Electricity: conductors and insulators – Conduits – cables or conductors – Single duct conduits
Patent
1996-10-11
1998-08-18
Kincaid, Kristine L.
Electricity: conductors and insulators
Conduits, cables or conductors
Single duct conduits
H02G 306
Patent
active
057960402
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an angled cable union with and without strain release, for electrical equipment.
The state of the art is based on 90.degree. cable unions consisting of only two enclosure sections, either connected rigidly or hinged to each other. For unions with hinged enclosure sections, an outwardly square-shaped enclosure is diagonally divided into the two triangular sections forming a hinge at the external corner of the enclosure, allowing the enclosure to be opened by 90.degree., with the two bores of the two sections thereby being aligned to form a straight cable union. This is followed by the enclosure being folded back for closing, with the cable being bent in a right angle as in rigid 90.degree. cable unions.
A disadvantage of both rigid and hinged cable unions is the high bending stress on the cable in the union. In addition, rigid cable unions require tedious pulling of the cable over an angle of 90.degree. and hinged cable unions are expensive to manufacture.
SUMMARY OF THE INVENTION
It is the aim of the invention to reduce stress on the cable and to facilitate pulling the cable through, without unduly increasing manufacturing costs.
The solution of this aim is an angled cable union for electrical equipment comprising an enclosure including at least two end sections having one continuous bore each, the axes of which intersect after assembly, wherein the end sections are connected with each other for entry and exit respectively of the cable by at least one intermediate section therebetween, the at least one intermediate section forming an obtuse angle to each of the adjacent end sections.
The advantage of this solution is reduced bending of the cable with an extended 90.degree. cable curvature through two easily-separable enclosure halves. When the two halves of the enclosure are joined, the cable deflection of 90.degree. is effected in two individual steps by means of at least one intermediate section, preferably a central section, of the enclosure.
In a preferred embodiment of the angled cable union according to the invention, the device has been designed to allow the halves of the enclosure to be rotated relative to one another after a cable has been pulled through both halves and the halves have been connected together.
Other useful embodiments of the angled cable union according to the invention include an engaging mechanism at the rotary connection of the two enclosure halves and a snap coupling of the two halves.
Angled cable unions having two enclosure sections are known from DE-A 36 14 198 and GB-A-2 253 458, having only end sections for entry and exit of the cable. These unions lack an intermediate section of the enclosure, in particular one central section of the same, with the effect that the cable after pulling in is bent in at least two points, with the main bend being more than 90.degree.. In these two prior art unions, the two mitred end sections abut in such a way that they allow preliminary collinear arrangement for passing the cable through, followed by being arranged in a right angle to each other.
The following is a detailed description of the invention based on several embodiments presented as examples in the drawings of the angled cable union according to the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1a is a part sectional, part elevational view of the first embodiment of the invention.
FIG. 1b is a part sectional, part elevational view of a variation of the first embodiment utilizing rectangularly-shaped tabs.
FIG. 1c is a part sectional, part elevational view of a variation of the first embodiment utilizing sawtooth shaped tabs.
FIG. 2 is a part sectional, part elevational view of an alternative to the first embodiment.
FIG. 3 is a part sectional, part elevational view of a second embodiment.
DETAILED DESCRIPTION
Where the described angled cable unions agree, the same reference numbers are used for identical or corresponding parts.
The embodiments described are more or less copied from the utility model DE-U-92 04 25
REFERENCES:
patent: 2366444 (1945-01-01), Dorman
patent: 4946202 (1990-08-01), Perricone
patent: 5276280 (1994-01-01), Ball
Jacob GmbH Elektrotechnische Fabrik
Kincaid Kristine L.
Waks Joseph
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