The subject of the invention is a cable drum established from one or more materials without arc welding, which solution allows the simple and easy assembling and fixing of components of the cable drum made from various materials, and it is possible to omit the use of seams of arc welding at the connections of the metal parts of the cable drum.

At the cable manufacturing companies the cables released by the production lines are wound up on cable drums, and the cables are delivered to the customers on these cable drums. The external plastic sheath of the cables coming from the production lines is sensitive to damage, and can be damaged by welds on the surface of the winding space of metal cable drum; if the welds are not smoothed sufficiently by grinding. For this reason, the cable manufacturers prefer the use of less expensive wooden cable drums. However, the operating life of the wooden cable drums is short, and its regular production is a substantial load on the environment.

According to the state of art the patent No. P9202003 makes known a cable drum, which is provided with drum hub and drum disks, where at least one of the two drum disks has a cable transfer hole in the area of the drum hub for passing through the end of the cable to be wound up, and there is a cable holding device situated at the outside in radial direction from the cable transfer hole, which is suitable for fixing the cable end. In addition to that, at least one of the two drum disks is provided with fixing holes in its rim region allocated along its perimeter.

The patent description having document No. P 99 02008 and registration No. 222 932 makes known a self-winding cable drum mounted on embedding trunnion on a base plate. The essential idea of the solution is that a ring-shaped stump of the cable drum is inserted into the U shaped groove of the base plate, which is formed by a second mantle wall, a second ring-shaped disk wall and a third mantle wall, while a chamber of the base plate is connected to an opening of the third mantle wall, and it receives a winding spring, which is fixed to the ring-shaped stump, and in addition to that, the third mantle wall has a further opening, through which a braking roller is passed and it is seated on the internal surface of the ring-shaped stump, while the central ring-shaped wall of the base plate receives contact rings, and it carries the embedding trunnion, and at the same time, a further ring-shaped wall of the cable dram carries sliding contactors.

The cable drum varieties introduced above and used in practice do not allow a simple assembling of cable drum components, and do not allow the fixing of metal parts without arc welding.

While creating the cable drum according to the invention we had the aim to establish a cable drum, which allows an easy assembling of components made of dissimilar materials in a given case, and also makes possible to omit the arc welding when fixing the metal components.

During the creation of the cable drum according to the invention we recognised, that if in the two side walls with diameter D which are provided with radial grooves and have a rim around their external perimeter and with bushing at their internal perimeter with diameter Dl we fix the connecting lugs located in radial direction of the connecting ring fixed to the internal surface at both ends of the cylindrical core element into the nests of the grooves of the side walls, and a cylindrical spacer tube is fixed to the internal surfaces of the side wall bushings, then the set out aim can be reached. The invention is a cable drum created from one or more materials without arc welding, which consists of side walls that contain bushings, winding space bordered by core element, and a spacer tube located within the core element. It is characterised by that the cable drum has two rims having diameter "d" with radially aligned grooves having width V, which are formed in a torus shape or out of a torus shape along its external perimeter, and it has a bushing containing the grooves in a shape locking manner having height H along the perimeter with diameter Dl, where the connecting lugs of the radially aligned connecting rings that are attached to the internal surface of both ends of the cylindrical core element in the side walls having ring shape with diameter D, are fixed with their upper parts having height "m" into the nests having height H2 at this point of the grooves where H2 > m, and in this way the side walls and the core element create the winding space, while the cylindrical spacer tube is fixed in a shape locking manner to the internal surfaces of bushings of the side walls.

In a preferred embodiment of the solution according to the invention the ring-shaped side wall of the cable drum is formed from rectangular base plate in a manner that the groove having a width V and a length close to the shorter edge of the base plate , have a height H along one of the longitudinal sides of the rectangle, which form the part with inner diameter Dl of side wall, and the other ends of the grooves reach the height 0 at a distance l.ld - 5d from the other longitudinal edge of the rectangle, and the two ends of the side wall are fixed together in a known manner along the fitting line, while the height of groove is Hl at the meeting line of the torus shaped rim formed at the outside perimeter of side wall and the groove, where 0 < HI < d.

In another preferred embodiment of the solution according to the invention the inner space of torus shaped side wall or the rim formed from a torus shape is filled with rubber bands, cords or elastic material. 4

In a further preferred embodiment of the solution according to the invention the connecting ring is formed from a rectangular base plate having width K up to width K1 in the base plate, where Kl < K, with inclination angle b, where b < 90°, while the connecting lugs formed with cutting lines , are folded down perpendicularly to the plane of the base plate along the folding lines, and the two ends of the base plate are fixed together in a known manner along the fitting line, in this way the connecting lugs are oriented in radial direction in case of circular connecting ring.

In a further preferred embodiment of the solution according to the invention the connecting lugs of the connecting ring are folded in with an inclination angle a along the folding lines, which are parallel with the lengthwise direction of its rectangular base plate, where a < 90°.

In a further preferred embodiment of the solution according to the invention the cross section of the rim is a semi-circle or circle with diameter“d”, or a circle segment with diameter“d”, which is bordered by X long chord, which is perpendicular to the base plate, or a circle segment with diameter“d”, which is bordered by“X” long chord perpendicular to the base plate as well as by the“Y” wide chord parallel with the base plate, or a circle segment with diameter“d”, which is bordered by“X” long chord parallel with the base plate as well as by the“Y” wide chord parallel with the base plate, while a rectangular void size„s” x„z” is formed in it.

In a further preferred embodiment of the solution according to the invention the groove is established with various geometrical shapes, which are suitable for receiving the upper part of connecting lug having a height "m", and its width V can in a given case be 0 that is V=0.

In a further preferred embodiment of the solution according to the invention the shape of fixing bushing containing the grooves having height H at the internal part of the side wall is U profile, or semi arched U profile or arched U profile, or arched ring U profile. 5

In a further preferred embodiment of the solution according to the invention the fixing together of connecting ring and the core element can be made with solid joints, or with shape locking snap-in joint, or snap-in joint created by simultaneous deformation or by adhering.

In a further preferred embodiment of the solution according to the invention the number of connecting lugs of the connecting ring is equal to the number of grooves formed in the side wall, and their distance corresponds to the spacing of grooves.

In a further preferred embodiment of the solution according to the invention the material of side wall, core element, bushing, spacer tube and connecting ring of the cable drum is metal and/or plastic and/or paper and/or ductile material.

In a further preferred embodiment of the solution according to the invention the components of the cable drum, the side wall, the core element, the bushing, the spacer tube and the connecting ring are fixed together with adhering and/or by means of spot welding.

The solution according to the invention is furthermore set forth by the enclosed drawings:

Fig. 1 shows the cross-sectional view with cutaway of the cable drum 1 according to the invention.

Fig. 2 shows the lateral view of the cable drum according to the invention.

Fig. 3 shows the side wall of the cable drum in axonometric view.

Fig. 4 shows a possible embodiment of the cross section of groove of the side wall.

Fig. 5 shows a further possible embodiment of the cross section of the groove of the side wall.

Fig. 6 shows a further possible embodiment of the cross section of the groove of the side wall. Fig. 7 shows a further possible embodiment of the cross section of the groove of the side wall.

Fig. 8 shows a further possible embodiment of the cross section of the groove of the side wall.

Fig. 9 shows a further possible embodiment of the cross section of the groove of the side wall.

Fig. 10 shows the enlarged view of detail“A” introduced in Fig. 1 with a possible embodiment of the rim of the side wall.

Fig. 11 shows the enlarged view of detail“A” introduced in Fig. 1 with a further possible embodiment of the rim of the side wall.

Fig. 12 shows the enlarged view of detail“A” introduced in Fig. 1 with a further possible embodiment of the rim of the side wall.

Fig. 13 shows the enlarged view of detail“A” introduced in Fig, 1, together with a further possible embodiment of rim of the side wall.

Fig. 14 shows the enlarged view of detail“A” introduced in Fig. 1 with a further possible embodiment of the rim of the side wall.

Fig. 15 shows the enlarged view of detail“A” introduced in Fig. 1 with a further possible embodiment of the rim of the side wall.

Fig. 16 and Fig. 17 show a possible embodiment of the geometrical configuration of rim introduced in section G-G of Fig. 3.

Fig. 18 and Fig. 19 show an additional possible embodiment of the geometrical configuration of the rim introduced in section G-G in Fig. 3.

Fig. 20 and Fig. 21 show a further possible embodiment of the geometrical configuration of the rim introduced in section G-G in Fig. 3.

Fig. 22 shows a possible embodiment of the base plate of the connecting ring.

Fig. 23 shows the top view of base plate of the connecting ring introduced in Fig. 22, together with the folded down lugs.

Fig. 24 shows the view F-F of the connecting ring introduced in Fig. 23.

Fig. 25 shows the connecting ring introduced in Fig. 22 in assembled state.

Fig. 26 shows a further possible embodiment of the base plate of the connecting ring. Fig. 27 shows the top view of the base plate of the connecting ring introduced in Fig. 26 with the folded down lugs.

Fig. 28 shows the view G-G of the connecting ring introduced in Fig. 27.

Fig. 29 shows the connecting ring introduced in Fig. 26, in assembled state.

Fig. 30 shows the enlarged view of detail "C" introduced in Fig. 1 in case of a possible embodiment of the groove and the bushing and their connection.

Fig. 31 shows the enlarged view of detail "C" introduced in Fig. 1 in case of another possible embodiment of the groove and the bushing and its connection.

Fig. 32 shows the enlarged view of detail "C" introduced in Fig. 1 in case of another possible embodiment of bushing and its connection.

Fig. 33 shows the enlarged view of detail "C" introduced in Fig. 1 in case of another possible embodiment of bushing and its connection.

Fig. 34 shows a possible embodiment of the connection among the bushing, the side wall formed with groove and the spacer tube.

Fig. 35 shows another possible embodiment of the connection among the bushing, the side wall formed with groove and the spacer tube.

Fig. 36 shows another possible embodiment of the connection among the bushing, the side wall formed with groove and the spacer tube.

Fig. 37 shows the enlarged view of detail "B" introduced in Fig 1.

Fig. 38 shows the view J-J introduced in Fig. 37.

Fig. 39 shows a possible embodiment of the fixing of connecting lug and groove introduced in Fig. 38.

Fig. 40 shows a possible embodiment of the fixing of connecting lug and groove introduced in Fig. 38.

Fig. 41 shows a possible embodiment of section E-E introduced in Fig. 2.

Fig. 42 and 43 show the possible fitting and fixing together of the side wall and the ends of core element. Fig. 1 shows the cross-sectional view with cutaway of the cable drum 1 according to the invention. The figure shows the two side walls 2 of the cable drum 1, which are formed with diameter D from the base plate 22 having groves 7, including a rim 8 formed at the outside part of the side walls 2. The nests 24 of the grooves 7 can be seen in the figure, and it can be seen, that the nests 24 of the grooves 7 are aligned in the direction of the winding space 6 with increasing width.

There are bushings 4 formed at the internal end towards the diameter Dl of the groves 7 of the side walls 2, and the spacer tube 5 is placed in the bushings 4 in a shape locking manner.

The connecting ring 9 provided with connecting lugs 10 can also be seen, where the connecting lugs 10 are fixed in the grooves 7 of the side walls 2. The core element 3 is fixed to the connecting ring 9 also in a shape locking manner. As can be seen well in the figure, the connecting ring 9 is fixed in geometrical terms by inserting the connecting lugs 10 to the appropriate extent into the grooves 7 having the given shape.

Eventually the function of the connecting ring 9 can be taken over by the properly formed core element 3 if the lugs 10 are formed at the appropriate end or at both ends of the core element 3.

As can be seen in the figure the groves 7 are formed in a way, that the grooves 7 have a height H at the bushing 4 on the internal part of the side wall 2, while the grooves 7 have a height Hl at the rim 8 of the side wall 2. Hl is less than the diameter d of the rim 8, i.e. 0 < Hl < d.

The height Hl may be 0, in that case the groove 7 touches the base plate 22. If the value of Hl is greater than 0, then the part of rim 8 and the groove 7 mutually deform each other as they are forced into each other. The compression into each other is allowed as long as the geometry of the winding space is not disturbed. Fig. 2 shows the lateral view of the cable drum 1 according to the invention. The side wall 2 of the cable drum 1 can be seen here, which is formed from the base plate 22 with grooves 7 and has a diameter D, and a rim 8 is formed at diameter D of the side wall 2. The side wall 2 is fixed in a known manner at the fitting 20 line.

A bushing 4 is located at the internal diameter D 1 of the base plate 22 at the grooves 7 of the side wall 2, and a spacer tube 5 is placed in a shape locking manner in the bushing 4. The core element 3 can be seen here, which is indicated with dashed line.

Fig. 3 shows the side wall of the cable drum 1 in axonometric view. The side wall 2 of the cable drum 1 is formed from base plate 22 and it has a ring shape, it includes the grooves 7 aligned in radial direction which contain the nest 24 having a width V and it has a rim 8. The grooves 7 are formed in a way, that the grooves 7 have a height H at the end towards the internal diameter Dl of the base plate 22. At the same time, the grooves 7 have a height HI at the rim 8 of the side wall 2, where 0 < HI < d.

The side wall 2 is formed from rectangular base plate 22. In this case the grooves 7 having length close to the shorter edge of the base plate 22 are formed in a way, that they have a height H at one of the longitudinal edge of the rectangle, which form the part of side wall 2 having a diameter D 1. The opposite ends of the grooves 7 reach the height 0 at a distance of l .ld - 5d from other longitudinal edge of the rectangle.

In this way the side wall 2 is created with diameter D, the two ends of which are fixed together in a known manner along the fitting line 20.

The height H is determined in a known manner on the basis of the number of grooves 7 and their width V. Fig. 4 shows a possible embodiment of the cross section of groove 7 of the side wall 2. The cross-sectional view of groove 7 can be seen here, which includes the nest 24, and is formed in the base plate 22 with width V and height H, where V > FI in this case. The grove 7 is rectangular in this case.

Fig. 5 shows a further possible embodiment of the cross section of the groove 7 of the side wall 2. The groove 7 can be seen in the figure, formed in the base plate 22 with width V and height H, which in this case has V = 0. Nest 24 exists in this case too, but the elements are created by the simultaneous forming of the nest 24 and the connecting lug 10.

Fig. 6 shows a further possible embodiment of the cross section of the groove 7 of the side wall 2. The groove 7 containing the nest 24 and having a height H can be seen in the figure as formed in the base plate 22.

In this case the groove 7 is formed in a way that the width V of the groove 7 is 0 at the part closer to the base plate 22, i.e. V = 0. Then the shape of the groove 7 is a convex curve at every point, in a given case it is a circle.

Fig. 7 shows a further possible embodiment of the cross section of the groove 7 of the side wall 2. The groove 7 can be seen in the figure, which is formed in the base plate 22 with a height H and it contains the nest 24.

In this case the groove 7 is formed in a way that the leading width V is widened towards the winding space 6 to width VI, i.e. VI > V.

Fig. 8 shows a further possible embodiment of the cross section of the groove 7 of the side wall 2. The groove 7 formed in the base plate 22 is shown here with a height H. In this case the groove 7 is formed in a way that the lower part of groove 7 is perpendicular to the base plate 22. The width V of the groove 7 is 0, i.e. V = 0.

At height H the groove 7 is parallel with the base plate 22, and has a width V2, and is terminated also in a compressed flat shape.

Fig. 9 shows a further possible embodiment of the cross section of the groove 7 of the side wall 2. The groove 7 can be seen in the figure, which is formed in the base plate 22 with a height H and it contains the nest 24.

In this case the groove 7 is formed in a way that the lower part of groove 7 is perpendicular to the base plate 22 with width V. In this case the groove 7 is parallel with the base plate 22 at height H, and has a width V3, and is terminated in a compressed flat shape.

Fig. 10 shows the enlarged view of detail“A” introduced in Fig. 1 with a possible embodiment of the rim 8 of the side wall 2. The figure shows the base plate 22 of the side wall 2 with the groove 7.

It can be seen in the figure that in this case the rim 8 having diameter“d” is formed in a semi-circular shape so that it is folded up from the edge of the base plate 22.

Fig. 11 shows the enlarged view of detail“A” introduced in Fig. 1 with a further possible embodiment of the rim 8 of the side wall 2. The figure shows the base plate 22 of the side wall 2 with the groove 7. It can be seen in the figure that in this case the rim 8 having a diameter“d” is formed in a circular shape fitted to the surface of groove 7 so that it is folded up from the edge of the base plate 22.

In this case the rim 8 runs along the entire external edge of the side wall 2 having a diameter D in a nearly toroidal shape. Fig. 12 shows the enlarged view of detail“A” introduced in Fig. 1 with a further possible embodiment of the rim 8 of the side wall 2. The figure shows the base plate 22 of the side wall 2 with the groove 7.

It can be seen in the figure that in this case the rim 8 having a diameter“d” is formed in full circular shape so that it is folded up from the edge of the base plate 22. In this case the rim 8 runs in the form of a torus along the entire external edge of the side wall 2 having diameter D.

Fig. 13 shows the enlarged view of detail“A” introduced in Fig, 1, together with a further possible embodiment of rim 8 of the side wall 2. The figure shows the base plate 22 of the side wall 2 with the groove 7.

It can be seen in the figure that in this case the rim 8 has a circular segment cross section, which is folded up from the edge of the base plate 22. In this case the cross section of the rim 8 is a circular segment with diameter d, which is bordered by a chord with length X perpendicular to the base plate 22. The rim 8 runs along then entire external edge of the side wall 3 having diameter D in a shape of truncated torus.

Fig. 14 shows the enlarged view of detail“A” introduced in Fig. 1 with a further possible embodiment of the rim 8 of the side wall 2. The figure shows the base plate 22 of the side wall 2 with the formed groove 7.

It can be seen in the figure that in this case the rim 8 has a circular segment cross section, which is folded up from the edge of the base plate 22. In this case the cross section of rim 8 is a circular segment with diameter d, which is bordered by a chord with length“x” perpendicular to the base plate 22, as well as by a chord with width“y” parallel with the base plate 22. The rim 8 runs along the entire external edge of the side wall 2 having diameter D in a double truncated torus shape.

Fig. 15 shows the enlarged view of detail“A” introduced in Fig. 1 with a further possible embodiment of the rim 8 of the side wall 2. The figure shows the base plate 22 of the side wall 2 with the groove 7. It can be seen in the figure that in this case the rim 8 is formed from a shape having circular segment cross section according to Fig. 14, in which an„s” x„z” rectangular hollow part is formed from below.

In this case the cross section of rim 8 is a circular segment with diameter d, which is bordered by a chord with length“x” perpendicular to the base plate 22, as well as by a chord with width“y” parallel with the base plate 22, and an„s” x„z” rectangular hollow part is formed in it.

In case of rim 8 shown in Figs. 11-15 the internal space of the rim 8 is filled with rubber bands, cords or other materials considered elastic relative to the material of the side wall, in order to improve the rigidity and stability of the rim 8. With this solution an internal counter pressure is created in the rim 8 in order that it could balance the pressure when the cable drum 1 is rolled while the rim 8 of the side wall 2 having diameter D touches the ground. It is ensured by this solution that the rim 8 retains its torus or truncated torus shape without collapsing or breaking.

Fig. 16 and Fig. 17 show a possible embodiment of the geometrical configuration of rim 8 introduced in section G-G of Fig. 3. The base plate 22 and the longitudinal section of the groove 7 can be seen in Fig. 16 before the rim 8 with diameter d is created. It can be seen well in the figure that the grove 7 in this case reaches the height 0 at a distance Ll from the external edge of the base plate 22, where Ll= 1. ld - 1 6d, and it has a height H at the internal edge of the base plate 22. Fig. 17 shows the base plate 22 introduced in Fig. 16 together with the rim 8 having diameter d created by means of the geometrical arrangement of groove 7.

The figure shows diameter D of side wall 2, as well as the distance L2 between the external edge of base plate 22 and the external edge of rim 8, where L2 = 2.5d - 3.5d. Also, the distance L3 is shown in the vertical projection between the extreme edge of the base plate 22 and the centre of the rim 8 having diameter d, which L3= 3d-4d. The height Hl of the groove 7 can be seen in Fig. 17 at the meeting of groove 7 and rim 8. It can be seen in the figures that the length of the material necessary for establishing the given rim 8 has to be considered also when selecting the width of the base plate 22, so that in the final configuration of side wall 2 has a diameter D.

Fig. 18 and Fig. 19 show an additional possible embodiment of the geometrical configuration of the rim 8 introduced in section G-G in Fig. 3. Fig. 18 shows the longitudinal section of base plate 22 and groove 7 before establishing the rim 8 with diameter d. In this case the groove 7 reaches the height 0 at a distance L3 in front of the external edge of base plate, where L3 = 3d - 4d. At the same time, the grove 7 has a height H at the internal edge of the base plate 22.

Fig. 19 shows the base plate 22 introduced in Fig. 18, together with the rim 8 with diameter d as formed by the geometrical arrangement of the groove 7.

The diameter D of side wall 2 is shown in the figure together with distance L2 between the external edge of base plate 22 and the external edge of rim 8, where L3= 3d-4d. The vertical projection of distance L3 between the external edge of base plate 22 and the centre of rim 8 having diameter d is also shown, where L3 = 3d - 4d.

It can be seen in Fig. 19 that in this case at the meeting of the groove 7 and the rim 8 the height Hl of groove 7 is 0.

It can be seen in the figures, that the length of the material necessary for establishing the given rim 8 has to be considered also when selecting the width of the base plate 22, so that in the final configuration of side wall 2 has a diameter D.

Fig. 20 and Fig. 21 show a further possible embodiment of the geometrical configuration of the rim 8 introduced in section G-G in Fig. 3. Fig. 20 shows the longitudinal section of base plate 22 and groove 7 before establishing the rim 8 with diameter d. It can be well seen in the figure that the groove 7 reaches the height 0 at a distance L4 from the external edge of base plate 22, where 5d > L4 > 3.5d, and it has a height H at the internal edge of base plate 22.

Fig. 21 shows the base plate 22 introduced in Fig. 20, together with the rim 8 with diameter d as formed by the geometrical arrangement of the groove 7.

The diameter D of the side wall 2 is shown in the figures together with distance L2 between the external edge of base plate 22 and the external edge of rim 8, where L2 = 2.5d - 3.5d. The vertical projection of distance L3 between the external edge of base plate 22 and the centre of rim 8 having a diameter d is also shown, which is L3 = 3d - 4d.

It can be seen well in Fig. 21 that the height Hl of groove 7 is 0 in this case at the meeting of the groove 7 and the rim 8.

It can be seen in the figures, that in this case the length of the material necessary for establishing the given rim 8 has to be considered also when selecting the width of the base plate 22, so that in the final configuration of side wall 2 has a diameter D.

Fig. 22 shows a possible embodiment of the base plate 19 of the connecting ring 9. The base plate 19 of the connecting ring 9 is shown in the figure, which has a nearly rectangular shape and a width K.

The connecting lugs 10 are formed in the base plate 19 with an inclination angle b with the help of the cutting lines 11 , where b < 90°. It can be seen in the figure that the cutting lines 11 are cut to a width Kl in the base plate, where Kl< K.

The figure also shows the folding lines 12 with dashed lines on the connecting lug 10.

Fig. 23 shows the top view of base plate 19 of the connecting ring 9 introduced in Fig. 22, together with the folded down lugs 10. The base plate 19 of the connecting ring 9 can be seen in the figure together with the folded lugs 10 next to the folding lines 12. As a result of this, the connecting lugs 10 are formed at a distance S relative to one another. In case of the connecting ring 9 the distance S is determined according to the distance between the grooves 7, and the number of connecting lugs 10 is determined according to the number of grooves 7 established in the side wall 2.

The connecting lugs 10 are first folded down on the flat base plate 19 in parallel relative to one another. However, after fixing the two ends of the base plate 19 together, when the connecting ring 9 is created, the connecting lugs 10 are already aligned in radial direction.

In this case the radially oriented connecting lugs 10 fit to the grooves 7, because the grooves formed in the side wall 2 are aligned in radial direction. A section of connecting lug 10 folded down from the plane of the base plate 19 is shown with height "m", which is fixed in the groove 7. The height "m" is to be determined in relation to the height of the given section of the groove 7.

Fig. 24 shows the view F-F of the connecting ring 9 introduced in Fig. 23. The base plate 19 of the connecting ring 9 can be seen in the figure together with the connecting lug 10. The height“m” of connecting lug 10 is also shown, which is fixed into the groove 7.

Fig. 25 shows the connecting ring 9 introduced in Fig. 22 in assembled state. The base plate 19 of the connecting ring 9 can be seen in the figure, which is fixed in known manner along the fitting line 21, together with the folding lines 12 and the connecting lugs 10.

Fig. 26 shows a further possible embodiment of the base plate 19 of the connecting ring 9. The figure shows the base plate 19 of the connecting ring 9 which has a nearly rectangular shape and a width K. The connecting lugs 10 are established with the help of cutting lines 11 with an inclination angle b in the base plate 19, where b < 90°. Furthermore, the folding lines 12, 13 are established on the connecting lugs 10.

It can be seen in the figure that the cutting lines 11 are cut into the base plate 19 with a width Kl < K. Fig. 27 shows the top view of the base plate 19 of the connecting ring 9 introduced in Fig. 26 with the folded down lugs 10. The base plate 19 of the connecting ring 9 can be seen in the figure, together with the connecting lugs 10 folded down along the folding lines 12, as well as the folds 14 folded down along the folding lines 13. In this way the connecting lugs 10 are formed at a distance S relative to one another.

The connecting lugs 10 are folded down in parallel with one another on the flattened base plate 19. However, the connecting lugs 10 are aligned already in radial direction after fixing the two ends of the base plate together, when the connecting ring 9 is created.

In this case the connecting lugs 10 aligned in radial direction fit to the grooves 7, because the grooves 7 formed in the side wall 2 are oriented in radial direction. A section of connecting lug 10 folded down from the plane of the base plate 19 is shown with height "m", which is fixed in the groove 7. The height "m" is to be determined in relation to the height of the given section of the groove 7.

Fig. 28 shows the view G-G of the connecting ring 9 introduced in Fig. 27. The base plate 19 of the connecting ring 9 can be seen in the figure together with the formed connecting lug 10 and the fold 14.

The height "m" of the connecting lug 10 is also shown, which is fixed into the groove 7.

Fig. 29 shows the connecting ring 9 introduced in Fig. 26, in assembled state. The base plate 19 of the connecting ring 9 can be seen in the figure, which is fixed in a known manner along the connecting line 21, together with the folding lines 12, connecting lugs 10 and the folds 14.

The angle formed by the connecting lug 10 and the fold 14 is marked with inclination angle a in the figure, which is a < 90°. Fig. 30 shows the enlarged view of detail "C" introduced in Fig. 1 in case of a possible embodiment of the groove 7 and the bushing 4 and their connection. The groove 7 established in the base plate 22 can be seen in the figure together with bushing 4 that has and U profile 15.

Fig. 31 shows the enlarged view of detail "C" introduced in Fig. 1 in case of another possible embodiment of the groove 7 and the bushing 4 and its connection. The groove 7 formed in the base plate 22 can be seen in the figure, together with the bushing 4 having a partially arched U profile 16.

Fig. 32 shows the enlarged view of detail "C" introduced in Fig. 1 in case of another possible embodiment of bushing 4 and its connection. The groove 7 formed in the base plate 22 can be seen in the figure together with the bushing 4 having an arched U profile 17.

Fig. 33 shows the enlarged view of detail "C" introduced in Fig. 1 in case of another possible embodiment of bushing 4 and its connection. The groove 7 formed in the base plate 22 can be seen in the figure together with the bushing 4 having an arched ring U profile 18.

For creating the connection shown in Figs. 30 - 33 the side wall 2 is placed in a header machine at its internal part where the grooves 7 have height H, and the header machine presses the bushing 4 with the given profile onto the grooves 7.

Fig. 34 shows a possible embodiment of the connection among the bushing 4, the side wall 2 formed with groove 7 and the spacer tube 5. The bushing 4 that has a U profile 15 shape can be seen in the figure together with the side wall 2 formed with groove 7 and the spacer tube 5.

It can be seen in the figure, that the diameter D2 of the spacer tube 5 exceeds the internal diameter Dl of the side wall 2, so the side wall 2 provided with bushing 4 gets seated on the spacer tube 5. Fig. 35 shows another possible embodiment of the connection among the bushing 4, the side wall 2 formed with groove 7 and the spacer tube 5. The bushing 4 having U profile 15 shape, the side wall 2 formed with groove 7 and the spacer tube 5 can be seen in the figure.

It can be seen well in the figure that diameter D2 of the spacer tube 5 is nearly the same as diameter Dl of the side wall 2, as a result of which the side wall 2 provided with bushing 4 is fitted on the surface of the spacer tube 5 in a shape locking manner.

Fig. 36 shows another possible embodiment of the connection among the bushing 4, the side wall 2 formed with groove 7 and the spacer tube 5. The figure shows the bushing 4 having U profile 15 shape, the side wall 2 formed with groove 7 and the spacer tube 5 with the protrusion 23.

It can be seen in the figure that diameter D2 of the spacer tube 5 is nearly the same as diameter Dl of the side wall 2, as a result of which the side wall 2 provided with bushing 4 is fitted on the surface of the spacer tube 5 in a shape locking manner similarly to the case shown in Fig. 35. In this case, however, the side wall 2 that has bushing 4 seats on the protrusion 23 of the spacer tube 5, thus supporting it.

Fig. 37 shows the enlarged view of detail "B " introduced in Figure 1. The base plate 22 of the side wall with the groove 7 and rim 8 can be seen in the figure. The connecting ring 9 formed with connecting ring 10 can also be seen together with the core element 3, and the side wall 2, as well as the winding space 6 bordered by the core element 3.

It can be seen in the figure that the part of connecting lug 10 having height "m" is inserted and fixed in the groove 7. The height "m" of the connecting lug 10 is smaller than or equal to height H2 measured at this point of groove 7, i.e. H2 > m. Fig. 38 shows the view J-J introduced in Fig. 37. The figure shows the base plate 22 with the groove 7, as well as the connecting lug 10 fixed in the groove 7. It can be seen in the figure that the height "m" of the connecting lug 10 is identical to or less than the given height of the groove 7, i.e. H2 > m.

Fig. 39 shows a possible embodiment of the fixing of connecting lug 10 and groove 7 introduced in Fig. 38. The base plate 22 with the groove 7 can be seen in the figure together with the connecting lug 10 inserted in the groove 7.

It can be seen in the figure, that the connecting lug 10 is fixed in the groove 7 by deflecting the fitting part with an inclination angle g.

Fig. 40 shows a possible embodiment of the fixing of connecting lug 10 and groove 7 introduced in Fig. 38. The base plate 22 with the groove 7, and the connecting lug 10 placed in the groove (7) can be seen in the figure.

It can be seen in the figure, that the connecting lug 10 is fixed in the groove 7 by deflecting the fitting part in two directions.

Fig. 41 shows a possible embodiment of section E-E introduced in Fig. 2. A possible fitting line of the side wall 2 is shown in the figure. The fitting and fixing of the two ends of the side wall 2 is shown in the figure.

In this case the two ends of the side wall 2 are fixed to each other by fitting with overlapping of the first and last grooves of the side wall 2. Eventually, the fitting line 20 may be strengthened with adhering or by means of spot welding.

Fig. 42 and 43 show the possible fitting and fixing together of the side wall 2 and the ends of core element 3. The possible embodiments of the looping, i.e. the fitting together of opposite ends of side wall 2 or the connecting ring 9 or the core element 5 are shown in the figure. The fittings may be strengthened with adhering or by means of spot welding. In case of a possible embodiment of the cable drum 1 according the invention the side walls 2 are established first. The side wall 2 is created from rectangular base plate 22. The grooves 7 containing the nests with various shapes are established in parallel with the shorter edge of the base plate 22. The grooves 7 are created in a way that they have a height H along one of the longitudinal edges of the rectangle, which form the internal diameter D1 of the side wall. The other ends of the grooves 7 reach the height 0 at a distance l .ld - 5d from the other longitudinal edge of the rectangle. The base plate 22 having rectangular shape in its initial condition is transformed to circular shape by establishing the grooves 7 one after another as described above, and its two ends are connected in a known manner along the fitting line 20.

Then the edge of the base plate 22 is provided with rim 8 having various shapes, thus establishing the side wall 2.

After that the side wall 2 is provided with bushing 4 having various shapes at its part having internal diameter Dl . In this way it is made sure that the bushing 4 fixes the grooves 7 to one another.

Then the connecting ring 9 is created. The connecting ring 9 is established from a nearly rectangular base plate 19 by making cuts along the cutting lines 11 in the base plate 19 with an inclination angle b < 90°, with the help of which the connecting lugs 10 are created. Then the lugs are folded down in one direction along the folding lines 12 formed perpendicularly to the longitudinal edge of the base plate 19.

In a given case the lugs 10 are folded in the same direction along the folding lines 13 aligned in parallel with the longitudinal side of the base plate 19, thus creating the folds 14.

Then the base plate 19 is formed to a circular shape, and its two ends are connected to each other in a known manner along the fitting line 21. The core element 3 and the spacer tube 5 are established from the cylinder having different diameters. The core element 3 can be created from rectangular plate by rolling it to a tube, the ends of which are fixed together in a known manner for example with the method shown in Fig. 42 and Fig. 43.

The cable drum 1 is assembled from the components created as described above by fixing the side wall 2 with the bushing 4 to one of the ends of spacer tube 5. Furthermore, one connecting ring 9 is connected to the surface of each end of core element 3, so that the part of the connecting lugs 10 having height“m” of the connecting ring 9 protrude from the core element 3.

Then the core element 3 fixed with the connecting rings 9 are pushed concentrically onto the spacer tube 5 fixed with the side wall 2, so that the ends of connecting lugs 10 having height„m” are located in the nest 24 of the grooves 7 of the side wall 2, where they are fixed in a known manner.

The fixing of the connecting ring 9 and the core element 3 could be made eventually with solid joint or with shape locking snap-fit joint, or with a joint created by simultaneous deformation or by adhering.

Then the other side wall 2 provided with bushing 4 is fixed to the other external end of the spacer tube 5. This is made in a way that the ends of connecting lugs 10 having height“m” of the connecting ring attached to this side of the core element 3 are located in the nests 24 of the grooves 7 of the side wall 2, where they are fixed with known method.

In case of another possible embodiment of the cable drum 1 according to the invention the diameter of the connecting ring 9 at one side is larger relative to the other side by a value equivalent to the thickness of the core element 3, then the core element 3 can be made with a conic shape. This conic nature is so minor that the user does not sense it at all in practice, but the cone shaped core elements 3 can be placed into one another.

In case of such configuration the components can be transported in an inexpensive way to the place of final assembling, or to the cable factory.

The material of the cable drum 1 according to the invention can be metal and/or plastic and/or paper and/or ductile material. The shapes of these materials shown in the drawings can be made for example by means of castings or by application of layers irrespective of the formation technology, the bending and beading procedures. This can also be accomplished by the application of carbon fibre and two-component materials in layers, and this solution can be used and is convenient even in that case. The common feature of the latter procedures and the formation from plate is that the wall thicknesses are nearly the same in all the cases.

The advantages of the solution according the invention include the simple assembling of the components of the cable drum, and the possibility of making the components of the cable drum from dissimilar materials if required. Even in the latter case the components can be fixed together easily.

It has a further advantage that no arc welding is necessary when metal components are used.

A further advantage of the solution is that a structure can be created without waste, and which is convenient in terms of strength, leading to material saving and a relatively light structure, which could be assembled at the location of use. List of references

1 - cable drum

2 - side wall

3 - core element

4 - bushing

5 - spacer tube

6 - winding space

7 - groove

8 - rim

9 - connecting ring

10 - connecting lug

11 - cutting line

12 - folding line

13 - folding line

14 - fold

15 - U profile

16 - partly arched U profile

17 - arched U profile

18 - arched ring U profile

19 - base plate

20 - fitting line

21 - fitting line

22 - base plate

23 - protrusion

24- nest

D - diameter

D 1 - diameter

D2 - diameter

d - diameter Ll - length L2 - length L3 - length L4 - length K - width

Kl - width

V - thickness V 1 - thickness V2 - thickness V3 - thickness H - height

Hl - height H2 - height X - height

Y - width

Z - depth

S - width m - height a - inclination angle b - inclination angle g - inclination angle