Bicycle set including seat post and seat clamp

Abstract

A bicycle assembly comprising a seat post (10) and a carriage (20), the post (10) comprising an elongate portion (11) extending along a first axis (A1) and a head at an upper end of the elongate portion (11), the saddle carriage (20) being attached to the head (12) of the seat post (10) at a first longitudinal position which has a first longitudinal offset (D1) in a first direction (S1) of the longitudinal direction (X) relative to the first axis (A1), the saddle carriage (20) further comprising clamping means configured to attach a bicycle saddle to the carriage (20) at a second longitudinal position which has a second longitudinal offset (D2) relative to the first longitudinal position, and wherein the carriage (20) is configured to be attached to the head (12) of the seat post (10) in a removably manner. Abstract Figure: Figure 1

Description

Title of the invention: Bicycle assembly comprising a seat post and a seat rail technical field

[0001] This description relates to a bicycle assembly comprising a seat post and a seat rail. This description also relates to such an assembly further comprising a bicycle saddle. Previous technique

[0002] Typically, a bicycle comprises a saddle and a seatpost. The seatpost comprises a carriage equipped with clamping means in which two rods are clamped, arranged on an underside of the saddle and symmetrically positioned on either side of its longitudinal median plane.

[0003] Depending on the cyclist's body type, the leg muscle groups to be used according to the degree of fatigue, the terrain's gradient, and the intensity of the effort required, the longitudinal position of the saddle can be adjusted by loosening the clamping means and sliding the parallel rods within them. However, such an adjustment of the saddle's longitudinal position is limited by the length of the parallel rods. Therefore, to increase the range of accessible longitudinal saddle positions to suit all body types and uses, it is necessary to increase the length of the parallel rods and thus increase the saddle size, which runs counter to current objectives of weight reduction and compactness in the cycling industry.

[0004] The purpose of this description is, in particular, to provide a simple, economical and effective solution to the problems mentioned above. Summary

[0005] A bicycle assembly is proposed comprising a seatpost and a seatpost clamp, the seatpost comprising a longitudinal portion extending along a first axis and a head at the upper end of the longitudinal portion, the seatpost clamp being fixed to the seatpost head at a first longitudinal position which has a first longitudinal offset along a first direction of the longitudinal direction relative to the first axis, the seatpost clamp further comprising clamping means configured for fixing a bicycle saddle to the clamp at a second longitudinal position which has a second longitudinal offset relative to the first longitudinal position, and wherein the clamp is configured to be fixed to the seatpost head in a removable manner according to: - a first configuration in which the second longitudinal position is offset relative to the first longitudinal position along a second direction of the longitudinal axis; or - a second configuration in which the second longitudinal position is offset from the first longitudinal position in the first direction of the longitudinal direction.

[0006] According to one aspect, the assembly can be such that: - In the first configuration, the carriage is fixed to the head of the seat post according to a first orientation of the longitudinal direction; and - in the second configuration, and the carriage is fixed to the head of the seat post according to a second orientation of the longitudinal direction.

[0007] A portion of the seat post head may have a curvature along the first direction of the longitudinal direction.

[0008] The trolley may include: - first and second external clamping means arranged on each side of the seat post in a transverse direction, the first and second external clamping means having respectively a first clamping surface and a second clamping surface, the first and second clamping surfaces being respectively supported on first and second lower surfaces of the seat post head in opposite directions of the transverse direction, the first and second external clamping means further comprising respectively first and second external jaws, - a fastening mechanism configured so that, when tightened, it clamps each of the first and second clamping surfaces onto the respective lower surface of the seatpost head in the transverse direction in order to removably fix the carriage to the seatpost, - first and second internal clamping means arranged on an upper end of the seat post head, the first and second internal clamping means comprising respectively first and second internal jaws. The first internal jaw and the first external jaw can form a first jaw in which a first saddle rail can be positioned in order to fix it to the carriage when the fastening mechanism is tightened, and The second internal jaw and the second external jaw can form a second jaw in which a second saddle rail can be positioned in order to fix it to the carriage when the fixing mechanism is tightened.

[0009] The first and second clamping surfaces and the first and second lower surfaces of the seat post head can each flare out in a vertical direction.

[0010] The fastening mechanism may include a screw and a nut into which is screwed the screw, the screw and the nut being aligned along a second axis extending in the transverse direction, the screw extending along the second axis through the first external clamping means and the first internal clamping means and the nut extending along the second axis through the second external clamping means and the second internal clamping means.

[0011] The first and second clamping surfaces and the lower surfaces of the seat post can be rounded around a third axis extending in the transverse direction.

[0012] The first and second internal clamping means may each comprise a transverse wall having a lower surface bearing on an upper surface of the seat post head, the lower surface of the transverse wall of each of the first and second internal clamping means and the upper surface of the seat post head being rounded around the third axis.

[0013] The assembly may further include a bicycle saddle attached to the saddle carriage.

[0014] The saddle may further comprise first and second saddle rails, the first and The second saddle rails extend along the longitudinal direction and each comprises a longitudinal portion disposed respectively in the first and second jaws, in which: - the first and second rails are able to slide longitudinally when the fastening mechanism is loosened, and - the first and second rails are fixed to the trolley when the fixing mechanism is tightened.

[0015] According to another aspect, a bicycle is proposed comprising an assembly as described above. Brief description of the drawings

[0016] Other features, details and advantages will become apparent upon reading the detailed description below, and upon analysis of the accompanying drawings, on which:

[0017] [Fig-1] is a perspective view of an assembly comprising a seat post and a cart ;

[0018] [Fig.2] is an exploded view of the entire [Fig.1];

[0019] [Fig.3] is a side view of the whole of [Fig.1] in which the carriage is in a first configuration;

[0020] [Fig.4] is a side view of the whole of [Fig.1] in which the carriage is in a second configuration;

[0021] [Fig.5] is a first cross-sectional view of the entire [Fig.1] and a saddle of bike ;

[0022] [Fig.6] is a second cross-sectional view of the whole of [Fig.1]. Description of the implementation methods

[0023] Reference is now made to Figures 1 to 6, which represent a bicycle assembly comprising a seat post 10 and a seat rail 20. Notably, the assembly may also include a bicycle saddle 100, shown in dotted lines in [Fig. 5].

[0024] In the following description, when reference is made to absolute position qualifiers, such as the terms "front", "back", "top", "bottom", "left", "right", etc., or relative position qualifiers, such as the terms "above", "below", "superior", "lower", etc., or to orientation qualifiers, such as "horizontal", "vertical", etc., reference is made, unless otherwise specified, to the orientation of the figures or of a bicycle in its normal position of use.

[0025] In the following, the longitudinal direction X refers to the longitudinal direction X of the bicycle. This longitudinal direction X corresponds to the normal direction of forward motion of the bicycle. The longitudinal direction X is preferably horizontal. The transverse direction Y is the transverse or lateral direction Y of the bicycle. This transverse direction Y corresponds to a direction perpendicular to the normal direction of forward motion of the bicycle. The transverse direction Y is preferably horizontal. Finally, the vertical direction Z is a vertical direction Z of the bicycle perpendicular to the longitudinal and transverse directions.

[0026] The seat post 10 comprises a longitudinal portion 11 extending along a first axis Al and a head at the upper end of the longitudinal portion 11. The longitudinal portion 11 of the seat post 10 may be tubular, preferably cylindrical of revolution about the first axis AL. The first axis Al may include a component along the vertical direction Z. Optionally, the first axis Al may include a component along the longitudinal direction X, forwards or backwards.

[0027] The seat carriage 20 is fixed to the seatpost head 10 at a first longitudinal position which has a first longitudinal offset DI along a first direction SI of the longitudinal direction X relative to the first axis AL. The seat carriage 20 further includes clamping means configured for fixing a bicycle saddle to the carriage 20 at a second longitudinal position which has a second longitudinal offset D2 relative to the first longitudinal position. Notably shown in Figures 3 and 4, the carriage 20 is configured to be removably fixed to the seatpost head 10 according to: - a first configuration in which the second longitudinal position is offset relative to the first longitudinal position along a second direction S2 of the longitudinal direction X; or - a second configuration in which the second longitudinal position is offset from the first longitudinal position along the first SI direction of the longitudinal X direction.

[0028] The second longitudinal position is thus moved longitudinally according to the chosen configuration, thereby increasing the range of accessible longitudinal positions for a bicycle saddle attached to the carriage 20. In other words, in the first configuration, the first offset DI and the second offset subtract, or even cancel each other out, whereas in the second configuration, the first offset DI and the second offset D2 add up. According to a preferred mode, the seatpost 10 has a shape adapted to form the first offset DI and the carriage 20 has a shape adapted to form the second offset D2.

[0029] In a particular case, the first offset DI and the second offset D2 may be equal. In this particular case, the first offset DI and the second offset D2 cancel each other out in the first configuration. In other words, the attachment of a bicycle saddle to the carriage 20 can be aligned with the first axis Al of the seat post 10.

[0030] The head and the longitudinal portion 11 of the seat post 10 may be structurally distinct, i.e., structurally independent, or may be made from a single piece of material, i.e., one-piece. In the case where they are structurally distinct, the head and the longitudinal portion 11 of the seat post 10 may be connected to each other by any known permanent or removable fastening means, for example, clipping, welding, riveting, or interference fit.

[0031] More specifically, in the first configuration, the carriage 20 is fixed to the head of the seatpost 10 in a first orientation of the longitudinal direction X, and in the second configuration, the carriage 20 is fixed to the head of the seatpost 10 in a second orientation of the longitudinal direction X. This ensures a simple transition between the first and second configurations. The first and second orientations can be in opposite directions of the longitudinal direction X. The first orientation can be in the first direction S1 of the longitudinal direction X, and the second orientation can be in the second direction S2 of the longitudinal direction X. The carriage 20 can be rotated 180° in the longitudinal direction X to switch from the first configuration to the second configuration.

[0032] A portion of the seat post head 10 has a curvature along the first direction SI of the longitudinal direction X. This ensures the first offset DI along the first direction SI of the longitudinal direction X of the first longitudinal position relative to the first axis AL

[0033] The carriage 20 is shown in more detail in Figures 2 and 5. The carriage 20 comprises: - first and second external clamping means 30a; 30b arranged on each side of the seat post 10 in a transverse direction Y, the first and second external clamping means 30a; 30b having respectively a first clamping surface 35a and a second clamping surface 35b, the first and second clamping surfaces 35a; 35b being respectively supported on first and second lower surfaces 13a; 13b of the seatpost head 12 10 in opposite directions of the transverse direction Y, the first and second external clamping means 30a; 30b further comprising respectively first and second external jaws, - a fastening mechanism 50 configured to, when tightened, clamp each of the first and second clamping surfaces 35a; 35b on the respective lower surface 13a; 13b of the seatpost head 12 10 in the transverse direction Y in order to fix the carriage 20 removably on the seatpost 10, - first and second internal clamping means 40a;40b arranged on an upper end of the seat post head 12 10, the first and second internal clamping means 40a; 40b comprising respectively first and second internal jaws.

[0034] The first inner jaw and the first outer jaw form a first jaw 60a in which a first saddle rail 101a can be positioned to fix it to the carriage 20 when the fastening mechanism 50 is tightened. Similarly, the second inner jaw and the second outer jaw form a second jaw 60b in which a second saddle rail 101b can be positioned to fix it to the carriage 20 when the fastening mechanism 50 is tightened. Advantageously, the fastening mechanism 50 is common to the tightening / loosening of the first and second jaws 60a; 60b.

[0035] When the fastening mechanism 50 is loosened, the first inner jaw and the first outer jaw may be further apart than when the fastening mechanism 50 is tightened. Similarly, when the fastening mechanism 50 is loosened, the second inner jaw and the second outer jaw may be further apart than when the fastening mechanism 50 is tightened.

[0036] The first and second external clamping means 30a; 30b may each comprise a side wall 31a; 31b, an upper rim 32a; 32b, and a lower rim 33a; 33b. The side wall 31a; 31b of each of the external clamping means 30a; 30b may extend primarily in the vertical direction Z, and possibly also in the transverse direction Y. The upper rim 32a; 32b may extend in the transverse direction Y from an upper end of the side wall 31a; 31b. The lower rim 33a; 33b may extend in the transverse direction Y from a lower end of the side wall 31a; 31b. The upper rim 32a; 32b and the lower rim 33a; 33b of each external clamping means 30a; 30b can extend from the corresponding lateral wall 31a; 31b in a direction of the transverse Y-direction oriented towards the seatpost head 10. In other words, the upper rim 32a of the first external clamping means 30a and the upper rim 32b of the second external clamping means 30b extend transversely towards each other, and the lower rim 33a of the first external clamping means 30a and the lower rim 33b of the second external clamping means 30b extend transversely towards each other.

[0037] The first and second external jaws may be at least partially formed respectively by the upper rim 32a; 32b of the first and second external clamping means 30a; 30b. More particularly, the first external jaw may be formed by a lower surface 34a, preferably rounded, forming a junction between the upper rim 32a and the side wall 31a of the first external clamping means 30a. Similarly, the second external jaw may be formed by a lower surface 34b, preferably rounded, forming a junction between the upper rim 32b and the side wall 31b of the second external clamping means 30b.

[0038] The first and second clamping surfaces 35a; 35b can be formed by a free end of the lower rim 33a; 33b respectively of the first and second external clamping means 30a; 30b.

[0039] The first and second internal clamping means 40a; 40b may include a side wall 41a; 41b. The side wall 41a; 41b of each of the internal clamping means 40a; 40b may extend mainly in the vertical direction Z. The side wall 41a of the first internal clamping means 40a may be arranged transversely between the first external clamping means 30a, in particular the side wall 31a of the latter, and the seat post head 12 10. Similarly, the side wall 41b of the second internal clamping means 40b may be arranged transversely between the second external clamping means 30b, in particular the side wall 31b of the latter, and the seat post head 12 10.

[0040] A lower portion of the side wall 41a; 41b of each of the first and second internal clamping means 40a; 40b can bear respectively on the first and second lateral edges of the seat post head 10 in the transverse direction Y. In other words, the lower portion of the side wall 41a of the first internal clamping means 40a can bear on the first lateral edge of the seat post head 10 in a first direction SI' of the transverse direction Y and the lower portion of the side wall 41b of the second internal clamping means 40b can bear on the second lateral edge of the seat post head 10 in a second direction S2' of the transverse direction Y.

[0041] The first and second external jaws can be formed by an upper surface of the side wall 41a; 41b of the first and second internal clamping means 40a; 40b, respectively. The upper surface of the side wall 41a; 41b of each of the first and second internal clamping means 40a; 40b can be rounded. The surface upper end of side wall 41a; 41b of each of the first and second internal clamping means 40a; 40b can be disposed at the level of an upper end of the corresponding side wall 41a; 41b.

[0042] The lower surface 34a, forming the junction between the upper rim 32a and the side wall 31a of the first external clamping means 30a, and the upper surface of the first internal clamping means 40a, can be positioned opposite each other 51 so as to form a first longitudinal passage 61a for a first saddle rail 101a. The gap between the lower surface 34a, forming the junction between the upper rim 32b and the side wall 31a of the first external clamping means 30a, and the upper surface of the first internal clamping means 40a, is adjustable by the fastening mechanism 50 to allow or block sliding of the first rail 101a in the longitudinal direction X. In this sense, the lower surface 34a, forming the junction between the upper rim 32a and the side wall 31a of the first external clamping means 30a, and the upper surface of the first internal clamping means 40a, form the first jaw.

[0043] The lower surface 34b, forming the junction between the upper edge 32a and the side wall 31b of the second external clamping means 30b, and the upper surface of the second internal clamping means 40b, can be positioned opposite each other 51 so as to form a second longitudinal passage 61b for a second saddle rail 101b. The gap between the lower surface 34b, forming the junction between the upper edge 32b and the side wall 31b of the second external clamping means 30b, and the upper surface of the second internal clamping means 40b, is adjustable by the fastening mechanism 50 to allow or block the sliding of the second rail 101b in the longitudinal direction X. In this sense, the lower surface 34b, forming the junction between the upper edge 32b and the side wall 31b of the second external clamping means 30b, and the upper surface of the second internal clamping means 40b form the second jaw.

[0044] The first and second longitudinal passages 61a; 61b can be adapted to receive saddle rails with a circular section, for example having a diameter of 7 mm, or to receive saddle rails with an elliptical section, for example having a major axis of 9 mm and a minor axis of 7 mm.

[0045] As shown in [Fig. 5], a first longitudinal plane PI can be defined, that is to say a plane comprising an axis along the longitudinal direction X and an axis along the vertical direction Z, for which: - the first internal clamping means 40a and the first external clamping means 30a are arranged on a first side, and - The second internal clamping means 40b and the second external clamping means 30b are arranged on a second side. The seatpost 10 can be symmetrical with respect to the first plane PL

[0046] The first jaw 60a and the second jaw 60b can be arranged opposite each other along the transverse direction Y. Also, the first jaw 60a and the second jaw 60b can be symmetrical with respect to the first plane PL

[0047] Each jaw can extend longitudinally between a front end and a rear end, thus defining a longitudinal dimension for each jaw. The first and second internal jaws can have the same longitudinal dimension. The first and second external jaws can have the same longitudinal dimension. The longitudinal dimension of the first and second internal jaws can be greater than or equal to the longitudinal dimension of the first and second external jaws.

[0048] A second transverse plane P2, visible in [Fig. 5], can be defined; that is, a plane comprising an axis along the transverse direction Y and an axis along the vertical direction Z, which is medial to the first and second external jaws. The second longitudinal position can correspond to the longitudinal position of the second plane P2.

[0049] The first and second longitudinal passages 61a; 61b can define respective rail axes Ara; ARb extending along the longitudinal direction X. A third plane P3 can be defined which includes the rail axes Ara; ARb of the first and second passages 61a; 61b, and a fourth axis which extends along the transverse direction Y and which is defined by the intersection of the second plane P2 and the third plane P3. In the particular case in which the first offset DI and the second offset D2 are equal, the first axis Al and the fourth axis are intersecting.

[0050] According to another aspect, the first and second clamping surfaces 35a; 35b and the first and second lower surfaces 13a; 13b of the seatpost head 10 each flare out in a vertical direction Z. Thus, when the fastening mechanism 50 is tightened, the clamping of the first and second clamping surfaces 35a; 35b on the respective lower surfaces 13a; 13b of the seatpost head 10 allows for removable fastening in the vertical direction Z. The first and second clamping surfaces 35a; 35b can be chamfered.

[0051] As shown in [Fig. 5], the fastening mechanism 50 comprises a screw 51 and a nut 52 into which the screw is screwed. The screw 51 and the nut 52 are aligned along a second axis A2 extending in the transverse direction Y. The screw 51 extends along the second axis A2 through the first external clamping means 30a and the first internal clamping means 40a, and the nut 52 extends along the second axis A2 through the second external clamping means 30b and the second internal clamping means 40b. Screwing the screw 51 into the nut 52 allows each of the first and second clamping surfaces 35a and 35b to be clamped onto the respective lower surfaces 13a and 13b of the seatpost head 10 in the transverse direction Y in order to secure the carriage 20 removablely on the seat post 10. In other words, the fixing mechanism 50 allows tightening in the first direction SI' of the transverse direction Y of the first external tightening means 30a on the head 12 of the seat post 10, in particular via the screw, and tightening in the second direction S2' of the transverse direction Y of the second external tightening means 30b on the head 12 of the seat post 10, in particular via the nut 52.

[0052] The first and second external clamping means 30a; 30b and the first and second internal clamping means 40a; 40b may each have a hole aligned along the second axis A2 through which the screw 51 or the nut 52 passes, respectively. The hole through the first external clamping means 30a may have a recess in which a head 5la of the screw is housed. The head 5la of the screw 51 may bear in the first direction SI' of the transverse direction Y against an internal shoulder formed by the recess of the first external clamping means 30a.

[0053] The hole through the second external clamping means 30b may have a recess in which a head 52a of the nut 52 is housed. The head 52a of the nut 52 may bear in the second direction S2' of the transverse direction Y on a shoulder formed by the recess of the second external clamping means 30b. The head 52a of the nut 52 may be received by complementary shape in the recess of the second external clamping means 30b in order to immobilize the nut 52 relative to the second external clamping means 30b, which is rotating about the second axis A2.

[0054] Notably shown in [Fig. 2], the first and second clamping surfaces 35a; 35b and the lower surfaces of the seat post 10 are rounded around a third axis A3 extending along the transverse direction Y. This allows rotational adjustment of the carriage 20 relative to the seat post 10 around the third axis A3 when the fastening mechanism 50 is loosened. Thus, it is possible to adjust the inclination of a bicycle saddle attached to the carriage 20. It is possible that the third axis A3 may coincide with the second axis A2.

[0055] The first longitudinal position may correspond to the longitudinal position of a fourth plane P4 defined by the third axis A3 and a vertical axis. The fourth plane P4 may correspond to a median plane of a lower end portion of the first and second external clamping means 30a; 30b, in this case, the respective side walls of the first and second external clamping means 30a; 30b. The second plane P2 may correspond to a median plane of an upper end portion of the first and second external clamping means 30a; 30b, in this case, the respective side walls of the first and second external clamping means 30a; 30b. The second offset D2 may correspond to the distance along the longitudinal direction X that separates the second plane P2 and the fourth plane P4. It is therefore understood that the carriage 20, in particular the first and second external clamping means 30a; 30b, is present a form adapted to allow the second shift D2.

[0056] According to another aspect, as shown in Figures 2 and 6, the first and second internal clamping means 40a; 40b each comprise a transverse wall 42a; 42b having a lower surface 43a; 43b bearing against an upper surface 14 of the seatpost head 12 10, the lower surface 43a; 43b of the transverse wall 42a; 42b of each of the first and second internal clamping means 40a; 40b and the upper surface 14 of the seatpost head 12 10 being rounded around the third axis A3. This allows rotational adjustment about the third axis A3 of the carriage 20 relative to the seatpost 10 when the fastening mechanism 50 is loosened. Thus, it is possible to adjust the inclination of a bicycle saddle attached to the carriage 20. The transverse wall 42a; 42b of each of the first and second internal clamping means 40a; 40b can extend transversely from the side wall 41a; 41b of the corresponding internal clamping means 40a; 40b.

[0057] As previously stated, according to a preferred embodiment, the assembly includes a bicycle saddle 100 attached to the saddle carriage 20. The saddle 100 includes first and second saddle rails 101a; 101b extending along the longitudinal direction X and each comprising a longitudinal portion disposed respectively in the first and second jaws 60a; 60b. The first and second rails 101a; 101b are able to slide longitudinally when the fastening mechanism 50 is loosened, and the first and second rails 101a; 101b are fixed to the carriage 20 when the fastening mechanism 50 is tightened.

[0058] The range of longitudinal positions accessible via the saddle therefore corresponds to: - the possible sliding stroke of the first and second rails 101a; 101b in the first and second jaws 60a; 60b when the carriage 20 is in the first configuration; and - the possible sliding stroke of the first and second rails 101a; 101b in the first and second jaws 60a; 60b when the carriage 20 is in the second configuration.

[0059] It is understood that the first and second saddle rails cannot slide longitudinally in the first and second jaws 60a; 60b when the fixing mechanism 50 is tightened.

[0060] The saddle 100 may include a seat, with the front and rear ends of each of the rails 101a; 101b being fixed to an underside face of the seat.

Claims

1.

2.

3.

4. Claims A bicycle assembly comprising a seat post (10) and a seat carriage (20), the seat post (10) comprising an elongate portion (11) extending along a first axis (A1) and a head at an upper end of the elongate portion (11), the seat carriage (20) being fixed to the head (12) of the seat post (10) at a first longitudinal position which has a first longitudinal offset (D1) in a first direction (SI) of the longitudinal direction (X) relative to the first axis (A1), the seat carriage (20) further comprising clamping means configured to fix a bicycle saddle to the carriage (20) at a second longitudinal position which has a second longitudinal offset (D2) relative to the first longitudinal position, and wherein the carriage (20) is configured to be fixed to the head (12) of the seat post (10) in a removably manner according to: - a first configuration in which the second longitudinal position is offset relative to the first longitudinal position in a second direction (S2) of the longitudinal direction (X); or - a second configuration in which the second longitudinal position is offset relative to the first longitudinal position in the first direction (SI) of the longitudinal direction (X). Assembly according to the preceding claim, in which: - in the first configuration, the carriage (20) is fixed to the head of the seat post (10) according to a first orientation of the longitudinal direction (X); and - in the second configuration, and the carriage (20) is fixed to the head of the seat post (10) according to a second orientation of the longitudinal direction (X). Assembly according to any one of the preceding claims, in which a portion of the head of the seat post (10) has a curvature in the first direction (SI) of the longitudinal direction (X). Assembly according to any one of the preceding claims, in which the carriage (20) comprises: - first and second external clamping means (30a; 30b) arranged on each side of the seat post (10) in a transverse direction (Y), the first and second external clamping means (30a; 30b) respectively having a first clamping surface (35a) and a second clamping surface (35b), the first and second clamping surfaces clamping means (35a; 35b) being respectively supported on first and second lower surfaces (13a; 13b) of the head (12) of the seat post (10) in opposite directions of the transverse direction (Y), the first and second external clamping means (30a; 30b) further comprising respectively first and second external jaws, - a fixing mechanism (50) configured to, when tightened, clamp each of the first and second clamping surfaces (35a; 35b) on the respective lower surface (13a; 13b) of the head (12) of the seat post (10) in the transverse direction (Y) in order to fix the carriage (20) removably on the seat post (10), - first and second internal clamping means (40a; 40b) arranged on an upper end of the head (12) of the seat post (10), the first and second internal clamping means (40a; 40b) being ...40b) comprising respectively first and second internal jaws, wherein the first internal jaw and the first external jaw form a first jaw (60a) in which a first saddle rail (101a) can be positioned in order to fix the latter to the carriage (20) when the fixing mechanism (50) is tightened, and wherein the second internal jaw and the second external jaw form a second jaw (60b) in which a second saddle rail (101b) can be positioned in order to fix the latter to the carriage (20) when the fixing mechanism (50) is tightened.;

5. Assembly according to the preceding claim, in which the first and second clamping surfaces (35a; 35b) and the first and second lower surfaces (13a; 13b) of the head (12) of the seat post (10) each extend in a flared manner in a vertical direction (Z).

6. An assembly according to claim 4 or 5, wherein the fixing mechanism (50) comprises a screw (51) and a nut (52) into which the screw is screwed, the screw (51) and the nut (52) being aligned along a second axis (A2) extending in the transverse direction (Y), the screw (51) extending along the second axis (A2) through the first external clamping means (30a) and the first internal clamping means (40a) and the nut (52) extending along the second axis (A2) through the second external clamping means (30b) and the second internal clamping means (40b).

7. An assembly according to any one of claims 4 to 6, wherein the first and second clamping surfaces (35a; 35b) and the lower surfaces of the seat post (10) are rounded about a third axis (A3) extending in the transverse direction (Y).

8. Assembly according to the preceding claim, in which the first and second internal clamping means (40a; 40b) each comprise a transverse wall (42a; 42b) having a lower surface (43a; 43b) bearing on an upper surface (14) of the head (12) of the seat post (10), the lower surface (43a; 43b) of the transverse wall (42a; 42b) of each of the first and second internal clamping means (40a; 40b) and the upper surface (14) of the head (12) of the seat post (10) being rounded around the third axis (A3).

9. An assembly according to any preceding claim, further comprising a bicycle saddle (100) attached to the saddle carriage (20).

10. An assembly according to the preceding claim, claim 4 applying, the saddle (100) further comprising first and second saddle rails (101a; 101b), the first and second saddle rails (101a; 101b) extending in the longitudinal direction (X) and each comprising a longitudinal portion disposed respectively in the first and second jaws (60a; 60b), wherein: - the first and second rails (101a; 101b) are capable of sliding longitudinally when the fixing mechanism (50) is loosened, and - the first and second rails (101a; 101b) are fixed to the carriage (20) when the fixing mechanism (50) is tightened.