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US Patent: 421,020
Wrench For Oil Well Tools
Patentee:
Dexter  J. Thayer - Pittsburgh, PA

USPTO Classifications:
81/52, 81/57.32, 81/57.34

Tool Categories:
wrenches : ratchet wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
G. F. Downing
E. J. Nottingham
P. B. Crosby
Frank R. Liggett

Patent Dates:
Applied: Feb. 28, 1889
Granted: Feb. 11, 1890

Patent Pictures:
Dexter J. Thayer patent February 11, 1890
USPTO pdf tiff
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Description:
A power wrench for drill stem links. The power is supplied by a lever that works gear teeth in a sliding block. The gear teeth engage rack teeth on a cross-member connecting two "hook jaw" wrenches. The lever handle has a pawl to reset the handle in relation to the gear teeth as the sliding block's position changes.

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