# US 8,784,164 B2 · Power tool with a shield

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- Number: US 8,784,164 B2
- Document ID: US8784164B2
- Status: Granted
- Kind: B2
- Application number: 13/015,796
- Filed: 2011-01-28
- Published: 2011-08-11
- Granted: 2014-07-22
- Earliest claimed: 2010-02-09
- Assignees: Chervon (HK) Limited
- Applicants: Youjun Dai
- Inventors: Youjun Dai
- Web page: https://patentgrep.com/patent/US8784164B2

## CPC

- B24B 23/02: with rotating grinding tools; Accessories therefor
- B24B 55/05: specially designed for portable grinding machines
- B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS

## Abstract

A power tool includes a housing accommodating a motor therein, a bearing base having a lower surface and an upper end that is connected to the housing, an output shaft that is mounted in the bearing base and protrudes out of the lower surface of the bearing base, a shield that is movably connected with the bearing base, and a locking mechanism for locking the shield relative to the bearing base. The locking mechanism further includes a locking element arranged on the shield and a stop member and the bearing base is formed with a hollow chamber within which the stop member is arranged.

## Claims

### Claim 1

A power tool, comprising:
a housing accommodating a motor therein;
a bearing base having a lower surface and an upper end that is connected to the housing;
an output shaft mounted in the bearing base and protruding out of the lower surface of the bearing base;
a shield movably connected with the bearing base; and
a locking mechanism for locking the shield relative to the bearing base,
wherein the locking mechanism further comprises a locking element arranged on the shield and a stop member and wherein the bearing base is formed with a hollow chamber within which the stop member is arranged,
wherein the hollow chamber is formed with a guiding surface, and the stop member is formed with a guiding side surface and slidably mounted within the hollow chamber,
wherein a support spacer is mounted on the lower surface of the bearing base, wherein the stop member is further formed with an operation arm and a locking arm, and
wherein the bearing base further comprises a side wall formed with a side groove which communicates with the hollow chamber in the lower surface, and at least one of the operation arm or the locking arm passes through the side groove of the side wall.

### Claim 2 (depends on 1)

The power tool according to claim 1, wherein the locking element arranged on the shield is a groove which engages with the locking arm.

### Claim 3 (depends on 1)

The power tool according to claim 1, wherein an elastic component is arranged between the stop member and the bearing base and wherein one end of the elastic component acts on the stop member and a second end of the elastic component acts on the bearing base.

### Claim 4 (depends on 3)

The power tool according to claim 3, wherein the elastic component comprises a spring.

### Claim 5 (depends on 1)

The power tool according to claim 1, wherein cooperative disposed magnets are arranged between the stop member and the bearing base with a first one of the magnets mounted to the stop member and a second one of the magnets mounted to the bearing base.

### Claim 6 (depends on 1)

The power tool according to claim 1, wherein the hollow chamber is formed on the lower surface of the bearing base.