Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which... – With fixed means cyclically contacted by grip structure
Patent
1980-06-11
1982-02-09
Reynolds, Wm. Carter
Tool driving or impacting
Hammer or tool shaft reciprocated by gripping means which...
With fixed means cyclically contacted by grip structure
173163, 173DIG3, E21B 300, E21C 710
Patent
active
043146112
ABSTRACT:
A top head drive unit for an earth boring apparatus including a derrick comprises a support member guided along the derrick. The support member includes a pair of spherical roller bearings which support a shaft adapted for connection to a drill string. These roller bearings accommodate a selected degree of movement in the axis of rotation of the shaft. The shaft extends up above the support member, and a rotary drive unit is mounted to the shaft immediately above the support member. Precision roller bearings are used to align the drive unit precisely on the shaft such that the drive unit follows the movement of the shaft as it rotates in the spherical roller bearings of the support member and a torque arm is mounted between the support member and the rotary drive unit to prevent rotation of the rotary drive unit with respect to the support member. A drilling fluid seal is rigidly mounted to the upper surface of the drive unit to follow the movement of the shaft precisely and thereby to provide a fluid tight seal through which drilling fluids can be passed into the shaft.
REFERENCES:
patent: 1398551 (1921-11-01), Hanson
patent: 2334312 (1943-11-01), Caldwell
patent: 2964115 (1960-12-01), Clatfelter
patent: 2998084 (1961-08-01), Johnson et al.
patent: 3736993 (1973-06-01), West
patent: 3741318 (1973-06-01), Klein et al.
patent: 3776320 (1973-12-01), Brown
Reynolds Wm. Carter
Walker-Neer Manufacturing Co. Inc.
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