Boring tool for small diameters

Claim 2

A cutting tool comprising; a housing, a boring bar pivotally mounted in the housing including a cutting point projecting therefrom, said bar and housing having interacting guide surfaces extending normal to the pivotal axis, longitudinally movable wedge means positioned within and acting between portions of the boring bar and housing longitudinally spaced from said pivotal mounting to provide lateral displacement of the cutting point upon longitudinal movement of the wedge means.

Claim 3

The cutting tool of claim 1, the bar having a portion of polygonal cross section within said housing.

Claim 4

The cutting tool of claim 2, wherein the polygonal cross section is rectangular.

Claim 5

A rotary cutting tool in accordance with claim 1 wherein the wedge means includes a rod adapted for actuation by a spindle push rod and having a planar surface inclined to the housing axis disposed to actuate adjustment of the bar.

Claim 6

The cutting tool of claim 1 including resilient means acting between portions of said housing and said bar longitudinally spaced from both said pivotal mounting and first named portions.

Claim 7

A cutting tool comprising, a housing, a boring bar pivotally mounted at one end of the housing including a cutting point projecting therefrom said bar and housing having interacting guide surfaces extending normal to the pivotal axis, longitudinally movable wedge means positioned within and acting between portions of the bar and housing longitudinally spaced from said pivotal mounting and adapted to displace laterally the cutting point upon longitudinal movement of the wedge means, and resilient means acting between portions of said housing and said bar longitudinally spaced from said pivotal mounting and said first named portions for preloading the bar against said wedge means and said pivotal mounting.

Claim 8

A cutting tool comprising, a housing, a boring bar pivotally mounted at one end of the housing including a cutting point projecting therefrom said bar and housing having interacting guide surfaces extending normal to the pivotal axis, longitudinally movable wedge means positioned within and acting between portions of the bar and housing longitudinally spaced from said pivotal mounting and adapted to displace laterally the cutting point upon longitudinal movement of the wedge means, and resilient means acting between portions of said housing and said bar longitudinally spaced from said pivotal mounting and said first named portions for preloading the bar against said wedge means and said pivotal mounting.

Claim 9

The cutting tool of claim 6 wherein said housing and bar include central apertures extending longitudinally therewithin and the wedge means is located within the bar aperture.

Claim 10

A rotary cutting tool as set forth in claim 7 wherein the wedge means includes a planar surface inclined with respect to the housing axis and adapted for actuation by a spindle push rod.

Claim 11

The cutting tool of claim 8 wherein the bar is provided with a flatted roller extending through the aperture and engaging the inclined surface.

Claim 12

The cutting tool of claim 8 wherein an extension of the wedge means engages the bar in the aperture at a second location axially spaced from the inclined planar surface.

Claim 13

The cutting tool of claim 10 wherein said first named housing portion includes adjustable reaction means engaging the wedge means.

Claim 14

The cutting tool of claim 6 wherein the bar includes a polygonal cross sectional portion within the housing having planar surfaces perpendicular to the pivot axis engaging the housing with a close sliding fit.

Claim 15

The cutting tool of claim 12 wherein the polygonal portion is rectangular with sufficient clearance for pivotal movement adjacent the sides parallel to the pivot axis.

Claim 16

The cutting tool of claim 8 wherein the resilient means include spring means and the inclined surface is located longitudinally between the pivot and the spring means.

Claim 17

A rotary cutting tool comprising, a hoUsing, a boring bar pivotally mounted in the housing and having a cutting point provided at one end, an aperture extending axially within the bar, an axially actuatable rod extending within the aperture and slidably engaging the bar therewithin, a planar wedging surface on the rod inclined to the axis of the housing and axially spaced from the engagement of the rod and bar and the pivotal mounting, a reaction surface in the bar engaging the inclined surface for pivotal movement of the bar upon actuation of the rod, reaction means engaging the rod opposite said wedging surface and retained in the housing, resilient means acting between said housing and bar axially spaced from the pivotal mounting and the wedging surface for preloading the bar against said pivotal mounting and reaction means, and a rectangular cross section on at least a portion of the bar within the housing having a close sliding fit on the sides perpendicular to the pivot axis and sufficient clearance for pivotal movement adjacent the sides parallel to the pivot axis.

Claim 18

A rotary cutting tool comprising, a hoUsing, a boring bar pivotally mounted in the housing and having a cutting point provided at one end, an aperture extending axially within the bar, an axially actuatable rod extending within the aperture and slidably engaging the bar therewithin, a planar wedging surface on the rod inclined to the axis of the housing and axially spaced from the engagement of the rod and bar and the pivotal mounting, a reaction surface in the bar engaging the inclined surface for pivotal movement of the bar upon actuation of the rod, reaction means engaging the rod opposite said wedging surface and retained in the housing, resilient means acting between said housing and bar axially spaced from the pivotal mounting and the wedging surface for preloading the bar against said pivotal mounting and reaction means, and a rectangular cross section on at least a portion of the bar within the housing having a close sliding fit on the sides perpendicular to the pivot axis and sufficient clearance for pivotal movement adjacent the sides parallel to the pivot axis.

Claim 19

The cutting tool of claim 15 wherein the resilient means include spring means and the inclined surface is located axially between the pivot and the spring means.