US1674844A - Punch - Google Patents

Description

June 26, 1928.

. 1,674,844 H. c. SPENGLER PUNCH Filed May 5, 1926 W W D Patented June 26, 1928.

HAROLD Ci SPENGLER, QF BOCKFOBD, ILLINOIS.

PUNCH.

Application filed May 5, 1926.

This invention relates to metal working punches of the hand lever type.

Que of the principal ob 'eots of the invention is to provide a punch incorporating a novel form of means to impart movement to the punching element, the said means avoiding the projection of any part or parts in a plane in front of the jaws of the punch to enable gettingin closer to adjacent walls in the punching operation as, for example, in skylight work.

Another object is to provide means for operating the punch element affording a longer stroke to permit operating on work where, by reason of several thicknesses being laid together without being compressed into a compact and solid thickness, the work assumes a false bulky thickness necessitating a longer stroke of the punch and, of course, a greater span of the jaws to accommodate the work, this feature of the punch being also of particular advantage in the punching of. holes in the metal frame work of skylights. I

A still further and important object of the invention is to provide a simplified punch dispensing with the usual rack and gear operating connections and the like and, at the same time, enabling easier removal of the punching element by reason of the novel construction employed.

The invention is illustrated panying drawings, wherein" Figure 1 is a side view of a portable hand lever. punch embodying the novel features of my invention and illustratingin'dotted lines the'simple manner in which the punching element may be removed or replaced;

Fig. 2 is a similiar view with the punch in opened position; and v Fig. '3 is a cross-section taken on the line 83 of Fig. 1 looking in the direction indi cated by the arrows.

The punch comprises a head 5 providing upper and lower jaws 6 and 7 respectively, the jaw 6 serving as a guide to receive the shank 8 of the punching element 9, while the jaw 7 provides another guide in the form of a die block 10 into which the end of the punch 9 is arranged to be received in a well-known manner at the end of the punching stroke. The shank 8 of the punch has cross slots 11 on opposite sides thereof to provide a T-head 12 for reception in jaws 13 provided in the form of recesses in the front of a rocker arm 14 which serves in the accomfierial No. 106,847.

as the punch reciprocating element. The arm 14 is pivoted intermediate the ends thereof near the forward end on a bolt 15 projecting through a web 16 on the arm 14: and through aligned bosses 17 on the head 5. The bolt 15 is detachably secured in place by a knurled nut 18 threading on the end thereof whereby to permit the removal of the bolt so that the arm 14 may be swung away from the head, as indicated in dotted lines in Fig. 1, to withdraw the punch 9 from the head or to permit insertion thereof, it being apparent from Fig. 1 that the punch is also easily insertible in or detachable from the jaws 13 in the arm 1 1 when the latter is swung away from the head. It is obvious that a very simple operation is involved in the removal and replacement of punches.

The arm 14 is. arranged to be rocked in the relative swinging movement to and from closed position of a pair of operating levers 19 and 20. The former is pivotally connected to the. rearward end of the arm is by a stud or bolt 21 while the latter is pivotally connected with the rearward portion of the head 5 by a stud or bolt 22, the two levers being connected together by a third stud or bolt 23. The connections referred to are preferably made by having the end of the lever 19 bifurcated to embrace the end of the arm 14, as indicated in Fig. 3, and also to embrace a rib 24; projecting from the end of lever 20, the latter being also bifurcated, as indicated in Fig. 3, to embrace the end of head 5. The connections 21 and 22 arespaced in relation to the connection 23 which necessitates providing the ends of the levers 1 9 and in a cross head form, as illustrated. The heads 25 and 26 thus provided'on the ends of the levers l9 and 20 respectively, constitute the elements of toggle which is arranged to be opened and closed in the closing and opening movements respectively of the levers 19 and 20. The latter are provided at their free ends with hand grips 27 and 28, respectively, for operating the punch in the usual manner. It is obvious that the punch 9 is operated through the punching stroke by bringing the handles 27 and 28 together, thetoggle being opened by this operation, as indicated in Fi l. The punch is retracted when the handles are moved apart, as indicated in Fig. 2.

It will be apparent from the foregoing that the operation of the punch at no time necessitates the projection from the plane of the jaws 6 and 7 of any part or parts of the tool. This enables the operation on work which could not otherwise be taken care of. The tool can be inserted and operated in relatively confined spaces where punches of the ordinary type could not be used, the only limitation being the overall dimension across the head 5 and rocker arm 14:. In earlier types of'punches, a considerable restriction was imposed by reason of the fact that one of the operating levers extended over the arm 14 in order to be operatively connected therewith. The fact that the punch can be operated to produce holes close to an ad acent wall makes the present tool ideal for skylight work and work of a similar character, The span of the 6 and 7 it will be noted is comparatively ample and the length of stroke of the punch 9 is relatively long so that the punch will take work of a greater thickness than is usually accommodated. This is principally for that class of work where, by reason of several. pieces being laid together and not compressed into a conipactland solid thickness, the work assumes a bulky thickness requiring a longer stroke ofthe punch and, of course, a greater of the aws to receive the same. This cond ion is frequently met within skylight work. I

It is believed that the foregoing conveys a clear understanding of the objects of my invention and, while I have illustrated but a single working embodiment, it should be understood that changes might be made in details of construction without departing I from the spirit and scope of the invention as expressed in the appended claims.

I claim:

1. In a punch, a head, a punch element, a rocker pivoted on said head intermediate the ends thereof having the outer end thereof engaging said punch element to impart movement thereto, a pair of toggle elements pivetally connected. together, one of said elements being pivoted to said head and the other of said elements being pivoted to the inner end of said rocker, and a pair of handles extending from said toggle elements to open and close the tog le and communicate a rocking motion to said rocker, the

opening and closing of said toggle occurring in the clos ng and opening movements respectively of said handles.

- 2. In a punch, a head, a punch element, a

rockerpivoted on said head and arranged in the rocking movement thereof to communicate movement to said punch element, and a pair of operating levers pivotally connected togethenone of said levers being pivoted to said head and the other of said levers being pivoted to said rocker.

3. In a punch, a head, a punch element,a rocker pivoted on said head and arranged in a i l the-rocking movement thereof to communirelative to one another.

4. In a puneh, a head providing a pair of spaced jaws, a punch element slidable thereon between said jaws, a rocker arm having jaws in the forward end. thereof engaging projections on said punch element to communicate movement to the latter andto provide a detachable connection therewith, means intermediate the endsof saidrocker arm for pivotally mounting the latter-on said head, and a pair of handles having cross-head ends, one of said handleshaving its crosshead end pivoted at one side on said head, the other of saidhandles having its crosshead end pivoted at one side withsaid rocker arm, said handles having the other side of the cross-head ends thereof pivoted means intermediate the ends of said rocker 7 arm for pivotally mounting the latter on said head, said means providing a detachable connection between said arm and head whereby the arm may be swung away from said head to withdraw the punch element therefrom and permit the withdrawal of the punch element from theend of said arm, and

a pair of handles having cross-head ends one oi said handles having 1ts crossheadend pivoted at oneflside of'said head, the other of said handles having itscross-head end pivoted at one side with said rocker arm,

said handles having the other sidejof .the

cross-head ends thereof pivoted together.

6. In a punch, a head, a punch element, an

arm pivotally mounted on saidhead and engaging said punch element to operate the same when oscillated, and a pair of operate ing levers pivoted together and arranged in the swinging movement thereof to and from closed position to communicate movement to. said arm whereby to operate said punch, said levers having pivotal connections with said head and with said arm in spaeed'relation to the pivotal connection between said levers. i

In witness of the foregoing Iafiix myj HAROLD o. srnnonnn.

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