US2031024A - Punch - Google Patents

Description

Feb` 18, 1936. R. AHLQUIST 9031,02

PUNCH Filed Jan. A111, 1955 Patented Feb. 18, 1936 UNITED STATES PATENT OFFICE 1 Claim.

'Ihis invention relates to punches and its general object is to provide a punching and cutting device that is primarily designed for use in making openings in sheet metal of various thick- 5 nesses in an easy and expeditious manner with very little effort.

Another object' of the invention is to provide a device that is capable of making a round opening that is uniform throughout its circumference and without flared or frilled edges.

A further object of the invention is to provide a device that includes a punching and cutting tool with an anvil block or die cooperating therewith, for use in making openings in sheet metal, and the device is simple in construction, inexpensive to manufacture and extremely efcient in use and service.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawing and specifically pointed out in the appended claim.

In describing my invention in detail, reference will be had to the accompanying drawing where-- in like characters denote like or corresponding parts throughout the several views, and in which:

Figure 1 is a view of the punching and cutting tool of my device and illustrates the manner of punching the guide hole prior to making the cut.

Figure 2 is a view of the anvil block or die and illustrates the relative position thereof with respect to the punching and cutting tool.

Figure 3 is a view partly in section with the parts of my device in associated position and just prior to cutting the opening.

Figure 4 is a view partly in section just after the opening is cut.

Figure 5 is a top plan view of the anvil block or die.

Figure 6 is a bottom plan view of the punching and cutting tool.

Referring to the drawing in detail, the reference numeral l indicates the handle of the punching and cutting tool of my device and which merges into a cylindrical body 2, the latter being of greater diameter than the handle l and being provided with a concaved bottom to provide an annular or circular cutting edge 3.

Depending from the center of the concaved bottom and formed integral therewith or otherwise secured thereto, is a stud 4 which is provided with a beveled lower end that forms a penetrating point 5.

The anvil block or die of my device is likewise of cylindrical formation and is indicated by the reference numeral 6. A bore 1 extends centrally through the block 6 for the purpose of receiving the stud 4, and formed in the top of the block is a recess shaped to provide an annular groove 8 and a convex portion 9 that extends to the bore l, and at the juncture of the convex portion with the bore, it will be noted particularly from Figure 3 that the portion 9 is inwardly flared as at l0 for the purpose of providing an annular pocket to receive the inwardly flared edge of the opening in the sheet metal A that is provided by the stud 4. when the metal is disposed upon the block with v the stud 4 arranged in the bore 1.

The top of the block beyond the recess is outwardly beveled to provide an annular or circular cutting edge ll that cooperates with the cutting edge 3 in providing a circular opening in the metal, as will be apparent upon inspection of Figures 3 and 4.

From the above description and disclosure of the drawing, it will be obvious that I have provided a device that includes a punching and cutting tool which cooperates with an anvil block or die in providing what may be termed perfectly round openings in sheet metal of various thicknesses, and such as brought about by the fact that a guide opening is rst punched in the metal, so that the stud 4 may be properly centered with respect to the block, as shown in Figure 3. The cutting edges and the association of the concaved bottom and convex portion cooperate in making a perfect opening or one without flared or frilled edges and of the same diameter throughout the circumference thereof.

It is thought from the foregoing description that the advantages and novel features of my invention will be readily apparent.

I desire it to be understood that I may make changes in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claim.

What I claim is:

A punching and cutting device comprising an anvil block having a bore centrally arranged therethrough and a recess in its upper end, said recess being shaped to provide an annular groove with a convexed portion extending inwardly therefrom to the bore, and surrounding the latter, said block having its upper end beveled outwardly beyond the recess to provide a cutting edge at the juncture of the bevel portion with the recess, cutting and punching means including a handle, a cylindrical body formed on the handle and having a concaved bottom cooperating with the convexed portion and providing an annular cuttingA edge cooperating with the cutting edge first mentioned and the groove respectively, and a stud extending centrally from the concaved bottom to be received in the bore and being provided with a beveled free end forming a penetrating point.

GUSTAF R. AI-ILQUIST.

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