It is an object of the invention to reduce transmission of an external force caused by run-out of a tool bit to a tool body in a power tool is provided. A representative power tool which performs a predetermined operation by linear motion of a tool bit in its axial direction has a tool body, a tool
It is an object of the invention to reduce transmission of an external force caused by run-out of a tool bit to a tool body in a power tool is provided. A representative power tool which performs a predetermined operation by linear motion of a tool bit in its axial direction has a tool body, a tool holder that holds the tool bit in its front end region and extends in the axial direction of the tool bit, and an elastic element. A rear region of the tool holder opposite from the front end region extends into the tool body, and in the extending region, the tool holder is coupled to the tool body such that the tool holder can rotate about a pivot on a z-axis defined by an axis of the tool bit, in directions of y- and x-axes which intersect with the z-axis. The elastic element applies a biasing force to the tool holder in such a manner as to hold the tool holder in a predetermined position or an initial position with respect to the tool body.
대표청구항▼
1. A power tool which performs an operation by linear motion of a tool bit in an axial direction comprising: a tool body,a tool holder that holds the tool bit in the front end region of the tool holder and extends in the axial direction of the tool bit,an elastic element,a motor,a striking element t
1. A power tool which performs an operation by linear motion of a tool bit in an axial direction comprising: a tool body,a tool holder that holds the tool bit in the front end region of the tool holder and extends in the axial direction of the tool bit,an elastic element,a motor,a striking element that is linearly driven in the axial direction of the tool bit by the motor, andan intermediate element that is housed within the tool holder such that it can slide in the axial direction of the tool bit and serves to transmit linear motion of the striking element to the tool bit,wherein a rear region of the tool holder opposite from the front end region extends into the tool body, and in the extending region into the tool body, the tool holder is coupled to the tool body such that the tool holder can rotate about a pivot on a z-axis defined by a longitudinal axis of the tool bit, in directions of y- and x-axes, the y- and x-axes forming a plane perpendicular to the z-axis,wherein the elastic element applies a biasing force to the tool holder in such a manner as to hold the tool holder in an initial position with respect to the tool body,wherein the tool bit is designed as a hammer bit which performs a hammering operation by applying a linear striking force to a workpiece, the power tool further comprising a second elastic element that is disposed between the tool body and the intermediate element and applies a biasing force to the intermediate element in such a manner as to hold the intermediate element in an initial position, andwherein the intermediate element is coupled to the tool body via a second spherical connection which is formed by a convex spherical surface centered on a pivot on the z-axis and a concave spherical surface which conforms to the convex spherical surface. 2. The power tool as defined in claim 1, wherein the tool holder is coupled to the tool body via a spherical connection which is formed by a convex spherical surface centered on a pivot on the z-axis and a concave spherical surface which conforms to the convex spherical surface. 3. The power tool as defined in claim 1, wherein the tool body has a cylindrical tool holder receiving part that receives the extending region of the tool holder extending into the tool body, the power tool further comprising: a slide member that is disposed on the outside of the tool holder receiving part and can move in the axial direction of the tool bit,a plurality of ball holding holes that are formed in the tool holder receiving part at intervals in a circumferential direction and radially extend through the tool holder receiving part, andballs that are loosely fitted in the ball holding holes and disposed between the slide member and the tool holder,wherein the elastic element is disposed between the tool body and the slide member, and the biasing force of the elastic element is transmitted from the slide member to the tool holder via the balls. 4. The power tool as defined in claim 1, wherein a sealing elastic element is disposed between the tool body and the tool holder and prevents leakage of lubricant sealed in an inner space of the tool body, and the biasing force of the sealing elastic element is applied to the tool holder in such a manner as to hold the tool holder in the initial position. 5. A power tool for performing a hammer drill operation in which a tool bit applies a linear striking force in an axial direction and a rotational force around its axis to a workpiece, comprising: a tool body,a motor,a tool holder that holds the tool bit in its front end region and extends in the axial direction of the tool bit,an elastic element,a striking element that is linearly driven by the motor and causes the tool bit to perform linear striking motion,an intermediate element that is housed within the tool holder such that it can slide in the axial direction of the tool bit and serves to transmit linear motion of the striking element to the tool bit, anda cylindrical rotating member that is mounted to the tool body such that it can rotate about the axis of the tool bit and rotationally driven by the motor, wherein:a rear region of the tool holder opposite from the front end region extends into the cylindrical rotating member, and in the extending region into the cylindrical rotating member, the tool holder is coupled to the cylindrical rotating member such that it can rotate about a pivot on a z-axis defined by a longitudinal axis of the tool bit, in directions of y- and x-axes, the y- and x-axes forming a plane perpendicular to the z-axis, while rotating together with the cylindrical rotating member about the axis of the tool bit,wherein the elastic element applies a biasing force to the tool holder in such a manner as to hold the tool holder in an initial position with respect to the tool body,wherein the tool bit is designed as a hammer bit which performs a hammering operation by applying a linear striking force to a workpiece, the power tool further comprising a second elastic element that is disposed between the tool body and the intermediate element and applies a biasing force to the intermediate element in such a manner as to hold the intermediate element in an initial position, andwherein the intermediate element is coupled to the tool body via a second spherical connection which is formed by a convex spherical surface centered on a pivot on the z-axis and a concave spherical surface which conforms to the convex spherical surface. 6. The power tool as defined in claim 5, wherein the cylindrical rotating member has a cylindrical tool holder receiving part which receives the extending region of the tool holder extending into the cylindrical rotating member, the power tool further comprising: a slide member that is disposed on the outside of the tool holder receiving part and can move in the axial direction of the tool bit,a plurality of ball holding holes that are formed in the tool holder receiving part at intervals in a circumferential direction and radially extend through the tool holder receiving part, andballs that are loosely fitted in the ball holding holes and disposed between the slide member and the tool holder,wherein the balls serve not only as a biasing force transmitting member which transmits the biasing force of the elastic element to the tool holder such that the tool holder is held in the initial position, but also as a torque transmitting member which transmits a rotational force of the cylindrical rotating member to the tool holder. 7. The power tool as defined in claim 2, wherein the tool body has a cylindrical tool holder receiving part that receives the extending region of the tool holder extending into the tool body, the power tool further comprising: a slide member that is disposed on the outside of the tool holder receiving part and can move in the axial direction of the tool bit,a plurality of ball holding holes that are formed in the tool holder receiving part at intervals in a circumferential direction and radially extend through the tool holder receiving part, andballs that are loosely fitted in the ball holding holes and disposed between the slide member and the tool holder,wherein the elastic element is disposed between the tool body and the slide member, and the biasing force of the elastic element is transmitted from the slide member to the tool holder via the balls. 8. The power tool as defined in claim 2, wherein a sealing elastic element is disposed between the tool body and the tool holder and prevents leakage of lubricant sealed in an inner space of the tool body, and the biasing force of the sealing elastic element is applied to the tool holder in such a manner as to hold the tool holder in the initial position. 9. The power tool as defined in claim 3, wherein a sealing elastic element is disposed between the tool body and the tool holder and prevents leakage of lubricant sealed in an inner space of the tool body, and the biasing force of the sealing elastic element is applied to the tool holder in such a manner as to hold the tool holder in the initial position. 10. The power tool as defined in claim 1, wherein the intermediate element further comprises a protruding part that protrudes rearward from a bore of the tool holder. 11. The power tool as defined in claim 1, wherein the intermediate element further comprises a rear shoulder portion that moves rearward. 12. The power tool as defined in claim 5, wherein the intermediate element further comprises a protruding part that protrudes rearward from a bore of the tool holder. 13. The power tool as defined in claim 5, wherein the intermediate element further comprises a rear shoulder portion that moves rearward.
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