Grinder with easily replacing grinding tool

Abstract: A grinder has a main body formed with a shaft chamber and a rotary shaft rotatably mounted in the shaft chamber. One end of the rotary shaft outward protrudes from the main body for installing a grinding tool thereon. A passage and a slide way are formed in the main body. One end of the passage communicates with the shaft chamber. A front end of the slide way communicates with the passage. A chucking button is disposed in the passage. A link is movably arranged in the slide way. An activation switch is mounted on the main body for controlling the operation of the grinder. When the grinder is not activated, the chucking button can be pressed to chuck the rotary shaft for easy replacement of a grinding tool. When the activation switch is switched on to activate the grinder, the link is chucked in the chucking button to prevent the chucking button from being pressed. Accordingly, when the grinder operates, the chucking button cannot chuck the rotary shaft so as to ensure safety. When the rotary shaft is chucked by the chucking button, the activation switch cannot be switched on. (end of abstract)

Grinder with easily replacing grinding tool description/claims

Brief Patent Description

Full Patent Description

Patent Application Claims

FIELD OF THE INVENTION

The present invention is related to a grinding device, and more particularly to a grinder in which the grinding tool can be easily replaced. Moreover, when replacing the grinding tool, the grinder is prevented from being powered on.

BACKGROUND OF THE INVENTION

A conventional grinder has a rotary shaft on which a grinding tool such as a grinding disc or a buffing disc is mounted for grinding a work piece.

In operation, it is necessary to frequently replace the grinding tool. Conventionally, when replacing the grinding tool, a hand tool is used to fix the rotary shaft and prevent the rotary shaft from rotating. Under such circumstance, the grinding tool can be replaced.

However, it is inconvenient to fix the rotary shaft with a specific hand tool. In addition, a user must carry and store the hand tool. In order to solve this problem, the inventor had designed grinders with different kinds of mechanisms for chucking the rotary shaft so that the grinding tool can be easily replaced without using any hand tool. The invention is designed under the same purpose.

SUMMARY OF THE INVENTION

It is therefore a primary object of the present invention to provide a grinder in which the grinding tool can be easily replaced.

It is a further object of the present invention to provide the above grinder which has a secure design, the grinder is prevented from being incautiously activated when replacing the grinding tool.

The present invention can be best understood through the following description and accompanying drawings wherein:

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a first embodiment of the present invention;

FIG. 2 is a sectional view taken along line 2-2 of FIG. 1;

FIG. 3 is a sectional view taken along line 3-3 of FIG. 2;

FIG. 4 is a sectional view taken along line 4-4 of FIG. 3;

FIG. 5 is a sectional view according to FIG. 4, showing that the chucking button chucks the rotary shaft;

FIG. 6 is a sectional view according to FIG. 2, showing that the chucking button is positioned in the chucking position;

FIG. 7 is a sectional view according to FIG. 3, showing that the trigger is pulled;

FIG. 8 is a sectional view taken along line 8-8 of FIG. 7;

FIG. 9 is a perspective view of a second embodiment of the present invention;

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Previous Patent Application:
Device for the finish machining of circumferential surfaces of substantially rotationally symmetrical workpiece portions on shaft-like workpieces
Next Patent Application:
Transmission structure of the stone chamfering machine tool holder
Industry Class:
Abrading

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