Tool holder
AssigneeBig Daishow A Seiki Co Ltd
InventorMasayuki Doi
Life of this patent
Estimating the term…
Abstract
Provided is a holder device that uses a pressure medium suitable for gripping a long and thin grasped object, the device eliminating need for a small-diameter machining for a device body and allowing use of a material suitable for sleeve deformation at a portion where a pressure chamber is formed. A holder device capable of deforming in a radial direction for fastening a grasped object 7 through a function of a pressure medium, includes a device body 2, a sleeve 3 disposed at a leading end of the device body 2 for gripping the grasped object 7, a pressure chamber 8 formed circumferentially in the sleeve 3, and a support portion 9 provided continuously from the device body 2 for forming the pressure chamber 8 together with the sleeve 3.
Claims9
A tool holder having a chuck section that grasps an cutting tool at a leading side and a shank section that is at a trailing side of the tool holder, comprising:
- a holder body that is composed with a main body and a distal extending portion (2A), the main body having an annular shape, the distal extending portion extending in the rotation axis from a leading edge face of the main body;
- a sleeve, which has an annular shape and is a physically separated part from the holder body, disposed at the leading side of the holder body and capable of deforming in a radial direction with respect to the rotational axis for grasping the grasped cutting tool through an action of a pressure medium, the sleeve having a trailing portion that is at the trailing side and that is inserted inside the distal extending portion in a predetermined length in order to be secured therein;
- a support portion, which has an annular shape and is a physically separated part from the holder body and the sleeve, disposed over the sleeve in the radial direction such that a contacting portion with the sleeve is at the leading side and distant from the distal extending portion of the holder body in the rotational axis;
- and
- a pressure chamber provided circumferentially between the support portion and the sleeve, wherein
- the main body of the holder body includes a pressure guide passageway for transmitting a pressure through the pressure medium to the pressure chamber,
- a pressure-medium storage space has an annular shape and is formed in a space sandwiched in the rotational axis by a part of the holder body, which faces the leading side, and a part of the support part, which faces the trailing side, the pressure-medium storage space positioning between the pressure guide passageway and the pressure chamber in the rotational axis,
- a communication passageway, which has an annular shape around the rotation axis and through which the pressure medium commutes, is formed to annularly connect the pressure-medium storage space with the pressure chamber,
- the communication passageway is located outer than the pressure chamber in the radius direction,
- a section in the rotational axis where the distal extending portion exists is defined as a distal section (DS), and
- the distal extending portion of the holder body, the sleeve and the support portion are layered in the radial direction within the distal section.
A tool holder having a chuck section that grasps an cutting tool at a leading side and a shank section that is at a trailing side of the tool holder, comprising:
- a holder body that is composed with a main body and a distal extending portion (2A), the main body having an annular shape, the distal extending portion extending in the rotation axis from a leading edge face of the main body;
- a sleeve, which has an annular shape and is a physically separated part from the holder body, disposed at the leading side of the holder body and capable of deforming in a radial direction with respect to the rotational axis for grasping the grasped cutting tool through an action of a pressure medium, the sleeve having a trailing portion that is at the trailing side and that is inserted inside the distal extending portion in a predetermined length in order to be secured therein;
- a support portion, which has an annular shape and is a physically separated part from the holder body and the sleeve, disposed over the sleeve in the radial direction such that a contacting portion with the sleeve is at the leading side and distant from the distal extending portion of the holder body in the rotational axis;
- and
- a pressure chamber provided circumferentially between the support portion and the sleeve, wherein
- the main body of the holder body includes a pressure guide passageway for transmitting a pressure through the pressure medium to the pressure chamber,
- a pressure-medium storage space has an annular shape and is formed in a space sandwiched in the rotational axis by a part of the holder body, which faces the leading side, and a part of the support part, which faces the trailing side, the pressure-medium storage space positioning between the pressure guide passageway and the pressure chamber in the rotational axis,
- a communication passageway, which has an annular shape around the rotation axis and through which the pressure medium commutes, is formed to annularly connect the pressure-medium storage space with the pressure chamber,
- a section in the rotational axis where the distal extending portion exists is defined as a distal section (DS),
- the distal extending portion of the holder body, the sleeve and the support portion are layered in the radial direction within the distal section, and
- the sleeve, the support portion and the distal extending portion are accumulated in this order in the radial direction from the rotational axis.
Dependencies are inferred from the claim text.