Appeal No. 1999-1912
Application No. 08/730,724
Rudolf, the device includes a tool spindle 20 driven by a
motor 10 through drive gears 14, 16. The grinding disc 11 is
held between a flange 24 of the tool spindle and a circular
disc shaped screw head 92 of a retaining device 84. Screw
head 92 has a cylindrical piece 96 extending therefrom that
carries a threaded bolt 88. This bolt is received within the
threaded end of a clamping anchor 46, which clamping anchor is
in turn carried within a hollow portion of the tool spindle.
The clamping anchor 46 and the tool spindle 20 cooperate to
form cavities 56 and 70 connected by connecting channels 66.
The cavities and connecting channels are filled with a plastic
substance such a polyvinyl chloride with a relatively low
degree of polymerization (col. 9, lines 25-29). When the bolt
88 of the screw head 92 is threaded into the threaded end of
the clamping anchor to clamp the grinding disc between the
flange 24 and the screw head 92, the
volume of the cavities 56 and 70 decreases, thus compressing
the plastic substance (col. 9, lines 29-55). The plastic
substance “serves as elastic element which is volume-
compressible within certain limits and thereby allows the
grinding disc 22 to be held clamped when the retaining screw
4
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Last modified: November 3, 2007