Electricity: conductors and insulators – Overhead – Towers – poles or posts
Reexamination Certificate
1999-07-06
2001-05-29
Reichard, Dean A (Department: 2831)
Electricity: conductors and insulators
Overhead
Towers, poles or posts
C174S0450TD
Reexamination Certificate
active
06239364
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a guide trough for cables. More particularly this invention concerns such a trough made modularly of wire mesh.
BACKGROUND OF THE INVENTION
Wire-mesh troughs are typically used to hold wires and cables in such a manner that they are solidly supported yet readily accessible. Thus it is standard to provide such troughs adjacent the ceiling in computer rooms and the like.
The typical trough is made of a plurality of relatively stiff longitudinal rods and at least two crosswise U-shaped rods to which they are welded, for instance with four longitudinal rods at the base of the U-shaped cross rod and two more longitudinal rods forming sides of the trough and secured to the up-wardly pointing arms of the cross rods. Of course angled troughs are provided for going around corners and changing levels and T- or X-shaped troughs are provided for forming intersections where several such troughs are joined together.
All these wire-mesh structures typically end at a standardized U-shaped end defined by a single cross rod and the ends of the longitudinal rods. This makes it possible to join the various structures together into any shape, achieving a relatively good custom fit.
To this end the structures to be joined are typically butted endwise and secured together with clips. As described in commonly owned U.S. patent application Ser. No. 09/159,486 a clip is used with a pair of wire troughs having a cross U-shaped end rod of predetermined diameter joined to ends of longitudinal rods. The clip is U-shaped and engaged around the end rods between a respective pair of the longitudinal rods. It has a floor engaging the two end rods and is formed with a pair of flanks each engaging a respective one of the ends rods and each formed with a respective formation retaining the respective end rod against the floor. A similar clip-connecting system is described in German patent document 690 14 509. The disadvantage of these systems is that these separate clips not only constitute a separate element that needs to be manufactured and provided with the troughs, but they can get lost or knocked loose, making it impossible to join the troughs together.
As described in German patent document 693 04416 it is also known to provide separate connector bars on the sides of the troughs that project from one end and can be slipped around the cross bars of another trough to join two such troughs together. These bars have the advantage that they are fixed on the troughs so they cannot get lost or come loose. Nonetheless they add to the manufacturing costs of the troughs and create a clear and unattractive demarcation between adjacent troughs. Furthermore at the end of the trough it is necessary to leave the clips protruding, producing an unattractive appearance, or to break them off which is an extra step and also often results in a rough broken end.
OBJECTS OF THE INVENTION
It is therefore an object of the present invention to provide an improved wire-mesh cable trough.
Another object is the provision of such an improved wire-mesh cable trough which overcomes the above-given disadvantages, that is which is easy to join together without the use of extra parts and that creates an attractive and neat assembly when joined together.
SUMMARY OF THE INVENTION
A cable-guide trough has according to the invention a row of like U-shaped cross bars aligned with one another and lying in respective generally parallel and longitudinally spaced planes and a plurality of generally parallel longitudinal bars joined to the cross bars and each having a first laterally deflected end portion carrying a first one of the cross bars and an opposite second end portion carrying a second one of the cross bars. The first cross bar and the first and portions are dimensioned to nest with the second the cross bar and second end portions of another such trough to couple the troughs together.
Thus with this system no separate clips or structure are provided. Instead the narrow end of one trough is simple fitted crosswise to the wider end of another such trough to lock the two together, completely without the use of any separate parts or tools.
According to the invention the trough has two such first cross bars spaced longitudinally apart by a distance equal generally to a diameter of the second cross bar so that the second cross bar of one trough can fit between the first bars of another such trough. It can also have has three such first cross bars and two such second cross bars spaced longitudinally apart by a distance equal generally to a diameter of the cross bars so that the second cross bars of one trough can fit between the first bars of another such trough.
Normally in accordance with the invention all the cross bars except the first cross bar are mounted inside the longitudinal bars. The first cross bar is mounted outside the laterally deflected first end portions of the longitudinal bars. In addition all the rods are of substantially the same diameter and the first end portions are deflected laterally by a distance equal substantially to the diameter.
The first end portions according to the invention can be deflected outward and the second end portions inward. Alternately the first end portions can be deflected inward and the second end portions outward. In the latter case all the rods are of substantially the same diameter and the first end portions are deflected inward by a distance equal substantial to half the diameter and the second end portions are deflected outward by a distance also equal substantially to half the diameter. The term “inward” here means that the end portions of the bars of the floor of the trough are offset upward but parallel to the longitudinal centerline of the trough and the end portions of the bars of the sides are offset inward toward each other.
In another arrangement according to the invention all of the cross bars are spaced generally uniformly and the first end portions carry two such first cross bars and the second end portions carry two such second cross bars. This ensures a substantial overlap at the connection region for a very rigid connection.
The first and second cross bars are formed with formations that fit together on engagement of a first cross bar of one trough with a second cross bar of another trough. Thus the two troughs can be clicked or snapped together to form an assembly that is unlikely to come apart in normal use.
REFERENCES:
patent: D. 322596 (1991-12-01), Henneberger
patent: 5067678 (1991-11-01), Henneberger et al.
patent: 5531410 (1996-07-01), Simon
patent: 5927658 (1999-07-01), Gester
patent: 6037538 (2000-03-01), Brooks
patent: 6082690 (2000-06-01), Durin et al.
patent: 690 14 509 (1995-08-01), None
patent: 693 04 416 (1997-04-01), None
Dubno Herbert
Estrada Angel R.
Otto Bettermann GmbH & Co. KG
Reichard Dean A
Wilford Andrew
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