US Patent: 749,544
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| Wrench
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Patentee:
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| William H. Ermentrout (exact or similar names) - Reading, PA |
| USPTO Classifications: |
| 81/96 |
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Patent Dates:
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| Applied: |
Sep. 23, 1903 |
| Granted: |
Jan. 12, 1904 |
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Patent Pictures:
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William H. Ermentrout patent January 12, 1904, with ERMO pipe wrench -- Richard Lawton collection |
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Stan Schulz
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Description: |
| A compression spring inside the hollow handle pushes the sliding grip with its roller jaw against the hook jaw. The gear teeth on the roller jaw and rack teeth on the frame tighten the grip.
The manufacturer is noted in Ken Cope's "American Wrench Makers 1830-1930." |
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