US2655825A

US2655825A - Automatic sheet metal reforming hammer

Info

Publication number: US2655825A
Application number: US258959A
Authority: US
Inventors: Gendron Joseph
Original assignee: Individual
Current assignee: Individual
Priority date: 1951-11-29
Filing date: 1951-11-29
Publication date: 1953-10-20
Anticipated expiration: 1970-10-20

Description

Oct. 20, 1953 J. GENDRON 2,655,825

AUTOMATIC SHEET METAL REFORMING HAMMER Filed NOV. 29, 1951 Joseph Gendron I N V EN TOR.

Patented Oct. 20, 1953 UNITED STATES PATENT OFFICE AUTOMATIC SHEET METAL REFORMING HAMMER 1 Claim. 1

The present invention relates to new and useful improvements in tools for removing dents from sheet metal and more particularly to a power operated picking hammer for use with automobile body and fender repair work.

An important object of the invention is to provide a tool of this character adapted for use in places normally inaccessible to hand operated tools and wherein the hammer is rapidly actuated to quickly complete the job.

Another object is to provide a device of this character of simple and practical construction, which is eflicient and reliable in operation, relatively inexpensive to manufacture, and otherwise Well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a side elevational view;

Figure 2 is a longitudinal sectional view; and,

Figure 3 is an enlarged transverse sectional view taken on a line 3-3 of Figure 2.

Referring now to the drawing in detail, wherein for the purpose of illustration I have disclosed a preferred embodiment of my invention, the numeral 5 designates a barrel in the center of which a hollow plunger 6 is slidable. A rod 1 is welded or otherwise suitably fixed at its central portion to plunger 6 with front and rear guide plugs 8 and 9 pressed in or otherwise suitably fixed in the front and rear ends respectively of the barrel. Front and rear opposing coil springs l and I l are positioned in the barrel, front spring I0 being held between the plunger 6 and front fixed plug 8 and rear spring ll being held between plunger 6 and rear fixed plug 9. The rod 1 extends through rear plug 9 to project rearwardly beyond the rear end of the barrel into the front end of a pulsating type pneumatic tool 12 of a conventional type for actuation by the reciprocating piston 93 of the tool. The tool I2 is attached to the rear end of barrel 5.

A head I 4 is constructed of a pair of spaced apart side plates l and I6 with a rear collar ii welded between th rear edges of the plates and is threaded on the front end of the barrel. A front collar 18 is welded between the front edges of the plates substantially at right angles to rear collar ll.

A hollow guide plug I 9 is threaded in the lower end of front collar 18 and in which the front end of a reciprocable pick hammer 20 is slidable. The

hammer is held in a retracted position by a coil spring 2| held between plug l9 and a flange 22 adjacent the rear end of the hammer. The rear end 23 of the hammer is received in a recess 24 at the front end of a substantially bell crank arm 25 which is pivoted adjacent its central portion on a transverse pin 26 supported by the plates 15 and I6 and with the rear end 21 of the bell crank arm positioned in the path of forward movement of the front end of rod 1.

In the operation of the device rod l is pushed forwardly by the piston I3 of the pneumatic tool causing the front end of the rod to strike the rear end of bell crank arm 25 to rock the arm and project hammer 20. During forward movement of rod 1 the plunger 6 carried by the rod compresses front spring ID and upon completion of the forward stroke of the rod spring I!) returns the rod rearwardly and spring 2! retracts hammer 20 and such action of both springs I 0 and 2| is opposed by rear spring II which is compressed by the rearward movement of plunger 6 and tends to check the return movement of the rod and also tends to hold the rod engaged with arm 25 and results in a rapid reciprocativ movement of the rod.

Accordingly, by placing the front end of the hammer against a dent in a fender or other sheet metal work the dent will be rapidly hammered to smooth the same.

Although the barrel 5 is shown attached to a pneumatically operated tool it will be apparent that the same may also b used with electrically or mechanically operated tools as well.

In View of the foregoing description taken in conjunction with the accompanying drawing it is believed that a clear understanding of the device will be quite apparent to those skilled in this art. A more detailed description is accordingly deemed unnecessary.

It is to be understood, however, that even though there is herein shown and described a preferred embodiment of the invention, the same is susceptible to certain changes fully comprehended by the spirit of the invention as herein described and the scope of the appended claim.

Having thus described the invention, what is claimed as new is:

A sheet metal picking hammer comprising a barrel, a reciprocable rod in the barrel, a head at the front end of the barrel, a guide in the head, an elongated hammer slidably mounted in the guide and positioned substantially at right angles to the rod, spring means retracting the hammer, a substantially bell-crank arm pivoted to the head and having one end engaging the rear end of the hammer and having its other end in the path of movement of the rod, front and rear springs in the barrel, an abutment at the front end of the barrel for the front spring, an abutment at the rear end of the barrel for the rear spring, means fixed to the rod for movement therewith and separating said front and rear springs to compress the front spring upon a forward movement of the rod amif to compress the rear spring upon a rearward movement of the rod, said front and rear springs opposing each other to tend to reciprocate the rod, and said rear spring maintaining the forwardrend-efl the rocL- in engagement with said bell-crank arm, and means connected to the rear end of the rod to actuate the same.

JOSEPH GENDRON.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,151,361 Hi1nter Aug. 24, 1915 2,004,459 Boehnke June 11, 1935 2,175,946 Margolis Oct. 10, 1939 2,319,478 Rybak May 18, 1943