US Patent: 432,928
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| Wrench For Screw Drivers
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Patentee:
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| Marcus J. Bartlett (exact or similar names) - Providence, RI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 12, 1889 |
| Granted: |
Jul. 22, 1890 |
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Patent Pictures:
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Marcus J. Bartlett patent July 22, 1890 |
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Stan Schulz
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Description: |
| A folding lever handle pivots in a frame. The interior end of the handle presses against a shoe. The interior surface of the shoe and frame have teeth to grip the shank when clamped against the shank by the lever handle. A spring on the shoe holds the handle flat against the screwdriver shank when not in use. |
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