Ratchet feed drive for clamshell lathe
OwnerDonato L. Ricciinventor
Life of this patent
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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.
Claims6
A ratchet tool feed drive for a clamshell lathe, said clamshell lathe being of the type comprising a toroidal structure including a stationary member for clamping a cylindrical workpiece therein and a motor driven relatively movable member encircling said workpiece and rotatable about the longitudinal axis of said cylindrical workpiece, said ratchet tool feed drive comprising in combination:
- (a) guide block means attachable to said relatively movable member for rotation therewith, said guide block means including a guideway oriented radially relative to said workpiece when said guide block means is attached to said relatively movable member;
- (b) tool holding means disposed in said guideway of said guide block for reciprocal sliding movement therein, said tool holding means including a bore extending parallel to said guideway when said tool holding means is disposed within said guideway;
- (c) lead screw means having a threaded nut thereon and extending through said bore, said nut being in engagement with said tool holding means whereby rotation of said lead screw means imparts translational motion to said tool holding means in said guideway;
- (d) driven gear means attached to said lead screw;
- (e) cam actuated ratchet gear means selectively operatively coupled to said driven gear means;
- and
- (f) means attached to said stationary member for engaging said cam actuated ratchet gear means on each revolution of said movable member.
Dependencies are inferred from the claim text.