ELECTRIC TERMINAL BOX

Abstract: Electric terminal box, including connecting pins (6, 6', 6'') extending from the bottom surface of the terminal box housing (1) in direction towards the open portion of said housing (1), arranged to facilitate connection of electric wires inserted into the terminal box, also arranged to establish electrical connection with tubular connecting means (14), located in a corresponding configuration at the electrical switch, power point or similar component intended to be arranged in a position mainly surrounded by the housing (1), said component, when inserted into the terminal box establishing electrical contact via the connecting pins (6, 6', 6'') to the electrical wires inserted into the terminal box. The connecting pins (6, 6', 6'') are preferably attached to a base plate (5), rotatably mounted adjacently to the internal bottom surface of the housing (1), and arranged lockable in desired angular rotary positions in relation to the housing (1) by means of a locking member (10, 11), co-acting with the housing (1). The component to be attached, and electrically connected, is preferably arranged with a locking means (15, 16), coacting with the housing (1) or a separate co-acting member (9), in order to facilitate securing of the component in desired relative position to the internal bottom surface of the housing (1), said members (9, 15, 16) preferably being arranged only to facilitate unlocking by use of a special purpose tool.

Description: Electric terminal box The present invention relates to an electric terminal box, intended to faciliate an improved method of connection, both with regard to electrical wires extending to the terminal box as well as electrical switch or contact means, wall mounted power points or sockets, and other similar components attached to the terminal box. Existing types of electric terminal boxes are attached in a wall unit of a building in a previously known fashion by means of nails or other suitable means, or moulded into the wall, and they are joined to each other, or to an electric distribution panel, by means of pipes, into which electrical wires are insertable. When erecting a building, said installation is carried out a first step, whereafter an electrician usually performs the wiring operation to the electric terminal boxes as a second step. After this operation, it is desirable to perform necessary decorating operations such as papering and painting, and connection and attachment of the components such as electrical switching or contact means, wall mounted power points or sockets or similar components to the terminal boxes is performed as a third and separate step. The components are attached according to an electrical circuit diagram, and the length of each wire terminated in a terminal box is trimmed by the electrician, wherafter same are connected to a screw terminal forming" a part of each component. The component, thus electrically connected, is thereafter attached to the terminal box by influencing two screws at the component, which cause to pivoting abutment members to take up contact with the internal cylindrical wall surface of the terminal box. As a final step, a covering and protecting lid is attached, having holes or recesses for a manually operable switch means, or intended to faciliate insertion of a power plug. Said lid can either be attached by means of screws, or by means spring members extending from the lid, which faciliate frictional grip against the component attached to the terminal box. The above described method of attachment, and associated components, can serve as an example of the type of components, and the attachment method, presently generally used. However, it is obvious, that this method, and associated components, cause a time-consuming attachment operation and a difficult wiring operation, particularly since wiring is followed by identification and connection of the wires, and these operations are performed as two steps, separated in time. Both these operations are of such a nature, that qualified electricians must be used, in order to obtain full security for correct wiring and connection to associated components, such as switches, power points or sockets, or similar. When both of these operations are performed, it is necessary to accurately follow an electrical.circuit diagram, to ensure correct electrical connection.A further disadvantage related to previously known method of attachment, and associated components, is that switches, power points or sockets, or similar components, often later are exchanged by unauthorised persons, which by means of a screw driver can perform the necessary removal and attachment operations, including electrical connection of the exchanged component. This is extremely non-desirable, since incorrect connection, e.g. of an earth protected power point or socket, have caused a number of serious accidents, often fatal. The object of the present invention is to remove all the above disadvantages related to electric circuit boxes and associated components as presently used, and the installation time is also considerably reduced and connection of electrical switches, power points or sockets, and similar components, which as described above is carried out as a final step in the installation operation, can now be carried out extremely fast, and also by other persons than qualified electricians. A basic embodiment of an electric terminal box according to the present invention is more fully described below, reference being made to the accompanying drawings. Fig. 1 is an exploded perspective view of an electric terminal box with an associated wall power point or socket of two-way type, arranged according to the present invention. Fig. 2 is a plan view of the terminal box shov/n in fig. 1. Fig. 3 is a cross-sectional view of the terminal box shown in fig. 2 Fig. 4 is an electric terminal box according to figs. 1 and 2, in which the base of a two-way type power point or socket is mounted. Fig. 5 shows the electric terminal box with associated parts as shown in fig. 4, but with two manually operable switching members attached (a double electrical switch). The present invention is based on the use of an electric terminal box, slightly modified in relation to existing types. Said electric terminal box includes a mainly conventional housing 1, arranged with desired number of connections for pipes, through which the electrical wires terminating in the terminal box are insertable. The housing 1 can be arranged in a previously known manner with surrounding grooves, intended to improve attachment when moulded into a concrete wall,, and/or attachment members 2, 2', intended to faciliate attachment of the housing by means of nails or similar. 'In the bottom portion of the housing 1, a centrally located through hole 3 is arranged, a tubular rivet 4 being arranged extending through said hole 3, thereby joining a bottom plate 5 in a rotable relationship in relation to the housing 1. A washer 5 is also shown located in an intermediate position between said bottom plate 5 and the internal bottom surface of the housing 1. From the bottom, plate 5 extends a number of connecting pins 6, 6', 5", having a longitudinally extending through slot, said pins being located in pairs separated from each other.The two centrally located connecting pins 6' are internally electrically connected by means of an inter¬ connecting member 7 located by the base plate 5, said interconnecting member 7 also including a centrally located threaded hole 8, in whi'ch a threaded stud 9 is. attachable. At a peripheral portion of the base plate 5 is a further threaded through hole 10 located, in which a lock screw 11 is attachable. Against each of the connecting pins 6, 5', 6" is a lock washer 12 attachable, said lock washer 12 having a through hole with a diameter slightly smaller than the outside diameter of the connecting pins 6, 6', 6", and attachment of said lock washer 12 against a connecting pin 6, 6', 6" reduces the width of the longitudinally extending through slot. The above described electrical terminal boc is mounted in a wall unit in a previously known fashion, whereafter electrical wiring is performed to the installed terminal boxes in accordance with a relevant-: electrical circuit diagram. However, when said wiring operation is performed, connection is also performed to the connecting pins 6, 6', 6" which is a major difference in relation to previous methods. The bottom plate 5 is located by rotation within the housing 1 to a position in accordance with directions given in the circuit diagram, whereafter the bottom-plate 5 is locked in the predetermined position in relation to, for example, the floor surface. It should be mentioned, that the base plate 5 when mounted in the . housing 1 preferably is locked by means of the lock screw 11 in a certain predermined position, which position is suitable for the most common types of installations. The insulation of the free end portions of the electrical wires is removed in a previously known way, whereafter said end portions are inserted into the through slots of the connecting pins 6, 6', 6". The inserted end portions are thereafter locked in position by pressing a lock washer 12 down over each connecting pin 6, 6', 6" into which an electrical wire has been inserted. Said method of connection results in a considerable saving of time in relation to connections made to screw terminals. With regard to the two centrally located connecting pins 6', electrically connected to each other by means of the connecting member 7, said pins are normally utilized for earth connections, with regard to installations requiring a protective earth connection. When the wiring operation has been performed, and the electrical wires have been connected to the connecting pins 6, 6' , 6" in the terminal boxes in a previously described fashion, each electric terminal box is thus electrically connected in accordance with a previously drawn up electrical circuit diagram, i.e. with the connecting pins 6, 6', 6" located and connected in a predetermined way. When erecting new houses or buildings, necessary decorating operations can now be performed, since it normally is desired to paint or paper the walls before any power points or sockets, switches or similar components, are installed and attached to the electric terminal boxes. When this work has been carried out, components of the above type should be attached and connected to the terminal boxes. Since necessary wiring and connection to the connecting pins 6, 6', 6" has already been performed, the final attachment stage can now be performed extremely simple and in a minimum of time, but the components attached are slightl modified in relation to presently used types of switches, power points or sockets, and similar components, in order to faciliate attachment and connection to the connecting pins 6, 6', 5" surrounded by the housin With reference to Fig. 1, an example of such a modified component is shown, being a two-way wall mounted power point or socket. Said power point or socket includes a mainly conventional electrically insulating body 13, but it includes a number of tubular connecting means 14, extending towards the base plate 5, located in a configuration which corresponds to . the connecting pins 5, 6', 6". When the body 13 is inserted into the housing 1, said tubular connecting means 14 are arranged to embrace the connecting pins 6, 6', 6", and thus establish an electrical connection v/ith same. Tire tubular connecting means 14 are thus arranged having an internal diameter being slightly smaller than the outside diameter of the connecting pins 6, 6', 6", preferably arranged with one or a number of longitudinally extending through slots, intended to improve the e.lectrical contact properties between the tubular connecting means 14 and the connecting pins 6, 6 1 , 6". The stud 9 extending from the base plate 5 in direction towards the body 13 is utilised to accomplish secure attachment of the body 13 to the terminal box, and in order to faciliate location of the body 13 in a position related to the wall surface. Attachment against the stud 9 is performed using a special purpose tool for influencing a part 15, centrally located and protruding from the electrically insulating body 13, which moves;;a locking member, surrounded by the body 13 and co-acting with the external screw thread on the stud 9. When the body 13 has been located in desired position in relation to the adjacent wall surface, a U-shaped member 16 is inserted into the part 15, having interlocking means co-acting with the external screw thread on the stud 9. Hereby is a joint accomplished, which can not be influenced without special purpose tools, i.e. unauthorised persons are unable to remove the protective part 16, and even if this was possible, a further type of special purpose tool would be required to influence the locking member located surrounded by the electrically insulating body 13. A protective outside lid (not shown) is thereafter attached, and the attachment of same can be performed in many previously known ways, e.g. by means of spring members, co-acting with the terminal box or the insulating body 13, and obviously also by means of screws, even though the latter type of attachment increases the installation time. The final installation, performed as described above, results in a considerable saving of time compared with the installation time for components having screw terminals, in which case it also is extremely important that qualified personell is used, in order to secure correct installation of the components. When using components according to the present invention, which only are inserted into the terminal box and locked in desired position to adjacent wall surface, the time for final installation is obviously considerably reduced, and also simplified, since only a list of existing terminal boxes are required, including information for each terminal box regarding the type of component to be attached. The bottom plate 5, as shown, includes preferably two parallel edge portions, whereby rotation of the base plate 5 to desired position in relation to the floor surface is simplified, and said edge portions ' UREΛ?; may also be used co-acting with spring members extending extending fro the protective cover attached covering the component attached to the electric terminal box. Furthermore, a washer 17 is preferably arranged located between the base plate 5 and the internal bottom surface of th housing 1, as shown in Fig. 1. It should also be emphasized, that described and shown embodiment obviously can be modified in a number of ways, while maintaining the important and characteristic features of the present invention. The number of connecting pins 6, 6', 6" can thus be varied, even if the number in thfe described and shown embodiment is sufficient for most applications. Furthermore, the attachment of electrical wires to the connecting pins 6, 6', 6" can also be accomplished in other known ways, e.g. by arranging the connecting pins 6, 6', 6" with through holes, into which the wires are insertable, locked in position by means of screws, along the connecting pins 6, 6', 6" slidable and lockable means or similar. The electrically insulating body 13 can obviously also be attached to the terminal box in other v/ays than described, e.g. by use of other types of locking means co-acting with the stud 9, or by arranging the body 13 with locking means, arranged to take up contact against the internal peripheral wall of the housing 1. Important and characteristic features of the present invention are that the housing 1 is arranged with connecting pins extending from the bottom plane, arranged to faciliate connection of electrical wires terminated in the terminal box, and that , said connecting pins 6, 6', 6" are utlised to accomplish electric connection with the component to be attached to the terminal box, said component including a number of tubular connecting means 14, arranged to establish electric contact with the connecting pins 6, 6', 6" when the component is inserted into the terminal box, thereby accomplishing a predetermined function. The present invention is thus in no way restricted to the shown and described embodiment, which anly is intended to serve as an example of an embodiment within the scope of the inventive thought end the following claims.

Claims: C L A I M S 1. Electric terminal box, characterised in that it includes a base plate (5), rotatably mounted and adjacently located to the internal ' 5 bottom surface of the housing (1) of an electric terminal box, arranged with a locking means (10, 11) co-acting with the housing (1), arranged to faciliate locking of the base plate (5) in desired angular rotated position in relation to the housing (1), further including a number of connecting pins (6, 6', 6"}arranged extending from the base plate (5) 0 in direction towards the open portion of the housing (1), arranged to faciliate connection to electrical wires inserted into the housing (1), and also establishing electrical contact with the component, such as electrical switches, wall mounted power points or sockets, or similar, intended to be attached to the housing (1), the latter component also 5 including a number of tubular connecting means (14), which, when the component is inserted into the housing (1), seize correspondingly located connecting pins (6, 6', 6"), thereby establishing an electrical connection with the electrical wires connected to the connecting pins (6, 6', 6"). 0 2. Device according to claim 1, characterised in that the connecting pins (6, 6', 6") are arranged with a longitudinally extending through slot, arranged to faciliate insertion of an electric wire, said wire being locked in said slot by application of a clamping locking member 5 (12) against the connecting pins (6, 6 1 , 6"). 3. Device according to claim 1 or 2, characterised in that the component to be attached in a position surrounded by the housing (1) includes a locking member (15, 16), arranged to co-act with the housing (1) and/or 0 in the housing arranged co-acting means (9), said locking member (15, 16) being arranged to faciliate attachment of a component inserted into the housing (1) in desired position in relation to the bottom plane of the housing (1 \ , 5 4. Device .according to claim 3, characterised in that the co-acting means (9) comprises of a stud having an external screw thread, and that the locking member (15, 16] comprises of a first member (15), arranged to interlock with the stud (9), and a second protective member (16), said members of the locking member being arranged operable only by the use of a special purpose tool, adapted to said members (15, 16). 5. Device according to claim 1, 2, 3 or 4, characterised in that at least two connecting pins (6') are internally electrically connected to each other by means of a connecting member (7). 6. Device according to claim 1, 2, 3, 4 or 5, characterised in that the connecting pins (6, 6', 6") are arranged in such a configuration, that a component having co-acting tubular.connecting means (14) only can be attached in a predetermined relative position in relation to the connecting pins (6, 6', 6"). 7. Device according to claim 1, 2, 3, 4, 5 or 6, characterised in that the connecting pins (6, 6', 6") are attached to a base plate (5) having a mainly disc-shaped circular configuration, and that at least one periperal portion is removed from said base plate (5). 8. Device according to claim 1, 2, 3, 4, 5, 6 or 7, characterised in that the connecting pins (6, 6', 6") are arranged with through holes for electric wires, said holes extending transversely in relation to the length axis of said pins, said wires being arranged attachable in inserted position by means of an associated clamping member.

Inventors: DENCKERT L
Applicants: DENCKERT L
Application year: 1981
Main classification: H02G3
IPC codes: H01R13, H02G3