Rotary power slips

Details Rotary power slips Rotary power slips

1980-07-03

1982-06-08

Hirsch, Paul J.

Buckles, buttons, clasps, etc.

Strap-end-attaching devices

Buckle connected

E21C 100

Patent

active

043332099

ABSTRACT:
Improved rotary power slips having a housing for mounting in a rotary table of an earth drilling rig. Air is transferred from a stationary fluid source on the drilling rig to pneumatic cylinders carried by the housing when said housing is static to operate said slips. Transfer is accomplished by expansion of a perforated annular bladder thereby forming an expansive fluid duct between a stationary seal ring connected to the stationary fluid source and an air transfer plate which is rotatable with the housing.

REFERENCES:
patent: 2730331 (1956-01-01), Harinck
patent: 3137348 (1964-06-01), Ahlstone et al.
patent: 3571865 (1971-03-01), Johnson
patent: 3579752 (1971-05-01), Brown
patent: 3748702 (1973-07-01), Brown
patent: 3999260 (1976-12-01), Stuckey et al.

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