US2317791A

US2317791A - Punch and die

Info

Publication number: US2317791A
Application number: US437667A
Authority: US
Inventors: Miller George Henry
Original assignee: Individual
Current assignee: Individual
Priority date: 1942-04-04
Filing date: 1942-04-04
Publication date: 1943-04-27
Anticipated expiration: 1960-04-27

Description

April 1943- I G. H. MILLER I 2,317,791

' I PUNCHES AND DIE 7 I Filed April 4. 1942 Patented Apr. 27, 1943 UNITED STATES PATENT ()FFICE PUNCH AND DIE George Henry Miller, Dearborn, Mich. Application April 4, 1942, Serial No. 437,667

1 Claim.

My invention relates to punches and dies.

are

First. To provide a punch that can be tried for alignment with the die before the punch retainer is bored or reamed to size. This is an advantage when there is more than one punch in the same retainer, corrections for perfect alignment are made by tilting the reamer and reaming to finished size.

Second. To provide a quick change punch whose shank or body has neither a protruding head or recess to keep the punch in the retainer while stripping itself from the piece on which work was done. The punch is held in the retainer by a pressed fit.

Third. To provide a shank or body that can be used inverted, that is, the working end of the punch could be at either end of the shank or body. Similar numerals refer to similar parts throughout the different views. The term shank or body used herein refers to that part of the punch between the line 3 and the backing plate 4 in Figure 1.

I attain these objects by the punch illustrated in the accompanying drawing in which Figure 1 is a vertical section, and Fig. 2 is a plan, showing two methods of removing the punch I from the punch retainer I6.

Figure 2a is a view of a modification of the punch holder.

Fig. 3 shows an arrangement for removably mounting large punches.

Fig. 4 is showing the punch shank or body used inverted, the working end being on the small end. The retainer is removed when the punch is changed.

The punch I in Figure 1 has a tapered shank or body 2, that is, the diameter next to the backing plate 4 being maller than the diameter at line 3, the flat 5 is only put on punches whose working end 6 is other than round and then the punch is held in position by the key I, the wedge ejector 8 is used to remove the punch and is actuated improvements in The objects of my invention by a blow on pin 9, or by the cone screw Ill as is shown in position in the die retainer I I in Figure l. The punch I may also be removed by the direct action of pin 9 on chamfer I2 through slot I3 in the retainer plate I6, as shown in Figure 2. The dotted lines I4 show the proposed maximum diameter of the working end 6 of the punch in proportion to the shank or body 2 which will strip itself from stock whose thickness is that of the diameter shown by dotted outline I4.

The die I5 in Figure 1 has a tapered outside diameter and is used here to show one method of removing the die by the cone pointed screw Ill. I do not make any claims for the die I5. I recommend a taper of 4 inch per foot on the shank or body of the punch.

Fig. 2A shows a punch I having a tapered shank or body 2 seated in a punch retainer I6 and removable-by means of a wedge ejector 8 the same as in Fig. 1, except that the wedge ejector 8 is actuated by the cone pointed screw IS, in the same manner as the die shown in the lower portion of Fig. 1.

It will be seen that I have provided a punch having a tapered shank or body'mounted in a simple retainer arrangement such that a punch can be perfectly aligned with a die and retained by a pressed fit so that it is always tight in the retainer and yet may be easily and quickly removed, reground and replaced in its previous operative position relative to the rest of the die and thereby providing for saving many hours of labor in die and punch construction and upkeep.

I claim:

In combination, a punch tool having a tapered shank with the small end disposed remotely from the tool, a retainer plate having a tapered aperture suitable for snugly receiving the tapered tool shank for supporting the tool in extended relation from the retainer plate, a backing plate on the side of the retainer plate remote from the tool, a wedge ejector having tapered surfaces on both opposite ends, a guide recess slidably supporting said wedge ejector with one tapered end adjacent the small end of the tapered tool shank for wedging between the tool shank and the backing plate to eject the tool, an actuator aperture extending from the guide recess through the retainer plate, said actuator aperture having internal threads, and an actuator screw in said aperture having a conical inner end for engaging the other tapered end of the wedge ejector to force it into wedging engagement with the end of the tool shank.

GEORGE HENRY MILLER.