Power tool

Patent metadata

Field	Value
Publication number	US-12358097-B2
Application number	US-202217944724-A
Country	US
Kind code	B2
Filing date	Sep 14, 2022
Priority date	Oct 5, 2021
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

Abstract

A power tool has highly airtight electrical connection between a controller and a switch to effectively prevent a short circuit. A grinder includes a housing, a motor accommodated in the housing, a controller accommodated in the housing and including a circuit board and a controller terminal located on a first facing surface and electrically connected to the circuit board, a switch accommodated in the housing and including a switch terminal located on a second facing surface facing the controller, being in direct contact with the controller terminal, and electrically connected to the controller terminal, and a seal located between the first facing surface and the second facing surface and sealing a periphery of the controller terminal and a periphery of the switch terminal with the controller terminal being in direct contact with the switch terminal. The first facing surface is a surface of the controller facing the switch.

First claim

What is claimed is:

1. A power tool, comprising:
a housing;
a motor accommodated in the housing;
a controller accommodated in the housing, the controller including
a circuit board, and
a controller terminal located on a first facing surface and electrically connected to the circuit board;

a switch accommodated in the housing, the switch including a switch terminal located on a second facing surface facing the controller, the switch terminal being in direct contact with the controller terminal and electrically connected to the controller terminal;
a seal between the first facing surface and the second facing surface, the seal sealing a periphery of the controller terminal and a periphery of the switch terminal with the controller terminal being in direct contact with the switch terminal;
a cylinder on the second facing surface, the cylinder comprising a resin, the cylinder covering the periphery of the switch terminal; and
a second cylinder on the first facing surface, the second cylinder comprising a resin, the second cylinder covering the periphery of the controller terminal and protruding toward the cylinder,
wherein the first facing surface is a surface of the controller facing the switch,
the cylinder protrudes toward the second cylinder,
the housing includes
an inner housing between the switch and the controller, the inner housing having a through-hole,
a switch holder on a first surface of the inner housing, the switch holder holding the switch, and
a controller holder on a second surface of the inner housing, the controller holder holding the controller, and

one of the cylinder or the second cylinder is placed in another of the cylinder or the second cylinder through the through-hole.

2. The power tool according to claim 1 , wherein
the seal is located on the first facing surface, and
the cylinder is in contact with the seal and seals the periphery of the controller terminal and the periphery of the switch terminal with the controller terminal being in direct contact with the switch terminal.

3. The power tool according to claim 2 , wherein
the second cylinder is placed in the cylinder with the controller terminal being in direct contact with the switch terminal.

4. The power tool according to claim 3 , wherein
the cylinder and the second cylinder are integral with the controller or the switch.

5. The power tool according to claim 4 , wherein
the cylinder and the second cylinder cover a full portion of the periphery of the controller terminal or the switch terminal.

6. The power tool according to claim 3 , wherein
the cylinder and the second cylinder cover a full portion of the periphery of the controller terminal or the switch terminal.

7. The power tool according to claim 2 , wherein
the switch includes
a switch housing, and
an output terminal connected to the motor, and

the switch housing includes a terminal protector covering a part of the output terminal in a contactless manner.

8. The power tool according to claim 1 , wherein
the seal is located on the second facing surface, and
the second cylinder is in contact with the seal with the controller terminal being in direct contact with the switch terminal, and the second cylinder seals the periphery of the controller terminal and the periphery of the switch terminal.

9. The power tool according to claim 8 , wherein
the cylinder is placed in the second cylinder with the controller terminal being in direct contact with the switch terminal.

10. The power tool according to claim 9 , wherein
the cylinder and the second cylinder cover a full portion of the periphery of the controller terminal or the switch terminal.

11. The power tool according to claim 1 , wherein
the switch includes
a switch housing, and
an output terminal connected to the motor, and

the switch housing includes a terminal protector covering a part of the output terminal in a contactless manner.

12. The power tool according to claim 1 , wherein
the controller includes a pair of power input terminals to receive power to the circuit board, and
a protector is located at least on each of surfaces of the pair of power input terminals facing each other to protect a corresponding power input terminal of the pair of power input terminals.

13. The power tool according to claim 1 , wherein
the seal includes an elastic sheet.

14. The power tool according to claim 1 , further comprising:
a switch positioner positioning the switch in the inner housing.

15. The power tool according to claim 14 , further comprising:
a controller positioner positioning the controller in the inner housing.

16. The power tool according to claim 1 , further comprising:
a controller positioner positioning the controller in the inner housing.

Assignees

• Makita Corp

Inventors

• Ishikawa Junya

Classifications

• B25F5/02

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

• H02K11/30

  Structural association with control circuits or drive circuits · CPC title

• H02K5/10

  with arrangements for protection from ingress, e.g. water or fingers · CPC title

• H02K2211/03

  Machines characterised by circuit boards, e.g. pcb · CPC title

• H02K11/28

  Manual switches · CPC title