US Patent: 389,899
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| Pipe Wrench
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Patentee:
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| Daniel R. Porter (exact or similar names) - Chelsea, MA |
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Patent Dates:
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| Applied: |
Sep. 08, 1887 |
| Granted: |
Sep. 25, 1888 |
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Patent Pictures:
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Daniel R. Porter Patent. September 25, 1888 |
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Stan Schulz
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Description: |
| A rack on the main bar, a tooth at the base of the adjustable jaw, and two mountings with compression springs are the major features of this quick-adjusting pipe wrench. Known examples marked only with the patent date, and have leaf springs instead of the compression coil springs shown in the patent drawings.
Corresponding Canadian patent CA-27,657 and subsequent foreign patents ( Canadian patent CA-30,994 and British patent GB-188901609 ) provide suggestions for intermediate or alternate manufacturers. |
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