US855765A - Punching and shearing machine. - Google Patents

Description

No. 855,765. PATENTED JUNE 4, 1907.

R. GBRLAOH.

PUNGHING AND SHEARING MACHINE.

APPLICATION FILED JUNE 24, 1905.

UNITED STATES PATENT orrion.

ROBERT GERLAOH, OF BUFFALO, NEW YORK, ASSIGNOR TO BUFFALO FORGE COMPANY, OF BUFFALO, NEW YORK.

Specification of Letters Patent.

Patented June 4, 1907.

Application filed June 24, 1905. Serial No. 266,726.

To aZZ whom it may concern:

Be it known that I, ROBERT GERLAOH, a citizen of the United States, residing at Buf-. falo, in the county of Erie and State of New York, have invented a new and useful Improvement in Punching and Shearing Machines, of which the following is a specification.

This invention relates to metal punching and shearing machines more particularly of the portable and hand actuated types employed for blacksmith and general shop work.

The object of the invention is to produce a machine of the character described of inexpensive and exceedingly simple construction, which involves the minimum number of parts arranged to the best advanta e so as to produce a very strong and powerfu machine which is lighter and more compact than known machines of equal capacity.

In the accompanying drawings: Figure 1 is a perspective view of a combined punching and shearing machine embodying the invention. Fig. 2- is a fragmentary section thereof, on an enlarged scale, substantially in line 22, Fig. 1. Fig. 3 is a fragmentary 'perspective view of a combined punching and shearing machine of modified construction.

Like letters of reference refer to like parts in the several figures.

A represents a standard upon which all of the working parts of the machine are mounted. This standard consists of a single flatsided steel or wrought metal plate, such as armor or boiler plate, and is mounted on and held in upright position by a suitable base B. The machine shown in Fig. 1 is of the portable kind and the base B is provided with truck wheels I) which enable the machine to be rolled about from place to place. The improvements are not, however, confined to a portable machine and the standard may be mounted on any other suitable base or suport. p C represents a reciprocating punch head or slide in which the punch c is removably secured in any usual or preferred manner enabling the ready interchange of punches of different sizes. The punch slide is guided and confined in a holein a guide block 0 which is preferably slotted to embrace the plate standard to which it is bolted or otherwise rigidly secured above an opening D provided in the standard to enable the work to be placed beneath the punch.

E represents the bed block or die holder which rests on the standard at the lower side of the work opening and is slotted at its bottom to straddle the standard to which it is bolted or otherwise rigidly secured. The die holder is provided in its upper portion with a longitudinal channel or seat for the usual die F which is preferably provided with a series of punch holes of different diameters and is adjustably securedin proper relation to the punch by set screws f passing through the die holder and engaging the die. As the die holder bears on the lower edge of the work openin in the standard its securing bolts are relieved from the strain, which would otherwise fall upon them. The front edges of the die holder and standard are cut away at g beneath the die to permit the escape of the slugs punched from the work.

The punch is operated by suitable lever mechanism, which in the construction shown in Figs. 1 and 2 is arranged as follows: H

represents a punch lever consisting of two fiat steel bars located on opposite sides of the plate standard and fulcrumed to the latter by a pivot or pin it passing through the lever bars and standard above the punch slide. The punch lever is connected to the punch slide by two links h pivoted to the punch slide and lever. The pivot pin k connecting the links and punch lever passes through and works in a slot k in the standard indicated by dotted lines, Fig. 1. The long arm of the punch lever is connected by links 0'. with a hand lever I. The hand lever shown has a forked inner end straddling and fulcrumed to the standard and two sockets i for the usual removable handle, not shown. The flat central steel plate standard is thick enough to give the necessary bearing for the lever fulcrums and yet as the plate is flat and very much thinner than a cast standard of like strength, the bars of the lever can be arranged directly against the faces of the plate standard and close together. This enables the use of a short fulcrum and also allows the links connecting the lever and punch slide to be located close beside the punch slide without increasing the width of the latter. The pivot pin connecting the links to the punch LOO slide is thus also shortened and much less liable to bend than a longer pin connecting links spaced farther apart.

The machine thus far described could be used as a punch alone but preferably a shearing tool is combined with the punch in the one machine. In the construction shown in Fig. 1 the shears are arranged above the punch at the same side of the standard, but the relative arrangement of the punch and shears may be different.

K represents a stationaryshearing blade which is rigidly bolted to one face of the standard above a work opening is therein. The blade is set in a rabbet in the standard to provide an abutting shoulder k" for the blade to relieve the securing bolts from shear.

The movable shear blade K is carried by a lever or jaw consisting of two bars L at opposite sides of the standard and fulcrumed thereto by a pin or bolt Z. The movable blade K and a spacing block Z are bolted between the bars of the lever and rest on shoulders Z provided on the insides of the j aw bars to relieve the securing bolt. The movable blade K is also preferably provided with a shoulder Z which bears on top of the spacing block to better hold the blade. The lever or jaw L is operated by the punch. lever, to which it is connected, as by links m pivoted to the two levers.

N, Fig. 2, represents a work rest which is secured to that side of the standard on which the stationary shear blade is located to hold the work from tilting under the action of the shear blades.

The advantages of the central plate standard above pointed out in connection with the punch apply with equal force to the shears, whether employed alone or in a combined. punching and shearing machine.

The punching and shearing tools can be combined in other relations in a machine having the central plate standard such as described. For instance, Fig. 3 illustrates a machine in which a punch O is arranged at one edge of a plate standard P and a pair of shears Q at the opposite edge of the standard. In this machine the punch and movable shear blade are connected to punch and shear levers p and g which are connected by independent links 29 g, respectively, to a hand lever R. The punch and shear levers, in this construction, as in that previously described, each consists of two bars arranged against the opposite sides of the flat plate standard, enabling a similar advantageous arrangement of the fulcrums, pivots and connecting links.

A punching or shearing, or combined punching and shearing machine constructed as described with the central steel plate standard is a decided improvement over the 31d style machines having cast metal frames or standards, because the tensile strength of the steel plate is greater than a casting of much greater thickness and it enables a much more compact arrangement of the levers, links and pivots with the stated beneficial results. In fact it has been necessary in cast iron machines of less capacity to use two or three heavy frame castings each of much greater thickness than that of the single central steel plate, thereby not only greatly increasing the bulk and weight of the machine but also greatly adding to the cost of manufacture in properly matching and machining the various parts. The central plate is also more desirable than two spaced frame plates of less thickness than the central plate arranged on opposite sides of the working parts of the machine, for it is necessary to provide the thin plates with separately secured boxes to afford the necessary bearing area for the lever pivots, and these boxes must be applied with care requiring considerable labor and are constantly working loose and breaking.

The machine is described in this application as provided with punching and shearing tools only. It will be manifest, however, that the same construction would be useful for machines provided with other sorts of tools for working metal, and it is not desired to limit the invention to punching and shearing machines only.

I claim as my invention:

1. In a machine of the nature described, the combination of a flat-faced plate stand.- ard, a lever consisting of connected plates or bars arranged at opposite sides of said plate standard and fulcrumed thereto, and a tool comprising a stationary member secured on said plate standard substantially in the plane thereof, and a co-operating movable member arranged. in a plane between said lever plates and operatively connected thereto, substantially as set forth.

2. In a machine of the nature described, the combination of a plate standard having opposite flat faces, a jaw consisting of two connected bars arranged against the opposite flat faces of said plate standard and movably supported thereon, a stationary cutting member mounted on said standard substantially in the plane thereof, and a movable co-operating cutting member arranged between and secured to the bars of said jaw, substantially as set forth.

3. In a'machine of the nature described, the combination of a plate standard having opposite flat faces and provided with an opening, a movable jaw consisting of two connected bars arranged at opposite sides of said standard'at one side of said opening, a stationary shear blade mounted on said standard at the opposite side of said opening, and a movable shear blade arranged in said opening between-and secured to the bars of said jaw, and means for operating said jaw, substantially as set forth.

4. In a machine of the nature described, the combination of a plate standard, a lever consisting of bars arranged against the 0pposite faces of said plate standard and fulcrumed thereto, a stationary shear blade secured to said plate standard, a jaW consisting of bars arranged against the opposite faces of said plate standard and movably connected thereto, a movable shear blade secured be tween said bars of the j aw, and means connecting the jaw and said other lever, substantially as set forth.

5. In a machine of the nature described, the combination of a plate standard, a lever consisting of bars arranged against the opposite faces of said plate standard and fulcrumed thereto, a punch die mounted on said plate standard, a punch slide connected to said lever, a stationary shear blade secured to said plate standard, a movable shear blade, a jaW carrying said movable shear blade and consisting of bars arranged against the opposite faces of said plate standard and fulcrumed thereto, and operating meansfor said punch lever and shears jaw, substantially as set forth.

Witness my hand this 15th day of May,

ROBT. GERLAOH. l/Vitnesses WM. L. Fox, E. J. COLEMAN.

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