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:
Apr. 18, 1989
Filed:
May. 11, 1987
Applicant:
Inventors:
Henning N Kornbrekke, Burlington, CT (US);
Anthony R Ranaudo, Naugatuck, CT (US);
Assignee:
The Stanley Works, New Britain, CT (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E05F / ;
U.S. Cl.
CPC ...
250341 ; 250221 ; 49 25 ; 340545 ;
Abstract
A threshold safety sensor for a sliding door system employs infrared transmitters and a photo diode for detecting traffic at or near the threshold of a sliding door system. The transmitters are pulsed in a time spaced sequence. An input signal derived from the operate initiating signal of the automatic door operator is employed for enabling a latch. The latch sets a relay to a state for maintaining the doors in an open position when traffic is detected in the sensor detection zone.