Handle for a rowing machine

Abstract

The invention provides a handle for a rowing machine, comprising: - a tubular body extending along a longitudinal X direction, and having a central portion and two end portions located on either side of the central portion; - two handles, each arranged around an end portion. The body has: - shock-absorbing means designed to prevent impacts with the user's torso, consisting of a central curvature of the central portion of the body contained within a plane defined by the X and Y directions; - means for improving the user's hand posture on the handles, consisting of inclinations of the end portions relative to the central portion, these inclinations being contained within a plane defined by the X and Z directions. Figure for the abstract: Figure 1

Description

Title of the invention: Handle for a rowing machine type exercise machine. Technical field of the invention

[0001] The invention relates to a handle for a weight training device, of the rowing machine type.

[0002] The invention also relates to a method for manufacturing such a handle.

[0003] This is a handle usually attached by a chain or a pull cable to a physical exercise device which consists of making the user reproduce a movement which would make him move if he were not on the device.

[0004] In this case, the exercise equipment consists of a rowing machine that simulates the movements of rowing, a complete sport that works all the muscles of the body. It is also called an indoor rowing ergometer.

[0005] It is widely used for rowing training for basic technique, but also by athletes in other disciplines to improve their physical condition. Technical background

[0006] A rowing machine mainly consists of a rail system on which there is a sliding seat where the user sits, a resistance system which regulates the intensity of the effort to define a level of resistance felt each time the user rows, and a pulling system comprising a cable with a pulley connected to the resistance system and comprising a handle on which the user pulls.

[0007] Several types of rowing machines exist: with air resistance, water resistance or magnetic resistance.

[0008] The rowing machine is an essential tool for professional and amateur rowers who practice rowing. Here is how it is used in this context:

[0009] - Specific training: rowers use the rowing machine to simulate, on the ground, the movements of rowing on the water. This allows them to train in a semi-specific way, working the same muscle groups and developing the technique necessary for competition.

[0010] -Off-season preparation: during periods when access to water is limited (such as in winter), rowers use the rowing machine to maintain their physical condition and improve their technique.

[0011] -Performance tests: Rowing athletes use the rowing machine to assess their performance and physical level, measure their power and monitor their progress over time.

[0012] -Cardiovascular and muscular work: the rowing machine offers a complete workout, engaging the muscles of the upper and lower body, as well as the cardiovascular system.

[0013] For people who frequent a gym, the rowing machine is an excellent choice for various reasons:

[0014] -Versatile training: the rowing machine allows you to work several muscle groups at the same time, including arms, legs, back and abdominals.

[0015] -Cardio and weight loss: Regular use of the rowing machine improves cardiovascular capacity and helps burn calories, thus promoting weight loss.

[0016] -Low impact on joints: unlike some other cardio machines, the rower has minimal impact on the joints, making it suitable for a wide range of people.

[0017] -Group training: In gyms, group rowing classes are popular. They offer a motivating and social experience while improving physical fitness.

[0018] The issue of torso injuries during the use of a rowing machine is an important topic to address. When using a rowing machine, the muscular effort is intense, and the user tends to pull the handle close to their torso, causing repeated impacts to the chest from the handle. This increased stress can lead to torso injuries.

[0019] Another problem with rowing machines is poor posture. Indeed, the handles on a rowing machine are not angled like those on a rowing boat, which can lead to poor posture. The way the user holds the handle can cause tension in the wrists, arms, and shoulders, making the workout more strenuous. This can affect the positioning of the pelvis. Poor pelvic positioning can lead to back pain and compromise the effectiveness of the workout. Summary of the invention

[0020] The objective of the present invention is to overcome the various disadvantages stated above, by means of a handle adapted to the different morphologies of athletes, which take into account in particular the width of the shoulders, the dimensions and shapes of the hands, so that the user has a good posture and does not risk injuring his torso.

[0021] The handle according to the invention is adapted for a weight training device, such as a rowing machine, and conventionally comprises:

[0022] - a tubular body developing mainly along a longitudinal X axis, and featuring a central part and two end parts located on either side of the central part, said central part being equipped with means of attachment to the weight training machine;

[0023] - two handles each arranged around an end part.

[0024] This handle is characterized primarily in that the body has:

[0025] - shock-absorbing means intended to prevent impacts with the user's torso and consisting of a central curvature of the central part of the body, forming a convex boss contained in an XY plane defined by the directions X and Y, the direction Y being perpendicular to the direction X;

[0026] - means of improving the user's hand posture on the handles consisting of inclinations of the end parts with respect to the central part, these inclinations being contained in a plane XZ defined by the directions X and Z, the direction Z being perpendicular to the directions X and Y.

[0027] The main idea of ​​this invention is to design a handle with a specific geometry in its central section, designed to prevent impacts between the handle and the user's body at the end of the rowing stroke. This reduces the risk of injury and discomfort, allowing users to focus on their performance without apprehension. Specifically, this involves shock-absorbing means where the central part of the handle is curved to wrap around the torso instead of coming into contact with it.

[0028] Furthermore, the handle has a particular geometry at the ends, allowing the hands to be angled to promote a more natural and ergonomic grip, and thus improve the user's overall posture on the rowing machine. In this case, it refers to the means of improving hand posture, where the handles are angled.

[0029] According to the different embodiments of the invention, which may be considered together or separately: - the central curvature extends over a length between 18 cm and 30 cm. - the central curvature originates at the junction zones between the central part and each end part, the curvature being symmetrical with respect to the Y axis passing through the center of the handle and being defined by two angles a with respect to the X direction. - angle a is 30°. - the inclinations are symmetrical with respect to the Z axis passing through the center of the handle and are defined by two angles [3 with respect to the X direction. - angle [3 is defined between 10° and 90°. - angle [3 is 12°. - angle [3 is 45°. - angle [3 is 90. - the body section is oval. - the handle has means of adjusting its length consisting of wedges arranged in the grips. - the handle includes means of locking the grips against rotation relative to the body. - said means of rotation blocking include spacers arranged between the body and the handles and fixed to the body, said handles and spacers having corresponding shapes suitable for fitting together longitudinally to ensure the rotation blocking function. - the body presents means of improving transmission consisting of a central curvature of the central part of the body in an XZ plane.

[0030] The invention also relates to a method for manufacturing a handle as described above, comprising the following steps:

[0031] - manufacturing of the bare plastic body;

[0032] - coating the body with one or more carbon sheaths bonded to the body by application of one or more layers of epoxy resin, then drying;

[0033] - sanding of the body;

[0034] - installation of the fastening means in the central part of the body;

[0035] - insertion and fixing of two spacers on the two end parts of the body;

[0036] - insertion of the two handles onto the two spacers according to an angular orientation precise and with rotation lock;

[0037] - tightening the handles on the spacers for axial locking along the X direction. Brief description of the figures

[0038] Other features and advantages of the invention will become apparent upon reading the detailed description that follows, for an understanding of which reference should be made to the accompanying drawings in which:

[0039] Fig. 1 is a perspective view of a handle according to the invention.

[0040] Fig. 2 is an exploded and perspective view of the handle according to Fig. 1.

[0041] [Fig.3] is a view of the handle in an XY plane according to [Fig.1].

[0042] Fig. 4 is a view of the handle body in the XY plane according to Fig. 3.

[0043] Fig. 5 is a view of the handle in an XZ plane according to Fig. 1.

[0044] Fig. 6 is a view of the handle body in the XZ plane according to Fig. 5.

[0045] Figure 7 includes figures 7a to 7c which are side and front views of a spacer according to the invention.

[0046] Fig. 8 is a view of the section along AA as defined in Fig. 5.

[0047] Figure 9 includes figures 9a to 9k which illustrate the different manufacturing stages of a handle according to the invention.

[0048] Fig. 10 shows the handle installed on a rowing machine.

[0049] Fig. 11 shows three possible configurations of the handle according to the invention.

[0050] Fig. 12 shows another embodiment of the handle according to the invention, according to a view of the body in an XZ plane.

[0051] Fig. 13 shows the body according to Fig. 12 in an XY plane. Detailed description of the invention

[0052] In the following description, longitudinal, transverse and vertical orientations indicated by the right trihedron "X,Y,Z" in the figures will be adopted in a non-limiting manner - and without reference to terrestrial gravity.

[0053] By convention, the "axial" direction corresponds to that of main extension of the handle, illustrated by the X direction.

[0054] Figures 1 and 2 show a handle 1 according to the invention intended to be fixed on a rowing machine type strength training device.

[0055] This handle 1 comprises a tubular body 2 developing mainly along a longitudinal X direction, and two gripping handles 3 placed at the ends of the body 2.

[0056] In the prior art, this handle 1 is generally straight.

[0057] In the context of the present invention, the handle 1 is not straight but has a very specific geometry.

[0058] In this case, the body 2 of the handle 1 has several curves allowing to solve several technical problems as explained in the first part of the description.

[0059] More specifically, the body 2 has a central part 2a and two end parts 2b located on either side of the central part 2a. The central part 2a is provided with means for fixing 4 to the weight training apparatus.

[0060] The central portion 2a is curved to present a domed shape, i.e., a convex bulge. It is this central portion 2a that comes close to the user's torso when rowing and reaching the end of the pulling cycle. This central curvature thus forms shock-absorbing means designed to prevent impacts with the user's torso.

[0061] As can be seen more clearly in Figures 3 and 4, the central part 2a has a central curvature which extends in an XY plane defined by the X and Y directions.

[0062] The central curvature originates at the junction zones 2c between the central part 2a and each end part 2b. It has a smooth shape and follows the generally rounded shape of a user's torso.

[0063] The central part 2a with the curvature extends over a length L3, illustrated in [Fig.4], preferably between 18 cm and 30 cm, which corresponds approximately to the width of a user's torso.

[0064] In a preferred example, the length L3 is between 18 cm and 20 cm.

[0065] The objective is for this central part 2a to surround the torso.

[0066] Indeed, the depth P of the curvature, illustrated in [Fig. 4], results in a shift in the point of impact with the torso. Thus, for the same movement with the same stroke of the user's arms, the point of impact between the central part 2a of the handle 1 and the torso will be shifted by the equivalent of the depth P of the curvature, thereby automatically reducing the number of impacts with the torso.

[0067] Preferably the depth P of the curvature is between 1.5 cm and 4 cm.

[0068] Preferably, the curvature is defined by two angles a of 30° with respect to the direction X.

[0069] The curvature is symmetrical with respect to the Y axis passing through the center of the handle 1.

[0070] The end portions 2b of the handle 1 are inclined relative to the central portion 2a. These inclinations constitute means of improving the posture of the user's hands on the handles 3.

[0071] As can be seen more clearly in Figures 5 and 6, the inclinations of the end parts 2b extend in a plane XZ defined by the directions X and Z.

[0072] The two inclinations take place at the level of the two junctions 2c between the end parts 2b and the central part 2a.

[0073] The inclinations are symmetrical with respect to the Z axis passing through the center of the handle 1.

[0074] Each inclination is defined by an angle [3] between 10° and 90° with respect to the direction X.

[0075] In Figures 1 to 10, the inclination [3] is approximately 12° with respect to the X direction. This inclination is similar to that of a boat's oars. This inclination optimizes the rower's hand position, promoting a more natural and ergonomic grip. It contributes to more efficient power transmission and reduced fatigue.

[0076] This configuration with an angle of 12° is also illustrated in the upper part of [Fig. 11]. This is a first configuration.

[0077] According to a second possible configuration, as illustrated in the central part 2a of [Fig. 1 1], the inclination [3] is of the order of 45° with respect to the direction X. This inclination makes it possible to increase the pulling force and to limit the amplitude of internal rotation of the shoulder, thus reducing the biomechanical risk factors in terms of wear.

[0078] According to a third possible configuration, as illustrated on the lower part of [Fig. 1 1], the inclination [3 is of the order of 90° with respect to the direction X. This inclination corresponds to a so-called neutral position, which also allows the wrist to be kept in a neutral position throughout the pulling movement, thus reducing the repetition of radio-ulnar deviation of the wrist, which also limits the risks of wear.

[0079] The handle 1 according to the invention thus has a dual geometry extending in two different planes, namely the curvature of the central part 2a in the XY plane, and the inclinations of the end parts 2b in the XZ plane. This dual geometry makes it possible to solve problems related to torso injuries and poor posture.

[0080] Advantageously, the handle 1 includes means for adjusting its length. Indeed, users have different shoulder widths, and it is therefore important that the handle 1 adapts to the shoulder width to optimize posture and, consequently, optimize the pulling effort on the rowing machine.

[0081] The length adjustment means consist of wedges 13, illustrated in [Fig.9i], arranged inside the handles 3, in the bottom of the handles 3, and which allow the longitudinal position of the handles 3 on the handle 1 to be modified.

[0082] When no wedge 13 is installed, the bottom of the handle 3 butts directly against the end of the body 2. This is the configuration in which the length L1 of the handle 1 (see [Fig.3]) is the shortest, and corresponds to the length L2 of the body 2 (see [Fig.6]).

[0083] To increase the length L1 of the handle 1, there are different lengths of shims 13 which are therefore arranged in the bottom of the handle 3. The shim 13 is then sandwiched between the bottom of the handle 3 and the end of the body 2. Two identical shims 13 are arranged in the two handles 3 to ensure symmetry. The length L1 of the handle 1 increases by the length of the two added shims 13.

[0084] According to the invention, each rower can install its own handles 3 on the body 2, that is to say, handles 3 adapted to its specific preferences and needs. These are ergonomic handles 3 specific to each rower.

[0085] It is also possible to install standard 3 handles.

[0086] Regardless of which handles 3 are installed, it is necessary to provide means of locking the handles 3 against rotation relative to the body 2, so that the handles 3 remain firmly in place when the rower pulls hard on the handle 1.

[0087] According to one possibility, the rotation-locking means comprise spacers 5 disposed between the body 2 and the handles 3, and fixed to the body 2. The spacers 5 and handles 3 have corresponding shapes to ensure the function of locking against rotation.

[0088] For example, these corresponding forms may consist of a longitudinal groove provided on one of the spacer 5 and the handle 3, suitable for cooperating with a longitudinal rib provided on the other of the spacer 5 and the handle 3. The rib slides inside the groove when the handle 3 is inserted longitudinally onto the spacer 5.

[0089] According to a preferred example, the spacer 5 has a single longitudinal rib, while the handles 3 have several longitudinal grooves. This allows the handle 3 to be angularly indexed when it is placed on the spacer 5. In other words, the user chooses the groove according to the angle they wish to give the handle 3 relative to the spacer 5, particularly if it is an ergonomic handle 3.

[0090] Such a spacer 5 is illustrated in particular in figures 7a, 7b and 7c.

[0091] This is a tubular sleeve which is positioned around an end part 2b of the body 2, and which has a longitudinal rib 5a which extends over the entire length of the spacer 5.

[0092] On [Fig.8], we can see the internal shape of the ergonomic handle 3, with in particular the plurality of longitudinal grooves 3a, one of them cooperating with the longitudinal rib 5a of the spacer 5.

[0093] The handle 3 is made of a flexible material, in order to absorb the stresses of the hand when pulling, while the body 2 is made of a rigid material to resist tensile forces.

[0094] The handle 3 thus placed on the spacer 5 is blocked in rotation relative to the spacer 5 and a fortiori relative to the body 2.

[0095] It is also preferable to block the handle 3 in translation relative to the spacer 5 and a fortiori relative to the body 2.

[0096] To achieve this, the spacer 5 has a closed end with a threaded hole 5d (see Figures 7a to 7c) into which a screw 7 can be inserted. For assembly, the screw 7 passes successively through an opening provided in the bottom of the handle 3, then through the wedge 13, and finally through the threaded hole 5d in the spacer 5.

[0097] In addition, the handle 1 has a flange 6 at each handle 3, which surrounds the end of the handle 3 opposite the bottom. This flange 6 is tightened by means of a screw 11 / nut 12 system which compresses the handle 3 onto the spacer 5.

[0098] The handle 3 is then securely locked longitudinally on the handle 1.

[0099] For example, body 2 may have an oval external section. Similarly In this way, the spacer 5 may have an oval internal section 5b, visible in [Fig. 7c]. Thus, when the spacer 5 is inserted around the body 2, it is automatically locked. rotates relative to body 2 thanks to its oval shape. To fix the spacer 5 longitudinally relative to body 2, glue is used.

[0100] The external section 5c of the spacer 5 is round, as is the internal section of the handle 3, hence the need to provide the means of locking against rotation discussed previously.

[0101] The handle 1 can be manufactured by any conventional manufacturing system.

[0102] In particular, the body 2 can be molded in a rigid material, such as metal or carbon.

[0103] According to another technique, the body 2 can be designed by additive manufacturing, in a plastic material for example, and then reinforced using different layers of carbon.

[0104] In this case, here are the different manufacturing steps of the handle 1, as illustrated in figures 9a to 10.

[0105] Step 1: Printing of body 2 ([Fig.9a])

[0106] Printing of body 2 in PLA (plastic) on an additive manufacturing (FDM) machine. The sole purpose of body 2 is to give the handle 1 the desired shape, therefore it is thin. Preferably, its thickness is around 0.8 mm to limit the mass, while remaining rigid enough to facilitate the subsequent fitting of the carbon sheath. This body 2 is designed using CAD software.

[0107] Step 2: Carbon fiber coating (figures 9b, 9c, 9d)

[0108] Coating of this body 2 with carbon sheath: four layers of sheath Carbon fibers are threaded along the entire length of body 2, then two additional layers are added in the middle (the area of ​​greatest stress). These layers are bonded with epoxy resin. A peel ply wraps the entire assembly to control the amount of resin and to adhere the carbon fiber layers to each other and to body 2. The purpose of this process is to provide sufficient mechanical strength to withstand the most severe impacts.

[0109] After the drying time of 24 hours, the peel ply is removed, the carbon ends protruding from the core are sawn off, and the handle 1 is sanded to obtain a smooth surface.

[0110] Step 3: varnishing (figure 9e)

[0111] A resin coating is applied twice to the body 2 to achieve a fine finish. The body 2 is first sanded by hand from 120 grit to 1000 grit, a first extremely thin coat of resin is applied, and after a drying time of 24 hours, the body 2 is sanded by hand from 240 grit to 10000 grit, and a second thin coat of resin is applied. The drying time is again 24 hours, and a final wet sanding from 1000 grit to 10000 grit is carried out. This results in a carbon body 2 in the shape we want thanks to the 3D printed geometry with a smooth surface.

[0112] Step 4: drilling ([Fig.9f])

[0113] Holes 10 are drilled in the middle of the body 2 to allow a ring 4a to pass through, which connects to the rower's chain. These holes 10 are correctly positioned using a drill guide: they are centered with respect to the ends and with respect to the diameter.

[0114] Step 5: Nut cover ([Fig.9g])

[0115] Since the nuts 9 of the ring 4a are visible, a nut cover 4b made of PLA is 3D printed: this cover is designed using CAD software. It is a safety feature to prevent users from injuring their chest. It is fixed between the nuts 9 and the body 2.

[0116] Step 6: Spacers 5 ([Fig.9h])

[0117] To accommodate the handles 3, which can be mounted and dismounted, a connecting piece between the carbon body 2 and these handles 3 is required: this piece is the spacer 5. It is also designed using CAD software and 3D printed in PLA. The spacers 5 are glued to the handle 1 with epoxy resin and positioned using guides to ensure perfect symmetry. Their external shape matches that of the oars to allow for the attachment of any handle 3 and to allow for adjustment of its angle and width.

[0118] Step 7: Installation of handles 3 (figures 9i, 9j, 9k)

[0119] Four grooves 3a are provided inside the handle 3, and a rib 5a is provided outside the spacer 5. Each groove 3a provides a different angular orientation of the handle 3 relative to the body 2.

[0120] The handles 3 are slid around the spacers 5 at the angle the user desires, i.e. with a selected groove 3a of the handle 3 cooperating with the rib 5a of the spacer 5.

[0121] Shims 13 can be inserted into the bottom of the handles 3 to adjust the grip width. The handle 3 is secured by a flange 6 with a screw-nut system that tightens everything to prevent the handle 3 from rotating (the handle 3 must not rotate even without tightening thanks to the groove-rib design). An axial screw 7 is positioned for additional security to prevent the handle 3 from slipping; it screws into a hole 5d in the spacer 5 provided for this purpose. A plug 8 is fitted to conceal the screw 7.

[0122] Step 8: Installation of handle 1 on the rower ([Fig. 10])

[0123] The user chooses whether to attach their handle 1 directly to the ring 4a in In which case, he must pass ring 4a through the end of the chain and then insert ring 4a into handle 1 and nut cover 4b. Nuts 9 are tightened, placed in the correct position. direction to fit into the housings of the nut cover 4b. When the chain is under tension, the nuts 9 fit inside the nut cover 4b.

[0124] If the user wants to use the carabiner for more mobility of the handle 1, he only has to leave the ring 4a on the handle 1 and then clip the carabiner into the end of the chain.

[0125] Figures 12 and 13 show another embodiment of the invention, with a handle which has a more complex central curvature, which develops in two planes.

[0126] The central curvature in the XY plane is found which helps to avoid shocks, as illustrated in [Fig. 13], and which is the counterpart of [Fig.4] of the first embodiment.

[0127] In addition, there is a central curvature in the XZ plane which allows the centers of the hands (points A and B) to be aligned with the attachment point of the handle (point C), as illustrated in [Fig. 12], which is the counterpart of [Fig. 6] of the first embodiment.

[0128] More specifically, there is an alignment of the perpendicular bisector of segment AB with the axis of the chain of the indoor rowing ergometer for better transmission.

[0129] In summary, the body 2 has means for improving transmission consisting of a central curvature of the central part 2a of the body 2 in a plane XZ.

[0130] This central curvature in the XZ plane originates at the junction zones 2c between the central part 2a and each end part 2b, the curvature being symmetrical with respect to the Z axis passing through the center of the handle 1 and being defined by two angles y with respect to the X direction.

[0131] the angle y is preferably 12°.

[0132] The entire description relating to the first embodiment concerning Figures 1 to 10 is valid for the embodiment of these Figures 12 and 13.

[0133] The configurations shown in the cited figures are only possible examples, by no means limiting, of the invention which on the contrary encompasses variants of forms and designs within the reach of a person skilled in the art.

Claims

Demands

1. Handle (1) for a rowing machine, comprising: - a tubular body (2) developing mainly along a longitudinal X direction, and having a central part (2a) and two end parts (2b) located on either side of the central part (2a), said central part (2a) being provided with means for attachment (4) to the rowing machine; - two handles (3) each arranged around an end part (2b); characterized in that the body (2) has: - shock-absorbing means intended to prevent impacts with the user's torso and consisting of a central curvature of the central part (2a) of the body (2), forming a convex boss contained in an XY plane defined by the X and Y directions, the Y direction being perpendicular to the X direction;- means of improving the posture of the user's hands on the handles (3) consisting of inclinations of the end parts (2b) with respect to the central part (2a), these inclinations being contained in a plane XZ defined by the directions X and Z, the direction Z being perpendicular to the directions X and Y.;

2. Sleeve (1) according to the preceding claim, characterized in that the central curvature extends over a length L3 of between 18 cm and 20 cm.

3. Handle (1) according to any one of the preceding claims, characterized in that the central curvature originates at the junction zones (2c) between the central part (2a) and each end part (2b), the curvature being symmetrical with respect to the Y axis passing through the center of the handle (1) and being defined by two angles a with respect to the X direction.

4. Handle (1) according to the preceding claim, characterized in that the angle a is 30°.

5. Handle (1) according to any one of the preceding claims, characterized in that the inclinations are symmetrical with respect to the Z axis passing through the center of the handle (1) and are defined by two angles [3 with respect to the X direction.

6. Sleeve (1) according to the preceding claim, characterized in that the angle [3 is defined between 10° and 90°.

7. Sleeve (1) according to any one of claims 5 to 6, characterized in that the angle [3 is 12°.

8. Sleeve (1) according to any one of claims 5 to 6, characterized in that the angle [3 is 45°.

9. Handle (1) according to any one of claims 5 to 6, characterized in that the angle [3 is 90°.

10. Handle (1) according to any one of the preceding claims, characterized in that it comprises means for adjusting its length consisting of wedges (13) arranged in the handles (3).

11. Sleeve (1) according to any one of the preceding claims, characterized in that the cross-section of the body (2) is oval.

12. Handle (1) according to any one of the preceding claims, characterized in that it comprises means for locking the handles (3) against rotation relative to the body (2).

13. Handle (1) according to the preceding claim, characterized in that said rotation-locking means comprise spacers (5) disposed between the body (2) and the handles (3) and fixed to the body (2), said handles (3) and spacers (5) having corresponding shapes suitable for fitting together longitudinally to ensure the rotation-locking function.

14. Handle (1) according to any one of the preceding claims, characterized in that the body (2) has transmission improvement means consisting of a central curvature of the central part (2a) of the body (2) in an XZ plane.

15. A method for manufacturing a handle (1) according to any one of the preceding claims, characterized in that it comprises the following steps: - manufacturing the bare plastic body (2); - coating the body (2) with one or more carbon sheaths bonded to the body (2) by applying one or more layers of epoxy resin, then drying; - sanding the body (2); - installing the fastening means (4) in the central part (2a) of the body (2); - inserting and fixing two spacers (5) on the two end parts (2b) of the body (2); - insertion of the two handles (3) onto the two spacers (5) according to a precise angular orientation and with rotation lock; - tightening the handles (3) on the spacers (5) for axial locking along the X direction.

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