US2427894A

US2427894A - Electrode holder

Info

Publication number: US2427894A
Application number: US590879A
Authority: US
Inventors: Charles E Benner
Original assignee: MOTT STEEL PRODUCTS Co
Current assignee: MOTT STEEL PRODUCTS Co
Priority date: 1945-04-28
Filing date: 1945-04-28
Publication date: 1947-09-23
Anticipated expiration: 1964-09-23

Description

Sept.4 23, 1947.v c. E. BENNER ELECTRODE HOLDER Filed April 28, 1945 Patented Sept. 23, 194i? VuN-rrlez-pf STATES Pff Application April v28', 1945;' Serial No: 590,879 'L 7 Claims.

clamping the welding rodsecurely thereto.

While. various .types of -Yelectrode holders have been,,manufacturedsheretofore; it is believed thatv thepresentholder containsunique and patentable features- The holder embodies :a vhandle portion-oi?y insulating tubular construction having a cable terminal supported therein byscreWs which project/through Vthewally of the handle. 'Ihe terminal hasa forwardly; extendedY tubular portion r containingy aninternal and external thread, irl the..formeroffwhieh a rod is threaded which projectsbeyond the-.tubular extension.- The exterior.. threads on. the tubular extension engage threads in acOnducting head having a hollow interior into which `the stemY extends andv moves longitudinally. relative theretoI whenV .-the head -is Y screwedupon the terminal extension. An angularly disposed aperture extends lthrough the head for. the reception ofthe welding,.rod which isV Accordingly, the main objects ofthe-invention are;v to provide an electrode holder vhaving a truncated, pyramidal conducting head ontwo opposite sides of which insulating plates are secured to project therebeyond; to provide a terminal for afhollow` insulating handle of an electrode holder. with a tubular'projectionV having interior and exterior threads for supporting a clamping rod on the internal, threads and for producing-the advancement of therod by the movement 'of the `thread on -the exterior surface ofth'erextensioninV a. thread jwithin `the conductinghead of theV holder; tosupport a terminal within a hollow insulating'handle of an electrode by screws whichY extend' through the wall thereof and which are insulatedby a `flexible band which is snapped' within -a groove' inwhich the lheads of the screws are nested; to provide an electrode holder with an insulating handle -for supporting a conducting headin vwhich the welding rod is clamped and which is protected by-foppositely disposed insulating plates which project beyond" the edges of the head; and in"general-'to-providean electrode holder -whioh- 'is` simple inL construction, lpositive in'foperati'on,v Y' andA economical of manufacture."

Other objects and'ffeaturesfof novelty"of"the" A pair of insulatingf 2li irlven'tionwill-rv bei specifically`-` pointedf out 'Y or will becomef'` apparent;4 when referring; for4V a'` better understanding of Vther-inverltionf, to the followingdescription takenlinconjunctioh with' the accom; panying drawing, wherein- Figure l-is a view'in elevationof an electrode holder yembodyingfeatures J of thisinvention';

Fig; 2 isa-sectional view-of thestructure-illustratedin Fig. 1tal' en"on` the ffline Z-*L-Zthereofl Figa is a1 sectional viewfof 'the structure illustrated `in Fig; 2, taken 'on"fth'e"lin`e 3`3`thereoff, and

Fig. 4 is a sectional view of the structure illus# trated in Fig; 2,A taken vonthe line 4--4 thereof.A

The electrode holdercomprises a'tubular handle` I0 made' of insulatingamaterial having `cir-` cumferential notches`-`r I I therein to provide la' secure gripvfor-l 4the operatorv grasping vthe` handle;r Al pair ofoppositelyfdisposed notches I2 is'prof vided near the' front edge ofthe handle'for thepurpose of receivingfpa'pairofv insulatingplates" which, when secured vtogetheig'are llocked kon the handle-tor form ashield A cable terminal- I3vis provided ywith a hollow; interior I4 in AwhichY the end I5 Ofa cable I6 projects and vis-seeuredin position by'a pair of set.screws-l`|. Ascrew IIL-Which' secures the; terminaly inposition in the handle I0, has its headf covered'frby a resilient bandY I9 which projects within al circumferential'groove 2l in 'which the` headis nested.`

The-terminal I3-v has a tubular extension 22 at itsforward endfcontaining athread 23^on its innersurface and I-a thread-24l on its outer surface. A :clamping -rod 25 has athreadedlend 26-which is screwed-finto the interior of the extension 22 of theterminal to-be disposedin fixedrelation therewith.

Aicondu'cting head.2'l -contains a central aperture 28 vinwhich the rod-25'projects1and anenlarged aperture -29 ycontaining a thread 3| which 'l registers with the thread 24 onthe exterior surface of the extension 22 of the'terrninal I3. An aperture 32-extends laterally through theA end of the vhead 2l and communicates with the aperture'28-frorny which a conical end 33 of the'rod* 25-isvadvancedto engage a weldingr electrode 34't andclamp it againstthe sides-of the aperture 32." It `will be notedfromliig.` 1 that the aperture 32 is provided .with flat' sides 35 'in angular relationJ to f each other oppositetothe conical end 33 so as -to'produ'cerlin'e contact between'the weld'- l ing rod 34 and eachof'the flat 'sides 35 toprovide` good conducting contact therebetweenl' This' I maintains l*the resistance'toA the "iioW'of `current" 3 therebetween to a minimum to prevent the undue heating of the head and rod.

The end of the head adjacent to the handle I is cylindrical in shape and provided with an outwardly directed flange 36 which extends substantially to the inner surface of the handle I0 as it moves in a cylindrical slot 31 formed between the terminal extension 22 and the inner surface of the handle. The sides 38 of the head 21 converge toward the forward end the same as the sides therebetween containing the aperture 32. The sides 38 of the head are covered by a pair of insulating plates 39 being secured in position by screws 4I. The plates 39 are made from a material which resists burning and project a substantial amount from the side edges to protect the uninsulated faces and end from contact with a metal plate or other object while in use or when placed thereon after use. When the electrode holder is to be initially employed, the resilient band I9, the screw I8 and the cap 21 are removed to permit the removal of the terminal I3 from the handle I0. The end I5 of the cable I6 is then inserted within the aperture I4 and is retained in xed relation thereby by tightening the set screws I1. Thereafter the terminal `I3 and cable are inserted into the handle I0 from the right-hand end thereof, as viewed in the figure. The screw I8 is inserted in the position as illustrated in Fig. 2 and the band I9 is applied thereover within the slot 2l in the outer surface of the handle. The cap 21 is screwed upon the threads 24 of the terminal extension 22 and a welding rod 34 is inserted in the aperture 32 of the head. The relative rotation of the head 21 and handle I0 advances the conical end 33 of the rod 25 within the aperture 28 until it engages the rod 34 and forces it into good conducting contact with the flat faces 35 of the aperture 32 which completes an electric circuit from the cable I to the end of the welding electrode.

When the welding electrode has been consumed, it is only necessary to rotate the head and handle I0 relative to each other a slight amount to release the rod 34 and, after another rod has been inserted in the aperture 32, the relative rotation of the head and handle in the opposite direction clamps the rod in position within the aperture 32. It will be noted that the sides 38 of the head 21 of the holder, as well as the sides 42 disposed therebetween, taper from the rear or threaded end to the opposite or front end containing the aperture 32. This provides sufficient material to properly conduct the current to the welding electrode and produces a trim appearance to the head when insulated by the plates 39. The body of the cable terminal I3 is provided with a circumferential groove 43 and the bearing rings 44 are slotted at spaced points so as to permit air to pass from one to the other end of the handle which aids in cooling the terminal and other metal parts contained therein.

What is claimed is:

l. An electrode holder embodying a tubular handle, a cable terminal within the handle to Whicha cable is secured, a screW extending through the wall of the handle into the terminal for retaining it in fixed relation within the handle, a resilient band supported by said handle over the screw for insulating the screw head, a tubular extension projecting forwardly from the cable terminal having a thread on its interior and exterior surface, a rod threaded within the tubular extension, and a .cap threaded onto the threads of the outer surface of the extension Containing a hollow interior into which the rod extends, said cap having sides which converge from the threaded to the opposite ends.

2. An electrode holder embodying a tubular handle, a cable terminal within the handle to which a cable is secured, a screw extending through the wall of the handle into the terminal for retaining it in fixed relation within the handle, a resilient band supported by said handle over the screw for insulating the screw head, a tubular extension projecting forwardly from the cable terminal having a thread on its interior and exterior surface, a rod threaded within the tubular extension, a cap threaded onto the threads of the outer surface of the extension containing a hollow interior into which the rod extends, said cap having sides which converge from the threaded to the opposite ends, and a pair of insulating plates secured to opposite sides of the head which project beyond the sides and ends, said head containing an aperture through the uninsulated sides communicating with the oentral aperture in which the rod threaded in the cable terminal extends.

3. In a welding electrode holder, a cable terminal having a hollow threaded extension, an insulating handle for encompassing said terminal, a screw extending through the handle for securing the terminal thereto, said handle containing a slot through which the screw extends, a resilient band of insulating material secured to said slot for insulating the head of the screw, a cap threaded on the terminal extension, a. rod threaded in the aperture in the terminal extension to extend therefrom in fixed relation thereto, said cap having a hollow interior for receiving said rod, a laterally disposed aperture communicating with said first aperture into which said rod is projectable for clamping the electrode in position in said last aperture, and a pair of insulating plates secured to the sides of said cap to extend beyond the sides through which said last aperture extends.

4. In a welding electrode holder, a cable terminal having a hollow threaded extension, an insulating handle for encompassing said terminal, a screw extending through the handle for securing the terminal thereto, a rod threaded in the aperture in the terminal extension to extend therefrom in fixed relation thereto, a cap threaded on said terminal extension having a hollow interior for receiving said rod, a laterally disposed aperture communicating with said first aperture into which said rod is projectable for clamping the electrode in position in said last aperture, and a pair of insulating plates secured to the sides of said cap to extend beyond the sides through which said last aperture extends.

5. In a welding electrode holder, an insulating handle, a cable terminal in said handle having a thread, a conducting cap threaded on said handle having means for supporting an electrode, and a pair of insulating elements secured to opposite sides of said cap leaving the portion therebetween uninsulated but protected by said elements which extend beyond the exposed surfaces thereof.

6. A conducting cap having four converging sides, and a pair of insulating plates of an area greater than said sides secured to opposite sides of said cap to extend therebeyond to protect the uninsulated sides disposed therebetween.

7, A cap for an electrode holder made of conductive material and being of truncated pyramidal section having four sides sloping toward REFERENCES CITED The following references are of record in the le of this patent:

Number Number 6 UNITED STATES PATENTS Name Date Bourque May 14, 1940 Churchward Feb. 18, 1941. Carbis Mar, 24, 1942 Stafford Oct. 5, 1943 Bernard Dec. 5, 1944 FOREIGN PATENTS Country Date France f May 30, 1932