Power tool

Patent metadata

Field	Value
Publication number	US-12558767-B2
Application number	US-202318516401-A
Country	US
Kind code	B2
Filing date	Nov 21, 2023
Priority date	Nov 24, 2022
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

A power tool has a motor, an output shaft, a spindle, a gear, a gear housing and a bearing. The spindle is configured to be rotated around a drive axis crossing an extending direction of the output shaft. The gear is fitted on the spindle and configured to transmit rotation of the output shaft to the spindle. The gear housing houses the spindle, the gear and the bearing with the lower end part of the spindle protruded downward. The bearing is arranged on the radially outer side of the gear and configured to support the spindle so as to be rotatable around the drive axis.

First claim

The invention claimed is:

1 . A power tool, comprising:
a motor; an output shaft that is configured to be rotated around an output axis by the motor; a spindle that is configured to be rotated around a drive axis crossing an extending direction of the output axis and defining an up-down direction of the power tool, the spindle having a lower end part that is configured such that a tool accessory is removably mounted thereto; a gear that is press-fitted on the spindle to transmit rotation of the output shaft to the spindle; a gear housing that houses the spindle and the gear with the lower end part of the spindle protruded downward; a bearing that is housed in the gear housing and arranged on a radially outer side of the gear and configured to support the spindle so as to be rotatable around the drive axis, a cover body that is configured to at least partially cover the tool accessory mounted to the lower end part, under the gear housing; a first engagement part that is fixed to the cover body; and a second engagement part, at least part of which is housed in the gear housing, which is movable between an engagement position in which the second engagement part mechanically engages the first engagement part to restrict rotation of the cover body around the drive axis, and a disengagement position in which the second engagement part is to be disengaged from the first engagement part to allow the cover body to rotate around the drive axis.

2 . The power tool as defined in claim 1 , wherein a lower end of the second engagement part is located in the same position as or above a lower end of the gear housing in the up-down direction.

3 . The power tool as defined in claim 1 wherein:
the second engagement part includes a rotational axis extending in a direction that is orthogonal to the output axis and the drive axis.

4 . A power tool comprising:
a motor; an output shaft that is configured to be rotated around an output axis by the motor; a spindle that is configured to be rotated around a drive axis crossing an extending direction of the output axis and defining an up-down direction of the power tool, the spindle having a lower end part that is configured such that a tool accessory is removably mounted thereto; a gear that is press-fitted on the spindle to transmit rotation of the output shaft to the spindle; a gear housing that houses the spindle and the gear with the lower end part of the spindle protruded downward; a bearing that is housed in the gear housing and arranged on a radially outer side of the gear and configured to support the spindle so as to be rotatable around the drive axis, a housing including the gear housing and a shaft housing part that extends in a front-rear direction in which the output shaft extends, and houses at least part of the output shaft; and a first bearing and a second bearing that are arranged apart from each other in the front-rear direction and hold the output shaft in the housing so as to be rotatable around the output axis, wherein: the shaft housing part has a recess that is arranged between the first and second bearings in the front-rear direction and recessed upward from a lower surface of the shaft housing part in the up-down direction.

5 . The power tool as defined in claim 4 , wherein the recess extends across the shaft housing part in a direction crossing the front-rear direction and the up-down direction.

6 . The power tool as defined in claim 4 , comprising:
a cover body that is configured to at least partially cover the tool accessory mounted to the lower end part: a first engagement part that is fixed to the cover body; and a second engagement part that is disposed in the housing and can be moved between an engagement position to be engaged with the first engagement part to restrict movement of the cover body around the drive axis and a disengagement position to be disengaged from the first engagement part, wherein: at least part of the first engagement part is arranged in the recess.

7 . A power tool, comprising:
a motor; an output shaft that is configured to be rotated around an output axis by the motor; a spindle that is configured to be rotated around a drive axis crossing an extending direction of the output shaft and defining an up-down direction of the power tool, the spindle having a lower end part that is configured such that a tool accessory is removably mounted thereto; a gear that is fitted on the spindle and configured to transmit rotation of the output shaft to the spindle, the gear having an opening in a lower surface of the gear and has a first recess recessed upward from the opening; a gear housing that houses the spindle and the gear with the lower end part of the spindle protruded downward; a bearing that is housed in the gear housing and arranged on a radially outer side of the gear and configured to support the spindle so as to be rotatable around the drive axis, wherein the lower end part of the spindle is configured such that the tool accessory can be removably mounted thereto by a fastening member being threadedly engaged around the drive axis with the lower end part, the power tool comprises a rotary tool that performs an operation on a workpiece by rotationally driving the tool accessory, and the power tool further comprises an anti-loosening part at least part of which is housed in the first recess in the up-down direction, the anti-loosening part being configured to suppress loosening of the fastening member.

8 . The power tool as defined in claim 7 , wherein a whole of the anti-loosening part is housed in the first recess.

9 . The power tool as defined in claim 7 , wherein the anti-loosening part is arranged to overlap with the bearing in the up-down direction.

10 . The power tool as defined in claim 7 , wherein the anti-loosening part includes a pair of cam faces facing each other in the up-down direction.

11 . The power tool as defined in claim 10 , wherein:
the anti-loosening part includes a pair of washers, the cam faces comprise facing surfaces of the washers, respectively, and each of the washers further has a rib face provided on a side opposite to the cam face in the up-down direction.

12 . The power tool as defined in claim 7 , comprising:
a flange that is formed between the anti-loosening part and the tool accessory in the up-down direction, or integrally formed with the tool accessory arranged under the anti-loosening part, wherein at least part of the flange is housed in the first recess.

13 . The power tool as defined in claim 1 , wherein the gear and the bearing are adjacent in a radial direction and an inner circumferential surface of the bearing is in contact with an outer circumferential surface of the gear.

14 . The power tool as defined in claim 7 , wherein an outer diameter of the bearing is larger than an outer diameter of the gear.

15 . The power tool as defined in claim 7 , wherein the bearing directly holds the gear and holds the spindle via the gear such that the spindle can rotate around the drive axis.

16 . The power tool as defined in claim 14 , wherein the gear housing has a rib that holds an outer ring of the bearing.

17 . The power tool as defined in claim 7 , wherein the first recess includes a side surface that is spaced apart from an outer diameter surface of the spindle in a radial direction.

18 . The power tool as defined in claim 7 , wherein:
the spindle has a spindle flange having an outer diameter larger than an inner diameter of the gear, and the spindle

Assignees

• Makita Corp

Inventors

• Kawakami Takahiro
• Ninagawa Satoshi
• Otani Ryosuke
• Honma Shinichi

Classifications

• B24B47/12 Primary

  by mechanical gearing or electric power (B24B47/16 takes precedence) · CPC title

• B24B23/028

  Angle tools · CPC title

• B25F5/02

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

• B25F5/001 Primary

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