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It is an object of the invention to provide a technique for bringing a center of gravity of a battery-powered power tool closer to a working axis of a tool bit in the battery-powered power tool. The battery-powered power tool performs an operation by movement of a tool bit 119 in an axial direction

It is an object of the invention to provide a technique for bringing a center of gravity of a battery-powered power tool closer to a working axis of a tool bit in the battery-powered power tool. The battery-powered power tool performs an operation by movement of a tool bit 119 in an axial direction of the tool bit. The power tool includes a battery 110, a motor 111 that is driven by power supply from the battery 110, a mechanical arrangement 113, 115, 117 that drives the tool bit 119 by rotative power transmitted from the motor 111, and a tool body 103 that houses the motor 111 and the mechanical arrangement 113, 115, 117 and has a front end region in which the tool bit 119 is disposed. A sum of weights of the motor 111 and the battery 110 is smaller than a weight of the mechanical arrangement 113, 115, 117.

대표청구항 ▼

1. A battery-powered power tool that performs an operation by movement of a tool bit in an axial direction of the tool bit, including: a battery,a motor that is driven by power supply from the battery,a mechanical arrangement including a motion converting mechanism, a striking mechanism, and a power

1. A battery-powered power tool that performs an operation by movement of a tool bit in an axial direction of the tool bit, including: a battery,a motor that is driven by power supply from the battery,a mechanical arrangement including a motion converting mechanism, a striking mechanism, and a power transmitting mechanism, the mechanical arrangement driving the tool bit by rotative power transmitted from the motor, anda tool body that houses the motor and the mechanical arrangement and has a front end region in which the tool bit is disposed, wherein: the entire motor is disposed not to intersect a central longitudinal axis of the tool bit,a sum of weights of the motor and the battery is smaller than a weight of the mechanical arrangement, andthe motion converting mechanism includes a swinging ring and an intermediate shaft that is disposed between the motor and the longitudinal axis of the tool bit. 2. The battery-powered power tool as defined in claim 1, wherein the tool bit is defined by a hammer bit that moves at least linearly in the axial direction, and the mechanical arrangement includes a striking element that moves linearly in the axial direction of the hammer bit and strikes the hammer bit. 3. The battery-powered power tool as defined in claim 1, further comprising a grip that is disposed on a side of the mechanical arrangement opposite from the tool bit and provided to be held by a user, wherein at least part of the grip is located in a rear region on the longitudinal axis of the tool bit. 4. The battery-powered power tool as defined in claim 1, wherein the motor is disposed such that an axis of rotation of the motor obliquely crosses the longitudinal axis of the tool bit. 5. The battery-powered power tool as defined in claim 1, further comprising a grip that is disposed on a side of the mechanical arrangement opposite from the tool bit and designed to be held by the user, wherein the grip extends in a direction transverse to the axial direction of the tool bit and the battery is mounted to one end of the grip in an extending direction, wherein a central axis of the grip is located on the tool bit side of a central axis of the battery. 6. The battery-powered power tool as defined in claim 1, wherein the motor comprises a DC brushless motor. 7. The battery-powered power tool as defined in claim 1, wherein the battery comprises a lithium-ion battery. 8. The battery-powered power tool as defined in claim 1, wherein a weight ratio of the battery and motor to the mechanical arrangement is 0.9 to less than 1. 9. The battery-powered power tool as defined in claim 1, wherein the intermediate shaft is parallel to the longitudinal axis of the tool bit. 10. The battery-powered power tool as defined in claim 9, wherein the motor is disposed such that an axis of rotation of the motor obliquely crosses both the longitudinal axis of the tool bit and the intermediate shaft.