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:
May. 22, 1979
Filed:
Jun. 12, 1978
Edward L Raymond, Minneapolis, MN (US);
Other;
Abstract
A security device used to check a door in a partially open position to prevent unauthorized entrance into a room having a doorway normally closed by the door. The security device has an anchor assembly, including a lag bolt secured to the door frame adjacent the door knob when the door is in a closed position. The lag bolt has a body carrying a head located outwardly from the frame. A rigid ring having an inside diameter slightly greater than the diameter of the door knob is attached to the anchor assembly with a link chain. The link chain has an anchor link surrounding the body of the lag screw and a ring link extended through the ring. A spacer sleeve surrounding the body of the anchor assembly holds the anchor link adjacent the head spaced from the frame and casing of the doorway. The intermediate chain links connecting the anchor link with the ring link are surrounded with a sleeve. The sleeve is located in a tight engagement with the intermediate links and allows for free movement of the anchor link and ring link.