Measuring and testing – Brake testing
Patent
1995-11-17
1998-05-19
Dombroske, George M.
Measuring and testing
Brake testing
340453, G01M 1500
Patent
active
057538077
ABSTRACT:
A brake adjustment monitoring system, including a sensor having a movable actuator for mounting in or on a brake service chamber and circuitry which responds to the actuator's position to generate a display indicating whether the brake is correctly adjusted (after actuation of the brake). In preferred embodiments mounted in a motor vehicle having several brake assemblies each including a service chamber, a sensor is mounted in each service chamber, and a display panel mounted to the dashboard indicates the status of each brake assembly or each pair of the brake assemblies. Preferably, each sensor is designed for use with an air brake assembly including a service chamber, a push rod having one end outside the chamber and another end in the chamber, and a slack adjuster connected to the push rod's outer end. In response to air pressure in the service chamber (produced in response to actuation of the vehicle's brake pedal), the push rod's outer end translates away from the chamber (with an adjustable maximum travel distance). One sensor is mounted through the wall of the chamber, with an actuator positioned in the chamber in the path that a brake element (e.g., a diaphragm plate connected to the push rod) follows when the brake is applied. If the brake is improperly adjusted, the brake element travels sufficiently far, with full brake application, that it engages the actuator (thereby causing the display to indicate improper adjustment of the brake assembly). If the brake assembly is properly adjusted, the brake element does not engage the actuator (and the display indicates proper adjustment of the brake assembly).
REFERENCES:
patent: 1612928 (1927-01-01), Langbein
patent: 2449091 (1948-09-01), Starling
patent: 3648511 (1972-03-01), Groat et al.
patent: 3995475 (1976-12-01), Cline
patent: 4062224 (1977-12-01), Zeleney
patent: 5522259 (1996-06-01), Schmidt et al.
One page advertisement by HS&S Products, entitled "Air Brake Adjustment Indicators Brak Chek" (May 1995).
One page advertisement by Brake Alert, Inc. entitled "Introducing Brake Alert" (May 1995).
Spero Theodore P.
Trueman Wayne
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