A FORCED-ENTRY GUARD FOR DOORS AND WINDOWS

Abstract: A forced-entry guard for doors and windows (13), comprising a tubular profile (19) which is angular in section and can be mounted along at least one of the frame sides (10), adjacent the gap between the frame and the door-leaf or the window-frame (12). The tubular profile (19) houses stiffening means (22) and in a nonvisible way one end of a number of screw means (20) which are intended for said mounting of said profile.

Description: Title: A forced-entry guard for doors and windows The present invention relates to a forced-entry guard for doors and windows, comprising a tubular profile which is angular in section and can be mounted along at least one of the frame sides, adjacent the gap between the frame and the door-leaf or the window-frame. Field of the invention: Housebreaking on doors and windows that open inward or outward according to above, is often performed in such a way, that a sharp tool is forced into the gap between the frame and the leaf or window-frame respectively, and a bending force is imposed upon the tool, until lock bolts, striking plate or the hinges yield. Objects of the invention: One object of the present invention is to provide an effec- tive forced-entry guard, which leads to a substantial strengthening protection against forced entry, without expensive arrangements. Summary of the invention: The above object is achieved by means of that the tubular profile houses stiffening means and in a non-visible way one end of a number of screw means which are intended for said mounting of said profile. Preferably, the tubular profile with one mounting side abuts the outside of the door-leaf or the window-frame and projects substantially perpendicular to said outside with at least one side, which is located adjacent the border of the door-leaf or the window-frame. According to one embodiment of the invention, the stiffe¬ ning means comprises a substantially flat reinforcement rail of steel, which has been entered longitudinally into the tubular profile, said rail being affixed diagonally with one of its longitudinal edges adjacent said mounting side and with its other longitudinal edge adjacent said first side of the profile which is distal to the frame. Alternatively, the stiffening means may comprise a diagonal web which can be integrally manufactured with the tubular profile by means of extrusion. Preferably, the tubular profile is internally provided with nut means for mounting bolts extending through the frame from its inner side. According to another embodiment of the invention, the tubu¬ lar profile is provided with a number of drill holes ar¬ ranged along the longitudinal direction of the profile, at opposite sides, said holes enabling the entrance of screws from the outside, for fastening the tubular profile on a frame, door- or window-leaf, and the tubular profile houses a U-shaped strip profile which is provided with a corre¬ sponding set of holes, and can be moved inside the tubular profile, from a first position enabling entering and tigh¬ tening of the screws, to a second position in which it covers the screw heads and can be secured in place. Brief description of the drawings: Fig. 1 is a section through a conventional window, which is subject to a forced-entry test, Fig. 2 is a corresponding section through a window having a guard according to a first embodiment of the invention, which in a similar way is subject to a forced-entry test, Fig. 3 shows in a side view shows a nut means used in the arrangement according to the invention, Fig. 4 shows the nut means in Fig. 3 in an elevation view, and Fig. 5 is a perspective view of a window having a guard according to a second embodiment of the invention. Description of preferred embodiments: The windows shown in Fig. 1 and 2 comprise a fixed frame 10, a pivotally on hinges 11 hinged window frame 12 and a set 13 of window panes. An espangnolette lock 14 is mounted at the opposite frame element 12a from the hinges 11, so that the lock may grip with a bolt 14a into a striking-plate in the frame 10. A sharp burglar tool 17 has been forced into the gap 16 between the fixed window frame 10 and the pivotal frame 12, in order to force the window open. The dotted line 18 illu- strates the angle of the resulting breaking force, which predominantly is directed outward. Fig. 2 shows a frame 10 which has been modified according to the invention. A tubular profile 19 of metal is rectang- ular in section and has been mounted with one side 19a against the outside of the frame, at least along three of the four frame elements and adjacent the corresponding borders of the window frame 12. The tubular profile 19 is provided with one side surface 19b near the border of the window frame 12, and is fastened by means of bolts 20, which have been entered from the inside of the frame via holes drilled in it, and screwed into nut means 21 within the tubular profile. In order to strengthen the metal profiles 19, which prefe¬ rably has been manufactured be means of extrusion of alumi¬ num, a steel rail 22 has been entered longitudinally in such way that is held diagonally between two opposite cor- ners of the tubular profile, with the edge 22a which is nearest to the gap 16 facing outward from the frame, and the other edge 22b facing inward. Alternatively, this strengthening could be achieved by extruding the tubular profile with an integral diagonal web. As in Fig. 1 a sharp burglar tool 17 has been forced into the gap 16 between the fixed frame 10 and the pivotally hinged frame 12, with the intention of forcing the window open. The arrow 23 illustrates the angle of the. resulting force, and its clear that the angle is pointing much less outward than the angle shown in Fig. 1. The reason for this is that the pivot point of the burglar tool has been moved transversely outward, resulting in that the breaking force will almost totally be absorbed by the opposite frame member, i.e. at the hinge side. The tubular profile 19 mounted at the hinge side, is pro¬ vided with countersunk recesses 19a for the hinges 11, so that these are about halfway recessed into the profile. This will act to prevent attacks onto the hinges. Fig. 3 and 4 show a nut means 21, which is known from the Swedish patent application 8702650-6, and comprises a L- for ed steel fitting. This is provided with a threaded hole 24 and a second hole 25 for a blind rivet 26. A set of holes for the nut 21 will be drilled in the frame surface side of the tubular profile 19, including a rectangular hole 27. That limb of the nut which is provided with the holes is inserted into the tubular profile via the hole 27, it is turned out towards the inside of the profile wall and affixed by means of blind riveting. Then that limb 21a which projects out of the hole 27 is broken off, as is shown in Fig. 3. Fig. 5 shows a second embodiment of the invention, wherein the same numerical references have been used on correspon- ding parts as in earlier figures. The tubular profile 19 is provided with a number of drill holes 28, arranged along the profile, at opposite surfaces 19a and 19c respectively, said holes permitting entering of attachment screws 20 from the outside. The tubular profile 19 also contains a U-sha- ped strip profile 29 which has a corresponding set of ho¬ les, and can be moved within the profile from a first posi¬ tion in which the screws 20 can be inserted through both sets of holes and tightened, and a second position in which it covers the screw heads. The strip can be locked in this position by means of a one way screw. The forced entry guard according to the invention may be used at frame and blade constructions made of wood, alumi¬ num or steel. At doors or windows opening inward, the tubu- lar profile will be mounted on the door blade or the window frame 12. The invention is not limited to the above described embodi¬ ment, but several variations are possible within the scope of the accompanying claims. For example, the tubular pro¬ files 21 may be three-sided. Naturally, the invention may be applied to other types of windows than pivotally hinged, e.g. sliding windows.

Claims: Claims: 1. A forced-entry guard for doors and windows (13) , comprising a tubular profile (19) which is angular in sec- tion and can be mounted along at least one of the frame sides (10) , adjacent the gap between the frame and the door-leaf or the window-frame (12), c h a r a c t e r ¬ i z d i n that *he tubular profile (19) houses stiffe¬ ning means (22) and in a nonvisible way one end of a number of screw means (20) which are intended for said mounting of said profile. 2. A forced-entry guard as in claim 1, c h a r a c t e r i z e d i n that the tubular profile (19) with one mounting side (19a) abuts the outside of the door-leaf or the window-frame and projects substantially perpendicular to said outside (10) with at least one side (19b) , which is located adjacent the border of the door- leaf or the window-frame (12) . 3. A forced-entry guard as in claim 2, c h a r a c ¬ t e r i z e d i n that the stiffening means comprises a substantially flat reinforcement rail (22) of steel, which has been entered longitudinally into the tubular profile (19) , said rail being affixed diagonally with one of its longitudinal edges (22b) adjacent said mounting side (19a) and with its other longitudinal edge (22a) adjacent said first side (19b) of the profile which is distal to the frame. 4. A forced-entry guard as in claim 2, c h a r a c ¬ t e r i z e d i n that the stiffening means comprises a diagonal web (22) which is integrally manufactured with the tubular profile by means of extrusion. 5. A forced-entry guard as in claim 3 or 4, c h a r a c t e r i z e d i n that the tubular profile (19) internally is provided with nut means (21) for moun¬ ting bolts (20) , extending through the frame (10) from its inner side. 6. A forced-entry guard as in claim 1 or 2, c h a r a c t e r i z e d i n that the tubular profile (19) is provided with a number of drill holes (28) arranged along the longitudinal direction of the profile, at oppo¬ site sides, said holes enabling the entrance of screws (20) from the outside, for fastening the tubular profile on a frame, door- or window-leaf, and that the tubular profile (19) houses a U-shaped strip profile (29) which is provided with a corresponding set of holes, and can be moved inside the tubular profile, from a first position enabling ente¬ ring and tightening of the screws (20) , to a second posi¬ tion in which it covers the screw heads and can be secured in place.

Inventors: ANDREASSON KURT, ANDREASSON, KURT
Applicants: ANDREASSON KURT, ANDREASSON, KURT
Application year: 1989
Main classification: E06B1
IPC codes: E06B5