Motor vehicle brake detector

• US 5,302,940 A
• Filed: 10/05/1992
• Issued: 04/12/1994
• Est. Priority Date: 10/05/1992
• Status: Expired due to Fees

• Current Assignee: Chi-Shan Chen
• Original Assignee: Chi-Shan Chen
• Inventors: Chen, Chi-Shan
• Primary Examiner(s): Peng, John K.
• Assistant Examiner(s): TONG, NINA C
• Application Number:
  US07/956,266
• Time in Patent Office: 554 Days
• Field of Search: 340/454, 340/453, 340/449, 200/61.4, 188/1.11
• US Class Current: 340/454
• CPC Class Codes: B60Q 1/441 Electric switches operable by the driver's pedals
• CPC Class Codes: F16D 2065/783 cooling control or adjustment
• CPC Class Codes: F16D 2066/001 Temperature
• CPC Class Codes: F16D 65/78 Features relating to cooling
• CPC Class Codes: F16D 66/00 Arrangements for monitoring working conditions, e.g. wear, temperature
• CPC Class Codes: F16D 66/024 Sensors mounted on braking members adapted to contact the brake disc or drum, e.g. wire loops severed on contact

Abstract

A motor vehicle brake detector is fastened in the brake shoe of a motor vehicle brake assembly and connected to a warning control circuit including a thermo resistor on the instrument board of the motor vehicle to give warning signals in terms of light intensity of an indicator lamp of the warning control circuit as the brake assembly was overheated during a brake or the brake shoe of the brake assembly was damaged to increase temperature of the thermo resistor and decrease the resistance of the thermo resistor, thereby increasing the light intensity of the indicator lamp for warning purpose.

Claims

1. A motor vehicle brake detector comprising a blind hole formed in a brake shoe of a motor vehicle brake assembly, a thermo sensor packed by an insulator fastened inside said blind hole and connected to a warning control circuit for permitting said warning control circuit to give warning signals as said brake assembly was overheated during a brake or said brake shoe of said brake assembly was worn off;

said thermo sensor including a metal sleeve connected to one end of said warning control circuit by a first conductor, and a thermo resistor received inside said metal sleeve and having an output terminal extended outwardly and welded to said metal sleeve and an input terminal connected to an opposite end of said warning control circuit by a second conductor; and

said warning control circuit including an indicator lamp electrically connected with said thermo resistor in series in between said first and said second conductors of said thermo resistor, whereby upon increasing of temperature of said brake assembly, said thermo resistor will decrease its resistance and increase its negative voltage to thereby increase a light intensity of said indicator lamp for warning purpose.