Power tool

Patent metadata

Field	Value
Publication number	US-2016136801-A1
Application number	US-201514936154-A
Country	US
Kind code	A1
Filing date	Nov 9, 2015
Priority date	Nov 14, 2014
Publication date	May 19, 2016
Grant date	—

Abstract

A power tool includes a motor, a driving mechanism, a body housing, a handle, and a rear position defining member. The driving mechanism is driven by the motor and configured to drive a tool bit in a longitudinal direction. The body housing houses the motor and the driving mechanism. The handle is connected to the body housing so as to be allowed to move with respect to the body housing between a front position and a rear position in the longitudinal direction, while being biased by a biasing member in the longitudinal direction. The handle includes a handle base and a handle cover. The rear position defining member extends from the body housing to a position between the handle base and the handle cover in the longitudinal direction and is configured to define a rear position of the handle.

First claim

What is claimed is:

1 . A power tool that is configured to perform an operation by driving a tool bit in a longitudinal direction of the tool bit, the power tool comprising:
a motor; a driving mechanism that is driven by the motor and that is configured to drive the tool bit; a body housing that houses the motor and the driving mechanism; and a handle that is connected to the body housing so as to be allowed to move with respect to the body housing between a front position and a rear position in the longitudinal direction, while being biased by a biasing member in the longitudinal direction, the front position being closer to a tip of the tool bit and the rear position being farther from the tip, wherein: the power tool is configured such that movement of the handle, while being biased by the biasing member, between the front position and the rear position reduces transmission of vibration to the handle, the vibration being generated in the body housing during operation, the handle has a handle base and a handle cover, the handle base being disposed closer to the tip in the longitudinal direction and the handle cover being connected to the handle base on a side of the handle base opposite to the tip in the longitudinal direction, and the power tool further comprises a rear position defining member that extends from the body housing to a position between the handle base and the handle cover in the longitudinal direction and that is configured to define a rear position of the handle.

2 . The power tool as defined in claim 1 , wherein the rear position defining member includes:
an extending part that is connected to the body housing and that extends through the handle base in the longitudinal direction; and a stopper that is connected to the extending part and that comes in contact with the handle so as to restrict rearward movement of the handle.

3 . The power tool as defined in claim 2 , further comprising a rotation restricting mechanism that is configured to restrict rotation of the handle around an axis of the tool bit with respect to the body housing, wherein the rotation restricting mechanism comprises the extending part.

4 . The power tool as defined in claim 1 , wherein the handle base is configured to cover a part of the body housing, and a guide is provided between the handle base and the part of the body housing covered by the handle base, the guide being configured to guide movement of the handle with respect to the body housing.

5 . The power tool as defined in claim 1 , wherein one end of the biasing member is arranged in contact with the body housing, and the other end of the biasing member is arranged in contact with the handle cover.

6 . The power tool as defined in claim 1 , wherein:
the motor is arranged such that a rotation axis of an output shaft extends in parallel to the longitudinal direction, and the rear position defining member comprises a brush holder that holds a brush of the motor.

7 . The power tool as defined in claim 1 , wherein an auxiliary handle mounting part on which an auxiliary handle is mountable is mounted on the body housing via an elastic member.

8 . The power tool as defined in claim 2 , wherein:
a boss hole is formed in the extending part, and the stopper is configured as a screw or a bolt that threadably engages with the boss hole.

9 . The power tool as defined in claim 2 , wherein the stopper is configured as a nut that threadably engages with the extending part.

10 . The power tool as defined in claim 4 , wherein the guide comprises a plurality of guide elements arranged on an outer surface of the body housing, in a plurality of positions around an axis of the tool bit.

Assignees

• Makita Corp

Inventors

• Furusawa Masanori
• Watanabe Kei

Classifications

• B25D17/24

  Damping the reaction force {(resiliently mounted handles B25D17/043; dampers in connections of hammers to backhoes E02F3/966)} · CPC title

• B25F5/02

  Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)} · CPC title

• B25D11/00

  Portable percussive tools with electromotor {or other motor} drive · CPC title

• B25D2250/121

  Housing details · CPC title

• B25F5/006 Primary

  Vibration damping means · CPC title