Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1989-07-24
1991-08-27
Rachuba, Maurina
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51170PT, B24B 4104
Patent
active
050422073
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Prior Art
My invention relates to a clamping device or chuck for axially clamping a tool, especially a disk.
A clamping device for clamping a tool to a flange on a driven spindle is known comprising a clamping nut, which can be screwed on a threaded spindle portion of the spindle on its free end, and a clamping disk which is arranged axially between the tool and the clamping nut, is supported at the clamping nut and can press against the tool and press the latter against the flange. Such clamping devices are chiefly suitable for portable hand-held machine tools and particularly for grinding machines. A clamping device of the aforementioned type is known (DE-PS 30 12 836) in which the clamping disk consists of an element which is approximately hat-shaped in cross section and is supported axially against the flange of the clamping nut via a helical spring. In screwing on and tightening the clamping nut, this clamping disk is pressed axially against the tool via the axially compressed spring, and the tool is accordingly tightened against the flange on the spindle side. The front side of a cylindrical shoulder of the clamping nut comes into immediate contact at a facing axial side of the flange on the spindle side and, if the clamping nut is tightened further, the flange on the spindle side is tightened together with the clamping nut, possibly until the rear flange comes into contact axially at the shoulder surface of the spindle forming the supporting element. It is to be achieved by means of this, in an angle grinder, that the grinding disk is clamped with defined contact pressing pressure and that this contact pressing pressure is ensured. This clamping device is also supposed to make it possible to exchange the grinding disk quickly and simply and simultaneously to prevent an overloading of the hand-held machine tool, particularly the angle grinder. That is, if the torque acting on the grinding disk is too great, the grinding disk stops, while the rear flange and the clamping nut, with the clamping disk, execute a relative movement thereto. This clamping device counters the effect whereby the clamping nut continues to tighten by itself during operation, which would otherwise considerably impede the loosening of the clamping nut when changing the grinding disk. Nevertheless, it is only possible to loosen the clamping nut with the use of a special auxiliary tool, wherein the spindle must be held reciprocally by means of a second auxiliary tool, e.g. a wrench, depending on the design of the machine.
SUMMARY OF THE INVENTION
Accordingly, it is an object of my invention to provide an improved clamping device for axially clamping a tool which may be loosened in a quick and reliable manner for exchange of tools.
It is also an object of my invention to provide an improved clamping device for axially clamping a tool which may be converted without special rebuilding.
In keeping with these objects and with other which will become apparent hereinafter, the clamping disk is coupled with the clamping nut so as to be axially displaceable but fixed with respect to rotation relative to it and is axially supported by a plurality of rolling bodies guided on tracks of the clamping disk and the clamping nut. An actuating member acting on the rolling bodies is arranged between the clamping disk and the clamping nut and presses the rolling bodies against stops of the clamping disk in one direction corresponding to the tightening direction and in the opposite direction moves them along the tracks until at respectively assigned axial and/or radial cut out portions which open into the tracks thus relieving the clamping disk from clamping pressure.
There are several possible embodiments of my invention. Advantageously there are three rolling bodies distributed equidistant circumferentially and the rolling bodies are balls. The actuating member may consist of a ring which is arranged axially between the clamping disk and the clamping nut and is held so as to be rotatable relative thereto and the rin
Rachuba Maurina
Robert & Bosch GmbH
Striker Michael J.
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