Rotary power slips

Details Rotary power slips Rotary power slips

1986-02-10

1987-07-21

Butler, Douglas C.

Brakes

Rod

81 5718, 81 5719, 173164, 173167, 277166, 277178, 277189, B65H 5910

Patent

active

046811931

ABSTRACT:
Rotary power slips mounted in the rotary table of an earth drilling rig and having slips for gripping and releasing pipe in the rotary table. The air transfer ring has concentric grooves in the upper surface. An annular seal ring is secured to the body of the rotary power slips and has a pair of air passageways. The air passageways lead to secondary fluid conduits in the body, which, in turn, lead to each end of the pneumatic cylinders to raise and lower the slips. Expansive rings are secured to the surface of the air transfer ring by mounting the edges of the rings into the grooves in the air transfer ring. When air pressure is applied through one of the primary fluid conduits, one of the expansive rings expands and cooperates with the lower surface of the seal ring to form an expansive fluid duct. The air pressure flows through a perforation in the expansive ring into the expansive fluid duct, and then through the air passageway and the secondary fluid conduit to the pneumatic cylinders. A pilot operated check valve maintains pressure in one end of the cylinders to keep the slips in the upper, retracted position. The check valve is opened when positive pressure is applied to the other end of the cylinders.

REFERENCES:
patent: 3579752 (1971-05-01), Brown
patent: 3995723 (1976-12-01), Holcomb, Jr.
patent: 3999260 (1976-12-01), Stuckey et al.
patent: 4024770 (1977-05-01), Liesenborghs
patent: 4333209 (1982-06-01), Herst
patent: 4345739 (1982-08-01), Wheatley
An Introduction to Hydraulics and Pneumatics, Bulletin 0225B-1, Parker Fluid Power, 1982, p. 8.2.

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