Appeal No. 1998-1533 Page 6
Application No. 08/411,202
Independent claim 1 reads as follows:
A disc brake assembly having a pair of brake shoes
each with a friction pad member to be pressed into
contact with a disc rotor having a circumferential length
secured for rotation with a road wheel of an automotive
vehicle, wherein upon contact with the brake shoes, the
disc rotor oscillates at a three-nodes diametric mode,
wherein each friction pad member of said brake shoes
has an upper portion with a total width determined to be
less than substantially 1/12 of the circumferential
length of said disc rotor at a position where said rotor
is brought into frictional engagement with the upper
portion of said friction pad member so that the friction
pad member reduces oscillation frequencies of said disc
rotor so that occurrence and level of brake noises
noticeably decrease.
Tarter's invention relates to a disc brake having first
and second pads whose surface area that engages a rotor has an
arcuate length that is less than that which would excite
certain nodes of vibration of the rotor to substantially
eliminate the creation of undesirable noise. As shown in
Figures 1 and 2, a disc brake 10 includes a rotor 12 with a
hub 14 that is carried on bearings 16 and 18 on shaft or axle
20. A generally C-shaped caliper 28 surrounds rotor 12 and is
secured to support 26 by an anchor plate 27. Caliper 28 has a
front or outboard leg 30 and a rear or inboard leg 32
interconnected by a bridge portion 34. The inboard caliper
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