E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/14.2
E21B 19/10 (2006.01)
Patent
CA 1140528
ABSTRACT OF THE DISCLOSURE 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.
371567
Herst Neil W.
Bj-Hughes Inc.
Gowling Lafleur Henderson Llp
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