Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1991-10-29
1994-06-14
Parker, Roscoe V.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
B24B 2306
Patent
active
053198875
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention is directed to a hand belt sander. More particularly, it relates to a hand belt sander which has a housing for receiving a motor, a drive roller and a deflecting roller, an endless sanding belt guided along the deflecting roller and over a sanding plate, and a guide plate which has a control plate with a fork-shaped end for receiving the deflecting roller and arranged to be displaceable with the latter.
A hand belt sander of the generic type comprising drive and deflecting rollers and an automatic belt running centering means is described in EP-PS 7172. A feeler with a lever system for swiveling the deflecting roller is supported at the housing of the known hand belt sander. The support is located near the deflecting roller.
Hand belt sanders have the peculiarity that the circulating sanding belt wanders laterally, depending on the force and direction of application. The belt running centering means is provided in order to ensure that the center of the sanding belt accurately conforms to the center of the drive or deflecting roller running surface. As soon as the sanding belt moves transversely relative to the running direction, one of its edges strikes the feeler which is situated a short distance therefrom. The feeler acts on the deflecting roller via the lever system. The deflecting roller is moved out of the position in which it is parallel to the axis of the drive roller in such a way that the belt is steered again into the center of the roller circumference.
Disadvantages of the known belt running centering means consist in its costly construction which comprises a plurality of articulations and is susceptible to disturbances from vibration and dirt, as well as the high wear on the lever system for the belt running centering means and on the sanding belt to be centered. A further disadvantage consists in the necessary adjustment of the known belt running centering means depending, for example, on elongation of the sanding belt caused by wear or as a result of the differences in length between different sanding belts when exchanging the latter.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a hand belt sander which avoids the disadvantages of the prior art and is a further improvement over the existing hand belt sanders.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a hand belt sander of the above mentioned type in which a swivel axle which supports a lever arm for sensing a position of the sanding belt sits in the guide plate, the control plate is fillable around the swivel axis together with the fork-shaped end and is lengthened toward the drive roller so as to form the swivel arm in one piece and also to carry a stop part.
When the hand belt sander is designed in accordance with the present invention, it has the advantage of a simple, robust and reliably operating construction with reduced wear of the centering device as well as of the sanding belt. The service life of the sanding belt is prolonged considerably. The work quality which can be achieved with hand belt sanders is improved. Work interruptions due to failure of the automatic belt running centering means and the manual adjustment which is subsequently necessary are eliminated. Particular advantages of the invention result from the compact, planar lever arrangement of the belt running centering means without support at the housing with only a single swivel axle. The invention meets the object of providing a sensitive and robust belt running centering means for a hand belt sander with few parts which are simple to produce, operate in a reliable manner and eliminate the need for adjustment after exchanging the sanding belt.
In accordance with another feature of the present invention the stop part is arranged at the outer edge of the sanding belt closely adjacent to the drive roller and the sanding plate.
Still another feature of the present in
REFERENCES:
patent: 4177609 (1979-12-01), Rameckers et al.
patent: 4584797 (1986-04-01), Wanninkhof
Ruess Albert
Stierle Peter
Walz Heinz
Parker Roscoe V.
Robert & Bosch GmbH
Striker Michael J.
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