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:
Jul. 12, 1977
Filed:
Aug. 27, 1975
Malvin P Pettersen, Cicero, IL (US);
Richard G Merrell, Darien, IL (US);
Other;
Abstract
The disclosure relates to a safety device for use in a garage door opening and closing system of the type which includes an impulse actuated reversible motor which opens and closes the garage door and wherein the safety device automatically actuates the motor for closing the door should the door be inadvertantly opened or accidentally remained open. The safety device includes a detector for detecting the open or closed condition of the door, a counter for keeping time responsive to the detector detecting that the door is open, and a logic circuit for providing repetitive impulses to the motor to actuate the motor for closing the door. The counter terminates keeping time and is reset by the detector when the detector detects that the door is closed. The safety device additionally includes an indicator responsive to the repetitive impulses for indicating that the logic circuits have actuated the motor for closing the door.