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. 21, 1982
Filed:
Jun. 09, 1980
Applicant:
Inventor:
Horst Tillmann, Ennepetal, DE;
Assignee:
Dorma-Baubeschlag GmbH & Co. KG, Ennepetal-Voerde, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E05F / ;
U.S. Cl.
CPC ...
16 53 ; 16 58 ;
Abstract
An automatic door closer in which a piston operatively connected to the door to be moved in axial direction during turning of the door in either direction from a closed to an open position divides the fluid filled housing of the door closer into two pressure compartments which are connected by two channels in which adjustable throttles are arranged to dampen the movement of the door or to be completely closed to prevent passage of fluid through the channels to hold the door in any open position.