US1971133A

US1971133A - Welding-electrode holder

Info

Publication number: US1971133A
Application number: US674180A
Authority: US
Inventors: Davidson James
Original assignee: Individual
Current assignee: Individual
Priority date: 1933-06-03
Filing date: 1933-06-03
Publication date: 1934-08-21
Anticipated expiration: 1951-08-21

Description

Filed June 5, 1935 //v VEN r02 flames 041/1050 Arr-calve- Y5 Patented Aug. 21, 1934 UNITED STATES PATEN'I OFFICE:

1 Claim.

This invention relates to welding apparatus and, more particularly, to electric arc-welding.

It is one of the objects of the invention to provide a welding-electrode holder that will be more convenient to use, safer, and more efficient than the electrode holders that have been heretofore used for hand welding.

A further object of the invention is to provide a holder that will be capable of permitting a greater portion of the electrode to be. used up than is possible with holders now in use, thereby effecting a saving in the cost of electrodes.

A further object of the invention is to provide a holder that will be capable of use in places that would not be accessible to holders now in use and that is so constructed that there will be no short-circuiting of the current when the holder accidentally comes in contact with the work.

A further object of the invention is to provide a holder that will be capable of use with electrodes of different diameters and that will be adjustable to compensate for any wear that occurs in its parts.

A further object of the invention is to provide a holder that may be easily taken apart and reassembled and the working parts of which will be protected from sparks and therefore remain in a clean condition.

Other objects of the invention and the features of novelty will be apparent from the following description, taken in connection with the accompanying drawing, of which Figure 1 is a longitudinal section of a'holder embodying my invention; and I Fig. 2 is a transverse section on the line 2-2 of Fig. 1.

Referring to the drawing, 10 indicates a tubular metallic stem having a head 11 welded or otherwise secured thereto. The head 11 has a tapering longitudinal bore 12 and a transverse opening 13, this opening being adapted to receive the weldelectrode or rod 14. The head 11 is covered by a cap 15 of insulating material, preferably a mica compound that will withstand the heat and sparks to which it is subjected.

The other end of the stem 10 is externally threaded, as indicated at 16, and arranged in the threaded opening 17 in the casting 18. The casting 18 is preferably of circular form with a flattened portion 19 on one side, as indicated in Fig. 2. The casting 18 has an axially extending arm 20 provided with a head 21 which acts as an abutment for one end of the spring 22. A lug 23 is arranged on thehead 21 and extends into the spring 22 so as to hold the latter in position. A

plunger rod 24 extends longitudinally through the stem 10 and the casting 18 and carries a pin 25 which is engaged by the upper end of the spring 22. The other end of the plunger rod 24 has welded or otherwise secured thereto a head 26, of copper or other suitable material, which is adapted to press against the welding electrode 14 and clamp the latter in the opening 13.

A tubular handle 27 has oneend telescoped over the casting 18 and secured thereto by the screws 28. A trigger 29 is pivoted to the reinforcing web 30 of the arm 20, as indicated at 31, and projects through a slot 32, in the handle 27, so as to be operable from the exterior of the handle. The protruding portion of the trigger 29 is wrapped with tape or other insulating'material, as indicated at 33.

A cup-shaped insulator 34 encloses the member 18 and is secured thereon by the nut 35, and this nut also acts as a lock nut for the threaded connection between the stem 10 and the member 18 and insures tight engagement of the threads so as to make good electrical contact therebetween for transmitting the welding current from the member 18 to the stem 10. The insulator 34 surrounds the heads of the screws 28 and protects the latter so that, when the holder is laid on a metallic surface, there will be no opportunity for short-circuiting the current through the screws 28.

A flexible conductor 36 is arranged within the tubular handle 2'7 and has a terminal 37, which is secured to the member 18 by the screws 38, and a terminal 39 which is connected with a terminal 40 on a cable 41, by means of the bolt 42. The cable 41 represents the usual cable for supplying the welding current, and it will be noted that the connections between the cable 41 and the member 18 are within the handle 27 and effectively insulted thereby.

As illustrated in Fig. 1, the holder is ready for use and it will be noted that the pressure of the spring 22 will clamp the welding rod 14 into the position shown. The spring 22 will also allow the plunger to clamp welding rods of different diameters. The copper tip 26 will be subjected to a certain amount of wear, in service, and to compensate for this wear, it is desirable to have the stem 10 adjustable in the member 18, and such adjustment may be made by loosening the lock nut 35 and turning the stem to move it in";- or out, as may be necessary, and then tightening the nut 35. A further adjustment is provided by means of the additional opening 43 in the plunger 24 to receive the pin 25. The stem 10 is wrapped with tape 44 or otherwise covered by insulation material.

From the foregoing description, it will be apparent that I have provided a form of weldingelectrode holder that will be safe in use, because of the insulation of all external metal surfaces that might be liable to contact with the work, and that will be convenient to use and in which the working parts are thoroughly housed and protected from flying sparks, so that these working parts will remain clean and be capable of operating efliciently over long periods. The manner of mounting and securing the welding-electrode insures convenience in operation, and also renders the device capable of use in relatively inaccessible places.

All of the working parts of the holder are readily accessible for adjustment and repair when necessary, throughhaving the tubular handle 27 removable by simply loosening the screws 28.

While I have illustrated and described what I now consider to be the preferred embodiment of my invention, it will be apparent that various changes in the details of construction that have been illustrated and described may be made without departing from the spirit of the invention as defined in the appended claim.

Having thus described my invention, I claim:

A welding-electrode holder comprising a tubular stem having a transverse opening in one end to receive the welding electrode and having its other end threaded, a circular member having an opening in which the threaded end of said stem is adjustably secured, said member having an integral arm projecting therefrom on the side opposite from said stem, a tubular handle of insulating material surrounding said member and said arm and secured to said member by screws, a spring-pressed plunger extending through said stem and engageable with said electrode to secure the latter in said transverse opening, a trigger operatively connected with said plunger and projecting laterally through said handle, a cupshaped insulator abuttingagainst said member and having a flange surrounding but spaced from the adjacent end of said handle, a nut on said stem for securing said cup-shaped insulator in position and also for locking said stem in adjust-- ment, and means for securing an electrical conductor to said arm within said handle.

JAMIES DAVIDSON.