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US Patent: 389,685
Wrench
Patentee:
William H. Brock - Brooklyn, NY

USPTO Classifications:
81/68

Tool Categories:
wrenches : pipe wrenches : chain and strap wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
C. Sedgwick
J. E. Clark
J. E. Kitson
J. L. McAuliffe

Patent Dates:
Applied: Dec. 12, 1887
Granted: Sep. 18, 1888

Patent Pictures:
William H. Brock patent September 18, 1888
USPTO pdf tiff
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Description:
The "first" link of the chain is also the latching link. The patent calls this piece a clutch. The cross pin that holds the chain on to the bar does not bear any of the strain when the wrench is in use. The chain is an improvement on the chain in Brock's July 12, 1887 patent (no. 366,451). The gripping surface on the bar is called a shoe, and has longitudinal grooves as well as transverse teeth.

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