Multi-stage hydraulic stretcher for elongated fasteners

Details Multi-stage hydraulic stretcher for elongated fasteners Multi-stage hydraulic stretcher for elongated fasteners

1976-10-26

1978-02-21

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Pipe or rod jack

Tie rod tensioner

E21B 1900

Patent

active

040748901

ABSTRACT:
Hydraulic device for exerting a pre-stressing traction on bolts or pins comprises three stages, with each stage comprising a piston within a chamber. The thickness of the skirts of the piston increases from stage to stage in proportion to the pressure to which the piston of that stage is subjected during a stretching operation.

REFERENCES:
patent: 3279755 (1966-10-01), Notenboom et al.
patent: 3830536 (1974-08-01), Frisch et al.

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