US Patent: 5,319,890
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| Bushingless Workhead
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Patentee:
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| Jerry G. Warner (exact or similar names) - Slinger, Washington County, WI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 18, 1992 |
| Granted: |
Jun. 14, 1994 |
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Joel Havens
"Vintage Machinery" entry for Giddings & Lewis Manufacturing Co.
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Description: |
| Abstract
A bushingless workhead comprises a flexible drill collet inside a flexible chucking collet. The chucking collet has external frusto-conical surfaces on the ends thereof that mate with corresponding frusto-conical surfaces on a pair of pistons. The pistons are slidable within a housing away from each other to apply opposed forces to the chucking collet. The forces cause the chucking collet to collapse and to also collapse the drill collet to grip a tool inside the drill collet. One piston applies a greater force on the chucking collet than the other piston. The chucking collet is thus forced to move longitudinally in one direction, and it abuts a fixed reference surface that repeatably locates the chucking collet during each tool gripping operation prior to the chucking collet collapsing to grip the tool. |
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