Appeal No. 2005-0993 Page 5
Application No. 10/056,156
approaching a skid condition. Figure 2 is an illustration of the antiskid system applied to
a drum braking system. The vehicle's pressurized brake system is activated by a
control element, illustrated as a foot pedal 16, which the operator depresses when he
desires to stop the vehicle. The mechanical force applied to the foot pedal is
communicated to a brake pressure generator 30 which may be a direct
mechanical-to-pressure converter or may be anyone of the several power assisted
systems well known in the art. The pressure generator 30 in response to actuation of
the foot pedal 16 increases the pressure in a brake cylinder 32 urging an internal piston
(not shown) to move outwardly displacing a brake shoe 34 toward the brake drum 36 by
means of a mechanical link 38. The drum 36 is fixedly attached to the wheel and
rotates therewith while the shoe 34 is pivotably attached to a stationary element of the
wheel assembly, such as the axle housing, and has a stationary relationship to the
rotating wheel. Displacement of the shoe 34 causes a brake pad (or lining) 40 fixedly
attached to the shoe 34 to frictionally engage the rotating drum 36. The friction
caused by the engagement of the pad with the drum absorbs the energy of the
rotating wheel causing the rotational speed of the wheel, and therefore the
vehicle, to slow down.
Blatter's system includes a control logic 14 that responds to signals generated by
wheel sensors 12 indicative of the rotational speed of each wheel, senses an imminent
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