Abrading – Frame or mount – Portable abrader
Patent
1997-11-26
1999-01-05
Rose, Robert A.
Abrading
Frame or mount
Portable abrader
451344, 451342, 451121, 451163, B24B 2300
Patent
active
058555048
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention relates to a hand-held orbital sander of the species defined in the preamle of claim 1.
In a known orbital sander of this species, also known as electrical hand-held orbital sander (EP 0 610 801 A1), the flexible connection between the housing containing the electrical drive motor for the rotating eccentric journal and the tool holder with a sanding tool is embodied by means of oscillating elements with a T-profile, which are respectively mounted on the tool holder by means of their long, rod-shaped center brace, and extend away from it parallel with the pivot bearing axis, and are inserted form-fittingly by means of their shorter cross brace in the recesses formed in the housing.
ADVANTAGES OF THE INVENTION
In contrast therefor, the hand-held orbital sander in accordance with the invention with the characterizing features of claim 1 has the advantage, that by means of the oscillating device for the flexible connection of the tool holder to the housing embodied in accordance with the invention a symmetrical distribution of force takes place. The torque of the tool holder with the oscillating device can be adjusted as needed in accordance with grade and thickness of the elastic formed part. On the one hand, the oscillating device meets the requirements for the "hardest" possible torsion in an ideal way, which is advantageous for the removal action of sanding, and in another way a "soft" movement via the eccentric journal, which is advantageous for the stress on the pivot bearing.
The oscillating device in accordance with the invention allows a compact and flat structure of the orbital sander and in addition serves as a seal against sanding grit at the lower bearing of a main shaft driven by the electrical motor and holding the eccentric journal at its end.
Further advantageous developments and improvements of the hand-held orbital sander in accordance with claim 1 are possible by means of the steps recited in the additional claims.
DRAWINGS
The invention will be explained in more detail in the following description by means of an examplary embodiment shown in the drawings. Shown are in:
FIG. 1, a partial lateral view of a hand-held, electrical orbital sander, partially in section,
FIG. 2, a top view of an oscillating device in the orbital sander in accordance with FIG. 1,
FIG. 3, a lateral view of the oscillating device in accordance with FIG. 2 with a section along the line III--III in FIG. 2 on the right side of the drawings,
FIG. 4, a view of the underside of an inner ring of the oscillating device in FIGS. 2 and 3.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
The hand-held, particularly electrical orbital sander shown partially in a lateral view and partially in section in FIG. 1 is embodied as a so-called Delta sander, which holds a triangular-shaped, symmetrical sanding wheel as sanding tool 10. The underside of the sanding wheel made of plastic is outfitted with a Velcro layer 11 for the acceptance of sanding wheels, not shown. The orbital sander can, however, also be equipped with a triangular-shaped sanding wheel or can be operated with other sanding tools, for example a multi-disc fixture or a sanding tongue or a sanding tube.
The orbital sander is comprised of a dual-shell housing 12, which is assembled by means of two housing shells 121, 122, which meet longitudinally at a joint 123 running parallel with the longitudinal axis of the housing. The housing 12 contains an electrical motor 13, of which merely the fan 15 seated on the power take-off shaft 14 can be seen in FIG. 1. A slidable switch 16 disposed on top of the housing 12 serves to switch the electrical motor 13 on and off. By means of a bevel gear 17, the power take-off shaft 14 drives a main shaft 18, which is rotatably seated in two ball bearings 19a and 19b firmly attached to the housing and with an eccentric journal 20 extends from the housing 12 at the lower end face of the housing 12. A tool holder 22 is seated on the eccentric journal 20 by means of a ball bearing 21 press-fitted into the tool holder 2
REFERENCES:
patent: 3345784 (1967-10-01), Stelljes et al.
patent: 4729194 (1988-03-01), Maier et al.
patent: 5679066 (1997-10-01), Butz et al.
patent: 5709595 (1998-01-01), Bergner et al.
Bergner Joao
Hild Eugen
Nguyen George
Robert & Bosch GmbH
Rose Robert A.
Striker Michael J.
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