Ratchet feed drive for clamshell lathe

Details Ratchet feed drive for clamshell lathe Ratchet feed drive for clamshell lathe

1990-01-29

1990-07-31

Schmidt, Frederick R.

Turning

Portable lathe for pipe turning

82 702, 82137, B23B 322

Patent

active

049442058

ABSTRACT:
The present invention pertains to a cam-actuated ratchet feed drive for a clamshell lathe having a guide block attachable to the rotating ring gear of the clamshell and which slidingly supports a tool holding block in a dove-tail guideway. A threaded lead screw is coupled to the tool holding block and adapted to be driven either clockwise or counterclockwise by a cam-actuated pawl/racket combination. Means are provided for shifting a pair of pawls relative to associated ratchet wheels such that one, the other or neither of the ratchet wheels is driven upon engagement of the cam surface with a stationary cam follower.

REFERENCES:
patent: 4397202 (1983-08-01), Mayfield
patent: 4418591 (1983-12-01), Astle
patent: 4493232 (1985-01-01), Nall
patent: 4624052 (1986-11-01), Garcia
patent: 4677884 (1987-07-01), Kwech et al.
patent: 4739685 (1988-04-01), Ricci
patent: 4770074 (1988-09-01), Kwech
patent: 4776248 (1988-10-01), Berkestrand
patent: 4791842 (1988-12-01), Olson
patent: 4813314 (1989-03-01), Kwech
patent: 4823655 (1989-04-01), Vanderpol
patent: 4854200 (1989-08-01), Mynhier

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