US2884043A

US2884043A - Sheet metal working tool for automobile bodies

Info

Publication number: US2884043A
Application number: US334627A
Authority: US
Inventors: William A Stevenson
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-02-02
Filing date: 1953-02-02
Publication date: 1959-04-28
Anticipated expiration: 1976-04-28

Description

April 28, 1959 w. A. STEVENSON 2,884,043

. SHEET METAL WORKING TOOL FOR AUTOMOBILE BODIES Filed Feb. 2, 195a William A. SfeVenson INVENTOR.

SHEET METAL WORKING TOOL FOR AUTOMOBILE BODIES William A. Stevenson, Spokane, Wash. Application February 2, 1953, Serial No. 334,627 2 Claims. 01. 153-39 This invention is .a sheet metal working tool for automobile bodies and is an improvement over the invention of William E. Lund, Serial No. 244,555, filed August 31, 1.951, for Pecking Tool, now U.S. Patent No. 2,694,435 issued November 16, 1954 of which I :am the assignee of the full right, title and interest.

An object of this invention is to provide an inexpensive sheet metal working tool for the automobile body-repair industry.

- Another object of the invention is to provide a sheet metal workingtool which comprises a minimum numberof parts arranged in such a way as to be very-inexpensive to'manufacture and not liable to become inoperative.

Another object of the invention lies in the provision of a sheet metal working tool which has a reciprocable hammer therein and a cushioning means rearwardly of the hammer for retarding the rearward movement of the hammer and preventing its striking the rear closure for the tool.

Another object of the invention lies in the provision of an improved reciprocating hammer for tools of the class disclosed.

These and other objects of the invention will become apparent during the course of the following description.

In the accompanying drawings, forming a part of this specification, and in which like numerals are employed to designate like parts,

Figure 1 is a longitudinal cross section taken through an embodiment of the invention;

Figure 2 is a perspective view of the head for associafion with the tool;

Figure 3 is :a perspective view of the peen .adapted to be pivotally carried by the head;

Figure 4 is a longitudinal fragmentary cross section of a modified form of the tool showing parts in elevation; and

Figure 5 is an exploded isometric view of an improved hammer.

Referring now more particularly to the drawing, I have shown the tool as having a head which is provided with a reduced externally threaded portion 11 and an enlarged portion 12, which together define a shoulder 13 intermediate the two portions. The enlarged portion 12 is provided with flattened faces 14 diametrically disposed with respect to each other to provide means for securing a wrench to the head for application and removal thereof. A longitudinally extending slot 15 is milled in the head and communicates with a transversely extending slot 16 milled diametrically of the reduced portion 11 of the head. The slot is provided to contain the pivotal peen 17. Axially aligned holes 13-18 are drilled through the reduced portion of the head parallel with its diameter and offset therefrom. A pivot pin 19 is passed through the holes 18-18 and through the pivot aperture 20 of peen 17 and thus pivotally mounts the peen in the head 10.

The peen is formed with a flat body 21 shaped in an obtuse angle having the pivot aperture 20 in the body at the apex of the angle. One leg'of the angle constitutes an anvil 22 and the other leg supports a metal working lip 23 which is disposed substantially in parallel offset relation to the anvil leg. The lip 23 is formed wedge- Shaped and has its side corners bevelled as at 24 and the" peen 17 is tempered to provide a metalworking tool which will not be distorted by working sheet metal in The lip 23 may have othersh-apes. if.-

automobile bodies. desirable. The head is threadedly engaged in the forward end of the cylindrical or tubular body 25 which is internally threaded at 26. The body is provided with air-escape ports 27 drilled therein. A reciprocable hammer 28 is slidably carried within the body and is of substantially the same diameter as the inside diameter of the body 25,

forcing the 'lip 23 outwardly of the head for the purposeof working sheet metal. I e

The rear face 31 of the hammer has an axial boss 32 which is provided with a transverse bore 33 and constitutes an eye carried by the rear face 31 of the hammer.

A resilient rubber washer 52 encircles the boss 32'1and is thereby secured in covering relation to the 'rear face 31.

The rear end of the body 25 is also internally threaded as at 34' and a closure or plug 34, having a reduced externally threaded portion 35 and an enlarged outer portion 36 defining a shoulder 37, is threadedly engaged in closing relation to the rear end of the body 25. The closure 34 is provided with a further reduced forwardly projecting extension 51 which is formed to provide ade quate length to the closure 34 so that the axial bore 39 is of a length to adapt it to completely contain the tension spring 40, which has its forward end 41 hooked in the eye of hammer 28. The rear end of the spring is secured about a pin 42 having its ends carried in spaced transverse openings 43 drilled in the closure 34. The bore 39 is internally threaded at its outer end to receive a conduit 44 which contains a valve (not shown) and communicates the hammer with a fluid pressure sup ply (not shown).

The shoulder 37 of the closure 34 and the shoulder 13 of the head 10 bear against the edge end faces of the body 25 to secure the head and closure against rotary movement relative to the body. Theclosure 34 is also provided with the diametrically opposed faces 14 upon which a wrench may be used to place or remove the parts.

In Figure 4 l have shown a modified form of the hammer which has the same body 25 excepting that the exhaust ports 27 may be omitted, as air forced by the for ward movement of hammer 28 will pass through the

milled slots

15 and 16 to the atmosphere.

A spring 45 of the expansion type is placed in the body forwardly of the hammer and it bears against the inside face of the reduced portion 11 of the head 10 and against the hammer. Since it is necessary for the hammer to shift forwardly sufficient distance to strike the anvil 22, the hammer 46 has been provided with a reduced forward end portion 47 providing a space between the forward end portion of the hammer 46 and the body 25 to receive the expansion spring 45. The rear end 48 of the hammer is of substantially the same diameter as the internal diameter of the body, being reduced only enough to provide free reciprocable movement of the hammer, and this portion may be provided by turning the hammer from one piece of stock or by pressing the sleeve indicated at 49 in Figures 4 and 5 onto the reduced por E eri s AP!" 3 5.

tio'n 4'7. This construction forms a shoulder 50 intermediate the forward reduced portion and the rear portion 48 and provides a bearing surface for expansion spring 45.

, Spaced forwardly from the closure 34", indicated in Figure 4, are vents 51. The closure 34" is of the same construction as the closure 34 excepting the forwardly projecting extension 38 is omitted and the openings 43 are not formed therein.

The axial bore 39, having internal threads, is necessary to communicate the tool with the source of fluid under pressure. As the valve in the conduit 44 is opened, the fluid under pressure drives the

hammer

46 or 28 forwardly striking the anvil 22 and causing the peen 17 to work the sheet metal. When the valve is closed, the resilient spring 40 or 45 returns the hammer, its rearward movement being cushioned by the means intermediate the hammer and the closure 34 or 34". In Figure 1, the means is the rubber washer 52 and in Figure 5 the means takes the form of the vents 51 being spaced forwardly from the closure 34". As the hammer moves rearwardly its enlarged portion 48 closes the vents 51 and the air escape is eliminated, thus a pressure is built up behind the hammer and cushions the return movement of the hammer intermediate the hammer and the closure 34".

Having thus described my invention, I claim:

1. A sheet metal working tool comprising a tubular body having a head at its forward end carrying a movable metal working peen; a hammer slidable in said body toward and away from said head; an eye on the rear 'aeeaoes 4 end of said hammer; a closure adapted to communicate the body with a valved fluid pressure supply and closing the body at the end opposed to said head; a forwardly projecting reduced extension on said closure coaxial with the body and serving as an abutment; said closure being axially bored to define an elongated housing; a diametrically disposed pin extending through the bore adjacent the rear end; a tension spring secured at one end to the pin and normally confined to the housing and having its other end secured in said eye; and a rubber cushioning device disposed between the hammer and the abutment. 2. The invention as defined in claim 5, wherein the peen comprises a flat body shaped in an obtuse angle and having a pivot aperture in the body at the apex of the angle, one leg of the angle constituting an anvil and the other leg supporting a metal working lip disposed substantially in parallel offset relation to the anvil leg.

References Cited in the file of this patent UNITED STATES PATENTS 410,935 Schmidt Sept. 10, 1889 1,798,378 Kott Mar. 31, 1931 2,263,952 Mercorelli Nov. 25, 1941 2,483,626 Daku Oct. 4, 1949 2,490,254 Casazza Dec. 6, 1949 2,526,380 Mathews Oct. 17, 1950 2,534,525 Molloy Dec. 19, 1950 2,694,435 Lund Nov. 16, 1954 2,714,918 Hopkins Aug. 9, 1955