Drill spring tension limiting device for floating drilling vesse

Details Drill spring tension limiting device for floating drilling vesse Drill spring tension limiting device for floating drilling vesse

1975-12-08

1977-09-20

Spar, Robert J.

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

175 27, 188313, B66D 148

Patent

active

040492397

ABSTRACT:
An apparatus for limiting the tension to which a suspended member can be subjected is disclosed. The apparatus responds to excessive tensile stress by increasing in length at a rate to keep such stress from exceeding a predetermined level. The present invention includes a closed cylinder with a piston disposed therein. Connected to the piston is a piston rod which extends through an opening in one end of the cylinder. The cylinder and piston rod are adapted to connect with a suspended member and a hoisting means. A bypass conduit connects the cylinder chambers by extending from one side of the piston to the other. In the conduit, there is a flow control regulator which actuates when the pressure on one side of the piston reaches a predetermined level, corresponding to a proportional tensile stress, permitting fluid to flow through the conduit in such a volume that the pressure on that side of the piston is maintained at the predetermined level.

REFERENCES:
patent: 1855897 (1932-04-01), Taylor
patent: 2016755 (1935-10-01), Spracher
patent: 2763466 (1956-09-01), Lehr et al.
patent: 2838140 (1958-06-01), Rasmusson et al.
patent: 3117773 (1964-01-01), Wallens et al.
patent: 3158208 (1964-11-01), Kammerer
patent: 3511476 (1970-05-01), Horton

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