Hydraulic tensioning device

Details Hydraulic tensioning device Hydraulic tensioning device

1994-01-21

1996-06-18

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Pipe or rod jack

Tie rod tensioner

E21B 1900

Patent

active

055270158

ABSTRACT:
A hydraulic nut 16 (FIG. 2) or (bolt 70 FIG. 5) has a body 17 including an annular recess 20 to define, with an annular piston body 28, a chamber 29. The piston terminates in annular metal webs 30, 31 which define seals capable of withstanding high temperatures for long periods between chamber pressurizations. A locking ring 32 carried by the piston abuts the end face 35 of nut body wall portion 24 to support a bolt tension induced by hydraulic pressure in the chamber when such pressure is reduced. The end 33 of the locking ring is recessed, as is the corresponding face portion 35 of the nut body, to ensure that if the body wall portion 24 is deflected outwardly by chamber pressure it is able to relax and slide inwardly over the ring surface, despite the axial load being transmitted when the chamber pressure is reduced.

REFERENCES:
patent: 3230799 (1966-01-01), Maciulaitis
patent: 3321182 (1967-05-01), Elenburg
patent: 4052652 (1977-10-01), Simnovec et al.

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