Circular-shank tool comprising a tool holder
View Patent ↗A circular-shank tool including a shank held in a bore of a tool holder by a locking sleeve, the shank being rotatably held in the locking sleeve. The locking sleeve has one or more retaining elements that project inwards and engage in a peripheral groove in the shank of the tool, thus indisplaceably securing the locking sleeve in an axial direction on the shank of the tool. Because the locking sleeve is mirror-symmetrical to the central transversal plane, the locking sleeve can be fixed to the shank in a position that is rotated through 180°.
1. A round shank chisel ( 30 ) with a shank ( 31 ), wherein the shank ( 31 ) is rotatably maintained in a clamping sleeve ( 10 ), the clamping sleeve ( 10 ) has at least one inwardly projecting holding element ( 16 , 17 , 18 ) which engages a circumferential groove ( 39 ) cut into the shank ( 31 ) of the round shank chisel ( 30 ), the clamping sleeve ( 10 ) is fixed in an axial direction on the shank ( 31 ) of the round shank chisel ( 30 ) so that the clamping sleeve ( 10 ) cannot be shifted, each of the at least one holding element ( 16 , 17 , 18 ) is arranged in a center transverse plane ( 38 ) of the clamping sleeve ( 10 ) or a same axial distance from the center transverse plane ( 38 ), and the clamping sleeve ( 10 ) is attachable to the shank ( 31 ) of the round shank chisel ( 30 ) in two axial positions rotated by 180° around a longitudinal axis ( 19 ), and is selectively fixable in place in one of the two positions, the clamping sleeve comprising:
the holding elements ( 16 , 17 , 18 ) spaced apart by two parallel punched edges ( 20 , 21 ) oriented transversely with respect to the longitudinal axis ( 19 ) of the clamping sleeve ( 10 ) and are inwardly punched or pressed, and
the punched edges ( 20 , 21 ) extend over a portion of a circumference of the clamping sleeve ( 10 ) and have a distance from each other which is equal to or less than a width of the circumferential groove ( 39 ) in the shank ( 31 ) of the round shank chisel ( 30 ).
2. The round shank chisel in accordance with claim 1 , wherein the at least one holding element 16 , 17 , 18 ) is symmetrical with respect to the center transverse plane ( 38 ) of the clamping sleeve ( 10 ).
3. The round shank chisel in accordance with claim 2 , wherein outer edges ( 14 , 15 ) at both front faces ( 12 , 13 ) of the clamping sleeve ( 10 ) are slanted.
4. The round shank chisel in accordance with claim 3 , wherein the slanted outer edges ( 14 , 15 ) of the clamping sleeve ( 10 ) are located at an angle of 10° to 60° with respect to the outer wall of the clamping sleeve ( 10 ).
5. The round shank chisel in accordance with claim 4 , wherein the at least one holding element ( 16 , 17 , 18 ) each forms a coaxial, concave centering section ( 22 ) facing a convex groove bottom of the circumferential groove ( 39 ).
6. The round shank chisel in accordance with claim 5 , wherein the clamping element ( 10 ) has three of the holding elements ( 16 , 17 , 18 ) of which one holding element ( 16 ) is located opposite a slit ( 11 ) in the clamping sleeve ( 10 ), and the other two holding elements ( 17 , 18 ) are each offset with respect to the one holding element ( 16 ) by approximately 100° on a circumference of the clamping sleeve ( 10 ).
7. The round shank chisel in accordance with claim 6 , wherein a width of the circumferential groove ( 39 ) and an associated width of the holding elements ( 16 , 17 , 18 ) is approximately 1/9 to 1/3 of an axial dimension of the clamping sleeve ( 10 ).
8. The round shank chisel in accordance with claim 7 , wherein the concave centering section ( 22 ) of each of the holding elements ( 16 , 17 , 18 ) extends over an angular area of approximately 30° to 50° of a circumference of the clamping sleeve ( 10 ).
9. The round shank chisel in accordance with claim 8 , wherein ends of the concave centering sections ( 22 ) of the holding elements ( 16 , 17 , 18 ) transition via a convex curved portion ( 28 ) into a transition section which makes a transition via a concave curved portion ( 25 ) into an interior wall of the clamping sleeve ( 10 ), and the convex outer sections of the clamping sleeve ( 10 ) located opposite the concave centering sections ( 22 ) transition at ends via a concave curved portion ( 24 ), a transition section and a convex curved portion ( 23 ) into an outer wall of the clamping sleeve ( 10 ).
10. The round shank chisel in accordance with claim 9 , wherein the holding elements ( 16 , 17 , 18 ) are inwardly punched or pressed so far that the convex outer sections located opposite the concave centering sections ( 22 ) are spaced apart from the inner wall of the clamping sleeve ( 10 ), and the depth of the circumferential groove ( 39 ) in the shank ( 31 ) of the round shank chisel ( 30 ) has dimensions so that with the clamping sleeve ( 10 ) braced in a bore ( 41 ) of a chisel holder ( 40 ), the concave centering sections ( 22 ) of the holding elements ( 16 , 17 , 18 ) rest against or are a short distance from the groove bottom of the circumferential groove ( 39 ).
11. The round shank chisel in accordance with claim 8 , wherein the front face ( 12 ) of the clamping sleeve ( 10 ) facing a chisel tip ( 37 ) is spaced apart from a conical introduction section ( 42 ) of the bore ( 41 ) in a chisel holder ( 40 ) which receives a conical shoulder ( 32 ) of a chisel head ( 36 ) or a centering shoulder of a wear disk arranged between the chisel holder ( 40 ) and the chisel head ( 36 ).
12. The round shank chisel in accordance with claim 1 , wherein outer edges ( 14 , 15 ) at both front faces ( 12 , 13 ) of the clamping sleeve ( 10 ) are slanted.
13. The round shank chisel in accordance with claim 12 , wherein the slanted outer edges ( 14 , 15 ) of the clamping sleeve ( 10 ) are located at an angle of 10 ° to 60 ° with respect to the outer wall of the clamping sleeve ( 10 ).
14. The round shank chisel in accordance with claim 1 , wherein the at least one holding element ( 16 , 17 , 18 ) each forms a coaxial, concave centering section ( 22 ) facing a convex groove bottom of the circumferential groove ( 39 ).
15. The round shank chisel in accordance with claim 1 , wherein the clamping element ( 10 ) has three of the holding elements ( 16 , 17 , 18 ) of which one holding element ( 16 ) is located opposite the slit ( 11 ) in the clamping sleeve ( 10 ), and the other two holding elements ( 17 , 18 ) are each offset with respect to the one holding element ( 16 ) by approximately 100° on a circumference of the clamping sleeve ( 10 ).
16. The round shank chisel in accordance with claim 1 , wherein a width of the circumferential groove ( 39 ) and an associated width of the holding elements ( 16 , 17 , 18 ) is approximately 1/9 to ⅓ of an axial dimension of the clamping sleeve ( 10 ).
17. The round shank chisel in accordance with claim 5 , wherein the concave centering section ( 22 ) of each of the holding elements ( 16 , 17 , 18 ) extends over an angular area of approximately 30° to 50° of a circumference of the clamping sleeve ( 10 ).
18. The round shank chisel in accordance with claim 5 , wherein ends of the concave centering sections ( 22 ) of the holding elements ( 16 , 17 , 18 ) transition via a convex curved portion ( 28 ) into a transition section which makes a transition via a concave curved portion ( 25 ) into an interior wall of the clamping sleeve ( 10 ), and the convex outer sections of the clamping sleeve ( 10 ) located opposite the concave centering sections ( 22 ) transition at ends via a concave curved portion ( 24 ), a transition section and a convex curved portion ( 23 ) into an outer wall of the clamping sleeve ( 10 ).
19. The round shank chisel in accordance with claim 5 , wherein the holding elements ( 16 , 17 , 18 ) are inwardly punched or pressed so far that the convex outer sections located opposite the concave centering sections ( 22 ) are spaced apart from the inner wall of the clamping sleeve ( 10 ), and the depth of the circumferential groove ( 39 ) in the shank ( 31 ) of the round shank chisel ( 30 ) has dimensions so that with the clamping sleeve ( 10 ) braced in a bore ( 41 ) of a chisel holder ( 40 ), the concave centering sections ( 22 ) of the holding elements ( 16 , 17 , 18 ) rest against or are a short distance from the groove bottom of the circumferential groove ( 39 ).
20. A clamping sleeve for a shank ( 31 ) of a round shank chisel ( 30 ), comprising:
more than one inwardly projecting holding element ( 16 , 17 , 18 ) which engages a circumferential groove ( 39 ) cut into the shank ( 31 ) of the round shank chisel ( 30 ), wherein the clamping sleeve ( 10 ) is fixed in an axial direction on the shank ( 31 ) of the round shank chisel ( 30 ) so that the clamping sleeve ( 10 ) cannot be shifted, each of the more than one holding element ( 16 , 17 , 18 ) is arranged in a center transverse plane ( 38 ) of the clamping sleeve ( 10 ) or a same axial distance from the center transverse plane ( 38 ), and the clamping sleeve ( 10 ) is attachable to the shank ( 31 ) of the round shank chisel ( 30 ) in two axial positions rotated by 180° around a longitudinal axis ( 19 ), and is selectively fixable in place in one of the two positions;
the more than one holding elements ( 16 , 17 , 18 ) formed between two parallel punched edges ( 20 , 21 ) oriented transversely with respect to the longitudinal axis ( 19 ) of the clamping sleeve ( 10 ) and are inwardly punched or pressed, wherein the punched edges ( 20 , 21 ) extend over a portion of a circumference of the clamping sleeve ( 10 ) and have a distance from each other which is equal to or less than a width of the circumferential groove ( 39 ) in the shank ( 31 ) of the round shank chisel ( 30 ).