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US 12,589,439 B2Granted
Tool holder and tool holding structure including the same
AssigneeNikken Kosakusho Works Ltd.
InventorsSusumu Mikado, Eisaku Nakai, Stephen Eckersall
Life of this patent
Estimating the term…
Abstract
A tool holder includes a holder body, a tapered collet, a first side lock bolt, a second side lock bolt, and a key. The key fits in a keyway of the collet, contacts the inner peripheral surface of a front hole, and contacts a recess formed in a rear end portion of a cutting tool inserted into a tool insertion hole of the collet.
Claims8
A tool holder for fixing and grasping a cutting tool having a shank with a side lock recess, the tool holder comprising:
- a holder body including a rear hole, a middle hole, a front hole, a first through hole, and a second through hole, the rear hole extending from a rear end of the holder body forward in an axial direction, the middle hole being connected to a front end of the rear hole and extending forward in the axial direction, the front hole being a tapered hole connected to a front end of the middle hole and extending forward in the axial direction with an inner diameter of the tapered hole gradually increasing toward a distal end of the holder body, the first through hole extending perpendicularly to the axial direction from an outer peripheral surface of the holder body to an inner peripheral surface of the middle hole, and the second through hole being located at a different position in a circumferential direction from the first through hole and extending from the outer peripheral surface of the holder body to the inner peripheral surface of the middle hole so as to be tilted with respect to the axial direction;
- a tapered collet that is detachably inserted into the middle hole and the front hole, that includes a tool insertion hole in a distal end region of the collet, and in which an outer diameter of an outer peripheral surface of the collet gradually increases toward a distal end of the collet, the collet including a keyway, a first flat portion, and a second flat portion, the keyway extending from the outer peripheral surface of the tapered collet to the tool insertion hole, the first flat portion being a flat cut in the outer peripheral surface of the collet and located at a position facing the first through hole, and the second flat portion being a flat cut in the outer peripheral surface of the collet that is tilted with respect to the axial direction and being located at a position facing the second through hole;
- a first side lock bolt that passes through the first through hole and whose distal end contacts the first flat portion of the collet;
- a second side lock bolt that passes through the second through hole and whose distal end contacts the second flat portion of the collet;
- and
- a key that fits in the keyway of the collet, contacts an inner peripheral surface of the front hole, and contacts the side lock recess of the cutting tool inserted into the tool insertion hole.
3 more elements
A tool holding structure, comprising:
- a cutting tool having a shank with a side lock recess;
- and
- a tool holder comprising:
- a holder body including a rear hole, a middle hole, a front hole, a first through hole, and a second through hole, the rear hole extending from a rear end of the holder body forward in an axial direction, the middle hole being connected to a front end of the rear hole and extending forward in the axial direction, the front hole being a tapered hole connected to a front end of the middle hole and extending forward in the axial direction with an inner diameter of the tapered hole gradually increasing toward a distal end of the holder body, the first through hole extending perpendicularly to the axial direction from an outer peripheral surface of the holder body to an inner peripheral surface of the middle hole, and the second through hole being located at a different position in a circumferential direction from the first through hole and extending from the outer peripheral surface of the holder body to the inner peripheral surface of the middle hole so as to be tilted with respect to the axial direction;
- a tapered collet that is detachably inserted into the middle hole and the front hole, that includes a tool insertion hole in a distal end region of the collet, and in which an outer diameter of an outer peripheral surface of the collet gradually increases toward a distal end of the collet, the collet including a keyway, a first flat portion, and a second flat portion, the keyway extending from the outer peripheral surface of the tapered collet to the tool insertion hole, the first flat portion being a flat cut in the outer peripheral surface of the collet and located at a position facing the first through hole, and the second flat portion being a flat cut in the outer peripheral surface of the collet that is tilted with respect to the axial direction and being located at a position facing the second through hole;
- a first side lock bolt that passes through the first through hole and whose distal end contacts the first flat portion of the collet;
- a second side lock bolt that passes through the second through hole and whose distal end contacts the second flat portion of the collet;
- and
- a key that fits in the keyway of the collet, contacts an inner peripheral surface of the front hole, and contacts the side lock recess of the cutting tool in a state in which the cutting tool is inserted into the tool insertion hole,
- wherein
- the cutting tool is inserted into the tool insertion hole of the collet, and
- the side lock recess is located at a position facing the keyway of the collet and into which the key fits.
9 more elements
Dependencies are inferred from the claim text.