US Patent: 3,350,617
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| Positioning Device for Use on Machine Tools
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Patentee:
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| John Firth (exact or similar names) - Arbroath, Angus Scotland |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Feb. 08, 1965 |
| Granted: |
Oct. 31, 1967 |
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Joel Havens
"Vintage Machinery" entry for Giddings & Lewis Manufacturing Co.
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Description: |
| Claims priority, application filed in Great Britain, 22 Feb., 1964.
Abstract:
A stop-motion switch in a machine tool has two side- by-side plungers depressible independently and together by a projection secured to the worktable. Each plunger carries one of two switch contacts arranged to break contact when the plungers are depressed one relative to the other by more than a predetermined amount, the final signal to stop motion being given by the contacts making contact when the plungers have been depressed successively by the projection. |
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