Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent
1978-06-05
1980-03-11
Lazarus, Ira S.
Boring or penetrating the earth
Below-ground impact members
With releasable means to detachably retain telescoping...
175321, F16D 306, E21B 1700
Patent
active
041921550
ABSTRACT:
A floating cushion sub for connection to the rotary power head of a drill rig has a mandrel section connectable to a drill string and an outer housing section connectable to the power head. The mandrel and the housing have mating, axially extending splines permitting relative axial movement while also transmitting torque from the power head to the mandrel. Mandrel axial movement is limited by a cap member and by an internal shoulder in the housing. A resilient cushion adjacent the shoulder dampens vibrations when the mandrel and housing are compressed together and a similar cushion adjacent the cap member dampens vibrations when the mandrel and housing are at full extension. The axial movement of the mandrel relative to the housing improves the function of making or breaking the threaded connections with the drill string by permitting proper coordination of the mating thread pitches and reduces the chance of cross-threading.
REFERENCES:
patent: 2240519 (1941-05-01), Reed
patent: 2570577 (1951-10-01), Manion
patent: 3301009 (1967-01-01), Coulter
patent: 3383126 (1968-05-01), Salvatori
patent: 3526284 (1970-09-01), Burge
patent: 3949150 (1976-04-01), Mason
patent: 3963228 (1976-06-01), Karle
patent: 4055338 (1977-10-01), Dyer
patent: 4130000 (1978-12-01), Burge
patent: 4139994 (1979-02-01), Atther
Bralorne Resources Limited
Lazarus Ira S.
Rock H. Wayne
Turner R. C.
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