US Patent: 833,516
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| Pipe Wrench
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Patentee:
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| Malcolm G. Ewer (exact or similar names) - Detroit, MI |
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Patent Dates:
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| Applied: |
Aug. 23, 1905 |
| Granted: |
Oct. 16, 1906 |
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Patent Pictures:
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Malcolm G. Ewer patent October 16, 1906 |
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Stan Schulz
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Description: |
| The adjusting screw is hinged to the base of the movable jaw with a compression spring to keep it engaged with rack teeth on the shank. Corresponding Canadian patent no. CA-103,072 was granted Jan. 15, 1907.
An October, 1908 ENGINEERING REVIEW item announced Ewer's participation in formation of the DETROIT WRENCH CO. to produce pipe and monkey wrenches.
A known example marked with this patent date and the Aug. 16, 1910 subsequent patent (no. 967,355) has nut wrench jaws. |
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