Arrangement for fastening a plug, and a plug

Abstract: The invention relates to an arrangement for fastening a plug (1) into the edges (13) and (14) of an opening of a case (12). In the arrangement of the invention, the plug (1) comprises, in connection therewith, fastening portions (4a, 4b) and grooves (11a, 11b) of varying depths for fastening the plug (1) into the case (12) opening. The arrangement also comprises a flexible element (7) for arranging the plug (1) into the case (12) opening. The invention further relates to a plug (1) to be arranged into the edges (13) and (14) of an opening of the case (12). The plug (1) comprises, in connection therewith, fastening portions (4a, 4b) and grooves (11a, 11b) of varying depths for fastening the plug (1) into the edges (13) and (14) of the case (12) opening, and a flexible element (7) to be placed at the bottom of the deeper groove (11a) for arranging the plug (1) into the case (12) opening.

Description: The invention relates to an arrangement for fastening a plug into an opening between two mutually parallel edges, the arrangement comprising at least one fastening portion, at least two grooves and at least one flexible element in connection with the plug. The invention also relates to a plug comprising, in connection therewith, at least one fastening portion, at least two grooves and at least one flexible element. Plugs are commonly used for example for connecting electric wires and data cables into electric appliances. Plugs are typically fastened using screws. A fastening made by means of screws is slow and requires separate tools to be used during fastening. A fastening made by screws is also much too difficult particularly in such arrangements, in which the plug has to be detached, may be more than once, in order to change the internal order of the wires to be coupled to the plug or in order to couple new wires. It is known in the art to use panel mounting fasteners, which are fastening portions to be separately mounted into the plug, for fastening a plug into an opening formed in a case or between two mounting busbars. A panel mounting fastener comprises a body and flexible strips made of the same material as the body and arranged to the body of the fastening portion, the strips having a substantially rounded groove, into which an edge of the case opening is placed. A panel mounting fastener is fastened at both ends of the plug so that the plug is fastened in the direction of its ends into the case opening using the flexible strips. The drawback with panel mounting fasteners is that the same flexible strips enable to mount the plug into the case opening and form a joint between the edge of the case opening, in which case the joint is not solid enough. Moreover, as the body of the panel mounting fastener and the flexible strips in the fastener form an integral part, the panel mounting fasteners have to be made of such a material that endures bending without breaking. Such a panel mounting fastener is described in document US-A-4 717 358. It is an object of this invention to provide a simple and reliable arrangement enabling rapid fastening in order to fasten a plug comprising, in connection therewith, means for tightly fastening the plug, as claimed in claims 1 and 12. The essential idea is that in order to fasten the plug into an opening between two mutually parallel edges, the plug comprises in connection therewith at least one fastening portion, at least two grooves and at least one flexible element so that the grooves are directed outwards from the plug and in that the body, the body part and the cover of the fastening portion form at least the groove arranged against a first edge, said groove being deeper than the groove arranged against a second edge, and that a flexible element is placed at the bottom of the deeper groove to enable the plug to be mounted into said opening. According to an embodiment the fastening portion is made into an integral structure together with the plug. The invention provides such an advantage that the plug can rapidly and easily be mounted and that no tools are needed during installation. The structure of the fastening portion is simple and reliable. The grooves ensure a solid fastening into the edges of the opening. The same fastening portions are applicable in plugs of varying sizes made by different manufacturers. When the plug is fastened to the case, no sub-case of the plug is required, thus saving costs. A further advantage of the invention is the simple form of the opening to be made into the case, on account of which the opening is easy to produce. In the following the invention is described in greater detail in the accompanying drawings, in which Figure 1 schematically shows an arrangement of the invention for fastening a plug and a plug of the invention, seen from above the plug and partly cut, Figure 2 schematically shows the arrangement of Figure 1 for fastening the plug, seen from the end of the plug, Figure 3 illustrates how the arrangement of the invention shown in Figures 1 and 2 is used for fastening the plug into an opening of the case, seen from the end of the plug and partly cut, and Figure 4 schematically shows a preferred embodiment of another arrangement of the invention for fastening a plug and a plug of the invention seen from the side of the plug. Figure 1 schematically shows an arrangement of the invention for fastening a plug 1, and a plug 1 of the invention, which employs two fastening portions 4a and 4b, both being fastened at the ends of the plug 1. Figure 2 illustrates the fastening portion 4a of the invention shown in Figure 1, seen from the end of the plug 1. For clarity, Figure 2 does not show the plug 1. The plug 1 comprises pins 2 for connecting data cable to the plug 1, for example. The plug 1 is fastened to the fastening portions 4a and 4b by fastening elements 3, which are preferably screws. The fastening portions 4a and 4b may be mirror images of one another. The fastening portions 4a and 4b comprise a body 5, into which a space 6 is formed for a flexible element 7. The body 5 is made of hard, inflexible material, such as plastic, using injection moulding. The flexible element 7 is an elastic element made of for example elastic material, such as rubber. The flexible element 7 can also be a coil spring, but what is essential is that the flexible element 7 is compressible and reversible. The crosscut form of the space 6 and the flexible element 7 may vary, as far as the crosscut forms of the space 6 and the flexible element 7 correspond with one another so that the flexible element 7 is firmly arranged into the space 6. The crosscut of the space 6 and the flexible element 7 preferably resembles a circle. A cover 8 is placed upon the body 5 and the flexible element 7. The cover 8 closes the element 7 into the space 6 so that the flexible element 7 cannot slip from the space 6 when the plug 1 is detached from the fastening object. The cover 8 forms an integral structure with the body 5. The cover 8 includes a hole 9 for fastening the cover of the counterpart of the plug 1. The hole 9 is preferably provided with threads, in which case the cover of the counterpart of the plug 1 can be fastened using screws. The cover 8 has been removed from the fastening portion 4a in Figure 1, and a body part 10 fixedly attached to the body 5 is revealed beneath the cover 8. The structure of the body 5, the body part 10 and the cover 8 of the fastening portions 4a and 4b is such that a groove 11a directed outwards from the plug 1 remains between the body 5 and the cover 8 at one end of the fastening portions 4a and 4b, and a groove 11b directed outwards from the plug 1 remains between the body 5 and the cover 8 at the other end of the fastening portions 4a and 4b. The grooves 11a and 11b are substantially rectangular as regards length, depth and height. The grooves 11a and 11b are entirely outside the outlines of the plug 1. The grooves 11a and 11b are also substantially parallel and substantially at the same level with one another. The depth of the groove 11a in the direction of the longitudinal axis of the flexible element 7 in Figure 1 exceeds the depth of the groove 11b. The space 6 and the flexible element 7 are arranged at the particular side of the fastening portions 4a and 4b, to which the groove is formed. The space 6 and the flexible element 7 are such in length that the flexible element 7 extends to the area of the groove 11a outlined by the body 5, the body part 10 and the cover 8 in order to enable the yielding movement needed during the installation of the plug 1. The flexible element 7 does not extend to the area of the groove 11b outlined by the body 5, the body part 10 and the cover 8, but is restricted to an area inside the body 5 and the body part 10. Figure 3 shows by way of example how the arrangement of the invention can be used for fastening the plug 1, seen from the end of the plug 1, when the fastening portion 4a is fastened into the edges 13 and 14 of an opening formed in a case 12. For clarity, Figure 3 does not show the plug 1. When mounting the plug 1, the edge 13 of the opening is arranged into the case 12 opening against the flexible elements 7 in the grooves 11a of the fastening portions 4a and 4b. After this, the fastening portions 4a and 4b are pressed against the edge 13 of the case 12 opening, whereby the flexible elements 7 are compressed so that the edge 14 of the case 12 opening can be directed to the grooves 11b of the fastening portions 4a and 4b. When detaching the grip, the flexible elements 7 expand and tighten the joint between the grooves 11a and 11b and the edges 13 and 14. The grooves 11a and 11b and the flexible element 7 ensure a solid fastening of the fastening portions 4a and 4b to the case 12 opening in the lateral and vertical direction of the case 12. Since the plug 1 is fastened into the edges 13 and 14 of the case 12 opening by means of the grooves 11a and 11b formed of the solid and hard surfaces of the fastening portions 4a and 4b, and since the compressibility of the flexible element 7 only allows the edges 13 and 14 of the case 12 opening to be directed into the grooves 11a and 11b, the plug 1 cannot by accident slip from the case 12. When detaching the plug 1 from the case 12, the fastening portions 4a and 4b are pressed against the edge 13 of the case 12 opening, in which case the edge 14 of the case 12 opening can be directed from the grooves 11b when the flexible elements 7 are compressed, and the plug 1 can thereafter be removed from the case 12 opening. Figure 4 schematically shows another embodiment of an arrangement of the invention for fastening the plug 1 and a plug 1 according to the invention, seen from the side of the plug 1. In the arrangement shown in Figure 4 fastening portions 4a and 4b are fastened to the plug 1 using fastening elements 3. The fastening portion 4a comprises a groove 11a which is directed outwards from the plug 1 and restricted by the body 5, the body part 10 and the cover 8, and a flexible element 7 is arranged at the bottom of the groove. The fastening portion 4b, in turn, comprises a groove 11b which is directed outwards from the plug 1 and restricted by the body 5, the body part 10 and the cover 8, and a flexible element 7 is not arranged at the bottom of the groove 11b. The use of the embodiment shown in Figure 4 corresponds with the one in Figure 3. The embodiment according to Figure 4 can also be implemented so as to form the groove 11b into the body of the plug 1, if the body of the plug 1 is solid enough to endure the load caused by fastening, in which case no fastening portion 4b is required. According to a preferred embodiment of the invention the fastening portions 4a and 4b are formed into an integral structure with the plug 1 during the fabrication of the plug 1, whereby no separate fastening elements 3 are required for fastening the plug 1 to the fastening portions 4a and 4b. The drawing and the specification associated thereto are merely intended to illustrate the inventive idea. The details of the invention may vary within the scope of the claims. Hence, the appearance and the structure of the plug 1 and the fastening portions 4a and 4b may vary from what is illustrated in Figures 1 to 4, whereas the principle of the invention remains the same. The scale of dimensions of the plug 1 and the fastening portions 4a and 4b may vary from what is shown in Figures 1 to 4. Furthermore, the plug 1 can be fastened to the case 12 from above or below the opening. The fastening object of the plug 1 is not necessarily the case opening but it may also be placed between two parallel busbars or in a corresponding opening between two mutually parallel edges. Several plugs 1 can also at first be fastened together to form a line of plugs, and the fastening portions 4a and 4b can be used for fastening the line of plugs. If the plug 1 and the fastening portions 4a and 4b form separate structures, other corresponding fastening elements 3 can be used instead of screws as the fastening elements 3 in order to fasten the plug 1 to the fastening portions 4a and 4b, or the fastening portions 4a and 4b can be provided with grooves and the plug 1 can be fastened to the locking pins in the grooves by pressing.

Claims: An arrangement for fastening a plug into an opening between two mutually parallel edges, the arrangement comprising at least one fastening portion (4a, 4b), at least two grooves (11a, 11b) and at least one flexible element (7) in connection with the plug (1), wherein the grooves (11a, 11b) are directed outwards from the plug (1), and a body (5), a body part (10) and a cover (8) of at least one fastening portion (4a, 4b) form the first groove (11a) arranged against a first edge (13), and the second groove (11b) is arranged against a second edge (14), and the groove (11a) arranged against the first edge (13) is deeper than the groove (11b) arranged against the second edge (14), characterized in that the flexible element (7) is placed at the bottom of the deeper groove (11a). An arrangement as claimed in claim 1, characterized in that the body (5), the body part (10) and the cover (8) of the fastening portion (4a, 4b) form the shallower groove (11b), which is arranged into the same fastening portion (4a, 4b) in connection with the plug (1) as the deeper groove (11a) on the opposite side of the plug (1). An arrangement as claimed in claim 1, characterized in that the body (5), the body part (10) and the cover (8) of the fastening portion (4a, 4b) form the shallower groove (11b), which is arranged into a different fastening portion (4a, 4b) in connection with the plug (1) than the deeper groove (11a) on the opposite side of the plug (1). An arrangement as claimed in claim 1, characterized in that the shallower groove (11b) is arranged into the body of the plug (1) on the opposite side of the plug (1) than the deeper groove (11a). An arrangement as claimed in claim 2 or 3, characterized in that the plug (1) is fastened using two fastening portions (4a, 4b) in the plug (1) on the opposite side of the plug (1). An arrangement as claimed in any one of the preceding claims, characterized in that the grooves (11a, 11b) are substantially at the same level. An arrangement as claimed in any one of the preceding claims, characterized in that the grooves (11a, 11b) are substantially rectangular. An arrangement as claimed in any one of the preceding claims, characterized in that the flexible element (7) is compressible and reversible. An arrangement as claimed in claim 8, characterized in that the flexible element (7) is a coil spring. An arrangement as claimed in claim 8, characterized in that the flexible element (7) is made of elastic material. An arrangement as claimed in claim 10, characterized in that the flexible element (7) is made of rubber. A plug comprising, in connection therewith, at least one fastening portion (4a, 4b), at least two grooves (11a, 11b) and at least one flexible element (7), wherein at least one fastening portion (4a, 4b) in connection with the plug (1) comprises at least one first groove (11a) formed of a body (5), a body part (10) and a cover (8) of the fastening portion (4a, 4b) and directed outwards from the plug (1), and the second groove (11b) in connection with the plug is directed substantially in the opposite direction from the plug (1) as regards the first groove (11a) and is shallower than the first groove (11a), characterized in that the flexible element (7) is placed at the bottom of the first groove. A plug as claimed in claim 12, characterized in that the shallower groove (11b) is formed by the body (5), the body part (10) and the cover (8) of the fastening portion (4a, 4b), and the shallower groove (11b) is arranged into the same fastening portion (4a, 4b) in connection with the plug (1) as the deeper groove (11a) on the opposite side of the plug (1). A plug as claimed in claim 12, characterized in that the shallower groove (11b) is formed by the body (5), the body part (10) and the cover (8) of the fastening portion (4a, 4b), and the shallower groove (11b) is arranged into a different fastening portion (4a, 4b) in connection with the plug (1) than the deeper groove (11a) on the opposite side of the plug (1). A plug as claimed in claim 12, characterized in that the shallower groove (11b) is arranged to the body of the plug (1) on the opposite side of the plug (1) than the deeper groove (11a). A plug as claimed in any one of claims 12 to 15, characterized in that the grooves (11a, 11b) are substantially at the same level. A plug as claimed in any one of claims 12 to 16, characterized in that the grooves (11a, 11b) are substantially rectangular. A plug as claimed in any one of claims 12 to 17, characterized in that the body (5), the body part (10) and the cover (8) of the fastening portion (4a, 4b) form an integral structure. A plug as claimed in any one of claims 12 to 18, characterized in that the fastening portion (4a, 4b) forms an integral structure with the plug (1). A plug as claimed in any one of claims 12 to 18, characterized in that the plug (1) is fastened to the fastening portion (4a, 4b) using fastening elements (3). A plug as claimed in claim 20, characterized in that the fastening element (3) is a screw. A plug as claimed in claim 20, characterized in that the fastening element (3) is a locking pin in the fastening portion (4a, 4b). A plug as claimed in any one of claims 12 to 22, characterized in that the flexible element (7) is compressible and reversible. A plug as claimed in claim 23, characterized in that the flexible element (7) is a coil spring. A plug as claimed in claim 23, characterized in that the flexible element (7) is made of elastic material. A plug as claimed in claim 25, characterized in that the flexible element (7) is made of rubber.

Inventors: KIVINIITTY ARI, KIVINIITTY, ARI
Applicants: KCI KONECRANES PLC
Application year: 2000
Main classification: H01R13
IPC codes: H01R13