Cutting-off tool

Claim 2

In a cutting-off tool having a holder, a cutter carrier arranged detachably on a lateral face of said holder and having a prismatic groove thereon at one end, an exchangeable cutting body of hard metal or the like mounted at said one end of said cutter carrier in said prismatic groove, and a clamping arm supported at one end on the top of said cutting body and at the other end on said cutter carrier under the action of a clamping device, the improvement comprising said clamping arm being adapted to move with respect to said cutter carrier in the longitudinal direction thereof and having at said one end adjacent said cutting body a supporting surface engaging said cutting body, said cutting body being mounted for longitudinal displacement on said cutter carrier and maintained against displacement in the longitudinal direction by said cutter carrier and said supporting surface, said clamping arm having approximately the same length as said cutter carrier and being spaced throughout its length, with the exception of said other end remote from said supporting surface, at a distance from said cutter carrier, and longitudinal adjustable means engaging said other end of said clamping arm for adjusting said clamping arm longitudinally of said holder and cutter carrier, said clamping device including a clamping piece releaseably secured on said holder adjacent said one end and in overlying clamping engagement with said clamping arm above the spaced portions of the clamping arm and cutter carrier, said clamping piece being short relative to said clamping arm and said clamping piece engaging said clamping arm between said supporting surface and said longitudinal adjusting means, said short clamping piece effecting an elastic bending of said clamping arm when tightened but said spacing being maintained, said longitudinal adjustable means including means securing said other end of said clamping arm against movement away from said holder.

Claim 3

The improvement according to claim 1, in which said clamping piece is supported by one of its ends on the top of said clamping arm and by its oTher end on said holder, said clamping piece having a bore for the passage of a clamping screw which extends perpendicularly to the holder.

Claim 4

The improvement according to claim 1, wherein said prismatic groove in said cutter carrier and a thrust surface on said clamping arm engaging the top of said cutting body are inclined approximately at the positive rake angle.

Claim 5

In a cutting-off tool having a holder, a cutter carrier arranged detachably on a lateral face of said holder and having a prismatic groove thereon at one end, an exchangeable cutting body of hard metal or the like mounted at said one end of said cutter carrier in said prismatic groove, and a clamping arm supported at one end on the top of said cutting body and at the other end on said cutter carrier under the action of a clamping device, the improvement comprising said clamping arm being adapted to move with respect to said cutter carrier in the longitudinal direction thereof and has at said one end adjacent said cutting body a supporting surface engaging said cutting body, said cutting body being mounted for longitudinal displacement on said cutter carrier and maintained against displacement in the longitudinal direction by said cutter carrier and said supporting surface, said clamping arm having approximately the same length as said cutter carrier and is spaced throughout its length, with the exception of said other end remote from said supporting surface, at a distance from said cutter carrier, and a longitudinal adjustable means engaging said other end of said clamping arm for adjusting said clamping arm in said longitudinal direction of said holder, wherein said longitudinal adjustable means comprises a supporting body which is adjustable longitudinally of said holder by means of a longitudinally extending setscrew, wherein said setscrew can be screwed into a threaded hole provided at the rear end of the holder and that in front of the screw there is arranged a cylindrical slider in which a supporting screw is mounted at right angles to the axis of said slider, the threaded part of the supporting screw extending through a longitudinal slot in the holder and the clamping arm being supported on the shank of said screw to thereby define said clamping device, while a compression spring is arranged between the inner end of the slider and the end of the threaded hole.

Claim 6

In a cutting-off tool having a holder, a cutter carrier arranged detachably on a lateral face of said holder and having a prismatic groove thereon at one end, an exchangeable cutting body of hard metal or the like mounted at said one end of said cutter carrier in said prismatic groove, and a clamping arm supported at one end on the top of said cutting body and at the other end on said cutter carrier under the action of a clamping device, the improvement comprising said clamping arm being adapted to move with respect to said cutter carrier in the longitudinal direction thereof and has at said one end adjacent said cutting body a supporting surface engaging said cutting body, said cutting body being mounted for longitudinal displacement on said cutter carrier and maintained against displacement in the longitudinal direction by said cutter carrier and said supporting surface, said clamping arm having approximately the same length as said cutter carrier and is spaced throughout its length, with the exception of said other end remote from said supporting surface, at a distance from said cutter carrier, and a longitudinal adjustable means engaging said other end of said clamping arm for adjusting said clamping arm in said longitudinal direction of said holder, wherein said longitudinal adjustable means comprises a supporting body which is adjustable longitudinally of said holder by means of a longitudinally extending setscrew, wherein said setscrew can be screwed into a threaded hole provided at the rear end of the holder and that in front of the screw there is arranged a cylindrical slider in which a supporting screw is mounted at right angles to the axis of said slider, the threaded part of the supporting screw extending through a longitudinal slot in the holder and the clamping arm being supported on the shank of said screw to thereby define said clamping device, while a compression spring is arranged between the inner end of the slider and the end of the threaded hole.

Claim 7

The improvement according to claim 4, wherein said supporting screw has a flange resting against the lateral surface of the clamping arm.

Claim 8

The improvement according to claim 1, wherein said cutter carrier has a fitting tongue extending in the longitudinal direction on its lateral surface facing the holder, said tongue being integral with the cutter carrier, and said holder having a corresponding groove for receiving said tongue.

Claim 9

The improvement according to claim 6, wherein said fitting tongue is provided with threaded holes for the engagement of fixing screws arranged in the holder.

Claim 10

The improvement according to claim 1, wherein the holder is of angular cross-section, the horizontal limb serving to clamp the holder and the vertical limb serving for reception and abutment of the cutter carrier and the clamping arm.

Claim 11

The improvement according to claim 1, including a projection on the top of said cutting body of which the front faces the cutting edge, extends obliquely with respect to a raked surface and is formed as a chip deflector, the back of the projection being approximately vertically with respect to the top surface of said cutting body and engaged by the supporting surface of the clamping arm.

Claim 12

The improvement according to claim 1, wherein said longitudinal adjustable means comprises a supporting body which is adjustable longitudinally of said holder by means of a longitudinally extending set screw.

Claim 13

In a cutting-off tool having a holder, a cutter carrier arranged detachably on a lateral face of said holder and having a prismatic groove thereon at one end, an exchangeable cutting body of haRd metal or the like mounted at said one end of said cutter carrier in said prismatic groove, and a clamping arm supported at one end on the top of said cutting body and at the other end on said cutter carrier under the action of a clamping device, the improvement comprising said clamping arm being adapted to move with respect to said cutter carrier in the longitudinal direction thereof and has at said one end adjacent said cutting body a supporting surface engaging said cutting body, said cutting body being mounted for longitudinal displacement on said cutter carrier and maintained against displacement in the longitudinal direction by said cutter carrier and said supporting surface, said clamping arm having approximately the same length as said cutter carrier and is spaced throughout its length, with the exception of said other end remote from said supporting surface, at a distance from said cutter carrier, and longitudinal adjustable means engaging said other end of said clamping arm for adjusting said clamping arm in said longitudinal direction of said holder, a clamping piece on said holder adjacent said one end extending transversely of said clamping arm and which is supported by one of its ends on the top of said clamping arm and by its other end on said holder, said clamping piece having a bore for the passage of a clamping screw which extends perpendicularly to the holder, wherein said one end of said clamping piece has an inclined thrust surface which is supported on an oblique top narrow side of said clamping arm rising towards the holder, wherein said prismatic groove in said cutter carrier and a thrust surface on said clamping arm engaging the top of said cutting body are inclined approximately at the positive rake angle ( gamma ), and, wherein said top narrow side of said clamping arm cooperating with said clamping piece is inclined at about the same angle as, or a somewhat smaller angle ( Alpha ) than, said prismatic groove, so that on a forward displacement of said clamping arm, said top narrow side always remains in approximately the same height and angular position in the region of the clamping piece.

Claim 14

In a cutting-off tool having a holder, a cutter carrier arranged detachably on a lateral face of said holder and having a prismatic groove thereon at one end, an exchangeable cutting body of haRd metal or the like mounted at said one end of said cutter carrier in said prismatic groove, and a clamping arm supported at one end on the top of said cutting body and at the other end on said cutter carrier under the action of a clamping device, the improvement comprising said clamping arm being adapted to move with respect to said cutter carrier in the longitudinal direction thereof and has at said one end adjacent said cutting body a supporting surface engaging said cutting body, said cutting body being mounted for longitudinal displacement on said cutter carrier and maintained against displacement in the longitudinal direction by said cutter carrier and said supporting surface, said clamping arm having approximately the same length as said cutter carrier and is spaced throughout its length, with the exception of said other end remote from said supporting surface, at a distance from said cutter carrier, and longitudinal adjustable means engaging said other end of said clamping arm for adjusting said clamping arm in said longitudinal direction of said holder, a clamping piece on said holder adjacent said one end extending transversely of said clamping arm and which is supported by one of its ends on the top of said clamping arm and by its other end on said holder, said clamping piece having a bore for the passage of a clamping screw which extends perpendicularly to the holder, wherein said one end of said clamping piece has an inclined thrust surface which is supported on an oblique top narrow side of said clamping arm rising towards the holder, wherein said prismatic groove in said cutter carrier and a thrust surface on said clamping arm engaging the top of said cutting body are inclined approximately at the positive rake angle ( gamma ), and, wherein said top narrow side of said clamping arm cooperating with said clamping piece is inclined at about the same angle as, or a somewhat smaller angle ( Alpha ) than, said prismatic groove, so that on a forward displacement of said clamping arm, said top narrow side always remains in approximately the same height and angular position in the region of the clamping piece.

Claim 15

In a cutting-off tool having a holder, a cutter carrier arranged detachably on a lateral face of said holder and having a prismatic groove thereon at one end, an exchangeable cutting body of hard metal or the like mounted at said one end of said cutter carrier in said prismatic groove, and a clamping arm supported at one end on the top of said cutting body and at the other end on said cutter carrier under the action of a clamping device, the improvement comprising said clamping arm being adapted to move with respect to said cutter carrier in the longitudinal direction thereof and has at said one end adjacent said cutting body a supporting surface engaging said cutting body, said cutting body being mounted for longitudinal displacement on said cutter carrier and maintained against displacement in the longitudinal direction by said cutter carrier and said supporting surface, said clamping arm having approximately the same length as said cutter carrier and is spaced throughout its length, with the exception of said other end remote from said supporting surface, at a distance from said cutter carrier, and longitudinal adjustable means engaging said other end of said clamping arm for adjusting said clamping arm in said longitudinal direction of said holder, wherein said cutter carrier has a fitting tongue extending in the longitudinal direction on its lateral surface facing the holder, said tongue being integral with the cutter carrier, and said holder having a corresponding groove for receiving said tongue and wherein said bottom side of the cutter carrier is flush with the underside of the holder.

Claim 16

In a cutting-off tool having a holder, a cutter carrier arranged detachably on a lateral face of said holder and having a prismatic groove thereon at one end, an exchangeable cutting body of hard metal or the like mounted at said one end of said cutter carrier in said prismatic groove, and a clamping arm supported at one end on the top of said cutting body and at the other end on said cutter carrier under the action of a clamping device, the improvement comprising said clamping arm being adapted to move with respect to said cutter carrier in the longitudinal direction thereof and has at said one end adjacent said cutting body a supporting surface engaging said cutting body, said cutting body being mounted for longitudinal displacement on said cutter carrier and maintained against displacement in the longitudinal direction by said cutter carrier and said supporting surface, said clamping arm having approximately the same length as said cutter carrier and is spaced throughout its length, with the exception of said other end remote from said supporting surface, at a distance from said cutter carrier, and longitudinal adjustable means engaging said other end of said clamping arm for adjusting said clamping arm in said longitudinal direction of said holder, wherein said cutter carrier has a fitting tongue extending in the longitudinal direction on its lateral surface facing the holder, said tongue being integral with the cutter carrier, and said holder having a corresponding groove for receiving said tongue and wherein said bottom side of the cutter carrier is flush with the underside of the holder.