US Patent: 3,818,797
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| Drawbolt for Machine Tool Spindles
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Patentee:
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| William D. Zettler (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: |
May 10, 1973 |
| Granted: |
Jun. 25, 1974 |
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Joel Havens
"Vintage Machinery" entry for Giddings & Lewis Manufacturing Co.
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Description: |
| Abstract:
A power operated rotary draw-bolt for clamping tools in a machine tool spindle tool adapter socket in which the tool coupling end of the draw-bolt includes a threaded fitting which is replaceable through the socket end of the spindle.
Background/Summary
(1) This invention relates to power draw-bolts for releasably securing tool adapters to machine tool spindles. My U.S. Pat. No. 2,924,152 discloses a power operated rotary draw-bolt of the type to which the present invention is applicable. This patented draw-bolt has proven to be commercially successful. However, after many thousands of operating cycles, the threads on the outer end of the draw-bolt which engage the tool adapter sometimes wear out requiring replacement of the entire draw-bolt. Removal of the draw-bolt, which must be done from the rear end of the spindle, requires partial dismantling of the machine. This in turn requires that there be sufficient space between the machine and adjacent structures to allow the lengthy draw-bolt to be extracted from the spindle. Thus, replacement is time consuming and costly. The frequency of replacement has been intensified when the draw-bolt is used on machines operating automatically or semi-automatically under numerical control. |
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