An improved dual blade boring tool assembly used in diametrical boring applications of a selected workpiece, including in combination,
- a solid surround carrier housing portion of a boring tool rotatable about a longitudinal axis, and having a pair of parallel extending and spaced apart circumferential annular transverse channel openings defined by the housing portion and extending entirely through the housing portion from one end wall to an oppositely disposed end wall, in perpendicular direction to the direction of rotation of the boring tool about the longitudinal axis thereof,
- an intermediate wall portion of the carrier housing portion including an upper wall portion and a lower divided wall portion, defining therebetween a narrowed slit-like gap opening, and including a pair of spaced apart planar side wall portions on the opposing side walls of the intermediate wall portion, the gap opening between the upper and lower portions of the intermediate wall portion opening into each of the transverse channel openings along the planar side walls of the intermediate wall portion,
- a pair of linear moveable cutter insert members, each one having an elongated annular base portion and a free end portion attached to the base portion thereof, the base portion thereof being insertedly received into an associated one of the pair of transverse channel openings, and moveable therein, the base portion of each of the pair of insert members having a planar wall portion that is aligned to pass in parallel alignment with and adjacent to the planar wall portion of the intermediate wall portion, to guide the linear movement of he associated insert member,
- each of the planar wall portions along the base portion of the insert members including a toothed pinion ridge portion defining a series of vertical raised ridges extended linearly along a preselected length dimension of the planar wall portion of the insert members, respectively, and being disposed in facing alignment with the pinion ridge portion of the parallel spaced apart insert members in the transverse channel openings,
- an elongated rotary cylindrical cam member including along a preselected length dimension thereof toothed rack ridge portion defining a series of vertical raised ridges extending circumferentially of the cam member, and the cam member being mounted to extend between and perpendicular to the parallel spaced apart planar wall portions of the base portions of the insert members, respectively, and into the transverse channel openings, and having the rack ridge portions thereof to meshingly engage with the pinion ridge portions of the insert members in the transverse channel openings, whereby rotary movement of the cam member reciprocates into corresponding linear movement of the insert members within the transverse channel openings, to adjust the cutter blades for boring operations,
- first fastener means perpendicularly engaging the cylindrical cam member to secure the cam member with respect to axial movement along the extended direction of the cam member, and
- second fastener means to perpendicularly engage the divided upper and lower wall portions of the intermediate wall portion of the carrier housing in a direction perpendicular to the lengthwise extension of the gap opening defined by the upper and lower wall portions of the intermediate wall portion, and to be tightened to provide closure movement of the gap opening to provide closure movement of the transverse channel openings whereby the insert members are tightened in the transverse channel openings.