BE1029655A1 - COMPACT DEVICE FOR COVERING A SURFACE COMPRISING TWO AXLES FOR THE DEPLOYMENT AND REMOVAL OF THE COVER - Google Patents

Abstract

The present invention relates to a device for covering a surface comprising: (a) A covering, each longitudinal edge of which is provided with a projecting element, (b) a drum rotatably mounted on frames and capable of winding or unwinding the cover, (c) a translation system for moving the drum in translation on rails placed on either side of said surface; (d) a continuous locking/unlocking system of the projecting element in the rails during the translation of the drum, in which the translation system comprises, - a first rotation means (M1) for activating the rotation of a closing axle winding a traction cord (21) allowing the drum to be pulled in a closing direction (Dc) along the rails, and - a second rotation means (M2) for activating the rotation of the drum winding the deployed cover, allowing the drum to be pulled in an opening direction (Do) along the rails and in which, - the drum (2) is mounted in translation allowing a translation also according to a component perpendicular to the plane (X, Y) so that the drum rests permanently on the surface or on the rails.

Description

COMPACT DEVICE FOR COVERING A SURFACE COMPRISING TWO

AXLES FOR COVER DEPLOYMENT AND REMOVAL

FIELD OF THE INVENTION

The invention relates to a device for covering a surface, which is easy to implement and best meets the requirements of the application concerned. In particular, the present invention relates to a cover device in which the cover is wound around an axle of the drum forming with the latter a drum configured to move, e in a closing direction allowing the deployment of the cover above from the surface and activated by winding first and second pull cords around a closing axle by the rotation of the latter, and e in an opening direction allowing removal of the cover from the surface and activated by winding of the cover around the axle of the drum by the rotation of the latter

[0002] The cover comprises a projecting fixing element allowing the reversible anchoring of the longitudinal edges of the cover during its deployment. The covering device of the present invention is particularly simple and robust.

TECHNOLOGICAL BACKGROUND

[0003] Covers are applied to surfaces for reasons which depend on the nature of these surfaces. Thus, in the case of a basin such as a swimming pool, the cover can prevent pollution by leaves or animals, can save energy, water and reagents and can or must ensure the safety of people especially children. In a desalination pond or other treatment of a fluid, a cover prevents the dilution of liquid due to rain or excessive evaporation due to heat.

[0004] In the case of a sports field such as an outdoor clay or grass tennis court, a cover makes it possible to protect it against bad weather, and in particular intermittent rain. In addition, a vehicle body is covered in particular to ensure the stability of the load in the depression caused by the movement of the vehicle and to protect it against bad weather. Covers are also used as blinds for greenhouses, conservatories or vehicle windows to prevent overheating inside, and as sun protection for patio awnings.

[0005] In all cases, an economical hedging device is generally sought which allows easy, safe, reproducible and rapid cover and uncovering,

requiring a minimum of human intervention and, above all, having a lifespan as long as possible. Many surface covering devices have been developed, ranging from basic to more sophisticated models. For example, a first quite basic device used in the case of a swimming pool comprises an inflatable or non-inflatable cover that is , extends and fixes manually on the edges of the swimming pool. This type of device is illustrated for example in the documents US6691334, GB2379163 and FR2652373. It is clear that here taking into account the handling and the storage, only swimming pools of rather small size are concerned.

[0006] Many devices use a rotating drum to roll up and store the cover when the surface is uncovered. Surface covering devices using a rotating drum can be classified into two categories. (a) Devices comprising a drum fixed to one of the transverse ends of the surface to be protected. The cover is deployed by pulling, unwinding from the drum and is dragged along the surface during its deployment and also when it is withdrawn. This generates significant friction which increases the force required to deploy and withdraw the cover, and accelerates the wear of the cover. Automatic covering devices are illustrated in particular in the following documents: US3574979,

GB2199741, US2005/0097834, CA2115113, US2001/0023506, US5930848, US400190.. (b) Devices in which the drum is mounted on a motorized or manual longitudinal translation mechanism. This moves the drum above the surface to be covered, which literally allows the cover to be "placed" on the surface, when it is deployed, by simultaneously unrolling it from the drum during its longitudinal movement, then lifting it, when of its withdrawal, simultaneously winding it on the drum. The cover therefore does not slip on the surface either during its deployment or during its removal. Examples of automatic devices of this type are disclosed for example in the following documents: WO2005/026473, FR2900951, DE2257231,

FR2893651, FR2789425, FR2743502, EP1719858.

The present invention relates to devices (b) in which the drum is configured to move in longitudinal translation for the advantages they have over devices (a) comprising a drum fixed to a transverse end of the surface.

In the present application, the terms "longitudinal" "transverse" and their derivatives refer respectively to the direction of movement of the drum, which is parallel to a longitudinal axis (X) and to the direction of the axis of revolution. of the drum, which is parallel to a transverse axis (M).

[0009] In many applications, it is advantageous to lock the longitudinal edges of the cover as it unfolds. This is particularly interesting in the case of swimming pools, as it prevents people stepping on the cover from being thrown into the water through a gap between the longitudinal edge of the cover and the edge of the pool. In addition, sealing the peripheral contact area between the cover and the longitudinal edges of the surface can prevent the introduction into the pool of dirt, dead leaves and twigs as well as small animals such as mice or snakes. This also opens the possibility of pressurizing the volume of air between the surface of the water and the lower surface of the cover, in order to inflate it. More sophisticated devices have been proposed making it possible to reversibly fix the longitudinal edges of the cover during its deployment, as in the document

FR2803769 which provides a system for fixing the longitudinal edges of the cover consisting of grid sections rising then folding down section by section on said longitudinal edges of the cover, maintaining these edges inside a gutter as the course of it. In this design, the longitudinal edges of the cover are pinched without being locked, which provides less security especially in the case of swimming pools.

[0010] An advantageous system making it possible simultaneously to fix the longitudinal edges of the cover during its deployment and to exert a transverse tensile force thereon to stretch it perfectly has been disclosed in WO2010/010152, WO2010054960 and in

WO2014064138. In these devices, the longitudinal edges of the cover are provided with a continuous bead or bead which is introduced into the opening oriented upwards of a rail in the form of a U-shaped section profile, with one or two fins partially closing said opening. The bead slipping under a fin and retained in this position by suitable fixing means, makes it possible to firmly fix the longitudinal edges of the cover.

[0011] The drum movement system described in WO2010054960 comprises, on the one hand, a carriage comprising at each of its ends: e a drive wheel whose axis of rotation is parallel to that of the drum, which is preferably motorized ; e at least two rollers resting on the rails and allowing the longitudinal translation of the carriage), and being mounted on either side of the drive wheel, and constituting with the latter a triangle whose drive wheel forms the upper vertex and, on the other hand, two flexible belts fixed only at each of their ends to the four corners of the surface to be covered, each of the two belts,

e being arranged in the opening of the rails in the lateral sections comprised between a fixing point and the roller closest to said fixing point, and e capping the driving wheel without slipping in the central section lying between the two rollers

[0012] The rotation of the drive wheels which grip the flexible belts which are fixed without slipping, causes the translation of the drum along the rails. The translation of the drum in the closing direction from a second width of the surface to a first width of the surface also automatically causes the rotation of the drum which spontaneously unrolls the cover by the force exerted on the cover by an end fixed to the second width from the surface. The rotation of the drum also makes it possible to tension a torsion spring which reaches its maximum tensioning point when the drum reaches the first width of the surface and the cover completely covers the surface. When the drum moves in the (reverse) opening direction, the torsion spring relaxes causing the drum to rotate allowing the cover to be wrapped around the drum axle.

[0013]. This translation system gives excellent results and has been implemented in many projects, in particular for swimming pool covers. However, the tension of the torsion spring necessary for the rotation of the drum allowing the rolling up of the cover when it is removed from the surface requires additional energy from the motor causing the rotation of the drive wheel during the deployment of the cover when the drum moves in the closing direction. In addition, a certain precision in the alignment of the components of the locking and translation system is necessary for optimal operation, which makes the system less robust in the event of extreme conditions of use or misuse.

[0014] It would be interesting to have a covering device giving the same advantages as that described in WO2010054960, and which is simpler and more robust under extreme conditions of use. The present invention proposes such a device, the translation system of which comprises a closing axle, the rotation of which makes it possible to activate the translation of the drum in the direction of closing during the deployment of the cover and a drum axle, the rotation of which makes it possible to activate the translation of the drum in the opening direction when removing the cover. These and other benefits are described in more detail in the following sections.

SUMMARY OF THE INVENTION

The invention is as defined in the main claim and preferred variants are defined in the dependent claims. The present invention comprises in particular a device for covering a surface comprised in a rectangle comprising first and second lengths extending parallel to a longitudinal axis (X) and first and second widths extending parallel to a transverse axis (Y), normal to the longitudinal axis (X), and defining therewith a plane (X, Y). The device includes the following elements.

The device comprises a substantially rectangular cover of dimensions equal to those of the rectangle and having first and second longitudinal edges opposite each other and first and second transverse edges opposite each other. The second transverse edge is fixed to the second width of the rectangle in which the surface is inscribed.

Each longitudinal edge is provided with a projecting element extending along the corresponding longitudinal edge defining a profile in section normal to the corresponding longitudinal edge having a minimum diameter (d).

[0017] Two rails are placed on either side of the surface, parallel to the longitudinal axis (X).

Each rail is made up of a profile having an opening on one of its faces and facing away from the surface to be covered. The opening gives access to a space in the rail defining with the opening a groove extending all along each rail.

[0018] A drum is formed by an axle and at least a portion of the cover which is at least partially wrapped around the axle and whose first transverse edge is fixed to the axle, in which, and the drum extends above the surface parallel to the transverse axis (Y), in which the axle is mounted at each of first and second ends on first and second frames, on the one hand, for rotation allowing to roll up and unroll the cover and, on the other hand, in translation allowing a translation of the drum parallel to the longitudinal axis (X) along the two rails, on the one hand, in a closing direction (Dc) and , on the other hand, in an opening direction (Do), the axle is provided with a second drum rotation means (M2) making it possible to rotate the drum in one direction to roll up the cover on the drum and at the same time cause the longitudinal translation of the drum in the direction of opening (Do) causing the removal of the cover from the surface e, e an insertion system comprising a cover insertion pulley adjacent to the drum on each of the first and second frames on each side of the surface to be covered and making it possible to guide, position and insert the element protruding from each edge longitudinal of the cover in space through the opening of the corresponding rail during the translation in the closing direction (Dc) of the drum, the insertion system comprising a cover insertion pulley.

The protruding element of each longitudinal edge and the groove of the corresponding rails are configured so that once inserted into the space by the insertion system, the protruding element occupying the space alone; e cannot come out of it by the sole action of a force (F) applied parallel to the transverse axis (Y) in the direction of the surface to be covered, and e can come out of it when the cover is rolled up on the drum moving in the opening direction (Do) causing the cover to withdraw,

According to the present invention, the drum is mounted in translation allowing a translation also according to a component perpendicular to the plane (X, Y) so that the drum rests permanently, e is on a cover portion between the second transverse edge and the cover insertion pulley of the insertion system provided downstream of the drum, for any value of a radius of the drum which depends on the length of cover rolled up on the axle of the drum, e either on the rails or on the surfaces adjacent to the rails comprised between each rail and the surface, downstream of the cover insertion pulley of the insertion system, in which the term "downstream" is defined relative to the direction of closure (Dc).

The device includes first and second pull cords, each including a movable end coupled to move with the first and second frames and a fixed end coupled to first and second corners of the surface, respectively, to remain substantially stationary in the direction of the longitudinal axis (X). The first and second corners are defined by the intersection of the surface's first width and the first and second lengths, respectively.

[0022] The device also comprises a closing axle extending parallel to the transverse axis (Y) and comprising first and second ends each fixed in rotation allowing the winding and unwinding of the first and second pull cords. The closing axle is provided with a first axle rotation means for rotating the closing axle in one direction to wind the first and second tensile cords on the closing axle and at the same time drive the translation longitudinal direction of the frames and the drum along the two rails in the closing direction (Dc), causing the rotation of the drum and the deployment of the cover on the surface.

In a variant of the invention, the fixed end of each pull cord is coupled to the corresponding first or second corner of the surface. The moving end of each pull cord is coupled to the closing axle. Finally, the closing axle is coupled to the first and second frames downstream of the drum.

[0024] In an alternative variant of the invention, the fixed end of each pull cord is coupled to the corresponding first or second corner of the surface. The movable end of each pull cord is coupled to the closing axle. Finally, the closing axle is coupled to the first and second frames and is positioned inside of and coaxial with the drum axle.

[0025] In another alternative variant, the closing axle is positioned at the level of the first width of the surface. The fixed end of each pull cord is coupled to the closing axle at the corresponding first or second corner of the surface. Finally, the movable end of each pull cord (is attached to the corresponding frame.

[0026] It is preferable that the device comprises first and second return pulleys provided on the first and second frame on each side of the surface to be covered, making it possible to guide, position and insert the corresponding traction cord in the space through the opening of the corresponding rail during translation in the opening direction of the drum.

The translation according to the component perpendicular to the plane (X, Y) can be made possible by mounting the drum on each of the first and second frames by means of either e a lever arm comprising a first end coupled to a respective frame, and a second end rotatably coupled to the drum, the lever arms being configured to pivot relative to the respective frames about an axis parallel to the transverse axis (Y), or e of a guide s' extending along at least one component normal to the (X,Y) plane.

[0028] The guide or the rotation of the lever arm allows the first and second ends of the drum to rest permanently on the rails or on the surfaces adjacent to the rails between each rail and the surface, including during movements of the drum in the opening (Do) and closing (Dc) directions.

The first shaft rotation means and the second drum rotation means preferably comprise a motor or a crank.

In a first preferred embodiment of the invention, the protruding element of each longitudinal edge and the groove of the corresponding rails are configured such that, e The protruding element preferably extends continuously along the along each longitudinal edge of the cover,

e in a section normal to each longitudinal edge of the cover, the corresponding projecting element defines a generally convex geometry, in which a convex geometry is defined as a planar geometry defined by a closed perimeter that no straight line can cross more than twice. A "generally complex" geometry does not preclude a small indentation relative to the dimension of the cut, as long as the cut has an overall geometry that is convex. e in a cross-section, normal to the longitudinal axis (X), the opening of the groove has a maximum width (Lo), and the space has a maximum width (Le) greater than the maximum width (Lo) of the opening (Lo < Le), where the maximum widths (Lo, Le) are measured parallel to the transverse axis (Y), and, e the projecting element of each longitudinal edge and the groove of the corresponding rail are configured so that, once inserted into the space by the cover insertion pulley, the projecting element occupying the space alone cannot come out of it by the sole action of a force (F) applied parallel to the axis transverse (Y) in the direction of the surface to be covered.

In a variant of the first embodiment of the invention defined above, the projecting element of each longitudinal edge and the groove of the corresponding rails are configured such that, e The projecting element preferably extends from continuously along each longitudinal edge of the cover, e the minimum diameter (d) of the projecting element is less than the maximum width (Lo) of the opening (d < Lo), e the projecting element has a maximum diameter (D) greater than the maximum width (Lo) of the opening (Lo < D), and wherein e the cover insertion pulley is configured to orient the projecting member through the opening of the corresponding rail having a diameter between d and D and less than Lo, the protruding element changing its orientation once the protruding element is in space.

In an alternative variant of the first embodiment of the invention defined above, the projecting element of each longitudinal edge and the groove of the corresponding rails are configured such that the projecting element of each longitudinal edge, one hand, is preferably continuous and, on the other hand, is compressible such that,

e in a rest configuration, the minimum diameter (d) is equal to dO which is between the maximum widths (Lo, Le) of the opening and the space of the corresponding rail (ie, Lo < d0 < Le) , and e in a compressed configuration, the minimum diameter is equal to d1, which is less than or equal to the maximum width (Lo) of the corresponding rail opening (i.e., d1 < Lo),

[0033] The cover insertion pulley compresses the protruding member into its compressed configuration when inserted through the corresponding rail opening, the protruding member covering its alignment configuration once that the protruding element is in space.

In another alternative variant of the first embodiment of the invention defined above, the projecting element of each longitudinal edge is a cable in the form of consecutive turns forming a helical spring, the axis of which is parallel to the edge. corresponding longitudinal length of the cover, in which the turns are defined such that, e in a rest configuration, the minimum diameter (d) measured parallel to the transverse axis (Y) of each turn at rest is equal to dO which is included between the maximum widths (Lo, Le) of the opening and the corresponding rail space (Lo < d0 < Le), and e in a deformed configuration, the angle formed by the deformed turns with the longitudinal axis ( X) is modified so that the minimum diameter (d) measured in a plane normal to the longitudinal axis (X) of each deformed turn is equal to d1 which is less than or equal to the maximum width (Lo) of the opening of the corresponding rail (d1 € Lo).

[0035] The insertion system makes it possible to locally deform turns in their deformed configuration during their insertion through the opening of the corresponding rail, the turns covering their rest configuration once they are in space.

In a second embodiment of the present invention, the projecting element of each longitudinal edge comprises a plurality of hooks placed side by side and having an "L" or "j" profile, having e a portion continuously aligned with the surface of the cover and fixed to the corresponding longitudinal edge of the cover, and e a transverse portion forming the hook, extending transversely with respect to the aligned portion.

Each rail comprises a wing partially closing the side of the opening of each rail adjacent to the surface to be covered and capable of receiving the transverse portion of the hooks.

The device of the present invention preferably comprises at least first and second anti-lifting guides comprising an external portion coupled to the first and second corresponding frame and an internal portion coupled to the corresponding rail, so as to be able to slide freely along the rails parallel to the longitudinal axis (X) and cannot be extracted from the rails by the application of a force perpendicular to the longitudinal axis (X).

The device of the present invention can be used to cover a surface selected from: e a pool filled or not with a liquid; or e a sports field, or e a vehicle body, or e a glazed surface; e an opening in a wall.

BRIEF DESCRIPTION OF FIGURES

These aspects as well as other aspects of the invention will be clarified in the detailed description of particular embodiments of the invention, reference being made to the drawings of the figures, in which:

Fig.1 overall view of a device for covering a surface formed by a swimming pool.

Fig.2(a) view of a first variant of the drum translation system in the closed position.

Fig.2(b) view of the first variant of the drum translation system of Figure 2(a) in the open position.

Fig.2(c) view of a second variant of the drum translation system in the closed position.

Fig.2(d) view of the second variant of the drum translation system of Figure 2(c) in the open position.

Fig.3(a) view of a third variant of the drum translation system in the closed position.

Fig.3(b) view of the third variant of the drum translation system of Figure 3(a) in the open position.

Fig.3(c) view of a fourth variant of the drum translation system in the closed position.

Fig.3(d) view of the fourth variant of the drum translation system of Figure 3(c) in the open position.

Fig.4(a) view of a variant of the cover device translation system.

Fig.4(b) view of an alternative variant of the cover device translation system.

Fig.4(c) view of another alternative variant of the cover device translation system.

Fig.4(d) view of another alternative variant of the cover device translation system.

Fig.5(a) view of a variation of the cover device in the open position.

Fig.5(b) view of the variant of Figure 5(a) of the covering device with the drum in translation in the closing direction, deploying the covering above the surface.

Fig.5(c) view of the variant of Fig. 5(a) of the cover device in the closed position.

Fig.5(d) view of the variant of Figure 5(a) of the covering device with the drum in translation in the opening direction, removing the covering from the surface.

Fig.6(a) view of a variant of the cover device in the open position.

Fig.6(b) view of the variant of Figure 6(a) of the covering device with the drum in translation in the closing direction, deploying the covering above the surface.

Fig.6(c) view of the variant of Fig. 6(a) of the cover device in the closed position.

Fig.6(d) view of the variant of Figure 6(a) of the covering device with the drum in translation in the opening direction, removing the covering from the surface.

Fig.7(a) view of a variation of the cover device in the open position.

Fig.7(b) view of the variant of Figure 7(a) of the covering device with the drum in translation in the closing direction, deploying the covering above the surface.

Fig.7(c) view of the variant of Fig. 7(a) of the cover device in the closed position.

Fig.7(d) view of the variant of Figure 7(a) of the covering device with the drum in translation in the direction of opening, removing the covering from the surface.

Fig.8(a) cross-sectional view of a variant of an element protruding from the rail.

Fig.8(b) cross-sectional view of the variant of Fig. 8(a) of the projecting element introduced into the opening of the rail.

Fig.8(c) cross-sectional view of the variant of Fig. 8(a) of the projecting element locked in the opening of the rail.

Fig.8(d) perspective view of the variant of Fig. 8(a) of the projecting element locked in the rail opening.

Fig.9(a) sectional view of another variant of element projecting out of the rail.

Fig.9(b) cross-sectional view of the variant of Fig. 9(a) of the protruding element as it is inserted into the rail opening.

Fig.9(c) cross-sectional view of the variant of Fig. 9(a) of the projecting element locked in the opening of the rail.

Fig.10(a) sectional view of another variant of element protruding from the rail.

Fig.10(b) cross-sectional view of the variant of Fig. 10(a) of the protruding element as it is inserted into the rail opening.

Fig.10(c) cross-sectional view of the variant of Fig. 10(a) of the projecting element locked in the rail opening.

Fig. 10(d) top view of the variation of Fig. 10(a) of the projecting element locked in the rail opening.

Fig. 10(e) side view of the variant of Fig. 10(a) of the projecting element locked in the rail opening.

Fig.11(a) sectional view of another variant of element protruding from the rail.

Fig.11(b) cross-sectional view of the variant of Fig. 11(a) of the projecting element locked in the rail opening.

Fig.11(c) perspective view of the variant of Fig. 11(a) of the projecting element locked in the opening of the rail.

Fig.12 sectional view of an anti-lifting element mounted on a rail.

Fig.13 side view of a variant of the protruding element insertion system.

Fig.14 perspective view of the drum with insertion system and guide in the form of an elongated opening in the frame.

Fig.15(a) view of a first variant of the system for inserting the protruding element and for moving the drum into the closed position (ie, the cover is not or only slightly rolled up on the axle of the drum) , with a guide in the form of an elongated opening extending perpendicular to the plane (X,Y).

Fig.15(b) view of the first variant of Figure 15(a) in the open position (i.e, the cover is rolled up on the drum axle).

Fig.15(c) view of a second variant of the system for inserting the protruding element and for translating the drum into the closed position (ie, the cover is not or only slightly rolled up on the axle of the drum) , with a guide in the form of a curvilinear opening.

Fig.15(d) view of the second variant of Figure 15(c) in the open position (i.e., the cover is rolled up on the drum axle).

DETAILED DESCRIPTION OF THE INVENTION

As shown in Figure 1, the (automatic) device for covering (1) a surface (3) according to the invention comprises a cover (10) intended to protect said surface (3). The surface (3) is comprised in a rectangle comprising first and second lengths extending parallel to a longitudinal axis (X) and first and second widths extending parallel to a transverse axis (Y), normal to the longitudinal axis ( X), and defining with it a plane (X, Y). The device (1) makes it possible in particular to cover surfaces defined by the outline of a water basin such as a swimming pool, water treatment basin, wastewater treatment plant, retention basin, desalination etc. However, the invention can be implemented in any field requiring the coverage of a surface, such as for example a sports field, such as a clay or grass tennis court, a vehicle body, a surface window, for example of a greenhouse, of a window of a vehicle such as a train or bus, or of a winter garden, or an opening in a wall, etc. In general, therefore, in the present application, the term “surface” means any zone delimited by a substantially rectangular perimeter.

The device (1) comprises a substantially rectangular cover (10) of dimensions equal to that of the rectangle and having first and second longitudinal edges opposite each other and first and second transverse edges (10m, 10f) opposite to one another. As illustrated in Figures 8 to 11 and 14, each longitudinal edge is provided with a projecting element (12) extending along the corresponding longitudinal edge defining a profile in section normal to the corresponding longitudinal edge having a minimum diameter (a) .

The second transverse edge (10f) of the cover is fixed to the second width of the surface (3). Any type of fixing system known and suitable for the criteria of constraints, safety and, where applicable, sealing, depending on the application can be used to fix the second transverse edge (10f) to the second width of the surface. For example, the fastening system may comprise a plurality of straps secured to the second transverse edge of the cover (10), said straps being for example provided with anchor hooks which are fixed along the second width of the surface to cover (3). Alternatively, the second transverse edge of the cover can be provided with eyelets which are fixed to the second width of the surface by means of a series of studs, screws, a cable or rope, or any other means. Another variant is to wedge the second transverse edge of the cover under a plate of length corresponding to the width of the cover, this plate being fixed to the surface by screws passing through the cover. These anchoring means and others too numerous to be mentioned all, keep immobilized the second transverse edge (10f) of the cover (10).

The device comprises two rails (6) placed on either side of said surface (3) parallel to the longitudinal axis (X). Each rail consists of a profile having an opening (14) on one of its faces and facing away from the surface to be covered. The opening gives access to a space (14e) in the rail defining with the opening a groove extending all along each rail, some examples of which are illustrated in Figures 8 to 12.

[0045] A drum (2) is formed of an axle (2nd) and at least a portion of the cover (10) whose first transverse edge (10m) is fixed to the axle (2nd), and which is at the less partially wrapped around the axle. The drum (2) extends above the surface parallel to the transverse axis (M). As illustrated in Figures 4 to 7, the axle (2e) is mounted at each of a first and second ends on the first and second frame (23), on the one hand, e rotation allowing to roll up and unroll the cover (10 ) in order to remove the cover and to deploy it on the surface, respectively and, on the other hand, e in translation allowing a translation of the drum parallel to the longitudinal axis (X) along the two rails (6), of on the one hand, in a closing direction (Dc) to deploy the cover on the surface and, on the other hand, in an opening direction (Do) to remove the cover from the surface.

An insertion system comprises an insertion pulley (32) of the cover adjacent to the drum (2) on each of the first and second frames (23) on each side of the surface to be covered. The insertion system makes it possible to guide, position and insert the projecting element (12) of each longitudinal edge of the cover into the space (14e) through the opening (14) of the corresponding rail (6) during the translation in the closing direction (Dc) of the drum and to disengage it during the translation in the opening direction (Do). As illustrated in the

Figures 8 to 11, the projecting element (12) of each longitudinal edge and the groove of the corresponding rails are configured so that once inserted into the space (14e) by the insertion system, the projecting element occupying the space (14th) alone, it cannot come out of it by the sole action of a force (F) applied parallel to the transverse axis (Y) in the direction of the surface to be covered (see Figure 1), and e can come out when the cover (10) is rolled up on the drum (2) moving in the opening direction (Do) causing the cover to be removed.

[0047] The essence of the present invention is the drum translation system in the two directions (Dc, Do) of closing and opening, which is compatible with the system of insertion / uninsertion of the protruding element (12) of the cover in the opening and the space of the rail (14, 14e). The drum translation system of the present invention combines the rotation of the axle (2e) of the drum and the rotation of a second axle - the closing axle (1) - as well as a freedom of movement of the drum ( 2) in the direction perpendicular to the plane (X,Y).

[0048] In order to activate the translation of the drum in the opening direction (Do), the axle (2nd) is provided with a second drum rotation means (M2) allowing the drum to be rotated in one direction. to roll the blanket (10) onto the drum. As the second longitudinal edge (10f) is fixed to the second width of the surface, the rotation of the drum in the right direction creates a traction parallel to the longitudinal axis (X) on the cover which pulls the drum, thus causing the translation longitudinal length of the drum in the direction of opening (Do) allowing the removal of the cover from the surface (3). The second drum rotation means (M2) may comprise a motor or a crank. The motor (M2) is preferably an electric motor and it is advantageously powered by batteries connected to photovoltaic cells. The axle (2e) of the drum can turn freely in the other direction of rotation, i.e. in the direction of unwinding the cover when the drum moves in the closing direction (Dc).

In order to activate the translation of the drum in the closing direction (Dc), the device comprises first and second traction cords (21), each comprising a movable end (21m) coupled so as to move with the first and second frames (23) and a fixed end (21f) coupled to first and second corners of the surface, respectively, so as to remain substantially stationary in the direction of the longitudinal axis (X). The first and second corners are defined by intersection between the first width of the surface and the first and second lengths, respectively.

A closing axle (1) extending parallel to the transverse axis (Y) and comprising first and second ends each fixed in rotation allows the winding and unwinding of the first and second pull cords (21). The closing axle (1) is provided with a first rotation means (M1) of the axle (1) for rotating the closing axle in one direction to wind the first and second pull cords (21) on the opening axis (1) and at the same time drive the longitudinal translation of the frames (23) and of the drum (2) along the two rails in the closing direction (Dc). As the second longitudinal edge (10f) is fixed to the second width of the surface, the translation of the drum in the closing direction (Dc) moves the drum away from the second width and creates a tension on the cover parallel to the longitudinal axis (X) which causes the free rotation of the drum (2) and the deployment of the cover on the surface (3) while the drum is moving. The closing axle (1) can rotate freely in the other direction of rotation, i.e., in the direction of unwinding of the pull cords (21) when the drum moves in the opening direction (Do).

The drum (2) is mounted in translation allowing a translation also according to a component perpendicular to the plane (X, Y) so that the drum rests permanently, e is on a cover portion between the second transverse edge (10f ) and the cover insertion pulley (32) of the insertion system provided downstream of the drum (2), for any value of a radius (R) of the drum which depends on the length of cover wound on the axle (2e) of the drum, e either on the rails or on the surfaces adjacent to the rails between each rail and the surface, downstream of the cover insertion pulley (32) of the insertion system.

The term “downstream” is defined relative to the direction of closure (Dc).

CLOSURE AXLE (1) AND PULL CORDS (21)

In a first variant illustrated in Figures 4(a), 4(d), 5(a) to 5(d), and 7(a) to 7(d), the fixed end (21f) of each pull cord (21) is coupled to the corresponding first and second corners of the surface. The movable end (21m) of each pull cord (21) is coupled to the closing axle (1) and the closing axle (1) is coupled to the first and second frames (23) downstream of the drum ( 2). The rotation of the closing axle (1) in the right direction rolls up the traction cords (21), applying traction to them in a direction parallel to the longitudinal axis (X) activating the translation of the drum in the direction of closing (Dc).

[0054] In a second variation, illustrated in Figure 4(c), the fixed end (21f) of each pull cord (21) is coupled to the corresponding first or second corner of the surface. As in the first variant, the movable end (21m) of each traction cord (21) is coupled to the closing axle (1). The closing axle (1) is also coupled to the first and second frames (23) but not downstream of the drum, but is positioned inside and coaxially with the axle (2e) of the drum (2). This variant makes it possible to reduce the size of the structure formed by the frames (23) and by the drum and closure axles (1, 2e).

[0055] In a third variant, illustrated in Figures 4(b) and 6(a) to 6(d), the closing axle (1) is not coupled to the frames (23) but is positioned at of the first width of the surface. For aesthetic reasons and to minimize clutter, as illustrated in the previous Figures, it is preferred that the closing axle (1) be positioned in a trench below the level of the plane (X,Y) at the level of the cover. The fixed end (21f) of each pull cord (21) is coupled to the closing axle (1) at the corresponding first and second surface corners. Whereas in the first and second previous variants the fixed end (21f) each fixed to a corner of the surface were perfectly immobile, in the present variant they are only substantially immobile in the direction of the longitudinal axis (X) , because they can oscillate by an amplitude equal to the radius of the closing axle (1) during the rotation of the latter. The amplitude of oscillation is however negligible compared to the length of the surface (3) and it can therefore be considered that the fixed ends (21f) remain substantially immobile in the direction of the longitudinal axis (X) relatively to the distance traversed by the mobile ends (21m) which precede the drum (2) along the length of the surface (3) in the closing direction (Dc). The movable end (21m) of each pull cord (21) is fixed to the corresponding frame (23). As in the previous variants, rotation of the closing axle applies a pull to the pull cords (21) which pull the drum in the closing direction (Dc). This variant, like the second variant, is very compact and also provides easy access to the closing axle for handling.

[0056] In all cases, when the drum moves in the opening direction (Do) activated by the rotation of the drum by the second rotation means (M2), the pull cords (21) spontaneously unwind from the closing axle (1) which rotates freely in this direction. It is preferred that, when moving the drum in the opening direction (Do), the pull cords (21) fit into the opening (14) of the rails (6) along the length separating the first transverse edge from the surface to the drum as they unwind from the closing axle (1). If the pull cords (21) are sized correctly, obstructing the opening (14), this prevents foreign bodies, such as gravel, dust, dead leaves, mud, etc. enter through the opening and fill the space (14th). To allow the corresponding pull cord (21) to be guided, positioned and inserted into the space (14e) through the opening (14) of the corresponding rail (6) during translation in the opening direction (Do) of the drum, the device can be equipped with first and second return pulleys (31) provided on the first and second frame (23) on each side of the surface to be covered, as illustrated in Figures 2 to 4.

[0057] As the projecting element of the cover (10) is inserted into the space (14e) between the drum (2) and the second width of the surface, the opening is constantly obstructed and protected over practically the entire length of the rails, with the exception of the portion of rails close to or at the level of the drum. This greatly facilitates the maintenance of the device.

The first axis rotation means (M1) can comprise a motor or a crank.

The motor is preferably an electric motor and it is advantageously powered by batteries connected to photovoltaic cells.

FREEDOM OF MOVEMENT OF THE DRUM PERPENDICULAR TO THE PLANE (X,Y)

The drum (2) is coupled to the first and second frame (23) allowing a translation also according to a component perpendicular to the plane (X, Y). In this way, the drum rests permanently on the rails or on the surfaces adjacent to the rails between each rail and the surface, including during the movements of the drum (2) in the opening (Do) and closing ( DC). If the drum axle (2e) is surrounded by a cover portion, the drum rests on this cover portion. If, on the other hand, the cover is completely unrolled from the axle, this may be the case when the surface is completely covered, then it is the axle of the drum (2nd) which rests on the rails or adjacent surface. Depending on whether the insertion pulley (32) is located upstream or downstream of the drum (in the closing direction (Dc)), the drum rests directly on the rails and/or at least a portion of the surface between the rails, or it rests on an already locked cover portion covering a portion of the surface between the rails directly downstream of the drum, respectively (compare e.g., Figures 2(a) and 2(b) with Figures 2(c) ) and 2(d)).

In a first variant illustrated in Figures 1, 2(a) to 2(d), 4(a) to 4(d) and 13, the freedom of movement of the drum perpendicular to the plane (X,Y) is made possible by a lever arm (2L) comprising a first end coupled to a respective frame, and a second end rotatably coupled to the drum, the lever arms being configured to pivot relative to the respective frames about an axis parallel to the transverse axis (Y). The drum can therefore move on a plane normal to the plane (X,Y) and parallel to the longitudinal axis (X) on a circular arc trajectory. If the plane (X,Y) is substantially horizontal, the drum rests spontaneously on the rails by gravity. If the plane (X,Y) has a significant vertical component, the lever arm (2L) can be provided with a spring which pushes the drum against the rails.

[0061] In a second variant illustrated in Figures 3(a) to 3(d), 14 and 15(a) to 15(d), the freedom of movement of the drum perpendicular to the plane (X,Y) is made possible by a guide (2r) extending along at least one component normal to the plane (X,Y). The guide may be formed by an elongated opening drilled in each frame as shown in Figure 14.

Alternatively, a rail, gully, channel, or protrusion may form the guide. The guide (2r) should preferably extend along the direction perpendicular to the plane (X,Y) over a height at least equal to the difference in radius (R) of the drum when it is in the fully open position (= maximum of R) and fully closed position (= minimum of

R).In a variant, the guide (2r) is rectilinear and normal to the plane (X,Y) as illustrated in the

Figures 3(a) to 3(d), 14, 15(a) and 15(b). Alternatively, the guide (2r) can also extend along a component parallel to the longitudinal axis (X). For example, the guide (2r) can be straight and extend transversely but not perpendicularly to the plane (X,Y) or can be curvilinear as illustrated in Figures 15(c) and 15(d).

As for the lever arm (2L) discussed above, if the plane (X, Y) is substantially horizontal, the drum rests spontaneously on the rails by gravity. If the plane (X,Y) has a significant vertical component, the guide (2r) can be equipped with a spring which pushes the drum against the rails.

POSITION OF THE DRUM (2) IN RELATION TO THE COVER (10)

The cover (10) can be arranged on the axle (2nd) of the drum in two ways.

The cover can come into contact with the rails, e either downstream of the drum which is therefore placed on the portion of cover already deployed (see e.g., Figures 2(a) & 2(b)), e or upstream of the drum which therefore rests directly on the rails or the adjacent surface (cf. e.g., Figures 2(c) & 2(d)).

The terms “upstream” and “downstream” are defined relative to the closing direction (Dc) of the translation of the drum (2).

Contact point cover / rails downstream of the drum

[0065] As illustrated in Figures 2(a), 2(b), 3(a), 3(b), and 4(a) through 4(c), 5, and 6, the cover (10) can enter in contact with the rails and the downstream surface of the drum (2) in the closing direction (Dc). The insertion system, comprising the insertion pulley (32) must also be positioned downstream of the drum in order to allow the cover to cover the insertion pulley (32) and thus insert the protruding elements into the opening (14) corresponding rails (©) before the drum (2) rolls over the cover portion thus extending downstream. This configuration is advantageous in the case where the surface includes a cavity such as a swimming pool because, as the drum rests on the cover already laid and stretched, the portion of the cover rolled up on the axle (2nd) of the drum cannot hang freely and the if applicable, contact the water in the pool before deploying or removing the cover. This also protects the edges of the cover (10) which does not rest directly on the coping or on the rails.

Contact point cover / rails upstream of the drum

As illustrated in Figures 2(c), 2(d), 3(c), 3(d), 4(d), 7 and 13 to 15, the cover (10) may come into contact with the rails and the surface upstream of the drum (2) in the closing direction (Dc). The insertion system is therefore positioned upstream of the drum (2) in order to insert or disengage the projecting elements (12) in the opening of the rails as the drum moves. This variant has the advantage of simplifying the installation of the cover in the system of inserting the protruding element into the rail opening. The drum rests directly on the rails and/or on a portion or on the entire width of the surface between the two rails depending on whether or not the surface includes a cavity.

INSERTION SYSTEM

The device insertion system is used to engage and disengage the projecting elements (12) as the drum moves. It comprises at least one insertion pulley (32) which makes it possible to insert the projecting element through the opening (14) into the space (14e). The insertion pulley is a pulley fixed in rotation to a frame (23) allowing the rotation of the pulley around an axis of rotation preferably substantially parallel to the transverse axis (Y). The pulley is substantially aligned with the opening (14) of the corresponding rail and can preferably partially penetrate the opening.

[0068] If the deployed cover is to be stretched in the direction of the width, it is necessary to apply a tension on the cover in order to align the projecting element with the opening (14) before the insertion pulley 'insert into the opening. To do this, the insertion system may include a tensioner (36) of the protruding element. As illustrated in Figures 13 to 15, the tensioner (36) can be presented as a pair of parallel pulleys, separated from each other by a distance greater than the thickness of the cover (10) and less to the minimum diameter of the protruding element (12). Thus, when the cover is inserted into the tensioner, the cover can slide freely between the two pulleys, but the element protruding between the two pulleys cannot be removed. The two pulleys of each tensioner (36) are coupled to a corresponding frame, such that the axes of rotation of the tensioner pulleys are coaxial and generally oriented on a plane normal to the plane (X, Y) and parallel to the transverse axis ( Y) and is transverse, not normal to the (X,Y) plane. In general, the axes of rotation form an angle comprised between 20 and 70°, preferably between 30 and 60° with the plane (X,Y) (cf. Figure 14).

The insertion system can also comprise additional pulleys making it possible to best bring the projecting element (12) into position to be inserted into the opening (14) of the corresponding rail. For example, as illustrated in Figure 13, an alignment pulley (34) makes it possible to position the protruding element in alignment with the other elements of the insertion system and to orient the protruding element during its insertion. through the opening (14), as shown in Figures 2(c), 2(d), 3(c), 3(d), 8(b), 13-15. The insertion system may also include an alignment roller (38) which makes it possible to control the trajectory of the protruding element (12) to penetrate through the opening (14) into the space (14e) in the best conditions. An example is shown in Figure 13. The exact configuration of the insertion system depends on the type of protrusion (12), the geometry of the opening (14), as well as the tension required in the direction of the transverse axis (Y) on the cover when the two edges are inserted into the openings (14) of the respective rails.

SURFACE ELEMENTS (12)

[0070] The function of the projecting elements (12) is to allow the reversible engagement and locking of the longitudinal edges of the cover (10) in the opening (14) and the space (14e) of the rails (6) correspondents. The projecting element (12) can be in the form of a continuous bead (cf. Figures 8, 9 and 14) or of a helical spring (cf. Figure 10), extending along the lengths of the cover (10). Alternatively, the protruding element (12) can be formed from a succession of discrete elements (12d) aligned on each longitudinal edge of the cover (see Figure 11).

[0071] Locking is made possible by a locking system composed of the projecting element (12) and the opening (14) and space (14e) of the rails, the respective geometries of which allow the edges to be engaged and locked. longitudinal edges of the cover (10) in the opening (14) and space (14e) of the rails when the drum moves in the closing direction (Dc), and the unlocking and removal of the longitudinal edges of the cover (10) of the opening (14) and space (14e) of the rails when the drum moves in the opening direction (Do). A longitudinal edge of the cover is considered to be locked in the opening of a rail if it cannot come out of it by the sole action of a force (F) applied parallel to the transverse axis (Y) in the direction of the surface to be covered (see Figure 1).

[0072] A continuous bead preferably has a geometry characterized as follows, e in a section normal to each longitudinal edge of the cover, the corresponding projecting element (12) defines a convex geometry, in which a convex geometry is defined as a planar geometry defined by a closed perimeter that no straight line can cross more than twice e in a cross section, normal to the longitudinal axis (X), the opening (14) of the rail (6) has a maximum width (Lo), and the space (14e) has a maximum width (Le) greater than the maximum width (Lo) of the opening (14) (Lo < Le), where the maximum widths (Lo,

Le) are measured parallel to the transverse axis (Y), and, e the projecting element (12) of each longitudinal edge and the groove of the corresponding rail are configured so that when inserted into the space (14e) by the insertion pulley (32), the protruding element occupying the space (14e) alone cannot come out of it by the sole action of a force (F) applied parallel to the transverse axis (Y) in the direction of the surface to be covered.

[0073] Particular projecting element configurations are described below. The present invention is not restricted to these configurations alone, which are given by way of illustration.

Projecting elements = continuous bead characterized by D / d

In a variant of the invention, the projecting element (12) is formed by a continuous bead extending along the longitudinal edges of the cover. An example of a continuous bead is described in VVO2014064138. However, this bead requires the insertion of a strap in the space (14th) of the rail to lock the bead in the rail. It is preferred in the present invention that the bead be self-locking, in that it does not require external elements to be reversibly locked in the opening and space of the rail.

[0075] In the variant shown in Figures 8(a) to 8(d), the insertion system comprises an insertion pulley (32), as well as an alignment pulley (34) illustrated in

Figure 8(b), on which rests the inner surface of the cover. The combined actions of the insertion pulley (32) and the alignment pulley (34) make it possible to give a precise desired orientation to the projecting element. The alignment pulley (34) is also rotatably attached to the frame (23) and moves with it. The axis of rotation of the alignment pulley (34) is preferably normal to the longitudinal axis (X), in order to allow the pulley to "roll" on the inside surface of the cover as the carriage moves. and thus limit the wear of the cover by friction. The axis of rotation is also preferably transverse to the transverse axis (Y).

[0076] During the translation of the carriage in the closing direction (Dc) to deploy the cover on the surface (3), the insertion system comprising the insertion pulley (32) and, optionally, the pulley alignment (34) allows the protruding element to be inserted through the opening (14) by properly orienting the protruding element with respect to the opening (14) and introducing it into the space (14e) in which it is locked by relying on the internal walls of the space. During the translation of the carriage in the opening direction (Do) to collect the cover and remove it from the surface, the same insertion system allows the protruding element to be reoriented so that it can exit through the opening (14).

[0077] This variant playing on the length/width ratio (D/d) of the projecting element (12), in which the length (D) is the maximum dimension of the cross section of the projecting element (12 ) and the width (d) is the minimum dimension of the latter, is simple to implement and makes it possible to reversibly and reproducibly lock the longitudinal edges of the cover in the opening of the corresponding rails (6). The absence of moving parts (apart from the rotating pulleys) increases the durability of the locking system.

Projecting elements = continuous compressible bead

[0078] In an alternative variant illustrated in Figures 9(a) to 9(c), the projecting element (12) of each longitudinal edge is compressible such that it can pass from a resting configuration to a compressed configuration. As illustrated in Figure 9(a), in the rest configuration, the minimum diameter (d) of the protruding element is equal to dO which is between the maximum width (Lo) of the opening (14) and the maximum width (Le) of the space (14e) of the corresponding rail (Lo < d0 < Le). As illustrated in Figure 9(b), in its rest configuration, the protruding element (12) therefore cannot pass through the opening (14). In the compressed configuration, the minimum diameter (d) of the protruding element is equal to d1, which is less than or equal to the maximum width (Lo) of the opening (14) of the corresponding rail (d1 < Lo < d0 ), the protruding member can therefore pass through the opening in its compressed configuration (see Figure 9(b).

The insertion system makes it possible to compress the protruding element (12) in its compressed configuration when it is inserted through the opening (14) of the corresponding rail (6). As shown in Figures 9(a) and 9(b), the insertion system includes an insertion pulley (32) rotatably mounted about an axis parallel to the transverse axis (Y) on the frame ( 23) corresponding. The insertion pulley (32) is positioned in the axis of the opening (14), adjacent to, or even partially penetrating the opening (14) and moves with the drum (2). The insertion pulley (32) rests on the protruding element (12) of the cover and forces it to enter the opening (14). By the combined action of the insertion pulley (32) which presses the projecting element against the opening of the rail, and of releasing it (Lo) from the opening of the rail which is insufficient to allow a projecting element to pass diameter (d0 > Lo), the protruding element is compressed. Its diameter decreases until it becomes small enough to pass through the opening (14) when d1 = Lo, as shown in

Figure 9(b). Once the protruding element is in the space (14e), it recovers its rest configuration by resilience. The longitudinal edge of the cover is thus locked in the groove of the rail as shown in Figure 9(c).

[0080] The protruding element (12) can be removed from the space of the groove through the opening (14) by deforming it by applying a pulling force to the cover in a transverse direction, preferably substantially normal to the plane (X,Y) to take it out of the space (14e) by forcing its passage through the opening (14). By encountering the resistance offered by the opening of maximum width (Lo) to the passage of sections of the protruding element having a diameter greater than Lo, the protruding element is compressed until the diameter (d1) of said section is at most equal to Lo and can thus pass through the opening (14).

The application of the pulling force can be achieved by an alignment pulley (34) as discussed above in connection with Figure 8(b). Egress of the protruding element from the groove by compression can be facilitated by giving the protruding element a flared geometry at its point of attachment to the cover, as shown in Figure 9, i.e. not forming no acute angle with the cover.

[0081] The protruding compressible element (12) forms a convex bead which can be monolithic and full or, as shown in Figure 9, can have a core surrounded by an envelope. The core can be empty or filled with a different material than the shell.

The envelope can be formed from an extruded polymer, preferably an elastomer.

Alternatively, the envelope can be in the form of a fabric. In this case, the core is preferably not empty, but comprises an elastomer or a compressible foam.

Like the variant illustrated in Figure 8, this variant does not include moving parts and is simple to make. It makes it possible to reversibly and reproducibly lock the longitudinal edges of the cover in the space (14e) of the corresponding rails (6).

Projecting elements = coil spring

[0083] In a variant illustrated in Figures 10(a) to 10(e), the projecting element of each longitudinal edge is a cable in the form of consecutive turns forming a helical spring, the axis of which is parallel to the edge. corresponding longitudinal of the cover (10). The coils can change from a rest configuration to a deformed configuration. As shown in Figures 10(a), 10(c) and 10(d), in the rest configuration, the minimum diameter (d) measured parallel to the transverse axis (Y) of each turn at rest is equal to dO which is between the maximum width (Lo) of the opening (14) and the maximum width (Le) of the space (14e) of the corresponding rail (Lo < d0 < Le). In its rest configuration, a turn of the projecting element cannot pass through the opening (14) of the groove.

[0084] As illustrated in Figures 10(b) and 10(d), in the deformed configuration, the angle formed by the deformed turns with the longitudinal axis (X) is modified so that the minimum diameter (d1) measured in a plane normal to the longitudinal axis (X) of each deformed turn is less than or equal to the maximum width (Lo) of the opening (14) of the corresponding rail (d1<Lo<d0). This is illustrated by the top view of Figure 10(d) showing the middle turns being deformed by changing their orientation, so that the projection of the thus deformed turns onto a plane normal to the longitudinal axis (X) has a minimum diameter (d1) less than or equal to the width (Lo) of the rail opening. The coils in their deformed configuration can therefore penetrate through the opening (14) of the corresponding rail.

During the translation in the closing direction (Dc), the insertion system makes it possible to locally deform the turns in their deformed configuration during their insertion through the opening (14) of the corresponding rail (6). The insertion system can comprise an insertion pulley (32) which, as in the variants illustrated in Figures 8 and 9, can be mounted for rotation about an axis parallel to the transverse axis (Y) on the frame (23) matching. The insertion pulley (32) is positioned in the axis of the opening, adjacent to, or even partially penetrating the opening (14) of the rail and moves with the drum (2). The insertion pulley (32) presses on coils of the projecting element (12) of the cover deforming them into their deformed configuration and forces them to enter the opening (14). While the insertion pulleys (32) discussed in connection with the variants illustrated in the

Figures 8 and 9 preferably form a convex rounded rim in order to limit the wear of the projecting element of the cover on which it rests, the insertion pulley (32) to change the orientation of the turns until reaching the deformed configuration of the present variation, preferably has a beveled rim as shown in Figures 10(a) and 10(b).

The sharp edge formed by the beveled rim of the insertion pulley (32) penetrates between the turns and deforms them by turning them on an axis normal to the plane (X, Y). As shown in

Figure 10(d) the turns thus deformed can enter the space (14e) of the groove through the opening (14). Figure 10(e) shows a side view of the introduction turn by turn of the helical spring into the space (14e) of a rail (6).

[0086] Once they are in the space (14e) the turns recover their rest configuration and the corresponding minimum diameter (d0), which does not allow the turns to pass through the opening (14). The longitudinal edges of the cover are thus locked in the corresponding rails.

[0087] Unlocking is done in the same way. During the translation of the drum in the direction of opening (Do) to recover and roll up the cover on the axle (2nd) of the drum, the insertion pulley (32) penetrates between the turns housed in the space (14th ) and rotate them into the distorted configuration. The traction applied to the cover by the rotating drum is sufficient to remove the deformed coils through the opening (14) and thus gradually free the longitudinal edges of the cover from the corresponding rails.

The cable in the form of consecutive turns forming a helical spring can be made of different materials. For example, the cable can be made of metal, such as stainless steel, or an aluminum alloy. The metal and, in particular, the steel is preferably hardened or in any case sufficiently rigid not to be plastically deformed at the slightest stress, by stepping on it or the like. Once plastically deformed, the coils can no longer be used to properly lock the longitudinal edges of the cover. The cable can be made of polymer or polymer reinforced with reinforcing fibers, such as glass fibers, carbon fibers, natural fibers or aramid fibers (e.g., Kevlar®, Twaron®).

Projecting elements = discrete hooks

[0089] In a variant, illustrated in Figures 11(a) to 11(c), the locking element comprises a wing (6a) partially closing the side of the opening (14) of each adjacent rail (6) on the surface to be covered. The protruding element (12) is formed from a succession of discrete elements (12d). These form hooks preferably having an “L” or, preferably “j” profile (with a return at the bottom of the “j”). The profile comprises a portion continuously aligned with the surface of the cover and fixed to the corresponding longitudinal edge of the cover, and a transverse portion forming the hook, extending transversely with respect to the aligned portion.

The hook is configured to hook onto the wing (6a) of the corresponding rail once the transverse tension applied to the cover by the insertion system is released.

In the case where the transverse portion of the discrete elements (12d) forming the hook comprises a reference, as illustrated in Figures 11(a) to 11(c), the locking is ensured. In the case of an "L" profile, the angle between the aligned portion and the transverse portion may be slightly less than 90° in order to ensure anchoring with the rail.

OPENING AND CLOSING OF THE SURFACE

[0091] As illustrated in Figures 2, 3 and 5 to 7, the translation of the drum requires activating the rotation of the axle (2nd) of the drum (2) to move the drum in the opening direction (Do) in allowing the closing axle (1) to rotate freely, in order to remove the cover from the surface. The activation of the rotation of the closing axle (1) is necessary to move the drum in the closing direction (Dc) allowing the free rotation of

Drum axle (2nd) to deploy the cover on the surface. The rotation means (M1, M2) of the drum (2nd) and closing (1) axles are preferably electric motors. They can however be manual means comprising for example a crank. In Figures 5 to 7, when a rotation means (M1, M2) is activated, it is shown with a lightning bolt next to it. Figures 5 to 7 represent three variants discussed above. e Figure 5 shows the variant in which the closing axle (1) is mounted on the frames (23) downstream of the drum (2); the projecting elements (12) are introduced into the opening of the rails downstream of the drum (2), which rolls over a portion of cover already deployed downstream of the drum. e Figure 6 shows the variant in which the closing axle (1) is mounted on the first longitudinal edge of the surface (inserted in a channel below the level of the edges adjacent to the surface; the protruding elements (12) are introduced into the opening of the rails downstream of the drum (2), which rolls on a portion of cover already deployed downstream of the drum e Figure 7 shows the variant in which the closing axle (1) is mounted on the frames (23) downstream of the drum (2); the projecting elements (12) are introduced into the opening of the rails upstream of the drum (2), which rolls on the rails, deploying the cover upstream of the drum.

[0092] The variant in which the closing axle (1) is inserted inside the drum axle (2e), discussed above in relation to Figure 4(c), is not shown because the principle of operation is equivalent to that of the variants shown in Figures 5 and 7.

[0093] Figures 5(a), 6(a) and 7(a) show the cover (10) completely rolled up on the drum (2), exposing the surface (3), represented by the cavity of a swimming pool. The drum (2) is stationary, parked at the level of the second width of the surface.

In order to cover the surface (3), the drum (2) must be moved in the closing direction (Dc) as shown in Figures 5(b), 6(b) and 7(b). The first rotation means (M1) is activated (cf. flashes next to the motor (M1) in Figures 5(b), 6(b) and 7(b)). The rotation of the closing axle (1) wraps the first and second traction cords (21) around it causing the translation of the drum (2) in the closing direction (Dc).

As the drum moves away from the second width of the surface, where the second transverse edge of the cover is fixed, the cover upstream of the drum stretches and creates a pulling force spontaneously activating the rotation of the drum which is free in this direction of rotation and thus unrolls the cover (10) as the drum moves in the closing direction (Dc). In Figures 5 and 7, the closing axle (1) is mounted on the frames (23) and the fixed ends (21f) of the tensile cords (21) are fixed to the corners of the surface at the level of the first width of it. In Figure 6 the fixed ends (21f) of the pull cords (21) are fixed to the frames (23) and the closing axle is at the level of the first width. The effect of the rotation of the closing axle (1) is the same in all variants, since a pulling force is created on the pull cords which causes the drum to move in the closing direction. The free rotation of the drum allows the cover to unroll.

[0095] Figures 5(c), 6(c) and 7(c) show the cover (10) entirely unrolled from the drum (2), covering the surface (3). The drum (2) is stationary, parked at the level of the first width of the surface (on the opposite side of the second width).

In order to uncover the surface (3), the drum (2) must be moved in the opening direction (Do) as shown in Figures 5(d), 6(d) and 7(d). The second rotation means (M2) is activated (cf. flashes next to the motor (M2) in Figures 5(d), 6(d) and 7(d)). The rotation of

The axle (2nd) of the drum causes the cover to wrap around the axle (2nd) which creates traction on the cover, the second transverse edge of which is fixed to the second width.

The drum is therefore pulled in the direction of opening (Do) as the cover wraps around the axle (2e). The closing axle (1) turns freely in this direction of rotation and unwinds the pull cords (21) which fit into the openings (14) of the rails as the drum moves.

[0097] As illustrated in Figures 2, 3, 12, 13 and 15, the device may comprise at least first and second anti-lift guides (25) comprising an external portion coupled to the corresponding first and second frame and an internal portion inserted in the corresponding rail space, so as to be able to slide freely along the rails parallel to the longitudinal axis (X) and not being able to be extracted from the rails (14) by the application of a force perpendicular to the longitudinal axis (X). In order to reduce the friction during the translation of the anti-lifting guides on the rails, the guides can comprise rollers (25r) making it possible to roll on the rails. As shown in Figure 12, the rollers may rest on outer surfaces of the rails. In an alternative variant, the rollers can be in the space (14th) of the rails. Anti-lift guides are useful if the plane (X,Y) is not horizontal, or even is substantially vertical. But they are also useful in the case where the plane (X,Y) is horizontal because if the wind rushes under the cover during the translation of the drum, it can lift the drum and misalign the device.

CONCLUDING REMARKS

The use of two motors (M1, M2) seems intuitively more restrictive than the use of a single motor as described in WO2010054960. In reality this is not the case. A motor is inexpensive and can be inserted inside the closing axles (1) and drum (2e) taking up no additional space. The use of two motors (M1,

M2) makes it possible to do without a torsion spring which is essential in the case of a single motor to activate the rotation of the drum and the unwinding of the cover during the deployment of the cover as the drum moves in the closing direction (Dc). The torsion spring has some disadvantages. On the one hand, the torsion spring significantly increases the work of the motor when removing the cover, since the motor not only has to move the drum and roll up the cover, but also tension the torsion spring. On the other hand, the assembly and adjustment of the torsion spring requires some experience and cannot be carried out for the first time by the purchaser of a covering device.

The device of the present invention can therefore use less powerful motors than in the case of a system with a torsion spring. Such a device has fewer moving parts and is therefore cheaper. It is also easier to install and one can imagine a user installing the device himself. At the same time with the insertion system allowing the locking of the longitudinal edges in the openings of the rails, without the use to carry out the locking of moving parts or third components, such as flexible belts inserting in the opening of the rails, the device of the present invention offers a simple and robust solution for covering and uncovering a surface with securing of the cover on its four sides, which is advantageous and, in certain countries, legally binding in the case of swimming pools.

REF |CHARACTERISTIC - —_ ÿ . 6|Rai 6a | Finnedderal © ___d | Minimum diameter of protruding element (measured normal to longitudinal edge) ee ere eo ounce IT longitudinal edge) normal to longitudinal edge) ___D | Maximum diameter of the protruding element ___R | Drum radius (varies depending on the portion of cover wrapped around the axle (2nd)

Claims (14)

1. Device (1) for covering a surface (3) comprised in a rectangle comprising first and second lengths extending parallel to a longitudinal axis (X) and first and second widths extending parallel to a transverse axis (Y ), normal to the longitudinal axis (X), and defining therewith a plane (X, Y), the device comprising: (a) a substantially rectangular covering (10) of dimensions equal to those of the rectangle and having first and second longitudinal edges opposite each other and first and second transverse edges opposite each other, the second transverse edge (10f) being fixed to the second width of the rectangle in which the surface (3 ) and each longitudinal edge being provided with a projecting element (12) extending along the corresponding longitudinal edge defining a profile in section normal to the corresponding longitudinal edge having a minimum diameter (d), (b) two rails (6 ) placed on either side of said surface (3) parallel es to the longitudinal axis (X), each rail consisting of a profile having an opening (14) on one of its faces and oriented opposite the surface to be covered, the opening giving access to a space ( 14e) in the rail defining with the opening a groove extending all along each rail, (C) a drum (2) formed of an axle (2e) and at least a portion of the cover (10 ) which is at least partially wrapped around the axle and whose first transverse edge is fixed to the axle, in which, e the drum (2) extends above the surface parallel to the transverse axis ( M), in which the axle (2e) is mounted at each of a first and second ends on the first and second frame (23), on the one hand, rotatably allowing the cover (10) to be rolled up and unrolled and , on the other hand, in translation allowing a translation of the drum parallel to the longitudinal axis (X) along the two rails (6), on the one hand, in a closing direction (Dc) and, on the other hand , d n an opening direction (Do), the axle (2e) is provided with a second rotation means (M2) allowing the drum to be rotated in one direction to roll up the cover (10) on the drum and at the same time cause the longitudinal translation of the drum in the direction of opening (Do) causing the removal of the cover from the surface (3), e an insertion system adjacent to the drum (2) on each of the first and second frames (23 ) on each side of the surface to be covered and making it possible to guide, position and insert the projecting element (12) of each longitudinal edge of the cover into the space (14e) through the opening (14) of the rail ( 6) corresponding during the translation in the closing direction (Dc) of the drum, the insertion system comprising a cover insertion pulley (32) in which the projecting element (12) of each longitudinal edge and the groove of the corresponding rails are configured so that once inserted into the space (14th) by the insertion system, the protruding element occupying the space alone (14th); e cannot come out of it by the sole action of a force (F) applied parallel to the transverse axis (Y) in the direction of the surface to be covered, and e can come out of it when rolling up the cover (10 ) on the drum (2) moving in the direction of opening (Do) causing the removal of the cover, characterized in that the drum (2) is mounted in translation allowing a translation also according to a component perpendicular to the plane (X, Y) so that the drum rests permanently, e either on a cover portion between the second transverse edge (10f) and the cover insertion pulley (32) of the insertion system provided downstream of the drum (2), for any value of a radius (R) of the drum which depends on the length of cover wound on the axle (2e) of the drum, e either on the rails or on the surfaces adjacent to the rails comprised between each rail and the surface, downstream of the cover insertion pulley (32) of the insertion system, in which the term "downstream" is defined relative to the direction of closure (Dc), and in that, the device comprises, first and second pull cords (21), each comprising a movable end (21m) coupled to move with the first and second frames (23) and a fixed end (21f) coupled to first and second corners of the surface, respectively, so as to remain substantially stationary in the direction of the longitudinal axis (X), the first and second corners being defined by the intersection between the first width of the surface and the first and second lengths, respectively, and e a closing axle (1) extending parallel to the transverse axis (Y) and comprising first and second ends each fixed in rotation allowing the winding and unwinding of the first and second traction cords (21), the axle of closure (1) being provided with a first axle rotation means (M1) for rotating the closing axle in one direction to wind the first and second pull cords (21) on the closing axle (1) and at the same time driving the longitudinal translation of the frames (23) and the drum (2) along the two rails in the closing direction (Dc), causing the rotation of the drum (2) and the deployment of the cover on the surface (3). 2. Device according to claim 1, in which, e the fixed end (21f) of each pull cord (21) is coupled to the corresponding first or second corner of the surface, e the movable end (21m) of each pull cord (21 ) is coupled to the closing axle (1) and the closing axle (1) is coupled to the first and second frames (23) downstream of the drum (2). 3. Device according to claim 1, in which, e fixed end (21f) of each pull cord (21) is coupled to the corresponding first or second corner of the surface, e movable end (21m) of each pull cord (23 ) is coupled to the closing axle (1) and the closing axle (1) is coupled to the first and second frames (23) and is positioned inside the and coaxially with the axle (2e) of the drum (2). 4. Device according to Claim 1, in which, e the closing axle (1) is positioned at the level of the first width of the surface, e the fixed end (21f) of each pull cord (21) is coupled to the closing axle (1) at the corresponding first or second corner of the surface, and the movable end (21m) of each pull cord (21) is fixed to the corresponding frame (23). 5. Device according to any one of the preceding claims, comprising first and second return pulleys (31) provided on the first and second frame (23) on each side of the surface to be covered, making it possible to guide, position and insert the cord of traction (21) corresponding in the space (14e) through the opening (14) of the rail (6) corresponding during the translation in the direction of opening (Do) of the drum. 6. Device according to any one of the preceding claims, in which the drum (2) is mounted on each of the first and second frames (23) via either e a lever arm (2L) comprising a first end coupled to a respective frame, and a second end rotatably coupled to the drum, the lever arms being configured to pivot relative to the respective frames about an axis parallel to the transverse axis (Y), i.e. e of one guide (2r) extending along at least one component normal to the plane (X,Y), the rotation of the lever arm (2L) or the guide (2r) allowing the first and second ends of the drum to rest permanently on the rails or on the surfaces adjacent to the rails between each rail and the surface, including during movement of the drum (2) in the opening (Do) and closing (Dc) directions. 7. Device according to any one of the preceding claims, in which the first rotation means (M1) and the second rotation means (M2) comprise a motor or a crank. 8. Device according to any one of the preceding claims, in which, e in a section normal to each longitudinal edge of the cover, the corresponding projecting element (12) defines a generally convex geometry, e in a cross section, normal at the longitudinal axis (X), the opening (14) of the groove has a maximum width (Lo), and the space (14e) has a maximum width (Le) greater than the maximum width (Lo) of the opening (14) (Lo < Le), where the maximum widths (Lo, Le) are measured parallel to the transverse axis (Y), and, e the projecting element (12) of each longitudinal edge and the groove of the corresponding rail are configured so that once inserted into the space (14e) by the cover insertion pulley (32), the protruding element occupying the space alone (14e) cannot come out of it by the only action of a force (F) applied parallel to the transverse axis (Y) in the direction of the surface to be covered. 9. Device according to claim 8, in which, e the minimum diameter (d) of the protruding element is less than the maximum width (Lo) of the opening (14) (d <Lo), e [element in projection has a maximum diameter (D) greater than the maximum width (Lo) of the opening (14) (Lo < D), and in which the cover insertion pulley (32) is configured to orient the element projecting (12) through the opening (14) of the corresponding rail having a diameter between d and D and less than Lo, the projecting element changing orientation once the projecting element is in the space (14th). 10. Device according to claim 8, in which the projecting element of each longitudinal edge is compressible such that, e in a rest configuration, the minimum diameter (d) is equal to dO which is between the maximum widths (Lo, Le) of the opening (14) and the space (14e) of the corresponding rail (i.e., Lo < d0 < Le), and e in a compressed configuration, the minimum diameter is equal to d1, which is less than or equal to the maximum width (Lo) of the opening (14) of the corresponding rail (ie. d1 < Lo ), and wherein the cover insertion pulley (32) allows the protrusion (12) to be compressed into its compressed configuration when inserted through the opening (14) of the corresponding rail (6), the the protrusion (12) recovering its alignment configuration once the protrusion is in the space (14e). 11. Device according to claim 8, in which the projecting element (12) of each longitudinal edge is a cable in the form of consecutive turns forming a helical spring, the axis of which is parallel to the corresponding longitudinal edge of the cover (10 ), in which the turns are defined such that, e in a configuration at rest, the minimum diameter (d) measured parallel to the transverse axis (Y) of each turn at rest is equal to dO which is between the maximum widths (Lo, Le) of the opening (14) and of the space (14e) of the corresponding rail (Lo < d0 < Le), and e in a deformed configuration, the angle formed by the deformed turns with the axis longitudinal (X) is modified so that the minimum diameter (d) measured in a plane normal to the longitudinal axis (X) of each deformed turn is equal to d1 which is less than or equal to the maximum width (Lo) of the opening (14) of the corresponding rail (d1 < Lo), and in which the insertion system makes it possible to deform local ment of the turns in their deformed configuration during their insertion through the opening (14) of the corresponding rail (6), the turns recovering their configuration of rest once they are in the space (14e). 12. Device according to any one of claims 1 to 7, wherein the projecting element (12) of each longitudinal edge comprises a plurality of hooks placed side by side and having an "L" or "j" profile. , having e a portion continuously aligned with the surface of the cover and fixed to the corresponding longitudinal edge of the cover, and e a transverse portion forming the hook, extending transversely with respect to the aligned portion, and in which each rail comprises a wing (6a) partially closing the side of the opening (14) of each rail (6) adjacent to the surface to be covered and capable of receiving the transverse portion of the hooks. 13. Device according to any one of the preceding claims, comprising at least first and second anti-lifting guides (25) comprising an external portion coupled to the corresponding first and second frame and an internal portion coupled to the corresponding rail, so as to be able to slide freely along the rails parallel to the longitudinal axis (X) and cannot be extracted from the rails (14) by the application of a force perpendicular to the longitudinal axis (X). 14. Use of a device according to any one of the preceding claims to cover a surface (3) selected from: e a basin whether or not filled with a liquid; or e a sports field, or e a vehicle body, or e a glazed surface; e an opening in a wall.