Implements or apparatus for applying pushing or pulling force – Device or member for contacting and guiding moving cable – Including rotatable – cable contacting – pulley wheel element
Patent
1976-04-06
1978-05-23
Taylor, Dennis L.
Implements or apparatus for applying pushing or pulling force
Device or member for contacting and guiding moving cable
Including rotatable, cable contacting, pulley wheel element
61 90, 254 96, 254106, E02B 1708
Patent
active
040903672
ABSTRACT:
An offshore drilling platform with vertically movable legs comprises a buoyant body and a plurality of legs for supporting the body on the sea floor at an elevation above the water level. To permit floating the body for transportation, the legs are selectively vertically movable relative to the body; and in the present invention, this is effected by providing vertical racks on the legs that engage with power-driven pinions carried by the body. The pinion drive has two free-wheel devices, one which free wheels in one direction, and the other which free wheels in the other direction. Each free wheel is clutch connected to the pinion drive, so that when the legs are at an intermediate stage of being raised or lowered, and the platform is at about water level and the bottoms of the legs engage the sea floor, the appropriate free wheel is utilized to let the wave action speed the movement of the legs and platform relative to each other in the same direction that they are being more slowly driven by the pinion drive. In this way, the pounding of the bottoms of the legs on the sea floor is greatly diminished. Also, a system of slides and resilient connections between the legs and the platform absorbs the shocks and reduces the stresses between these elements.
REFERENCES:
patent: 2992812 (1961-07-01), Rasmussen et al.
patent: 3011467 (1961-12-01), LeTourneau
patent: 3290007 (1966-12-01), Yeilding
patent: 3392534 (1968-07-01), Blenkarn
patent: 3570032 (1971-03-01), Allen
patent: 3967457 (1976-07-01), Lovie
patent: 3986368 (1976-10-01), Levingston
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