Mechanism for slowing down idling shoe of an electric polisher

Details Mechanism for slowing down idling shoe of an electric polisher Mechanism for slowing down idling shoe of an electric polisher

2000-01-12

2001-07-24

Morgan, Eileen P. (Department: 3723)

Abrading

Frame or mount

Portable abrader

C451S357000

Reexamination Certificate

active

06264539

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a mechanism particularly designed for slowing down an idling shoe of an electric polisher or similar machines that rotate at high speed.
DESCRIPTION OF THE PRIOR ART
In a common polisher, a polishing element, such as a polishing wheel, a grinding wheel or a piece of abrasive non-woven cloth, is fixedly attached to an output shaft of the polisher, and the output shaft of the polisher is directly connected to a driving shaft of a motor. When the motor is started, the polishing element is driven to rotate at high speed to polish an article.
When a conventional electric polisher is turned on, the polishing element attached thereto is immediately driven to rotate at very high speed. A user tends to be dangerously and accidentally injured by the polishing element rotating at high speed.
It is therefore tried by the inventor to develop a mechanism for slowing down an idling shoe of an electric polisher, so that the electric polisher is safe for use.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide a mechanism for slowing down an idling shoe of an electric polisher so that the shoe of the polisher would not idle at dangerously high speed.
Another object of the present invention is to provide a mechanism for slowing down an idling shoe of an electric polisher so that the polisher is highly safe for use.
To achieve the above and other objects, the mechanism for slowing down idling shoe of an electric polisher according to the present invention mainly includes an actuating spindle that downward extends through a protective cover connected to a bottom of a housing of the polisher and has a lower end forming an eccentric shaft, a fixing seat that is mounted around the eccentric shaft of the actuating spindle and has a ball bearing fitted therein, a brake ring that has an elastic inner ring tightly fitted around a lower outer periphery of the fixing seat and an outer ring engaged with an underside of the protective cover, a shoe that is screwed to a bottom of the fixing seat for holding a polishing element thereto. When the shoe is idling, the eccentric shaft of the actuating spindle brings the fixing seat to rotate synchronously in eccentric motion to increase a frictional force between the fixing seat and the brake ring, so that the idling shoe rotates at low speed and vibrates at high frequency.


REFERENCES:
patent: 4516358 (1985-05-01), Marton et al.
patent: 5679066 (1997-10-01), Butz et al.
patent: 5813903 (1998-09-01), Amano et al.
patent: 5941765 (1999-08-01), Taylor
patent: 6110028 (2000-08-01), Chung
patent: 6132300 (2000-10-01), Martin

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