FR2816516A1 - In-line roller skate has one-piece plate with flexible angled ends to absorb shocks - Google Patents

Abstract

Roller skate consists of one-piece plate of fibre-reinforced resin material in monolithic or sandwich structure, with middle section forming platform for fastening to sole of boot, and two ends sloping down from central section at angle of over 95 but less than 175 deg . The roller skate consists of a one-piece plate (2) of a fibre-reinforced resin material in a monolithic or sandwich structure, with a middle section (14) forming a platform for fastening to the sole of a boot (1), and two ends (18, 20) sloping down from the central section at an angle of over 95 but less than 175 deg. At least one of the ends is elastically deformable under an acceleration of at least 1G so it can absorb shocks from the wheels (10, 12). The wheels can have inflatable tyres and a brake (8) operated from a handle on a separate stick.

Description

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L'invention concerne le domaine des patins à roues en ligne, encore appelés rotters . Plus particulièrement, l'invention concerne des patins à roues en ligne destinés à être utilisés sur des surfaces très diverses, certaines de ces surfaces pouvant être accidentées. IN-LINE WHEEL SKATING AND SHOCK ABSORBING

The invention relates to the field of inline skates, also called rotters. More particularly, the invention relates to inline skates intended for use on a wide variety of surfaces, some of these surfaces possibly being damaged.

urbain, le roller tout terrain, le roller tiré par un cerf volant, le roller-ski (roller de pratique équivalente à celle du ski alpin), le roller-ski de fond (roller de pratique équivalente à celle du ski de fond), etc. For example, the invention consists of versatile inline skates that can be used for the practice of several sports such as roller skating.

urban, all-terrain rollerblading, rollerblading pulled by a kite, roller-ski (roller skating equivalent to that of alpine skiing), roller-ski cross-country (roller skating equivalent to that of cross-country skiing), etc.

 The invention relates to the skates themselves, as well as sticks intended to be optionally used with these skates.

 Are already known, in particular from document WO99 / 59685, devices of the in-line roller skate type comprising a plate, this plate comprising a central part forming a platform intended for fixing a shoe, and two end parts on each of which is fixed a wheel. In this document, several devices are described. According to one of these devices, the plate is rectilinear between the axes of rotation of the wheels and flexible to allow damping of the shocks undergone at the wheels when the latter roll on an uneven surface. However, this document does not specify either the constituent material or the shape of the plate of this device. However, if the wheels are close to the shoe, the flexibility will be imparted essentially by the part of the plate located under the shoe; which causes a loss of contact between the shoe and the plate; on the other hand, if the wheels are moved away from the shoe to make the plate flexible, this will cause a loss of maneuverability of the skate. This type of skate cannot function properly on uneven terrain, particularly with regard to cornering control. According to another of these devices, the plate rests on three or four wheels. This embodiment is not particularly suitable for use on very uneven terrain on which not all the wheels

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peuvent reposer en même temps. En outre, plus le nombre de roues est élevé, plus le patin est lourd et moins il est maniable. Selon encore un autre mode de réalisation, le dispositif comporte une platine avec un système de fixation des roues, articulé et amorti. Ce système rend le montage du patin complexe et est une source de dysfonctionnement.

can rest at the same time. In addition, the higher the number of wheels, the heavier the pad and the less it is manageable. According to yet another embodiment, the device comprises a plate with a wheel fixing system, articulated and damped. This system makes mounting the skate complex and is a source of malfunction.

An object of the invention is to provide an inline skate having a simple structure and shape and not having the drawbacks of the devices of the prior art described above.

This object is achieved, according to the invention, thanks to an inline skate comprising a plate, this plate comprising a central part forming a platform intended for fixing a shoe and two end parts on each of which is fixed a wheel, the plate comprising a single piece capable of elastic deformation of at least one of the end parts relative to the central part, to allow damping of the shocks undergone at the wheels, this shoe being characterized by the fact that the end parts extend away from each other from the central part, at an angle, with respect to this central part, greater than 95 and less than 1750.

The plate of the skate according to the invention can comprise in a completely equivalent manner: - three rectilinear segments (one segment for the central part and one segment for each of the two end parts); or - an arc shape; the angle between the central part and each of the end parts then corresponds to the angle between the rectilinear base of the sole of the shoe and the segment connecting a point located on the arch, in line with the point or the heel of the shoe, and another point corresponding to the place of attachment of the wheel on the corresponding end part; or - still other forms in double or triple arc, mixing rectilinear segments and arcs, etc. ; in this case the angle between the central part and the end part is determined as indicated in the previous paragraph.

Thus, the pad of the skate according to the invention has an arcuate shape and is capable of elastic deformation, which allows damping of the

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 wheel shocks. In addition, thanks to the shape provided by the invention, part of the wheels can pass under the shoe, which allows a gain in terms of size, but above all a better maneuverability of the skate. This shape also makes it possible to raise the shoe relative to the ground, thus giving the skate according to the invention a better ability to practice on uneven terrain, than the devices of the prior art (and, in particular, that the device to straight plate extending between the axes of the wheels, described in document WO99 / 59685). In addition, the skate according to the invention has only two wheels between which the plate can be suspended. This gives a better adaptation of the skate according to the invention to uneven terrain and an increased potential for flexibility of the plate. Furthermore, the plate of the skate according to the invention is advantageously formed of a single piece, which gives the skate the property of being simple to assemble and does not have the complexity and fragility of articulated systems. The fact that the plate allows shock absorption, allows the use of less deformable wheels than if they had been alone to fulfill the damping function. The user can then use solid wheels or inflated wheels under high pressure and thus gain speed and / or reduce his efforts. The arc shape of the plate gives, in addition to the flexibility already mentioned, better resistance to vertical forces, since a component of these forces can be exerted along the longitudinal axis of the end parts.

- la platine est constituée d'un matériau apte à absorber au moins une partie des chocs subis au niveau des roues ; - la platine est constituée d'un matériau comprenant un élément de renfort compris dans la liste constituée des fibres de verre, des fibres de carbone et des fibres d'aramide ; - la platine est constituée d'un matériau comprenant une matrice The skate according to the invention advantageously comprises the following optional characteristics taken separately or in combination: - the plate is made of a material capable of deforming elastically under an acceleration at least equal to 1 G;

- The plate is made of a material capable of absorbing at least part of the shocks undergone at the wheels; - the plate is made of a material comprising a reinforcing element included in the list consisting of glass fibers, carbon fibers and aramid fibers; - the plate is made of a material comprising a matrix

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 included in the list consisting of epoxy resins, polyester resins, vinylester resins and polyurethane resins; - the plate consists of a monolithic structure.

 - the plate consists of a sandwich structure; this sandwich structure comprises structural core elements of a material included in the list consisting of wood, compressed structures, acrylic mouses and polyurethane foams; - An end part comprises a fork whose branches are adjustable in length to allow the mounting, on this end part, of a wheel with a more or less large diameter; - An end part comprises a fork whose branch spacing is adjustable to allow mounting, on this end part, of a more or less wide wheel; - It includes a brake shoe capable of clamping a wheel on either side of the plane of rotation of this wheel; in this case the jaw brake, spans the rear wheel and is preferably fixed on the plate with an angle between the central part and the plane in which the branches of the jaw move to tighten the wheel, between 1 and 1750; - it includes a disc brake; in this case, the shoe according to the invention advantageously comprises means for actuating this brake, mechanical or hydraulic; - The platinum has a density between 1.1 and 1.7 and more preferably between 1.2 and 1.5; and - at least one wheel is provided with a hub which does not allow the shoe to move backwards.

 According to another aspect, the invention relates to a stick for the practice of roller or roller skating, and in particular that of in-line roller skating in accordance with the present invention. This stick for the practice of roller skating comprises a rod provided with a brake handle and is characterized by the fact that it comprises a guard able to allow a user of the stick to press on the latter the edge of its hand holding this stick, to be able to rest on it while having fingers resting on the brake handle but do not

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 not necessarily applying this brake handle.

 Advantageously, this stick comprises a shell capable of protecting the hand of the user holding this stick, and more preferably the thumb of this hand.

- la figure 3 est une vue schématique de face du mode de réalisation du patin représenté sur les figures 1 et 2 ; - la figure 4 est une vue schématique de face d'une fourche de platine d'une variante, selon l'invention, du mode de réalisation du patin représenté sur les figures 1 à 3 ; - la figure 5 est une vue schématique de côté d'une fourche de platine d'une autre variante, selon l'invention, des modes de réalisation du patin représentés sur les figures 1 à 4 ; - la figure 6 est une vue schématique de côté d'une fourche de platine d'encore une autre variante, selon l'invention, des modes de réalisation du patin représentés sur les figures 1 à 5 ; - la figure 7 est une vue schématique de face de la fourche de platine selon l'invention, du mode de réalisation du patin représenté sur la figure 6 ; - la figure 8 est une vue schématique de face d'une fourche de platine d'encore une autre variante, selon l'invention, des modes de réalisation du patin représentés sur les figures 1 à 7 ; - la figure 9 est une vue schématique de côté d'une autre variante, selon l'invention, des modes de réalisation du patin représentés sur les figures 1 à 8, - la figure 10 est une vue schématique en perspective de côté d'un exemple de mode de réalisation du bâton selon l'invention ; et Other aspects and advantages of the invention will be better understood with the aid of the detailed description which follows. The invention will also be better understood using the appended drawings in which: - Figure 1 is a schematic side view of an exemplary embodiment of the skate according to the invention; - Figure 2 is a schematic bottom view of the embodiment of the skate shown in Figure 1;

- Figure 3 is a schematic front view of the embodiment of the shoe shown in Figures 1 and 2; - Figure 4 is a schematic front view of a platinum fork of a variant, according to the invention, of the embodiment of the shoe shown in Figures 1 to 3; - Figure 5 is a schematic side view of a platinum fork of another variant, according to the invention, embodiments of the shoe shown in Figures 1 to 4; - Figure 6 is a schematic side view of a platinum fork of yet another variant, according to the invention, of the embodiments of the pad shown in Figures 1 to 5; - Figure 7 is a schematic front view of the platinum fork according to the invention, of the embodiment of the shoe shown in Figure 6; - Figure 8 is a schematic front view of a platinum fork of yet another variant, according to the invention, of the embodiments of the shoe shown in Figures 1 to 7; - Figure 9 is a schematic side view of another variant, according to the invention, of the embodiments of the skate shown in Figures 1 to 8, - Figure 10 is a schematic side view of a exemplary embodiment of the stick according to the invention; and

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- la figure 11 est une vue schématique en perspective, partiellement arrachée, de dessus d'un autre exemple de mode de réalisation du bâton selon l'invention.

- Figure 11 is a schematic perspective view, partially broken away, from above of another exemplary embodiment of the stick according to the invention.

 FIG. 1 schematically represents a particular, but nonlimiting example, of an embodiment of the skate according to the invention.

 According to this embodiment, the skate comprises a shoe 1, a plate 2, wheels 4, a brake support 6, a brake 8 and wheels 10 and 12.

 The skate has a front and a rear directed respectively towards the toe and the heel of shoe 1.

 Shoe 1 corresponds to a conventional shoe, known to a person skilled in the art, of the type generally mounted on inline skates.

 The plate 2 is formed of a single piece, in three rectilinear segments, comprising a central part 14 forming a platform intended for fixing the shoe 1, by three screws in the sole 16 thereof, and two parts d end 18 and 20. The longitudinal axis of the plate 2 coincides with that of the shoe 1. One 18 of the end parts 18 and 20 extends towards the front of the shoe, while the other 20 extends backwards.

 The central part 14 consists of a rectangular parallelepiped having a shorter length than that of the shoe 1. This length depends on the size of the shoe 1. The thickness of the plate (that is to say the dimension perpendicular to the plane of the plate 2 in contact with the sole 16) is of the order of a centimeter but depends essentially on the weight of the user (that is to say globally correlatively to the size of the shoe 1), and of the material used for the production of plate 2.

Advantageously, the assembly consisting of the sole 16 and the central part 14, when they are fixed together, is rigid enough not to deform under the weight of the user. The width of the plate is narrower than that of shoe 1 (Fig. 2).

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 Each of the two end parts 18 and 20 extends away from the other, starting from the central part 14, at an angle a, with respect to this central part 14. This angle a is greater than 95 and less to 1750.

 As shown in Figures 2 and 3, each of the end portions 18 and 20 forms a fork with two branches 22 and 24. These branches 22,24 extend in the same plane, parallel to each other. The tip of the branches 22,24 of the end part located at the front of the shoe is directed towards the front, while the tip of the branches 22,24 of the end part located at the rear of the shoe is directed backwards. Between the branches 22, 24 of each end part, a wheel 10 or 12 is fixed. To do this, an angle-fixing plate 26 has a first part fixed to one of the branches 22 or 24, while a second part, perpendicular to the first, has a hole in which the axis of the wheel 10 or 12 is held with a nut (Fig. 1).

 The plate is produced by draping, with reinforcing elements comprising 30% carbon fibers and 70% glass fibers, soaked in an epoxy resin. The reinforcing elements are deposited on top of each other in the following proportions and in the following order: - 10% carbon fibers, - 35% glass fibers, - 10% carbon fibers, - 35% fibers of glass, and - 10% carbon fiber.

 The wheels 10,12 are inflatable wheels. They have a tire 28 mounted on a rim 30.

 The brake support 6 is mounted on the rear end part 20. To this end, two brackets 32 are welded, glued or screwed each on one of the branches 22 or 24 of the rear end part 20 respectively, between the central part 14 and the fixing plate 26, on the face of these branches corresponding to the surface of the plate 2 on which the shoe is fixed 1. The right angle of each bracket 32 has a side resting on

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 the branch 22 or 24, while the other side of this right angle is located towards the fixing plate 26. A wall 34, consisting of a plate is welded or glued between the two brackets 32, on their edge corresponding to the side from the right angle located towards the fixing plate 26. The wall 34 has an inverted U-shaped cutout for the passage of the rear wheel 12.

 The brake 8 is screwed onto the wall 34. The brake 8 is a brake comprising a jaw, of the type that is most often used to equip bicycles. This jaw spans the rear wheel 12. It has two legs articulated around an axis. One end of each of these legs is provided with a pad 36 capable of exerting friction on the rim 30 of the rear wheel 12. This jaw is actuated by a cable 38.

- l'écartement des branches 22, 24 est d'environ 3 centimètres, - la largeur des branches 22, 24 est d'environ 2 centimètres, - le poids de la platine est de 230 grammes, 3 - le volume de la platine est d'environ 161 cm3, - la densité de la platine est de 1,4, - l'angle a. est d'environ 1400 eut - les roues ont un diamètre de 15 centimètres. For example, for a shoe 1 of size 43-44 and a plate made of the material described above: - the thickness of the plate is 10 millimeters - the length of the central part 14 is approximately 18 centimeters , - the width of the central portion 14 is approximately three centimeters, - the length of each of the end portions 18.20 is approximately 12 centimeters,

- the spacing of the branches 22, 24 is approximately 3 centimeters, - the width of the branches 22, 24 is approximately 2 centimeters, - the weight of the plate is 230 grams, 3 - the volume of the plate is about 161 cm3, - the density of the plate is 1.4, - the angle a. is about 1400 eut - the wheels have a diameter of 15 centimeters.

 Many variants can be envisaged in the embodiment described above.

 For example, as illustrated in FIGS. 4 to 8, the fork of the end parts 18, 20 may have adjustment means to increase or decrease the length of the branches of this fork in order to mount wheels of more or less large diameter and / or to separate these branches so as to mount wheels of variable width on the shoe according to the invention. So,

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 the skate according to the invention becomes adaptable according to the practice desired by the user, the skate according to the invention can then be qualified as multisports, and according to the terrain, the skate according to the invention can then be qualified as multisurfaces .

 According to one of these variants, illustrated by FIG. 4, the fork includes knobs 39 for adjusting the length of the branches 22, 24 and the spacing of the latter.

 According to another of these variants, the skate according to the invention comprises means for mounting the wheels 10,12, with slide 27. These mounting means can be moved along the branches 22,24 and tightened on the latter (see figure 5).

 According to yet another variant, illustrated by FIG. 6, the fork has a plurality of positions for maintaining a wheel axle 11 or 10 or 12.

The distance between each of these positions, relative to the free end of the branches 22,24 depends on the diameter of the wheel 10,12 intended to be mounted on the skate according to the invention (and therefore possibly of the sport that the user of the skate according to the invention wishes to practice). Thus, there is shown in Figure 6, three wheels 10 or 12 of dimensions A, B, or C may be mounted one in place of the other on the plate 2 of the pad according to the invention.

 FIG. 7 represents this same variant, seen from the front. It can then be seen that the dimensions A, B and C can be distinguished from one another, not only by their diameter but also by their width.

 According to yet another variant, the plate 2 of the skate according to the invention is provided with a disc brake in place of the jaw brake 8 described above. The rear wheel 12 comprises an axle 11 provided with a disc 9 and the fork of the end portion 20 comprises, between one of the branches 22, 24 and the wheel 12, a mechanical or hydraulic mechanism 25 for tightening the disc 9.

Advantageously, the disc 9 has a diameter between 25 and 90% of the diameter of the wheel 12.

 According to yet another variant, advantageously used for the practice of cross-country roller-skiing, and illustrated by FIG. 9, the wheels 10, 12 of the

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 skate according to the invention comprises a hub 13 preventing the backward movement of this skate.

 According to this variant also, the shoe comprises means for fixing the heel of the shoe 1 to the plate 2. These fixing means 31 are able to allow the heel of the shoe 1, either to join together (when the fixing means 31 are in the closed position), either to separate (when the fixing means 31 are in the open position), the plate 2, in order to be able to use the skate according to the invention respectively, either for alpine skiing type practice, or for cross-country skiing.

 Still according to this variant, the tip of the shoe 1 is linked to the plate 2 by means of rotation 33 allowing the shoe 1 to pivot relative to the plate 2 between 0 (the shoe 1 rests on the plate 2) and 300 or even 450 (the heel of the shoe 1 is raised relative to the plate 2, as in FIG. 9).

 According to yet another variant, the brake support 6 is formed integrally with the plate 2.

 Similarly, according to yet another variant, the means for fixing the wheels 10, 12 on the plate 2 (consisting, according to the example presented above, of a fixing plate 26) are formed in a single piece with the plate 2.

 According to yet another variant, these fixing means comprise an insert trapped in the material of the plate 2.

 According to another aspect of the skate according to the invention, a set of interchangeable plates 2 is provided, each of these plates having a different length and / or width of fork and / or means for fixing the wheels to a level on the fork different and / or different flexibility, robustness, etc. Thus, the user wishing to change sport discipline and / or surface for the practice of the sport discipline chosen, can adapt the plate and correspondingly the wheels, without changing shoes.

 FIG. 10 schematically represents a particular, but nonlimiting example, of an embodiment of a stick according to the invention.

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 According to this embodiment, the stick comprises a rod 100, a handle 200, a brake handle 300, a guard 400 and a shell 500.

 The stick shown in Figure 10 corresponds to that intended to be taken in the right hand.

 The rod 100 has a conventional shape such as that of ski poles. It is for example made of an aluminum-based alloy.

 The handle 200 is an extension of the rod 100. It has a part in the axis of the rod 100, intended to be in contact with the palm of the hand, and a part deviating from the axis of the rod 100, to which is fixed by cable ties, the brake handle 300.

 The brake handle 300 is conventional and corresponds, for example, overall to the brake handles generally fitted to bicycles.

 The guard 400 is located under the handle 300, between the latter and the rod 100. The guard 400 generally has the shape of a thick washer made of rigid synthetic material. Advantageously, the surface of the guard intended to be in contact with the cutting edge of the user's hand is provided with padding 600. Advantageously also, the surface of the guard 400 on which the cutting edge of the hand rests, is more wide than the contact surface of this cutting edge with the guard 400. This surface is preferably wider than the guard of the poles generally used for skiing, in order to allow more support to be obtained therefrom, since the user has not only a limited possibility of tightening the handle 200 of the stick.

 The shell 500 has a generally semi-cylindrical shape and extends between the guard 400 and the brake handle 300. The shell 500 has an orifice for the passage of a brake cable 38. Advantageously, the shell 500 constitutes, with the guard 400, a single piece. The shell 500 consists of a rigid synthetic material of the type of those in which the knee pads and the elbow pads for protection recommended for the practice of roller skating or skateboarding are generally formed. Advantageously, the shell 500 has on its internal surface, that is to say that directed towards the hand, a padding 600 (advantageously making between

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 0, 5 and 2 cm thick) of foam of the type of that of the above-mentioned knee and elbow pads.

 The shell 500 essentially has the function of protecting the thumb of the user in the event of a fall forward. Indeed, it is well known that during falls forward, skate users fall on the palm of their hands. However, if these users have a stick in their hand, at the time of their fall their palm will press the handle 200 against the wedging ground, if there was not the shell 500, their thumb between the handle 200 and the ground. This thumb could then be broken.

 Many variations can be envisaged using a stick according to the invention, in particular as regards the choice of the materials which constitute it, but also as regards the shape of the guard 400 and the shell 500. For example, the latter could wrap the user's hand more or less than in the embodiment described above in relation to FIG. 10.

 Thus, according to a variant of the stick according to the invention, represented in FIG. 11, the shell 500 has a more closed shape than that presented above, in relation to FIG. 10. In fact, the shell 500 has according to this variant , a wrist protector plate 700 and an envelope 800 to protect the knuckles. In addition, the shell 500 has a reinforcement zone 1000, at the level of the thumb, in order to allow better protection of the latter. Advantageously, when the shell 500 is relatively closed, the latter has ventilation openings.

 Although the stick according to the invention can be advantageously used for the practice of the skate according to the invention, it can also be used with other types of skate.

 The characteristics of the different variants of the skate and the stick according to the invention, presented above are independent of each other and can be combined with one another in multiple ways without departing from the scope of the invention.

Claims (19)

 CLAIMS 1. In-line roller skate comprising a plate (2), this plate (2) comprising a central part (14) forming a platform intended for fixing a shoe (1) and two end parts (18 , 20) on each of which is fixed a wheel (10,12), the plate (2) comprising a single piece capable of elastic deformation of at least one of the end parts (18,20) relative to the part central (14), to allow shock absorption on the wheels (10,12), this shoe being characterized in that the end parts (18,20) extend away from one of the 'other from the central part (14), at an angle, relative to this central part (14), greater than 950 and less than 1750.  2. Skate according to claim 1, characterized in that the plate (2) is made of a material capable of deforming elastically under an acceleration at least equal to 1 G.  3. Skate according to one of the preceding claims, characterized in that the plate (2) consists of a material capable of absorbing at least part of the shocks undergone at the wheels (10,12).  4. Skate according to one of the preceding claims, characterized in that the plate (2) consists of a material comprising a reinforcing element included in the list consisting of glass fibers, carbon fibers and d fibers. aramid.  5. Skate according to one of the preceding claims, characterized in that the plate (2) consists of a material comprising a matrix included in the list consisting of epoxy resins, polyester resins, vinylester resins and polyurethane resins .  6. Skate according to one of the preceding claims, characterized in that the plate (2) consists of a monolithic structure.  7. Skate according to one of the preceding claims, characterized in that the plate (2) consists of a sandwich structure.  8. Skate according to claim 7, characterized in that the structure <Desc / Clms Page number 14>  sandwich contains structural core elements of a material included in the list consisting of wood, compressed structures, acrylic mouses and polyurethane foams 9. Skate according to one of the preceding claims, characterized in that an end part (18, 20) comprises a fork whose branches (22, 24) are adjustable in length to allow mounting, on this part end (18, 20), a wheel (10, 12) of a greater or lesser diameter.

10. Skate according to one of the preceding claims, characterized in that an end portion (18, 20) comprises a fork whose spacing of the branches (22, 24) is adjustable to allow mounting, on this end part (18, 20), of a more or less wide wheel (10, 12). 11. Skate according to one of the preceding claims, characterized in that it comprises a brake shoe (8) capable of clamping a wheel (10, 12) on either side of the plane of rotation of this wheel ( 10, 12). 12. Skate according to one of claims 1 to 10, characterized in that it comprises a disc brake. 13. Skate according to one of the preceding claims, characterized in that the plate has a density between 1, 1 and 1, 7 and more preferably, between 1, 2 and 1, 5. 14. Skate according to one of the preceding claims, characterized in that at least one wheel is provided with a hub (13) not allowing movement of the skate backwards. 15. Skate according to one of the preceding claims, characterized in that it comprises rotation means (33), allowing the shoe (1) to pivot relative to the plate (2). 16. Skate according to one of the preceding claims, characterized in that it comprises fixing means (31) of the shoe (1) on the plate (2), capable of allowing the heel of this shoe (1) to separate from the plate (2), when they are in the open position. 17. Skate according to one of the preceding claims, characterized in that a part of the wheels (10, 12) passes below the shoe (1). 18. Stick for the practice of roller or roller skating comprising <Desc / Clms Page number 15>  a rod (100) provided with a brake handle (300), characterized by the fact that it includes a guard (400) able to allow a user of the stick to press on it cutting it with his holding hand this stick, in order to be able to bear on the latter while having fingers resting on the brake handle (300) but not necessarily applying this brake handle (300).  19. A stick according to claim 18, characterized in that it comprises a shell (500) capable of protecting the hand of the user holding this stick, and more preferably the thumb of this hand.