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Door security system and method of attaching it

  • US 3,911,622 A
  • Filed: 08/12/1974
  • Issued: 10/14/1975
  • Est. Priority Date: 08/12/1974
  • Status: Expired due to Term
First Claim
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1. A security system for preventing removal of a hinged door from an opening in a doorframe upon removal of a hinge connection between the door and the doorframe, said security system comprising, a stationary member having a base portion and a stationary abutment portion projecting from the base portion, means for mounting the base portion of the stationary member on a doorframe interiorly of the door at a position where the stationary abutment portion extends laterally from the doorframe into the opening on the interior side of the door, a movable member having a movable abutment surface which is in facing relationship to the interior side of the door, means for mounting the movable member on the interior face of a door at a position fixed with respect to the door where the movable abutment surface overlaps the interior side of the stationary abutment portion when the door is in its closed position to prevent the hinged edge of the door from being pulled in an exterior direction when the hinge connection is removed therefrom;

  • said movable abutment surface being movable with the door upon opening of the door from a closed position, past an intermediate position where the spacing between said stationary abutment portion and the movable abutment surface is at a minimum, to a door-open position laterally displaced from the stationary abutment, said abutment surfaces having extreme portions which lie substantially parallel to each other when the door is at said intermediate position.

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