A METHOD OF PROVIDING A MOUNTING FRAME FOR ELECTRICAL COMPONENTS, A COUPLING FRAME FOR PERFORMING THE METHOD, AND A CONCEALED ELECTRICAL INSTALLATION SYSTEM FOR COOPERATION WITH THE COUPLING FRAME

Abstract: According to the invention, the traditional installation boxes intended for recessed mounting in building parts are replaced by two components, viz. a concealed installation system comprising a plurality of boxes (1) which are interconnected by means of pipes or wires (6) and a plurality of coupling frames (4) which are adapted to be inserted through a plate wall (2) and communicate with the concealed box (1). The concealed installation may consist of interconnected boxes and/or a distributed duct system, which is fixed in the cavity of a building part in a first working process. The coupling frames (4) are intended to receive electrical components, such as switches, socket outlets, etc., and these parts are mounted in a second working process only after the plate wall (2) has been completed also with surface finish. This provides two great advantages, viz. partly that the trades on a building site are less dependent on each other, and partly that the concealed installation system is general and can be used in all countries, which may have varying standards with respect to electrical components which are to be mounted. Only an associated coupling frame is required.

Description: 01/31759 A method of providing a mounting frame for electrical components/ a coupling frame for performing the method, and a concealed electrical installation system for cooperation with the coupling frame The invention relates to a method of providing a mounting frame for electrical components with a view to connecting these to a concealed electrical installation system in a building part. DE-A-33 43 651 discloses an electrical installation system which serves to facilitate the mounting of the electrical components in the building. It is well-known that some time is wasted in that the individual trades have to wait for each other on a building site, since it is difficult to coordinate the processes, and this problem has not been solved by the prior art, far from it. The object of the invention is to make the installation work more effective and flexible so that e.g. carpenters, painters and electricians can work more independently of each other, and also so that the ever increasing international trade in building elements is not impeded by national standards for the electrical components. This object is achieved in that the concealed installation system is drilled through a covering for the building part to provide a hole in which a coupling frame is arranged, said coupling frame being fixed mechanically relative to the concealed installation system so that the coupling frame and the concealed installation system together form a cavity to receive current-carrying wires and respective electrical components. What previously constituted the base of a known mounting frame, e.g. in the form of an installation box, is now constituted by the cavity which is provided in the first instance within the building part by means of the con- cealed electrical installation system. Later on when the cavities are drilled, the coupling frame of the invention is mounted, which coupling frame, in one embodiment, predominantly has the shape of a pipe section with a cross- sectional contour that corresponds to the electrical com- ponent which is to be mounted in the building part. The centering of the drilling may be facilitated by using magnets, and once a hole has been made, other holes may advantageously be made by means of a drill jig. The coupling frame comprises coupling means which are adapted to be inserted through the hole and are adapted to be fixed so that the coupling frame is secured. The coupling frame may be adapted to receive a partition wall to separate a power current installation from a weak current installation. The installation as a whole is routed through the concealed installation system, but can in this manner be terminated in respective cavities for associated electrical components. The invention also relates to a coupling frame for perorming the method according to claim 1. The coupling frame is characterized in that it is adapted to be in- serted into a hole which extends through a building covering, which covers the concealed installation system, and into the installation cavity, and that the coupling frame has coupling means which are adapted to fix the coupling frame mechanically relative to said installation cavity. Preferably, the external wall of the coupling frame ad- joins the edge of the hole in the building part, and the internal wall of the coupling frame is shaped to cooperate with securing means on a current-carrying component. As mentioned, the coupling frame may be a pipe section with a predetermined cross-sectional contour so as to provide full access to the installation cavity in the concealed installation system. In some cases it is expedient to arrange a loose bottom in the coupling frame. The invention moreover relates to an electrical installa- tion system for a building, said system comprising a distributed network of possible junctions for electrical components. According to the invention, the junctions comprise a plurality of mutually electrically connected, essentially closed cavities which are concealed behind a building covering. These closed cavities may be formed as a closed box which, arranged behind a building covering, is particularly expedient for cooperation with a coupling frame ac- cording to the invention when the box is drilled via the building covering. The boxes may be interconnected by means of cables or pipes for receiving wires, but the boxes may also be interconnected by means of closed ducts. Hereby, a distributed network of ducts and boxes may be achieved, said ducts and boxes optionally having the same cross-sectional dimensions. It is a very great advantage of the invention that it allows the boxes or ducts to have an extent which is con- siderably greater than what is necessary for a single electrical component. In case of a distributed network of ducts there is thus very great freedom in arranging electrical components when carpenters and painters have fin- ished their work, but also in the event that separate boxes are used in the concealed installation systems, the boxes may have such an extent that - once carpenters and painters have finished their work - there is great freedom in carrying out drilling and mounting of more con- tacts, switches, etc. side by side, vertically or horizontally. The installation system according to the invention also involves great advantages in the export of building ele- ments with a pre-f bricated installation system to countries which may have different standards for the electrical components which are to be placed in the building parts. The dimensions of the electrical components used in various countries may vary greatly, but owing to the extent of the closed installation boxes both large and small mounting frames can be made according to the invention, and it is therefore just necessary to manufacture special coupling frames which fit the electrical components in si2e but also with respect to the coupling means for securing the electrical components in the coupling frames. The securing means of the coupling frame may be adapted to engage an internal wall of the concealed duct or the concealed boxes, and when the external rim of the coupling frame extends completely or partly inwardly over the hole in the building covering, the ducts or the boxes may be clamped to engage the internal side of the building covering. The coupling frame may be inserted into the hole in different ways, so that, during the insertion, the securing means are retracted and are caused to assume their ac- tive, engaging position only when the coupling frame is in position in the hole. The invention will be explained more fully by means of some embodiments with reference to the drawing, in which figs. 1 and 2 schematically show the principle according to the invention, figs. 3 and 4 show an embodiment of a coupling frame for use in connection with the invention, fig. 5 shows another example of a coupling frame, figs. 6 and 7 show a building part in which the mounting frame is to be established, fig. 8 shows a drill jig for use in connection with the mounting, fig, 9 schematically shows an embodiment of an installation system according to the invention, while fig. 10 schematically shows another embodiment of an installation system according to the invention, Fig, 1 shows a concealed installation box 1, a front plate 2 and a rear plate 3 of a building part, such as a plaster wall, as well as a coupling frame 4 or 5. s will be described later in connection with figs. 9 and 10, the invention may be used in connection with a distributed network of concealed installation boxes which are interconnected by means of cables or wires 6, 7, and/or a distributed duct system which contains cables or wires. The unique aspect of the invention is that, in the first instance, the installation just comprises the closed con- cealed installation, e.g. as shown in fig. 2, but where no drilling of the concealed installation boxes has been carried out as yet. The drilling will depend partly on the type of coupling frame to be mounted, which in turn also depends on which types of contacts or switches, etc. are to be arranged later in the coupling frame. This makes it easier to export building elements which also contain the concealed installation to various countries having different standards for electrical equipment, since the drilling necessary to allow mounting of the correct coupling frame corresponding to the relevant installation equipment is carried out after the building parts have been erected. Even if the concealed installation is not to be exported, the method of the invention provides the advantage that the carpenter and the painter can finish their work before the electrician starts the mounting. The trades are thus more independent of each other. The two shown types of coupling frames 4 and 5 will be explained more fully later with reference to figs. 3-5. But it will be appreciated on the basis of figs. 1 and 2 how the concealed installation box 1 is mounted in a partition wall, preferably so that the installation box en- gages the rear side of a plaster board, following which a hole is drilled, as appears from fig. 2, in which the coupling frame 4 or 5 may be arranged. The coupling frame 4 may be intended for a socket outlet, while the coupling frame 5 may be intended for a switch (see fig. 10) . The coupling frame 5 of fig. 2 is also shown in figs. 3 and 4, where fig. 4 moreover shows an electrical component which is arranged in the coupling frame. The coupling frame comprises a substantially cylindrical wall consist- ing of wall parts Ba-8d (the other wall parts are not designated since they basically function in the same manner as 8a-8d) . Film hinges 9, 10 are present between the wall parts 8a, d and 8c,b, respectively, εo that the wall parts 8a and 8b can move toward each other, thereby al- lowing the flanges 11, 12, which are integral with the wall parts 8a and 8b, respectively, to get within the substantially circular contour which the coupling frame 5 has, which in turn corresponds to the contour of the hole which is drilled through the wall 2 and the concealed in- stallation box 1. The coupling frame 5 may hereby be arranged in the hole, and then the walls 8c and 8d are straightened out to the position shown in fig. 4, whereby the projections 11, 12 engage the inner side of the wall of the concealed installation box 1 which faces the plas- ter board 2. An electrical component is indicated at 13, having an engagement area 14, 15 for engagement with the bosses 16, 17 and 18, 19, respectively. This prevents collapse of the wall parts 8a-8d of the coupling frame 5. The described example of a coupling frame can be anufac- tured at very low costs. Another example of a coupling frame is shown in greater detail in fig. 5, where the wall 20 of the coupling frame is formed to receive another type of electrical component than the one shown at 13 in fig. 4. The mounting means for the embodiment shown in fig. 5 are made in a manner known per se by means of three strips 21-23, which each are provided with a toothing 24 and are placed in a groove with an elastic ratchet pawl 25. Each of the strips 21-23 ends in a claw, e.g. 27 or 28, which, in the position shown in fig. 5, is disposed within the contour of the hole drilled in the wall (see fig. 1) so that the coupling frame can be mounted in the hole. When the strips are then pulled, the claws will be caused to engage the internal wall of the concealed installation box, whereby the coupling frame is mounted. In comparison with known installation boxes, e.g. a box for recessed mounting, the invention may be regarded as a "two-part" box, there being provided a concealed installation system in the first instance, and only after drilling and mounting of coupling frames will the installation resemble what is known from prior art boxes for recessed mounting. As already mentioned, the advantage of the invention is that the working operations for the various trades are more flexible, and that different types of coupling frames and associated electrical components may be arranged freely to a much higher degree than before. The partition wall 29 shown in fig. 5 is just an accessory which may optionally be mounted in the coupling frame if it is desired e.g. to separate a power current installation from a weak current installation. A description will be given below of some working operations which serve to demonstrate how easy it is to use the installation system according to the invention. Figs. 6 and 7 show how the drilling may be carried out through the plate wall 2 by means of e.g. a spoon bit 30. The concealed installation box 1 may be provided with a strong circular magnet 31, and it may be detected by means of a search magnet 32 in a manner known per se where the first hole may advantageously be drilled in the plate wall 2. When/if more holes are to be drilled in the same installation box 1 (or duct), the drill jig 33 shown in fig. 8 may advantageously be used, said drill jig containing a pair of mutually perpendicular levels 34, 35. When the hole has been centered, as explained in connection with fig. 6, it may be marked, before using the spoon drill 30, where a further hole must be, and the hole, as explained in connection with fig. 6, is caused to be flush with a hole 36 in the drill jig so that the hole 37 defines the next hole which is to be drilled after the levels have been set correctly. Drilling may be continued in this manner to provide a desired number of holes vertically above each other or horizontally side by side, depending on how large installation boxes are used for the concealed installation. As shown in fig. 9, the concealed installation may basically consist of a plurality of concealed installation boxes 38, 39 which are interconnected by means of cables or pipes for wires 40-42. By means of the described magnet centering system it is easy for the electrician to hit the mark in the finished wall plate, The concealed installation system may also comprise a distributed network of closed ducts 43 which are positioned behind a plate wall 44. This embodiment has the advantage that later there is great freedom in drilling additional coupling frames vertically or horizontally side by side. Fig. 10 also shows an electrical component 45, which may be a switch, a socket outlet, a telephone jack, a data terminal, control lamps, etc. According to the invention the installation does 'not have to comprise a specific type or a specific make of coupling frames and associated electrical components. The invention also allows mixing of different types, when only the drilling is carried out in accordance with the dimension or contour of the coupling frame used.

Claims: P a t e n t C l a i m s 1. A method of providing a mounting frame for electrical components with a view to connecting these to a concealed electrical installation system in a building part, c h a r a c t e r i z e d in that the concealed installation system is drilled through a covering for the building part to provide a hole in which a coupling frame is arranged, said coupling frame being fixed mechanically relative to the concealed installation so that the coupling frame and the concealed installation together form a cavity for receiving current-carrying wires and respective electrical components. 2. A method according to claim 1, c h a r a c t e r i z e d in that magnets are used in the concealed installation system for centering the drilling. 3. A method according to claim 2, c h a r a c t e r i z e d in that a drill jig is used for centering additional holes in the vicinity of a first hole. 4. A method according to claim 1, wherein the coupling frame comprises coupling means which extend outside the contour of the coupling frame in their active position, c h a r a c t e r i z e d in that the hole is drilled to correspond to the contour of the coupling frame, and that the coupling means are brought within this contour when the coupling frame is arranged n the hole, 5. A method according to claim 4, c h a r a c t e r - i z e d in that the coupling means are caused to engage behind a wall of the concealed installation system after the coupling frame has been arranged in the hole. 6. A method according to claim 1, c h a r a c t e r i z e d in that several cavities are provided by means of partition walls in the cavity which is defined by the concealed installation system and a plurality of coupling frames. 7. A coupling frame for a current-carrying component for the mounting of it in a building part which contains current-carrying wires in a concealed installation system in the building part, c h a r a c t e r i z e d in that the coupling frame is adapted to be inserted into a hole extending through a building covering which covers the concealed installation system, and that the coupling frame has means which are adapted to connect it mechanically with the concealed installation system so as to form a cavity for receiving current-carrying wires and respective electrical components. 8. A coupling frame according to claim 7, c h a r a c t e r i z e d in that the coupling frame has a wall with a cross-sectional contour which corresponds to the hole in the building part. 9. A coupling frame according to claim 8, c h a r a c t e r i z e d in that the internal surface of the walls is shaped to cooperate mechanically with a current-carrying component . 10. A coupling frame according to claim B, c h a r a c - t e r i z e d in that it comprises a bottom which adjoins the wall of the coupling frame. 11. A coupling frame according to claim 8, c h a r a c - t e r i z e d in that the coupling frame comprises securing means which are adapted to engage an internal wall of the concealed installation system. 12. A coupling frame according to claim 11, c h a r - a c t e r i z e d in that the external rim of the wall extends fully or partly inwardly over the hole in the building covering, and that the securing means are arranged at a distance from this rim which corresponds to the thickness of the building covering so that ducts or boxes associated with the concealed installation system are pulled into engagement with the internal side of the building covering when the securing means are clamped. 13. A coupling frame according to claim 11, c h a r - a c t e r i z e d in that the securing means extend beyond the contour of the wall, and that the wall is de- for able so that the securing means may be brought within the contour of the non-deformed wall when the wall is deformed. 14. A coupling frame according to claim 11, c h a r a c t e r i z e d in that the securing means comprise clamping means which are positioned within the contour of the wall in a first position, and which extend beyond the contour of the wall in a second, clamped position. 15. An electrical installation system for a building, said system comprising a distributed network of possible junctions for electrical components, c h a r a c t e r - i z e d in that the junctions comprise a plurality of coupling frames which extend through a building part and, behind it, are connected with a plurality of mutually electrically connected, essentially closed cavities which are concealed behind a building covering. 16. An installation system according to claim 15, c h a r a c t e r i z e d in that it comprises a plurality of separate, essentially closed boxes. 17. An installation system according to claim 16, c h a r a c t e r i z e d in that the boxes are mutually electrically connected by means of cables or pipes for receiving wires. 18. An installation system according to claim 16 or 17, c h a r a c t e r i z e d in that the boxes are interconnected by means of closed ducts. 19. An installation system according to claim 16 or 18, c h a r a c t e r i z e d in that the boxes have a significantly greater extent than the electrical components which are to be arranged in the installation system, 20. An installation system according to claim 16 or 18, c h a r a c t e r i z e d in that the ducts have a significantly greater extent than the electrical components which are to be arranged in the installation system.

Inventors: HOLMSTROEM JOERN, HOLMSTROEM, JOERN
Applicants: HOLMSTROEM JOERN, LK AS, HOLMSTROEM, JOERN, LK A/S
Application year: 2000
Main classification: H02G3
IPC codes: H02G3