Seat post assembly

Abstract

The present invention relates to a seating post assembly comprising: a seating post (1) slidably mounted in a riser (20); a rod (17) extending inside the seat post (1); a base (6) attached to the upper end of the post (1); a saddle support (10) mounted on the base (6) and to which a saddle (18) can be attached; and a locking system actuatable between an unlocked position, in which the locking system does not prevent the seating post (1) from sliding, and a locked position, in which the locking system locks the position of the seating post (1) inside the riser (20). The locking system is actuated by moving the rod (17), and the seat support (10) is rotatably mounted on the base (6) and is connected to the rod (17) in such a way that rotation of the seat support (10) moves the rod (17).

Description

Technical Field

[0001] The invention relates to a seat post assembly, which can be mounted on a bicycle in particular.

[0002] More specifically, the present invention relates to a seat post assembly equipped with a locking system that enables the height of the seat post to be varied and fixed. Background Art

[0003] There are many locking systems for bicycle seatposts.

[0004] A locking system for a bicycle seat post (also for the stem) comprising a connecting rod extending inside the seat post and a wedge connected to the connecting rod. The connecting rod is able to move between a low position, in which the wedge does not oppose the sliding of the seat post inside the stem surrounding it, and a high position, in which the wedge opposes this sliding and locks the seat post in place. An exemplary system of this type is described in patent document FR 2432424. Such a locking system is appreciated for its robustness and reliability. However, the operations required to lock and unlock the system are not easy and usually require tools. This disadvantage is acceptable in cases where the height of the seat post is adjusted once and for all to the size of its only user. In contrast, this disadvantage quickly becomes troublesome in cases where the height of the seat post must be adjusted frequently, as in the case of a bicycle shared between multiple users. This disadvantage also becomes troublesome when the seat post must be frequently retracted as far as possible into the stem to reduce the volume of the bicycle, as is the case with most folding bicycles.

[0005] Therefore, there is a need for a seat post locking system that is easy to operate and does not require any tools. Summary of the invention

[0006] The seat post assembly according to the present invention comprises:

[0007] - a seat post adapted to be slidably mounted in the seat tube,

[0008] - a connecting rod extending inside the seat post, the connecting rod being movable relative to the seat post between a low position and a high position,

[0009] - a base fastened to the upper end of the seat post,

[0010] a seat support to which a saddle can be fastened, the seat support being mounted on the base, and

[0011] - a locking system actuable between an unlocked position in which it does not prevent the sliding of the seat post inside the seat tube and a locked position in which it prevents the sliding and locks the position of the seat post inside the seat tube.

[0012] The locking system is actuated by movement of the connecting rod between its high and low positions.

[0013] The seat support is rotatably mounted on the base about a first axis and is connected to the connecting rod such that rotation of the seat support about the first axis drives the connecting rod between a high position and a low position of the connecting rod.

[0014] Thus, when the saddle is fastened to the seat support, it is sufficient for the user to pivot the saddle (and with it the seat support) about the first axis to lock and unlock the locking system. The required operation is therefore particularly easy.

[0015] In some embodiments, the seat support is connected to the connecting rod by a lever, the lever being pivotally mounted on the base about a second axis, the first arm of the lever extending on one side of the second axis and connected to the connecting rod to drive the connecting rod between a high position and a low position of the connecting rod, and the second arm of the lever extending on the other side of the second axis and driven to rotate about the second axis by the rotation of the seat support about the first axis. Such a lever connection has the advantages of being simple and robust. In addition, by adjusting the length of the arm of the lever, the lever is able to amplify the force applied by the user. Thus, a moderate force is sufficient to drive the connecting rod between a high position and a low position of the connecting rod and thereby lock and unlock the locking system.

[0016] The invention also relates to a vehicle comprising a seat post assembly as defined above, a frame having a stem tube, the seat post being slidably mounted in said stem tube, and a saddle fastened to a seat support. The vehicle may be a bicycle or any other vehicle equipped with a saddle.

[0017] The above features and advantages and other features and advantages will become apparent from a reading of the following detailed description which refers to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are schematic and not necessarily drawn to scale, primarily for the purpose of illustrating the principles of the invention. In the accompanying drawings, the same element (or part of an element) is identified from one figure to another by the same reference numeral.

[0019] [ Figure 1]The figure depicts an example of a seat post assembly including a locking system for locking the position of the seat post within the seat tube.

[0020] [ Figure 2 ]The picture is Figure 1 Exploded view of the seat post assembly in the .

[0021] [ Figure 3 ]The picture is Figure 1 . The seat post is engaged in the seat tube and is equipped with a saddle. The saddle is in its use position, and the upper surface of the saddle is substantially horizontal.

[0022] [ Figure 4 ]This figure is related to Figure 3 A similar cross-sectional view wherein the saddle is upright, with the upper surface of the saddle being nearly vertical.

[0023] [ Figure 5 ]The figure is similar to Figure 3 A cross-sectional view of a saddle with the saddle tilted toward the rear. The saddle is inverted with its upper surface facing downward.

[0024] [ Figure 6 ]This figure is a detailed view of another example of a locking system.

[0025] [ Figure 7 ]The picture is Figure 6 Exploded view of the locking system in the.

[0026] [ Figure 8 ]The picture is Figure 6 Axial cross-sectional view of the locking system in the unlocked position.

[0027] [ Fig. 9 ]The picture is Figure 6 Axial cross-sectional view of the locking system in the locked position. DETAILED DESCRIPTION

[0028] Specific embodiments of the proposed seat post assembly will be described in detail below with reference to the examples shown in the accompanying drawings. These embodiments illustrate the features and advantages of the present invention. However, it should be noted that the present invention is not limited to these embodiments.

[0029] In certain embodiments, such as the example depicted in the figures, the seat post assembly comprises a seat post 1 designed to be able to slide in a seat tube 20 after installation. The upper end 1A of the seat post 1 carries a seat support 10 to which a saddle 18 is fastened. Figure 3 The saddle 18 in its use position is depicted. In this position, the user sits on the upper surface 18S of the saddle 18.

[0030] In this application, if Figure 3As depicted, horizontal and vertical directions are defined relative to the use position of the saddle 18. The upper surface 18S of the saddle is substantially horizontal in the use position. Top and bottom are defined relative to the vertical direction. Front and rear are defined relative to the horizontal direction and the normal position of the user on the saddle 18, with the user facing forward.

[0031] In the example shown in the figures, the saddle 18 comprises fastening rails 19 on its lower surface. These rails 19 extend in the length direction of the saddle 18. The rails 19 are held in jaws 4 provided on both sides of the seat support 10. These jaws 4 are clamped around the rails 19 by means of screws 3. This fastening system complies with current standards so that most commercially available saddles with rails can be fastened to the seat support 10. Of course, other fastening systems for fastening the saddle 18 to the seat support 10 can be envisaged.

[0032] The seat post assembly further comprises a locking system 2 for locking the position of the seat post 1 inside the seat tube 20 , and a connecting rod 17 extending inside the seat post 1 and connected to the locking system 2 .

[0033] The connecting rod 17 can be relative to the seat post 1 Figure 4 The low position shown is Figure 3 and Figure 5 Move between high positions shown.

[0034] The locking system 2 is actuated by the movement of the connecting rod 17 between its high position and its low position. The locking system 2 can be actuated between an unlocked position, in which it does not prevent the sliding of the seat post 1 inside the stem 20, and a locked position, in which it prevents this sliding and locks the position of the seat post 1 inside the stem 20.

[0035] In this example, when the connecting rod 17 is in the low position, the locking system 2 is in the unlocked position and does not prevent the seat post 1 from sliding inside the seat tube 20, and when the connecting rod 17 is in the high position, the locking system 2 is in the locked position and prevents this sliding and locks the position of the seat post 1 inside the seat tube 20. Therefore, the high position and the low position of the connecting rod 17 correspond to the unlocked position and the locked position of the locking system 2, respectively. However, the opposite correspondence can be envisioned without departing from the scope of the present invention.

[0036] In some embodiments, as in the example depicted in the figures, the connecting rod 17 passes through the seat post 1 and the lower end 17B of the connecting rod 17 extends beyond the lower end 1B of the seat post 1. The locking system 2 is fastened to the lower end 17B of the connecting rod 17, so that the connecting rod 17 drives a part of the locking system 2 in its movement, thereby actuating the locking system 2.

[0037] In some embodiments, the locking system 2 includes a wedge 30, and the lower end 1B of the seat post 1 is angled along an inclined plane 31, which forms a non-zero angle with a plane perpendicular to the main axis X of the seat post 1, for example, an angle between 30° and 60°. The wedge 30 is supported by the connecting rod 17 and has an inclined surface 30A facing the inclined plane 31. When the connecting rod 17 moves from its low position to its high position, the connecting rod 17 pulls the wedge 30 upward, so that the inclined surface 30A is squeezed and slides against the inclined plane 31, causing the wedge 30 to deflect relative to the main axis X of the seat post 1. The wedge 30 then presses against the inner wall of the seat tube 20 and pushes the seat post 1 against the opposite inner wall, as shown in FIG. Figure 3 and Figure 5 The friction force generated prevents the seat post 1 from sliding inside the seat tube 20 and thus locks the position of the seat post 1 .

[0038] In the present application, a wedge or wedge refers to a movable mechanical member capable of applying a locking force in an assembly of components to lock the relative movement between these components. In this case, a wedge 30 enables locking the relative movement between the seat post 1 and the stem 20 .

[0039] Refer to the following Figures 6 to 9 Another example of a locking system 2 is described. These examples of locking systems 2 have the advantage of being robust and reliable. In particular, they are more reliable than systems that use a collar to clamp the stem and press the stem against the seat post.

[0040] The seat post assembly further comprises a base 6 fastened to the upper end 1A of the seat post 1. In this example, the base 6 comprises a sleeve 26 engaged and fastened in the upper end 1A of the seat post 1. The seat support 10 is mounted rotatable about the first axis 11 on the base 6 and is connected to the connecting rod 17, so that rotation of the seat support 10 about the first axis 11 drives the connecting rod 17 between its high position and its low position.

[0041] In some embodiments, such as in the example shown in the figures, the upper part of the base 6 extends from the seat post 1 (i.e., from the sleeve 26) towards the rear. The upper part of the base 6 has a front wall forming or carrying the hook 16 and two side walls terminating in two arms 6A towards the rear. The upper part of the base 6 is hollow, without a lower wall and a rear wall.

[0042] The rear portion 10B of the seat support 10 is mounted so as to be rotatable between the two arms 6A about the first axis 11. In this way, the seat support 10 can make a relative rotational movement with respect to the base 6.

[0043] In this example, the first axis 11 is an axis of rotation realized by two screws 11A, which are arranged facing each other in the same direction. These screws 11A are screwed into the arm 6A from the outside. They pass through the thickness of the arm 6A and are housed in a cylindrical hole passing through the rear part 10B of the seat support 10. The screws together form an axle (in two parts) on which the seat support 10 is carried so as to pivot.

[0044] Of course, other configurations for realizing the articulation between the seat support 10 and the base 6 can be envisaged. For example, two spindles can extend on both sides of the rear portion 10B of the seat support 10 and be supported by two bearings formed in the arm 6A, respectively. According to another example, the first rotation axis 11 can be an axis (single-piece) passing through the seat support 10 and the arm 6A.

[0045] According to another example, the first rotation axis 11 is not realized by any component and is only an imaginary straight line about which the rotation movement is performed. In the latter case, the articulation between the seat support 10 and the base 6 is realized, for example, by fitting a circular groove in a circular rib.

[0046] In some embodiments, the seat support 10 is connected to the connecting rod 17 by means of a lever 7, which is mounted to be pivotable about the second axis 8 on the base 6. The lever 7 comprises two arms extending on both sides of the second axis 8. A first arm 7A of the lever extends on one side of the second axis 8 and is connected to the connecting rod 17 so as to drive the connecting rod 17 between a high position and a low position of the connecting rod 17. A second arm 7B of the lever extends on the other side of the second axis 8 and is driven to rotate about the second axis 8 by the rotation of the seat support 10 about the first axis 11.

[0047] In this example, the second axis 8 is an axis of rotation realized by a shaft passing through the lever 7 and supported by two bearings formed in the lateral walls of the base 6. However, other configurations can be envisaged for the articulation of the lever 7. For example, the second axis of rotation 8 can be formed by two spindles extending on both sides of the lever 7. The lever 7 can be pierced by a perforation 9 through which the second axis 8 can pass.

[0048] In some embodiments, the first arm 7A of the lever is longer than the second arm 7B. Furthermore, the lever 7 may have a curved shape, the second axis 8 being located at the bend of the lever 7 .

[0049] In some embodiments, the lever 7 is housed inside the base 6, between its lateral walls (i.e. between the arms 6A). Likewise, the upper end 17A is housed inside the base 6, the connecting rod 17 passing through the sleeve 26. Thus, the mechanism of the locking system is protected from external impacts. It is also out of reach of the user, which makes it possible to avoid the risk of jamming.

[0050] In some embodiments, the upper end 17A of the connecting rod 17 passes through the first arm 7A of the lever 7 and has an upper stopper 27A and a lower stopper 27B on both sides of the first arm 7A, and when the connecting rod 17 is in a high position, the first arm 7A abuts against the upper stopper 27A, and when the connecting rod 17 is in a low position, the first arm 7A abuts against the lower stopper 27B. In other words, when the first arm 7A is raised, it abuts against the upper stopper 27A and pulls the rod 27 upward. Conversely, when the first arm 7A is lowered, it abuts against the lower stopper 27B and pushes the rod 27 downward. In the example shown in the figure, the stoppers 27A, 27B have the shape of a collar, and the end of the first arm 7A forms a fork. The fork is engaged between the stoppers 27A, 27B around the rod 27.

[0051] In certain embodiments, such as the example depicted in the figures, the seat support 10 is rotatably movable about the first axis 11 between the following three positions, namely:

[0052] a carrying position, which corresponds to the use position of the saddle 18 , in which the seat support 10 is in the normal position, carried on the base 6 ;

[0053] an inverted position, in which the seat support 10 is tilted towards the rear of the base 6 ; and

[0054] - An intermediate position between the carrying position and the inverted position.

[0055] These three locations are Figure 3 , Figure 5 and Figure 4 Depicted in.

[0056] exist Figure 3 In the embodiment, the seat support 10 is in the carrying position, and the saddle 18 is in its use position. The upper surface 18S of the saddle is substantially horizontal to allow a user to sit on it.

[0057] exist Figure 4 In the embodiment shown in FIG. 1 , the seat support 10 is in a middle position, the saddle 18 is upright, and the upper surface 18S of the saddle is nearly vertical.

[0058] exist Figure 5 In the embodiment, the seat support 10 is in an inverted position. The support 10 and the saddle 18 are tilted toward the rear. The saddle is inverted, and its upper surface 18S becomes downward.

[0059] The connecting rod 17 is in a high position when the seat support 10 is in the carrying position, in a low position when the seat support 10 is in the intermediate position, and in a high position again when the seat support 10 is in the inverted position.

[0060] In some embodiments, the seat support 10 (in this case, the rear portion 10B of the seat support 10) carries the pin 12. Furthermore, an oblong opening 13 is provided in the second arm 7B of the lever 7. The oblong opening 13 and the seat support 10 are configured such that the pin 12 moves in and along the oblong opening 13 during rotation of the seat support 10 about the first axis 11. The movement of the pin 12 in the oblong opening 13 then causes the lever 7 to pivot about the second axis 8, as shown in FIG. Figures 3 to 5 shown.

[0061] The pin 12 describes a circular path during the rotation of the seat support 10 about the first axis 11. In this example, the elongated opening 13 is curved in the same direction as the circular path, the curvature of the elongated opening 13 being smaller than the curvature of the circular path of the pin 12.

[0062] Refer to the following Figures 3 to 5 Describe the operation of the locking system.

[0063] When the seat support 10 is in the load-bearing position, the pin 12 is located at the first end of the long strip opening 13. Figure 3 As shown. The second arm 7B of the lever 7 is then in the low position and, conversely, the first arm 7A is in the high position. The first arm 7A abuts against the upper stop 27A of the connecting rod 17 and pulls the connecting rod 17 upwards. The connecting rod 17 is then in the high position and the locking system 2 is locked: the position of the seat post 1 inside the seat tube 20 is locked.

[0064] In some embodiments, in order to keep the seat support 10 in the carrying position, the seat support 10 may be equipped with a coupling system that enables the seat support to be coupled to the base 6. For example, the seat support 10 may be equipped with a hook 5 that engages with another hook 16 carried by the base 6. The hook 5 may be held in the engaged position by a compression spring 14. In order to disengage the hook 5 from the other hook 16, the user exerts a force on the hook 5 that is opposite to the force of the spring 14. To make the operation easier, the hook 5 may be equipped with a tab or tongue that the user can press to disengage or unhook the hook 5. The hook 5 may be mounted so as to be rotatable on the seat support 10 about the axis 15. Of course, other coupling systems for coupling the seat support 10 to the base 6 may be envisaged. For example, the other hook 16 may be replaced by an opening provided in the base 6 and in which the hook 5 hooks.

[0065] To unlock the locking system 2, the user unhooks the hook 5 and lifts the saddle 18 (and with it the seat support 10) until Figure 4The pin 12 then moves towards the middle of the elongated opening 13 and this lifts the second arm 7B of the lever 7. The second arm 7B of the lever 7 is then in the high position and, conversely, the first arm 7A is in the low position. The first arm 7A comes into contact with the lower stop 17B of the connecting rod and pushes the connecting rod 17 downwards. The connecting rod 17 is then in the low position and the locking system 2 is unlocked: the seat post 1 is free to slide inside the stem 20. This freedom of movement is Figure 4 and Figure 8 It is schematically shown by double arrows.

[0066] In the case of a conventional (i.e. non-folding) bicycle, particularly in the case of a bicycle shared by multiple users, once the locking system 2 is unlocked, the height of the saddle 18 can be adjusted to the size of its new user. Once the height of the saddle 18 has been adjusted, the saddle 18 can be adjusted to its original position. Figure 3 The saddle 18 is folded into the use position in order to lock the locking system 2 and the position of the saddle 18.

[0067] In the case of a folding bicycle, once the locking system 2 has been unlocked, the seat post 1 can be retracted (i.e. lowered) as far as possible into the seat tube 20 in order to limit the dimensions of the bicycle in the folded position. Once the seat post 1 has been retracted, the saddle 18 can be moved toward its original position. Figure 3 Fold forwardly in the use position in order to lock the locking system 2 and lock the saddle 18 in the locked position.

[0068] As a variant, the saddle 18 (and with it the seat support 10) may be oriented towards Figure 5 The inverted position shown is tilted towards the rear. The pin 12 then moves towards the second end of the elongated opening 13, which lowers the second arm 7B of the lever 7. The second arm 7B of the lever 7 is then in the low position and, conversely, the first arm 7A is in the high position. The first arm 7A abuts against the upper stop 17A of the connecting rod and pulls the connecting rod 17 upwards. The connecting rod 17 is then in the high position and the locking system 2 is locked: the position of the seat post 1 inside the seat tube 20 is locked.

[0069] The saddle 18 is tilted toward the rear, toward the Figure 5 The possibility of the inverted position shown is optional. This possibility has advantages for folding bicycles, such as described in patent document EP 3634842 B1, in which the saddle is tilted towards the rear in order to reduce the size of the folded bicycle as much as possible. See document EP 3634842 B1. Figure 7 B. In this case, when the saddle 18 is in the inverted position ( Figure 5) The fact that the locking system 2 is locked when the folding system 2 is in the folded position allows the user to operate the folded bicycle by holding the folded bicycle by the saddle 18 when necessary. This also makes it possible to transport the folded bicycle without the risk of the seat post 1 coming out of the stem 20.

[0070] The pin 12 and the elongated opening 13 are examples of a drive system for driving the lever 7. Other drive systems can be envisaged. For example, in some embodiments (not shown), the seat support 10 carries a cam, which is driven to rotate about the first axis 11 by the rotation of the seat support 10 about the first axis 11, and the second arm 7B of the lever 7 is pressed against the outer contour of the cam. The second arm 7B then acts as a cam follower. The rotation of the cam about the first axis 11 makes it possible to raise or lower the second arm 7B of the lever 7.

[0071] exist Figures 6 to 9 Another example of a locking system 2 is shown in FIG. Figure 1 and Figure 2 The locking system 2 comprises: a lower cone 32 connected to the lower end 17B of the connecting rod 17; an upper cone 33 fastened to the lower end 1B of the seat post 1, the vertices of the lower cone and the upper cone facing each other; and a plurality of wedges 34 arranged circumferentially around the connecting rod 17 between the cones 32, 33.

[0072] When the connecting rod 17 moves from its low position to its high position, the connecting rod 17 pulls the lower cone 32 upward, bringing the lower cone and the upper cone closer together and sandwiching the wedge 34 therebetween, thus causing the wedge 34 to move radially away from the connecting rod 17. The wedge 34 then abuts against the inner wall of the seat tube 20. The friction force generated prevents the seat post 1 from sliding within the seat tube 20 and thus locks the position of the seat post 1.

[0073] In some embodiments, Figures 6 to 9 As depicted, the upper cone 33 is pierced at its center to allow the connecting rod 17 to slide.

[0074] The lower cone 32 and the upper cone 33 have inclined surfaces 32A and 33B of a conical overall shape, respectively. The wedge 34 is beveled along inclined surfaces 34A, 34B at its upper and lower portions.

[0075] The wedge 34 may be held together and around the connecting rod 17 by a resilient ring 35 around it. To this end, a groove 37 may be provided on the outer surface of the wedge 34 to accommodate the ring 35.

[0076] In the unlocked position ( Figure 8 ), when the connecting rod 17 is in the low position (corresponding to Figure 4), the elastic ring 35 holds the wedge 34 close to the connecting rod 17, and the seat post 1 is free to slide inside the seat tube 20.

[0077] During the lockdown period ( Fig. 9 ), when the connecting rod 17 moves from the low position to the high position (such as Figure 3 and Figure 5 33B), the lower cone 32 moves closer to the upper cone 33. With the inclined surfaces 34A and 34B abutting against the inclined surfaces 32A and 33B, respectively, the wedge 34 moves radially away from the connecting rod 17 (i.e., in a direction perpendicular to the axis of the connecting rod 17) and abuts against the inner wall of the seat tube 20. The friction force generated prevents the seat post 1 from sliding within the seat tube 20 and thus locks the position of the seat post 1.

[0078] The outer surface of the wedge 34 may have a radius of curvature in a radial plane that is substantially the same as the radius of curvature of the inner wall of the riser 20 in order to maximize friction.

[0079] The presence of the grooves 37 on the outer surface of the wedge 34 makes it possible to avoid or limit friction forces at the elastic ring 35. As a result, the wear of the elastic ring 35 is reduced.

[0080] The embodiments described in the present disclosure are given in an exemplary rather than limiting manner, and those skilled in the art can easily modify these embodiments or conceive other embodiments based on the present disclosure while remaining within the scope of the present invention.

[0081] In particular, if some features of the embodiments described above are sufficient in themselves to achieve an advantage of the present invention, those skilled in the art will be able to easily envision variations that include only these features. In addition, the various features of these embodiments can be used alone or in combination with each other. When combined, these features can be combined as described above or in other ways, and the present invention is not limited to the specific combinations previously described. In particular, unless otherwise stated, the features described with respect to one embodiment can be applied to another embodiment in a similar manner.

Claims

1. A seat post assembly, comprising: A seat post (1) adapted to be slidably mounted in a seat tube (20); a connecting rod (17) extending inside the seat post (1), the connecting rod (17) being movable between a low position and a high position relative to the seat post (1); A base (6) which is fastened to the upper end (1A) of the seat post (1); a seat support (10) to which a saddle (18) can be fastened, the seat support (10) being mounted on the base (6); as well as a locking system (2) which can be actuated between an unlocked position in which the locking system (2) does not prevent the seat post (1) from sliding inside the seat tube (20) and a locked position in which the locking system (2) prevents the sliding and locks the position of the seat post (1) inside the seat tube (20), wherein the locking system (2) is actuated by the movement of the connecting rod (17) between its high position and its low position, and The seat support (10) is rotatably mounted on the base (6) about a first axis (11) and is connected to the connecting rod (17) so that rotation of the seat support (10) about the first axis (11) drives the connecting rod (17) between a high position and a low position of the connecting rod (17).

2. The seat post assembly according to claim 1, wherein: The seat support (10) is connected to the connecting rod (17) via a lever (7), the lever (7) being pivotally mounted on the base (6) around a second axis (8), a first arm (7A) of the lever (7) extending on one side of the second axis (8) and connected to the connecting rod (17) to drive the connecting rod (17) between a high position and a low position of the connecting rod (17), and a second arm (7B) of the lever (7) extending on the other side of the second axis (8) and being driven to rotate around the second axis (8) by the rotation of the seat support (10) around the first axis (11).

3. The seat post assembly according to claim 2, wherein: The seat support (10) carries a pin (12), and wherein an elongated opening (13) is provided in the second arm (7B) of the lever (7), the elongated opening (13) and the seat support (10) being configured such that during rotation of the seat support (10) around the first axis (11), the pin (12) moves within and along the elongated opening (13), the movement of the pin (12) within the elongated opening (13) causing the lever (7) to pivot around the second axis (8).

4. The seat post assembly according to claim 3, wherein: The pin (12) describes a circular path during rotation of the seat support (10) around the first axis (11), and wherein the elongated opening (13) is curved in the same direction as the circular path, the curvature of the elongated opening (13) being smaller than the curvature of the circular path of the pin (12).

5. The seat post assembly according to claim 2, wherein: The seat support (10) carries a cam which is driven in rotation about the first axis (11) by the rotation of the seat support (10) about the first axis (11), and wherein the second arm (7B) of the lever (7) is pressed against the outer contour of the cam.

6. The seat post assembly according to any one of claims 2 to 5, wherein: The upper end portion (17A) of the connecting rod (17) passes through the first arm (7A) of the lever (7) and has an upper stopper (27A) and a lower stopper (27B) on both sides of the first arm (7A). When the connecting rod (17) is in the high position, the first arm (7A) abuts against the upper stopper (27A), and when the connecting rod (17) is in the low position, the first arm (7A) abuts against the lower stopper (27B).

7. The seat post assembly according to any one of claims 1 to 6, wherein: When the connecting rod (17) is in the high position, the locking system (2) is in the locking position, and when the connecting rod (17) is in the low position, the locking system (2) is in the unlocking position.

8. The seat post assembly of claim 7, wherein: The seat support (10) is capable of rotating about the first axis (11) between the following three positions, namely: a carrying position corresponding to the use position of the saddle (18), wherein the seat support (10) is in a normal position and is carried on the base (6); an inverted position, wherein the seat support (10) is tilted toward the rear of the base (6); and ； in an intermediate position between the carrying position and the inverted position, and Wherein, the connecting rod (17): When the vehicle seat support (10) is in the load-bearing position, it is in the high position; When the seat support (10) is in the intermediate position, it is in the low position; and When the vehicle seat support (10) is in the inverted position, it is in the high position again.

9. The seat post assembly according to any one of claims 1 to 8, wherein: The locking system (2) comprises: a lower cone (32) connected to the lower end portion (17B) of the connecting rod (17); an upper cone (33) fastened to the lower end portion (1B) of the seat post (1), the apexes of the lower cone and the upper cone facing each other; and a plurality of wedges (34) arranged circumferentially around the connecting rod (17) between the lower cone and the upper cone (32, 33), When the connecting rod (17) moves from its low position to its high position, the connecting rod (17) pulls the lower cone (32) upward, so that the lower cone and the upper cone are closer together and the wedge (34) is clamped therebetween, thereby causing the wedge to move radially away from the connecting rod (17).

10. The seat post assembly according to any one of claims 1 to 8, wherein: The lower end portion (1B) of the seat post (1) is inclined along an inclined plane (31), and the inclined plane (31) forms a non-zero angle with a plane perpendicular to the main axis (X) of the seat post (1), wherein the locking system (2) includes a wedge (30) having an inclined surface (30A) facing the inclined plane (31), and wherein, when the connecting rod (17) moves from its low position to its high position, the connecting rod (17) pulls the wedge (30) upward, so that the inclined surface (30A) is squeezed and slides against the inclined plane (22), thereby causing the wedge (30) to be offset relative to the main axis (X) of the seat post (1).

11. A vehicle comprising a seat post assembly according to any one of claims 1 to 10, a frame having a stem (20) in which the seat post (1) is mounted so as to be able to slide, and a saddle (18) fastened to a seat support (10).

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