Skip to content

The Antique Wrench Patent Archive

Every grip the nineteenth century took on a nut

Browse Dates Inventors Types About

Gear-locked jaw

Patent drawing of a monkey wrench showing a toothed shank with fixed upper jaw, a sliding frame with movable jaw held by two interlocking gear wheels, a thumb-lever at the base of the frame, and a wooden handle below.

IMPROVEMENT IN SCREW-WRENCHESDavid Frank · April 15, 1873

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.

About · Terms · Privacy · Corrections welcome — this archive gets better when collectors write in.