Pipes and tubular conduits – Combined – With means to support disparate element therein
Reexamination Certificate
2000-06-23
2001-11-06
Hook, James (Department: 3752)
Pipes and tubular conduits
Combined
With means to support disparate element therein
C138S112000, C248S049000, C248S068100, C211S181100, C206S443000, C206S446000
Reexamination Certificate
active
06311732
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a wire-mesh cable trough. More particularly this invention concerns such a trough intended to carry wires in a utility closet, equipment room, or the like.
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 upwardly 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.
The gauge of the wire used is increased for heavy-duty troughs. Thus such a trough is made identically to a light-duty trough, but of much thicker wire. As a result such heavy-duty troughs are often inordinately heavy, as the increase in strength and stiffness is associated by a disproportionate increase in mass.
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 quite strong so that it is suitable for heavy-duty use, but which is still relatively light.
SUMMARY OF THE INVENTION
A cable-guide trough has according to the invention a set of like U-shaped cross wires aligned with one another and lying in respective generally parallel and longitudinally spaced planes so as to form a trough with a horizontal floor and two upright sides. A set of generally parallel longitudinal wires is joined to the cross wires at the floor and sides. One of the sets is formed at the floor in upper and lower layers vertically flanking the other of the sets at the floor.
Such a system has been found to be very strong. The three-layer floor is extremely stiff. A standard heavy-duty system with a single layer of cross wires and a single layer of longitudinal wires of a diameter of 4.7 mm has a weight per unit of length of 6.9 kg. With the system of this invention using a four-layer floor and two-layer sides of wires all 3.1 mm thick the overall strength and stiffness is equal to or greater than that of the single-layer system, but the weight per unit of length is 5.5 kg.
The wires according to the invention are all of identical cross-sectional size and shape. Both sets of wires are formed as two layers in the trough floor to produce a four-layer floor.
In accordance with the invention each wire of the lower layer lies directly underneath a respective one of the wires of the upper layer. The one set can be the longitudinal wires or the cross wires in a three-layer system.
The one set is formed in the trough sides as inner and outer layers horizontally flanking the other of the sets at the trough sides.
REFERENCES:
patent: 3887073 (1975-06-01), Wilson
patent: 4064994 (1977-12-01), Ondrasik, II
patent: 4553523 (1985-11-01), Stohrer, Jr.
patent: 4597616 (1986-07-01), Trubiano
patent: 5423437 (1995-06-01), Kayem
patent: 5531410 (1996-07-01), Simon
patent: 5927658 (1999-07-01), Gerster
patent: 6138961 (2000-10-01), Zweig
Dubno Herbert
Hook James
Obo Bettermann GmbH & Co. KG
Wilford Andrew
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