US2377458A - Electrode holder - Google Patents

Description

June s,1945.` A. R. www# 2,377,458

ELEGTRODE HOLDER Fild April 8, 1944 Zhwentor Patented June 5, 1945 yUNITED STATES PATENT OFFICE ELECTRODE HOLDER Alfred R. Stalkup, Coquille, Oreg. Application April s, 1944, serial No. 530,173

(c1. 21g-s) 3 Claims.

The present invention relates to improvements in electrode holders, and more particularly relates to that type of electrode holder employed in electric Welding where the work is in circuit with the holder.

With the advent of women in industry emphasis has been placed upon the extreme lightness of Welding tools and the adaptability to persons with small hands and these desiderata are prime objects of the present invention coupled with simplicity of construction, small cost of production and the limitation of the tool to small compass to take advantage of the small hands of women in introducing the tools through openings or into cramped quarters or angles.-

The improved tool also possesses new factors of safety and insulation and increased gripping ability upon the electrode.

It is a further object and purpose of the invention to provide an electrode holder in which the parts are few, readily assembled, readily adjusted and subject to quick manipulation in introducing and freeing the electrode.`

With the foregoing and other objects in view, the invention will be more fully described hereinafter, and will be more particularly pointed out in the claims appended hereto.

In the drawing, Whereinlike symbols refer to like or corresponding parts throughout the several Views,

Figure 1 is a longitudinal section taken through one form of electrode holder constructed in accordance with the present invention.

Figure 2 is a similar view taken on the line 2-2 of Figure 1.

Figure 3 is a transverse section taken on the line 3-3 of Figure 1.

Figure 4 is a longitudinal section taken through the collar member.

Figure 5 is a side view, with parts broken away and parts shown in section, of a form of pin or shaft employed.

Referring for the present to Figures 1 to 5 inclusive I5 designates the insulated handle of the electrode holder which may be corrugated if desired, this handle being in the form of a cylinder open at both ends.

Received into this cylinder and non-rotatively aflixedin the upper portion thereof is a metal collar I6 with its upper end substantially flush with the upper end of the tubular handle I5. The collar I6 may be held in the handle I5 in any suitable manner. As shown in Figure 4 diametrically opposite threaded openings are made in the wall of the collar I6 to receive set screws I8 which are introduced through countersunk openings I9 in the side Walls of the tubular handle I5.

The collar is traversed by an axial bore 20 through which slidably and rotatably nts the shank 2| kof a metal pin or shaft smooth walled throughout the major portion of its length but having a threaded terminal section at its free end portion adapted to mate with the threads of the internal socket 23 on the connector member 24.

As shown more particularly in Figure 5 the head 25 of the pin 2I extends above a transverse aperture 26 made all the way through the shank 2l from side to side. In the head 25 may be made a threaded socket 21 to receive a set screw 28 fitting through a countersunk performation in ther top wall 30 of an inverted cup shaped insulating cap, the depending flange of which is indicated at 3I. ,The flange 3| is of substantially the same diameter as the shell or handle I5 and ts down upon the upper edge of such handle I5 in the normal position of the partsl A coil spring 32 is wound in a suitable number of convolutions about the shank of the pin 2I with the upper end of the helix engaging the bottom of the collar I6 and the lower end of such helix contacting a washer 35 which reposes against a flange 34 on the upper end of the conical connector 24- AThe washer 35 is of a diameter to rather snugly fit within the cylindrical wall of the insulated handle I5 but capable of axial sliding movement therein. The flange 34 is preferably slightly short of this diameter to enable the peripheral edge of the washer 35 to have' a slight flexing movement when driven upwardly to relieve any air that may tend to be compressed within the handle I5, although the handle may have perforations to permit breathing of the space surrounding the helical spring 32,

Referring to Figures 3 and 4, the upper end of the collar I6 has produced therein a pair of diametrically opposed substantially parabolic recesses 36, one wall 31 of which is modified from the true parabolic curve in order to be less severe and more gradual.

As shown in Figure 2 the wall of the shell handle I5 at the upper end thereof is formed with a pair of similar recesses 38 registering with said parabolic recesses 3B of the collar I8.

The upper portions of the recesses 36 and 38 open upwardly. As shown more particularly in Figures 3 and 4 the upper end of the collar I6 has made therein a pair of diametrically opposed notches 39, preferably V-shaped in cross section with the apices directed downwardly and the divergent side walls opening upwardly through the upper edge of the collar I6; such pair of V- shaped notches 39 being disposed at 90 or right angles to the diametric line connecting the cen ters of the parabolic recesses 36.

In the operation of the device, with the parts shown in Figures l and 2, an electrode has an end introduced through the recesses 38 and 36 until the leading end of the electrode appears upon the other side of the handle. With the parts shown in Figure 2 this is comparatively easy on account of the registration of the recesses 36 and 36. In so introducing the electrode the same will be caused to pass through the transverse aperture 26 of the pin shank 2|. The pin 2| is now rotated relatively to the handle l5. For instance the handle |'5 may be held stationary while the connector 24 is rotated which will carry the pin 2| around and also the insulating cap axially outward causing the head 25, and With it the insulating cap 30, to move away from the collar I6 and from the handle l5. The quarter turn will cause the electrode end portions to arrive at the pair of notches 39, which notches are also repeated at 40 in the upper end of the handle |5. When the end portions of the electrode arrive in registry with the V-shaped notches 39 they will snap into the same due to the potential energy of the coil spring 32. Such coil spring will be compressed as the pin 2| is cammed upwardly incident to the relative rotation of the parts just described and the riding of the electrode ends on the inclined walls 31. The energy of the coil spring will become kinetic when the electrode ends arrive above the notches 33. Con'- Y sequently this coil spring 32 will exert strong and continued force to draw the head 26 down upon the electrode and to force upwardly the collar |6 upon such electrode ends, thus clamping the electrode securely in place. The electrode may be removed by endwise pressure downwardly upon the handle l5 while the connector 2l is held immovably against a table or rigid surface. When an electrode is to be subsequently replaced in the holder, the pin 2|, through the connector 24, may be rotated to bring the transverse aperture 26 into alignment with the recesses 36 and 38.

When the electrode is removed, the coil spring 22 expands and closes the insulating cap ange 3| upon the handle I5 thus enclosing all of the conductor parts and preventing possible arcing and burning or other injury to the person or to the materials,

Such holder will retain without adjustment any rod electrode from the smallest to the largest made, depending upon the size of the holder and the sizeof the hole 26 through the shaft 2| and the sizes of the parabolic recesses 36 and 3B. The base connector 24 is preferably tapered. Over this tapered surface the lead ts and is held by friction.

What is claimed is:

1. An electrode holder comprising an insulated handle of tubular form open at both ends having diametrically opposed recesses and diametrically opposed notches angularly offset from the recesses, a tubular metallic collar secured in the outer portion only of said insulated handle and having recesses and notches registering with the recesses and notches of said insulated handle, a shank slidingly and rotatably tted through said collar and having a transverse aperture to receive the electrode, a connector member connected to said shank, spring means in said insulated handle constructed and arranged to yieldingly force said collar and connector away from one another, a head on said shank outwardly of the transverse aperture for closing against the outer end of said collar, and an insulated cap on said head having an inwardly projecting flange for closing against the outer end of said insulated handle.

2. An electrode holder as claimed in claim 1 characterized by the fact that the spring means is a coil spring Wound about said shank in a chamber conned within said tubular insulated handle in that part unoccupied by said collar, and means for closing the end of said chamber opposite to said collar.

3. An electrode holder according to claim 1 wherein a chamber is formed for the spring means within that portion of the insulated handle unoccupied by said collar, and wherein the connector member forms a shoulder with said shank, and a flexible washer seated on said shoulder and fitting in the end portion of the chamber opposite the collar, said washer fitting tightly against the wall of the chamber, said shouldered portion of the connector member being of less diameter than that of the Washer and less than the internal diameter of the chamber wall.

ALFRED R. STALKUP.

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