US1761207A - Punch - Google Patents

Description

June 3, 1930. A. E. GUERTIN PUNCH Filed July 26. 1928 Patented June 3, 1930 AUGUSTUS E. GUEBTIN, I BELMONT, MASSACHUSETTS PUNCH Application lel July 26,

My invention relates to punches and particularly to punches Ifor use in making gaskets and the like, the object of the mventlon being to provide an improved hand punch of this class by means of which bolt holes may be accurately and expeditiously formed 1n gaskets. It is also an object of the invention to provide a hand punch outfit or kit including a single cutter holder constructed with means whereby to separably couple or connect a cutter to the same, and a pluralit of clrcular cutters of various sizes, either o which may be coupled to, or connected with, said holder so as to serve as a complementary part thereof.

To these ends I have providedan lmproved punch, and also an improved punchmg outlit or kit, having the peculiar features of construction and mode of operation setV forth 1n the following description, the novel features of the invention being particularly polnted out and deiined in the claim at the close thereof.

In the accompanying drawings Figure 1 is an elevation, partly 1n sectlon, of my improved punch.

Figure 2 is a view like Fig. 1, butwith the holder and its cutter shown in the posltlons occupied by them at the completion of the cutting stroke.

Figure 3 is a detail of the spllt ring hereinafter described.

Figure 4 is a sectional detail hereinafter described.

Figure 5 is a view showing a set of cutters for use with the holder hereinafter described.

The main feature of my invention resides in the construction of the improved punch shown in Figs. 1 and 2 with which I preferably provide a set of complementary cutting tools, or cuttersisuch as shown in Fig. 5.

The punch of Figs. 1 and 2 comprises a body 1 herein shown as a metal bar formed interiorly and at one end thereof with a chamber or socket 2. At its outer 'or lower end the chamber 2 is counterbored to adapt it to receive a circular cutter 3' that is part of a cutting unit. In Figs. 1 and 2 this cutting unit is designated b and in practice I provide ma. serial no. 295,481.

a set of these units of different sizes as shown in Fig. 5.

The circular cutter 3 of each cutting unit is mainly of conical form but at its upper end is made with a cylindrical body portion 4 to t 55 Within the counterbore at the lower end of the socket or chamber 2, said counterbore providing an annular shoulder 5 which serves as an abutment for the inner end of the circular cutter 3. The cylindrical portion 4 is 00 formed upon its exterior with a circumferential groove 6 that is occupied by a split spring wire rin 7 that engages an annular groove 8 provi ed in body 1 adjacent the lower or outer end of the chamber 2, thereby to lock the cutter 3 to said body but'with provision for removal of the cutter when changing from a cutter of one size to a cutter of another size. Thus by holding the body l and applying endwise force to the cutter it can ,70 be forced into, or Withdrawn from, the chamber 2, the split ring 7 yielding to permit the same when suiiicient force is applied as dcscribed.

The cylindrical body portions 4 of all of the 75 cutters of Fig. 5 are of the same diameter so that either one of said cutters may be forced into position within the counterbore of the chamber 2 where it is locked and held against accidental loss by the split ring 7, and when it is desired to substitute another cutter of another size, the one that is in position within the holder can be withdrawn and the new cutter substituted very uickly;

The cutter 3 of eac cutting unit is an an- 85 nulus made with a cylindrical bore Within which is slidably mounted a pilot-ejector plunger 9 provided at its inner end with a head 10 that is held against the 'inner end of the cutter annulus by means of a coiled spring 11 within chamber 2. The outer end of the pilot-ejector 9 is preferably bluntly pointed as at 12, and as shown in Figs. 1 and 5 a considerable length of the outer end portion of each pilot-ejector projects beyond its cutter annulus 3.

Thus, after properly marking on the gasket G the positions of the holes that are to be punched therein, the axis of the punching tool'shown in Figs. 1 and 2 can be accurate- 100 ly positioned with respect to each mark by placing the point 12 on the latter. The holder or body 1 is then pushed downward until the lower cutting edge 13 of the cutter 3 rests on the gasket G whereupon the upper end of the holder or bod 1 is struck wit a hammer thereby driving t e cutter through the gasket as shown in Fig. 2. When the tool is raised from the work the plunger 9 holds the cutout down against the work support W, the

sprin 11 expanding as body or holder 1 is raise until the head 10 at the inner end of the ejector-pilot 9 engages the inner end of the cutter annulus 3.

From the above description it will be clear that I have provided an improved punch which can be expeditiously and accurately operated, the plunger 9 serving the double purpose of a pilot for use in positioning the punch upon the work, and as an ejector for removing the cut-out from the cutting annulus.

It will also be clear that the above described outfit provides simple, inexpensive and efficient means for use in punching several different kinds of holes in gaskets orthe like.

What I claim is:

A hand punch comprising a body member consisting of a bar of metal made interiorly with a chamber that extends to one end of said body, said chamber being formed to provide an annular shoulder ad]acent said end and to provide an annular groove bet-Ween said shoulder and said end; a cutter annulus having a body portion fitting telescopically within the outer end portion of said chamber and against said shoulder, said body portion being made upon its exterior with an annular groove reglstering with the groove within the chamber, and a resilient spllt ring loosely and permanently occupying the groove of the cutter annulus and removably confined within the groove of the chamber to separably hold the cutter annulus within t-he body member, a pilot-ejector plunger slidably mounted within said cutter annulus and provided at its inner end with a head engaging said annulus to limit its outward movement, and a spring Within said chamber yieldingly holding said plunger at the limit of its 'outward movement with its outer end portion projecting beyond said cutter annulus.

Signed by me at Boston, county of Suffolk, State of Massachusetts, this 10th day of J uly,

AUGUSTUS E. GUERTIN.

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