EP4151287B1 - Interface device between a trampoline and a reception pit - Google Patents

Description

The present invention relates to the field of sports equipment, in particular trampolines, and more particularly trampolines used for training in the performance of acrobatic figures and landing on a suitable landing area.

For training in sports gymnastics and in order to perform perilous figures, gymnasts commonly use a trampoline embedded in the floor of a gymnasium, that is to say stretched substantially at the level of the floor of the gymnasium above a trampoline pit formed in the ground, and a landing area adjacent to the trampoline.

In particular, the gymnasts jump on the trampoline, perform the desired figure and land further, outside the trampoline, on a flexible and cushioning area called a landing pit. By “gymnast” we generally mean throughout this document any user of the trampoline, male or female, of any age category.

At the interface between the trampoline and the landing pit, different devices have been considered. The device located at the interface between the trampoline and the receiving pit must be adapted to fixing the springs of the trampoline on the one hand, and to receiving (and generally fixing) flexible elements of the pit on the other hand. The interface device can thus include a low wall, a rigid and fixed bar, or a suitable mechanical device.

If a low wall or fixed bar is used, the device constitutes a blunt element in the event of the gymnast falling at the interface between the trampoline and the landing pit. Even by covering this rigid device with a shock-absorbing material, a fall on the interface device can be painful or even dangerous.

In response to this problem, it was envisaged to create an interface formed of a flexible element such as a chain or a bungee cord (registered name), which brings a little flexibility to the interface. But the trampoline then loses part of its rebound qualities near the interface with the landing pit, and no longer offers a predictable and relatively uniform dynamic response over its entire surface.

The document FR2844206 proposes, in response to this problem, an interface between a trampoline and a landing pit comprising a rigid bar, to which the springs of the trampoline are fixed in a conventional manner on one side, and on the other side the tension elements ( springs, tensioners, ropes, etc.) from the receiving pit. According to FR2844206 , the rigid bar is mounted on a vertical telescopic leg which rests on the bottom of the trampoline pit, that is to say on the bottom of the space located under the trampoline (which generally also corresponds to the bottom of the reception pit, these two volumes can be formed in one piece). This telescopic leg is equipped with a spring exerting sufficient force to maintain the bar in the desired vertical position, but which compresses in the event of a violent impact on the bar, corresponding for example to the fall of a gymnast. The bar can thus sink towards the ground, and the spring then absorbs a significant part of the energy transmitted to the rigid bar during impact. In order to prevent the bar from lowering each time a gymnast bounces on the trampoline, a locking system is activated by the additional horizontal force exerted by the springs of the trampoline on the bar when they are tensioned by an impact on the trampoline canvas. When the locking system locks the telescopic leg, the rigid bar remains in place in the vertical direction, ensuring smooth response of the trampoline. Finally, the rigid bar is stabilized in the other directions by a system of stays (ropes, chains, etc.) between the bar and the bottom or the walls of the space located under the trampoline, so that if the gymnast falls towards one end of the bar, the central telescopic leg fulfills its function correctly. The system of FR2844206 thus fulfills the desired protective function very satisfactorily. This system is nevertheless complex to implement for several reasons. Firstly, to the extent that the telescopic leg rests on the bottom of the space located under the trampoline, the system must be adapted to each particular application, depending on the depth of the pit. The same goes for bracing the bar. In addition, the very configuration of the guying depends on the geometry of the pit where the system is installed, which makes this installation complex.

The present invention aims to propose an interface device between a trampoline and a receiving pit, which guarantees the safety of users while being simple to install and implement.

• un premier support et un deuxième support destinés à être fixés respectivement sur des parois latérales opposées d'une fosse de trampoline ;
• un premier bras monté pivotant sur le premier support et un deuxième bras monté pivotant sur le deuxième support, le premier bras et le deuxième bras pivotant autour d'un même axe de rotation transversal,
• une barre rigide transversale liée à une extrémité du premier bras et à une extrémité du deuxième bras, de sorte qu'elle peut basculer autour de l'axe de rotation des premier bras et deuxième bras entre une position initiale et une position escamotée, ladite barre rigide transversale étant adaptée à l'accrochage du trampoline.

Thus, the invention relates to an interface device between a trampoline and a receiving pit adjacent to the trampoline. The interface device includes:

• a first support and a second support intended to be fixed respectively on opposite side walls of a trampoline pit;
• a first arm pivotally mounted on the first support and a second arm pivotally mounted on the second support, the first arm and the second arm pivoting around the same transverse axis of rotation,
• a rigid transverse bar linked to one end of the first arm and to one end of the second arm, so that it can tilt around the axis of rotation of the first arm and second arm between an initial position and a retracted position, said bar transverse rigid being adapted to the attachment of the trampoline.

By using a rigid tilting bar, the device offers simple and effective kinematics for retracting the bar. In addition, no support point at the bottom of the trampoline pit or the landing pit is necessary, which makes the device simple to install, in particular in that no adaptation of the device to the depth of the pit No trampoline is necessary.

Each support may include a high stop on which the arm linked to the support rests when the rigid transverse bar is in the initial position. Likewise, each support may include a lower stop on which the arm linked to the support rests when the rigid transverse bar is in the retracted position.

The upper stop limits the movement of each arm of the device and maintains the rigid transverse bar at the desired level. In particular, it can serve or participate in the recovery of the traction forces exerted by the springs of the trampoline on the rigid bar, when the trampoline is not used and during the impact of a gymnast on the trampoline. By ensuring that the rigid transverse bar remains fixed despite the gymnast's impacts on the trampoline mat, it ensures that the dynamic response of the trampoline is not affected by the interface device. The upper stop can advantageously be made of an elastic material, for example an elastomer, and can in particular consist of a rubber or silicone pad.

The lower stop limits the tilting movement of the rigid transverse bar when it retracts under the effect of the impact of a gymnast who falls on it. This allows the rigid transverse bar to spontaneously return to its initial position, under the force exerted by the springs of the trampoline on the rigid bar, when the vertical force which caused the tilting of the rigid transverse bar ceases. Stop low is advantageously made of an elastic material, for example elastomer, and can in particular consist of a rubber or silicone pad. When the rigid transverse bar is retracted, the energy of the impact is thus first dissipated in part by the elongation of the trampoline springs, then, once the lower stop is reached, by the deformation of the latter. .

The device may further comprise a damping cylinder, a first end of which is linked to the first arm or the second arm, near its end linked to the rigid transverse bar, and a second end of which is linked to the support to which said arm is mounted.

Each support of the device may in particular comprise a main plate and an elongated extension portion to which the second end of the damping cylinder is connected, said elongated portion being rigidly fixed to the main plate.

The device advantageously comprises two damping cylinders, respectively linked to the first arm and to the second arm.

The spring, gas or liquid actuator(s) makes it possible to gradually and effectively dissipate the energy of the impact of a gymnast on the rigid transverse bar when it retracts. The cylinder can be in the form of a telescopic leg. It is also remarkable that, the jack being fixed to the support and not to the floor of the trampoline pit as is the case in the prior art, the implementation of the device is very simple and in particular does not require any adaptation from the dimensions of the device to the depth of the trampoline pit.

Each support may have an elongated shape defining a main direction corresponding to the vertical when the support is fixed in a trampoline pit, in which the first arm and the second arm form an angle of between 30° and 85°, preferably of of the order of 45°, with respect to the main direction when the rigid transverse bar is in the initial position.

The initial orientation of the arms allows the operation of the device. Indeed, thanks to the horizontal offset of the rigid transverse bar with respect to the axis of rotation of the arms of the device (linked to the orientation of the arms and their length), a torque causing the tilting of the arms and of the rigid transverse bar around this axis of rotation is created during the impact of a gymnast on the rigid transverse bar.

The rigid transverse bar may comprise a first element linked to the first arm, a second element linked to the second arm, and a central element engaged on the first element and on the second element.

This allows the width of the device to be adjusted, allowing the length of the rigid transverse bar to be adapted. This can also make it possible to have a reversible central element. A reversible central element can for example present on opposite sides hooking means adapted to different types of trampolines. The invention also relates to an assembly comprising a trampoline pit and a landing pit adjacent to the trampoline pit, an interface device between a trampoline and a landing pit as described above, and a trampoline stretched to the -above said trampoline pit and attached to the rigid transverse bar of the interface device.

A net can be linked to the rigid transverse bar of the interface device.

Alternatively or in addition, a flexible tension element such as a rope, a strap or a chain can connect the rigid transverse bar of the device to a bottom of the trampoline pit or the landing pit.

The device proposed in the invention thus makes it possible to secure the interface zone between the trampoline and the receiving pit. In order to contribute to the balance of forces in the device in its initial position (in the absence of impact on the rigid transverse bar) and limit, if necessary, the forces on the upper stop and more generally on the support of the device in this initial position, different devices are possible depending on the configuration of the reception pit. If the receiving pit is equipped with a net, this net (and/or any other flexible tension element, rope, spring, chain, etc.) can take up all or part of the horizontal traction forces exerted on the rigid bar transversal by the trampoline springs. In the case where the reception pit is not equipped with a reception net, in particular if the reception pit is full, for example if it is filled with foam blocks, ropes or other guy wires tied to the bottom of the trampoline pit or at the bottom of the landing pit can allow this recovery of efforts. The stay being a flexible element, its length is very easily adaptable to the depth of the receiving pit.

Other features and advantages of the invention will appear in the description below.

• la figure 1 représente, selon une vue schématique en trois dimensions, un exemple de trampoline et de fosse de réception adjacente ;
• la figure 2 représente, selon une vue schématique partielle, un dispositif d'interface entre un trampoline et une fosse de réception conforme à un mode de réalisation de l'invention, dans une position d'origine ;
• la figure 3 représente, selon une vue schématique en trois dimensions, le dispositif de la figure 2 ;
• la figure 4 représente, selon une vue schématique, le dispositif des figures 2 et 3 dans une position escamotée.

In the appended drawings, given as non-limiting examples:

• there figure 1 represents, in a schematic three-dimensional view, an example of a trampoline and adjacent landing pit;
• there Figure 2 represents, in a partial schematic view, an interface device between a trampoline and a receiving pit according to one embodiment of the invention, in an original position;
• there Figure 3 represents, in a schematic three-dimensional view, the device of the Figure 2 ;
• there Figure 4 represents, in a schematic view, the device of the figure 2 And 3 in a retracted position.

There figure 1 represents a trampoline 1, the canvas 2 of which is stretched above a trampoline pit 3 provided in the floor 4, for example in the floor 4 of a gymnasium. The canvas 2 of the trampoline 1 is thus substantially at ground level 4. The trampoline shown has a rectangular shape and is linked on three of its sides to the edges of the trampoline pit 3 by springs 5 which put the canvas 2 in tension. On these three sides of the trampoline 1, the springs 5 are covered by mattresses 6 ensuring the protection of the gymnasts in the unlikely event of a fall at this level.

A receiving pit 7 is provided in the ground 4, next to the trampoline pit 3, that is to say adjacent to the trampoline 1. On this side of the trampoline 1 which is interfaced with the receiving pit 7, the canvas 2 cannot be linked to a bank of the trampoline pit 3.

The receiving pit 7 is intended to allow the reception, without risk of injury, of a gymnast. To this end, a net (not shown) is stretched above the receiving pit 7, and/or flexible elements such as foam blocks are installed in the receiving pit 7. The net is generally stretched at the level from the ground or slightly below (the net can for example be installed between ground level and 30 cm below the ground) and it can be covered with a mattress, for example around twenty centimeters thick.

There are also so-called “full” reception pits which are filled with foam, as well as “cube” pits: these reception pits are completely filled with foam elements, for example foam cubes. In order to contain the foam elements, so that they remain in the receiving pit, and do not enter the trampoline pit, a net is placed vertically, perpendicular to the end of the trampoline, and fixed to the ground.

This type of installation is thus used by gymnasts to train to perform aerial acrobatics, and in particular for training on exits from programs carried out on different artistic gymnastics apparatus. To do this, the gymnast jumps on trampoline 1 to reach the desired height then performs his figure by jumping from the trampoline 1 towards the landing pit 7. It is in particular during this movement that a fall of the gymnast at the level of the interface zone 8 enters the trampoline and the landing pit 7 can occur.

It is therefore appropriate to install at this interface 8 a device allowing both to fix the springs of the trampoline, without affecting the dynamic response of the trampoline during its use, and to protect the gymnast in the event of a fall at the level of the trampoline. interface 8.

There figure 2 and the Figure 3 represent an interface device between a trampoline and a receiving pit according to one embodiment of the invention, in an original position. The so-called original position corresponds to the position of the device installed at the interface between a trampoline 1 and a receiving pit 7, when the trampoline is not used. As explained below, the device also maintains this original position when the trampoline 1 is used by a gymnast, and is only mobilized towards a so-called retracted position in the event of application of sufficient vertical force. (for example caused by the impact of a gymnast) on the device. The absence of influence of the jumps performed by the gymnast on the position of the device guarantees a predictable and uniform rebound of the trampoline 1 over the entire surface of its canvas 2.

There figure 2 is a partial view of the device which allows us to understand its kinematics while the Figure 3 is a complete three-dimensional view that allows you to better understand the general configuration of the device.

The interface device between a trampoline and a receiving pit adjacent to the trampoline comprises a first support 9 and a second support 10. The first support 9 and the second support 10 are intended to be fixed respectively on opposite side walls 11, 12 of the trampoline pit, in the immediate vicinity of interface 8 between trampoline pit 3 and landing pit 7.

Each support 9, 10 can have the shape of an angle to allow reliable fixing on the internal wall of the trampoline pit 3 as well as on its edge.

The device comprises a first arm 13 which is pivotally linked to the first support 9.

The device comprises a second arm 14 which is pivotally linked to the second support 10.

The first arm and the second arm can thus pivot around the same axis of rotation (A), which is called transverse.

The device also includes a rigid transverse bar 15.

When the device is installed at the interface between a trampoline pit 3 and a receiving pit 7, the transverse direction corresponds to the direction, substantially horizontal, of the right edge of the trampoline pit 3 located at the interface. A rigid transverse bar 15 is rigidly linked to one end of the first arm which is opposite its pivot point with respect to the first support 9.

The rigid transverse bar 15 is also rigidly linked to one end of the second arm 14 which is opposite its pivot point with respect to the second support 10.

In the example shown, and to facilitate transport, installation, and more generally the implementation of the device, the rigid transverse bar is made up of several parts, namely a first element 16 rigidly linked (for example welded) to the first arm 13, a second element 17 rigidly linked (for example welded) to the second arm 14, and a central element 18. The central element 18, which here has the shape of a square section profile, is engaged, fitted, on the first element 16 and on the second element 17. The central element is immobilized vis-à-vis the first element 18 and the second element 17, for example by screwing.

This constitution also allows adjustment of the width (dimension in the transverse direction) of the device. This makes it possible to adapt the device to many pits despite sometimes significant dimensional tolerances in their width. This also allows the same device to be compatible with trampolines of various sizes. In particular, the same device can be used with a small trampoline, commonly called a “Master” trampoline (having a canvas of approximately 366 cm by 183 cm), and with a large trampoline, commonly called a “Grand Master” trampoline ( having a canvas of approximately 426 cm by 213 cm). The rigid transverse bar 15 comprises, in the example shown, attachment means 19 for the springs of the trampoline. The hooking means 19 can be formed from a set of hooks or rings, or, in known manner, from a corrugated rod (called "onduline") fixed to the rigid transverse bar 15 so as to form a set rings along said rigid transverse bar 15. The central element 18 of the rigid transverse bar 15 can have ondulins on two opposite sides and be reversible. This makes it possible, for example, to provide ondulins having a different pitch (number of undulations per linear meter) on each side. Thus, the ondulines present on one side of the rigid transverse bar 15 can be adapted, by the spacing of the rings created, to fixing the springs of a “Master” trampoline, while the ondulines present on the other side of the rigid transverse bar 15 are suitable for fixing the springs of a “Grand Master” trampoline.

The rigid bar 15 also includes fixing means 20 suitable for fixing a net 21 stretched above the receiving pit 7, or, where appropriate, a stay 22 (or other tensioning element) intended to be fixed to the bottom of the trampoline pit 3 or the landing pit. The fixing means 20 can be formed, where appropriate, by the ondulins present on the rigid transverse bar 15 which are not used for fixing the trampoline springs (for example on the side of the reversible central element 18 opposite the side containing the ondulins used for fixing the trampoline canvas). The stay (or other tension element) can be used to properly maintain flexible elements such as foam blocks which are contained in the reception pit 7.

The supports 9, 10 have an elongated shape which defines a main direction (D) which also corresponds to the vertical when the device is installed.

In the initial position, the first arm 13 and the second arm 14 extend perpendicular to the rigid transverse bar 15 and form a non-zero angle α with respect to the main direction (D), so that the rigid bar transverse is not vertically aligned with the axis of rotation (A) of the first arm 13 and the second arm 14. Thus, when a vertical force is applied to the rigid transverse bar 15, a torque is created tending to tilt the rigid transverse bar 15. More particularly, an angle α of between 30° and 90°. An angle preferably of the order of 45° can be applied. Indeed, a small angle limits the effectiveness of the protection offered by the system, while too large an angle can lead to a certain instability of the device when the gymnast uses the trampoline.

• la force de traction horizontale exercée par les ressorts du trampoline sur la barre rigide transversale 15, au niveau des moyens d'accrochage 19. Cette force de traction entraîne un couple de rappel plus ou moins important selon l'angle α et la longueur du premier bras et du deuxième bras, qui tend à maintenir la barre rigide transversale 15 et le système dans la position initiale ;
• la force générée par la butée haute 23 sur le bras correspondant, qui équilibre ou participe à équilibrer la force de traction horizontale exercée par les ressorts du trampoline ;
• le cas échéant, la force horizontale exercée par le filet 21 de la fosse de réception 7 sur la barre rigide transversale au niveau des moyens de fixation 20, et qui s'oppose à la force de traction horizontale exercée par les ressorts du trampoline sur la barre rigide transversale 15 ;
• le cas échéant, la force exercée par le hauban 22 qui peut relier la barre rigide transversale 15 au fond de la fosse de trampoline ou de la fosse de réception 7, et qui crée dans le premier bras 13 et dans le deuxième bras 14 un couple opposé au couple général par la force de traction horizontale exercée par les ressorts du trampoline sur la barre rigide transversale 15. L'utilisation d'un hauban 22 est préférée en l'absence de filet 21 sur la fosse de réception (sur les fosses dites pleines ou fosses à cubes). Lors de l'impact d'un gymnaste sur la toile 2 du trampoline, les ressorts du trampoline se tendent, et la force qu'exercent ces ressorts sur la barre rigide transversale 15 augmente. Cette force est transmise au premier bras 13 et au deuxième bras 14 et tend à les faire pivoter vers le haut. Cette force supplémentaire est cependant équilibrée par la réaction de la butée haute 23 et/ou par la réaction du filet ou des éléments de tension liés à la barre rigide transversale 15. La barre rigide transversale 15 reste donc parfaitement fixe lors de l'évolution d'un gymnaste, et ne tend aucunement à s'affaisser.

The angle α can be defined using a top stop 23. The first support 9 and the second support 10 can each have a top stop 23 to limit the travel of the first arm 13 and the second arm 14 in one direction. of rotation. In the initial position of the rigid transverse bar and more generally of the device, the arm linked to the support in question thus rests on the upper stop 23 of this support. In this initial position, the following forces are exerted on the rigid transverse bar and each arm:

• the horizontal traction force exerted by the springs of the trampoline on the rigid transverse bar 15, at the level of the attachment means 19. This traction force results in a more or less significant restoring torque depending on the angle α and the length of the first arm and the second arm, which tends to maintain the rigid transverse bar 15 and the system in the initial position;
• the force generated by the upper stop 23 on the corresponding arm, which balances or helps balance the horizontal traction force exerted by the springs of the trampoline;
• where appropriate, the horizontal force exerted by the net 21 of the receiving pit 7 on the rigid transverse bar at the level of the fixing means 20, and which opposes the horizontal traction force exerted by the springs of the trampoline on the rigid transverse bar 15;
• where appropriate, the force exerted by the stay 22 which can connect the rigid transverse bar 15 to the bottom of the trampoline pit or the receiving pit 7, and which creates in the first arm 13 and in the second arm 14 a torque opposed to the general torque by the horizontal traction force exerted by the springs of the trampoline on the rigid transverse bar 15. The use of a stay 22 is preferred in the absence of net 21 on the receiving pit (on the so-called pits solid or cube pits). During the impact of a gymnast on the canvas 2 of the trampoline, the springs of the trampoline tense, and the force exerted by these springs on the rigid transverse bar 15 increases. This force is transmitted to the first arm 13 and the second arm 14 and tends to make them pivot upwards. This additional force is, however, balanced by the reaction of the upper stop 23 and/or by the reaction of the net or the tension elements linked to the rigid transverse bar 15. The rigid transverse bar 15 therefore remains perfectly fixed during the evolution of 'a gymnast, and in no way tends to sag.

The device also includes a damping cylinder 24. The damping cylinder can be of different type (gas, liquid such as oil, spring). It is adapted to vary in length, such variation resulting in energy absorption. The cylinder is thus advantageously telescopic.

A first end 25 of the damping cylinder 24 is linked to one of the arms of the device, and a second end 26 is linked to the support to which the arm is fixed. The configuration of the damping cylinder 24 is such that it experiences a variation in its length when the arm to which it is linked tilts around its axis of rotation (A). To optimize the effectiveness of the damping cylinder 24 by allowing in particular the use of a very long cylinder, the second end 26 can be fixed in the lower part of the support to which it is linked, in particular on an elongated portion 27 attached to a main plate 28 to form the support.

Obviously, the device can be equipped with a damping cylinder at each of the two supports 9,10.

There Figure 4 represents, in a schematic view, the device of the figure 2 in a so-called retracted position. The device is said to be in the retracted position when the rigid transverse bar 15 is brought into a retracted position. The retracted position of the rigid transverse bar 15 is obtained by tilting it when a significant vertical force is applied to it. When moving from the initial position shown to the figure 2 And 3 to the retracted position of the Figure 4 , the energy of the vertical impact on the rigid transverse bar 15 is gradually absorbed by the increase in the tension of the trampoline springs, the friction in the pivot connection between the arms and the supports, and by the damping cylinder(s). 24. The device further comprises on the first support 9 and on the second support 10 a lower stop 29. After having pivoted by a certain angle while the rigid transverse bar 15 reaches its retracted position, each of the first arms 13 and second arm 14 rests on the lower stop 29 of the support to which it is linked. The lower stop 29 is advantageously made of an elastic material (rubber, silicone, etc.) so that it allows energy absorption when the first arm 13 and the second arm 14 each come into contact. To this end, each arm can be provided with a low receiving surface 30 for the low stop, and/or a high receiving surface 31 for the high stop. The lower stop 29 makes it possible to limit the movement of the arms 7, 8 and the rigid transverse bar 15, so that in the retracted position of the rigid transverse bar 15 it returns, after cessation of the vertical force applied to it , spontaneously towards its original position under the effect of the force exerted on the rigid transverse bar 15 by the springs of the trampoline which are linked to it and, where appropriate, of the force exerted by the damping cylinder 24.

The device thus developed offers effective protection to gymnasts against the consequences of a fall in the interface zone between a trampoline and a landing pit. Thanks to the use of kinematics by tilting a rigid transverse bar and thanks to its general configuration, the device is only in interface with the edges of the trampoline pit, and is not in interface with the bottom of the trampoline pit or the reception pit (with the exception, where applicable depending on the embodiment envisaged, of the attachment to the bottom of a guying), which allows implementation of the device without particular adaptation to the depth of the pit to be equipped.

Compared to systems known in the prior art, the device has no negative influence on the dynamic response of the trampoline, it is reliable, and does not implement a complex mechanism.

Claims (11)

1. An interface device between a trampoline (1) and a receiving pit (7) which is adjacent to the trampoline (1), comprising:

   - a first support (9) and a second support (10) intended to be fastened respectively on opposite lateral walls (11,12) of a trampoline pit (3);

   - a first arm (13) which is pivotally mounted on the first support (9) and a second arm (14) which is pivotally mounted on the second support (10), the first arm (13) and the second arm (14) pivoting about the same transverse axis of rotation (A),

   - a rigid transverse bar (15) linked to an end of the first arm (13) and to an end of the second arm (14), such that it can tilt about the axis of rotation (A) of the first arm (13) and second arm (14) between an initial position and a retracted position, said rigid transverse bar (15) being adapted to hooking the trampoline (1).
2. The interface device between a trampoline (1) and a receiving pit (7) according to claim 1, wherein each of the first support (13) and second support (14) comprises a high stop (23) on which the arm linked to the support bears when the rigid transverse bar (15) is in the initial position.
3. The interface device between a trampoline and a receiving pit (7) according to claim 1 or claim 2, wherein the first support (9) and the second support (10) each comprise a lower stop on which the arm linked to the support bears when the rigid transverse bar is in the retracted position.
4. The interface device between a trampoline and a receiving pit (7) according to one of the preceding claims, further comprising a damping cylinder (24) one first end (25) of which is linked to the first arm (13) or to the second arm (14), in the vicinity of the end thereof which is linked to the rigid transverse bar (15), and one second end (26) of which is linked to the support to which said arm is mounted.
5. The interface device between a trampoline (1) and a receiving pit (7) according to claim 4, wherein the first support (9) and the second support (10) each comprise a main plate (28) and an elongated portion (27) of extension to which is linked the second end (26) of the damping cylinder (24) linked to the support, said elongated portion (27) being rigidly fastened to the main plate.
6. The interface device between a trampoline (1) and a receiving pit (7) according to claim 4 or claim 5, comprising two damping cylinders (24), respectively linked to the first arm (13) and to the second arm (14).
7. The interface device between a trampoline (1) and a receiving pit (7) according to one of the preceding claims, wherein the first support (9) and the second support (10) each have an elongated shape defining a main direction (D) corresponding to the vertical when the support is fastened in a trampoline pit (3), wherein the first arm (13) and the second arm (14) form an angle comprised between 30° and 85°, preferably in the range of 45°, relative to the main direction (D) when the rigid transverse bar (15) is in the initial position.
8. The interface device between a trampoline (1) and a receiving pit (7) according to one of the preceding claims, wherein the rigid transverse bar (15) comprises a first element (16) linked to the first arm (13), a second element (17) linked to the second arm (14), and a central element (18) engaged on the first element (16) and on the second element (17)
9. An assembly comprising:

   - a trampoline pit (3) and a receiving pit (7) adjacent to the trampoline pit (3),

   - an interface device between a trampoline (1) and a receiving pit (7) according to one of the preceding claims, and

   - a trampoline (1) stretched above said trampoline pit (3) and attached to the rigid transverse bar (15) of the interface device.
10. The assembly according to claim 9, wherein the receiving pit (7) comprises a net (21) linked to the rigid transverse bar (15) of the interface device.
11. The assembly according to claim 9 or claim 10, further comprising a flexible tension element such as a rope, a strap or a chain, which connects the rigid transverse bar (15) of the device to a bottom of the trampoline pit (3) or of the receiving pit (7).

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