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:
May. 31, 1994
Filed:
Oct. 26, 1990
Applicant:
Inventor:
John A Urban, Plainwell, MI (US);
Assignee:
Lucas Industries public limited company, West Midlands, GB;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16D / ;
U.S. Cl.
CPC ...
188325 ; 188 7955 ;
Abstract
A brake actuator has a housing containing tappets operable by a cam to apply brake shoes against a rotary brake drum. The housing defines a cavity to which lubricant is admitted. A flexible element which is not compressed at the maximum positive system lubricant pressure and is disposed within the cavity and subject to lubricant pressure. The element is movable during outward movement of the tappets to compensate for any increase in volume of the cavity caused by tappet outward movement. This avoids the occurrence of negative pressure in the cavity.