US2599613A

US2599613A - Welding resistance

Info

Publication number: US2599613A
Application number: US180828A
Authority: US
Inventors: Robert J Cottingham
Original assignee: CLAYTON ORNER
Current assignee: CLAYTON ORNER
Priority date: 1950-08-22
Filing date: 1950-08-22
Publication date: 1952-06-10
Anticipated expiration: 1969-06-10

Description

0 ee w 1 WV v yv v W599; iki: 9QOWO QW O d June 1952 R. J. COTTINGHAM 2,599,513

WELDING RESISTANCE Filed Aug. 22, 1950 2 SHEETS-SHEET 2 II 'IIII'IIIA II IIIII Milli)!!!" Will-I III m IN V EN TOR.

Rosam- .\.CQTT|NGHAM AT TOD. N EYS Patented June 10, 1952 Robert J-. Cottingham, Huntington,

signer to Clayton Orner,

W. Va., as- Huntington, W. Va.

Application August 22, 1950, Serial No. 180,828 2 Claims. (01. 20148) This invention relatesvto electrical resistance units. and more particularly to resistance units e e i w ldi r i road in mine s id rail bonds being necessary in order that the track may carry the full current of the ground circuit for the mine locomotives.

A main object of the invention is to provide a novel and improved welding resistance unit which is very simple in construction, which is easy to transport, which is eflicient in performance, and which is easy to take apart for repairs or other required servicing.

A further object of the invention is to provide an improved r sistance unit for welding rail bonds for mine railways, said resistance unit being rugged in construction, being relatively inexpensive to manufacture, and involving relatively few parts, and beinge'asy to move'along a rail.

Further objects and advantages of the invention will become apparent from the following e r pt a d "cl ims. an fr m th was panying drawings, wherein:

Figure 1 is a side elevational view, partly broken away, of an improved electrical resistance unit constructed in accordance 'withthe present invention;

Figure 2 is an end elevational view, partly broken away, of the resistance unit of Figure 1, said view being taken at the right end of the unit, as viewed in Figure 1;

Figure 3 is an end elevational view, partly broken away, of the left end of the resistance unit of Figure 1;

Figure 4 is an enlarged cross-sectional detail view taken on line 4-4 of Figure 2;

Figure5 is an enlarged, fragmentary topplan detail view of the connector members shown in cross-sectional view in Figure 4, and the portions of the resistance elements secured thereto;

Figured is an enlarged cross-sectional detail view taken on line 66 of Figure 2;

Figure 7 is a side view of the terminalmember shown in cross-section in Figure 6, showing the end portion of the resistance coil element secured thereto;

Figure 8 is an enlarged front elevational detail view of one of the coil end connector members employed in a modified form of resistance unit according to this invention;

Figure 9 is a crossvsectional detail view taken on line 99 .of Figure 8, showing the end portions of the associated resistance elements secured to the connector member.

Referring to the drawings, the resistance unit is designated generally at H and comprises a pair of longitudinal side frame elements 12;[2 arranged in spaced parallel relationship and connected at their ends by respective cross members l3 and I4, and at their intermediate por tions by a transverse cross member [5. The longitudinal frame members [2 are inclined upf wardly at their respective ends, as shown 1 in Figure 1, whereby said longitudinal frame members define skids for at times supporting the resistance unit for movement along the ground. Secured between the longitudinal frame members adjacent the respective ends of the resistance unit are the transverse shafts l6, I6, and rotatably mounted on the respective shafts are the respective flanged rollers I1, l'l, said rollers being maintained in centered relationship be: neath the resistance unit by respective spacer sleeves l8, [8 carried on each shaft on opposite sides of the roller I! mounted thereon; The spacer sleeves l8 maintain the rollers I! in lonf gitudinal alignment with respect to each other and maintain said rollers centered beneath the resistance unit.

As shown in Figures 1 and 3, the resistance unit may be supported on a rail [9 by engaging the flanged roller l1 thereon, whereby the unit may be readily moved along the rail I9.

Secured to the generally rectangular frame defined by the side members [2, I2 and the transverse members I3, I 4 and I5, are the longitudinally spaced, arched members 20, shown in Figure 1, defining a supporting framework on which is mounted the cover memberili The cover member 2| may be of any suitably perforated sheet metal, such as expanded metal or the like, providing ample ventilation for the interior of the unit and at the same time afl'orde ing mechanical protection therefor. Secured to the end members 28 are insulating boards 22, and secured within each of the arched members 28 intermediate of the unit is an insulating separator board 23.

Designated at 24 are the respective helically coiled resistance elements disposed in parallel, longitudinally extending, spaced relation inside the unit and passing through the separator board 23, as shown in Figure 1. The right terminal board 22 has secured thereto the respective end terminals,.shown at 25 and 26, connected to the terminal ends of the unit and carries also a plurality of connector members 21 whichcom nect intermediate ends of the resistance coils and support said ends on the end board. The ends of the resistance coils adjacent the left board 22 are connected by connector members 21, as shown in Figure 3. The end terminal 25 is formed with an apertured lug 28 adapted to receive the terminal plug 29 of the trolley lead conductor 30, said lead conductor being provided at its free end with a conductive hook 3| adapted to engage over a live conductor 32, as shown in Figure 2. The end terminal 26 is provided with a similar apertured lug 33 adapted to receive the terminal plug connected to the welding electrode.

Referring now to Figures 6 and '7, it will be seen that the end terminal 25 is formed with an outwardly facing cup portion 34 which i received in an opening 35 formed in the end board 22. The flanged portion 35 of the terminal 25 is secured to the end board 22 by a plurality of suitable fasteners 31. The resistance element 24 is rigidly secured to a disc member 38, as by brazing, welding, or the like, said disc element 38 being formed with a plurality of upstanding lugs 39 at its periphery which are received in recesses Ail formed in the cup portion 34. Designated at 4| is a bolt which extends through the bottom wall of the cup portion 3 2-, and which is threaded into the central portion of the disc member 38, the head of the bolt being received inside said cup portion. The disc member 38 is thereby detachably secured to the terminal member 25, and may be disconnected therefrom by unfastening the bolt member 4|. As shown in Figures 6 and '7, the apertured lug 28 comprise a relatively long sleeve element adapted to receive the shank of a terminal plug. Designated at 22 is an insulating cover plate secured over the connectors 2'! to each end board 22, the cover plate 42 at the right end of the unit, as viewed in Figure 1, being suitably apertured to receive the ends of the lugs 28 and 33.

Certain of the connector members 21 are provided with similar apertured lugs, shown at 4 3, and the cover plates 42 are suitably apertured to receive the outer end portions of said lugs 44.

The terminal member 25 is substantially identical in construction to the terminal member 25.

Referring now to Figures 4, 8 and 9, it will be seen that the connector members 21 each comprises a plate member G formed with the spaced, outwardly facing

cup portions

46, 46. The ends of the resistance elements 2 5 have secured thereto the disc members 38 which ar bolted to the bottom walls of the cup portions 46 by bolts 4| in the same manner as described above in connection with Figures 6 and 7. The disc members 33 have the lugs 39 which lockingly engage in recesses 49 in the cup portions 26. The heads of the bolts 5| are housed inside the cup portions 46. The connector members 2? are fastened to the end boards 22 at their intermediate portions by suitable fasteners ll. As shown in Figures 8 and 9, the plate members 45 are formed at their intermediate portions with countersunk openings Q8 adapted to receive the fasteners ll.

Secured beneath the top portions of the arched members 29 at each end of the resistance unit are the U-shaped bars 22, the'bight portions of said bars projecting longitudinally outwardly at each end of the unit and having secured thereon the helically coiled handle springs 58.

As shown in Figure 1, the upper portions of the separator members 23 are braced by a longitudinally extending, threaded stud 5| which passes through the upper portions of the separator 23 and which is rigidly secured to the respective separator members 23 by the

nuts

52, 52 on opposite sides of the respective separator members 23 and the washers 53 disposed between the respective nuts 52 and the surfaces of the separator members 23.

As above explained, the trolley wire is plugged into the apertured terminal sleeve 28 and the welding wire plugged into the apertured terminal sleeve 33 when minimum weldin current is desired. When greater welding currents are desired, the welding wire may be plugged into the intermediate terminal sleeve members 44.

The special design of the terminal brackets and coil end connectors, described above, allow the fastening bolts 4| to be covered by the insulating cover panels 32. The cover panels 42 are secured to the end boards 22 in any suitable manner. The resistance coils may be easily removed for repair by removing the insulating end panels A2 and unfastening the bolts 4|. The coils may then be removed from the unit without dismantling the entire frame of said unit. The terminal brackets and connector members are preferably made of bronze or other similar metal of high conductivity having high resistance to corrosion.

- Modified forms of connector members may be employed, as shown in Figures 8 and 9, wherein the connector members are flat instead of having the cup portions shown in Figure 4, in which case the insulating end covers 42 are omitted and the coil end discs 38 are received in the openings formed in the end boards 22. The connector members 2'! are formed with the openings 48 through which the fasteners ll may pass for securing the connector members to the end boards.

While a specific embodiment of a resistance unit for mine railway bond welding has been disclosed in the foregoing description, it will be understood that various modifications within the spirit of the invention may occur to those skilled in the art. Therefore, it is intended that no limitations be placed on the invention other than as defined by the scope of the appended claims.

What is claimed is:

1. A welding resistance unit comprising a frame, insulating end boards on said frame, a plurality of longitudinally extending resistance coils in said frame, terminal brackets for connecting the terminal ends of the coils to the end boards, connector members for connecting the intermediate ends of the resistance coils and securing them to the end boards, said end boards being formed with respective openings, said brackets and said connector members being formed with cup portions received in said openings, said cup portions facing outwardly, respective disc members secured to the ends of the coils and lockingly engaging said cup portions, means detachably securing said disc members to said cup portions, end panels of insulating material secured to the end boards in overlying relationship to the terminal brackets and connector members, a plurality of transverse shafts carried by the bottom of the frame, and respective flange rollers mounted centrally of said shaft.

2. A welding resistance unit comprising a frame, insulating end boards on said frame, a plurality of resistance coils in said frame extending longitudinally substantially the full length thereof, means secured to the frame for supporting the intermediate portions of the resistance coils, terminal brackets for connecting the terminal ends of the coils to the end boards,

connector members for connecting the intermediate ends of the resistance coils and securing them to the end boards, said brackets and connector members being formed with outwardly facing cup portions, said end boards being formed with respective openings receiving said cup portions, respective disc members secured to the ends of the coils and engaging said cup portions, said cup portions being formed with opposing recesses, lugs on the disc members engaged in said recesses, respective bolts extending through the cup portions and threadedly engaging the disc members, end panels of insulating material secured to the end boards in overlying relation to the terminal brackets and connector members, apertured lugs on said terminal brackets and on certain of the con- ROBERT J. COTTINGHAM.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,138,659 Huenerfauth May 11, 1915 1,478,435 I-Iim Dec. 25, 1923 2,438,850 Fot Mar. 30, 1948