US2490254A - Pecking hammer - Google Patents

Description

Dec. 6, 1949 -R. E. cAsAzzA 2,490,254

PECKING HAMMER Filed NOV. 17. 1947 f /7 mlm- F/G. Z

NVENTOR Patented Dec. 6, 1949 UNITED STATES PATENT GFFICE PECKING HAMMER Roy E. Casazza., Oakland, Calif.

Application November 17, 1947, Serial No. 786,417

2 Claims.

This invention relates to improvements in automobile body straightening devices and particularly to devices for straightening or lifting small dents or ridges which cannot be straightened by conventional straightening tools.

For straightening, door panels, fenders and the like, various types of rollers and hammers are used. These types of tools are very effective in straightening large dents which are free of ridges or wrinkles but do not straighten tiny dents, ridges or wrinkles, which are ground down after the straightening operation has been completed to the extent of which the specic tools are capable. In grinding these ridges, wrinkles and tiny dents, the metal at those points is ground through or almost through, requiring patching, or a previous peining job must -be carried out before grinding, and which is slow and laborious and not too exacting because in such jobs the Work is being carried out rather blindly, with an anvil on one side and the pening carried out on the other.

With my invention tiny wrinkles and dents are easily straightened because the dent, ridge or wrinkle is under direct observation during the operation. The tool can be located exactly for the tiniest dent or sharpest ridge, and due to constant observation the tool can be progressed along the ridge to straighten the ridge completely. The tool is capable of operating under pressure or by tapping and is under constant control of the operator. It is made to span any part of the body, doors, or fenders of an automotive vehicle, and opens up suiciently to pass any obstructional part such as a door frame.

The objects and advantages of the invention are as follows:

First, to provide a pecking hammer for straighteningnarrow ridges and small denis in sheet metal parts.

Second, to provide a hammer as outlined in which the ridge or dent is constantly observable during the straightening operation.

Third, to provide a hammer as outlined which may be used to stroke a blow or to create a pressure for straightening dents and the like.

Fourth, to provide a hammer as outlined with sufficient gap to pass over and engage any area on an automotive fender, door or the like.

Fifth, to provide a hammer as outlined which opens sulliciently wide to pass obstructions such as door frames and the like.

Sixth, to provide a hammer as outlined with an anvil incorporating a sight and centering means.

Seventh, to provide a hammer as outlined which is simple in construction and operation and relatively light in weight. g

In describing the invention reference will be made to the accompanying drawings, in which:

Fig. 1 is a side elevation of the invention shown partly in section. v

Fig. 2 is an enlarged sectional elevatio through the hammer and anvil.

Fig. 3 is a section taken on line 3-3 of Fig. 1. The invention consists of a frame consisting of a section of tubing having a vertical portion II) which is bent at right angles at II continuing into a horizontal portion I2 which in turn continues through a return bend I3- terminating in a fork I4 into which is intermediately pivoted'a second section of tubing I5 as indicated at I6 leaving a handle portion I'I with the other end continuing substantially parallel to the straight section I2 when the tool is closed, and continuing in a dependent portion I8 to the end of which is aiiixed an anvil I9.

The portion I Il is bored as indicated at 20 for the piston 2I which terminates in a ball pein 22, and which constitutes the hammer, and this hammer is retracted by a tension spring 23 one end of which is attached to the hammer as indicated at 24 4and the other end anchored in the tube on a pin 25.

The anvil I9 has a sight opening 26 which functions as a locating and centering means for exactly locating the dent on the sheet metal/21 such as a fender or door of an automotive vehicle.

The gap between the sections I2 and I5 when the tool is closed as shown is sufficient to span any portion of an automotive vehicle such as a fender or door, and the span between the sections III-I8 and I3 is suiiicient to reach any portion of such parts.

A leaf spring 28 (partly broken away because of the break in the frame) urges the tool to open.

The portion I2 is actually made in two parts, the part III, II, 29 and 30 being continuous, with the part l2, I3 and I4 welded to the bend as indicated at 3|, and the part 30 is bent down and terminates in a connection-for a suitable manually controlled valve 32 which is connected to a suitable source of fluid under pressure through a conduit 33.

In operation the lower portion with the valve drops down out of the way, The anvil is placed over the dent which is sighted through the opening 26 and centered therein. The lower portion is then raised to bring the end 34 into contact with the metal 21, and the valve is then operated 3 to cause the hammer 22 to strike the dent under the pressure in the line 33.

In this case the valve is operated for each stroke, the valve being of the well known type in which depression of a button or lever 35 admits fluid and when released, the uid supply is shut olf and the actuating fluid is released, the spring returning the hammer to its retracted position.

As will .be noted, :gripping-acrossrthe handle l1 and portion l4'c1oses the tool, or,the tool can be held close to the portion I8 by one hand while the other hand grips the portion l2 and operatesf the valve, or may be held by the valve.

I claim:

1. A pecking hammer comprising; Va first tubular member having a rightangle portion at one end and a return bend at the otherend`and sealed at its terminal end and terminating in a fork, and having a hammer including a piston slidable in said rightangle portion, and a `spring for re- *trac'ting v*said hammer, and-a fluid connection and-a Vvalve 'therefor 'jfor'controlli'ng iuid under vpressure to said `riglitangle portion for -operatl`ingsaid hammer; a second tubular-member ininto a return bend .projecting upwardly, at the other ,endfand terminating in a fork, said rst Jtubular'elementhaving a iiuid connection including a manually controlled valve intermediate the length of the intervening horizontal portion between the bent upward and return bend portions, and with said tubular element sealed off on the return bend side of said connection; a piston type hammer operative in said cylindrical bore, and a tension spring for normally retracting said hammer; a second tubular element having a hinged connectionin said forkfand extending rearwardly inside of said return bendto form a lever for gripping in connection with the terminal portion of said return bend, and terminating at the other end in a depending portion bent at right angles lwith-'its axis parallel to and rearwardly offset rel- -ative tothe bent upward portion and having a.

shoe projecting forwardly with a sight passage formed'inilinewithfsaid hammer, with said hammeLstriking a single blow and holding pressure each time the valve is 'manually actuated.

ROY E. .CASAZZA REFERENCES -CITED The iollowingreferences fare of :record .rin :the file of this patent:

yNumber Name Date 1,765,372 Groehn June 24, 1930 1,934,979 Hopkins 1 .-Nov. t14, 1933 1,982,667 Hopkins Dec. 4, r1934 -2,004,459 Boehnke .June 1l1, -1935 2,054,248 Eronen Sept. 15J 0936 v2,320,074 :Golnick -May25, 1943 Number .Country Date

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