Spring devices – Fluid – Expansible-contractible chamber device
Patent
1975-08-04
1977-08-02
Marbert, James B.
Spring devices
Fluid
Expansible-contractible chamber device
166 85, F16F 918
Patent
active
040391760
ABSTRACT:
An apparatus is provided capable of absorbing shocks due to decelerating forces caused by landing of a marine riser on a spider resting on a rotary table. The apparatus includes a hydraulic shock absorber mounted on the rotary table which supports the spider on which the riser lands, the load and shock of the riser moving pistons in cylinders to force hydraulic oil in the cylinders through an orifice into an accumulator, effecting shifting of an accumulator piston against compressed air in the accumulator, which can exhaust through a pressure relief valve. The above action decelerates the riser and spider. Upon removing the weight of the riser from the spider, the compressed air in the accumulator, supplied from the suitable source, moves the accumulator piston back to its initial position, which acts through the hydraulic oil to effect upward return of the pistons to their initial positions. The apparatus permits lateral translation of the spider and also its tilting in all directions to limited degrees.
REFERENCES:
patent: 2170057 (1939-08-01), Kerr
patent: 2976930 (1961-03-01), Marquis et al.
patent: 3059917 (1962-10-01), Allinquant
patent: 3864922 (1975-02-01), Dial et al.
Marbert James B.
Vetco Offshore Industries, Inc.
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