US Patent: 1,203,178
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Chuck
Ball-bearing, geared, three jaw chuck.
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Patentee:
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| Earnest C. Bowers (exact or similar names) - Kalamazoo, MI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 19, 1915 |
| Granted: |
Oct. 31, 1916 |
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Patent Pictures:
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All but one patent image condensed here. |
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Steve Gosselin (GL)
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Description: |
| Chuck takes advantage of the ball bearings and a left-handed axial thread to add to the usual tendency to grip the bit tighter, the greater the drilling torque applied to the chuck. |
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