# US 2019/0168372 A1 · Power tool

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2019/0168372 A1
- Document ID: US20190168372A1
- Status: Published application
- Kind: A1
- Application number: 16/193,860
- Filed: 2018-11-16
- Published: 2019-06-06
- Earliest claimed: 2017-12-01
- Assignees: Makita Corporation
- Applicants: Makita Corporation
- Inventors: Yonosuke AOKI
- Web page: https://patentgrep.com/patent/US20190168372A1

## CPC

- B25F 5/006: {Vibration damping means}
- B23D 51/02: of beds; of guiding arrangements for work-tables or saw carriers; of frames
- B24B 23/04: with oscillating grinding tools; Accessories therefor
- B25F 3/00: Associations of tools for different working operations with one portable power-drive means; Adapters therefor
- B25F 5/02: Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)}
- B27B 19/006: {with oscillating saw blades; Hand saws with oscillating saw blades}
- B23D 61/006: {Oscillating saw blades}
- B25F: COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR {(machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass B23P23/00 and subgroups)}
- B23D: PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR (making toothed gears or the like B23F; cutting metal by applying heat locally B23K; arrangements for copying or controlling B23Q)
- B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B27B: SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR (saws specially adapted for pruning or debranching A01G3/08; sawing apparatus specially adapted for felling trees A01G23/091; features not restricted to a particular type of wood saw B23D, e.g. attaching saw blades B23D51/00; machine tool frames, beds, pillars or like members, in general B23Q1/01)

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 3)

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.

### Claim 5 (depends on 3)

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.

### Claim 6 (depends on 1)

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.

### Claim 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.

### Claim 8 (depends on 7)

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.