Electric tool

Patent metadata

Field	Value
Publication number	US-11833640-B2
Application number	US-202217955140-A
Country	US
Kind code	B2
Filing date	Sep 28, 2022
Priority date	Jan 13, 2017
Publication date	Dec 5, 2023
Grant date	Dec 5, 2023

Abstract

A grinder includes a brake mechanism, a switch lever, and a slide bar. In the grinder, an interlocking mechanism configured to interlock the brake mechanism with the switch lever includes a link member that is interposed between the switch lever and the slide bar, that moves the slide bar to the forward position at the push-in position of the switch lever, and that moves the slide bar to the retraction position at the initial position of the switch lever.

First claim

The invention claimed is:

1. An electric tool comprising:
a housing;
a motor housed in the housing;
a switch (i) housed in the housing and (ii) configured to drive the motor;
a switch lever (i) in an opening of the housing and (ii) configured to be moved by a user of the electric tool around a first pivot axis between an initial position at which the switch lever projects from the housing and a push-in position at which the switch lever is pushed toward the housing; and
a lever member (i) rearward of the switch lever in a front-rear direction, (ii) housed in the housing such that the lever member cannot be directly operated by the user of the power tool and (iii) pivotable around a second pivot axis, wherein
the first pivot axis and the second pivot axis are not co-axial,
the switch is rearward of the switch lever, and
the lever member is configured to interlock with operation of the switch lever such that (i) rotation of the switch lever around the first pivot axis causes rotation of the lever member around the second pivot axis and (ii) the lever member turns the switch ON when the switch lever is in the push-in position and (ii) turns the switch OFF when the switch lever is in the initial position.

2. The electric tool according to claim 1 , wherein
the lever member includes:
a fulcrum portion that is rotatably supported rearward of a plunger of the switch;
an effort point portion that is configured to interlock with the operation of the switch lever; and
a load point portion that is between the fulcrum portion and the effort point portion and configured to press the plunger.

3. The electric tool according to claim 2 , wherein
the fulcrum portion is at a rearmost portion of the housing.

4. The electric tool according to claim 3 , wherein
the housing includes a motor housing that houses the motor and extends rearward, and the fulcrum portion is at a rear portion of the motor housing.

5. The electric tool according to claim 4 , wherein
a switch receiving portion configured to hold the switch is integrally formed at the rear portion of the motor housing, and the fulcrum portion is at the switch receiving portion.

6. The electric tool according to claim 2 , wherein
the housing includes a motor housing that houses the motor and extends rearward, and the fulcrum portion is at a rear portion of the motor housing.

7. The electric tool according to claim 6 , wherein
a switch receiving portion configured to hold the switch is integrally formed at the rear portion of the motor housing, and the fulcrum portion is at the switch receiving portion.

8. The electric tool according to claim 2 , wherein
the switch lever has a strip shape extending in a front-rear direction, a front end rotatably supported by the housing, and a rear end swingable between the initial position and the push-in position.

9. The electric tool according to claim 8 , wherein
the lever member is a band-shaped plate extending in the front-rear direction, the lever member is rearward of the switch lever, the lever member has a rear end as the fulcrum portion and a front end as the effort portion, and the load point portion between the fulcrum portion and the effort point portion is in contact with the plunger at a projected position.

10. The electric tool according to claim 9 , wherein
the lever member has the effort portion inside the rear end of the switch lever and is biased by the plunger to a rotation position at which the switch lever is at the initial position.

11. The electric tool according to claim 10 , wherein
the switch lever and the lever member are on a lower surface of the housing, and the switch lever projects downward from the housing at the initial position.

12. The electric tool according to claim 1 , wherein
a brake mechanism is in the housing and includes a brake member configured to be moved between a brake position at which an output shaft of the motor is braked at the initial position of the switch lever and a brake release position at which the braking of the output shaft is released at the push-in position of the switch lever.

13. An electric tool comprising:
a housing;
a motor housed in the housing;
a switch (i) housed in the housing and (ii) configured to drive the motor;
a switch lever in the housing and configured to be movable between an initial position at which the switch lever projects from the housing and a push-in position at which the switch lever is pushed to the housing side and turns ON the switch; and
a lever member rearward of the switch lever, wherein
the switch is rearward of the switch lever,
the lever member is configured to interlock with an operation of the switch lever (i) to turn the switch ON at the push-in position of the switch lever and (ii) to turn the switch OFF at the initial position of the switch lever, and
the lever member includes: a fulcrum portion that is rotatably supported rearward of a plunger of the switch; an effort point portion that is configured to interlock with the operation of the switch lever; and a load point portion that is between the fulcrum portion and the effort point portion and configured to press the plunger.

14. The electric tool according to claim 13 , wherein
the fulcrum portion is at a rearmost portion of the housing.

15. The electric tool according to claim 14 , wherein
the housing includes a motor housing that houses the motor and extends rearward, and the fulcrum portion is at a rear portion of the motor housing.

16. The electric tool according to claim 15 , wherein
a switch receiving portion configured to hold the switch is integrally formed at the rear portion of the motor housing, and the fulcrum portion is at the switch receiving portion.

17. The electric tool according to claim 13 , wherein
the housing includes a motor housing that houses the motor and extends rearward, and the fulcrum portion is at a rear portion of the motor housing.

18. The electric tool according to claim 17 , wherein
a switch receiving portion configured to hold the switch is integrally formed at the rear portion of the motor housing, and the fulcrum portion is at the switch receiving portion.

19. The electric tool according to claim 13 , wherein
the switch lever has a strip shape extending in a front-rear direction, a front end rotatably supported by the housing, and a rear end swingable between the initial position and the push-in position.

20. The electric tool according to claim 19 , wherein
the lever member is a band-shaped plate extending in the front-rear direction, the lever member is rearward of the switch lever, the lever member has a rear end as the fulcrum portion and a front end as the effort portion, and the load point portion between the fulcrum portion and the effort point portion is in contact with the plunger at a projected position.

Assignees

• Makita Corp

Inventors

• Iwakami Junichi
• Muto Hideharu
• Otani Ryosuke

Classifications

• B24B47/26 Primary

  Accessories, e.g. stops · CPC title

• B24B23/02 Primary

  with rotating grinding tools; Accessories therefor · CPC title

• B24B47/12 Primary

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

• B25F5/008

  Cooling means · CPC title

• B24B55/00

  Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition (of general applicability for machine tools B23Q11/00; in general F16P) · CPC title