US Patent: 634,216
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| Wrench
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Patentee:
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| William H. Robinson (exact or similar names) - Marion, IA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Feb. 15, 1898 |
| Granted: |
Oct. 03, 1899 |
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Patent Pictures:
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William H. Robinson patent Oct. 3, 1899 |
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Stan Schulz
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Description: |
| Quick adjust; paired pawls with teeth a "half click" apart engage rack teeth on the main shank for size adjustment. The pawls are held in engagement with the rack teeth by leaf springs and lifted by a looped wire yoke. The pipe gripping teeth on the movable jaw have a spring to help provide the "grip and release" action needed by pipe wrenches. The wrench could also be constructed with smooth jaws. |
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