Appeal No. 2005-2398
Application No. 09/899,029
The brake mechanism 70 corresponds to a diameter
expansion type drum brake. The brake mechanism 70 is
constituted by a brake cover 71, brake shoes 73 and 73
with brake pads mounted to the brake cover 71 through a
bush 72, a cam 74 expanding the diameters of the brake
shoes 73 and 73, a cam lever 75 rotating the cam 74, a
brake cable 76 drawing the cam lever 75, a brake drum
77 surrounding the brake shoes 73 and 73, and tensional
springs 78 and 78 compressing the diameters of the
brake shoes 73 and 73. The brake cable 76 is connected
to the brake lever 12 in FIG. 1.
A rotation of the brake drum 77 is braked by the
brake shoes 73 and 73 by mounting the brake drum 77 to
the middle shaft 54 shown in FIG. 6 and mounting the
other brake cover 71 and the brake shoes 73 and 73 to
the lid 59, so as to stop the motor-assigned single-
wheel cart 1.
Although Miyazaki employs a brake lever 12, rather than a twist-
type brake control handle, to pull a brake cable 76 to operate a
brake drum, Krauer teaches that either a twist-type brake control
handle or a lever-type brake control is known to be used with a
brake cable to operate brakes. See column 1, lines 16-68 and
column 7, lines 14-35. Krauer goes on to state disadvantages of
using the lever-type brake control at column 1, lines 27-43, and
recommend its improved “twist grip brake control handle” at
column 2, lines 19-25. Krauer further teaches that this twist
grip brake control handle, which is described in the context of a
bicycle, can be used in “other cable operated devices, and more
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