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:
Feb. 09, 1982
Filed:
Oct. 30, 1979
Applicant:
Inventor:
Emanuel L Logan, Jr, Silver Spring, MD (US);
Assignee:
Reliable Security Systems, Inc., Cockeysville, MD (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E05C / ;
U.S. Cl.
CPC ...
292263 ; 292 92 ;
Abstract
Opening of a door, such as an emergency exit door, is delayed by a door check, the operation of which has been reversed to delay opening of the door instead of delaying closing of the door. The delay is accomplished by a circuit which includes a normally open valve held closed by a solenoid. When the solenoid is de-energized, the circuit is opened allowing the reversed door check to operate so that the door can be opened. The solenoid is controlled by an electrical timing circuit which is started by a switch connected to a door operator such as a push bar.