Hydraulically actuated machine tool

Claim 1

A hydraulically operated machine tool attachable to and supported solely by a rigid spindle machine for laterally displacing a cutting element at a predetermined rate commensurate with the rate of rotation of the rigid spindle machine; said machine tool comprising in combination: a. a main body, said main body including an arbor extending therefrom for engagement with the collet of the rigid spindle machine to support said main body in relationship to a work piece; b. A reservoir of hydraulic fluid disposed within said main body; c. reciprocating means responsive to rotation of said main body and disposed within said main body for pumping the hydraulic fluid from said reservoir, said reciprocating means including: i. a plunger and a further plunger disposed within a cylindrical cavity and a further cylindrical cavity, respectively, in said main body; ii. a first passageway and a third passageway extending from said reservoir to said cylindrical cavity and to said further cylindrical cavity, respectively; iii. a second passageway and a fourth passageway extending from said reservoir to said pressure chamber; and iv. a check valve disposed within said first passageway to limit the flow of hydraulic fluid therethrough in one direction and a further check valve disposed within said third passageway to limit the flow of hydraulic fluid therethrough in one direction; d. selectively actuatable means disposed within said main body for controlling the length of the stroke of said reciprocating means to selectively vary the volume of hydraulic fluid pumped per revolution of said main body, said controlling means including: i. a swash plate for axially displacing said plunger; ii. means for restraining the rotational movement of said swash plate induced by said main body; and iii. said swash plate being of a non-uniform thickness; whereby, said swash plate induces reciprocating axial movement of said plunger in response to relative movement of said swash plate and said plunger; e. a pressure chamber disposed within said main body for receiving the hydraulic fluid pumped by said reciprocating means, including a pressure relief conduit for venting the hydraulic fluid back to said reservoir; f. a movable carriage slidably attached to said main body, said carriage being positionable lateral to the axis of said arbor in response to the volume of hydraulic fluid received by said pressure chamber; and g. means for attaching the cutting element to said carriage; whereby, said machine tool is self contained by including all operative elements necessary to rotate the cutting element at the rate of rotation of the rigid spindle machine while simultaneously selectively displacing the cutting element laterally at a rate determined by said controlling means.