US Patent: 299,362
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Chuck
Spring-loaded, specially shaped jaws will grip either straight-shanked or tapered bits.
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Patentee:
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| Augustus E. Ellinwood (exact or similar names) - Akron, OH |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Dec. 01, 1883 |
| Granted: |
May 27, 1884 |
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Patent Pictures:
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Two images omitted for clarity |
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Steve Gosselin (GL)
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Description: |
| The jaws each have a cylindrical cross-piece that engages a transverse slot in the chuck's longitudinally slotted spindle. The jaws are tightened onto the shank of the bit by a pair of stationary and movable cones bear on the jaw's outer ramps when the outer shell is tightened. A circular spring attached to each of the jaws in turn presses them outwards. |
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