Implements or apparatus for applying pushing or pulling force – Method or apparatus for placement of conductive wire – Conduit snakes
Patent
1987-05-13
1988-12-27
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Method or apparatus for placement of conductive wire
Conduit snakes
B65H 5900
Patent
active
047935944
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for subsequent insertion of cables in ducts provided for this purpose, as defined by the preamble to claim 1.
In an apparatus of this kind known from German Pat. No. 32 31 027, the intermediate bottom provided with the bead-like longitudinal rims is relatively rigid, so that when it is inserted into relatively long cable ducts laid with relatively short radii, problems may arise because the friction between the inner wall of the duct and the intermediate bottom becomes very great, thus necessitating excessive forces for insertion of the intermediate bottom.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide an apparatus for the subsequent insertion of cables in ducts provided for this purpose as generically defined above, with which the intermediate bottom can be inserted In a simple manner, even with cable ducts laid with relatively short radii of curvature.
In an apparatus for the subsequent insertion of cables into ducts provided for this purpose as generically defined above, this object is attained by providing an intermediate bottom capable of being drawn into the duct, which is provided on both sides with a hollow bead-like longitudinal rim as a height guide and on its front with a cable guide, the rims being slit in the longitudinal direction.
By slitting the bead-like longitudinal rims, the torsional rigidity of the intermediate bottom is reduced substantially, so that during insertion into the cable duct the intermediate bottom can follow along the duct windings without a substantial increase in the force of friction between the duct inner wall and the edges of the intermediate bottom, even if the windings have a relatively short radius. This means that the force required for insertion of the intermediate bottom practically does not increase, even if relatively long cable ducts are laid with relatively short radii of curvature.
A further reduction in the torsional rigidity of the intermediate bottom is achieved in accordance with a preferred exemplary embodiment by providing the bead-like longitudinal rims with a hollow space of circular cross section and with a slit at one point on its circumference extending over its entire length. This also provides the further advantage that the provision of the slit can be done in a simple manner when the intermediate bottom is manufactured.
Suitably, the slit of one rim is provided in an upper circumferential region, and the slit of the other rim is provided in a lower circumferential region, that is, at circumferential regions remote from one another. Advantageously, the slits sever the wall of the hollow bead-like rim at an angle of preferably approximately 60.degree., so that in the closed state the rims overlap in the vicinity of the slits.
According to a further embodiment of the present invention, a cable is insertable into the circular hollow bead-like rim, Which can be done either prior t the insertion of the intermediate bottom or afterward with the aid of a tension cable or the like.
In the above-mentioned known apparatus, a roller toward the front end is provided with a hollow throat extending continuously around it over the entire length, which may present problems in moving over the already-laid cable or cables. According to a further exemplary embodiment of the present invention, the front roller is therefore embodied as barrel-shaped, so that the already laid cables can be distributed toward the outside as needed by the roller; this is more advantageous than in the case of the known roller, in which these cables tend instead to be forced inward
Further details of the invention are included in the ensuing description, in which the invention is described in further detail in terms of the exemplary embodiment shown in the drawing. Shown are:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates in a partially cut-away side view, an apparatus for the subsequent laying of a cable in a cable duct, in accordance with a preferred exemplary embodi
Ursula Kumpf
Watson Robert C.
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