Eccentric grinder

Details Eccentric grinder Eccentric grinder

1991-08-15

1993-11-16

Parker, Roscoe V.

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

51119, B24B 2300

Patent

active

052611906

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to an eccentric grinder. More particularly it relates to an eccentric grinder which has an eccentrically circulating grinding disc with a gear rim rolling on another gear ring. Such an eccentric grinder is disclosed in DE PS 36 25 655. In the very fine grinding stage, this grinder is safe-guarded against an undesirable increase of the rotary speed of the grinding disc to the idling speed of the machine. This safeguard has been designed in the form of a friction brake, which however requires a considerable number of individual parts and elaborate assembly work. The friction brake is prone to problems and is sensitive to dust. A major effort in sealing technology has therefore to be made. The reliability of the brake diminishes as the wear of its individual parts, such as springs and brake linings, increases. Their repair requires substantial costs. In the harsh industrial operating environment, the known eccentric grinder has the following further disadvantages: The teeth of the eccentric gear are subject to high wear due to the effect of grinding dust. The change-over gear for the additional grinding stage for producing a medium coarseness requires complicated means of setting, which are susceptible to trouble and are lacking in stability. Any careless operation of the gear changes poses the risk of breaking the eccentric gear teeth.


SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide an eccentric grinder which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in an eccentric grinder in which a gear rim supported by a grinding disc is formed as a friction rim, a gear rim on which the first mentioned gear rim rolls is fixed on a housing and formed as a toothed rim, and the rims are frictionally engaged so that in operation without loads there is minimum slippage and in operation under load there is maximum slippage.
The eccentric grinder with the characteristic features of the present invention has the advantage of providing high grinding output with a simple space-saving set-up. The eccentric gear teeth are highly resistant to mechanical wear, and the life of the gearing is substantially increased. The hazardous overspeeding of the grinding disc at idling speed is eliminated in a particularly simple manner.
A further modification of the eccentric grinder has in addition the known operating modes, for coarse and medium grinding which are implemented in a simple, careful way by changing the different eccentric rims supported by the grinding disc.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.


BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 shows a sectional view of an eccentric grinder, FIG. 2 shows a grinding disc with an eccentric gear with a ring-shaped friction lining, FIG. 3 shows a grinding disc with an eccentric gear with a bristle studded friction lining, FIG. 4 shows a grinding disc with a toothed eccentric gear consisting of a toothed belt with a rim-like support collar, and
FIGS. 5, 6 and 7 are views showing further modifications of the eccentric grinder in accordance with the present invention.


DESCRIPTION OF THE PREFERRED EMBODIMENT

The eccentric grinder shown in FIG. 1 has a housing for a grinding disc drive, and a drive housing 3. The housing 2 is provided with a connecting piece 4 for the connection of a suction device 5 and is connected to the drive housing by means of screws 6. A drive shaft 7 projects from the drive housing 3. An intermediate piece 8 is screwed onto this. The intermediate piece 8 is designed

REFERENCES:
patent: 3287859 (1966-11-01), Leveque
patent: 4754575 (1988-07-01), Schneider
patent: 4759152 (1988-07-01), Berger et al.

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