Adjustable boring tool

Claim 2

An adjustable boring tool comprising a boring block, said boring block having oppositely disposed, spaced-apart cutting tools thereon, motion determining means for simultaneously advancing both of said cutting tools out from or toward the center of the boring block to adjust the diameter of the bore, and unitary means engaging said motion determining means for equalizing the distance between the center of said block and the cutting edge of each of said cutting tools by moving said motion determining means in either direction along its longtiduinal axis relative to the center of the boring tool.

Claim 3

The adjustable boring tool of claim 1 and means for retaining said equalized distance.

Claim 4

The adjustable boring tool of claim 1 wherein said boring block comprises a centrally located fixed section, a first and a second moveable section disposed on opposite sides of said fixed section, means for mounting said cutting tools on said moveable sections, and cooperating means on said moveable sections for cooperating with said motion determining means to simultaneously move both of said moveable sections to advance both of said cutting tools out from or toward the center of the boring block to adjust the diameter of the bore.

Claim 5

The adjustable boring tool of claim 3 wherein means are provided to assure linear movement of said moveable sections.

Claim 6

The adjustable boring tool of claim 3 wherein means are provided for limiting the movement of said moveable sections.

Claim 7

The adjustable boring tool of claim 3 wherein said motion determining means comprises a main screw, means for retaining said main screw in said central fixed section, even when said main screw rotates about its axis, and wherein said cooperating means on said moveable sections comprise threaded apertures for threadingly receiving said main screw therein to cause said moveable sections to move toward or away from the center of said block responsive to said main screw rotating about its own axis.

Claim 8

The adjustable boring tool of claim 6 wherein said fixed section comprises a central section, first and second wing sections oppositely disposed from said central section, said moveable sections shaped to ride on said wing sections and to abut said central section at the smallest diameter of the bore.

Claim 9

The adjustable boring tool of claim 7 wherein a groove is provided on each of said moveable sections, threaded hole means on said wing sections, said threaded hole being aligned with said groove, and threaded fastener means in said threaded holes passing into said grooves to limit the movement of said moveable sections.

Claim 10

the adjustable boring tool of claim 8 wherein said grooves include shoulder means around the bottom periphery of said groove, said threaded fastener means having head means thereon which loosely abut said shoulder means to slidingly attach said moveable sections to said fixed section.

Claim 11

An adjustable boring tool comprising a boring block, said boring block having a centrally located fixed section, a first and a second movable section disposed on opposite sides of said fixed section, means for mounting said cutting tools on said movable sections, each of said movable sections having a cutting tool oppositely disposed thereon, a main screw for simultaneously advancing both of said cutting tools out from or toward the center of the boring block to adjust the diameter of the bore, threaded apertures on said movable sections for cooperating with said main screw tO simultaneously move both of said movable sections, means for retaining said main screw in said center fixed section even when said main screw rotates about its axis, said fixed section comprising a central section, first and second wing sections oppositely disposed from said central section, said moveable sections being shaped to ride on said wing sections and to abut said central section with the smallest diameter of the bore, groove means provided on each of said movable sections, threaded hole means on said wing sections, said threaded hole means being aligned with said groove means, threaded fastener means in said threaded holes passed through said holes to limit the movement of said movable sections, said groove means including shoulder means around the bottom periphery of said groove means, said threaded fastener means having head means which loosely abut said shoulder means to slidingly attach said movable sections to said fixed sections and a keyway provided in each of said wing sections, an aligned keyway in each of said movable sections aligned with the keyway in said wing sections, and a key for each of said aligned keyways to assure linear motion of said movable sections.

Claim 12

An adjustable boring tool comprising a boring block, said boring block having a centrally located fixed section, a first and a second movable section disposed on opposite sides of said fixed section, means for mounting said cutting tools on said movable sections, each of said movable sections having a cutting tool oppositely disposed thereon, a main screw for simultaneously advancing both of said cutting tools out from or toward the center of the boring block to adjust the diameter of the bore, threaded apertures on said movable sections for cooperating with said main screw tO simultaneously move both of said movable sections, means for retaining said main screw in said center fixed section even when said main screw rotates about its axis, said fixed section comprising a central section, first and second wing sections oppositely disposed from said central section, said moveable sections being shaped to ride on said wing sections and to abut said central section with the smallest diameter of the bore, groove means provided on each of said movable sections, threaded hole means on said wing sections, said threaded hole means being aligned with said groove means, threaded fastener means in said threaded holes passed through said holes to limit the movement of said movable sections, said groove means including shoulder means around the bottom periphery of said groove means, said threaded fastener means having head means which loosely abut said shoulder means to slidingly attach said movable sections to said fixed sections and a keyway provided in each of said wing sections, an aligned keyway in each of said movable sections aligned with the keyway in said wing sections, and a key for each of said aligned keyways to assure linear motion of said movable sections.

Claim 13

An adjustable boring tool comprising a boring block, said boring block having oppositely disposed spaced-apart cutting tools thereon, said boring block comprising a centrally located fixed section, a first and second movable section disposed on opposite sides of said fixed section, a main differential screw for simultaneously advancing both of said cutting tools out from or toward the center of the boring block to adjust the diameter of the bore, means for mounting said cutting tools on said movable sections, threaded holes on said movable sections for receiving opposite ends of said main differential screw to simultaneously move both of said movable sections, a non-threaded hole for enabling said differential screw to pass through said fixed section, said differential screw having a non-threaded portion of smaller diameter than the threaded portions thereof, cammed screw means, an intercepting threaded hole in said fixed section intercepting said non-threaded hole, said cammed screw means having a threaded top portion and a cammed bottom portion, and said cammed bottom portion reaching said non-threaded portion of said differential screw and shaped so that turning said cammed screw moves said main differential screw in said non-threaded hole to position said cutting tools relative to the fixed section.

Claim 14

An adjustable boring tool comprising a boring block, said boring block having oppositely disposed spaced-apart cutting tools thereon, said boring block comprising a centrally located fixed section, a first and second movable section disposed on opposite sides of said fixed section, a main differential screw for simultaneously advancing both of said cutting tools out from or toward the center of the boring block to adjust the diameter of the bore, means for mounting said cutting tools on said movable sections, threaded holes on said movable sections for receiving opposite ends of said main differential screw to simultaneously move both of said movable sections, a non-threaded hole for enabling said differential screw to pass through said fixed section, said differential screw having a non-threaded portion of smaller diameter than the threaded portions thereof, cammed screw means, an intercepting threaded hole in said fixed section intercepting said non-threaded hole, said cammed screw means having a threaded top portion and a cammed bottom portion, and said cammed bottom portion reaching said non-threaded portion of said differential screw and shaped so that turning said cammed screw moves said main differential screw in said non-threaded hole to position said cutting tools relative to the fixed section.

Claim 15

The adjustable boring tool of claim 11, wherein locking screw means are provided to lock said cammed screw at a desired position.

Claim 16

The adjustable boring tool of claim 3 wherein said motion determining means comprises a main differential screw, means in said fixed section for receiving the central part of said main differential screw, said cooperating means comprising transverse threaded holes transversing said moveable sections and positioned to receive opposite ends of said main differential screw, an access opening in at least one of said moveable sections to enable turning said main differential screw while the adjustable boring block is mounted on a boring bar.

Claim 17

An adjustable boring tool comprising a boring block, said boring block having oppositely disposed spaced-apart cutting tools thereon, motion determining means for simultaneously advancing both of said cutting tools out from to toward the center of the boring block to adjust the diameter of the bore, said cutting tool comprising replaceable cutting inserts, beds on said boring block for receving said cutting inserts, means for attaching said beds to said block to enable replacement of said beds, said attaching means comprising side flanges on said beds, groove means on said block for receiving said side flanges, bed screw threaded hole means in said block, and bed screw means acting to pull said beds into contiguous relationship with said block.

Claim 18

An adjustable boring tool comprising a boring block, said boring block having oppositely disposed spaced-apart cutting tools thereon, motion determining means for simultaneously advancing both of said cutting tools out from to toward the center of the boring block to adjust the diameter of the bore, said cutting tool comprising replaceable cutting inserts, beds on said boring block for receving said cutting inserts, means for attaching said beds to said block to enable replacement of said beds, said attaching means comprising side flanges on said beds, groove means on said block for receiving said side flanges, bed screw threaded hole means in said block, and bed screw means acting to pull said beds into contiguous relationship with said block.

Claim 19

The adjustable boring tool of claim 14 wherein said bed screw means comprises bed differential screws, and wherein corresponding threaded holes are provided in said beds.