Drilling apparatus

Details Drilling apparatus Drilling apparatus

1981-05-22

1983-11-08

Hirsch, Paul J.

Brakes

Rod

175422, E12B 300

Patent

active

044133871

ABSTRACT:
The structure disclosed is that part of a complete drilling apparatus which suspends the string of drill pipe in the well from the derrick floor. The apparatus is disclosed as automatically actuated to grip the pipe below the box on its upper end while either awaiting attachment to a hoist apparatus for tripping out of the well or makeup to a pipe stand in the drilling sequence.

REFERENCES:
patent: 1502628 (1924-07-01), Hanna
patent: 1844378 (1932-02-01), Campbell
patent: 2217072 (1940-10-01), Nixon
patent: 2231923 (1941-02-01), Koen
patent: 2257120 (1941-09-01), Lundeen
patent: 2633333 (1953-03-01), Storm
patent: 2803434 (1957-08-01), Heinish
patent: 3309130 (1967-03-01), Arrowood
patent: 3514822 (1970-06-01), Guier
patent: 3961399 (1976-06-01), Boyadjieff
patent: 3980143 (1976-09-01), Swartz et al.
patent: 4030542 (1977-06-01), Poe et al.

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