US Patent: 3,361,433
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| Collet Closer
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Patentee:
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| Warren B. Holdridge (exact or similar names) - Los Angeles, Los Angeles County, CA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 22, 1965 |
| Granted: |
Jan. 02, 1968 |
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Joel Havens
"Vintage Machinery" entry for Holdridge Mfg. Co.
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Description: |
| Claim:
A collet closer that comprises an air cylinder permanently mounted on the headstock of a lathe or comparable machine, the same having a through passage and provided with an adjusting nut for regulating the stroke of a piston operative in said cylinder. A bearing and mounting sleeve is held coaxially with the cylinder and piston by a radial bearing that provides for rotation of said sleeve relative to the air cylinder. A second radial bearing is provided between the piston and a retainer ring which has a sliding keyed connection with the mentioned bearing and mounting sleeve. A draw tube, commonly referred to as a drawbar, extends through the bearing and mounting sleeve and through the headstock of the lathe, the end thereof having a threaded connection with the spring collet of a chuck or other work-holding device extending from said headstock on the side thereof toward a tool or tools to operate on a workpiece held by the chuck. Said chuck, in any of the usual ways, is mounted on a rotationally driven lathe spindle housed in the headstock and through which the drawbar extends. The outer end of the drawbar is provided with a lock nut that has quick-release connection with the retainer ring and also a spring detent inter-engagement that affords rotational adjustment of said lock nut and of said drawbar so that by the threaded connection between the end of the latter and the collet a variable adjustment is effected in the opening of the collet, the adjustment making it possible to open or close clearance mounting on bar being worked. Said lock nut controls the travel of the piston to control and stop the travel of the collet in any specific required position. |
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