US2500420A - Punch retainer - Google Patents

Description

March 14, 1950 J, KONlNG 2,500,420

PUNCH RETAINER Filed March 29, 1948 Inveni'or Arforneg5 Patented Mar. 14,. 1950 r OFICE 1 Claim. 1

This invention relates to a punch holder or retainer which in use is for holding a punch in a retainer block:v The block may beeither integral with a die plate, or separate therefrom, and adapted to be fixedly secured to it.

It is a. primary object and purpose of the present invention to provide a punch holder or retainer of a very simple, durable character, one which is economical to make, and with which removal or replacing punches is easily accomplished. An elimination of springs in the holder is of value. When springs are used, not only is there danger of dirt or other foreign material causing a spring or other parts to stick, but sliding the punch up and down to check the alignment thereof with the die with which it is used, or with a matching post, is not possible, While with my invention such movement is readily and easily accomplished.

Also with my invention a backing plate for the retainer block may be permanently secured in place either by welding or an equivalent permanent fastening or securing means. Thus with my invention there is no dismantling of the block which retains the punch from backing plate, which is common with other punch holders or retainers. The block which holds and retains the punch may be of any desired shape and size and may be supplied with holding or retaining means for the mounting of more than one of the punches as, for example, when. a multiple of holes are to he punched simultaneously. The holding detent or pawl is of a strong and sturdy character. The simplicity, sturdiness and economy inherent in my invention is a valuable feature thereof.

An understanding of the invention may be had from the fol owing description, taken in connecwith the accompanying drawing, in which,

Fig. 1 is a transverse vertical section through a punch retaining block and a backing plate therefor, a punch and the means for holding it being shown in elevation,

Fig. 2 is an under plan view of the retaining block with a punch held therein, the view being substantially on the plane of line 22 of Fig. 1, locking in the direction indicated, and

3 is a somewhat enlarged perspective View of the holding or retaining pawl which is used.

Like reference characters refer to like parts in the difierent figures of the drawing.

punch l which is to be held or retained, while shown of a cylindrical form may be of any other desired form or cross section, as the invention is applicable to various shapes and forms of punches. Said punch l at the end portion thereof where it is to be held is formed with a transverse horizontal recess 2 in a side thereof, as shown.

The retaining block 3 for the punch i has a hole for said punch i and similar holes for other punches may be made through an enlarged block when more than one punch is to be held. The hole is of a form that the recessed end portion of the punch is received therein. A backing plate l'is welded or otherwise permanently secured to the block 3 as shown, against which the adjacent end of the punch l engages. Said backing plate is permanently connected in place after the holding dog or pawl has been assembled with the block 3.

From the side of the block 3 over which the backing plate 5 is connected, a recess 5 is bored or otherwise made which extends toward but terminates short of the opposite side of said block 3. The recess 5 parallels the opening which receives the end portion of the punch l and is spaced 2. short distance from it. It is connected therewith by a longitudinal slot 6 which extends the full length of the pawl receiving recess 5. From the opposite side of the block 3 and substantially in axial alignment with the opening 5, passage l is bored and interiorly threaded. The recess 5, preferably, is of cylindrical form though not necessarily so.

A retaining dog or pawl 8 of the shape and form best shown in Fig. 3 is inserted and received in the opening 5. It has a rounded end 9 to bear against the inner side of the backing plate and an inclined opposite inner end l0. From the longer side of the pawl 8 and near the inner end thereof a heavy finger i i passes through the slot 5 and is shaped at its free end to be received in the recess 2 of the punch I.

A screw l2 having a conical inner end is threaded into the interiorly threaded passage 7. When said screw is tightened its conical end bears against the inclined inner end I!) of the dog 8, forcing the finger l i into the recess 2 and forcing the inner end of the punch l with pressure against the backing plate t. On unscrewing the screw 1 2 the dog 8 is free for a rocking movement to the right (Fig. 1), thus disengaging the finger I! from the recess 2 and freeing the punch i so that it may be removed.

It is evident from the foregoing description that the punch I may be adjusted lengthwise in the opening in the block 3 which receives it and moved back and forth for matching the punch with its associated die or matching post in properly setting the punch. The retaining or holding block 3 and the backing plate 4 may have openings as shown in Fig. 2 for the passage of bolts to secure the block to a suitable die plate or bed on a punch press. Of course the punch holding block 3 may be made a component or an integral part of a punch assembly carrying a plurality of punches, each independently held and retained in place by a mechanism identical with that described.

The structure described is practical and useful, all springs are eliminated, and due to its simplicity of structure there is little possibility of getting out of order. The punch retainer or holder is economically built and exceptionally strong and durable in service. All parts thereof are easily manufactured.

The invention is defined in the appended claim and is to be considered comprehensive of all forms of structure coming within its scope.

I claim:

In a structure of the class described, a block having a cylindrical punch receiving opening therethrough, a second cylindrical opening parallel to the first opening and extending partially through the block, a slot connecting said openings, and a screw threaded opening joining said second opening and in alignment therewith, a plate attached to the bottom of said block and covering the lower ends of said openings and slot, a pawl located in said second opening and having its lower end rockably mounted on said plate and its upper end inclined, a finger on the upper end of the pawl extending through said slot, and a screw threaded into said screw threaded opening, its lower end being pointed and engaging the inclined upper end of the pawl.

JACK A. KONING.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,784,911 Schlitters et a1 Dec. 16, 1930 1,797,986 King May 13, 1929 1,862,623 Harrington June 14, 1932 2,136,190 Gulfelt Nov. 8, 1938

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