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US Patent: 249,477
Wrench
Patentee:
August Nelson (exact or similar names) - Kent, OH

USPTO Classifications:
81/171, 81/DIG.3

Tool Categories:
wrenches : wrench components : wrench adjustment locks

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
J. W. Holcomb
George F. Robinson
Patent Dates:
Applied: May 12, 1881
Granted: Nov. 15, 1881

Patent Pictures:
August Nelson Pat. November 15, 1881
USPTO (New site tip)
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Description:
A spring catch on the side of a screw wrench engages notches on the adjusting screw. This feature serves as an adjustment lock.

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