Abrading – Machine – Endless band tool
Patent
1995-02-07
1996-08-13
Kisliuk, Bruce M.
Abrading
Machine
Endless band tool
451296, 451355, 451297, B24B 2100
Patent
active
055450776
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a belt grinder or band sander. DE 37 15 292 A1 discloses a band sander of this type in which the motor shaft and the driven band roller each support a belt pulley. The distance between the belt pulleys is fixed by design. However, for this reason the tension of the belt tightened over the belt pulleys cannot be adjusted subsequently. Excessive tension in the belt reduces the performance of the band sander and can lead to premature wear at the bearings and belt. Belts with insufficient tension also wear out faster, result in slippage and frequently cause disturbingly loud operating noise.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a band sander 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 a band sander having a band running case, an abrasive band revolving in the band running case over band rollers, a motor housing placed on the band running case and connectable with the latter, a belt drive having belt wheels for transmitting a motor torque to one of the band rollers, wherein in accordance with the present invention the band sander has means for adjusting a distance between the belt wheels which determines a tension of the attached belt, and the means act between the motor housing and the band running case and is formed as an insert plate having a longitudinal axis parallel to the belt wheel axis when in operating position, and the plate has steps of varying height along the longitudinal axis.
When the band sander is designed in accordance with the present invention, it has the advantage over the prior art that the belt tension can be adjusted in a simple manner when the device is already assembled. Accordingly, manufacturing tolerances at the motor housing and band running case and at the bearing of the driven shaft and band roller as well as length tolerances in the belt itself can be compensated.
In a particularly advantageous manner, a flat insert plate with steps of varying height is provided in the region of the belt between the motor housing and band running case. The advantage of the steps consists in that the distance between the motor housing and band running case can be varied simply by shifting the insert plate in the direction of the separating joint between the two parts. A handle projection is accessible from the outside in every position and is covered by the cover cap of the belt drive after adjustment.
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 DRAWINGS
FIG. 1 shows a perspective view;
FIG. 2 shows a top view of the band running case with the motor housing removed; and
FIG. 3 shows a perspective view of an insert plate.
DESCRIPTION OF PREFERRED EMBODIMENTS
A hand-operated band sander has a two-part motor housing 2 of plastic with a lower part 3 and an upper part 4, a motor and a gear unit being accommodated therein. A handle 5 with switch 6 is formed integral with the lower part 3. A housing cover covering the switch 6 and a portion of the upper part 4 has been removed and is not shown in FIG. 1. The motor housing 2 is placed upon a band running case 7 of aluminum and is fastened thereto by screws 8. The roughly horizontally extending seam between the motor housing 2 and band running case 7 is designated by 9. An abrasive band guided over two band rollers 10, 11 revolves in the band running case 7. One of the band rollers 10 is connected with a first toothed belt wheel 14 which projects laterally coaxially so as to be fixed with respect to rotati
REFERENCES:
patent: 2576745 (1951-11-01), Auten
patent: 4334390 (1982-06-01), Sumerau
patent: 4642943 (1987-02-01), Taylor, Jr.
patent: 5185963 (1993-02-01), De Brey
Boeck Cornelius
Fuchs Rudolf
Kisliuk Bruce M.
Morgan Eileen P.
Robert & Bosch GmbH
Striker Michael J.
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