Boring bar insert

Claim 2

A boring bar insert comprising a. a cutting tool having an exteriorly threaded shank and a cutting head on one end of the shank; b. an adjustment sleeve comprising axially aligned, interiorly threaded outer and inner portions which are in threaded engagement with the shank of the cutting tool and which are interconnected for rotation as a unit relative to the shank but are axially movable relative to each other to eliminate axial play between the mating threads of the shank and the sleeve portions; c. a bushing coaxially surrounding the adjustment sleeve and comprising axially aligned outer and inner portions and means holding the bushing portions against relative rotation while permitting relative axial movement, the outer bushing portion having means for firmly securing it to a boring bar; d. cooperating seating means on the outer bushing portion and the outer adjustment sleeve portion supporting the outer sleeve portion for rotation in a fixed position within the outer bushing portion; e. guide means for preventing relative rotation of the bushing and the tool so that rotation of the adjustment sleeve causes axial movement of the tool relative to the adjustment sleeve and the bushing; f. spring means acting between the bushing portions to resiliently load the inner bushing portion axially relative to the outer bushing portion; and g. anti-friction coupling means positively interconnecting the inner bushing portion and the inner adjustment sleeve portion for axial movement together so as to transfer the resilient axial load from the inner bushing portion to the inner adjustment sleeve portion, and simultaneously permitting relative rotation of the inner bushing and sleeve portions at low friction.

Claim 3

A boring bar insert as set forth in claim 1 in which the bushing is integral and the spring means comprise an intermediate bushing portion between said inner and outer bushing portions, the intermediate bushing portion having at least two transverse, axially spaced slots therethrough which are circumferentially offset from each other so as to overlap at their ends.

Claim 4

A boring bar insert as set forth in claim 1 in which the coupling means comprise rolling-contact bearing bodies disposed in opposed annular grooves in the exterior surface of the inner adjustment sleeve portion and the interior surface of the inner bushing portion, respectively.

Claim 5

A boring bar insert as set forth in claim 3 in which the rolling-contact bearing bodies are balls.

Claim 6

A boring bar insert as set forth in claim 2 in which the adjustment sleeve is integral and comprises a resilient intermediate sleeve portion between said inner and outer sleeve portions, the intermediate sleeve portion having at least two transverse axially spaced slots therethrough which are circumferentially offset from each other so as to overlap at their ends.

Claim 7

A boring bar insert as set forth in claim 5 in which the adjustment sleeve is interiorly threaded also on the iNtermediate sleeve portion.

Claim 8

A boring bar insert as set forth in claim 1 in which the end of the bushing remotest from the cutting head of the tool comprises an inwardly extending portion having an axially extending noncircular opening therein and in which the adjacent end of the shank is provided with a noncircular axial extension fitting slideably in said opening.

Claim 9

A boring bar insert comprising a. a cutting tool having an exteriorly threaded shank and a cutting head on one end of the shank; b. an adjustment sleeve comprising axially aligned, interiorly threaded outer and inner portions which are in threaded engagement with the shank of the cutting tool and which are interconnected for rotation as a unit relative to the shank but are axially movable relative to each other to eliminate play between the mating threads of the shank and the sleeve portions; c. an integral bushing coaxially surrounding the adjustment sleeve and comprising axially aligned outer, intermediate, and inner portions, the outer bushing portion having means for firmly securing it to a boring bar, and the intermediate bushing portion having at least two transverse, axially spaced slots therethrough which are circumferentially offset from each other so as to overlap at their ends and define between the overlapping portions circumferentially extending, axially yieldable leaf-type springs, d. annular bearing means on the outer bushing portion and on the outer adjustment sleeve portion cooperating to support the outer adjustment sleeve portion for rotation in a fixed position within the outer bushing portion; e. guide means for preventing relative rotation of the bushing and the tool so that rotation of the adjustment sleeve causes axial movement of the tool relative to the adjustment sleeve and the bushing; and f. means for maintaining the intermediate bushing portion in an axially compressed state, these means including rolling-contact bearing bodies disposed in a pair of opposed annular grooves in the exterior surface of the inner adjustment sleeve portion and the interior surface of the inner bushing portion, respectively, and positively interconnecting the inner sleeve and bushing portions for axial movement inwardly as a unit, so that the adjustment sleeve portions are urged axially apart.

Claim 10

A boring bar insert comprising a. a cutting tool having an exteriorly threaded shank and a cutting head on one end of the shank; b. an adjustment sleeve comprising axially aligned, interiorly threaded outer and inner portions which are in threaded engagement with the shank of the cutting tool and which are interconnected for rotation as a unit relative to the shank but are axially movable relative to each other to eliminate play between the mating threads of the shank and the sleeve portions; c. an integral bushing coaxially surrounding the adjustment sleeve and comprising axially aligned outer, intermediate, and inner portions, the outer bushing portion having means for firmly securing it to a boring bar, and the intermediate bushing portion having at least two transverse, axially spaced slots therethrough which are circumferentially offset from each other so as to overlap at their ends and define between the overlapping portions circumferentially extending, axially yieldable leaf-type springs, d. annular bearing means on the outer bushing portion and on the outer adjustment sleeve portion cooperating to support the outer adjustment sleeve portion for rotation in a fixed position within the outer bushing portion; e. guide means for preventing relative rotation of the bushing and the tool so that rotation of the adjustment sleeve causes axial movement of the tool relative to the adjustment sleeve and the bushing; and f. means for maintaining the intermediate bushing portion in an axially compressed state, these means including rolling-contact bearing bodies disposed in a pair of opposed annular grooves in the exterior surface of the inner adjustment sleeve portion and the interior surface of the inner bushing portion, respectively, and positively interconnecting the inner sleeve and bushing portions for axial movement inwardly as a unit, so that the adjustment sleeve portions are urged axially apart.