Abrading – Frame or mount – Portable abrader
Patent
1994-05-03
1995-10-17
Kisliuk, Bruce M.
Abrading
Frame or mount
Portable abrader
451344, B24B 2300
Patent
active
054585333
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on an eccentric disk sander of the generic type of claim 1.
An eccentric disk sander corresponding to the generic type is known from the EP 406 247 (U.S. Ser. No. 566 378), the eccentric disk of which is driven by a motor. Via an angle gear drive, the motor rotation is converted into the operating motion, which is of a rotational and a gyrating movement of the sanding disk. The angle drive take-off shaft is fixed at its free end to an eccentric. This eccentric, which is rotatably supported, carries a spigot on which the sanding disk is fixed relative to the take-off shaft, with an eccentricity "e". The sanding disk gyrates with the eccentricity "e" about the take-off shaft axis, at the same time rotating, due to the bearing friction, and performing the operating movement.
The bearings between the eccentric and the spigot are subjected to irregular loads. This causes heat development and wear. Moreover, in the known eccentric disk sanders, which usually stem from angle grinder designs, the separation between the sanding disk and the angular drive is large. This generates particularly high bearing forces. In addition, the sanding disk vibrations place a high physical Stress on the operator.
Advantages of the Invention
In contrast, the eccentric disk sander in accordance with the invention with the characterising features of claim 1 has the advantage that it is of a compact construction, has minor bearing wear, reduced vibration, lower manufacturing costs and better handling.
Due to the fact that instead of a spigot which carries the sanding disk, a long eccentric shaft is rotatably supported, and the eccentric is designed as a hollow shaft open at both ends, the bearing separation for the eccentric shaft can be very large, with the dimensions of the angular drive housing being compact. The bearing forces can be better calculated and controlled. The running of the eccentric shaft becomes smoother, and the bearing wear will lessen in spite of smaller bearings.
Further advantageous refinements of the invention are made possible by the claims following claim 1. It is regarded as particularly advantageous that the sanding disk movement can be influenced from that end of the eccentric shaft which faces away from the disk.
Drawing
Embodiment examples of the invention are more closely explained in the description which follows and in the attached drawings.
FIG. 1 shows an eccentric disk sander in accordance with the invention, FIG. 2 shows an enlarged section from FIG. 1, showing a view of the arrangement of the eccentric shaft support, with slightly varying function, and FIG. 3 shows a further embodiment example of an eccentric disk sander in accordance with the invention.
DESCRIPTION OF THE EMBODIMENT EXAMPLE
The eccentric disk sander 1 shown in FIG. 1, has a motor housing 3 on which an electric connection cable 5 and an ON/OFF switch 7 are arranged. The motor housing 3 has a housing 9 flange mounted to it which is designed as an angle drive housing and which carries an upper housing cover 11 and an angle drive 14 which is operationally connected to a sanding disk 13. The angle drive 14 consists of a small bevel wheel 15 which is located on a motor shaft 16 and which transmits the motor speed to a large bevel wheel 17. The bevel wheel 17 concentrically and fixed, embraces an eccentric which is designed as a hollow shaft 19, revolving about a rotational axis 18. The hollow shaft 19 is supported in the housing 9 in bearings 21, 23 which are located in regions both close to and remote from the sanding disk, this hollow shaft at the same time forms the take-off shaft of the angle drive 14. The hollow shaft has a bore 25 which is eccentric in relation to the rotational axis 18, with a spindle 26. The spindle 26 extends at a separation from the rotational axis 18, parallel to it, with the eccentricity "e". Within the eccentric bore 25, an eccentric shaft 27 is guided concentrically with the spindle 26, in an upper ball race 29 and a lower needle bearing 31.
A fan 33 for dust ex
REFERENCES:
patent: 4322921 (1982-04-01), Maier
patent: 4610111 (1986-09-01), Cox
patent: 4727682 (1988-03-01), Stabler et al.
patent: 5251406 (1993-10-01), Kirn
patent: 5261190 (1993-11-01), Berger et al.
Barth Walter
Knuth Michael
Banks Derris H.
Kisliuk Bruce M.
Robert & Bosch GmbH
Striker Michael J.
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