Appeal No. 1997-3709
Application 08/582,034
dimension of the inner end of the passageway is less than the
circumferentially extending dimension of the outer end of the
passageway (i.e., (B3) < (A3)). It is not possible to
determine the cross-sectional shape of Wirth’s passageway.
Thus, Wirth must be considered to be silent as to whether
passageway 6 has outer and inner ends such that (A2) < (A1)
and such that (B2) < (B1).
Herbulot relates to a vented brake disk comprising an
annular friction plate having radially oriented ventilation
channels. At column 1, lines 9-13, Herbulot states that
conventional brake discs are delineated by ventilation
channels each having a continuous inner wall. According to
Herbulot, the cooling obtained by this arrangement is often
not completely satisfactory. Accordingly, Herbulot proposes a
brake disc
characterised [sic, characterized] in that, as
regards at least some of the ventilation channels,
the channel is divided longitudinally into at least
two portions separated by a step causing an abrupt
discontinuity of cross-section.
With such an arrangement, the aerodynamic
conditions of flow of the air in the channels are
doubtlessly less satisfactory than in the case where
the inner wall delimiting the channel is continuous,
but the effect of the turbulence generated by the
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