Implements or apparatus for applying pushing or pulling force – Method or apparatus for placement of conductive wire – Conduit snakes
Patent
1989-11-16
1991-12-24
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Method or apparatus for placement of conductive wire
Conduit snakes
H02G 906
Patent
active
050745271
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for retrospectively drawing cables into cable protection pipes, which are already provided with at least one cable, including a partition floor which may be inserted into the protection pipe and which is provided on both sides of its central region with a hollow tubular longitudinal edge which determines its level.
In one such device which is disclosed in German Patent Specification No. 34 27 788 the central region of the partition floor is flat on both surfaces thereof, and therefore has a uniform thickness along its cross-section. In practice during insertion it has been shown that because of the increasing friction between the forward region of the partition floor which is within the cable protection pipe, and the internal walls of the cable protection pipe or the previously laid cable, that region of the partition floor which is subsequently inserted buckles under the increasing pressure towards the forward end of the cable protection pipe, and after a further increase in pressure the buckle collapses towards the front of the partition floor, then a further buckle forms, which then collapses again, etc. This buckling insertion, which is attributable to the insufficient rigidity of the partition floor for this purpose, has the disadvantage however, that firstly insertion cannot be carried out continuously and that secondly the friction between the partition floor and the cable protection pipe or the cable contained therein is further increased. It would therefore appear to be worthwhile to further reduce the friction between the partition floor and the inner wall of the cable protection pipe as well as between the partition floor and the cable lying therein.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a device for retrospectively drawing a cable into a cable protection pipe of the type mentioned above, in which, as a result of reduced friction between the partition floor and the cable protection pipe internal wall or the cable already provided in the cable protection pipe, the partition floor can be inserted in longer strokes in a simpler and more continuous manner.
This object is achieved in a device for retrospectively drawing cables into a cable protection pipe of the type mentioned above, in that the central region of the partition floor is provided at its upper and/or lower surfaces with at least one reinforcing rib extending in the longitudinal direction of the partition floor.
The provision of reinforcing ribs increases the longitudinal rigidity of the partition floor such that the aforementioned buckling engagement of the partition floor when the friction between the partition floor and the cable protection pipe or the cable contained therein is too high, is avoided, and also the consequent additional friction because of the additional contact area between the partition floor and the cable protection pipe is avoided. Furthermore, the contact area between the partition floor and any cable which is lying in a somewhat undulating manner in the cable protection pipe is thus reduced to a minimum, so that in this way also the friction which must be overcome during insertion is reduced to a minimum. Also, the greasing effected to reduce friction between the partition floor and the previously laid cable can be restricted to narrow areas. In this regard, advantages are also presented in the case of pulling through an additional cable over the partition floor after the latter has been inserted.
When the reinforcing ribs on the upper surface and those on the lower surface of the central region of the partition floor are arranged in pairs lying directly opposite one another, an arrangement results which is symmetric about a central plane, which has the advantage that the partition floor can be inserted in any orientation.
When a pair of reinforcing ribs are arranged centrally in the central region of the partition floor the two hollow tubular longitudinal edges lie relatively close to one another, the ca
Kumpf Ursula
Watson Robert C.
LandOfFree
Device for retrospectively drawing cables into cable protection does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for retrospectively drawing cables into cable protection , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for retrospectively drawing cables into cable protection will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-39304