Clamping device for axially clamping of a tool, especially a dis

Details Clamping device for axially clamping of a tool, especially a dis Clamping device for axially clamping of a tool, especially a dis

1990-12-13

1993-01-05

Parker, Roscoe V.

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

B24B 4500

Patent

active

051759632

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a clamping device for the axial clamping of a tool, especially a disc, on a flange of a driven spindle, and comprising a clamping nut that is screwed on a threaded end shank of the spindle, and a clamping disc arranged between the tool and the clamping nut for biasing the tool against the flange. Clamping devices of this type have proved successful. The advantages afforded thereby are adduced in P 37 05 638. In these devices, the stops against which the rolling bodies, on one hand, and the springs, on the other hand, abut still require relatively complicated and, in terms of their production, expensive parts when provided either on the clamping disc or the clamping nut. These would have to be produced, for example, as sintered parts or extruded parts. However, where sintered parts are concerned, this presents problems for reasons of strength and, as with regards to extruded parts, there is great expense because of the re-working required. Where the supporting bodies rest on the clamping nut and clamping disc and are supported axially, hardened surfaces are desirable in order to reduce the wear and obtain a long lifetime. The hardening of the clamping disc or clamping nut in this region would likewise involve a high outlay and be expensive.


SUMMARY OF THE INVENTION

The object of the invention is a clamping device of which the individual parts, especially the clamping nut and/or clamping disc, can be designed more simply and therefore produced more simply and more cost-effectively.
The object of the invention is achieved by providing a device in which supporting bodies are arranged between the clamping nut and the clamping disc with each having a guide track; and there is provided an actuating member located between the clamping nut and the clamping disc and defining guide track means and radial recesses opening into the guide track means, rolling bodies are displaceable along guide paths defined by guide tracks of the supporting bodies and the guide track means for radially loading the supporting bodies, and an insert member is supported between the clamping nut and the clamping disc and includes a plurality of stops projecting into the guide paths. The actuating member presses the rolling bodies against the stops upon rotation in a first direction corresponding to a clamping direction, and displace the rolling bodies into associated radial recesses upon rotation in a second direction opposite to the first direction. Thereby the supporting bodies are relieved from radial loads and the clamping disc is relieved from an axial clamping pressure.
The clamping device according to the invention has the following advantages. The separate insert part, for example designed as a sheet-metal formed part at the same time, for example, as a sheet-metal stamped part, is simple and cost-effective. The individual elements required can be formed in this insert part quickly and cost-effectively. The insert part is so designed that it rests and is supported axially either on the clamping disc or on the clamping nut. This affords the precondition that segments of this insert part form, on their top side, the supporting surface, on which the supporting bodies rest and are supported by their confronting oblique supporting surface. At least these segments of the insert part which carry the supporting surfaces can be hardened, so that these supporting surfaces have a long lifetime. On one hand, the respective stop, on which a rolling body on the one hand and the confronting end of the spring on the other hand is supported, is worked out of the insert part, for example sheet-metal formed part. The retention parts ensuring a retention in the circumferential direction of the insert part in relation to the clamping disc or clamping nut can also be formed from the insert part, for example in the form of cut-out and bent noses. The positioning members which position the individual supporting bodies in the circumferential direction and keep them at a distance from one another can a

REFERENCES:
patent: 4525097 (1985-06-01), Ziegelmeyer
patent: 5042207 (1991-08-01), Kirn

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