Apparatus for compensating variations of distance

Details Apparatus for compensating variations of distance Apparatus for compensating variations of distance

1977-03-18

1978-10-24

Blix, Trygve M.

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

60413, 175 27, B66D 148

Patent

active

041218060

ABSTRACT:
Apparatus for compensating for variations in the distance between an object or load suspended by a string of rods from a floating support or vessel and the sea floor therebelow so as to control the movement of the object or load with respect to the sea floor. There is both active and passive compensation provided by respective cylinder and piston assemblies associated with pressure accumulators. The passive compensation acts like spring. The active cylinder and piston assembly is of the double action type and disposed in parallel with the passive assembly. The active assembly compensates for residual vertical oscillations and operates as a function of two parameters : the position of the piston rod with respect to the cylinder of the active assembly and the velocity of the floating support with respect to the sea floor. Hydraulic control means operative in accordance with the parameters is connected to variable chambers of the active cylinder divided by its piston for varying the direction and flow rate of hydraulic fluid delivered thereto.

REFERENCES:
patent: 3693939 (1972-09-01), Buckson
patent: 3871622 (1975-03-01), Larralde et al.
patent: 3891038 (1975-06-01), Delegtnade et al.
patent: 3905580 (1975-09-01), Hooper
patent: 3912227 (1975-10-01), Meeker et al.
patent: 3948486 (1976-04-01), Jourdan et al.

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