US1704830A - Metal-forming fixture - Google Patents

Description

March 12, 1929.

R. P. HECKMAN METAL FORMING FIXTURE Filed 00%. 18, 1926 Patented Mar. 12, 1929.

UNITED STATES PATENT OFFICE.

RICHARD P. HECKMAN, OF CHICAGO, ILLINOIS, ASSIGNOR T0 WATSON HURLBURT, OF CHICAGO, ILLINOIS.

METAL-FORMING FIXTURE.

Application filed October 18, 1926.

The invention relates to a construction where parts of the objects to be acted upon necessarily occupy a position directly beneath the punch, and underneath the matrix, during the operation of forming other parts of said object.

The objects of my invention are:

First :To get a clear space beneath the matrix of a width and height predetermined by the length and diameter of the object to receive the impression, parts of which may curve around and beneath when placed in position on the matrix preparatory to receiving its indentation.

Second :To construct a fixture for rapid operation and reduce production costs.

Third :--A fixture that can be installed and operated in either a foot or power press. I attain these objects by means of the various parts as illustrated in the accompanying drawings, in which Fig. 1 is a perspective view of the complete fixture, a hand being shown holding an object under the punch preparatory to being acted upon. The other hand (usually both hands are used) being left off to avoid obstructing the picture.

Fig. 2 is a cross section on line 22 of Fig. 1, showing the punch as having descended upon the work and forming the hook. The object in dotted lines under the punch illustrates the fact that objects of different diameters may be conveniently operated upon.

Fig. 3 illustrates a completed sleeve, hooks being formed on one end, reversing and formin the other end.

Simifiar numerals refer to similar parts throughout the several views.

Number 1 illustrates the bed plate of a common form of foot press, in which 2 is a side piece, the other being spaced away and not here shown. Between these two the long lever 3 swings on the fulcrum pin 4, the extension 5 of lever 3 actuates the sliding head 6 carryin the punch 7 through the medium of the ho der 8 and set screw 9. Matrix 10 has in it the V slot 11. The punch positioned relative to the object 13 in Fig. 2 and by having its working edge conform in a reverse manner to the V in the matrix forces the metal into the V causing it to take the form shown in Fig. 3 at 12. As this operation occurs the object is caused to swing about the point of the punch as its axis, finally resting in the position shown by 13 in Fig. 2. The hands Serial No. 142,507.

must hold the object so loosely that it quite easily assumes this position, else if held too firmly a deformation will occur in the uniformity of the curve, which is detrimental to the general appearance. An object of large diameter is subject to the same unfavorable results as the inertia of the piece itself is enhanced by the average greater distance of its parts from the axis of swing, but can be overcome by slowing up of the operation.

In placing the object in position on the matrix 10, it is forced against the stop 15 held against movement by screw 16, thus limiting the length of the hooks l2. Matrix 10 is supported by uprights 17 in Fig. 1 and its companion 17 shown in Fig. 2, being fastened to these by screws 18 and dowels 19. Uprights l7 and 1T may have extensions at the base taking the form of an ordinary die shoe and be held in position by bolts 20 and nuts 21 working in slots in the extensions and slots 23, a common form of construction in the base of the press. Uprights 17 and 17 may be made more rigid by the spanner 24 cast integral with the uprights.

1. claim:

1. The combination in a metal forming fixture, of a bed plate, a matrix, spaced away from the bed plate, a punch Which is the reverse of the matrix, end pieces to retain the matrix in spaced relation to the bed plate, and having lateral lugs, bolts securing the lugs to the bed plate, and a limiting stop.

2. The combination in a metal forming fixture of a bed plate, a matrix, spaced away from the bed plate, a punch which is the reverse of the matrix, and pieces upstanding from the bed plate. and attached to the matrix, and having lugs for holding down purposes, bolts attaching the lugs to the bed plate, a spanner upstanding from the bed plate, supporting the matrix, and a limiting stop.

3. The combination in a metal forming fixture, of a bed plate, a matrix plate the major portion of which is at one side of the center line of the punch and spaced away from the bed plate, a punch fitting the matrix, end pieces upstanding from the bed plate with means for attachment to the bed plate, and maintaining said matrix in spaced relation to the bed plate, means attaching the end pieces to the bed plate, a spanner upstanding from the bed plate attached to the end pieces, and supporting the matrix plate, and a limitin stop.

4. In a mac ine for crimping the margins of curved sheet metal forms, in combination,

5 a supporting member, a matrix, a punch for cooperating with said matrix, means for supporting said matrix in spaced relation to said supporting member and for providing a clearance directly beneath said punch for accommodating the free ends of said curved forms, and a limiting stop for positioning the form on the matrix.

RICHARD P. HECKMAN.

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