Eccentric grinder

Details Eccentric grinder Eccentric grinder

1989-06-06

1990-04-24

Schmidt, Frederick R.

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

51170MT, B24B 700

Patent

active

049188682

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention is based on an eccentric grinder of the generic type defined in the preamble of claim 1.
Such eccentric grinders offer the possibility of driving the grinding plate in three different forms of movement and accordingly of producing different grinding finishes. During the free running of the grinding plate, i.e. without rolling movement of the grinding plate rotating ring on the assigned rolling rings, a fine grinding is achieved, since the movement of every individual abrasive grain per revolution of the eccentric is very small. During the positive driving of the grinding plate opposite the direction of rotation of the eccentric, which is effected by means of the rolling of the external drive means of the second grinding plate rotating ring in the rolling means of the second rolling ring, every abrasive grain on the grinding plate describes a hypocycloid, so that the path of the grinding grains per revolution of the eccentric is increased and a greater grain removal is accordingly forced. The grinding finish changes correspondingly. During the positive driving of the grinding plate in the direction of rotation of the eccentric, which is effected by means of the rolling of the internal drive means of the first grinding plate rotating ring in the rolling means of the first rolling ring, every grinding grain describes a pericycloid. The grinding path of the abrasive grains per revolution of the eccentric is maximal. This grinding movement effects the greatest grain abrasion and is therefore well-suited for coarse grinding.
In a known eccentric grinder of the type named in the beginning (P No. 36 02 571.2) (=EP No. 230 621), the two rolling rings, as double toothed ring with internal and external toothing, are fastened at a sleeve which is stationary in the housing. The two grinding plate rotating rings, which are likewise constructed as toothed rings, are arranged so as to be axially offset relative to one another and are rigidly connected with the grinding plate. In order, respectively, to separate and produce the gearing connection between the rotating rings and their assigned rolling rings, the sleeve in the housing can be axially displaced in three positions. In its lowest position, the first rotating ring meshes with its internal toothing in the external toothing of the double toothed ring; in its upper position, the second rotating ring meshes with its external toothing in the internal toothing of the double toothed ring, while in its middle position the working connections between the double toothed ring and rotating rings are eliminated. This constructional design of the drive switching requires a minimum axial overall height of the grinding housing.


ADVANTAGES OF THE INVENTION

The eccentric grinder, according to the invention, with the characterizing features of claim 1 has the advantage that the desired switching possibility for the grinding movement of the grinding plate is achieved in an extremely small axial overall height of the grinding housing. The switching can be carried out quickly without having to wait for the grinding plate to stop, since the grinding plate rotating rings and their assigned rolling rings need not be engaged first in different planes; rather, they are engaged with one another continuously and from the beginning. The switching can accordingly be carried out without wear on the gearing also during the grinding process, that is, without turning off the drive. The switching device is user-friendly and easy to handle. The continuous engagement of the rotating rings and rolling rings prevents the rolling rings from rotating upward during their free running, since the rolling rings are subjected to a certain friction moment in their guides. The rotating and rolling rings can be constructed either as toothed rings, according to the embodiment form in claim 13, or as friction rings according to the embodiment form in claim 16.
Advantageous developments and improvements of the eccentric grinder indicated in claim 1 are made possible by means of the steps

REFERENCES:
patent: 2794303 (1957-06-01), Wickes
patent: 3482362 (1969-12-01), Bangerter et al.
patent: 4727682 (1988-03-01), Stabler et al.
patent: 4759152 (1988-07-01), Berger et al.
Patent Abstracts, Japan, vol. 5, No. 22, (M-54)694, 55150964, 11/1980.
Patent Abstracts, Japan, vol. 5, No. 80, (M-70)(752), 5627773, 3/1981.

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