US2594552A

US2594552A - Angular piercing tool

Info

Publication number: US2594552A
Application number: US5745A
Authority: US
Inventors: Neil B Granberg
Original assignee: AO Smith Corp
Current assignee: AO Smith Corp
Priority date: 1948-02-02
Filing date: 1948-02-02
Publication date: 1952-04-29
Anticipated expiration: 1969-04-29

Description

Apr 1952 N. B. GRANBERG 2,594,552

ANGULAR PIERCING TOOL Filed Feb. 2, 1948 2 SI'IEETS SHEET 2 i l l i I I i z I 8" I L I l l Nez'ZB. Gmn/aerg INV ENT OR.

BY ZZQKAMM ATTORNEY.

Patented Apr. 29, 1952 UNITED PATENT OFFICE Neil B; Granb'erg, Milwaukee,,Wis assignor to A. or 'S nithQQYPQratiOn, Milwaukee, Wis., a

corporation of New York Applic tion Februar 2, rent, seen No. 5,745 2 Claims. (outt -st) This invention relates to punch presses and the likeand particularly to a paratus for riveting or punching holes angular-1y to the stroke 'of the press.

An object of the invention is to provide an apparatus which is easily and quickly set up tor use with a standard press to operate singlyforsimultaneously with other work operations of thepress' and which is simple and economical to construct. Another object is to provide an angular piercing or riveting tool having a push rod which is not mechanicall fastened to the press punch and which, therefore, need not be accurately machined or aligned for assemblywith the press.

Another object is to provide a floating drive connection between thepress and the angularly directed punch to eliminate expensive machine parts. Another object is to provide a punch press assembly which is readily set at various positions without realignment with the driving members.

These and other objects and advantages ofthe invention will appear hereinafter in connection a with the following description of an embodiment of the invention, as illustrated in the accompanying drawings.

In the drawings:

Figure 1 is a front elevation at the tool showing the punch holder in its raised or retracted position with parts being shown in section:

Fig. 2 is a side elevation of the assembly of Figure 1; H v

Fig. 3 is a front elevation (if the tool with the punch holder advanced to its lower position;

Fig. 4 is a view similar to Fig. 3 but with the punch at the end of its working stroke; and

Fig. 5 is an enlarged detail sectional view of the punch and its adjacent parts, shown in the same position as in Fig. 4. i

The invention comprises, in general, a base I supporting the die 2, an upper plate member or platen 3 which is adapted to be secured to the press, not shown, and to move upwardly and downwardly therewith, and an intermediate stripper bar member 4 supporting the punch 5 and operating mechanism therefor.

Base I and

members

3 and 4 are of substantial thickness and of sufficient length to accommodate, on either side of the punch, guide pins 5 which extend downwardly from member 3 near opposite ends thereof and through holes I aligned therewith in member 4. Tubes 8 extend upwardly from base i in alignment with holes I to provide bearings for the lower ends of pins 6. Tubes 8 receive the guide pins 6 and thereby op- 2 pose the side thrust of the tool when the punch is operated, as will be described.

Bosses '9,- which are of the same diameter as tubes 8, project downwardly from member 4 in alignment with tubes 8 and engage tubes 8 to limit the downward positioning movement of the punch earriedb said member '4.

Bbsses ID are disposed on the underside of upper plate member 3 to provide sockets of substantial depth for attachment of guide pins 5 to the plate. Two spaced rods II are secured to member 3and extend downwardly through mernper 4. Rods l l are threaded at their upper ends for threading the same into member 3 andare provided with heads 12 at their lower ends. The rods H are provided to lift the punch assembly during the return stroke of the, press after the withdrawal of the punch from the work, as will be described.

A the block I3 is welded or otherwise secured to the base I. Die 2 is seated in block [3 at the desired angle and location to receive punch 5.

A tubular punch support l4 integral with membe'rj4 carries punch 5 atthe desired angle and in alignment with die 2 when the member4 is in its-lowered position. Punch support l4 may be welded to the underside of plate 4 or may be cast therewith.- A bushing I5within thelower end of tube l4 supports the punch 5 and allows free longitudinal movement thereof in the tube. A snap ring I5, seated in an annular groove IT in tube I 4, secures bushing l5 within the tube.

A An annular member I8 is welded to the endplate 19 at the lower end of the tube 4 and serves as a stripper for the punch which extends them '14 on the upper end r the punch to bias the latter upwardly. A rod 22 extends upwardly in bore 20 from head 24 and universally supports a push rod 23 which in turn extends upwardly into a recess in platen 3.

In operation, the punch 5 is moved downwardly against the biasing action of a spring 2| by a pair of

rods

22 and 23 actuated by the upper movable plate member 3. The lower rod 22 is disposed in bore 20 in intermediate plate 4 and tube M. A cap 24 fits over the upper end of punch 5 beneath rod 22 and is secured to the punch 5 by means of a set screw 25. The cap 24 supports the upper end of punch 5 within the bore 20 and provides a shoulder 26. The spring 2|, encircling lower end of rod 23.

The upper end of rod 23 is spherical and is seated in a cone-shaped recess 28 in the lower surface of member 3. A neoprene gasket 29 serves to retain rod 23 within the recess.

In the downward stroke of the press, the punch assembly moves downwardly with upper plate 3- 2 until the bosses 9 of intermediate member 4 reach the guide tubes 8 extending upwardly from base I at which time punch 5 is in alignment with die 2 and the hold-down member I8 is adjacent the work. As the upper member 3 continues to move downwardly, the

rods

23 and 22 push the punch downwardly in tube l4 to eifect the angular working stroke.

In the return stroke of the press, the upper member 3 is raised and spring 2| biases punch 5 upwardly within tube M to retract the punch from the work with the member [8 acting as a stripper to strip the work from the punch. The heads I 2 of rods ll then engage member 4 and lift the entire punch assembly away-from the base I and die 2.

The punch assembly is easy to adjust and set up for different work and does not require periodic adjustments to maintain the punch in alignment with the die.

The tool is easily adapted for use with any press and is simple and inexpensive to construct of standard materials. The tool may be employed as a punch or as a riveting instrument.

Various embodiments of the invention may be employed within the scope of the accompanying;

claims.

I claim:

1. A tool assembly of the class described, comprising a diefor supporting a workpiece, a platen disposed to move bodily toward and away from" the workpiece in the cycle of a punching operation, an intermediate platen disposed between said first named platen and said die and disposed to move in the direction of movement of said first named platen, a punch unit carried by said platen and having a lost motion to provide for continued movement of said first platen after said second platen is stopped by said limiting means, and means carried by said first named platen and universally engaging said punch to force the same angularly toward the workpiece upon continued movement of said first named platenafter the intermediate platen has reached the limit of its movement toward the workpiece.

2. A tool assembly of the class described, comprising a die for supporting a workpiece, a platen disposed to move bodily toward and away from the workpiece in the cycle of a punching operation, an intermediate platen disposed between said first named platen and said die and disposed to move in the direction of movement of said first named platen, means to carry said intermediate platen by said first named platen and providing lost motion therebetween whereby said first named platen has a longer movement than said intermediate platen in the cycle of a punching operation, a punch unit carried by said intermediate platen with the punch thereof disposed to move at an acute angle to the direction of movement of said intermediate platen and toward and away from the workpiece, means to limit the movement of said intermediate platen toward the work short of completion of the movement of said first named platen toward the work and at a position of alignment between said punch and die, and a push rod disposed between said first named platen and the upper end of said punch and universally movable with respect to each whereby the punch is forced angularly toward the workpiece upon containued movement of said first named platen after the intermediate platen has reached the limit of its movement toward the workpiece.

. NEIL B. GRANBERG.

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

UNITED STATES PATENTS Number Name Date 665,175 Carpenter Jan. 1, 1901 1,460,697 Bendlin July 3, 1923 1,766,214 Booth June 24, 1930 1,812,046 Groehn June 30, 1931 1,920,303 Grotnes Aug. 1, 1933 1,935,854 McCreary Nov. 21, 1933 2,373,962 Joachimi Apr. 17, 1945 2,410,372 Wales Oct. 29, 1946 2,421,864 Becker June 10, 1947 FOREIGN PATENTS Number Country Date 440,076 Germany Jan. 27, 1927