Handling: hand and hoist-line implements – Grapple – Collar-engaging
Patent
1977-12-22
1979-05-15
Cherry, Johnny D.
Handling: hand and hoist-line implements
Grapple
Collar-engaging
24249DP, B66C 110, E21B 1906
Patent
active
RE0299952
ABSTRACT:
This invention relates to an improved elevator as used in the drilling industry for latching onto and transporting drill pipe. The improvements are particularly adaptable for elevators used in a dual automatic elevator system as described in U.S. Pat. No. 3,063,509. The improvements include: (a) an arrangement wherein an elevator base may be utilized to accept a variety of different sizes of drilling pipe with a variety of different shoulder configurations on the tool joint end of the drilling pipe; (b) an elevator having a removable base so that the elevator may be utilized either for the dual automatic system of U.S. Pat. No. 3,063,509 or as an elevator as used in the commonly practiced single elevator drilling system; (c) an elevator having means for remotely unlatching the door when it is desired to remove the elevator from engagement with a drill pipe without requiring manual unlatching of the door; and (d) means of adjusting the angle of tilt of the elevator suspended by bails so that the elevator is properly orientated for engaging a drill pipe. These advantages and improvements are accomplished utilizing a removable bushing to accept different sizes of pipe, in conjunction with a replaceable door to match with each bushing, and the other improvements include removable lower plate, a pivotally adjustable counterweight for changing the angle of suspension of the elevator and hydraulically controlled linkage means for unlatching the elevator door by remote application of fluid pressure.
REFERENCES:
patent: 1490445 (1924-04-01), Wilson
patent: 1547282 (1925-07-01), Youker
patent: 1755986 (1930-04-01), Goetz et al.
patent: 2215649 (1940-09-01), Mullinix
patent: 2313243 (1943-03-01), Johnson
patent: 2684166 (1954-07-01), De Jarnett
patent: 3063509 (1962-11-01), Guier
patent: 3494484 (1970-02-01), McFadden
patent: 3833971 (1974-09-01), Grasman et al.
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