04809792 is referenced by 10 patents and cites 1 patents.

A top driven driling unit including a motor drive assembly for rotating a drill string and a handling system for supporting the drill string. The motor drive assembly includes a drill motor, a swivel bearing for supporting the load of the drill string during drilling and a sub assembly for connecting the drill motor to the drill string. The handling system includes a housing for supporting the swivel bearing, a handling ring, a stem for supporting the load of the drill string during tripping, an elevator, elevator links for supporting the elevator from the handling ring, a traveling block, and support links for supporting the housing from the traveling block. The structural relationship between the handling ring, the stem, and the housing provides an alternative load path for elevator loads during tripping or when running well casing liner that bypasses the swivel bearing.

Title
Support system for a top driven drilling unit
Application Number
7/163584
Publication Number
4809792
Application Date
March 3, 1988
Publication Date
March 7, 1989
Inventor
James E Lynch
Dallas
TX, US
Agent
L A Fillnow
R H Johnson
R J Bunyard
Assignee
National Oilwell
TX, US
IPC
E21B 19/06
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