ADVANCED TECHNICAL POST FOR VANDAL-RESISTANT DOOR

Abstract

The invention relates to a vandal-resistant technical post (1) attached to the door frame of a building. The vandal-resistant technical post (3) includes internal technical devices housed within the post's hollow space. On the street side, the post has small openings (holes for a speaker, an intercom microphone, and a keypad). On the lobby side, the post has an access door arranged so that access to the interior is only possible by operating unlocking mechanisms on the access door inside the post. These mechanisms are themselves only accessible with special tools when the building's main entrance door is open.

Description

Advanced technical post for vandal-proof door. The invention relates to a hollow rectangular technical post in which various elements such as an intercom, code, and illuminated display of the occupants' names are securely housed, contributing to the operation of a house or building door, said technical post being characterized in that it includes an inspection door equipped, on one side, with an invisible hinge and, on the other side, with a locking device inaccessible when the door is closed. We know that acts of vandalism have unfortunately become very common. Building entrances are a particular target for vandals, and property owners have been forced to reinforce doors and their security measures. It has been observed that vandals target not only doors and their locking mechanisms, but also related communication, control, and security systems, such as intercoms and keypads. These ancillary devices were previously installed externally in boxes with front panels embedded in building walls or in building door frames. However, these boxes and their front panels were highly vulnerable to simple tools used by vandals, such as levers and heavy-duty screwdrivers for prying off the box fronts, and wire cutters for severing the connecting wires. Manufacturers of vandal-proof doors have therefore come to install these ancillary, or control, devices in large elements, attached to the frame of building doors, the useful exterior side of which was pierced with only the openings necessary for operation such as a small diameter hole for a microphone, small holes for a loudspeaker, and the holes necessary for the keys of a keypad, the boxes of the ancillary, or control, devices being installed from the inside of the large element accessible by an inspection door opening into the building. The vandals then attacked these access doors from inside the building, which they violated, thus gaining access to the ancillary or control devices, which they damaged. The present invention therefore aims to provide a technical post that is very difficult to violate, used to house ancillary devices for doors of houses or buildings. The problem thus posed is solved by means of a large, hollow technical post, integral with the door frame, containing ancillary or control devices for the door, open to the outside only through small holes in its outer face, for example, to allow sound from the outside to pass through to a microphone or loudspeaker housed inside the technical post, or to allow operation of the keys on a keypad housed inside. The technical post can be opened inwards by means of an access door mounted on one side with concealed hinges, inaccessible when the access door is closed, and a locking device, inaccessible when both the access door and the building door are closed. In a first embodiment, the locking device isconsisting of a folded, hook-shaped reinforcement forming an oblique step fixed to the inside of the door and extending over the entire height of the access door, on the opposite side from that of the concealed hinge, and at least one hook, preferably several, each of these hooks being mounted on a device capable of making it perform a translational movement in the direction parallel to the access door of the post, sufficient to, in one direction, come against the folded reinforcement and, in the other direction, move sufficiently away from the folded reinforcement to allow the door to be opened without the folded reinforcement interfering with the hook placed in the retracted position, said device being controlled by a screw located on the edge of the technical post, situated on the side of the building door, the control screw preferably being a female hexagonal head screw,and a hollow frame being screwed against this edge by means of screws whose heads are located on the inner side of the short side of the hollow rectangular technical post located on the side of said frame, the hollow frame having on the side facing the edge of the technical post recesses suitable for allowing the passage of the heads of female hexagonal screws, and said frame having on the rebate side a hole suitable for allowing the passage of a tool enabling the tightening of the control screw. In another embodiment, the technical post is positioned on the side facing the building's door, so as to form the frame of the door, and in particular, the rebate into which the building's door fits when closed. In this embodiment, the edge of the technical post opposite the edge of the door when it is closed has a suitably shaped hole to serve as a strike plate for the bolt of a lock installed in the door, for example, an electric lock.The technical post inspection door is, as in the previous embodiment, mounted with invisible hinges on the side opposite to that of the frame rebate, said invisible hinge being inaccessible when the inspection door is closed, because it is covered by a right-angled return forming a lip of the inspection door on the hinge side, said lip coming practically against a wing of an angle screwed from the inside, or welded by its other wing to a return of the profile parallel to the inspection door when the latter is in the closed position, said return carrying one of the invisible hinge elements and the door being equipped with the other element of the invisible hinge. On the opposite side of the sheet metal access door, a symmetrical return on the hinge side, invisible relative to the longitudinal axis of symmetry of the access door, is welded to the inside. This return features a metal strip with tapped holes, which, as will be seen later, will receive screws for temporarily locking the access door. The edge of the technical post containing the lock bolt passage has a metal bar of approximately rectangular cross-section, fixed either by welding or by means of screws whose heads are inside the technical post, against the aforementioned edge of the technical post. The metal bar has holes aligned with corresponding holes in the aforementioned edge, which are themselves aligned, when the access door is closed, with the tapped holes in the metal strip attached to the access door.The holes made in the metal bar are widened at the opening on the outside to accommodate screw heads, for example, female hexagonal head screws so that the screws, screwed into the tapped holes in the metal strip, do not protrude from the outside face of the metal bar. It is understood that these screws temporarily prevent the access door from opening, as it can only be opened by unscrewing them. To make the screw heads inaccessible and thus prevent them from being unscrewed, a U-shaped profile serving as a cover is installed to enclose the metal bar on three sides. The two arms of the U come against the edge of the technical post and the return of the access door, respectively. This U-shaped profile serves, firstly, to support the building door in the closed position by completing the rebate, and secondly, because it is screwed onto the metal bar with screws whose heads are flush with its outer surface on the side facing the building door, it is impossible to remove it when the door is closed. Furthermore, the screws securing this U-shaped profile are preferably tamper-proof screws that can only be unscrewed with a special tool.It should be noted that the technical post thus made does not offer any points of attack for the preferred tools of vandals, such as levers or strong screwdrivers. Examples of implementation, which are not exhaustive and are particularly effective, are described below in relation to the drawings. Figure 1 represents a modular door and window frame assembly comprising a technical post according to the invention, seen in elevation of face. Figure 2 is a cross-section of the entire door frame assembly. according to figure 1. Figure 3 is a cross-section of a technical pole according to the invention. according to line II of figure 1, and the door frame related series. Figure 4 is a cross-section of another post embodiment. technique according to the invention, the technical post making itself acting as a sleeper, in addition to its other functions tions. Figure 1 shows door 1, frame 2, and technical post 3. Other, unreferenced elements complete the representation, but their only function is to complete the hall's closure. In the embodiment shown in Figure 1, the invention relates to the technical post 3 and its interaction with the frame 2. Door 1 is shown to locate the technical post within the door frame assembly. In the embodiment shown, the door is equipped for locking by soft iron plates that cooperate with magnetic catches embedded in the frame 2, but other locking devices are, of course, possible. Figure 2 is a cross-section of the assembly shown in Figure 1, along line II of Figure 1. Figure 3 is a cross-section of the technical post 3, the frame 2 and the end of the door 1 in the closed position, its soft iron plate 39 being attracted by the magnetic suction cup V housed in the frame 2. The frame 2 is made fixed to the technical post 3 by means of screws which are screwed from the inside of the technical post 3, passing through the sheet forming the edge of the post on which the frame is applied and which are engaged in tapped holes made in the frame 2. An access door 31 allows the technical post 3 to be closed at the rear, on the side of the building's lobby, or conversely to access the inside of the post, depending on whether the access door 31 is closed or open. On the street side, the technical pole 3 has holes, or openings, for ancillary devices such as illuminated displays, intercoms, code devices, etc. These devices are symbolized in Figure 3 under reference 32. The access door 31 has, on one side (the left side in the figure), one or more concealed hinges, one of which is shown in cross-section. The concealed hinge 33 comprises two elements: an element 331 integral with the access door 31, to which it is welded on the inner side of the access door 31's sheet metal; the access door 31 having, on this side, a return 34, perpendicular to the general plane of the access door 31, extending along its entire height and rendering the hinge(s) inaccessible and invisible. When the access door is closed, this return is in the immediate vicinity of a return 35 of the technical post, parallel to the general plane of the technical post and to the general plane of the access door 31. This return 35 receives the second element 332 of the concealed hinge, which has a Z-shape in the cross-section of Figure 2.One of the outer arms of the Z is screwed against the return 35 of the technical post, and the other outer arm of the Z has a fixed axis 351. This fixed axis is surrounded by a rolled portion of the first element, which can thus rotate around this fixed axis. It is understood that when the door is open, the return 34 of the door fits into the open angle 3321 of the Z of the second concealed hinge element 332. Sabotaging the invisible hinge is very difficult because the return 34, on the one hand, extends over the entire height of the door, and on the other hand, leaves practically no space for the insertion of a lever between it and the return 35 of the technical post 3. On the other side, the access door 31 has, on its vertical inner edge, at a certain distance from the right lateral end (in the drawing) of the door, a folded reinforcement 37, welded to the inner side of the door, extending vertically, leaving between it and the lateral end of the access door 31 a strip of sheet metal 311 of the door which, when the door is in the closed position, abuts against a return 36 of the technical post 3, approximately perpendicular to the edge of the technical post 3 and approximately parallel to the general plane of the technical post. The folded portion 371 of the folded reinforcement 37 forms an acute angle with the portion of the same folded reinforcement 37 welded to the inner face of the sheet metal of the access door 31. This folded portion 371 of the reinforcement 37 serves to lock the door 31.Hooks 38 have a wing 381 capable of bearing against the folded part 371 of the folded reinforcement 37 of the door and another wing 382 engaged in a translation device 39, so as to be approximately parallel to the edge of the technical post 3 attached to the frame 2. The two wings 381 and 382 of the hook 38 are connected by a connecting part 383. The translation device 39 includes a screw 391, preferably a female hexagonal head screw, a threaded insert 392 crimped onto the hook 38 and a conical helical spring 393. The arrangement of these elements is as follows The head of the screw 391 is located inside the closed frame 2. We will explain later how this screw can be screwed in or unscrewed. The threaded part of the screw 391 passes through a hole made in the edge 394 of the frame, then through a hole 395 made in the edge of the threaded post secured to the corresponding edge of the frame, then it passes through a conical helical spring 393 threaded onto it, the conical spring bearing against the edge of the hole, then it enters the internal thread of the tapped insert 392, crimped onto the hook 38. The translation device described above operates as follows: when the screw 391 is tightened using a suitable screwdriver through a hole 396 made opposite it in the rebate of the frame, the insert moves closer to the inner wall of the technical post, compressing the conical spring. At the end of its travel, the conical spring is almost fully compressed and the wing 381 of the hook 38 is pressed against the folded reinforcement. It is recalled that several identical locking devices can be installed along the height of the technical post. It will therefore be understood that the access door 31 is perfectly held in the locked position. Inserting a lever between the vertical strip 311 and the return 36 of the technical post is very difficult, and even assuming that a vandal manages to deform the strip 311 along its entire height, this does not solve the problem of opening the door, which remains impossible because it is held in place along its entire height by the folded reinforcement 37 and by the hook(s) 38. To make unscrewing the 391 screws even more difficult for vandals, in addition to the fact that, as described so far, the building door must be opened to access the screw heads with a screwdriver, two additional measures can be used, separately or in combination. The first step involves positioning the access holes for the 38 screws in the frame's rebate, offset in height and / or width from the screw heads. With a standard screwdriver, it's impossible to unscrew the 38 screws, even if you know there are screws positioned slightly higher or lower. A special ball-end screwdriver is required to remove these offset screws; these screwdrivers can operate at angles of up to approximately 15 degrees relative to the screw's geometric axis. These screwdrivers are not widely used outside of professional settings. The other complementary measure consists of fitting the holes drilled in the frame's rebate with so-called tamper-proof screws, which can only be unscrewed with another special tool, also uncommon outside of professional circles. Even assuming these screws are removed according to the second complementary measure, it takes time, and if there is a vertical offset, as proposed by the first complementary measure, vandals may not be aware that a screw head is located in the opposite wall, with a vertical and / or horizontal offset. If this screw head can only be unscrewed with a special tool, it complicates the vandals' task. It should be added that the technical skills of vandals are currently limited to using levers rather than opening access doors using the more sophisticated techniques employed by a mechanic or locksmith. Figure 4 represents another embodiment of an anti-vandalism post according to the invention. In this embodiment, the access door 31 is mounted on concealed hinges on the side of the technical post located opposite the building entrance. This assembly, identical to that shown in Figure 3, will not be described again. On the side of the technical post located opposite the building entrance, the post itself serves as the frame. It includes a lock, for example, an electric lock, whose bolt engages in a strike plate in the edge of the door. On the interior side of the building, a rectangular metal bar 371 is screwed to the edge of the technical post by means of screws whose heads are located on the interior side of the technical post. A thick metal strip 389 (or sections of metal strip) is welded to a return of the access door 31. This metal strip has several holes 3891.When the door is closed, these tapped holes correspond to smooth holes drilled in the metal bar 371, aligned with the tapped holes 3891. These tapped holes have a larger diameter at their outward opening to accommodate screw heads. Screws 360 are screwed into these tapped holes and penetrate the smooth holes in the strip welded to the return 380 of the door 31. To make the screws 360 invisible and inaccessible, a U-shaped profile 3910 is used, forming a robust cover along the entire height of the technical post, surrounding the metal bar 371 on its three outer sides. This U-shaped profile is screwed in using 391 screws, known as tamper-proof screws, whose heads are countersunk into the thickness of the profile flange. U, the building door coming into contact with this U-shaped profile when it is in the closed position, concealing the screws 391 Access to these screws is impossible when the building door is closed. This embodiment also achieves the objectives of the invention.

Claims

Demands 1. Hollow technical post for vandal-resistant building entrance, containing inside various ancillary communication, control, or security systems, preferably equipped on the inside of the frame with a vandal-resistant access door, said access door allowing various maintenance, repair, and code change operations for the ancillary systems housed in said technical post, characterized in that The inspection door has on one side invisible hinges to which access is prohibited by a return (34) of the sheet metal of the inspection door which forms an approximately right angle with respect to the general plane of the inspection door, and which, when the inspection door is closed, comes into the immediate vicinity of another return (35) of the sheet metal of the edge of the technical post, this return being approximately parallel to the general plane of the inspection door and approximately perpendicular to the edge of the post, said return (35) serving to fix an element (332) of the invisible hinge (33), in that the access door has, on the opposite side from where the concealed hinges are located, a folded reinforcement (37), welded to the inner side of the door, extending vertically, leaving between it and the lateral end of the access door (31) a strip of sheet metal (311) of the access door (31) which, when the door is in the closed position, comes against a return (36) of the technical post (3), approximately perpendicular to the general plane of the technical post (3), the folded portion (371) of the folded reinforcement (37) forming an acute angle with the portion of the same reinforcement (37) welded to the inner face of the sheet metal of the access door (31), this folded portion (371) serving to lock the door by means of wings (381) of hooks (38) capable of bearing against the folded portion (371) of the folded reinforcement (37), other wings (382) of the hooks (38) being engaged in translation schemes (39),mounted on the corresponding edge of the technical post (3) and allowing the hooks (38) to move by translation, the wings (381) coming, in one direction, to bear against the folded part (371) of the folded reinforcement (37) and, in the other direction, the wings (381) of the hooks (38) being brought sufficiently away from the folded part (371) so as not to interfere with it during the opening movement of the door by rotation on the invisible hinges.

2. Technical pole according to claim 1, characterized in that The translation devices (39) embedded in the edge of the technical post (3) comprise: - a screw (391), preferably with a female hexagonal head, - a threaded insert (392) crimped onto a hook (38), - and a conical helical spring, the arrangement of these elements being the following the head of the screw (391) is located inside the closed frame (2), the threaded part of the screw (391) passes through a hole made in the edge (344) of the frame, then through a hole (395) made in the edge of the technical post (1) secured with the corresponding edge (344) of the frame, then it passes through a conical helical spring (392) threaded onto it, the conical spring (392) being supported on the edge of the hole (395), then it enters the internal thread of the tapped insert (392) crimped onto the hook (38), these elements cooperate with each other in the following way: when the screw (391) is screwed in, by means of a suitable screwdriver passing through a hole (396) made in the rebate part of the frame, the threaded insert approaches the inner wall of the technical post (1), the conical helical spring compresses and the wing (381) of the hook (38) comes to apply itself against the folded part (371) of the folded reinforcement (37) of the inspection door (31).

3. Technical pole according to claim 2, characterized in that the holes (396), each corresponding to a screw (391) of the translation device, are made with a deviation from the geometric axis of the corresponding screw (391), said deviation being able to reach approximately 15 degrees of angle.

4. Technical pole according to claim 3, or claim 4, characterized in that the holes (396) are closed by screws, said to be unscrewable.

5. Hollow technical post for vandal-resistant building entrance, containing various ancillary communication, control, or security systems, preferably equipped on the inside of the frame with a vandal-resistant access door, said access door allowing various maintenance, repair, and code change operations for the ancillary systems housed in said technical post, characterized in that The technical post itself constitutes the vertical upright of the door frame, on the opening side of the door, in that it is fitted with an access door which has concealed hinges on one side and is arranged on the other side as follows - a thick metal strip (389), (or sections) (389', 389", 389'", etc.) is (are) welded onto a return of the door of visit (31), smooth holes (3891) being made in the strip Thick metallic (389), or in sections of metallic strip thick (389', 389", 389'"), - a metal bar (371) of rectangular cross-section is screwed con to the edge of the technical post (1) by means of the screws, of which the heads are located on the inside side of the technical pole and It features threaded holes, having a larger diameter at open to the outside, so as to be able to house heads of screws, screws that can be screwed into or unscrewed from these holes tapped, drilled, smooth and able to fit into smooth holes its (3891) thick metal strip, (or sections of thick metal strip (389), - a U-profile forming a robust cover over the entire height of the technical post (1), surrounding the bar on three outer sides metallic (371), is screwed in by means of screws (391), called unscrewable sands, whose heads are embedded in the thickness of the wing of the U-shaped profile (3910), the building door applying to this U-shaped profile, when in the closed position, in mass as for the screws (391).