A DEVICE FOR CONVENTIONAL WOODEN DOORS

Abstract: A conventional wooden door (1) is generally provided with a handle (29) activating a latch from closed to open position and a latch knob (30) activating a bolt between closed and open position. The latch and bolt enter recesses provided in the frame flange (15) and for this reason it is relatively easy to break open a door (1). This is made more difficult if a parallel-epipedic body (2) is arranged on the inside of the door, said body (2) being provided with spring bolts (17 and 18) and dowels (23 and 24) to fit into recesses (19, 20) in the relevant jambs (16, 11, respectively).

Description: A device for conventional wooden doors The present invention relates preferably to doors made of wood and used as "N entrance doors and as apartment frontdoors. In such doors striking plates < are used beside the bolts to prevent a locked door from being broken up. On the hinge side of the dowels are generally used which may be located in the door itself or in the opposite frame part. The purpose of these dowels is also to make breaking-in more difficult. Despite these deter¬ rents it is still" possible to destroy a locked door, enabling illicit entry. In order to make this more difficult, doors have been made entirely of sheet metal and such doors certainly prevent undesired entry through the doorway. However, a metal door is considerably more expensive than a wooden door and it is thus not always feasible to replace a wooden door by a metal one. The object of the present invention is to make illicit entry through a " doorway closed by a wooden door considerably more difficult. According to the invention this is achieved by providing the inside of the door with a parallel-epipedic body, consisting of one or more parts and being made of a hard material such as metal. The parallel-epipedic body closely fits the jambs and lintel of the surrounding doorframe. The parallel-epipedic body contains one or more spring bolts cooperating with one of the jambs of the doorframe. Said spring bolts are displaced by members activated by the handle and possibly also latch knob of the original door. The parallel-epipedic body is provided with dowels on the side opposite the one containing the spring bolts. Said dowels are intended to co¬ operate with the other jamb of the doorframe. Additional features of the invention are revealed in the following claims. The present invention will be described in more detail with reference to the accompanying drawing showing a door hung in a doorframe. The figure shows a conventional wooden door 1 hung in a frame 8-10. A threshold 7 cooperates with the doorframe. The original door is pro¬ vided with a handle 29 and a latch knob 30. A parallel-epipedic body 2 has been secured on the inside of the door. This is manufactured from cold-rolled sheet metal having a thickness in the order of 1.25 mm.. The body is constructed from a sheet of metal shaped with an upper surface, two side surfaces and two flange surfaces terminating each side surface, said flange surfaces being parallel to the upper part. The upper and lower side surfaces of the parallel-epipedic body are completely open. However, they may of course be closed by bending the sheet metal. The inner surface of the parallel-epipedic body may be made larger than said flange surfaces so as to correspond exactly to the upper side of the parallel-epipedic body or to such an extent that the region around the handle and latch knob is covered by metal. When the door 2 is closed, the side surfaces of the parallel-epipedic body fit closely to the jambs and lintel 11, 16 and 14 of the doorframe 8-10 and to the threshold 7 or floor surface replacing the threshold. The parallel-epipedic body 2 is secured to the door 1 by suitable means such as screws. The cavity in the parallel-epipedic hody is suitably filled with a material which is fire- , proof and possibly also sound-proof. The shafts of the handle 29 and latch knob 30 are extended to allow them to be operated from the inside of the parallel-epipedic body 2. The parallel-epipedic body contains two spring bolts 17 and 18 cooperating with recesses 19 and 20 in the jamb 16 of the vertical frame part 8. Each hole or recess is surrounded by a striking plate 21, 22, respectively. The two spring bolts 17 and 18 are actuated by the handle 29 and latch knob 30 via movement-transmitting members 31-34. The side of the parallel-epipedic body opposite the side with the spring bolts is provided with two dowels 23 and 24, each co¬ operating with recesses, not shown, in the jamb 11 of the doorframe 8. Each of the recesses is surrounded by a striking plate, not shown. Since the spring bolts and dowels of the parallel-epipedic body 2 co¬ operate with the jambs of the doorframe, it is more difficult to break up a door provided with a parallel-epipedic body in accordance with the present invention. The body also impedes undesired operation of the spring bolts. The present invention enables conventional front doors to be made more difficult to break into without the door having to be replaced by a door made entirely of metal. The parallel-epipedic body may be made of several vertical units to faci¬ litate repairs on the lock. In this case, the part located furthest from the hinge shall contain said spring bolts 17 and 18 and said movement- transmitting members 31-34. The movement-transmitting members may consist of link systems or of wire systems or of a combination of both. The movement-transmitting members may be arranged together with the spring bolts as a unit in a door, the bolts cooperating with the thickest part of a vertical frame part, i.e. one of the jambs. The door can then be made either as single unit or as a door provided with a parallel-epipedic protective body. Λ_-

Claims: CLAIMS 1. A device for conventional doors of wood or similar material, said door to be hung by means of hinges arranged on the door itself, in a doorframe in a doorway with or without threshold, said doorframe having both jamb and frame flange, c h a r a c t e r i s e d in that a parallel-epipedic, preferably hollow body (2) of a hard material such as metal is secured to the rear of the door (1), the circumferential surface (3-6) of the body (2) when the door (1) is hung and closed, closely fitting the threshold (7) or a floor, and the jambs and lintel (11, 14 and 16) of the doorframe (8-10), in that one or more spring bolts (17 and 18) are arranged in said body (2) and designed to cooperate with recesses (19 and 20) in one of the jambs (16), each recess (19 and 20) preferably being surrounded by a striking plate (21, 22, respectively), in that preferably one or more dowels (23 and 24) are provided in said body (2) " to cooperate with recesses in the other jamb (11), each recess preferably being sur¬ rounded by a striking plate, and in that a handle (29) and/or latch knob (30) in the door (1) is/are arranged so that these (29 and 30) can be operated from the inside of the body (2) and so that they are connected to members transmitting the movement of the latch knob (30) * and the handle (29) to said spring bolts (17 and 18). 2. A device according to claim 1, c h a r a c t e r i s e d in that the body (2) is composed of a number of part units. 3» A device according to claim 2, c h a r a c t e r i s e d in that said spring bolts (17 and 18) and said members (31 - 34) transmitting said movements are arranged in a part unit opposite said jamb (16). 4. A modification according to one or more of the preceding claims, c h a r a c t e r i s e d in that the door (1) and the parallel- epipedic body are manufactured from the said material, preferably metal, as a single unit.

Inventors: GRANLUND BERTIL, GRANLUND, BERTIL
Applicants: GRANLUND BERTIL, GRANLUND, BERTIL
Application year: 1986
Main classification: E05B63
IPC codes: E05B53