Eccentric grinding machine

Details Eccentric grinding machine Eccentric grinding machine

1990-08-28

1992-12-15

Parker, Roscoe V.

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

51120, B24B 2300

Patent

active

051705885

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention is based on an eccentric grinder or grinding machine. An eccentric grinder is known having an eccentric shaft and a grinding disk attached nonrotatably to the eccentric shaft as well as a device for changing the grinding movement of its grinding disk with at least one fixed toothed rim, wherein an outer region of the grinding disk is arranged without connection to the rest of the parts of the grinder and is spaced axially from the latter and the grinding disk is attached to the eccentric disk in a central portion. In such a grinder, as is described in DE-OS No. 36 09 441, the toothed rims of the eccentric gear unit are fastened partly to a toothed ring and partly directly to the grinding disk. As a result, a pressure exerted on the grinding disk edge during work leads to twisting of the toothed rim arranged on the grinding disk due to the elasticity of the latter and accordingly leads to meshing difficulties in the eccentric gear unit. Moreover, the gear unit comprising six toothed rims is relatively costly.


SUMMARY OF THE INVENTION

It is an object of the present invention to provide an eccentric grinding machine, in which the above-mentioned difficulties are eliminated.
This object, and others which will be made more apparent hereinafter, is attained in an eccentric grinding machine comprising a housing, an eccentric shaft, a grinding disk and a device for changing a grinding movement of the grinding disk having at least one fixed friction or toothed rim in a fixed relationship with the housing, the grinding disk being nonrotatably fixed in a central portion thereof with the eccentric shaft and an outer region of the grinding disk being arranged without connection to a remaining group of parts of the grinder and spaced axially therefrom.
According to the invention at least one exchangeable, reversible intermediate plate is provided for the grinder. Each of the intermediate plates is provided with at least one other friction or toothed rim. In operation one of the intermediate plates is mounted on the eccentric shaft and is engagable with the fixed friction or toothed rim having the fixed relationship with the housing to cause a rotary motion of the grinding disk in addition to an eccentric motion.
In contrast, the eccentric grinder, according to the invention, has the advantage that the grinding disk has no gear unit parts and is connected only in its central part with the next structural component part so as to be fixed with respect to rotation relative to it. This enables the use of elastic plastic for the grinding disk, without deformations of the disk being propagated into the gear unit. Moreover, the cost of the gear unit is reduced because two of the toothed rims of the prior art can be dispensed with.
It is particularly advantageous that the intermediate plates extend up to the eccentric shaft and accordingly have a heat conducting connection. The heat occurring in the bearings of the eccentric shaft can accordingly be conducted into the intermediate plate and can be conveyed from the latter to the air flow entering through the ventilation openings. Moreover, the ventilation openings facilitate the manual removal of the intermediate plate.
The use of four differently constructed intermediate plates or two intermediate plates with two different sides, respectively is also advantageous. This enables a total of four grinding movements of the eccentric grinder of different degrees of coarseness.
Since the toothed rims connected with the housing are constructed from plastic and the toothed rims of the intermediate plate are constructed of wear-resistant metal, or vice versa, wear occurs on one side of the plastic toothing, which can be easily exchanged. When the grinding disk is provided with fourteen properly spaced ventilation openings, commercially available six-hole grinding papers as well as those with eight can be used holes.


BRIEF DESCRIPTION OF THE DRAWING

The objects, features and advantages of the present invention will now be illustrated in mor

REFERENCES:
patent: 4467565 (1984-08-01), Wallace et al.
patent: 4727682 (1988-03-01), Stabler et al.
patent: 4759152 (1988-07-01), Berger et al.

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