Self-locking chock system for a jack-up rig unit

Details Self-locking chock system for a jack-up rig unit Self-locking chock system for a jack-up rig unit

1983-05-26

1985-03-19

Taylor, Dennis L.

Hydraulic and earth engineering

Marine structure or fabrication thereof

With work deck vertically adjustable relative to floor

254110, 405196, E02B 1708

Patent

active

045056161

ABSTRACT:
The self-locking chock system has a plurality of pawl cams grouped in a sequential alignment along a support member that is substantially parallel with a leg rack of a jack-up rig unit. Each of the cams is pivoted about a pivot axis that is on the common alignment axis of the support member, and is forced to ride upon the leg rack by a center of gravity located outwardly from the alignment axis on the side opposite that which rides on the leg rack. The cam profile is adapted to ride along the leg rack profile when the relative motion between the leg rack and the support member is in a first direction. When the relative motion is in a direction opposite to the first direction, the cam profile complements the leg-rack profile and under the weighted urging of the cam, the cam profile engages the leg-rack profile and enters into a positive, self-locking engagement that restrains further relative motion between the leg rack and the support member at least in the opposite direction.

REFERENCES:
patent: 103899 (1870-06-01), Lewis
patent: 2540679 (1951-02-01), Laffaille
patent: 3273859 (1966-09-01), Walli
patent: 3332663 (1967-07-01), Cargile
patent: 3570812 (1971-03-01), Finkbeiner
patent: 4032112 (1977-06-01), Schmidt

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