Electricity: conductors and insulators – Conduits – cables or conductors – Single duct conduits
Patent
1989-06-16
1991-11-26
Picard, Leo P.
Electricity: conductors and insulators
Conduits, cables or conductors
Single duct conduits
439460, H02G 308
Patent
active
050684957
DESCRIPTION:
BRIEF SUMMARY
The invention pertains to an electric socket for cable connections, especially an equipment socket or a connecting socket for use in cable channels, for passing through a cable into the inner chamber of the socket, formulated to be hard, and
Electric sockets of this type are used in interior chambers of different cable channels, especially railing channels. For this reason, they have special fastening devices, for example, legs provided with slits, which can be clipped over a profile projection in the interior cavity. They are intended for accommodating equipment, for example, switches, plugs, or the like, but can also be used as branch plugs, distributor plugs, etc. For introducing a cable into their interior, the recess is provided which in the previously known electric sockets is premanufactured but not yet formed and is produced as a circular opening. It can be made clear by breaking out; a stress relief device for the cable or a passage device, for example, a piece of rubber tubing, can be pressed into the circular opening thus formed.
Such electric sockets are relatively difficult to install. Passing a cable through the circular recess takes some effort, but the subsequent wiring of the ends of the cable introduced with a device, with other cables, or the like, is especially disadvantageous. Since the recesses are located close to the base, the cables open into the socket in the inner area of the side wall; their individual conductors must first be arched up out of the interior space to make them accessible. For this purpose, an adequate free length is usually left for each individual conductor so that the electrical connections can be conveniently produced outside the electric socket. Thus, the connection is far too long. This has the disadvantage that the individual conductors must be folded or looped to fit into the socket. In addition, during assembly, the wire ends project transversely to the base of the socket, and therefore, they must usually be bent over once again for connecting a device. This is tedious, and as a result of the excessive cable lengths which are nevertheless needed for installation, it is necessary to store the cable ends carefully within the socket.
This is where the invention comes in. It has posed the task of further developing the previously known electric socket of the type initially mentioned in such a way that, on the one hand, the introduction of the cable through the recess into the interior chamber of the socket is simplified, and on the other hand, the electrical connection to the conductors of the cable can be made more conveniently and in a shorter time.
Beginning from the electric socket of the initially mentioned type, this goal is achieved in that the recess has an inlet area in the vicinity of the upper free edge of the side wall, which is open to the top or closed via a bar, toward the base and recess a few millimeters wide, placed separately in the side wall, which narrows when a cable is pressed into the recess and thus gives the side walls of the recess elasticity.
In these recesses, the cables are no longer introduced transverse to the side wall through the round, perforated recess; instead they are pressed from the top, transverse to their cable access, into the recess. The side walls of the recess are provided, on the one hand with the retention projections, and on the other hand, are elastic, as a result of which they can retain the cable when it is pressed into the recess. As a result of the slits provided adjacent to the side walls of the recess but separate from the recess, it is possible to ensure that the side walls of the recess, despite the use of a hard formulated plastic, have an elasticity, so that upon pressing a cable into the recess, tapering toward the base, they become somewhat broader when an elastic clamping of the cable is achieved.
In other words, the provision of the slits ensures that a bar of plastic material a few millimeters wide remains between the corresponding side walls of the recess and the slit, which because of its small
REFERENCES:
patent: 551032 (1895-12-01), Hemphill
patent: 2503327 (1950-04-01), Fields
patent: 3574900 (1971-04-01), Emery
patent: 4416503 (1983-11-01), Hayes
patent: 4896403 (1990-01-01), Vouros
Picard Leo P.
Tone David A.
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