FR2786172A1 - Reel drum for wire has projections on inner faces of flanges to prevent bunching of wire - Google Patents

Abstract

The wire reel drum has a central hub (1) and two circular flange plates (2). Each plate has a projection on its inner face (3), the projections being offset by one hundred and eighty degrees. The projections prevent coiling of the wire during reeling in and the resulting local bunching of the wire.

Description

"Drum whose flanges have at least one projection to distribute

  uniformly the turns of an elongated element during winding "The present invention relates to a drum for winding an elongated element, in particular a wire, an electric cable or a flexible hose, comprising a central body and two circular flanges situated at the ends of the central body,

  each flange having an internal face.

  When winding an elongated element on a drum, it frequently happens that the turns stack locally on top of each other rather than being distributed

  evenly between the two flanges.

  This local stacking is however not satisfactory because it is the cause of an abnormally early formation of turns outside the drum and of an accidental blocking of the latter. For example, when the elongated element is an electric cable wound on a drum mounted in a household appliance, this appliance may no longer be able to be used because the turns formed outside the drum prevent the latter from rotating while the cable

is not fully wound.

  The present invention proposes more particularly to remedy this drawback and, to do this, it relates to a drum having the structure indicated above and characterized in that the internal faces of the flanges each carry at least one projection, each projection located on one of the flanges being offset by 180 relative to the corresponding projection located on the other

flaccid.

  During the rotation of the drum, the elongated element regularly strikes the projections located on the two flanges of

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  so that its turns, instead of stacking locally on top of each other, are distributed evenly between the flanges. The risks for premature formation of turns outside the drum are therefore reduced, which avoids

abnormal blocking of the latter.

  Advantageously, the projections have a side extending over a predetermined distance along the periphery of the

corresponding flange.

  Because of their at least partial presence at the periphery of the flanges, these projections have the advantage of being particularly effective without however

  increase the external dimensions of the drum.

  Preferably, the projections have a maximum thickness in the middle of their side located along the periphery of the

corresponding flange.

  It is thus possible to regularly wind the elongated element between the flanges of the drum, whatever the direction.

  drive in rotation of the latter.

  In order to improve the efficiency of the projections, it is desirable that their thickness increases regularly in

  direction of the periphery of the corresponding flange.

  This arrangement also has the advantage of facilitating the retention of the turns between the flanges when the drum is

immobilized.

  According to particular embodiments of the invention, the projections can be in the form of a sector or truncated sector and have an axis of symmetry extending radially. The drum according to the invention is further characterized in that its flanges may include recesses so as to

to be lighter.

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  According to another characteristic, it can be made of plastic, which makes it possible to produce it by molding at high production rates and for cost prices.

very competitive.

  Three embodiments of the drum according to the invention will now be described by way of non-limiting examples with reference to the accompanying drawings in which: - Figure 1 is a schematic perspective view of a drum according to a first embodiment; - Figure 2 is a sectional view with partial cutaway along line II-II of Figure 1; - Figure 3 is a view with partial cutaway taken along line III-III of Figure 2; - Figure 4 is a schematic cross-sectional view of a drum according to a second embodiment, this view showing the internal face of one of the flanges of the drum; - Figure 5 is a sectional view similar to Figure 2 of a third embodiment; and - Figure 6 is a view with partial cutaway taken

  along line VI-VI of Figure 5.

  The drums that can be seen in the drawings have been developed to receive the power supply cable of a household appliance such as a vacuum cleaner. It goes without saying, however, that they could be used to allow the winding of other elongated elements, for example textile threads or flexible hoses, without thereby leaving the framework of the

present invention.

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  Referring first to Figures 1 to 3, we see that the drum shown comprises a central body 1

  carrying a circular flange 2 at each of its ends.

  The flanges 2 have a projection 3 on their internal face, the projection of one being offset by 180 by

compared to that of the other.

  The protrusions 3 have a side 4 extending over a predetermined distance along the periphery of the flanges. Preferably, the sides 4 extend over an arc of a circle

  corresponding to an angle of about 20 to 300.

  In the embodiment shown in Figures 1 to 3, the projections 3 are sector-shaped and have an axis of radial symmetry. Their thickness increases regularly from the central body 1 of the drum towards their side 4 and is maximum in the middle of this side. The drum visible in Figure 4 differs from that which has just been described with reference to Figures 1 to 3 in that its flanges 2a have recesses 5 uniformly distributed and in that the projections 3a located on the internal faces of its flanges are shaped like a truncated sector and

  do not extend to the level of the central body 1a.

  As for the drum visible in FIGS. 5 and 6, it differs from the drum shown in FIGS. 1 to 3 in that the projections 3b located on the internal faces of its flanges 2b extend only at the periphery of the latter, their thickness increasing regularly from a zero value at each of their ends to a maximum value in the middle of their side 4b which extends in

  the direction of the periphery of the flanges.

  The drums according to the invention are preferably made of plastic. They can thus be

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  manufactured by molding under very competitive production conditions, especially if they are made in one piece. Thanks to the projections provided on the internal faces of the flanges of the drums which have just been described, the turns of an electric cable being wound on these drums are now distributed uniformly between the flanges, which prevents their accidental formation out of these. 0 The solution proposed by the present invention for

  Achieving this goal is therefore particularly simple.

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Claims (9)

RESELL I CATIONS   1. Drum for winding an elongated element, in particular a wire, an electric cable or a flexible hose, comprising a central body (l, la, lb) and two circular flanges (2,2a, 2b) situated at the ends of the central body, each flange having an internal face, characterized in that the internal faces of the flanges each carry at least one projection (3.3a, 3b), each projection located on one of the flanges being offset by 180 relative to the projection   corresponding located on the other flange.   2. Drum according to claim 1, characterized in that the projections (3.3a, 3b) have a side (4.4a, 4b) extending over a predetermined distance along the periphery of the corresponding flange (2,2a, 2b).   3. Drum according to claim 1 or 2, characterized in that the projections (3.3a, 3b) have a maximum thickness in the middle of their side (4, 4a, 4b) located along the periphery the corresponding flange (2,2a, 2b).   4. Drum according to any one of claims 1 to 3,   characterized in that the projections (3.3a, 3b) have a thickness which increases regularly towards the   periphery of the corresponding flange (2,2a, 2b).   5. Drum according to any one of claims 1 to 4,   characterized in that the projections (3) are sector-shaped.   6. Drum according to any one of claims 1 to   4, characterized in that the projections (3a) are in the form of truncated sector.   7. Drum according to any one of the claims   previous, characterized in that the projections (3, 3a, 3b)   have an axis of symmetry extending radially. 7 2786172   8. Drum according to any one of the preceding claims, characterized in that the flanges (2a)   have recesses (5). 9. Drum according to any one of claims   above, characterized in that it is made of plastic.