INSERTION FRAME

Abstract: A mounting frame (100) to be fixed in a front opening of an electrical service-provider (4) of the type having a front comprising mutually facing flanges on at least two opposite sides of the opening which frame is intended for mounting a desired functional unit on or in the service-provider. The frame (100) is designed so that it could be fixed in said front opening in at least two positions which differ from each other by 90 DEG in rotational direction in the plane of the frame.

Description: INSERTION FRAME TECHNICAL FIELD The present invention relates to an insertion frame for mounting in the front opening of a trunking section, or the like, of the type having a front which on both sides of the front opening comprises mutually facing flanges or parts of the trunking section. PRIOR ART Horizontal trunking systems are used to an increasing extent at installations of electrical- and telecommuni¬ cation cables as well as data communication cables in offices, laboratories and workshops. The trunking sec¬ tions could be provided with compartments in order to separate power cables, telecommunication- and data ca- bles from each other. The trunking sections are not only used for cables. Together with the cables different types of sockets, control means and similar are mounted in the trunking sections designed as insertions for con¬ duit boxes which conduit boxes preferably are arranged in such a way that their openings are flush with the front of the trunking section. Usually the conduit boxes are fixed to the bottom of the trunking section which as the depth and bottom design of the trunking section vary has led to the design of a number of different fastening means and types of conduit boxes. In addition to trunking sections of the horizontal type, mounted as window boards, vertical trunking sections fixed to the walls or free standing, so called poles, and in certain applications floor outlet boxes, i.e. socket units integrated in the floor covered by a pro¬ tecting cover, are also used today. All these different trunking sections, outlet boxes, etc. could be consid¬ ered as electrical ''service-providers'' as they provide and distribute an "electrical service" to the user. The ''service'' could for instance be a certain electrical socket, a switch or the like. Electrical outlet boxes for mounting on the flanges of the opening of a trunking section in stead of to its bottom, otherwise having the same functions, are previ- ously known. The European patent EP-B-0473589 discloses such a box for snap-in mounting and screw fastening in the opening of a trunking section. This box also has a body comprising two parts, the first or lower one com¬ prises the bottom of the box and the portion of the side walls which are intended to be placed inside the trunk¬ ing section. In this portion of the walls hole notches or fracturable parts for the insertion of electrical ca¬ bles in the outlet box are arranged. The lower part which contributes to the locking of the outlet box in the longitudinal direction of the trunking section is fixed against the upper part by means of screws. Common to these prior solutions to the problem of ar¬ ranging outlets, etc. on a service-provider is that an interface has been created on the front of the service- provider which has made it possible to arrange standard¬ ised outlets, control means, etc. usually having the same design as for wall mounting. The disadvantages of the prior solutions are among other things that they require unnecessary large space inside the service-provider and that they according to the fol¬ lowing require an unnecessary large number of parts to implement the desired function or service. DISCLOSURE OF THE INVENTION One object of the present invention is to provide an in- sertion- or mounting-frame for fastening in the front opening of a trunking section on which frame a desired function like e.g. an outlet, a control means or the like could be built which frame allows a reduction of the number of necessary parts to implement the respec- tive function, allows the frame to be used with service- providers having either horizontal or vertical front openings, gives more flexibility when used in floor mounted outlet boxes and allows optimal bending radius for connected cables, especially when mounting the same in vertical trunking sections. This and additional objects are achieved according to the invention by means of an insertion frame comprising the characteristics according to the following patent claims. BRIEF DESCRIPTION OF THE DRAWINGS Further objects and advantages will be apparent from the following description of an embodiment of the invention. The description will be referring to the drawing on which figure 1 shows in a perspective view an insertion frame according to the invention arranged for snap-in mounting in the front opening of a service-provider, e.g. a trunking section, figure 2 shows in section an example of a trunking sec¬ tion, figure 3 and 4 shows in section two further examples of a trunking section on which the insertion frame accord¬ ing to the invention could be applied, figure 5 shows in a perspective view an insertion frame according to the invention together with a few addi- tional devices for implementing an outlet from the trunking section, figure 6 shows in a perspective view the arrangement of a connector holder plate in a position having a certain angle in relation to the frame together with a cover for this arrangement, figure 7 shows in a perspective view the arrangement of a connector holder plate in the plane of the frame to- gether with a cover for this arrangement. PREFERRED EMBODIMENT An embodiment will be described in the following accord¬ ing to which the insertion frame is mounted on a trunk¬ ing section. As mentioned above it is however a charac¬ teristic feature of the insertion frame that it could be used with other service-providers as well, e.g. in floor mounted outlet boxes. Thus, the following description refers to a non-limiting example. In figure 1 is shown an insertion frame 100 according to the invention arranged for snap-in mounting in the front opening of a trunking section of the type illustrated in the figures 2 to 4. In order to make it possible to mount the frame, keeping the vertical direction in ver¬ tical as well as horizontal trunking sections having the same standard width in the opening, it has been given a square form and is in the shown example symmetric around a central vertical plane. Both pairs of parallel sides are provided with snap-in arrangements comprising a guiding and spacing means 1 and a co-operating hook 2 at each endportion of a side. Thus, in the shown example the frame is provided with four guiding and spacing means 1 and eight hooks 2. The guiding and spacing means contribute to the guiding of the frame in the front of the trunking section and also give the correct position for the front of the mounted frame flush with the front of the trunking section. The guiding and spacing means do, however, not have to extend along the entire length of the side and one hook per side could be enough in certain applications. The hooks are arranged to grip un¬ der the flange 3 when the frame is mounted in the trunk- ing section 4. At the same time the guiding and spacing means reaches down into the groove 5 in the trunking section what gives a stable fixing with high friction for longitudinal sliding in the section. Thus, in each of the two alternatives for the assembly only one pair of guiding and spacing means and two pairs of hooks are engaging. Therefore, it could be advantageous if at least portions of the guiding and spacing means are ar¬ ranged fracturable as will be described below. The frame is designed in such a way that it is possible to assembly directly on the same a number of different functions. To this end it is provided with a first sup¬ port for a snap-in connector holder plate 7 in the form of a seat 6 and a pair of locking hooks 8, cf. figure 5, and a second support for a connector holder plate in the form of a pair of grooves 9. The two ways of mounting the plates 7 could be used alternatively or in combina¬ tion as will be shown below. Additionally the frame is provided with support means 12 for a cover 10, 11, cf. figure 5, in the form of four suitably designed grooves at the edge of the frame which co-operate with complementary support means (not shown) arranged on the cover. As an alternative or complement the cover could be fastened with two screws in holes 13 arranged at the edge of the frame. Further, each of the edges of the frame is provided with one or several fracturable spacing means 14 which give correct spacing in the opening of the section to a pos¬ sibly adjacent frame or other insertion unit in the opening. These spacing means could be so designed that when the frame is pressed into the opening of the sec¬ tion these means are automatically broken or bent aside on those sides of the frame where they are not used, i.e. on those sides which will bear against the flange of the opening of the section. The outlet according to the invention could be marked by means of a label arranged directly on the frame. Nor¬ mally the cover 10, 11 is marked which could be a disad¬ vantage at maintenance or mounting of several adjacent outlets. Since several covers at the same time are re¬ moved the covers could possibly inadvertantly be mixed up when remounted and consequently thereafter incor¬ rectly indicate the outlets. If instead the frame mounted in the front of the section is marked the risk of confusion is avoided. The cover 10, 11 is for this purpose provided with a suitable opening or transparent window 15 opposite the attached label. A label holder could e.g., as shown in figure 5, comprise an elevation 16 in the form of a plate and a transparent snap-mounted window 17 which is mounted on top of the label fixed on the elevation 16. The trunking sections could be made of extruded plastic, figure 2, sheet metal, figure 3 or extruded aluminium, figure 4 depending on the application. When the inser¬ tion frame is used in a floor mounted outlet box the parts of the box co-operating with the frame have of course a design similar to what is shown in figures 2 to 4. One of the disadvantages of prior arrangements of out- lets, etc. in trunking sections is, as mentioned above, that they presuppose an outlet box mounted in the trunk¬ ing section, in and on which the desired function is in¬ stalled. The outlet box is mostly fixed to the bottom or the rear wall of the section but could also be mounted in the opening of the section, as shown in the European patent EP-B-0473589. In both cases the space for cabling in the section is unnecessary limited. Especially when additional cables, possibly provided with pre-mounted connectors, have to be installed in a section which has already been cabled the outlet boxes already mounted will cause a problem. On one hand the box body inserted in the section could electrically and mechanically pro¬ tect a sensitive unit during e.g. installation work in the section but on the other hand this protection is not always needed. In order to achieve greater flexibility the frame ac¬ cording to the invention could, if so desired, be pro¬ vided with a snap-on mounted lower protection cover 18, shown in figure 5. To this end the frame and the lower protection cover are provided with complementary snap-on locking means 19, 20, as shown in figures 1 and 5. Other locking means are of course possible to imagine. It should be noted that the lower protection cover has no function in connection with e.g. the fixing of the frame in the opening of the section. In a preferred em¬ bodiment the cover is made of non-rigid plastic and is additionally provided with two slots 22 arranged in op- posite side walls. The slots and the material of the cover allows the cover to be strongly deformed without damaging the same. The cover could therefore, if so de¬ sired, be installed in a trunking section below a previ¬ ously mounted frame but normally the cover will of course be fixed on the frame before this is inserted into the section. As shown in figure 5 the slot leads to a notch at the bottom part of the cover provided with fracturable parts 21. When the cover is mounted from be¬ hind against the frame and e.g. a connector holder plate 7 with connector and cable already has been mounted on the frame the flexible material of the cover allows the cable to be entered through the slot in the direction of the notch provided with the fracturable parts. These parts can now be broken away to provide space for the cable or just be bent aside by means of the cable. In both cases the slot will close again when the cover is fixed against the frame and a very good mechanical and electrical protection is achieved without unnecessary openings in the cover. In figure 5 is shown how a function or service, in this case a data or low tension outlet, could be assembled on a frame 100 according to the invention for insertion in a trunking section 4. We can e.g. imagine that a pre- assembled cable has been drawn into the section. Pre- assembled cable means that the cable has been provided at its endportion with a suitable connector. The frame 100 is snapped into the opening of the section in the position of the outlet. Then the endportion of the cable is inserted from behind through the opening in the frame to the front side where the connector is fixed to a con¬ nector holder plate 7 the size and design of which is adapted for co-operation with the frame 100. The connec¬ tor holder plate exist in a number of different designs when it comes to the hole for the connector. In figure 5 the plate is shown without such a hole for clarity rea¬ sons. Then the connector holder plate is fixed with the con- nector and associated cable on the frame in one of two possible positions. In a flat mounting, as shown in fig¬ ure 7, in which the plate is pressed down in the frame towards the seat 6 where it is fixed by a snap-in func¬ tion by means of the locking hooks 8, or in an inclined position, as shown in figure 6, in which protruding por¬ tions 23 on the plate are inserted in the grooves 9 on the frame. A suitable marking is applied to the frame, as described above, in the form of a label being maintained in posi¬ tion and protected by means of a window 17. Depending on the type of mounting, flat or inclined, which has been used the corresponding cover is then snapped on to the frame. According to known methods for implementing the corre¬ sponding function a special bottom plate is always used on which the function is assembled and which bottom plate is then fixed to a box pre-mounted in the section. The assembly which is made possible by the frame accord¬ ing to the invention does not need any bottom plate ac¬ cording to what has been described above which makes the assembly easier and less expensive. From the previous description it is evident that the frame could be fixed in four different ways in the open¬ ing of a trunking section by stepwise rotation 90° of the frame. An inclined outlet, e.g. according figure 6, can thus be brought into four different directions which gives maximum flexibility. The same frame could thus be used for horizontal as well as vertical sections whereby the desired direction of the outlet could always be achieved. Especially in floor mounted outlet boxes there could be a reason to fully make use of the possibilities given by this flexibility due to the limited space and a concentration of different types of functions. As described above there are two different alternatives for mounting the connector holder plate. Normally, one of those alternatives is used but there might exist situations in which it is desired to use the two posi¬ tions at the same time, i.e. to fix two connector holder plates on the same frame. The arrangement for the two positions on the frame according to the invention has been made in such a way that this is possible. In certain situations it is not desired that a person, operator or other, should be able to reach the connector as such, at least not unintentionally or by imprudence. This could e.g. be true for connectors for data termi¬ nals, laboratory equipment or the like, where disconnec¬ tion of the equipment could have serious consequences. A solution to this problem which is made possible by means of the frame according to the invention is characterised by the fact that the arrangement of the contact against an external cable is carried out at a connector holder plate which is mounted flat. A further plate having a through hole for the cable and possibly tension reliev- ing means is mounted in the inclined position and a cover of the inclined type is snapped on to the frame. The transmission speeds for data communication is fur¬ ther increasing. This means among other things that the smallest authorised bending radius for the transmission cables also increases. According to the previous de¬ scription the frame 100 is provided with guiding and spacing means 1 on all four sides. In each mounting al¬ ternative these means 1 have, however, their guiding and spacing functions only at the two opposite sides which fix the frame against the opening of the section. At the two additional sides these means protrude into the sec¬ tion and take away space unnecessarily and may moreover influence the bending radius in a detrimental way for a high frequency cable in the trunking section connected to the outlet. For this reason at least parts of these inactive guiding and spacing means 1, protruding into the section, could be arranged as fracturable parts.

Claims: CLAIMS 1. Mounting frame (100) to be fixed in a front opening of an electrical service-provider (4) of the type having a front comprising mutually facing flanges on each side of the opening which frame is intended for mounting a desired functional unit on or in the service-provider characterised in that the frame (100) is designed so that it could be fixed in said front opening in at least two positions which differ from each other 90° in rota¬ tional direction in the plane of the frame. 2. Mounting frame according to claim 1, characterised in that the frame (100) has a square form and that each side of the frame is provided with a snap-in arrangement in the form of a guiding and spacing means (1) and at least one hook (2) co-operating with the flanges of the service-provider. 3. Mounting frame according to any of the claims 1 and 2, characterised in that the frame (100) is provided with first fastening means for fixing a connector holder plate (7) on the frame in a position inclined relative to the plane of the frame. 4. Mounting frame according to claim 3, characterised in that the frame (100) is additionally provided with second fastening means for fixing a connector holder plate (7) on the frame in a position substantially aligned with the plane of the frame. 5. Mounting frame according to claim 4, characterised in that said first and second fastening means are so ar¬ ranged that two connector holder plates could be mounted on the frame (100) at the same time. 6. Mounting frame according to any of the claims 1 to 5, characterised in that the frame (100) is provided with fastening means at its rear side for fixing a co- operating separate mechanical and electrical protection cover. 7. Mounting frame according to any of the claims 1 to 6, characterised in that the frame (100) is provided with a holder for a label for indicating the connector arranged on the connector holder plate of the frame. 8. Mounting frame according to any of the claims 1 to 7, characterised in that the frame (100) is provided with means for fixing a co-operating cover. 9. Mounting frame according to claim 8, characterised in that said cover is provided with an opening or a transparent window opposite said holder for said label.

Inventors: BOTVIDSSON LARS, ERIKSSON STAFFAN, BOTVIDSSON, LARS, ERIKSSON, STAFFAN
Applicants: THORSMAN & CO AB, THORSMAN & CO. AB
Application year: 1995
Main classification: H02G3
IPC codes: H02G3