Power tool

Patent metadata

Field	Value
Publication number	US-2019168372-A1
Application number	US-201816193860-A
Country	US
Kind code	A1
Filing date	Nov 16, 2018
Priority date	Dec 1, 2017
Publication date	Jun 6, 2019
Grant date	—

Abstract

A power tool includes a motor having an output shaft rotatable around a first axis, a spindle rotatably supported around a second axis, a transmitting mechanism configured to reciprocally rotate the spindle within a specified angle range around the second axis, an elongate support body supporting the motor, the spindle and the transmitting mechanism, an elongate housing that houses the support body, and a first elastic member interposed between the housing and a first end part of the support body and connecting the housing and the support body so as to be movable relative to each other. The spindle is supported in the first end part such that the second axis crosses the direction of a longitudinal axis of the support body. The support body has a weight provided to increase an inertia moment of the support body around the second axis.

First claim

What is claimed is:

1 . A power tool configured to oscillatory drive a tool accessory, the power tool comprising:
a motor having an output shaft, the output shaft being rotatable around a first axis; a spindle configured to removably receive the tool accessory and rotatably supported around a second axis; a transmitting mechanism configured to transmit rotation of the output shaft to the spindle and reciprocally rotate the spindle within a specified angle range around the second axis; an elongate support body having a longitudinal axis and supporting the motor, the spindle and the transmitting mechanism; an elongate housing that houses the support body; and a first elastic member interposed between the housing and a first end part of the support body and connecting the housing and the support body so as to be movable relative to each other, the first end part forming an end part of the support body in a direction of the longitudinal axis, wherein: the spindle is supported in the first end part such that the second axis crosses the direction of the longitudinal axis, and the support body has a weight provided to increase an inertia moment of the support body around the second axis.

2 . The power tool as defined in claim 1 , wherein:
the support body includes a weight-mounting part to which the weight is mounted, and the weight is made of a material having a higher density than at least the weight-mounting part.

3 . The power tool as defined in claim 1 , wherein:
the housing includes a grip part configured to be held by a user, the support body includes an extending part integrally formed with the first end part, the extending part extending from the first end part in the direction of the longitudinal axis, corresponding to at least a portion of the grip part, and the weight is provided to the extending part.

4 . The power tool as defined in claim 3 , wherein:
the second axis is orthogonal to the direction of the longitudinal axis of the support body, when an extending direction of the second axis is defined as an up-down direction, the direction of the longitudinal axis of the support body is defined as a front-rear direction, and a direction orthogonal to the front-rear direction and the up-down direction is defined as a left-right direction, at least the extending part includes a left part and a right part connected together to form the extending part, and the weight is fixed to the extending part in a state in which the weight is held between the left part and the right part.

5 . The power tool as defined in claim 3 , wherein:
the support body includes:
a second end part forming another end part on an opposite side to the first end part in the direction of the longitudinal axis; and
a plurality of second elastic members spaced apart from each other in a circumferential direction around the longitudinal axis, the plurality of second elastic members connecting the extending part and the second end part so as to be movable relative to each other,
the second end part has a power-source-related device, the power-source-related device being configured to enable power supply from a power source to the motor, and at least a portion of the weight is disposed within an internal space surrounded by the plurality of second elastic members.

6 . The power tool as defined in claim 1 , wherein:
the first axis and the second axis extend in parallel to each other, and the motor and the transmitting mechanism are supported by the first end part.

7 . A power tool configured to oscillatory drive one of plural kinds of tool accessories selectively mounted thereto, the power tool comprising:
a brushless motor having an output shaft, the output shaft being rotatable around a first axis; a spindle configured to removably receive a tool accessory and rotatably supported around a second axis, the second axis extending in parallel to the first axis; a transmitting mechanism configured to transmit rotation of the output shaft to the spindle and reciprocally rotate the spindle within a specified angle range around the second axis; an elongate support body having a longitudinal axis and supporting the brushless motor, the spindle and the transmitting mechanism; an elongate housing that houses the support body; and an elastic member interposed between the housing and a first end part of the support body and connecting the housing and the support body so as to be movable relative to each other, the first end part forming an end part of the support body in a direction of the longitudinal axis, wherein: the brushless motor, the spindle and the transmitting mechanism are supported in the first end part such that the first axis and the second axis cross the direction of the longitudinal axis, an inertia moment of the support body around the second axis, the support body supporting the brushless motor, the spindle and the transmitting mechanism, is at least 20 times of an inertia moment of a tool accessory around the second axis, when the tool accessory having a largest mass among the plural kinds of the tool accessories is mounted to the spindle.

8 . The power tool as defined in claim 7 , wherein the inertia moment of the support body around the second axis is not less than 25 times and not more than 35 times of the inertia moment of the tool accessory around the second axis.

Assignees

• Makita Corp

Inventors

• Aoki Yonosuke

Classifications

• B25F5/006 Primary

  Vibration damping means · CPC title

• B23D51/02

  of beds; of guiding arrangements for work-tables or saw carriers; of frames · CPC title

• B24B23/04 Primary

  with oscillating grinding tools; Accessories therefor · CPC title

• B23D61/006

  Oscillating saw blades · CPC title

• B25F3/00

  Associations of tools for different working operations with one portable power-drive means; Adapters therefor · CPC title