US Patent: 643,520
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| Sprocket Wheel Wrench
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Patentee:
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| Charles H. Monroe (exact or similar names) - Searsport, ME |
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Patent Dates:
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| Applied: |
Dec. 26, 1899 |
| Granted: |
Feb. 13, 1900 |
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Patent Pictures:
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Charles H. Monroe Pat. February 13, 1900 |
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Stan Schulz
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Description: |
| The small link chain and teeth on the gripping surface of this chain wrench are sized for bicycle chain wheels.
The wrench appears as the STEVENS SPROCKET WRENCH in a 1919 MOTORCYCLING & BICYCLING advertisement. A 1923 Shapleigh Hardware catalog lists an improved version with a spring to hold the chain in engagement with the sprockets so the wrench could be used two-handed. |
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