US Patent: 393,419
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| Screw Driver
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Patentee:
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| Felix Chantrell (exact or similar names) - Reading, PA |
| USPTO Classifications: |
| 81/29 |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 06, 1888 |
| Granted: |
Nov. 27, 1888 |
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Patent Pictures:
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Felix Chantrell patent November 27, 1888 |
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Stan Schulz
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Description: |
| The interior of the handle has gripping teeth matching gripping teeth on the top of the shank of the screwdriver blade, with a compression spring to separate them. This allows the handle to operate in "ratchet" fashion. |
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