The subject-matter of the invention is a device for supporting and operating a cable drum, and a service trailer comprising said device.

The construction of infrastructure along with the installation of fibre-optic networks requires the use of appropriate precision devices and support equipment. Specialised equipment must be packed, secured, and transported to the installation/assembly sites where it is set up, arranged and connected.

From the Polish application description PL4198561 Al, a pilot rope unwinder is known, made of a steel frame consisting of four removable parts in the form of two supports and two beams; a tubular steel axis for the operating drum, on one end with a hole for bolting the bearing on, and on the other with a shank enabling possible connection of a drive; steel flange with bolts with a spacing matching the working drums and a centring hole matching the tubular axis; two ball bearings placed in a clamping bracket, bolted together.

From the Polish patent specification PL233144 Bl, a service vehicle with a two-axle chassis and a box placed on it is known, wherein the said chassis is equipped with at least some of permanently fixed or detachably connected to it, or freely placed on it subassemblies and elements, which are: ultra-light service poles, reusable service cable (preferably wound on a drum) and a junction box, a steel formed cover, hooks, pass-through clamps, grounding probes, grounding cables and electrical sockets, battery or power generator, at least one guide being a guide with brushes, a drum under which there is a winder mechanism, as well as small accessories. The aforementioned small accessories include: guy ropes, rollers, tools, lighting mast, service Kevlar guy, electrical sockets, as well as guides built into the box to run the service cable on them. The winding mechanism is electrically driven and the winder is usually controlled by a wireless remote control, is suitably powered by a power generator or a battery and is preferably provided with a self-cleaning device for removing dirt from the cable arisen during winding of the cable on the reel.

From a UK application description GB2224092 A a device is known for delivering an elongated element (e.g., a cable) consisting of a bracket, a frame mounted on the bracket and two rollers mounted on the frame and arranged in a V-shape to support and guide the element during delivery. The frame includes a lower part and an upper part (preferably telescopic) on which rollers are mounted and which is adjustable (preferably by an adjustment screw) relative to the lower part. Preferably, the device is provided with stops for locking the parts in a relatively adjusted position. Furthermore, in a preferable embodiment, the disclosed device is constructed as a trailer having a chassis and jacks positioned on the chassis for securing the chassis at a desired location.

From the US application description US2014086688 A1 a cable trailer is known, used for supporting a cable reel weighing up to 10 tons and for laying the cable in a trench or along a trench. The trailer consists of a trailer chassis provided with an inner opening and enclosed by a tailgate that can be opened or removed to provide access to the space of the inner opening; two mounting arms for securing the cable reel, said mounting arms being spaced apart through the inner hole and substantially equidistant from the tailgate; a bridge with a cable guide to facilitate the removal of the cable from the cable drum; at least one cable support arm extends from the side of the undercarriage; a plurality of cable guides arranged on at least one cable support arm to facilitate steering the cable; and a hydraulic actuator system for positioning at least one cable support arm and securing the cable drum to the mounting arms; while in use, the cable dmm is mounted on mounting arms in the space of the inner opening, and the cable is guided through the cable guide and cable guides into the ditch.

From the Polish patent specification PL134585 B1 a transport device is known, especially for transporting materials on drums and for unwinding and winding them, equipped with a chassis frame with a closed structure with extendible supports, mounted on a wheel set and equipped with a dmm drive mechanism, having a dmm carrier unit set in motion with a hydraulic cylinder. The device is characterized in that the dmm support assembly has a tiltable frame supported pivotally on the chassis frame, the frame being preferably H-shaped and offset to the back relative to the chassis frame. Preferably, carriages for moving the load are arranged in the frame, provided with running elements, preferably rolling. Preferably, a drive mechanism of the carriages is arranged in the front part of the tilting frame.

The frame, on the other hand, is mounted on bases connected to a hydraulic cylinder on one side and brackets on the other. Preferably, the ends of the tilting frame have a telescopically extendible element. Moreover, in a preferred embodiment of the disclosure, a roller is arranged on its upper surface in the front part of the chassis frame, with a length corresponding to the width of the chassis frame, which constitutes the bearing element of the chassis frame and serves to drive the drum. Preferably, the chassis frame is provided with a floor and there is a box on the frame. In preferred embodiments, openings are provided in the side walls of the carriages in which fasteners are provided for supporting the drums.

The aim of the invention was to provide a device for improving the efficiency of building fibre-optic infrastmcture. Another aim of the invention was to create a multi-purpose mobile device constituting a complete device for the assembly of fibre-optic infrastructure.

The essence of the invention is a device for supporting and operating a cable drum, equipped with a rectangular frame and a locking-release mechanism, characterised in that a sliding carriage equipped with tensioning is mounted on the main frame, wherein said sliding carriage is in the shape of a rectangle, open on one side, which is the front part of a sliding carriage, in addition, the main frame is equipped with a locking-release mechanism mounted on both sides of the main frame on its longitudinal sides; in the centre of the front transverse part of the main frame there is a winch connected to the drive; in the longitudinal part, the main frame consists of two parallel to each other semi-closed channels mounted upwards with the open part of the channels, and in the centre of each semi-closed channel of the longitudinal part of the main frame there are support rollers, which are attached to a sliding carriage mounted on the main frame; a triangular boom with swivel arms is mounted in the front, open part of the sliding carriage by means of bolts; in the upper part of each of the swivel arms of the triangular boom, clamping yokes are mounted, equipped with quadruple bearing sleeves and mounting the support bar, secured with threaded cranks constituting the closing mechanism of the clamping yokes; the winch is connected via a cable successively to the first tensioning roller located in the rear transverse part of the main frame, the second tensioning roller located in the rear part of the sliding carriage and to the third tensioning roller located on the triangular boom.

Preferably, the bar comprises two sliding discs.

Preferably, the device comprises a securing fixture of the triangular boom in the form of braces.

Preferably, the device comprises a sliding carriage safety device, which is a bolt grip made of a sleeve fixed on the main frame and a sleeve in the sliding carriage.

Preferably, the drive is selected from the group consisting of a mechanical, electric, hydraulic or pneumatic drive. Preferably, the drive is equipped with a controller for wired or wireless control.

Another subject of the invention is a service trailer, especially for transporting materials on drums, equipped with a chassis frame mounted on a wheelset and provided with a floor plate, a front wall, two side walls and a ceiling plate, characterised in that a device according to the invention is mounted in its rear part, while in the front part there is a frame for fastening the compressor and an air dryer connected to it, from which a compressed air system leads towards the rear of the trailer and ends with a valve and a connector; side door is located in the right side wall of the trailer at the height of the frame with the compressor and air dryer installed; in the front wall there is a hot air outlet and a fuel inlet for refuelling the compressor, while in the left side wall there is an air inlet for the screw compressor.

Preferably, the frame ends at the top with a shelf for mounting accessories.

Preferably, the compressed air system in the section from the air dryer to the device is stretched along the inner side of the right side of the trailer, and at the height of the device there is a vertical section of the compressed air system leading to the inner side of the trailer ceiling plate, from where the compressed air system is routed to the edge of the ceiling plate of the rear of the trailer.

Preferably, the trailer according to the invention contains supports.

Preferably, the trailer according to the invention is provided with a closing part in the form of a tailgate or a rear door.

The invention provides the following advantages; it:

• Accelerates the pace of work;

• Enables easier loading, transport and assembly;

• Two persons are sufficient to load, transport, handle and install the infrastructure;

• Enables a reduction of loading time by about 15-20 minutes compared to the existing solutions;

• Eliminates the need to unload and set up the equipment at the work site, because it is enough to properly position the trailer according to the invention in relation to the work site;

• The smaller dimensions of the trailer according to the invention facilitate its parking — the required space, which is necessary for parking / positioning the trailer during assembly operations, is much smaller than the hitherto required - approx. 50% less space;

• During installation the trailer is self-powered and can stand alone in place. And the vehicle that transported the trailer can be unhitched/disconnected;

• During the installation process, appropriately designed modules/segments allow the job to be completed faster and more efficiently;

• Due to the absence of the need to unload, there is no equipment, no accessories and no materials to be deployed. When moving the set to the next installation site to continue the work, there is no reloading and securing;

• It provides increased savings in the Logistics aspect, which in turn translates into greater efficiency and effectiveness of building fibre-optic infrastructure - efficiency increase in the range of 30-40%.

The invention is shown in embodiments in figures, where fig. 1 shows the device according to the invention in the rest position in isometric view; fig. 2 shows the device according to the invention in the rest position in a side view showing the tensioning device of the sliding carriage; fig. 3 shows the device according to the invention in the rest position in side view, detailing the support rollers of the sliding carriage; fig. 4 shows the device according to the invention in the rest position in top view; fig. 5 shows the device according to the invention in the extended position in isometric view; fig. 6 shows the device according to the invention in the extended position in a side view; fig. 7 shows the device according to the invention in the rest position mounted on the trailer; fig. 8 shows the device according to the invention in the extended state mounted on the trailer; fig. 9 shows the trailer according to the invention with a loaded cable dmm in isometric view, in particular showing the rear and the right side of the trailer; fig. 10 shows the front view of the trailer according to the invention; fig. 11 shows the trailer according to the invention in the left side view; fig. 12 shows the preparation of a boom for loading a dmm onto the trailer according to the invention, incorporating the device according to the invention; fig. 13 shows the loading of the drum on the trailer according to the invention incorporating the device according to the invention; fig. 14 shows a drum loaded on a trailer according to the invention incorporating the device according to the invention; fig. 15 shows the construction of a locking-release mechanism in the device according to the invention.

Example 1. The device U according to the invention is a device provided with a steel main frame 1 for supporting and operating a cable dmm used for assembling fibre-optic infrastructure. The design of the U device according to the invention is shown in fig. 1-6, where 1 stands for the main frame, 2 stands for the sliding carriage, 3 stands for the triangular boom, 4 stands for the support bar, 5a and 5b stand for clamping yokes, 5c and 5d stand for threaded cranks, 6 stands for a winch with a drive, 7a stands for the first tensioning rollers, 7b stands for the second tensioning rollers, 7c stands for the third tensioning rollers, 8 stands for fixture of the sliding carriage, 9a and 9b stand for securing fixture of the triangular boom; 10a and 10b stand for a locking-release mechanism; 11a and lib stand for the tensioning of the sliding carriage, 12 stands for the support rollers of the sliding carriage, 22 stands for an additional reinforcing plate, 23 stands for an additional reinforcing beam.

As shown in fig. 1 in this non-limiting embodiment, the device U according to the invention is a separate module ready to be mounted in vehicles or trailers known from the prior art or in the trailer P according to the invention.

A sliding carriage 2 equipped with tensioning 11a and lib is mounted on the main frame 1, wherein said sliding carriage 2 is rectangular in shape, open on one side constituting the front part of the sliding carriage 2. Moreover, the main frame 1 is equipped with a locking-release mechanism 10a,10b mounted on both sides of the main frame 1 on its longitudinal sides. Whereas, the tensioning mechanism 11a and lib interacts/cooperates with the locking-release mechanism 10a and 10b mounted on the main frame 1.

In the centre of the front transverse part of the main frame 1 a winch 6 is mounted, connected to the drive. The sliding carriage 2 is equipped with a fixture 8 securing the sliding carriage 2 in the form of a bolt grip placed in a sleeve fixed in the main frame 1 and a sleeve in the sliding carriage 2.

The said securing fixture 8 of the sliding carriage ensures that the carriage 2 with a triangular boom 3 is secured against horizontal movement during transport.

Moreover, on the main fra e 1, through the carriage 2, a triangular boom 3 equipped with a securing fixture of the triangular boom in the form of brackets 9a and 9b, which protect it against vertical movement during the transport of the U device. Whereas in this non-limiting embodiment the sliding carriage 2 and the triangular boom 3 located on the main frame 1 are moved by means of an electrically powered drive of winch 6 via a steel cable and tensioning rollers 7a, 7b and 7c. However, within the meaning of the invention, other types of drives (e.g. mechanical, hydraulic, pneumatic) can also be used.

The device U according to the invention is powered by an external power source, which may be, for example, an accumulator of a vehicle towing a trailer on which the device is mounted. In this non-limiting embodiment, an independent installation is provided, powered from the vehicle accumulator (Cars) up to the auxiliary socket mounted on the hook of the towing vehicle. The trailer is connected by a plug to the socket of the vehicle towing the trailer. The installed system on the trailer supplies power to the winch 6 with the drive.

Whereas, in this embodiment, the drive is fixed to the centre of the front and transverse parts of the main frame 1 and is controlled by a wired remote control, while wireless remote controls can also be used. However, in the case of wired control, a contactor and the extend / retract buttons are used. In the case of wireless control, the control is carried out by means of a transmitter and a receiver, where the extend / retract command is given by radio waves.

In this embodiment, the two-button wired remote control has the following buttons: a) The extend / tilt button; b) The retract button.

As indicated in fig. 1 and 3, in the longitudinal part, the main frame 1 consists of two semi- closed channels parallel to each other, mounted with the open part of the channel facing upwards, and in the middle of each semi-closed channel of the longitudinal part of the main frame 1 there are support rollers 12 (Fig. 3) which, through an opening (or e.g. a cut) in the aforementioned semi-closed channel, were attached (with a distance allowing their movement) to a sliding carriage 2 mounted on the main frame 1. A suitable spacing between the first and second sets of support rollers 12 with respect to the sliding carriage 2 allows the sliding carriage 2 to slide in the main frame 1. This allows for a suitable extension beyond the front of the range of the main frame 1 (as shown in fig. 5 and 6) and provides additional freedom to position the Cable Drum X prior to loading.

As indicated in fig. 2, in this embodiment the device U is equipped with an additional reinforcing plate 22 and an additional reinforcing beam 23. The additional reinforcing plate 22 is intended to be mounted under the trailer floor, on which the U-device is mounted, and it fastens the main frame 1 and the winch 6 with the trailer support frame through. The additional reinforcing beam 23 is also intended to be mounted under the floor of the trailer on which the U device is mounted, and the said beam 23 fastens the main frame 1 with the trailer supporting frame through.

In the front, open part of the sliding carriage 2, a triangular boom 3 with tilting arms is mounted by means of bolts. As a result, the arms of the triangular boom 3 are able to tilt to load the Cable Drum X.

In the upper part of each of the tilting arms of the triangular boom 3, clamping yokes 5a, 5b are mounted, equipped with quadruple bearing sleeves and a support bar 4 fitted with two sliding plates and secured with threaded cranks 5c, 5d constituting the closing mechanism of the clamping yokes 5a, 5b.

The winch 6 is connected via a cable successively to the first tensioning roller 7a located in the rear part of the transverse main frame 1, the second tensioning roller 7b located in the rear part of the sliding carriage 2 and to the third tensioning roller 7c mounted on the triangular boom 3.

The device U according to the invention combines the following functions:

• Loading and unloading of cable / conduit / pipe / wire drum with a lifting device.

• Quick securing of the cable / conduit / pipe / wire drum during transport.

• Possibility to use the drum with cables / conduits / pipes / wires during line works without the need to unlock, unload the drum from a vehicle or trailer.

Example 2.

The service trailer P according to the invention is intended in particular for transporting materials on cable dmms and contains the device U according to the invention, which in an unloaded variant at rest is shown in Fig. 7. Whereas Fig. 8 the device U according to the invention is shown in a trailer P according to the invention during extension. Trailer P is equipped with a chassis frame mounted on a wheelset and with a floor plate, a front wall, two side walls and a ceiling plate. Moreover, in this embodiment, the trailer P is provided with a closure in the form of a rear double door, but another closure, e.g. a tailgate, may be used.

The device U according to the invention is located in the rear part. On the other hand, in the front part of the trailer P there is a frame 13 for mounting a compressor 14 and an air dryer 15 connected to it. Additionally, using the remaining space in the trailer P, a shelf for mounting accessories 16 was designed (for various types of accessories that may be useful during line work). In this non-limiting embodiment, the frame 13 ends at the top with a shelf for mounting accessories 16, for the safe storage of small accessories or additional devices.

In addition, the trailer P is provided with supports 18. Extending the trailer supports 8 is particularly recommended before loading and unloading the drum X. While using the trailer P, it is not required to extend the trailer supports 8.

As indicated in fig. 9, from the air dryer 15 a compressed air system 17 runs towards the rear of the trailer P and ends with a valve and a nipple. Whereby, said compressed air system 17 in the section from the air dryer 15 to the device U is extended along the inner surface of the right side of the trailer P. At the height of the device U, the system 17 turns vertically upwards towards the inner side of the ceiling plate of the trailer P, from where the compressed air system 17 is led up to the edge of the ceiling plate of the rear of the trailer P.

Moreover, in the right side wall of the trailer P, at the height of the frame 13 with the mounted compressor 14 and air dryer 15, there are side doors that allow free access to the compressor 14 and the air dryer 15 from the outside.

As indicated in fig. 10, in the front wall of the trailer P there is a warm air outlet 19 for cooling the compressor and a fuel filler 20 for refuelling the compressor. Whereas, as indicated in Fig. 11, in the left side wall of the trailer P, an air inlet 21 for the screw compressor 14 is installed.

The compressor 14 and the air dryer 15 are devices known from the prior art. When using the compressor 14 in the trailer P, check the fuel level in the compressor 14, and if necessary, refuel through the fuel filler neck for e.g. the compressor 20 located in the trailer P. The compressor 14 is started by a starter in accordance with the compressor 14 manufacturer's instructions and should remain started for the duration of the line work. By opening the valve located at the compressor 14, the compressed air system 17 is supplied, which is terminated with a valve and a connector to which an external blower is connected. Whereas, the said external blower machine is connected to the system 17 via an external, flexible, high-pressure hose. By opening the valve at the compressed air connection 17 the blower is ready for operation and can start working. Independent and free rotation of the loaded and secured cable drum X around its axis causes the cables / conduits / pipes / wires to unwind or wind. This allows immediate access and use when performing line work. After completing the work, it is enough to turn off the compressor 14 and close the valves, i.e. the first valve at the compressor 14 and the second at the compressed air system 17 terminated with a valve and a connector. Then, the external blower, connected with an external, flexible, high-pressure hose to the compressed air system coupling 17 is disconnected (i.e. detached). In the last stage, the rear door wings and the side door of the trailer P are closed, thus securing everything for transport.

The service trailer P according to the invention enables the integration of many service devices, which, when integrated in a closed trailer, form a compact, mobile and specialised set for line work, e.g. for assembly, installation, laying, unfolding, inserting, blowing, pulling all kinds of cables, conduits, pipes, wires, etc.

At the same time, in the trailer P, all devices, including the device U according to the invention, are installed in the working sequence, so there is no need to remove the devices in order to prepare them for the commencement of work. This way, the team is operational within minutes of arriving at the job site. By skipping unpacking / packing of the equipment necessary for work, the efficiency of the team significantly increases, especially when it carries out line work in many locations in one day.

The designed bodywork enables adaptation of the trailer P according to the invention to a wide range of applications, enables quick access to individual devices and their efficient service.

Example 3,

The mechanism of operation of the device U according to the invention mounted on a trailer

Stage 1: preparing the device U for loading (or unloading) of Drum X

The device U according to the invention, when loaded on the trailer P according to the invention, in the starting condition (i.e. free from loading) is blocked for transport and secured against vertical movement (by means of the triangular boom securing fixtures 9a and 9b) and horizontal movement (by means of the securing fixture 8 of the sliding carriage). Before starting the operation of the U device, release the securing fixture 8 of the sliding carriage by pulling the bolt grip from the sleeve fixed in the main frame 1 and in the sliding carriage 2. The securing fixture 8 is manually released by the Operator.

On the other hand, the securing fixtures of the triangular boom 9a and 9b are automatically released. After releasing the securing fixture 8 (used for transport), it is possible to extend the sliding carriage 2 and the triangular boom 3 in the device U according to the invention. In this embodiment, the travel of the sliding carriage 2 is controlled by a wired remote control.

The travel of the sliding carriage 2 in the main frame 1 enables the appropriate spacing of sets of supporting rollers 12 in the main frame 1 in relation to the sliding carriage 2. The pinning of the triangular boom 3 mounted in the front open part of the sliding carriage 2 by means of bolts allows the arms of the triangular boom 3 to tilt out for loading the drum X.

When the sliding carriage 2 is extended together with the triangular boom 3, the motorized winch 6 loosens the steel cable and the steel cable through the first, second and third tensioning rollers 7a, 7b and 7c successively, thanks to the tensioning features of the sliding carriage 11a and lib (in the form of springs that begin to pull), cause the sliding carriage 2 to slide out together with the triangular boom 3, until the point of contact with the locking- release mechanism 10a and 10b is reached.

The locking-release mechanism 10a and 10b, when the sliding carriage 2 extends, first locks the sliding carriage 2 and enables the tilting out the triangular boom 3. Note: in the first phase, the operator manually tilts the triangular boom 3 while loosening the steel cable from the winch 6, but only until the triangular boom 3 tilts (i.e. approx. 20 cm) so that the triangular boom 3 can continue to tilt automatically / automatically (gravity) .

The locking-release mechanism 10a and 10b during the retraction procedure of the sliding carriage 2, until the triangular boom 3 returns (i.e. it returns to its initial position in the carriage 2) automatically locks the sliding carriage 2. This allows free return movement of the triangular boom 3. As soon as the triangular boom 3 comes into contact with the sliding carriage 2, the locking device is automatically released (by means of special pawls), allowing the sliding back into the return position by the sliding carriage 2, The locking-release mechanism 10a, 10b is shown in Fig. 15, wherein 24 is the triangular locking element, 25 is the pin and 26 is the release part.

In this non-limiting embodiment, the locking-release mechanism 10a, 10b applied consists of: A) two triangular parts (i.e., locking elements 24);

B) two ratchet slides which are the release parts 26 with a fixed pin 25 (or, e.g., a rounded pin);

C) two springs pushing out the slide;

D) two guides for ratchet slides.

Two triangular parts A were symmetrically mounted on the main frame 1, and they were mounted in such a way that the upper part of the triangles A protrudes above the upper part of the main frame 1, fulfilling the function of a lock of the rear transverse structure of the sliding carriage 2 (so the sliding carriage 2 moves only between the starting position and the lock of the triangles described above A).

Two guides for the ratchet slides D have been symmetrically mounted to the main Frame 1, so that the ratchet slides B could freely move up and down through the oncoming and exiting sliding carriage 2. The guides D also fulfil the function of limiting the movement of the moving slides B to the necessary extent, and in particular limiting their upper position.

In order for the ratchet slides B to automatically return / position themselves in the upper part of the guides, springs were mounted symmetrically on the main frame 1, pushing out the C slides, but allowing the pushing (downward movement) of the ratchet slides B through the oncoming sliding carriage 2.

Two ratchet slides B have been symmetrically mounted to the main frame 1, so that they can move freely up and down, the ejection spring C provides upward movement, and the rear transverse part of the sliding carriage 2, by riding onto the ratchet slides, provides the downward movement.

An important element are the pins 25 (or e.g. rounded mandrels) which, through the penetrations / holes (with a diameter greater than the pins / mandrels) on the edges of the rear - transverse - lower part of the sliding carriage 2 structure, enter the penetration / hole in the initial phase of tilting of the triangular boom3, locking at the same time the return movement of the sliding carriage 2.

Thus, in the swing phase of the triangular Boom 3, both the two triangular parts A and the pins 25 / rounded mandrels of the ratchet slides B prevent the sliding carriage 2 from moving forward and backward, thus blocking the sliding carriage 2. Only in the return phase of the triangular boom 3, i.e. until it is laid in the sliding carriage 2, while simultaneously pressing the pins 25 / mandrels of the ratchet slides B, it is possible to move backwards and return the sliding carriage 2 to its starting point.

The ratchet slides B are pushed up again waiting for the sliding carriage 2

After the sliding carriage 2 has stopped at the point of contact with the locking-and-release mechanism 10a and 10b (i.e. when the maximum extension point has been reached), it is the moment of locking the carriage. Next, the triangular boom 3 is unlocked, which, by further loosening the cable from the winch 6 with the drive, allows the arms of the triangular boom 3 to tilt until the necessary height in the axis of the drum X is reached, as shown in Fig. 12.

After the arms of the triangular boom 3 have tilted to the point specified by the operator (e.g. the height of the drum axis), the operator manually releases the clamping yokes 5a and 5b by unscrewing the threaded cranks 5c and 5d, respectively. The operator then opens the clamping yokes 5a and 5b, which allows the support bar 4 to be pulled out. When the support bar 4 is pulled out, an open space is reached between the arms of the triangular boom 3, which allows the drum X to be rolled in or the trailer according to the invention to be set up/moved/parked with the device U according to the invention in such a way that the axis of the drum X is in the closing axis of the clamping yokes 5a and 5b.

Stage 2: Fixing and securing the dmm X in the device U according to the invention In the axis of the dmm X there are holes on both its left and right sides (through holes), into the holes in the axis of the drum X the operator places the support bar 4, so that the ends of the support bar 4 are in place of the bearing sleeves located on both sides in the clamping yokes 5a and 5b. After the support bar 4 has been returned to the clamping yokes 5a and 5b, the clamping yokes 5a and 5b are closed and secured with threaded cranks 5c and 5d. Additionally, on the support bar 4 there are two disks moved to the left and right sides of the dmm X, which, after its centring, are attached to the support bar 4, and protect the drum X from shifting during loading, i.e. retracting by the device U according to the invention, and during transport. This loading step is shown schematically in Fig. 13.

Stage 3: Pulling in the triangular boom 3 and inserting the sliding carriage 2 in the trailer interior

After placing and securing the drum X on the support bar 4 and placing the support bar 4 in the clamping yokes 5a and 5b, the arms of the triangular boom 3 are pulled in together with the drum X placed on the support bar 4, the winch 6 with a drive pulls the steel cable in and through the tensioning rollers 7a , 7b and 7c, the triangular boom 3 is pulled in until the triangular boom 3 is laid and rests in the sliding carriage 2, which stands locked in its original point of contact with the locking-release mechanism 10a and 10b.

After the triangular boom 3 is laid and rested in the sliding carriage 2 at the point of contact with the locking-release mechanism 10a and 10b (i.e. after folding and fully resting, the carriage 2 is unlocked). The triangular boom 3 is blocked successively, while the sliding carriage 2 is unlocked at the same time. By continuing to pull in the line through the motorized winch 6, the sliding carriage 2 is retracted while tensioning the tensions of the sliding carriage 11a and lib (the springs begin to stretch) until the sliding carriage 2 reaches the return starting point.

Stage 4: Completion of work and securing of the device U according to the invention:

The sliding carriage 2 with the triangular boom 3 reaching the starting point are automatically locked again and secured against vertical movement during transport by means of securing fixtures of the triangular boom 9a and 9b. Additionally, the sliding carriage 2 together with the triangular boom 3 is secured against horizontal movement during transport by means of the securing fixture of the sliding carriage 8. Thus, the device U according to the invention reaches the occupied start condition with loading.

The device U with the dmm X is secured and ready for transport and at the same time ready for line work (fig. 14).

Whereas, the trailer according to the invention containing the device U according to the invention with a loaded cable drum X is ready for use and does not require any additional operations to be performed before line work is started.

This is due to the innovative fastening system, including the use of clamping yokes 5a and 5b, which are equipped with quadruple bearing sleeves in each of the arms of the triangular boom 3, which enables direct, independent and free rotation of the placed support bar 4, and as a result, allows the cable drum X to rotate around its axis (causing cables / conduits / pipes / wires to unwind or wind).

Whereas, when loading / unloading the cable drum X, it must be noted that the trailer P should always be connected to an additional independent power supply, e.g. directly to the battery of the vehicle towing the trailer. It is recommended that the vehicle always have the engine running when loading and unloading the drum X.

However, the said connection to an independent power supply and the engine running in the vehicle is required only for the time of loading and unloading the drum X. During the use of the trailer P, power is not required.

The rear door wings and the side doors of trailer P must always be open and secured during loading, use and unloading of drum X.

The above-mentioned embodiments and drawings are only examples of embodiments of the device U and the trailer P according to the invention, and do not limit the invention. The embodiments of the invention presented in the exemplary embodiments constitute an illustrative basic model of the device U and the trailer P equipped with wire control, but an integral feature of the invention is the possibility of retrofitting them, e.g. with the following functions, such as:

• full automation;

• introduction of wireless control;

• changeable or cooperating power sources and types of drives (electric, hydraulic or pneumatic);

However, the above changes do not require the reconstruction or redesign of the U device, but only the installation of additional parts.