Work tool

Patent metadata

Field	Value
Publication number	US-2017239802-A1
Application number	US-201715435366-A
Country	US
Kind code	A1
Filing date	Feb 17, 2017
Priority date	Feb 19, 2016
Publication date	Aug 24, 2017
Grant date	—

Abstract

It is an object of the invention to provide a more rational vibration reducing technique for a work tool. A representative work tool 100 has an outer housing 102 , an inner housing 104 , a brushless motor 115 , a spindle 124 having a rotation axis extending in parallel to a rotation output shaft of the brushless motor 115 and configured to be rotated on the rotation axis within a prescribed angular range to drive a tool accessory 145 , a front elastic member 110 a disposed between a front inner housing region 104 a and a front outer housing region 102 a , and a rear elastic member 110 c disposed between at least one of an intermediate inner housing region 104 b and a rear inner housing region 104 c and at least one of an intermediate outer housing region 102 b and a rear outer housing region 102 c.

First claim

1 . A work tool, which performs a prescribed operation on a workpiece by driving a tool accessory, comprising:
an outer housing extending in an elongate form, an inner housing provided in the outer housing, a brushless motor, and a spindle having a rotation axis extending in parallel to a rotation output shaft of the brushless motor and configured to be rotated on the rotation axis within a prescribed angular range via the brushless motor to drive the tool accessory, in a longitudinal direction which is defined as an extending direction of the elongate outer housing, the outer housing having a front outer housing region that defines a front part of the outer housing, a rear outer housing region that defines a rear part of the outer housing, and an intermediate outer housing region that defines an intermediate part between the front outer housing region and the rear outer housing region so as to be held by a user, the inner housing having a front inner housing region that is arranged within the front outer housing region and houses at least the brushless motor, a rear inner housing region that is arranged within the rear outer housing region, and an intermediate inner housing region that is arranged within the intermediate outer housing region, a front elastic member disposed between the front inner housing region and the front outer housing region, and a rear elastic member disposed between at least one of the intermediate inner housing region and the rear inner housing region and at least one of the intermediate outer housing region and the rear outer housing region.

2 . The work tool as defined in claim 1 , further comprising an intermediate elastic member provided at a prescribed location in an area from the front inner housing region to the rear inner housing region via the intermediate inner housing region and configured to elastically connect the front inner housing region to at least the rear inner housing region.

3 . The work tool as defined in claim 2 , wherein at least part of the intermediate inner housing region is flexible and the flexible part defines the intermediate elastic member.

4 . A work tool, which performs a prescribed operation on a workpiece by driving a tool accessory, comprising:
an outer housing extending in an elongate form, an inner housing provided in the outer housing, a brushless motor, and a spindle having a rotation axis extending in parallel to a rotation output shaft of the brushless motor and configured to be rotated on the rotation axis within a prescribed angular range via the brushless motor to drive the tool accessory, in a longitudinal direction which is defined as an extending direction of the elongate outer housing, the outer housing having a front outer housing region that defines a front part of the outer housing, a rear outer housing region that defines a rear part of the outer housing, and an intermediate outer housing region that defines an intermediate part between the front outer housing region and the rear outer housing region, the inner housing having a front inner housing region that is arranged within the front outer housing region and houses at least the brushless motor, a rear inner housing region that is arranged within the rear outer housing region, and an intermediate inner housing region that is arranged within the intermediate outer housing region, a front elastic member disposed between the front inner housing region and the front outer housing region, and an intermediate elastic member provided at a prescribed location in an area from the front inner housing region to the rear inner housing region via the intermediate inner housing region and configured to elastically connect the front inner housing region to at least the rear inner housing region.

5 . The work tool as defined in claim 4 , wherein at least part of the intermediate inner housing region is flexible and the flexible part defines the intermediate elastic member.

6 . The work tool as defined in claim 1 , wherein a battery mounting part is provided in the rear inner housing region and a battery for supplying power to the brushless motor is mounted to the battery mounting part.

7 . The work tool as defined in claim 1 , further comprising:
a controller for controlling driving of the brushless motor, a connecting part for electrically connecting the brushless motor and the controller, a cooling fan, inlets through which air is take in from outside via the cooling fan, and outlets through which air is discharged to the outside, wherein: the inlets are formed in the rear inner housing region, the outlets are formed in the front inner housing region, an air passage is formed in the intermediate inner housing and configured to provide communication between the inlets and the outlets, and at least part of the connecting part is arranged in the air passage.

8 . The work tool as defined in claim 1 , wherein the intermediate outer housing region has a thin part having a smaller width than the front and rear outer housing regions in a transverse direction, when an extending direction of the rotation axis of the spindle is defined as a vertical direction and a direction crossing the longitudinal direction and the vertical direction is defined as the transverse direction.

9 . The work tool as defined in claim 1 , further comprising a controller for controlling driving of the brushless motor,
wherein at least the brushless motor is disposed in the front inner housing region and the controller is disposed in the rear inner housing region.

Assignees

• Makita Corp

Inventors

• Aoki Yonosuke

Classifications

• B25F5/001

  Gearings, speed selectors, clutches or the like specially adapted for rotary tools · CPC title

• B25F5/006 Primary

  Vibration damping means · CPC title

• B25F5/008

  Cooling means · CPC title

• B25F5/00 Primary

  Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for · CPC title

• B25F5/02

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