US Patent: 3,988,965
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| Two Pressure Counterbalance System for Machine Tool Headstocks
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Patentees:
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| Donald J. Cayen (exact or similar names) - Fond Du Lac, Fond Du Lac County, WI |
| Orville W. Ehrhardt (exact or similar names) - Fond Du Lac, Fond Du Lac County, WI |
| Richard V. Fatke (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: |
Dec. 16, 1971 |
| Granted: |
Nov. 02, 1976 |
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Joel Havens
"Vintage Machinery" entry for Giddings & Lewis Manufacturing Co.
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Description: |
| Abstract:
A counterbalance mechanism for a vertically movable machine tool headstock in which the net counterbalance force applied to the headstock is the same for both upward and downward movement of the headstock so that the accuracy of the spindle alignment is not disturbed by such movement. The counterbalance mechanism includes a hydraulic control system which automatically provides a greater pressure to a hydraulic counterbalance cylinder during raising movement of the headstock than during lowering movement so that difference in forces exerted by the counterbalance cylinder as a result of said pressure differential compensates for frictional resistive forces in the counterbalance mechanism and thereby enables the same net counterbalance force to be applied to the headstock. |
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