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:
Nov. 21, 2000
Filed:
Dec. 04, 1998
Steven M Stojic, Holland, MI (US);
Holland Neway International, Inc., Muskegon, MI (US);
Abstract
A spring brake actuator being divided into a first spring brake chamber and a second spring brake chamber by a diaphragm extending across the actuator. A pressure plate is provided in the first spring brake chamber and rests on the diaphragm. A power spring is positioned between the spring brake chamber housing and the pressure plate to urge the pressure plate toward the bottom of the actuator housing. Pressurized air is supplied to the second spring brake chamber to hold the power spring in a compressed state. A normally closed one-way check valve extends through the pressure plate and the diaphragm to provide for temporary fluid communication between the first spring brake chamber and the second spring brake chamber upon the exhausting of pressurized air from the second spring brake chamber to thereby prevent the creation of a vacuum in the first spring brake chamber that might retard the application rate of the spring brake actuator.