The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 12, 1988
Filed:
Jul. 06, 1987
Applicant:
Inventors:
Paul D Agarwal, Troy, MI (US);
Robert J Hammersmith, Rochester Hills, MI (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B60T / ;
U.S. Cl.
CPC ...
1881 / ; 188216 ; 303100 ;
Abstract
A brake system actuator which is actuated to increase pressure delivered to a wheel brake through a drive transfer mechanism powered by a variable torque electric motor, the actuator piston being retracted by a substantially constant torque spiral spring which is preloaded to drive transfer means in the opposite direction when the motor is deenergized. This is particularly useful in a brake actuator which is a component of a vehicle wheel brake and wheel anti-lock control system.