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:
Sep. 04, 1984
Filed:
Nov. 06, 1981
Christian Grabner, Gechingen, DE;
Klaus-Jurgen Heimbrodt, Boblingen, DE;
Dieter Feichtiger, Aidlingen, DE;
Abstract
A pneumatic central locking system for doors and/or lids in motor vehicles, with a pneumatic operating or locking element being provided for each lock mechanism of the doors and/or lids so as to enable the same to be locked and unlocked. An electrically drivable air pump is connectible with the locking elements by a line system and a selector valve is disposed at an outlet side of the air pump. The selector valve acts upon the line system and/or the locking elements in a desirable manner by means of an additional pneumatic operating or switching element connected fluidically in parallel at the locking elements. A response pressure of the switch element is higher than that of the locking elements. At least one lock mechanism contains a key operable first selector switch, with a second selector switch which may be operated by the switching element. Both of these selector switches are connected by power leads to the electric drive for the air pump and are connected electrically in series with one another in such a fashion that when the central locking system is in a steady state, the power to the electric drive is interrupted. In addition to a pressure dependent actuation of the second selector switch, the switching element also provides an additional operating drive for the second selector switch which responds as a function of time.