Dual cutter boring head

A dual cutter boring head comprising a body adapted for rotation about a predetermined axis, the body having a diametral channel therein, a pair of tool-holding slides disposed in side-by-side relation in the channel, each slide having an outer end projecting from a corresponding side of the body, a cutter mounted on each slide at said outer end, a rotatable member journaled in the body, means in the body between said member and the slides operative--upon part-circle rotation of such member--to move the slides in opposition in the channel to adjust the cutters, means in the body in part accessible from exteriorly thereof arranged to cause such part-circle rotation of said member, and releasable means normally securing the slides against movement in the channel;

• the means to cause part-circle rotation of said member including a screw, and a motion-translating connection between the screw and said member;
• and said motion-translating connection comprising a nut threaded on and lineally movable along the screw upon rotation thereof, the nut having a laterally opening socket formed thereon, the screw being parallel to the axis of the member, a radial spindle on and projecting from the member, and a ball on the outer end of the spindle engaged in the socket.

A dual cutter boring head comprising a body adapted for rotation about a predetermined axis, the body having a diametral channel therein, a pair of tool-holding slides disposed in side-by-side relation in the channel, each slide having an outer end projecting from a corresponding side of the body, a cutter mounted on each slide at said outer end, a rotatable member journaled in the body, means in the body between said member and the slides operative--upon part-circle rotation of such member--to move the slides in opposition in the channel to adjust the cutters, means in the body in part accessible from exteriorly thereof arranged to cause such part-circle rotation of said member, and releasable means normally securing the slides against movement in the channel;

• the means to cause part-circle rotation of said member comprising a screw extending in adjacent but spaced relation to the member and parallel to its axis, a nut threaded on and lineally movable along the screw upon rotation thereof, the screw having an operating end accessible from exteriorly of the body, a socket formed on the nut and opening toward said member, a radial spindle fixed on said member and projecting toward the socket, and a ball on the outer end of the spindle engaged in the socket.

A dual cutter boring head comprising a body adapted for rotation about a predetermined axis, the body having a diametral channel therein, a pair of tool-holding slides disposed in side-by-side relation in the channel, each slide having an outer end projecting from a corresponding side of the body, a cutter mounted on each slide at said outer end, a rotatable member journaled in the body, means in the body between said member and the slides operative--upon part-circle rotation of such member--to move the slides in opposition in the channel to adjust the cutters, means in the body in part accessible from exteriorly thereof arranged to cause such part-circle rotation of said member, and releasable means normally securing the slides against movement in the channel;

• the channel having a bottom, and a face of said member being open to said bottom of the channel, the member being journaled for rotation about the axis of the body, and said slide moving means comprising a pair of pins on said member in spaced-apart, radially-opposed relation, the pins projecting from the face of said member into the channel, the slides having transverse slots therein, and the pins engaging in corresponding slots.