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The Antique Wrench Patent Archive

Every grip the nineteenth century took on a nut

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Bung-bush wrench

Patent drawing of a bung-bush insertion wrench showing a rounded head with a crossbar handle, a conical screw-threaded stem, four expanding corrugated plates arranged around the stem, and a retaining cap secured by a nut at the base, shown in elevation, cross-section, and end views.

IMPROVEMENT IN WRENCHES FOR INSERTING BUNG-BUSHESDavid Ackerman · March 11, 1879

United States patent drawings and specifications are works of the U.S. government and are in the public domain — they were never copyrighted. Download them, print them, frame them. Our commentary and descriptions are © 2026 The Antique Wrench Patent Archive.

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