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Description: |
| The patent combines the steep pitch thread and friction-reducing bearing of Wenger's U.S. patents no. 572,185 and 572,186 for "side-worm adjust" and "center knurled nut adjust" pocket wrenches. Corresponding British patent GB-189627293 was registered Dec. 1, 1896, and German patent DE-98,590 was granted with effective date Dec. 1, 1896.
The corresponding U.S. patents were granted Dec. 1, 1896.
The form in 572,185 (i.e Fig. 4 in 1st image) with subsequent refinements was produced as the "ball bearing wrench." |
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