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US Patent: 268,408
Wrench For Bung Bushings
Patentee:
William W. Jackson (exact or similar names) - Chicago, IL

USPTO Classifications:
81/445

Tool Categories:
wrenches

Assignees:
William J. Jackson - Chicago, IL
William B. La Parle - Chicago, IL

Manufacturer:
Not known to have been produced

Witnesses:
Frank S. Blanchard
Matt A. Bick
Jno. G. Elliott
William B. La Parle

Patent Dates:
Applied: Sep. 29, 1882
Granted: Dec. 05, 1882

Patent Pictures:
William J. Jackson patent December 5, 1882
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Description:
The central core has a single vertical slot that allows it to expand outward to grip the inner surface of the bushing as the tapered threaded stem is screwed in.

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