Pipes and tubular conduits – Longitudinally seamed – Sectional
Patent
1998-05-05
2000-02-29
Kashnikow, Andres
Pipes and tubular conduits
Longitudinally seamed
Sectional
174 65R, F16L 922, H02G 306
Patent
active
060297131
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a lid clamp channel with one or opposite locking device(s) for attaching the clamp to one or both side walls of the electric cable conduit, as well as to a method of its manufacturing.
Electric cable conduits are available in a plurality of forms and shapes. A preferable embodiment of a electric cable conduit is disclosed in European document EP-A-111 799.3 in which there is described a electric cable conduit section formed as a continuous band with wall section-forming segments extending in a longitudinal direction, and with the sections being connected with each other by deformable web hinges which enable the wall section to swing open by 90.degree., providing a electric cable conduit. In this position, the wall section are held by appropriate locking means.
For such electric cable conduit s, there are provided so-called lid clamps which primarily are used as an auxiliary means during assembly. E.g., these lid clamps are secured to one of side walls of the electric cable conduit so that they extend at an angle to the electric cable conduit. Through the opening, which exists between the lid clamp and the electric cable conduit, conductors are inserted. It is insured that these conductors would not fall out of the electric cable conduit.
With an overhead assembly, the lid clamp is attached at opposite sides of a electric cable conduit so that it supports the cable weight. This insures that the cable does not lie on the covering lid of the electric cable conduit itself, which lid, advantageously, should be releasably connected with the side walls. In this case, the lid clamp prevents application of a too high weight pressure to the conduit lid.
Further, such lid clamps provide for the side wall stabilization as they form an abutment for a later mountable conduit lid. With this, the electric cable conduit lid is held with a light preload. Still further, the lid clamps serve as clamping means for stabilizing additional separation walls inside the conduit.
Also known are partial lid clamps which, e.g., insure access only to one predetermined chamber, while all other chambers of the electric cable conduit remain closed.
The drawbacks of the known lid clamp consists primarily in their relatively expensive manufacturing due to the use of complicated form tools and their limited handling possibilities, and also in that for their handling, as a rule, two hands need to be used.
The object of the present invention is to eliminate these drawbacks.
This object is achieved, in the first place, by providing a lid clamp having at least one wing connected by a flexible hinge with a second hinge or an intermediate member.
According to the method of the present invention, the at least one wing is formed, connected with another part of the lid clamp by a flexible hinge, in an extrusion (co-extrusion) process, so that a hinge is provided which is not damaged even at a repeated use or when used at a relatively low temperatures. Advantageously, e.g., a non-rigid PVC is used for the wing and another part of a lid clamp.
The manufacturing in a form of a continuous profile has an advantage consisting in that a lid clamp of a predetermined width can be cut off of this continuous profile.
An arrangement of an intermediate member, e.g., between two wings is recommended, first of all, when the electric cable conduit is separated with a central wall into two chambers or compartments. In this case, the intermediate member can be mounted on the central wall, with each wing bridging one compartment. There exists a possibility that one wing would be in its closed position while the other wing is open. Then, corresponding conductors can be inserted into the other chamber, whereas the conductors in the first chamber are secured with the closed wing.
A further feature of the present invention relates to a locking device. This one has a detent deflectable in a direction transverse to the longitudinal direction of the electric cable conduit and which, in a closed position, forms a locking connection with a hook provided
REFERENCES:
patent: 3757031 (1973-09-01), Izraeli
patent: 3927698 (1975-12-01), Johannsen
patent: 4214803 (1980-07-01), McKee et al.
patent: 4942271 (1990-07-01), Corsi et al.
patent: 4990721 (1991-02-01), Sheehan
patent: 5620333 (1997-04-01), Boyle
Hilti Aktiengesellschaft
Hwu Davis
Kashnikow Andres
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