Abrading – Frame or mount – Portable abrader
Patent
1999-05-24
2000-10-10
Banks, Derris Holt
Abrading
Frame or mount
Portable abrader
451441, 451344, B24B 2300, B24B 2708
Patent
active
06129618&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an oscillating sander and to an oscillating element of the oscillating sander.
BACKGROUND INFORMATION
European Patent Application No. 0 610 801 describes a conventional oscillating sander of the species whose tool holder is coupled onto the housing via a flexible oscillating element, the known oscillating elements being of elongated T-shaped configuration, and being respectively attached with their long, rod-shaped center web to the tool holder, and standing out at right angles therefrom and resting positively in recesses of the housing.
Because of the elongated shape of the known oscillating elements, the spacing of the tool holder from the housing is so great that the device is relatively less than compact, and the operator's hand is relatively far away from the workpiece being processed, so that it is thus difficult to process sensitively.
SUMMARY OF THE INVENTION
A oscillating sander according to the present invention has the advantage that as a result of the disk-shaped configuration, according to the present invention, of the oscillating element, the spacing between the tool holder and the housing can be kept considerably smaller than in the previously known art. The bearing spacings between the housing and the tool holder for the output shaft can accordingly also be kept small. The tilting moment acting on the bearings is consequently minimized, so that the output shaft can be made smaller and lighter.
The oscillating sander can thus be handled more sensitively, and workpieces can be processed particularly accurately with it.
The oscillating element according to the present invention meets, the need for minimum possible rotatability of the tool holder or tool with respect to the housing, along with a particularly smooth-running, minimally limited orbital oscillating motion of the tool holder with the tool during sanding operations. This ensures effective material removal when sanding in poorly accessible corners and flutes if the tool is applied especially firmly or at a tilt onto the workpiece, and reduces the load on the rotary bearings.
The oscillating element according to the present invention provides a compact and flat design for the oscillating sander, and excludes from the housing and from the lower bearing of the working shaft any sanding dust arriving from below. The oscillating element according to the present invention can moreover be mounted particularly easily on the oscillating sander by axially inserting the parts into one.
SUMMARY OF THE INVENTION
Because the oscillating element includes an outer ring and an inner ring, which are joined to one another by a spacer element made up of spoke-like ribs running obliquely with respect to a radial line, particularly hard limits are placed on rotation of the sanding plate with respect to the housing, the eccentric motion being guided and cushioned especially softly. This reduces the load on the working shaft bearings. According to, another exemplary embodiment of the prsent invention because, the spacer element is made of a rubber-like, injectable soft plastic with regular openings, certain regions of the spacer element can, upon deformation as a result of rotation of the tool with respect to the housing, enter into the deflection spaces thus created, thereby achieving a controlled spring characteristic similar to that with spoke-like ribs.
In addition, the openings in the spacer element result in the formation of correspondingly dimensioned and oriented ribs with which the different spring characteristic of the spacer element can be even better defined between hard rotational delimitation and soft radial delimitation.
Because the inner ring has lobes projecting radially outward, and the outer ring has counterlobes pointing radially inward and overlapping the lobes, the rotatability of the inner ring with respect to the outer ring is delimited by positive engagement; the spacer element is immobilized between the lobes and counterlobes and can be compressed en bloc by rotation
REFERENCES:
patent: 2786313 (1957-03-01), Shaff
patent: 5398454 (1995-03-01), Berner
patent: 5496207 (1996-03-01), Hornung et al.
patent: 5626510 (1997-05-01), Bergner et al.
patent: 5888128 (1999-03-01), Lamprecht et al.
Banks Derris Holt
Robert & Bosch GmbH
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