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:
Jan. 25, 1983
Filed:
Jan. 14, 1981
Alfred Klatt, Wathlingen, DE;
Gunther Singbartl, Hanover, DE;
WABCO Fahrzeugbremsen GmbH, Hanover, DE;
Abstract
A vehicle door control valve device having a pair of two-way, electro-magnetically operated, pneumatic valve members arranged so that one valve member is operated to a first position, in which compressed air is supplied to one side of a pneumatic actuator that operates the door, while concurrently, a second identical valve member is operated to an opposite position, in which compressed air is exhausted from the other side of the pneumatic door actuator. The relative positions of the respective valve members may be alternately switched to effect door opening and closing. Operation of the valve members is electro-magnetically controlled by primary and secondary coils arranged to cooperate with a permanent magnet, so that only momentary energization of the coils is necessary to effect switching of the valve members. The arrangement is such that in the case of an emergency, opposite sides of the pneumatic door actuator are both de-pressurized to permit manual door operation.