IP Library › Granted Patent US 7,109,613
Granted Patent B2
US 7,109,613 · App. 10/828,279 · Granted Sep 19, 2006

Power hand tool

Assignee: Choon Nang Electrical Appliance Mfy., Ltd.
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Quick Facts
Patent No.
US 7,109,613
App. No.
10/828,279
Granted
Sep 19, 2006
Kind
B2
Abstract

A power hand tool includes a body and an electric motor in the body and having a shaft for driving a connector for connecting and driving a cleaning/polishing implement. An enclosure encloses the motor for protection against intrusion of a liquid, and includes a thermally conductive end cap that is exposed outside of the body. A thermal conductor in contact with a metal casing of the motor and the end cap conducts heat from the motor to the end cap for heat dissipation.

Claims (17)

1. A power hand tool comprising:

a body;

an electric motor located in the body and having a shaft for driving a connector for connecting and driving an implement, the motor having a metal motor casing;

an enclosure located within the body and having an open end, wherein the motor is disposed within the enclosure;

a thermally conductive enclosure part engaging and enclosing the open end of the enclosure, protecting the motor against intrusion of a liquid, the enclosure part being exposed outside of the body; and

a thermal conductor within the enclosure and having a central part in contact with the metal motor casing and opposed side parts in contact with the enclosure part for conducting heat from the motor to the enclosure part for heat dissipation.

2. The power hand tool as claimed in claim 1 , wherein the enclosure part is situated outside the body.

3. The power hand tool as claimed in claim 1 , wherein the enclosure part is positioned in close proximity to the connector.

4. The power hand tool as claimed in claim 3 , wherein the enclosure part has an apertured portion through which the connector extends from inside the enclosure.

5. The power hand tool as claimed in claim 4 , wherein the apertured portion is tubular and supports the connector for rotation.

6. The power hand tool as claimed in claim 1 , wherein the thermal conductor is in surface contact with an end wall of the metal motor casing through which the motor shaft projects.

7. The power hand tool as claimed in claim 1 , wherein the thermal conductor is secured by screws to the metal motor casing.

8. The power hand tool as claimed in claim 1 , wherein the thermal conductor is secured by screws to the enclosure part.

9. The power hand tool as claimed in claim 1 , including a gearbox connecting the motor shaft to the connector, the gearbox being flanked by the opposed side parts of the thermal conductor.

10. The power hand tool as claimed in claim 1 , wherein the enclosure is a generally tubular unitary body having a substantially closed end opposite the open end.

11. The power hand tool as claimed in claim 10 , wherein the enclosure is a plastic.

12. The power hand tool as claimed in claim 1 , wherein the enclosure is a plastic.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 21, 2004
From: LUI, TAT NIN
To: CHOON NANG ELECTRICAL APPLIANCE MFY., LTD.
Reel/Frame 015260/0116 →
Continuity (1)
Related Publication 20050236917A1 · Oct 27, 2005