Appeal No. 1999-1912
Application No. 08/730,724
86 is in the tightened state” (col. 9, lines 51-55). Rudolf’s
Figure 2 embodiment is similar to the Figure 1 embodiment,
except for the addition of a piston ring 130 and Belleville
washer springs 132 at the base of the cavity 134. With this
enhancement,
tightening of the retaining screw 86 is not
delimited by the elasticity of the plastic substance
but instead upon further tightening, the Belleville
washers 132 are first compressed until the piston
ring 130 is supported by the stepped surface 38 via
the compressed Belleville washers 132. Only after
that does slight compression of the plastic
substance . . . occur in order to achieve final
clamping of the grinding disc 22. [Col. 10, lines
25-30.]
Krüsi pertains to a device for cutting wooden beams to
length, and would appear to be the most pertinent of the
references applied by the examiner against the claims. Of
particular interest is Figure 6, which shows a cross section
of the drive mechanism for the saw, and Figure 7, which shows
open
and closed perspective views of a chuck for holding the
tapered shank 19 of a saw blade holder. The chuck of Krüsi
comprises a conically shaped recess for receiving the tapered
shank of the saw blade holder and a expandable bushing 21
5
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