Title: Hydraulically actuated machine tool

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Abstract: A rotating machine tool for hydraulically positioning a cutting tool mounting assembly lateral to the axis of rotation is disclosed. A collar circumscribing the axis of rotation and having an inclined annular downwardly directed recess is slidably mounted on the machine tool. A pair of diametrically opposed plungers ride within the inclined recess and are forced into reciprocal movement thereby. The reciprocating plungers pump hydraulic fluid from a reservoir within the machine tool into a pressure chamber. The pressure chamber is connected to a piston and cylinder assembly, which piston is positionally responsive to the pressure within the chamber. The movement of the piston is translated into lateral movement of the cutting tool via a spring biased mounting assembly. In operation, the rotation of the collar is restrained while the body of the machine tool rotates. The difference in rotation rate between the collar and the body causes the plungers within the body to ride upon the inclined annular recess and induces pumping of the hydraulic fluid. The hydraulic fluid is pumped into the pressure chamber and an increase in pressure therein causes the mounting assembly to be displaced. Actuation of a relief valve connected to the pressure chamber permits the mounting assembly to return to its initial position in response to the force exerted by the bias springs. The inclined annular recess may be mated with a mirror image positionable swash plate to provide selectively variable maximum vertical movement to the plungers to vary the rate of pumping. Hydraulically operated cutting tool attachments connectable to a hydraulic fluid takeoff on the assembly are also described.


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