FI105674B - Cable drum and method for its manufacture - Google Patents

Description

..1 105674

CABLE REEL AND METHOD FOR MANUFACTURING IT

The present invention relates to a cable reel having a drum and ends or flanges attached to both sides thereof, wherein in the bonding between the drum 5 and the ends, the tab portions are bent to the outer surfaces of the ends. The invention also relates to a method of making a cable coil.

Known cable reels are generally made of ribs and thicker timber. The end discs are made of cross-ribbed plates. The drum is typically made of slightly tapered ribs which form a cylindrical body. The drum is tightened between the ends by means of bolts between the ends. The aforementioned technique for making large coils is time consuming and becomes very heavy. This invention relates primarily to cable reels having a drum diameter 20 of 150 mm or greater. Small cable coils are made in one piece from plastic by casting or injection molding, but this technique is not suitable for large coils.

U.S. Patent No. 3,544,032 discloses a type 25 cable reel. The drum projections are threaded through the openings in the end and bent. Here the projections are very narrow and have a small projection. Their bending does not require much force, especially if the opening is triangular or rectangular. On the other hand, the disclosure does not disclose means for bending larger or smaller projections.

· * The object of the present invention is to provide a more robust cable reel which is simple to manufacture. Characteristic features of the invention are set forth in the appended claims. 35 The invention is largely based on the realization that the bending of substantially each portion of the curved sheet requires deformation work, which, on the other hand, should at least partially reverse the load to disengage the end from the drum.

• 105674 2

The deformation of the projections effectively locks them in place. Optimal deformation requires the exact shape of the arc hole. This is achieved by punching an arcuate opening in the end plate. Due to the large deformation work, it is advantageous and often necessary to use a power tool for bending. This will sweep the local molding along the entire length of the tab.

Other advantages and embodiments of the invention will become apparent below in connection with the embodiments. In the following, the invention will be described with reference to the accompanying drawings, which show some cable coils and parts thereof according to the invention.

Figure 1 shows the drum and its end before attaching them to one another.

15 Figure 2 shows a completed cable reel.

Figure 3 shows a detail of the cable reel, partially cut away.

Figure 4 is a sectional view of the end structures.

Figure 5 is a cross-sectional view of the drum seam.

Fig. 6 shows the bending of the projections by machine. Fig. 7 shows the manufacture of the end by stamping

The basic components of the cable coil here are two ends 1 and a drum 2 therebetween. The drum is preferably made of galvanized 25 sheets having a thickness of 0.3 to 2 mm on 160-1200 mm drums. The ends are most preferably birch or mixed plywood, but other high-strength boards, such as fibreboard or chipboard, are also possible. The manufacture of the cable coil begins by cutting the sheet into a substantially rectangular piece having notches on both edges 30 to form tabs 4. The skills for the seam 10 will be described below. From the plate, the drum 2 is folded as shown in Figure 1 and the seam 10 is secured. At the same time, a disk 1 is formed from birch plywood to form arcuate holes 11. The manufacture is preferably carried out in the form of arcuate holes as shown in Figure 7, which will be discussed in detail below, in the most preferred 35 minutes.

3, 105674

Alternatively, drill holes into the starting point of the arcs and use the jig saw to cut the required arcs. Thereafter the end 1 and the drum 2 are connected to each other, the tabs 4 are pushed through the arcuate openings 11 and the ends are pressed against the drum 5, after which the ends of the tabs 4 are bent by a hydraulic press on the outer surface of the end 1. Figure 6 shows the tool 15 and the way in which the ends 14 of the tongues 4 are bent. The tongue-forming end of the tool 15 has a blade-like shape, whereby it is bent gradually during the rotation of the tool 10. Compared to one-time bending, less force is required because the shaping is limited locally to a rather narrow area at any given time.

Figure 2 shows a finished coil showing the fold 14 of the tab 4 on the outer surface of the end 1. In addition, there is a dashed support disc 3L, which if necessary, is fitted with additional strength to the end disc 1 before the drum 2 is mounted thereon. As shown in Figure 3, the support disc 3 carries the drum 2 along its entire circumference, thereby providing additional tensile strength to the structure.

20

Figure 4 shows in detail the connection between drum 2 and end 1. Also shown here is a support disc 3. The tab 4 is inserted through the arcuate opening 11 of the drum and its head is pivoted so that folds 14 are shown against the end 1.

25

The cable coil and its cables may advantageously be protected by a sheet metal sheath 8, on which a spike 9 is formed at each of its edges.

30 The edges of the diaper keep the diaper in place. The ends include suitable locking devices, e.g., foldable tabs, for securing the damper to the reel.

The drum tongues preferably extend about 9 to 12 mm out of the 35 ends. In any case, the overhang is between 7-20 mm. Generally, tabs longer than 12 mm will remain "trimmed" from the surface of the end, since the tension produced during bending does not extend much further than 10 mm. The molding 4 105674 performed by the device of Fig. 6 pulls the tabs outward, whereby the arcuate portions between the tabs of the drum 2 bite into the inner surface of the ends l. In addition, small arc-shaped grooves can be made for these if the load capacity is to be increased in this respect. In each case, the arcuate portions will more or less bite into the inner surfaces of the ends, providing support throughout the circumference over the drum.

The seam 10 of the drum 2 is formed by overlapping the ends of the sheet 10 such that a fold 5 is formed at the lower end of the sheet so that it fits smoothly under the opposite end of the sheet as shown in Figure 5. The ends of the sheet are fixed to each other by spot welding 6 to obtain a firm and even seam 10.

15 The following types of dimensions were used in some of the cable reels manufactured. A 500mm diameter cable reel with a 240mm drum was made as follows. 0.7 mm thick galvanized sheet metal was used on the drum and 15 mm birch plywood on the ends. There were four protrusions and they were 100 mm by 20 in length (arc length). The 1500 mm diameter end was made of 25 mm birch plywood and the 1100 mm drum on it was made of 1.25 mm galvanized sheet metal. There were eight protrusions and they were 100 mm long.

25 From 150 to 1500 mm in diameter, drum 2 uses a galvanized sheet having a thickness of between 0.3 and 2 mm, such that the thickness s of the plate 2, the width 1 of the tongue 4 and the diameter D of the drum 2 meet the following condition: 3.5— < -f- <9 - ^ - im2 s2l mm2

The projection of the tab is the aforementioned 9 - 12 mm. In the cable coils 30 according to this, the curvature of the tongue causes a considerable need for deformation. The finished fold, on the other hand, withstands much higher loads than before.

Compared to bending a straight plate, the bending force on the entire tongue 35 times when bending increases by a multiple of at least 15 times. Generally, the required force would be even greater than this, which is why it is better to bend the tongue by means of local molding, which is effected by sweeping over the tongue as in Fig. 6.

5 The inner disc is used on reels of 600 mm or more in diameter, although it can be replaced by reinforcing material thicknesses on both the drum and end plate. In these too, the inner drum can still be used if the structure is to be further strengthened.

10

In the method of manufacturing the end of Fig. 7, the long-shaped blank 22 is passed through a die 16 which strikes the finished end plates 1 therefrom. The die 16 comprises a fixed lower part and a striking upper part, from which only the cutting blades 15 are drawn. For the tabs, the apertures 11 are formed by striking the upper arc blade 18 against the arcuate aperture blade 17 of the lower part. The thin arcuate piece exits through the lower blade 17. At the same time, the entire end disc can be punched out of the raw plate with blades 19. If necessary, a central opening 21 is formed with the same 20 impact blades 20.

• - ·· .τ

Claims (8)

Cable reel comprising a drum 5 (2) having a diameter of 150 to 1500 mm made of galvanized sheet steel with a thickness of 0.3 to 2 mm and end (1) or flanges attached thereto and having axially formed ends of the drum (2) arcuate tongues (4) extending through the ends (1), the respective arcuate recesses (11) being formed on the ends (1) and the portions (10) of tongues (4) projecting from these recesses (11) being bent outwardly on the outer surfaces of that the length of the protruding tab is 7-20 mm, most preferably 9-12 mm, and that the damper in the drum (2) is arranged so that the plate s of the drum (2) has a thickness s, a width of the tab (4) and (2) the diameter D 15 satisfies the following condition: 3, 5—— <<9 — Ϊ— mm s'l mm whereby the lengths and widths of the tabs (4) in the circumferential direction are such that the plate thickness and diameter of the drum (2) do not For bending tabs, the deformation work due to the 20 curved tabs is many times greater than bending a straight tab of the same width. Cable reel according to Claim 1, characterized in that the material of the ends (1) is one of the following: birch plywood, mixed plywood, fiber board, particle board. Cable reel according to Claim 1 or 2, characterized in that a support disk (3) is mounted on the ends (1) of the drum (2) which carries the drum (2) in its entire circumference. 30 Cable reel according to one of Claims 1 to 3, characterized in that the arc part of the drum (2) extending between the tabs (4) extending through the ends (1) extends into the inner surface of the end (1). 35 ..7 105674 Cable reel according to one of Claims 1 to 4, characterized in that the ends (1) have a thickness of 6 to 30 mm in a coil having a drum (2) with a diameter of between 150 and 1500 mm. Cable reel according to one of Claims 1 to 5, characterized in that the actual drum (2) for the cable has an inner support drum, which is also made of sheet metal and secured to the ends by means of tabs at the ends. 10 6 105674 A method for manufacturing a cable coil according to claim 1, wherein the sheet is made of a drum (2) having ends at its projections (4) and ends of the plate (1) forming circumferential holes (11) corresponding to the projections (4) of the drum (2). ) and wherein the drum (2) and the ends (1) are joined by pushing the projections (4) through the openings (11) of the ends and folding the projecting ends (14) to the surface of the end (1), characterized in that folding each projecting end (14) is performed by a wing member (16) which is rotated in the direction of the circumference 20 over this. A method for manufacturing a cable coil according to claim 1, wherein the tin is made of a drum (2) having projections (4) at its ends and a plurality of ends (1) formed on the plate to form arcuate openings (11) corresponding to the projections (4) of the drum (2). ) and wherein the drum (2) and the ends (1) are joined by pushing the projections (4) through the openings (11) of the ends and folding the projecting ends (14) to the surface of the end (1), characterized in that ) is formed by stamping a thin piece of sheet material off the plate. 8 105674