US614789A

US614789A - Apparatus for making punches

Info

Publication number: US614789A
Authority: US
Publication date: 1898-11-22
Anticipated expiration: 1915-11-22

Description

No. 6I4,789. Patented Nov. 22, I898.

A.. J. BRADLEY.

APPARATUS FOR MAKING PUNCHES.

(Application filed Jan. 7,-1895.) (No Model.) 2 Sheets-Sheet I.

Nb. e|4,7s9. Patented Nov. 22, I898.

- A. J. BRADLEY.

APPARATUS FOR MAKING PUNCHES.

(Application filed Jan. :7, 1895.) (No Model.)

2 Sheets-Sheet 2.

Illlll.

NrTEn STATES PATENT OFFICE.

ANDREW .I. BRADLEY, OF ST. LOUIS, MISSOURI, ASSIGNOR TO THE BRADLEY STENCIL MACHINE COMPANY, OF MISSOURI.

APPARATUS FOR MAKING PUNCHES.

srncI'Fr'cATI'oN forming part of Letters Patent No. 614,789, dated November 22, 1898. Application filed anuary 7, 1895. Serial No. 534,076 (No model.)

To all whom it may concern:

Be it known that 1, ANDREW J. BRADLEY, residing in the city of St. Louis, State of Missouri, have invented a new and useful Apparatus for Making Punches, of which the following is a specification.

My invention relates to the art of making punches, and has for its principal object to make punches at less cost than by the process in general use.

My invention consists in the apparatus hereinafter described and claimed.

In the accompanying drawings, which form part of this specification, Figure I is a vertical section through my apparatus, showing a blank in position to'be impressed. Fig. 11 is a sectional View showing the form of the blank as it has just been impressed by the forming master-die. Fig. III is a plan view of said apparatus, showing the open position of the chuck by dotted lines. Fig. IV is a perspective View of the forming master-die. Fig. V is a face view, and Fig. VI is an edge View, of the blank after it has been impressed.

A plunger or forming-die 1, having the design for the punch carried in intaglio in its face, is operated by any means adapted to exert the required pressure thereon-such, for instance, as an ordinary power-press.

For reasons hereinafter specified it is preferable to make the plunger with a separate face-plate 2, which may be made as female dies are ordinarily made or by punching metallic blanks, as set forth in Letters Patent granted to me July 10, 1894.

The blank to be shaped requires to be firmly backed or bottomed. For this purpose a substantial bed-plate 3 is used, which bed-plate is preferably adapted to be fastened to the table or bed-plate of a power-press below the forming or master die 1. This bed-plate 3 carries jaws 4:, adapted to move to and fro thereon in any suitable guides-as, for instance, by the beveled edges of the jaws sliding under projecting lips 5 of the bed-plate 3 in the nature of a dovetail. The meeting ends of the jaws have a right-angular or other form of recess, so as together to form a rectangle or other figure, according to the shape of the plunger and blank to be operated on, whereby the metallic blank is confined on all ing the design of the die.

sides while it is being operated upon. A convenient means for operating said jaws is a ring 6, rotatably secured on a circular raised portion of the bed-plate 3. Eccentric slots 7 are provided in said ring in a position to have pins 8, fixed on said jaws 4, fit therein. The

sides of the slot thus constitute cams, so that when the ring is rotated the jaws open or close according to the direction of motion. The end portion of each slot is extended concentrically to avoid the risk of the jaws opening when the plunger is lowered. Obviously other means may be used for operating said aws.

The lower edge portion of the meeting face of each jaw is beveled or flared downwardly or indented, as shown in Figs. I and II. The purpose of such bevel is to provide space for the metal displaced by the plunger 1 to enter, and thereby project underneath the jaws, so that when the plunger is retracted the projecting portions are engaged by the edges of the jaws and the blank consequently stripped from the plunger or forming-die 1. This being the function and operation of the bevel it is obvious that other recesses in the face of the jaws are mere modifications of the bevel and that a separate mechanical stripper might with some success take the place of the bevel. I

In order to prevent the blank sticking to the face of one of the jaws as they separate, a small hole 9 is made in the bed-platebeneath the plunger. The metal forced into this hole forms a kind of hook,which prevents the blank clinging to the jaw.

The operation of the apparatus is as follows: The blank 10 being heated to the predetermined temperature is laid on the bedplate 3 between the jaws 4. The ring 6 is then turned by means of its handle 11, thereby closing the jaws of the clamp tightly about the blank 10. The plunger or forming-die l is then forced against the blank with sufficient power to impress the design of the die sharply upon the blank. This pressure displaces the metal of the blank, forcing it into the bevel or other recess under the front edges of the jaws and into the small hole in the bedplate 3 as well as into the recesses constitut- By means of the bevel the blank is stripped off from the forming-die, which may be made to effect its purpose with a single quick stroke. The blank thus operated on may be mounted on any suitable shank to constitute a punch, or the shank may be made integral with the face portion by modifying the bed-plate or chuckjaws for that purpose.

hat I claim is 1. An apparatus for making punches, consisting of a forming-die, a bed-plate, and chuck-jaws, one or both of which are movable thereon and have a recess in their ad joining faces,substantially as and for the purpose set forth.

2. An apparatus for making punches, conpose set forth.

ANDREW J. BRADLEY. Witnesses:

J AMES A. CARR, JAMES J. ODoNoHoE.