US1606717A - Drop hammer - Google Patents

Description

. G. R. MURRAY DROP HAMMER Filed Oct. 24.

Patented Nov. 9, 1926.

GEORGE E. MUnRAnor crmrannnssuns,rnNNsYLvA iA, essIs on ro otter renne- BUEG ENGINEERING COIVIEANY, or orrarasnnsenno, PE11NSYLVANIA,A CORBORAA TIoN or PENNSYLVANIA.

DROP HAMMER.

Application filed October 24, 1921. Serial No. 509,844..

My invention relates to improvements in drop hammers and l ke machines, and more particularly to improvements in the control mechanism of said hammers.

One object of my invention is to provide a control mechanism from which the 6XC6S7 sive shocks commonly found in the usual forms of control mechanism are eliminated, thereby materially reducing the. wear upon and increasing the life of the various elements." 1

Another object of the invention is to provide a control mechanism in which the adjustment of the ram stroke is greatly facilitated.

A still further object is to provide means whereby wear developing in the elements may be readily taken up by adjustment.

The invention further contemplates the provision of means for manually controlling and limiting the stroke of the hammerhetween the automatic stops, thereby permit ting short rapid strokes at the will of the cates the anvil of a board hammer, 2, 2,

the side frames, and 3 the upper housing, 1n which are mounted the feed rolls 4:, 4.,which operate in conjunction with the board 5 to elevate the ram 6, which latter-travels between vertical guides 2 W, on the said frames 2, 2; In the present instance, the feed rolls'are clamped together upon the board, and are separated to release the board in the usual manner by means of the usual eccentric mechanism and a so-called front rod'Twhi'ch'constitutes the operating member for said inChanism. The-"mechanism so far describedi's standard, and will e "well understood by all acquainted with the art V the operating member, extends downwardly from the housing 3 in the usual manner, but

has at the lower end a vlongitudinal'slotfi through which extends a pin 7 in theiend of one. arm of a .bell crank lever 9 pivotally secured at 10 to one of the sid'e'frames 2. The other. arm of the lever 9 is secured by means of a link 11 to the upper end of a control lever 12 pivotally mounted intermediate'itsends upon a pin 13 secured-on the side frame 2. VA springlis in the present instance mounted upon the pin 13, and is confined between a nut .15 on the threaded outerendof the pin and the side of the lever 12, said spring tending to damp-enthe motion of the lever around itsv pivot. p l

Adjustably secured, oneateach end of the control lever 12,- is a wedge-shaped dog, 16 and 17 respectively, said lever being so disposed that normally one or other. of the dogs 16 or 17 extends into the path of the ram 6 as it reciprocates between the guides 2 'In the. present instance, the dogs 16 and "1,7 aresecured to the control lever 12 by means of bolts 18, 18, which latter extend through the saiddogs andthrough suitable longitudinal slots in the control lever, this securlng means providing means for easy and quick adjustment of the dogs longitudinally of the control lever.

Asclearly shown in Fig. 1, the upper and lowerfledges of that side of the ram 6 to which the said dogs are presented are' beveled, as indicated at 19and 20, these beveled edges being adapted to engage the correspondingly inclined faces of the dogs 16 I and 17 respectively;

Pivotally mounted at21, to, the side frame 2 is a lever-22, one endof which underlies and is adapted to engage the lower end of the front rod 7, "the opposite end of the le ver being connected by means of a rod 23 to a lever '24 pivotally secured at 25 tothe said side frame. nectediby means of a rod 26' and a chain or similar flexible connector 27 to-a treadle-QS pivotallymonnted upon a ro,d.29.,mounted nearthebase of the anvil 1, said .treadle having an arm 29' i which is connectedras shown-in FigQ'Q to one of a pair of board clamps- 2.9 whilch retain theboard and ram in i the elevated position" :wheni: it desipe'd use wer -the ewe- Thele'ver Zis also con- '1 means of a spring 22 suspended from the vated position, the treadle 28 constituting the usual clamp control. The lever 24:hfl8 there n an. aperture- 30 which, when the lever is in a depressed position, is adapted to correspond in position with an aperture 81 in the side frame 2, and a pin 32 is provided for insertion in the said apertures whereby the lever may be retained inthe depressed position. The lever 2t-and rod 23 are sup ported in a normal elevated position by 'usual manner by depressing the treadle 28.

When the ram'is' in the elevated position,

the upper portion of the control" lever 12 is shifted outwardly by contact with the side of the ram, as clearly illustrated, the out- Ward movement of the upper portion of said lever having the effect of oscillating the lever 9 so as to elevate the pin 7* and con sequentlythe front rod 7, elevation of the front rod releasing the board from the rolls in the usual manner. With the depression then of the treadle 28,'the ram is permitted to drop, and as it nears the bottom ofits stroke, the beveled'edge 19-comes into en gagement with the inclined surface of the dog 16 which by reason of the outward movement of the upper end of the lever 12 and the consequent inward movementof the lower portion oft-the lever, has beenshifted into the path of the ram. Engagement of the dog '16 by theram has the eifect of'shift ing the lower portion of the lever outwardly and the upper portion inwardly, thereby oscillating the lever 9in such manner as to carry 2 the pin 7 downwardly, thereby releasing the front rod 7, whichlat-ter falls by gravity and causes the feed rolls to grip the board to again efi'ectelevation'of the ram.

' In the upward travel of the ram, the beveled edge 20'engages the inclinedface'of the dog "17', thereby shiftingthe upper portion of the lever '12 outwardly and releasing the rolls in the aforesaid manner to ag'ain permit the ram o fall, the cyclebeing repeated. As previously stated, the'hammer is stop ped with the rani in an elevated-position by releasing the treadle 28, and by means of the lever 22 the rod 23, and the lever 2 1,, it is possible to stop themachine with the rain in the depressed position, this being accomplished by forcing the lever 24, downwardly and inserting theipin 32 through'the aperture '30 and the aperture ,31'to' retain'the said, lever 24 in the; depressed position, "the depression of the lever 24 having the effect,

through the: lever 22, .of elevatinggthe 111201111 6 rod 7 independent of the control level 12,

and thereby preventing the engagement of the board by the feed rolls. The movement of the front rod 7 independent of the con trol lever 12 is provided for in the slot 8 through which the pin extends; from this position of the ram, thepin 32 is To start removed, thereby permitting the front rod 7 to drop by gravity, this movement of the leverhaving the effect of raising the lever 241 through the lever 22 and the rod 23. Due to the flexible connector 27 between the'lever 2a and the treadle, this movement of the lever 24*. does not'aifect'the treadle.

It should be noted that 'the'fiexible counector 27 is sufiiciently long to permit dcpression of the treadle into the clamp-releasing" position without affecting the position of the lever 24, and further, tlns'connector 27 should be of suchlength as to permit depression of the lever 2'by-depression of the treadle beyond the normal extent for releasing the said clamps. "In this manner, when the board and ram are on the upstroke, an additional, pressure of'thetreadle beyond the normal running position will, through the chain 27, rod 26, lever 24, and 1 0C123,

oscillate the lever 22 in such manneras to elevate the front rod, and so shift the rollers to free the board, which with the ram re- 6 turns to the bottom of its stroke. In this manner, the stroke of the ram may be con trolled within the limits of the dogs entirely independent of the normal control elements and without adjustment of any part, this being particularly desirable for sprue drawmg and for series of short blows. V

It will be apparent that the extent of the quence-wear in the front rod and in the roll releasing lever is reduced to a minimum. The automatic action of the control mecha-- nism is extremely smooth, and it will be noted that the downward movement of the front'rod ,7 to permit the rollers to move against the board is controlled by the downward movement of the pin 7 which latter movement is in turn controlled byvthe outward movement of the lower end of the control lever 12, as efiected by the cam-like action between the ram and the inclined sur face of the dog 16, this action eliminating muchof the shock commonly experienced the downward movement of theffront rod, and eliminating practically vall ofthe wear at the lower end oft-11 F Q- QQ P let

tively gentle and progressive movement of the parts is also had at the top of the stroke when the ram engages the inclined surface of the dog 17, the shock at this point also being materially reduced. The reduction in the wear of the parts consequent to this aforedescribed action greatly reduces, and in fact practically eliminates breakage of the parts and the attendant interruptions in the operation of the machine.

It will be noted further that practically all of the wear in the control apparatus occurs on the surfaces of the dogs 16 and 17, and further that this wear is substantially uniform over the entire length of the inclined surfaces of the dogs which are engaged by the ram. A full compensation of the wear occurring in the dogs can be accomplished by merely adjusting the dogs inwardly towards the center of the leverlQ. It will also be noted in this connection that the adjustment of the dogs on the lever 12 is an extremely simple one, being accomplished entirely by manipulation in each case of the two retaining bolts, and that consequently all complication in adjusting the control to give strokes of diflerent lengths is eliminated.

A further extremely important feature of the invention is the provision for controlling the stroke of the ram independent of the normal automatic control, this independent control being accomplished as described by means of the treadle 28. This permits a shortening of the stroke at the will of the operator without reference to the automatic control elements and without the necessity for adjusting these elements to the desired short stroke. here a short light blow is desired or a series of short rapid blows, this feature will be found extremely valuable, as hitherto blows of this sort have required a readjustment of levers and dogs, with a consequent readjustment of these elements to positions giving the normal stroke.

1. In a machine of the type specified, the combination with an actuated element and actuating mechanism therefor, of a substantiallyvertically reciprocatory control element connected with the actuating mechanism, an oscillatory element adapted to receive its motion by engagement with the ac tuated element in its travel, and means interconnecting the control element and the said oscillatory element whereby the oscillatory movement of the latter effects vertical movement of the control element.

2. In a machine of the type specified, the combination with an actuated element and actuating mechanism therefor, of automatic means for alternately connecting and disconnecting the said element from the ee- 3. In a machine of the type specified, the

combination with anactuated element and actuating mechanism therefor, of automatic means for alternately connecting and disconnecting the said element from the actuating mechanism, means independent of said automatic means for disconnecting the said actuated element from the actuating mechanism, an operating element flexibly connected with the independent control, and mechanism for gripping and anchoring the actuated element operatively connected with the said operating element. 7

4. In a machine of the type specified, the combination with. a vertically reciprocatory element and actuating mechanism therefor, of means for operatively connecting and disconnecting the element and the actuating mechanism, gripping and supporting mechanism for said element, and an operating member having connection both with said connecting and disconnecting means and with the element gripping mechanism.

5. In a machine of the type specified, the combination with a vertically reciprocatory element and actuating mechanism therefor, of means for operatively connecting and disconnecting the element and the actuating mechanism, gripping and supporting mechanism for-said element, an operating member, means, including a flexible element con-.

nectin the operating member with the con-' necting and disconnecting means, and means for rigidly connecting the operating member with the element gripping mechanism.

6. In a board drop hammer, the'combination with elevating rolls, of means for actuating the rolls to grip and release the board, board clamping means, and a common control lever connected with both said gripping and clamping means adapted in an elevated position to apply the clamping means, in an intermediate position to release the clamp. and in a depressed position to releasethe gripping rolls.

7. In a machine of the type specified, the combination with an actuated element and actuating mechanism therefor, of control means for the mechanism comprising a substantially vertically movable element, mechanism for elevating the said vertically movable element, and means operatively asso ciated with said mechanism for retaining the element in elevated position,

GEORGE MURRAY.

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