Welding apparatus
OwnerHelmut Hahninventor
Life of this patent
Estimating the term…
Abstract
A welding backup shoe apparatus that comprises a double-acting fluid cylinder having a piston rod extending from it. A first retainer shoe is attachable to the piston rod and a second retainer shoe is opposed to the first retainer shoe. A first backup shoe to be received by the first retainer shoe and at least two other backup shoes are received by the first retainer shoe and by the second retainer shoe. The backup shoe is arcuate externally to be a close fit within a pipe. A guide is attached to the first retainer shoe, slidably engaging the second retainer shoe to guide the movement of the retainer shoes relative to each other. A release device is attached to the cylinder to abut the first backup shoe; and cables attach the two other backup shoes to the cylinder.
Claims20
A welding backup shoe apparatus comprising:
- a double-acting fluid cylinder having a piston rod extending from it;
- a first retainer shoe attachable to the piston rod;
- a second retainer shoe opposed to the first retainer shoe;
- a first backup shoe to be received by the first retainer shoe;
- at least two other backup shoes to be received by the first retainer shoe and by the second retainer shoe;
- the backup shoe being arcuate externally to be a close fit within a pipe of a predetermined internal diameter;
- guide means attached to the first retainer shoe, slidably engaging the second retainer shoe to guide the movement of the retainer shoes relative to each other;
- release means attached to the cylinder to abut the first backup shoe;
- and
- cables to attach the at least two other backup shoes to the cylinder.
Dependencies are inferred from the claim text.