Crown block dead line anchor

Details Crown block dead line anchor Crown block dead line anchor

2007-01-23

2007-01-23

Marcelo, Emmanuel M (Department: 3654)

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

C254S286000

Reexamination Certificate

active

11097795

ABSTRACT:
The line system on a drilling rig is arranged to place the dead line clamp at the upper end of the derrick. A dead line anchor sheave is preferably located to accept wraps of the dead line to insure reduced load on the dead line clamp. The anchor sheave is preferably lockable to prevent rotation and releasable to rotate the anchor sheave for line feeding from a reserve line reel for maintenance operation. A load sensor is optionally provided to sense dead line load for sensing associated hook loads on the traveling block. An motor is provided, as an option, to rotate the anchor sheave for line feeding maintenance operations.

REFERENCES:
patent: 4105189 (1978-08-01), Beall
patent: 4423994 (1984-01-01), Schefers et al.
patent: 4434971 (1984-03-01), Cordrey
patent: 4787244 (1988-11-01), Mikolajczyk
patent: 4796863 (1989-01-01), Reed
patent: 4836300 (1989-06-01), Reed
patent: 4903443 (1990-02-01), Reed

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