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:
Oct. 26, 1993
Filed:
Jul. 20, 1992
Applicant:
Inventor:
John M Graham, San Mateo, CA (US);
Assignee:
Other;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B60T / ;
U.S. Cl.
CPC ...
303-601 ; 303-9 ; 303-976 ; 188170 ;
Abstract
A brake system (2) uses a multi chamber brake actuator (6), including a service brake actuator (8) and a spring brake actuator (80), coupled to an air brake by a slack adjustor (122). The spring brake actuator is configured to pull on, instead push on, the push rod (120). In some embodiments (6b, 6c) the spring brake actuator applies a lower level parking brake force or a higher level emergency brake force.