Closure fasteners – Extension link – Chain
Patent
1978-06-12
1979-05-22
Foss, J. Franklin
Closure fasteners
Extension link
Chain
70 49, E05C 1736
Patent
active
041555775
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.
REFERENCES:
patent: 186319 (1877-01-01), Dietz
patent: 878607 (1908-02-01), Cairns
patent: 890518 (1908-06-01), Kleidmann
patent: 2367039 (1945-01-01), Lally et al.
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