Appeal No. 2002-0816
Application No. 09/442,895 Page 10
arrangement to tangentially and axially fix a brittle magnet body
on a shaft such that the magnet body will remain on the shaft
even after long and rough operation, without exerting forces on
the magnet body which could lead to cracking, such that the axial
position of the magnet body can be adjusted. ” To overcome the
disadvantages of the prior art, Knappe discloses (col. 4, lines
7-15) a magnet carrier in the form of a plastic bushing 4 which
has been placed on the rotor shaft 2, and which carries the
magnet body 3. Snap hooks 41, 42 of the plastic bushing extend
through corresponding grooves 31, 32 in the magnet body 3 and
engage the left end side of the magnet body 3 (col. 4, lines 12-
14). Thus, we find that Knappe discloses attaching a bushing to
the rotor shaft and attaching the magnet 3 to the bushing instead
of attaching the magnet 3 directly to the rotor shaft. From the
disclosure of Knappe, we find that an artisan would have been
taught to have connected magnet 7 of Shirakawa to a magnet
carrier instead of attaching magnet 7 directly to the rotor, as
taught by Knappe.
Turning to Carrier, we find that Carrier relates to (col. 1,
lines 5-8) an electric motor with a frequency generator for
producing a signal indicative of motor speed. Rotor 10 includes
an annular field magnet 28 that is rigidly attached to housing 22
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Last modified: November 3, 2007