EP3492153B1 - Heel unit for ski binding - Google Patents

Description

The present invention relates to a rear retaining device, or heel, for attaching a shoe to a sliding machine.

The document US 3,797,843 A describes such a rear retaining device which includes rollers which make it easier to put on the shoe. The document FROM 20 2017 105772 U1 describes a retaining device much more recent than the previous one in which rollers are used to produce shoe holding structures.

Usually, each ski is equipped with a binding comprising a front toe piece and a heel piece. This type of binding, called triggerable, allows, on the one hand, the retention of the shoe secured to the sliding machine during skiing and, on the other hand, the release of the shoe when the user exercises, via his shoe, excessive force on an element of the binding. Conventionally, the sole of the shoe engages, at the front end, with a jaw of the front stop and, at the rear end, with a jaw of the heel. A return means is generally provided making it possible to bring the jaw of the heel closer towards the front stop so as to maintain contact of the jaws with the sole and therefore to maintain the shoe in the binding. Thus, this support is continuous, particularly when the ski flexes. We designate by “Recoil” the known function consisting of ensuring this approach of the heel towards the front stop.

In order to limit the risk of injury to the user during a fall, elements of the binding incorporate triggering mechanisms allowing the shoe to be separated from the binding. Heel cups are generally designed to release the shoe when too much vertical force is applied by the shoe to the jaw of the heel cup. We then speak of vertical triggering of the binding, this triggering producing the separation of the shoe from the binding. Front stops are generally designed to release the shoe when too great a transverse force is applied by the shoe on the toe jaw. We then speak of lateral release of the binding, this release also producing the separation of the shoe from the binding. In certain constructions, lateral release is provided by a release mechanism housed in the heel piece. These trigger mechanisms often include adjustment means making it possible to adjust the force threshold for triggering the binding.

To place the shoe in the binding, the skier engages the front of the sole of his shoe in the jaw of the toe piece, then engages the heel of the sole in the jaw of the heel piece. The user then acts on the jaw of the heel with their heel to tilt it into a stable engaged configuration. During this step, the rear jaw moves back, which causes the compression of a spring in the “Recoil” mechanism. Once the heel jaw has flipped into its configuration engaged, the spring exerts a force directly or indirectly on the jaw so as to maintain contact of the jaws with the sole.

When placing the shoe in the binding and when vertically releasing the binding, the shoe interacts with the jaw of the heel to switch it from an engaged configuration to a released configuration or vice versa. During this change in configuration, the vertical release mechanism and/or the “Recoil” mechanism exerts a force transmitted by the jaw of the heel on the sole. Consequently, this stress on these mechanisms generates friction forces between the sole and the jaw when the jaw changes configuration. These friction forces disrupt the characteristics of the fastener. On the one hand, they influence the putting on effort, that is to say, the effort that the user must exert on his heel to tilt the jaw of the heel into its engaged configuration. On the other hand, they can cause the shoe to get stuck when taking off your shoes.

These disadvantages are all the more marked when using shoes having soles sized for better grip on the ground, as is particularly the case with a generation of shoes designed for walking, for example made of rubber. In fact, this type of sole generates significant friction forces when it interacts with the jaw of the heel.

To overcome this drawback, the document EP2578277 proposes to facilitate putting on and not interfere with the release of the heel piece by inserting an interface piece between the sole and the jaw of the heel piece. This interface part is made with a material having a low coefficient of friction in order to improve the operation of the binding. However, even if slight, there is always friction between the sole and the jaw.

The aim of the invention is to propose a rear retaining device for a shoe attachment on an improved sliding machine.

One aim is in particular to make it easier to put the shoe into the binding.

Another goal is to make it easier to remove the shoe from the binding.

Another goal is to have a rear retaining device exhibiting homogeneous mechanical behavior, little dependent on the type of shoe used.

The invention proposes a rear retaining device for a binding according to claim 1.

Thanks to this construction, when changing configuration, the contact between the sole and the jaw is mainly a rolling contact which makes it possible to greatly reduce the relative friction between these two parts. This reduces the parasitic forces generated by the friction forces induced by the interaction between the sole and the jaw. Putting on shoes will require less effort from the user. In addition, ejection of the shoe from the jaw will be made easier.

• le dispositif comprend un moyen élastique intercalé entre le châssis et une interface solidaire de l'engin de glisse de sorte que le moyen élastique exerce un effort sur le châssis selon une direction longitudinale à l'engin de glisse,
• le rouleau est agencé de sorte qu'une portion de la surface de contact du rouleau est apte à être uniquement en contact avec une surface verticale périphérique d'un rebord arrière de la chaussure, lors de la mise en place de la chaussure dans la fixation,
• le rouleau est agencé de sorte qu'une portion de la surface de contact du rouleau est apte à être le premier contact avec la chaussure, avant tout autre partie de la mâchoire, lors de la mise en place de la chaussure dans la fixation,
• le rouleau est agencé de sorte qu'une fois la chaussure mis en en place dans la fixation, aucune surface de contact du rouleau n'est en contact avec la chaussure,
• la mâchoire comprend deux rouleaux distincts, disposés symétriquement par rapport à un plan vertical médian de la mâchoire,
• le rouleau présente une forme tronconique, le rouleau étant assemblé sur la mâchoire de sorte que la partie tronquée du cône est orientée vers un plan vertical médian de la mâchoire,
• le rouleau est porté par un support destiné à s'insérer dans un logement d'un corps de la mâchoire,
• le support comprend un aménagement prévu pour coopérer avec un arbre d'articulation de la mâchoire de sorte à maintenir le support dans le logement du corps de la mâchoire.

According to advantageous but not obligatory aspects of the invention, such a rear restraint device can incorporate one or more of the following characteristics, taken in any technically admissible combination:

• the device comprises an elastic means interposed between the chassis and an interface secured to the sliding machine so that the elastic means exerts a force on the chassis in a direction longitudinal to the sliding machine,
• the roller is arranged so that a portion of the contact surface of the roller is able to be only in contact with a peripheral vertical surface of a rear edge of the shoe, when placing the shoe in the binding ,
• the roller is arranged so that a portion of the contact surface of the roller is capable of being the first contact with the shoe, before any other part of the jaw, when placing the shoe in the binding,
• the roller is arranged so that once the shoe is placed in the binding, no contact surface of the roller is in contact with the shoe,
• the jaw comprises two distinct rollers, arranged symmetrically with respect to a median vertical plane of the jaw,
• the roller has a frustoconical shape, the roller being assembled on the jaw so that the truncated part of the cone is oriented towards a median vertical plane of the jaw,
• the roller is carried by a support intended to be inserted into a housing of a body of the jaw,
• the support comprises an arrangement intended to cooperate with a joint shaft of the jaw so as to maintain the support in the housing of the body of the jaw.

The invention also relates to a shoe attachment for a sliding machine, comprising a front retaining device and a rear retaining device as described above.

• la figure 1 est une vue en perspective avant partielle d'un ski muni d'un dispositif de retenue arrière d'une fixation selon l'invention ;
• la figure 2 est une coupe longitudinale médiane selon un plan vertical médian XZ passant par l'axe longitudinal du ski ;
• la figure 3 est une vue éclatée du dispositif de retenue arrière selon l'invention ;
• la figure 4 est une vue de face de la mâchoire du dispositif de retenue arrière ;
• la figure 5 est une vue en coupe selon V-V de la figure 6 ;
• la figure 6 est une vue en coupe selon VI-VI de la figure 5 ;
• les figures 7 à 9 sont des vues en coupe selon un plan vertical médian XZ parallèle à l'axe longitudinal du ski, d'un ski muni d'un dispositif de retenue arrière représentant les différentes étapes de la mise en place de la chaussure dans la fixation.

Other characteristics and advantages of the invention will be better understood with the aid of the description which follows, with reference to the appended drawings illustrating, according to non-limiting embodiments, how the invention can be carried out, and in which :

• there figure 1 is a partial front perspective view of a ski provided with a rear retaining device of a binding according to the invention;
• there figure 2 is a median longitudinal section along a median vertical plane XZ passing through the longitudinal axis of the ski;
• there Figure 3 is an exploded view of the rear retaining device according to the invention;
• there Figure 4 is a front view of the jaw of the rear retainer;
• there Figure 5 is a sectional view along VV of the Figure 6 ;
• there Figure 6 is a sectional view according to VI-VI of the figure 5 ;
• THE figures 7 to 9 are sectional views along a median vertical plane

There figure 1 is a front perspective view of a sliding machine 2, in this case a ski, provided with a rear retaining device 1 with a binding according to the invention. The binding ensures the connection or separation of a shoe 3 with the ski 2. It comprises, in a manner known per se, a front retaining device, called a stop, not illustrated in the figures, and a rear retaining device 1, says heel.

In the following description, terms such as “horizontal”, “vertical”, “longitudinal”, “transverse”, “upper”, “lower”, “top”, “bottom”, “front” will be used. , " back ". These terms must in fact be interpreted relatively in relation to the normal position that the retaining device occupies on a ski, and the normal direction of advancement of the ski. For example, “longitudinal” is understood in relation to the longitudinal axis of the ski.

We will also use a marker whose front/back direction corresponds to the X axis, the transverse or right/left direction corresponds to the Y axis and the vertical or up/down direction corresponds to the Z axis.

Likewise, “engagement” means the attachment of the shoe to the binding and “release” means the separation of the shoe from the binding. On the other hand, “vertical release” corresponds to the release of the binding by a vertical force of the shoe on the binding. In the example illustrated, vertical triggering is carried out at the level of the heel using a trigger mechanism 14.

The shoe 3 comprises a sole 31 comprising a front edge, capable of cooperating with a jaw of the stop, and a rear rim 311, capable of cooperating with a jaw 11 of the heel piece 1. The rear rim 311 is defined by a lower surface 3111, a peripheral vertical surface 3112 and a top surface 3113. The peripheral vertical surface 3112 may be slightly inclined relative to the vertical direction.

The ski 2 comprises a lower surface 21, called the sliding surface, intended to be in contact with the snow, and an upper surface 22, opposite the sliding surface. The elements of the binding are assembled on the ski, on the side of its upper surface.

Thus, the rear retaining device 1 described, that is to say, the heel, comprises a jaw 11, a frame 12, a vertical trigger mechanism 14, an interface 15 and a Recoil mechanism 16.

The interface 15 is fixed directly to the upper surface 22 of the ski.

In this example, the chassis 12 is mounted only sliding along the longitudinal axis X of the ski, thanks to a slide-type connection.

The Recoil mechanism 16 comprises an adjustment member 162, capable of cooperating with the interface 15 at different longitudinal positions relative to the interface, and an elastic means 161 interposed between the adjustment member 162 and a part of the chassis 12 , so as to exert a force on the chassis in the direction of the stop, that is to say in the direction of the front of the ski. The elastic means 161 is thus interposed between the chassis 12 and the interface 15 secured to the sliding machine so that the elastic means exerts a force on the chassis in a longitudinal direction X to the sliding machine. In this embodiment, the longitudinal position of the heel can be adjusted by modifying the longitudinal position of the adjustment member relative to the interface.

According to a variant not shown, the frame is directly fixed to the upper surface of the ski. In this case, there is no interface 15. In this case, the chassis 12 is mounted on the sliding machine in a fixed manner relative to the sliding machine.

Alternatively, the elastic means is interposed between the chassis 12 and directly the interface 15, without an adjustment member capable of cooperating with the interface 15 at different longitudinal positions relative to the interface. In these last two cases, the position of the heel is not adjustable longitudinally.

The jaw 11 is rotatably mounted on the chassis 12 around a first axis Y111 transverse to the chassis in a plane parallel to the sliding surface 21 of the ski, when the heel piece is assembled to the ski. In this example, the jaw 11 rotates around a hinge shaft 13 mounted on the chassis 12 in a transverse direction Y to the chassis.

The vertical trigger mechanism 14 is here housed in the frame 12 and interacts with a part of the jaw 11 to switch it between two stable configurations: an engaged configuration for which the jaw 11 acts on the sole 31 in order to keep it in grip with the attachment, as shown in Figure 9 , and a triggered configuration for which the sole 31 is able to disengage vertically from the jaw 11 which allows the release of the shoe from the binding, as illustrated in Figure 7 . In a variant, the vertical trigger mechanism 14 is housed in the jaw 11 and interacts with part of the frame 12.

• soit uniquement rotatif autour d'un axe normal Z à une surface de glisse 21 de l'engin de glisse,
• soit uniquement coulissant selon un axe longitudinal X de l'engin de glisse et rotatif autour d'un axe normal Z à une surface de glisse 21 de l'engin de glisse.

According to a variant not shown, the frame 12 carrying the jaw 11 is mounted on a lower body assembled at the interface or directly to the ski. In this case, the lower body can be mounted either sliding along a longitudinal axis X of the sliding machine, or fixed relative to the sliding machine. Furthermore, the chassis is rotatably mounted on the lower body around a Z axis normal to the sliding surface when the heel piece is assembled to the ski. The relative rotation between the frame and the lower body is controlled by a side trigger mechanism. Thus, the heel piece according to this variant ensures double triggering, vertical and lateral. In this example, the chassis 12 is thus mounted on the sliding machine in such a way:

• either only rotatable around a normal axis Z to a sliding surface 21 of the sliding machine,
• either only sliding along a longitudinal axis X of the sliding machine and rotating around a normal axis Z to a sliding surface 21 of the sliding machine.

The jaw 11 comprises a body 111, two rollers 112a, 112b and two supports 113a, 113b.

The body 111 comprises bearings 1115 in the form of bores passing through the body along a transverse axis Y to the body. These bearings 1115 are intended to receive the articulation shaft 13 carried by the chassis 12.

In its rear part, the body 111 extends towards the rear by an actuating lever 1111 making it possible to cause the rotation of the jaw. This lever allows the boot to be released from the binding by a simple action by the skier. Thus, pressing this lever with a stick, his hand or his other shoe, the user can cause the jaw to tilt backwards, from its engaged configuration to its triggered configuration. The actuating lever can form a unitary part with the body or be a separate part, fixed directly to the body. In these two embodiments, the jaw is called one-piece. According to another variant, the actuating lever is separate from the body and has a kinematics relative to the chassis different from that of the body relative to the chassis. In this case, the operating lever will interact with the body so that the movement of the lever results in a different movement of the body.

In its front part, the body 111 comprises an upper stop 1113, a lower tongue 1112 and front face 1114 connecting the upper stop and the lower tongue. The upper stop 1113, also called "sole clamp", is made by a lower surface of a rim delimiting the upper front part of the body. The upper stop 1113 is capable of coming into contact with the upper surface 3113 of the rear edge 311 of the sole 31 when the jaw 11 is in its engaged configuration and the shoe 3 is engaged with the binding, as illustrated in Figure 9 . The lower tab 1112, also called "pedal", forms an extension projecting towards the front of the body and delimiting the lower anterior part of the body. The lower tongue 1112 comprises an upper face on which the lower surface 3111 of the rear edge 311 of the sole 31 rests when the user puts his shoe on in the binding, as seen in the figure 8 . In other words, the lower tongue 1112 is able to be in contact with the lower surface 3111 of the rear edge 311 of the sole 31. The lower tongue serves as an actuator to tilt the jaw forward.

When putting on, the boot will interact with the jaw to switch it from its triggered configuration to its engaged configuration but also to move the jaw and the frame back relative to the ski. This rearward movement of the chassis equipped with the jaw causes compression of the elastic means 161 of the Recoil mechanism 16.

During this change of configuration, the sole will rub against the front face 1114 of the front part of the body 111. This friction is the cause of an increase in the effort necessary for putting the shoe into the binding . Similarly, this friction disrupts the removal of the shoe from the binding. In fact, the trigger mechanism and the recoil mechanism exert a force on the sole, via the jaw, which can block the sole between the jaw of the toe piece and the jaw of the heel piece. The sole gets stuck against the front face. The user must then exert additional effort upwards to unblock the shoe. This disadvantage is accentuated when using shoes suitable for walking, for example with rubber parts. In a classic binding, this friction constitutes a disadvantage penalizing the functionality of the heel piece.

The invention overcomes these problems by proposing a heel piece incorporating rollers 112 arranged at the level of this front face 1114. Thus, the contact between the rear edge of the sole and the jaw will be a "rolling" contact, throughout or in part. , the tilting of the jaw from a triggered configuration to an engaged configuration, or vice versa. This type of contact reduces the effort of putting on shoes and makes it easier to eject the shoe from the binding. The risk of the shoe getting stuck in the heel jaw is greatly reduced.

According to the invention, the jaw comprises at least one roller 112a, 112b rotatably mounted around a second axis Y112 parallel to the first axis Y111 or oriented at an angle less than 45° relative to the first axis, the roller being arranged so that a portion of a contact surface 1122 of the roller is capable of being in contact with the shoe, when placing the shoe in the binding.

The rollers are preferably made with a material having improved tribological characteristics, in particular a material having a low coefficient of friction, for example, a polyoxymethylene (POM), a polyamide (PA) or a material loaded with Teflon. Likewise, to reduce parasitic friction forces, the surface condition of the contact surface 1122 can be smooth, with low roughness.

Each roller 112a, 112b is inserted into a housing 1116 provided in the body 111 of the jaw 11 so that part of the roller projects from the front face 1114 of the body of the jaw, when the roller is assembled on the body. Advantageously, the housing is open on the side of the front face 1114 of the body of the jaw. The roller is then introduced into its housing from the front face 1114. The rollers cannot therefore be disassembled when the shoe is engaged with the binding.

In the example illustrated, the jaw 11 comprises two distinct rollers 112a, 112b, arranged symmetrically with respect to a median vertical plane XZ11 of the jaw. This allows for two distant contacts between the sole and the jaw rollers. This reduces the contact pressure exerted on the rollers and therefore the friction forces. In addition, this contributes to the positioning and guidance of the heel when putting on shoes.

The rollers 112a, 112b comprise a bore 1121 intended to receive a rotation shaft 1131 around which the roller will rotate, and a contact surface 1122 capable of being in contact with the shoe, when placing the shoe in the fixation. The contact surface 1122 corresponds to the surface generated by all the generators of a roller. A roller, within the meaning of the invention, forms a cylinder which can be circular, conical, toroidal, etc. In the example illustrated, each roller has a frustoconical shape, the roller being assembled on the jaw so that the truncated part of the cone is oriented towards a median vertical plane XZ11 of the jaw. This construction makes it possible to obtain a large contact surface with the sole without having to strongly tilt the axis of rotation of the rollers. Increasing the contact surface allows the contact pressure to be reduced. As a result, the sole is less marked (less damage to the shoe) and parasitic friction forces are reduced.

According to one variant, the heel piece comprises a single central roller, which makes it possible to reduce the number of constituent parts. Advantageously, this single roller can have the shape of a “diabolo” to increase the contact areas with the sole and re-center it when putting on shoes.

According to one embodiment, each roller rotates around the articulation axis of the jaw. Thus, the rotation shaft 1131 of the roller is the articulation shaft 13 of the jaw.

According to the illustrated embodiment, each roller 112a, 112b is carried by a support 113a, 113b intended to be inserted into the housing 1116 of the body 111 of the jaw. Each support 113a, 113b comprises a rotation shaft 1131 on which a roller 112a, 112b is mounted. Thus, the bore 1121 of the roller is crossed by this rotation shaft 1131. According to a most simplistic construction, the support is a simple circular cylindrical shaft inserting into notches provided in the body of the jaw. In the example illustrated, the rotation shaft 1131 projects from a side wall 1134 of the support 113.

According to one embodiment, the rotation shaft 1131 of the roller of each support 113a, 113b comprises a recovery surface 1132 capable of cooperating with a complementary surface 1117, provided in the housing of the body of the jaw, when the support is mounted In the body of the jaw. This allows better distribution of the forces exerted by the sole on the jaw, via the rollers 112, when putting on shoes. In this way, the support is preserved from premature degradation. Advantageously, the recovery surface 1132 and the complementary surface 1117 are oriented substantially perpendicular to the direction of insertion of the support 113 in its housing 1116.

According to one embodiment, the support comprises an arrangement capable of cooperating with an element of the heel so as to keep the support integral with the body of the jaw. For example, the arrangement may be a clip cooperating with a notch provided on the body. In the illustrated embodiment, the arrangement is intended to cooperate with the articulation shaft 13 of the jaw so as to maintain the support 113 in the housing 1116 of the body of the jaw. In this example, it is an opening 1133 passing through the side wall 1134 of the support. The opening 1133 is dimensioned and positioned so that, when the support 113 is placed in its housing 1116, the installation of the articulation shaft 13 passes through this opening 1133, during the assembly of the jaw on the frame. Thus, part of the side wall 1134 delimiting the opening 1133 abuts against the articulation shaft 13 when the support is removed from its housing. Thus, as long as the articulation shaft is in place, the support is held integral with the body of the jaw. This construction is simple and does not require additional parts to maintain the support.

In this example, the support also comprises guide faces cooperating with complementary guide faces of the housing so as to facilitate the insertion of the support into its housing by a translation in a direction, preferably perpendicular to the axis of rotation Y111 of jaw.

According to the illustrated embodiment, the rotation shaft 1131 of the support 113 is dimensioned and positioned so that, when the support 113 is placed in its housing 1116, the projection of the axis of the rotation shaft 1131 in a plane passing through the axis of the hinge shaft 13 and parallel to the axis of the rotation shaft 1131 is oriented at an angle α relative to the axis of the hinge shaft 13 of the jaw. The angle α is less than 45°, preferably less than 30°. This construction allows the rollers to be inclined relative to the XZ11 midplane of the jaw. Thus, with two rollers, we can obtain two distant contacts with the sole which allows better guidance of the heel and its recentering when putting on shoes. This also makes it possible to increase the contact surface 1122 with the sole. According to one embodiment, the axis of the rotation shaft 1131 and the axis of the articulation shaft 13 are coplanar.

Advantageously, the internal faces of the two housings 1116 have a relief relative to the same demolding direction Sd. The undercut characterizes a slope, an inclination, relative to the demolding direction Sd, provided in order to ensure demoulding. The draft angle is at least zero degrees but is preferably at least one degree. The demolding direction Sd corresponds to the assembly direction of a support in its housing of the body. This construction makes it possible to simplify the mold used to produce the body of the jaw. Thus, the front part of the body can be obtained by a single movement of a simple drawer, due to the absence of undercut. This type of mold is therefore simple and economical.

The rollers 112 are designed to be able to be in contact with only the peripheral vertical surface 3112 of the rear edge 311 of the sole 31 of the shoe 3, when placing the shoe in the binding.

To better understand the invention, we will detail, with the figures 7 to 9 , the kinematics of putting on the heel, in particular the tilting of the jaw from its triggered configuration to its engaged configuration.

After introducing the front of the shoe into the jaw of the toe, the user lowers his heel until it comes into contact with an element of the shoe. In this example, the edge comes into direct contact with the rollers as seen in the Figure 7 . Thus, each roller is arranged so that a portion of the contact surface 1122 of the roller is capable of being in contact with the intersection between the peripheral vertical surface 3112 and the lower surface 3111 of the rear edge 311 of the shoe, when of putting the shoe in the binding. Thus, the roller is arranged so that a portion of the contact surface of the roller is capable of being the first contact with the shoe, before any other part of the jaw 11, when placing the shoe in the fixation.

According to a variant, the first contact between the shoe and the jaw can be made at the level of the front face 1114 of the body 111 of the jaw, above the rollers. In this case, by continuing to put on the shoe, the sole will first slide on the front face 1114 before coming into contact with the rollers to cause their rotation. In this case, instead of having a continuous rolling kinematics as in the first case, we will have a sliding kinematics followed by a rolling kinematics. The rolling kinematics greatly reduce parasitic frictional forces.

The user then continues to lower his heel, in direction C, until the lower surface 3111 of the rear edge 311 of the shoe comes into contact with the lower tongue 1112 of the body of the jaw, as illustrated in figure 8 . During this movement, the sole will cause the rotation of the rollers at the same time as the recoil of the assembly composed of the jaw and the chassis, that is to say, the movement of this assembly towards the rear of the ski , according to direction T.

By continuing his action of lowering his heel, the user will engage the binding. The jaw will thus switch from its triggered configuration to its engaged configuration illustrated in Figure 9 . The rotation of the jaw is illustrated by the arrow R at the Figure 9 . Initially, the pivoting of the jaw around the axis of rotation Y111 is caused by the action of the shoe on the lower tongue 1112 up to a certain angle of rotation. Then, in a second step, the end of the tilting of the jaw results from an action of the trigger mechanism 14, until the jaw comes to bear against the rear edge 311 of the shoe. In this configuration, the upper stop is in contact with the sole and the lower tongue is no longer in contact with the sole. The jaw then exerts a pressing force on the sole to maintain contact between the underside of the sole and a support plate and, combined with the recoil mechanism, to maintain contact between the sole and the jaw of the stop. The pressing force is applied downwards, in a Z direction, and towards the stop, in an X direction.

Thus, each roller is arranged so that a portion of the contact surface 1122 of the roller is able to be in contact with the peripheral vertical surface 3112 of the rear edge 311 of the shoe, when placing the shoe in fixation.

According to one embodiment, each roller is sized and arranged so that the peripheral vertical surface 3112 of the rear edge 311 of the shoe is in contact only with the roller, when the jaw switches from its triggered configuration to its engaged configuration. In other words, during this tilting of jaw configurations, this peripheral vertical surface 3112 is not in contact with the anterior face 1114. This makes it possible to reduce the parasitic friction forces resulting from contact between the shoe and another part of the jaw.

In the illustrated example, as seen in Figure 9 , the roller is arranged so that once the shoe is placed in the binding, no contact surface of the roller is in contact with the shoe. Indeed, in this shod configuration, the shoe is only in engagement with other parts of the jaw, namely the upper stop 1113 and the front face 1114. The roller is set back, towards the rear of the ski. This construction makes it possible to obtain very good support for the shoe when it is engaged with the binding.

To facilitate taking off the shoe, in addition to the tongue 1112, the jaw may also include at least one ejection extrusion projecting from the front face 1114 towards the front of the ski, the extrusion being located in the lower part of the jaw. The ejection extrusion comprises an upper bearing face intended to come into contact with a lower part of the lower surface 3111 of the rear edge 311 of the sole 31 of the shoe. To help remove shoes, this upper support surface is positioned slightly above (in a vertical direction Z) the upper support surface of the tongue 1112, when the jaw is not engaged with the shoe. Advantageously, the jaw has two ejection extrusions arranged at the level of the lateral edges of the front face 1114 of the jaw. In a variant, an ejection extrusion can also be carried out by a form of a support 113a, 113b of a roller 112a, 112b.

The invention is not limited to these embodiments. It is possible to combine these embodiments.

The invention is not limited to the embodiments previously described but extends to all the embodiments covered by the appended claims.

Nomenclature

1. 1- Rear restraint system
   • 11- Jaw
     • 111- Body
       • 1111- Actuation lever
       • 1112- Tab
       • 1113- Upper stop
       • 1114- Front side
       • 1115- Landing
       • 1116- Housing
       • 1117- Complementary surface
     • 112a,b - Roller
       • 1121- Bore
       • 1122- Contact surface
     • 113a,b- Support
       • 1131- Rotation shaft
       • 1132- Recovery surface
       • 1133- Opening
       • 1134- Side wall
   • 12- Chassis
   • 13- Joint shaft
   • 14- Vertical trigger mechanism
   • 15- Interface
   • 16- Recoil Mechanism
     • 161- Medium elastic
     • 162- Adjusting body
2. 2- Sliding machine
   • 21- Sliding surface
   • 22- Upper surface
3. 3- Shoe
   31- Sole
   311- Rear ledge
   • 3111- Lower surface
   • 3112- Peripheral vertical surface
   • 3113- Upper surface

Claims (9)

1. Rear retaining device (1) for a binding of a boot (3) on a gliding device (2), comprising:

   - a chassis (12) intended to be mounted on the gliding device so as to be

   • either only slidable along a longitudinal axis (X) of the gliding device,

   • or only slidable along a longitudinal axis (X) of the gliding device and rotatable about an axis (Z) normal to a gliding surface (21) of the gliding device,

   - a jaw (11) for retaining a heel of the boot, the jaw being mounted so as to be rotatable on the chassis about a first axis (Y111) transverse to the body in a plane parallel to the gliding surface of the gliding device when the chassis is mounted on the gliding device, characterized in that

   the jaw comprises at least one roller (112a, 112b) mounted so as to be rotatable about a second axis (Y112) parallel to the first axis or oriented by an angle of less than 45° with respect to the first axis, the roller being arranged so that a portion of a contact surface (1122) of the roller is able to be in contact with the boot when placing the boot in the binding;

   in that the roller is arranged so that a portion of the contact surface of the roller is able to be the first contact with the boot, before any other part of the jaw (11), when placing the boot in the binding;

   and in that it comprises an elastic means (161) interposed between the chassis and an interface (15) secured to the gliding device, such that the elastic means exerts a force on the chassis in a longitudinal direction (X) with respect to the gliding device.
2. Rear retaining device (1) according to Claim 1, characterized in that the roller is arranged so that a portion of the contact surface of the roller is able to be in contact with the intersection between a peripheral vertical surface (3112) and a lower surface (3111) of a rear rim (311) of the boot when placing the boot in the binding.
3. Rear retaining device (1) according to either of the preceding claims, characterized in that the roller is arranged so that a portion of the contact surface of the roller is able to be only in contact with a peripheral vertical surface (3112) of a rear rim (311) of the boot when placing the boot in the binding.
4. Rear retaining device (1) according to one of the preceding claims, characterized in that the roller is arranged so that, once the boot is placed in the binding, no contact surface of the roller is in contact with the boot.
5. Rear retaining device (1) according to one of the preceding claims, characterized in that the jaw comprises two separate rollers (112a, 112b) arranged symmetrically with respect to a median vertical plane (YZ11) of the jaw.
6. Rear retaining device (1) according to one of the preceding claims, characterized in that the roller has a frustoconical shape, the roller being assembled on the jaw so that the truncated part of the cone is oriented towards a median vertical plane (YZ11) of the jaw.
7. Rear retaining device (1) according to one of the preceding claims, characterized in that the roller is borne by a support (113a, 113b) intended to be inserted into a housing (1116) of a body (111) of the jaw.
8. Rear retaining device (1) according to the preceding claim, characterized in that the support comprises an arrangement (1133) intended to cooperate with an articulation shaft (13) of the jaw so as to hold the support in the housing of the body of the jaw.
9. Binding of a boot for a gliding device, comprising a front retaining device and a rear retaining device according to any one of the preceding claims.

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