# US 5,705,782 A · Internal coil spot welding device

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- Number: US 5,705,782 A
- Document ID: US5705782A
- Status: Granted
- Kind: A
- Application number: 08/723,672
- Filed: 1996-09-30
- Granted: 1998-01-06
- Earliest claimed: 1996-09-30
- Inventors: David Gerback
- Web page: https://patentgrep.com/patent/US5705782A

## CPC

- B23K 11/11: Spot welding
- B23K 2101/18: Sheet panels
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM

## Abstract

A spot welding device to secure the inner end of a coil of steel to itself to prevent uncoiling. The welding device is carried on an articulated support arm assembly that allows for positioning the welder within the coil on a gimble axis mount for proper access to the entire inner coil surface. Welding tips are selectively held against the welding surface by an extensible guide and engagement assembly.

## Claims

### Claim 1

A coil welding tool to be positioned within a coil of steel or the like for securing the coil's end to the coil comprises; a power transformer and a switch assembly, an extension arm extending from said power transformer, welding tip assemblies in said extension arm and said welding tips interconnected with said power transformer and a source of power, a tool support extending from said welding tool to a remote attachment point, means for rotating said welding tool on its longitudinal axis in relation to said tool support and means for selective engagement of said welding tip assemblies within said coil.

### Claim 2 (depends on 1)

The coil welding tool of claim 1 wherein said extension arm is tubular and said welding tips are resiliently positioned within said arm.

### Claim 3 (depends on 1)

The coil welding tool of claim 1 wherein said welding tips are interconnected to said power transformer by pairs of power cables between cable terminals on said power transformer and cable lugs on said welding tips.

### Claim 4 (depends on 1)

The coil welding tool of claim 1 wherein said tool support comprises a contoured support bracket.

### Claim 5 (depends on 1)

The coil welding tool of claim 1 wherein said means for rotating said welding tool on its longitudinal axis comprises; an outer annular support ring and a movable inner support ring, said inner support ring secured to said tool.

### Claim 6 (depends on 5)

The coil welding tool of claim 5 wherein said outer annular support ring has bearing means interconnecting said inner support ring.

### Claim 7 (depends on 1)

The coil welding tool of claim 1 wherein said means for selectively engaging said welding tip assemblies comprises; a cylinder and piston assembly secured to said extension arm opposite said welding tip assemblies, a piston rod extending from said piston and cylinder assembly, a coil engagement bearing assembly on said piston arm, and a source of fluid pressure connected to said cylinder and piston assembly.