconnected toggles pivoted thereto and a spring adapted to hold said toggles immovable against ordinary working loads, spring mounting means comprising a rod disposed longitudinally through said spring, a threaded Washer on one end of said rod constituting an abutment for said spring, a slidable trunnion block on the other end o said arm and pivoted to a toggle link, a nut threaded on the other end of said rod and movable into engagement with said block to take the pressure of said spring off said toggle link, and removable connecting means between said link and said trunnion block.

e. In a forging machine having a die actuating slide, a safety release comprising a linkage and a spring all mounted on said slide and contained therewithin, a rod, said spring being mounted upon said rod and said rod being mounted at one end in said slide, an end seat for said spring on said rod and adjacent one end thereof, and a block slidable on the other end, said spring tending to move said block in a direction away from said end seat, said linkage including an arm pivoted to said block, and a stop on said slide adapted to coact with said linkage to limit the movement impressed on the linkage by said spring.

5. A safety device for a mechanism of the type described comprising a thrust-transmitting slide including a housing portion, a front and a rear pivot thereon, two interconnected toggles, one member of each toggle being carried by one of said pivots,4 said toggles being adapted to transmit thrust, and resilient means for maintaining said toggles extended, said resilient means being disposed immediately adjacent the toggle system and housed entirely within the housing of said system, an abutment on said housing in advance of said front pivot, and a trunnion pivoted to an arm of said toggle system, the pressurerof said resilient means being taken at one end on said abutment and at the other end on said trunnion, said resilient means being compressible when the thrust transmitted by said slide meets With extraordinary resistance.

WILLIAM W. CRILEY.

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