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

• Current Assignee: Peter J.H. Prohaska
• Original Assignee: Peter J.H. Prohaska
• Inventors: Prohaska, Peter J. H.
• Primary Examiner(s): Larkin, George V.
• Application Number:
  US05/496,675
• Time in Patent Office: 428 Days
• Field of Search: 16/137,135,128R,148 292/DIG.17,300 49/383,381,398,399
• US Class Current: 49/383
• CPC Class Codes: E05D 11/0027 arranged on or near the hinge and comprising parts interlocking as the wing closes, e.g. security studs
• CPC Class Codes: E05D 2011/0036 near the hinge
• CPC Class Codes: E05Y 2900/132 Doors
• CPC Class Codes: Y10S 292/17 Hinge edge latches
• CPC Class Codes: Y10T 292/42 Rigid engaging means
• CPC Class Codes: Y10T 292/79 Bolt guards

Abstract

A security system prevents a door from being pulled from a doorframe after removal of the door hinge connection. When the door is closed, a stationary abutment projecting laterally into the door opening from the doorframe overlies a movable abutment affixed to the door. As the door opens, the movable abutment passes through an intermediate position where its extreme portion lies substantially parallel to the extreme portion of the stationary abutment. A method is disclosed for mounting the security system by positioning the stationary abutment against the door and positioning the movable abutment against the base of the stationary abutment member.

Claims

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.

2. The security system of claim 1 wherein the movable abutment surface is spaced about one-fourth to one-half inch from the stationary abutment portion when the door is in its closed position.

3. The security system of claim 1 wherein the extreme portion of the movable abutment surface abuts the base portion of the stationary member when the door is in a closed position.

4. The security system of claim 3 wherein the distance by which the outer portion of the movable abutment surface overlies the stationary abutment portion is substantially equal to the distance between the stationary abutment portion and the movable abutment surface when the door is in its closed position.

5. An assembly for preventing a door from being removed from a doorframe upon removal of a hinged connection between the door and the doorframe, comprising, a doorframe forming an opening, a door positioned in the opening of the doorframe, said door having a hinge connecting the door to the doorframe, said hinge having a hinge axis located on the exterior side of the door to permit movement of the door from a closed position where it lies parallel to the frame to an open position where it is angularly disposed to the frame to permit ingress and egress through the opening in the doorframe, the improvement which comprises a security system having a stationary member mounted on the frame on the interior side of the door and a movable member affixed to the interior face of the door, said stationary member having a base portion and a stationary abutment portion projecting from the base portion, said stationary abutment portion extending laterally from the doorframe into the opening on the interior side of the door, said movable member having a movable abutment surface which is in facing relationship to the interior side of the door and 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.

6. The security system of claim 5 wherein the movable abutment surface is spaced about one-fourth to one-half inch from the stationary abutment portion when the door is in its closed position.

7. The assembly of claim 5 wherein the door has a swinging edge opposed from the pintle, said swinging edge being spaced from the frame by a clearance distance measured parallel to the plane of the opening, said movable abutment surface overlying the stationary by a given lateral distance greater than said clearance distance, said given distance being measured parallel to the plane of the opening.

8. The security system of claim 5 wherein the extreme portion of the movable abutment surface abuts the base portion of the stationary member when the door is in a closed position.

9. The security system of claim 8 wherein the distance by which the outer portion of the movable abutment surface overlies the stationary abutment portion is substantially equal to the distance between the stationary abutment portion and the movable abutment surface when the door is in its closed position.

10. The assembly of claim 8 wherein the following relationship exists:

A2 + (B + C)2 is at least as great as B2 + (A + D)2;

where A is the distance from the hinge axis to the base portion of the stationary member, measured parallel to the plane of the opening of the doorframe;

B is the distance from the hinge axis to the interior face of the stationary abutment portion, measured perpendicular to the plane of the opening of the doorframe;

C is the distance between the exterior face of the stationary abutment portion and the movable abutment surface, measured perpendicular to the plane of the opening of the doorframe; and

, D is the distance between the base portion of the stationary member and the extreme portion of the stationary abutment portion, measured parallel to the plane of the opening of the doorframe.

11. The assembly of claim 5 wherein the stationary abutment portion of the stationary member abuts the interior face of the door when the door is in its closed position.

12. The assembly of claim 11 wherein the extreme portion of the movable abutment surface abuts the base portion of the stationary member when the door is in its closed position.

13. A method of mounting a security system on a door located in a doorframe, said security system having a stationary abutment attached to a base mountable on the doorframe, and a movable abutment mountable on the door to overlie the stationary abutment when the door is in its closed position and to swing with the door to a position laterally displaced from the stationary abutment, said mounting method comprising the steps of placing the door in its closed position, placing the stationary abutment in contact with the doorframe and the door in its closed position to establish the final position of the stationary abutment, affixing the base of said stationary abutment in its final position to the doorframe, placing the movable abutment in contact with the door and the bases of the stationary abutment to establish the final position of the movable abutment, and affixing the movable abutment in its final position to the door.