US1030381A - Safety attachment for drop-hammers, &c. - Google Patents

Description

, B. BREARLEY. SAFETY ATTACHMENT FOR DROP HAMMERS, m.

APPLICATION FILED JAN.27, 1912.

1,030,381, v Patented June 25, 19 12.

WiTNESSES INVENTOR.

aw; 9M2:

Ben Frearlay,

safety-stop, as it may be termed, adapted, in case of abnormal action of the hammer, as for example, upon a breakage of the ham{ 'tially'with Figs. 1

BEN B'REARLEY, OF PROVIDENCE, RHODE ISLAND SAFETY ATTACHMENT FOR DROP-HAMMERS,-&c.

Specification of Letters Patent.

Application filed January 27, 1912. Serial No. 673,856.

To all whom it may concern:

Be it known that I, BEN BREARLEY, a subject of the King of Great Britain, residing at Providence, .in the county of Providence and State of Rhode Island, have invented -certain new and useful Improvements in Safety Attachments for Drop-Hammers, &c., of which the following is a specification.

This invention relates to a safety device adapted to be attached to drop-presses,' or drop-hammers, as they aresometimes called, and it consists substantially in the novel construction, arrangement and combination of parts, all as hereinafter set forth and claimed.

In drop-forging machines, or other analogous machines of this general type, the ver tically movable hammer .or amping member is liable to accidentally or prematurely drop; sometimes this happens before the dies are fully positioned or adjusted, resulting in injury to the workman, and in some cases causing injury to the dies or even to the stock itself.

The objectI have in View is to render drops or presses equipped. with my 1nvention practically incapable causing accidental in ury. In other words, I provlde the machine with a simple, semi-automatic mers liftingstrap or belt while it is being elevated, or even when the hammer is pre maturely dropped, whereby the self-positioned interposed stop is adapted to arrest the hammer in its downward movement.

- In the accompanying'sheet of drawings, Figure 1 represents, in frontelevation, portions of a drop-hammer machine equipped with my improved safety-stop, the hammer beingin normal working'action; the stop at the same'time being in the locked rearward position; Flg. 2 1s a corresponding top plan view, in 'enlarged'scale, the dotted lines in-' dicate the extreme inward position the stop would automatically assume when it is released, and thehammer omitted or positioned above it; Fig. 3 is a frontelevation, in partialsection, corresponding subst'an and 2; Fig. 4 is a partial side elevation, viewed from the left of Fig.

' 3. The stop device, however, in this figure is represented in the normally released position, corresponding with'the dotted line po bers of sition of the stop indicated in Fig. 2; Fig. 5 1s a side elevation showing portions of the machine, viewed from the back;'and Fig". 6 is apartial sectional view of'the locking and tripping device, ing with that shown in Fig. 2.

I may state that the safety attachment forming the subject of this application for patent is more particularly devised for use Patented June 25, 1912.

its position correspond lnconnection with metal swaging or forging machines in which the hammer is capable ofbeing released from its elevated position'by the operator-or even automatically swhereby the force or impact of the hammer-blow upon striking the suitably positioned stock, in cooperation with the die or surface on which it is supported. causes the stock to be correspondingly transformed, in a well-known manner.

Referring to the drawings, a, b, and i1 lnd cate, respectively, the bed or anvil, the uprights or guides, and the hammer mema drop of usual construction. llhe ad acent faces of the anvil and hammer may be adapted to receive die {holders d. The drawing also represents the verticallv movable hammer member slidably mounted between the ways of thefuprights and con-- nectcd to a strap which the hammer Means for lifting andreleasing the hammer are not shown, since mechanism for this or fiat belt 6, through purpose are well-known and therefore not.

deemed essential to this specification.

The following 1s a more detailed ortiscripe tlOIl of the stop device and the marner is adapted to be elevated.

of its operation :-The stop proper A, of

suitable dimensions, is arranged to auto-' matically swing onto the face of the dieholder d or. other surface disposed-below and in alinement with the hammer. The ends of the stop are counterbored or otherwise adapted to receive plugs oof rawhide or other-substance possessinga degree of resiliency. Integral with the stop are arranged arms ff, terminating in a vertical hub 2' mounted to vibrate on a headed posts tapped into a stud 7c, in turn secured to the anvil a--see Figs. dand 5. A set-screw ng? engaging the lower or screw-threaded por: tion of the post, connection with a spring 8 interposed between the ad acent faces of said hub and stud, serve to maintain these;

parts in yielding vertical adjustment... The

upper end of the stops hub i has a short lateral arm 7 arranged substantially oppo- ,'the stop is actuated.

site'the arms f, having. a vertical pin 1n fixedto its outerend, through which-latter A manually operable'jpul l-rod m, liaving a reduced portion m extends transversely through one oflthe uprights b. To the rear end of the roldiis secured a flanged,- ear m jointed tothe said' vertical pin W. A spring 8, mounted on the part m} of the rod m an consisting of a light spring .3 acts to mainsitioned between the "upright and said ear, 1s adapted'to' automatically swing the stop to the extremeinward position'when the latch-member 5c, pivoted. at 0 to-the front of the upright, is temporarily disengaged from the portion m of'the roF n; means V tain the latch in yielding contact with the the hammer thereon,

pull-rod, as clearly shown. It may be stated that the stop, when in the released position, is adapted to temporarily support cated in Fig. 4:. Now, assuming that the several parts of the drop-forging machine or press and the safety-stop attachment have been properly adjusted and adapted for normal operation, whereby the hammer h, upon being released 7 by the operator, will, in its descent to transform the stock positioned therebelow, engage the inner arm v of the tiltable, springpressed latch a (previously actuated by the operator to-swing and lock the stop A in the rearward position), and trip or release the latch Jfrom the endwise movable springpressed pull-rod,.thereby at the same time permitting the spring 8 to move the stop inwardly ,to yieldingly. bear against the back he hammer) arrives. at a state of rest. Fig. 2 represents ofthe hammer before it the normallylocked-stop before it has been thus released by the downwardly moving.

. hammer. After the blow has. been delivered the hammer, itself is moved upward .and supported at any desired height in a well {known way. During said upward movement the spring scauses the-stop to.

swing inwardly and freely to its limit, thereby for the time being positioning it below and [in alinementwith the hammer, the stop anvil or die-holder.

then practically resting upon the face of the ber Aautomatically swings under the hammer just after the latters base passes above the upper end of the stop. The-dotted lines in; Flg. 2, also Fig. 4, indicate the corresp/ondrng position.- The attendant next, af-

' ter performing the necessary oper ons 1n- .cident to the normal action of the machine,

" part m substantially as indi-- Obviously, the mem-.

until released-see Figs. 3 and 6. It may be added that said movement oftlie latch places the other arm'c in normal position again. The several elements now being in V the normal positions, the operator next releases .the supported elevated hammer, which,.in falling to make the stampingblow, engages the latch and automatically trips it, thereby, too,releasing the stop and permitting it to engage the back of the hang mer, as before-described. In case, however? the operator fails tomove and lock the stop in the retracted position before he releases the upwardly supported hammer, the latter will, when released, fall on the stops end instead of completing its normal stroke and blow. in the usual practice of setting 'or adjusting the dies in drop machines of this class, preparatory tonormal working, the.

operator places a shortwooden block on the anvil for the hammer to rest upon during the die-adjustment process. The block is removed and replaced duringeach of the tentative strikes of the hammer; the workman, insuch die-setting tests, simply elevates the hammer a distanceslightly exceeding the height of the block. If he fails to thus replace the block before the next succeeding-blow, his hand or'fingers are liable to be accidentally caught and severely injured. My improved safety-stop is welladapted to be thus employed in lieu of the wooden blocks. In such case the stop auto- I matically swings under the hammer after each tentative strike or reduced blow,tl1ereby avoiding the liability of accident to the operator, assuming, of course, that he moves and locks the stop A 'n the retracted posh tion prior tov releasing-the hammer to make 'said reduced blow. The hammer,

trips the stop so that it=will automativ in fallcallyswing inwardly 1n position to support it after the next upward stroke of the hammer is made. p y

I claim as my invention and desire to secure by S. Letters Patent 1. In a safety-stop device for drop hammers oranalogous machine, a movable stop member disposed with relation to the hammer, means for holding the stop in the normally retracted position, means, capable of being actuated by the hammer in its descent, for tripping or releasing the stop, and means provided for automaticallymoving the released stop inward between the anvil and hammer].

2. Inta drop-hammer or analogous machine, the combination with the anvil and a guided,gvertically movable hammer disposed above the top face of the anvil,'of a safetystop device having a springi pressed member, constitutin the stop pr 'oper, means for normally lockmg 1t in position with relation to the hammer, and tripping means adapted to be engaged by laterally movable,

the hammer for releasing the saidstoi),

Whereby fitgis adapted to m'gve under the hammer, automatically when the letter is misedeg'distance exceeding the height of vide fixed to said machine, 10

v the stop;

C opies ef this patent may be gbtained for eapa-ble of being-tripped by the'hammer forfive cents eatiz, by addressing Washington, D. 0,.

releasing the stop from said retracted position, whereby it is adapted to 'automaticaIly move inward under the hammer while the latter-is being elevated, and manually con-, trolled means for returning and locking the stop in the seid'normal retracted position.

In testimony whereof I have affix'ed' my 20 signature in presence of two Witnesses.

BEN BREARLE Y.

, wYvitnesses I GEO.-H. REMINGTON,

, 'JQHN JAMES COUPE.

the commissionel of Patents,

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