Abrading – Frame or mount – Portable abrader
Reexamination Certificate
2000-02-22
2001-10-30
Hail, III, Joseph J. (Department: 3723)
Abrading
Frame or mount
Portable abrader
C451S360000, C451S344000
Reexamination Certificate
active
06309288
ABSTRACT:
FIELD OF THE INVENTION
The present invention is related to a retarding mechanism for a grinding machine, and especially to an effective improved structure on a prior retarding mechanism for a grinding machine; wherein, speed-reducing action of the grinding member can be more stable when in rotating. With this, cost of production, weight of the whole grinder as well as processes of assembling can all be reduced.
BACKGROUND OF THE INVENTION
The present invention is an improvement on a retarding mechanism for a grinding machine of a prior patent application (with a filing number: R.O.C. Application No. 87220682). The retarding mechanism for the grinding machine of the prior patent application includes a body, a plane plate, a grinding member and a plurality of abrasive members. Wherein, the body is provided therein with a motor of which a driving axle combines with an output axle, the output axle extends out of the body and can be driven by the driving axle of the motor for rotation. The body encircling the output axle is fixedly provided with an annular plane plate. The grinding member is fixedly provided with a fixing seat on the rear surface thereof by means of screws, and with a grinding tool on the front surface thereof. The fixing seat is provided on the periphery thereof with a plurality of grooves which each has a through hole on the bottom thereof. The abrasive members are made of material with low friction coefficient (such as Teflon, plastic etc.) The abrasive members are bending strips each with a width to be exactly receivable in the grooves. One end of each abrasive member has a through hole. The mode of combination of the abrasive members with the fixing seat is: one end of each abrasive member is received in one of the grooves to have two corresponding through holes aligned with each other, then a screw is extended through the two holes, and a nut is locked on the screw to fix the abrasive member in the groove. When the grinding member is assembled on the output axle extending out of the body, the bending protruding portion of the abrasive member contacts and presses the plane plate appropriately. In the mean time, if the grinding member is driven for rotating, the abrasive member will be rotated therewith, and friction force will be induced between the abrasive member and the plane plate to slow down the rotation speed of the grinding member.
However, the bending protruding portion of the abrasive member is structurally elastic, when elasticity thereof is weakened, the abrasive member tends to deviate; and height of the protruding portion is unable to be controlled, so friction force between the abrasive member and the plane plate can not be large, and can not effectively slow down the rotation speed of the grinding member. In view of this, the present invention provides improvement on the existed defect in speed reducing of the prior retarding mechanism for a grinding machine.
SUMMARY OF THE INVENTION
The present invention has a main object to provide a retarding mechanism for a grinding machine, wherein, the abrasive members are improved to have a more stable structure and have a broader contact area with the plane plate. So that when the grinding member rotates, the abrasive members can provide a better structure and larger friction force to retard the grinding member.
The present invention has another object to provide a retarding mechanism for a grinding machine, wherein, the abrasive members are arciform raised portions rather than bending strips. In this way, cost of production of the retarding mechanism can be lowered to be economic.
Another object of the present invention is to provide a retarding mechanism for a grinding machine, wherein, the abrasive members in the form of arciform raised portions are integrally molded with the fixing seat, assembling process of the present invention can thus be more convenient than that of the prior retarding mechanism for a grinding machine.
The retarding mechanism for a grinding machine of the present invention includes a body and a grinding member, the body is provided with an annular plane plate encircling an output axle, and the grinding member is fixedly provided with a fixing seat on the rear surface thereof. The retarding mechanism is characterized by that: the fixing seat is provided with a plurality of peripheral arciform raised portions to render the abrasive members thereof more solid and resistive to grinding and contactable with the plane plate in larger area. Therefore, during rotation of the grinding member, the abrasive members can provide a better structure to get larger friction force with the plane plate to endue the grinding member with a desired retarding effect.
The present invention will be apparent in the objects and functions after reading the detailed description of the preferred embodiment thereof in reference to the accompanying drawings.
REFERENCES:
patent: 6110028 (2000-08-01), Chung
patent: 374344 (1999-11-01), None
Hail III Joseph J.
Ostrolenk Faber Gerb & Soffen, LLP
Shanley Daniel
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