Skip to content

The Antique Wrench Patent Archive

Every grip the nineteenth century took on a nut

Browse Dates Inventors Types About

Egg-shaped nut

Patent drawing of a pipe wrench showing a hooked stationary jaw with inward-pointing teeth, a movable toothed jaw sliding on a threaded shank through a slotted frame, an egg-shaped adjusting nut, and a long tapered wooden handle, with a separate cross-section view labeled Fig. 2 showing the nut and slot arrangement.

IMPROVEMENT IN PIPE-WRENCHESLawrence Glynn · May 7, 1878

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.