DESCRIPTION

The present invention relates to an improved device for the fastening of cables, tubular bodies and other elongated bodies in general, having a differentiated diameter .

The field of the invention relates to devices used for fastening elongated bodies in general, such as cables, tubular bodies and the like, on a support, for example on pylons used for supporting telecommunication antennas .

In this field, it is important that the supporting device exert an effective supporting action on the cable, preventing it from slipping or moving out of its seat, due to its own weight or the action of atmospheric agents.

In this type of application, there is also the requirement of making the fastening device as universal as possible with respect to the different construction diameters of the cables, from the smallest, such as, for example, optical fiber cables, to those having a larger diameter, such as coaxial cables.

For this purpose, fastening devices are known, consisting of two saddles made of rigid plastic material, reciprocally coupled and suitable for being tightened around the cable.

In order to allow the dimensions of these saddles to be compatible with cables having different diameters, thus enabling them to be effectively fixed and withheld on the device, protrusions having suitable dimensions are known to be provided in the calibrated seat that receives the cable inside each saddle.

The main drawback linked to these known embodiments lies in the fact that whereas the above protrusions, on the one hand, are effective for withholding cables having a smaller diameter, on the other, they damage the outer surface of cables having a larger diameter.

The same protrusions also represent an obstacle for the use of known devices on cables having large differences in diameter, as the height of these inner protrusions cannot exceed an upper limit over which damage to the cables with a larger diameter would no longer be acceptable .

In order to overcome this drawback, the insertion of sheaths made of an elastic material is known, which are suitable for protecting the surface of the cable resting inside the relative seat in the saddles of the device. This known solution, however, has the disadvantage of increasing the cost of the fastening device, due to the increased number of components and quantity of material used .

EP 0 647 997 Al relates to a device for the fastening of cables, in which elastic tabs are secured to corresponding half cheeks mounted to transversal sides of the shells with respect to the longitudinal axis of the cable .

US 2007/120635 Al discloses a noise filter in which a cable is fastened by means of holding portions provided extending from the bottom wall portions of corresponding case portions.

The main objective of the present invention is to provide an improved device for the fastening of cables, tubular bodies and other elongated bodies in general, having a differentiated diameter, said device, unlike known devices of the known type, being compatible with cables having even very different diameters and without the necessity of resorting to the use of sheaths to avoid damage to their outer surface.

These and other objectives are achieved with the device of claim 1. Preferred embodiments of the device of the invention are specified in the remaining claims.

With respect to devices of the known art, the device according to the invention offers the advantage of allowing cables having very different diameters to be effectively fastened, also without the necessity of resorting to the use of traditional sheaths and without damaging the surface. In this way, the device of the invention is made compatible with cables having different diameters, without having to bear extra costs due to the use of known sheaths.

The device of the invention also offers the advantage of allowing the force with which it holds the cable, to be calibrated, thanks to the flexible behaviour of the tongues with which it is equipped. In particular, the above-mentioned tongues, thanks to their flexible behaviour, are able to respond to the deformations imposed by engagement with cables having a larger diameter, with a corresponding thrust having a proportional intensity. The device of the invention consequently allows the fastening stress of the cable to be regulated in relation to the diameter and therefore also the weight of the same, thus also ensuring the retention of heavier cables.

These and other objectives, advantages and characteristics are evident from the following description of preferred embodiments of the device of the invention, illustrated for illustrative and non-limiting purposes in the figures of the enclosed drawings.

In these: figure 1 illustrates an example of a fastening device of the type to which the invention relates; figures 2 and 3 respectively illustrate in a front and upper view, a saddle of a fastening device according to the known art;

figures 4 and 5 respectively illustrate in a front and upper view, an example of a saddle of the device according to the invention;

figure 6 illustrates a perspective view, of the saddle of figures 4 and 5;

figures 7 and 9 illustrate in a perspective view, the fastening mode of cables having a different diameter on the device of the invention;

figures 8 and 10 illustrate in a front view, the deformation of the tongues imposed by their engagement with cables having a smaller and larger diameter respectively; and

figures 11 and 12 illustrate respective variants of the device of figure 4.

The fastening device illustrated in figure 1 is indicated as a whole with reference number 1. In particular, it consists of a body 2 obtained by the coupling of two saddles 3 and 4, held in a closed position on the respective cable 5 by means of a threaded bar 6, in turn provided with a clamp 7 for the anchorage of the same device 1 to the corresponding support 8. Each saddle 3,4 is in turn provided with semicircular seats 9, in which the respective cable 5 is housed.

In accordance with the known art illustrated in figures 2 and 3, the internal surface of the above- mentioned semicircular seats 9 has protruding teeth 10, whose function is to compensate, with their height, the differences in diameter of the cables to be fixed onto the device 1. As already explained, however, these teeth must not be excessively high as, in this case, whereas they are effective for holding cables having a smaller diameter, they cause inevitable damage to cables with a larger diameter.

In order to overcome this drawback, the device according to the invention provides seats 11a and lib, whose housing seat 12 of the cable 5 is composed of a rigid frame 23 to which a plurality of elastically deformable tongues 13,14 is secured.

In particular, and as is better represented in figure 6, the frame 23 of each seat 11a, lib has sides 15 and 17 which are directed towards the longitudinal axis of the cable to be withheld, and sides 16 and 18 having a curvilinear profile which follows the circular transversal semi-section of the cable. A row of tongues 13 is fastened on the side 15 of said frame 23, in correspondence with their end 19, the free end 21 of the same tongues being raised, in rest position, towards the interior of the housing seat 12 of the cab le 5. A row of tongues 14, on the other hand, is fastened on the opposite side 17 of the same frame 23, in correspondence with their end 20, whose free end 22 is also raised, when in rest position, towards the interior of the housing seat 12 of the cable 5. The two rows of tongues 13 and 14 also have a substantially comb-like distribution, with the tongues 13 positioned within the spaces separating the tongues 14.

Thanks to the invention, the fastening device is compatible with cables having smaller diameters, as illustrated in figures 7 and 8, in which the tongues 13 and 14 are only partially bent, and also with cables 5 having a larger diameter, as illustrated in figures 9 and 10, in which the tongues 13 and 14 are fully bent, i.e. so as to bring them to the bottom of the housing seat 12 of the cable 5, in turn defined by the sides 16,18 of the frame 23.

In the variant illustrated in figure 11, the tongues 13 and 14 are provided with protruding notches 24, suitable for favouring the grip on the cable to be fastened, without however damaging the outer surface, thanks to the flexibility of said tongues. In the variant illustrated in figure 12, the conformation of the tongues 13 and 14 is no longer concave, such as that represented in the previous figures, but convex, i.e. facing the cable 5.

For comparative purposes, in the following table, a fastening device according to the known art, as illustrated in the previous figures 2 and 3, is compared with the device of the invention.

It can thus be observed that, with the same diameter of the cable housing, the device of the invention is compatible with cables having very different diameters, which fall within a greater range than that allowed by analogous devices of the known art.

The device described above and illustrated in the enclosed drawings can obviously undergo further modifications, to achieve variants which, even if not described and represented in the figures, should be considered as being included within the scope of the following claims. The number of seats 12 present on the saddles 11a and lib, for example, can be different from that illustrated in the figures, so as to fasten only one cable or more than two cables 5.