Crown block

Details Crown block Crown block

1973-11-29

1976-02-24

Spar, Robert J.

Implements or apparatus for applying pushing or pulling force

Portable implements or apparatus for tensioning flexible...

254188, B66D 136

Patent

active

039401120

ABSTRACT:
Disclosed is an open center crown block pivotally mounting a pair of sheaves on each of the opposite sides of the well centerline. On one side of the crown block, there is pivotally mounted a crossover sheave for transferring the drilling line from one side of the well centerline to the opposite side thereof. Opposite the crossover sheave is a fastline sheave for aligning the drilling line from the draw works vertically above the travelling block. On another side of the frame, there is provided a deadline sheave for transferring the drilling line from the crown block to an anchor point on the mast or substructure. The crossover, fastline and deadline sheaves are spaced from the well centerline leaving the central portion of the crown block clear for receiving motion compensators or other drilling equipment thereby rendering unnecessary any increase in height of the mast in order to receive the compensator or other tools.

REFERENCES:
patent: 1833172 (1931-11-01), Minor
patent: 1928958 (1933-10-01), Young et al.
patent: 2440427 (1948-04-01), Bender
patent: 2601611 (1952-06-01), Hilborn et al.
patent: 2734718 (1956-02-01), Minor
patent: 2737367 (1956-03-01), Woolslayer et al.
patent: 2766009 (1956-10-01), Wilson
patent: 2975601 (1961-03-01), Thorson
patent: 3366366 (1968-01-01), Arthur
patent: 3652058 (1972-03-01), Ashton

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