US Patent: 3,753,383
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| Power Operated Drawbolt
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Patentee:
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| Frederick L. Schmidt (exact or similar names) - Fond Du Lac, Fond Du Lac County, WI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 04, 1972 |
| Granted: |
Aug. 21, 1973 |
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Joel Havens
"Vintage Machinery" entry for Giddings & Lewis Manufacturing Co.
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Description: |
| Abstract:
A power draw-bolt assembly for releasably clamping a tool in the socket of a machine tool spindle. The assembly includes a draw-bolt that is biased in a rearward direction relative to the spindle and in an opposite forward direction relative to a concentrically mounted drive sleeve whereby the draw-bolt is readily accessible for engaging a tool automatically inserted into the spindle socket and is resiliently supported to absorb excessive axial forces that may be imparted to the draw-bolt. A separate ejector tube mounted concentrically on the draw-bolt is adapted to be forwardly moved relative to the spindle and draw-bolt to strike and positively release a tool adaptor from seating engagement with the spindle socket after the draw-bolt has completely unthreaded from the tool adaptor. The operation of the draw-bolt and ejector tube are synchronized by an actuating mechanism driven from a single motor. |
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