Appeal Number: 2006-1059
Application Number: 09/780,603
abutting relationship on a transversely extending axle (44). As
noted in column 3, lines 33+, each roller segment is formed in
two concentric portions, a soft outer portion (64) and a hard
inner portion (66), which portions provide a relatively hard,
friction reducing surface at each roller segment’s inner
periphery contacting the base (46) of axle (44) and a relatively
soft surface at its outer periphery that increases frictional
contact between the roller and the surface to be cleaned so as
to ensure rolling action of each segment of the dust seal when
polished floors are swept. Block goes on to note that the inner
core portion (66) is formed of a rigid vinyl material having a
Shore D hardness of 65-75, while the outer portion (64) is
formed of a softer vinyl material having a Shore A hardness of
40-50 (col. 3, lines 64-68).
From the teachings of Block, the examiner contends that it
would have been obvious to one of ordinary skill in the art at
the time of appellant’s invention to have designed the wheel
assemblies on the creeper of Miles, as modified by Bonzer, with
a hardness of 65-75 Shore D, as taught by Block, in order to
prevent wear.
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