Gardening tricycle

Abstract

Title: Gardening Tricycle The invention relates to a gardening tricycle (100) comprising: means (500) for generating motor torque, including a crankset (510); a frame (200) on which the crankset (510) and a saddle (110) are mounted; a rear running gear (300), the running gear (300) comprising: an axle (310) extending along a principal axis (A); two wheels (320) each mounted at one end of the axle (310), in which the tricycle (100) also includes a gardening tool (900) designed for cutting plants. Figure for the abstract: Fig. 1

Description

Title of the invention: Gardening tricycle

[0001] The field of the invention is that of the design and manufacture of gardening vehicles.

[0002] More specifically, the invention relates to a tricycle equipped with a gardening tool.

[0003] In the field of the invention, the lawnmower tricycle described in the patent document published under number FR2360238A1 is known.

[0004] This tricycle includes a front wheel and a rear motorized assembly comprising two wheels.

[0005] The tricycle is equipped with a mowing device associated with the front wheel and driven in motion by means of a roller pressed against the front wheel.

[0006] Such a tricycle makes it possible to mow the lawn without using a petrol engine causing noise and environmental pollution.

[0007] The tricycle described in the patent document published under number US4455816A1 is also known.

[0008] This tricycle includes a front steering wheel, a rear axle comprising two drive wheels driven by a pedal assembly, and tools for mowing, mounted on the rear axle.

[0009] The tricycles described above, although allowing for the mowing of a lawn, have the disadvantage of being potentially uncomfortable to use, or even risky in the case where the ground to be mowed is not flat and horizontal.

[0010] Moreover, it may be regrettable that only mowing a field is possible with such tricycles.

[0011] The invention aims in particular to overcome the drawbacks of the prior art.

[0012] More specifically, the invention aims to provide a gardening tricycle that is easier and safer to use than gardening tricycles according to the prior art.

[0013] The invention also aims to provide such a tricycle which has a greater diversity of use than is offered by the prior art.

[0014] The invention further aims to provide such a tricycle enabling a user to move up steep slopes safely and comfortably.

[0015] These objectives, as well as others that will appear subsequently, are achieved thanks to the invention, which relates to a gardening tricycle comprising: - means for generating a motor torque including a pedal assembly; - a frame on which the crankset and a saddle are mounted; - a rear running gear, the running gear comprising: - an axle extending along a main axis; - two wheels mounted at one end of the axle, in which the tricycle also includes a gardening tool designed for cutting plants,

[0016] characterized in that the rear running gear is pendular, the axle being mounted rotationally on the chassis along an axis of rotation extending transversely to the main axis and along a general direction of forward advancement of the tricycle,

[0017] and in that the gardening tool is mounted on the running gear and has, relative to the chassis, a mobility dependent on a degree of rotation of the running gear around the axis of rotation relative to the chassis.

[0018] Thanks to its pendulum-type rear axle, the gardening tricycle according to the invention is easier and safer to use than gardening tricycles according to the prior art. Indeed, the pendulum-type rear axle allows the tricycle to adapt to curved terrain, or even to sloping terrain.

[0019] In addition, thanks to the mounting of the gardening tool on the pendulum running gear, and the mobility of this gardening tool in relation to the chassis, the gardening tool then performs its work while being oriented in a way adapted to the slope and the terrain on which the tricycle moves.

[0020] Preferably, the gardening tool is operated by the pedal.

[0021] The gardening tool is thus set in motion as soon as the tricycle moves across the ground.

[0022] According to a first embodiment, the gardening tool includes grass cutting elements located between the two wheels of the running gear.

[0023] Thanks to this embodiment, the tricycle allows mowing a field in a simple and safe way for the tricycle user, even if the field is inclined.

[0024] According to a second embodiment, which can be associated with the previous first embodiment, the gardening tool includes aerial plant cutting elements and forms a hedge trimmer intended to extend transversely to a horizontal plane.

[0025] The gardening tricycle can then be used to trim a hedge. The gardening tricycle must then be piloted in such a way as to move parallel to the hedge.

[0026] This is particularly advantageous because, thanks to the mobility of the gardening tool depending on a degree of rotation of the running gear relative to the support, the cutting elements of aerial plants can always present the same angle relative to a vertical axis (for example, maintaining a zero angle to verticalize the cutting elements) regardless of the slope of the ground on which the tricycle moves, and even if the slope changes as the tricycle moves forward.

[0027] According to a preferred feature, the cutting elements and the wheels of the running gear are coupled to the pedal assembly via transmission means, the means transmission incorporating a set of gears configured to increase the actuation frequency (or in other words, operating frequency) of the cutting elements relative to a rotation speed of the pedal assembly, and decrease the rotation frequency of the wheels of the running gear.

[0028] This ensures proper operation of the cutting elements.

[0029] According to a preferred embodiment, the running gear comprises a wheel verticalization mechanism formed by: - a main crown for each wheel, the wheel being mounted freely to rotate on its crown; - a connecting rod support mounted movably to rotate at one end on the chassis, around the axis of rotation; - a crankshaft mounted to rotate freely at a second end of the support; - a set of bars, for each wheel, the set of bars comprising at least one group of at least three parallel bars not in a single common plane, the set of bars being mounted pivotally on the main ring of said wheel around axes parallel to the axis of rotation R, and pivoting on the crankshaft around axes parallel to the axis of rotation R.

[0030] This mechanism allows the wheels of the running gear to be parallelized while tending to keep them vertical despite the tricycle's movement on uneven terrain. Among other things, the crankshaft distributes the loads equally on the left and right sides of the tricycle, and consequently, on each of the wheels.

[0031] Advantageously, the wheel verticalization mechanism includes an intermediate ring located between each wheel and the crankshaft, and centered on the main axis, and the bar assembly includes for each wheel: - a proximal group of the crankshaft consisting of at least three parallel bars extending between the crankshaft and the intermediate ring; - a group distant from the crankshaft by at least three parallel bars extending between the main ring and the intermediate ring.

[0032] These intermediate rings make it possible to limit the bulk of the parallel bars by keeping part of these parallel bars in the vicinity of the axle for the bars of the distant group.

[0033] Preferably, each intermediate ring carries an axle bearing, this bearing being mounted to rotate freely on the intermediate ring around an axis parallel to the axis of rotation R and intersecting with the main axis A of the axle.

[0034] This allows an equal distribution of the loads from the parallelized proximal bars of the crankshaft, and promotes balance to tend to prevent the wheels from lying on the ground.

[0035] Preferably, the chassis comprises: - a fixed frame extending in a single plane, called the frame plane, in which the axis of rotation is inscribed, the saddle and the crankset being mounted on the fixed frame; - a secondary frame extending in the plane of the frame, the secondary frame being deformable in the plane of the frame, in which the secondary frame comprises: - a first steering bearing mounted pivoting on the fixed frame, in the plane of the frame; - two sliding longitudinal members mounted on pivot points supported by the fixed frame; - a second coupled steering bearing that rotates on both side members; the first steering bearing and the second steering bearing receiving a steering shaft associated with a steering wheel.

[0036] This design allows the front / backward tilt of the fixed frame, the saddle, and a handlebar coupled to the steering axis to be adapted when the tricycle goes up or down a slope.

[0037] Other features and advantages of the invention will become more apparent from the following description of a preferred embodiment of the invention, given by way of illustrative and non-limiting example, and the accompanying drawings described below.

[0038] [Fig-1] The [Fig.1] is a schematic rear perspective representation of a tricycle according to a first embodiment;

[0039] [Fig.2] Fig.2 is a schematic rear-perspective representation of a tricycle according to a second embodiment;

[0040] [Fig.3] Fig.3 is a schematic representation viewed from the side of the tricycle of the [Fig.2];

[0041] [Fig.4] Fig.4 is a schematic representation centered on a crankset and a part of the tricycle's transmission means;

[0042] [Fig. 5] The [Fig. 5] is a schematic perspective representation centered on a wheel of a running gear of the tricycle of the [Fig.l].

[0043] Figures 1 to 3 illustrate 100 gardening tricycles according to the invention.

[0044] The 100 gardening tricycle comprises a 200 chassis and a 300 rear running gear. The 100 tricycle also includes a 400 steering wheel, a 110 saddle, and 500 means of generating engine torque.

[0045] As described below, the tricycle 100 also includes a gardening tool 900 designed for cutting plants, this tool including cutting elements 910.

[0046] According to the present embodiments, the means for generating 500 of a motor torque include a pedal assembly 510.

[0047] According to other conceivable embodiments, the means for generating 500 of a motor torque could also include an electric motor, for example designed to provide pedaling assistance.

[0048] The 510 crankset and the 110 saddle are mounted on the 200 frame.

[0049] The rear 300 running gear is of the pendulum type, and is rotationally mounted on the chassis 200.

[0050] More specifically, the running gear 300 comprises an axle 310, and two wheels 320.

[0051] As illustrated in [Fig.1], the axle 310 extends along a main axis A.

[0052] The two wheels 320 are mounted at the ends of the axle 310.

[0053] The axle 310 is thus mounted for rotation on the chassis 200 along an axis of rotation R extending transversely to the main axis A and along a general direction of forward advancement of the tricycle 100.

[0054] According to the embodiment, the rotation axis R is secant with the main axis A. However, it is conceivable, according to other embodiments, that the rotation axis R is not secant with the main axis A, and in particular that the main axis A passes over the rotation axis R, that is to say that it overhangs the rotation axis R.

[0055] With reference to [Fig. 5], each wheel 320 comprises: - a 321 rim; - a 322 tire mounted on the 321 rim.

[0056] The running gear 300 also includes a main ring 610 for each wheel 320. This main ring 610 forms a support for the wheel 320.

[0057] The wheel 320 is thus mounted freely to rotate on its main ring 610.

[0058] More specifically, the running gear 300 includes a raceway interposed between the rim 321 and the main ring.

[0059] The running gear 300 further includes a transmission system 611 between each end of the axle 310 and the rims 321, this transmission system 611 including, among other things, a right-angle pinion mounted for rotation about a pivot axis 612 carried by the main ring 610 and extending parallel to the axis of rotation R.

[0060] With reference to figures 1, 2, 4 and 5, the running gear 300 also includes: - a support 620; - a crankshaft 630 supported by the support 620; - a set of bars, for each wheel 320, coupling the main crowns 610 to the crankshaft 630.

[0061] The support 620 forms a connecting rod.

[0062] This support 620 comprises two parts extending parallel to each other, along an axis perpendicular to the axis of rotation R, between a first end and a second end of the support 620.

[0063] The support 620 is mounted movable for rotation at its first end on the chassis 200, around the axis of rotation R.

[0064] The crankshaft 630 is mounted to rotate freely on the second end of the support 620. The crankshaft 630 is in particular mounted to rotate freely relative to the support 620 around an axis parallel to the axis of rotation R.

[0065] The bar assembly of each wheel 320 comprising at least one group of at least three parallel bars 600 not in a single common plane, the bar assembly being pivotally mounted on the main ring 610 of said wheel about axes parallel to the axis of rotation R, and pivoting on the crankshaft 630 about axes parallel to the axis of rotation R.

[0066] With at least three parallel bars 600 not inscribed in a single common plane, the set of bars makes it possible to transmit forces on at least three support points, while maintaining a predefined angle between the two planes in which the pivot points of the bars located at one end of said group of bars, and the pivot points of the bars located at the other end of said group of bars, are respectively inscribed.

[0067] According to the present embodiments, the tricycle 100 further comprises an intermediate ring 640 located between each wheel 320 and the crankshaft 630, and centered on the main axis A.

[0068] As can be seen in figures 1 and 5, this intermediate ring 640 accommodates within it a disc 330 forming a bearing for the axle 310.

[0069] The disc 330 is mounted movably in rotation on the intermediate ring 640 around an axis parallel to the axis of rotation R and intersecting with the main axis A of the axle 310.

[0070] The disk 330 extends orthogonally to the main axis A.

[0071] Furthermore, as can be seen in Figures 1, 2, 4 and 5, the bar assembly comprises for each wheel 320: - a proximal group 650 of the crankshaft 630 of at least three parallel bars 600 extending between the crankshaft 630 and the intermediate ring 640; - a group 660 distant from the crankshaft 630 of at least three parallel bars 600 extending between the main ring 610 and the intermediate ring 640.

[0072] In addition, a lower bar 680 extends between the two intermediate rings 640, under the axle 310.

[0073] All the parallel bars 600, and the lower bar 680, are coupled at their ends by links allowing pivoting around axes parallel to the axis of rotation R.

[0074] As identified in [Fig. 5], the running gear 300 comprises at least one cross member 670 between two parallel bars 600 whose distal pivot joints with respect to the axis of rotation R are collinear and whose proximal pivot joints with respect to the axis of rotation R are collinear. This cross member 670 is designed to allow only pivoting of the parallel bars 600 in planes that are orthogonal to the axis of rotation R. Preferably, the running gear 300 comprises two cross members 670 located on either side of the crankshaft.

[0075] According to one conceivable embodiment, the bar assembly of each wheel 320 may comprise a single group of parallel bars 600 extending from the crankshaft 630 to the main ring 610. In this case, the tricycle might not include a disc 330.

[0076] More generally, the running gear 300 includes a wheel verticalization mechanism 320 formed by the main ring 610, the support 620, the crankshaft 630, and the bar assembly.

[0077] The bars of two proximal groups of the bar assembly, each coming from the left and right wheels, converge, in an equally distributed manner, towards the crankshaft, a part on which the loads associated with each of the wheels compensate and neutralize each other to produce a first type of equilibrium, that of the loads on the left side of the chassis on the loads on the right, and vice versa.

[0078] With reference to Figures 1 and 4, the tricycle includes transmission means 700 designed to allow the transmission of motor torque from the generation means 500. The transmission means 700 include, among other things, a set of gears 710, as well as the axle 310. By way of example, the transmission means 700 may include other elements such as a belt.

[0079] The gear assembly 710 is at least partially accommodated within the support 620, and mounted freely to rotate relative to the support 620.

[0080] According to the present embodiments, the cutting elements 910, and the wheels 320 of the running gear 300 are coupled to the pedal assembly 510 via the transmission means 700.

[0081] The transmission means 700 are configured in particular to increase the actuation frequency of the cutting elements 910 relative to a rotation speed of the pedal assembly 510, and to decrease the rotation frequency of the wheels 320 of the running gear 300.

[0082] According to one envisaged embodiment, the transmission means 700 incorporate independent gearboxes for the actuation of the cutting elements 910, and for the drive of the wheels 320.

[0083] With reference to Figures 1 and 4, the transmission means 700 also incorporate a differential 720 located along the axle 310. This allows the rotational speed of the wheels 320 to be adjusted when the tricycle 100 turns.

[0084] The chassis 200 is now described with reference to figures 1 and 3.

[0085] According to the present embodiment, the chassis 200 comprises: - a fixed frame 210, the saddle 110 and the crankset 510 being mounted on the fixed frame; - a secondary frame 220 which is deformable.

[0086] The fixed frame 210 extends in a single plane, hereinafter referred to as the "frame plane". The axis of rotation R lies in the frame plane.

[0087] The secondary frame 220, for its part, extends in the plane of the frame and is deformable in the plane of the frame.

[0088] According to one possible embodiment, the chassis 200 could comprise only a fixed frame.

[0089] As illustrated in [Fig.3], the fixed frame 210 comprises a verticalized tube 211, or tending to be verticalized, and an inclined tube 212, integral with the verticalized tube, and extending upwards from the verticalized tube.

[0090] The saddle 110 is carried at the interface between the vertical tube 211 and the inclined tube 212.

[0091] The 510 crankset is mounted at the lower end of the vertical tube 211.

[0092] The vertical tube 211 has two joints 230 on which, as this is As detailed later, the secondary frame is mounted to move in rotation, as well as to move in translation.

[0093] The secondary frame 220 comprises two longitudinal members 223 mounted to slide on pivot points carried by the fixed frame 210. These pivot points are formed by the joints 230.

[0094] The longitudinal members are mounted on the secondary frame 220 so that they are always parallel to each other.

[0095] The secondary frame also includes: - a transmission casing tube 224 centered on the axis of rotation R, coupled to the lower end of the verticalized tube 211 by a first pivot link housing the crankset 510; - a second pivot link 225 located at a front end of the casing tube 224, opposite a rear end of the casing tube 221 associated with the running gear 300; - a parallel tube 226, mounted on the second pivot joint 225 at a lower end and extending parallel to the vertical tube 211 to an upper end coupled to one of the longerons by means of a sliding pivot joint, the longeron 223 being mounted sliding and pivoting at the upper end of the parallel tube 226; - a first steering bearing 221 mounted pivotally on the fixed frame 210, in the plane of the frame; - a second steering bearing 222 coupled movable to rotation on the two longitudinal members 223.

[0096] In the preferred design described above, the first pivot joint housing the crankset contributes to the balance of the cyclist in the plane of the fixed frame and the moving frame.

[0097] The first steering bearing 221 and the second steering bearing 222 receive a steering shaft 410 associated with a steering wheel 400.

[0098] The tricycle 100 also has a handlebar 420 at the level of the first steering bearing 221. This handlebar 420 is coupled to the steering axle 410 in order to drive the latter in rotation, and to turn the steering wheel 400. The steering axle 410 is in fact in a straight linear connection with the handlebar 420, ensuring by pivot connection, inside the upper part of the fixed frame, the steering of the vehicle by blocking the rotation of the steering axle 410 and the handlebar 420 relative to each other, along the vertical axis.

[0099] According to the present embodiments, the steering axis 410 is mounted sliding in the first steering bearing 221 and in the second steering bearing 222.

[0100] According to one conceivable embodiment, the steering axis 410 can advantageously be replaced by a rod extended by a cylinder, and at the top of which a stop would be positioned (in the middle of the handlebar).

[0101] According to other conceivable embodiments, the longitudinal members 223 could also incorporate rods extended by jacks contained by stops, in order to confine their movements within a given volume, and reinforce the safety of the tricycle.

[0102] Thanks to the previously described design of the chassis 200, the latter has a deformation capacity in the plane of the frame in order to adapt the chassis geometry 200 on a downward or upward slope. In the example illustrated by [Fig.3], the tricycle is on a downward slope while in [Fig.2] the tricycle is moving along a horizontal line of the terrain which has an inclined profile.

[0103] With reference to figures 1, 2 and 5, the integration of the gardening tool(s) is now described.

[0104] Figures 1 and 5 illustrate an embodiment in which the gardening tool 900 includes cutting elements 910 for aerial plants and forms a hedge trimmer intended to extend transversely to a horizontal plane.

[0105] Fig. 2 illustrates an embodiment in which the gardening tool 900 includes grass cutting elements 910 located between the two wheels 320 of the running gear 300.

[0106] It is conceivable that the tricycle includes both cutting elements 910 for aerial plants, as well as cutting elements 910 for grasses located between the two wheels 320 of the sliding train 300.

[0107] Other gardening tools may be considered.

[0108] As mentioned previously, the cutting elements 910 are operated by the pedal 510.

[0109] As illustrated by Figures 1, 2, and 5, the gardening tool is mounted on the rear pendular 300 running gear.

[0110] In addition, the gardening tool has, with respect to the chassis 200, a mobility dependent on a degree of rotation of the running gear 300 around the axis of rotation R with respect to the chassis 200.

[0111] As can be seen in [Fig.2] in which the tricycle moves on sloping ground with a slope going from the right side of the figure to the left side of the figure, the running gear 300, thanks to its design, tilts according to the slope while the chassis remains straight due to the presence and action of the tricycle user.

[0112] In this embodiment, the cutting elements 910 are rotating elements carrying blades or wires. These cutting elements 910 are carried by the running gear 300, being distributed along the main axis A, between the two wheels 320, and thus follow the degree of rotation of the axle 310 relative to the chassis 200.

[0113] The running gear 300 is of course equipped, among other things, with transmission shafts and gear sub-assemblies enabling the rotational movement of the axle around the main axis A to be transmitted to the cutting elements 910.

[0114] In the embodiment of figures 1 and 5, the cutting elements 910 of aerial plants correspond to blades designed to perform a shearing action.

[0115] In order to carry these blades, the gardening tool 900 includes an auxiliary support 920 mounted pivoting about an axis parallel to the axis of rotation R, on one end of the running gear 300, in the immediate vicinity of a wheel 320.

[0116] This auxiliary support 920 is composed of a plurality of hollow tubes, joined together, housing auxiliary transmission means 930.

[0117] The auxiliary support 920 also includes a support rod 940 extending parallel to the blades, supporting these blades.

[0118] The gardening tool also includes a system for maintaining the orientation of the support rod 940, and thus of the cutting elements 910.

[0119] This retaining system takes the form of a spacer rod 950 coupled to one end of a sleeve 960 mounted movably in rotation on a longitudinal member 223 extending towards the rear of the tricycle 100, through the joint 230 underlying the saddle 110.

[0120] The sheath 960 is more precisely mounted non-sliding relative to this joint, and mobile in rotation of course.

[0121] In this way, the distance separating the fixing point of the spacer rod 950 from the joint 230 always remains the same.

[0122] The spacer rod thus extends from the sleeve 960 to the support rod 940 where it is coupled by means of a coupling 970 allowing a pivoting of the support rod 940 relative to the spacer rod 950, around an axis parallel to the axis of rotation R. A rotation of the running gear 300 relative to the chassis 200, leading to the lifting of the left rear wheel 320, thus causes the lifting relative to the chassis 200 of the gardening tool 900, whose angle relative to the chassis 200 is maintained thanks to the support of the movement made by the spacer rod 950.

[0123] According to a preferred embodiment, the pedal assembly assumes a barycentric position, with respect to the triangle formed by the three points of contact of the three wheels with the ground, according to a vertical projection of the pedal assembly in the plane defined by these three points of contact, whether this plane is horizontal or inclined with respect to a horizontal plane.

[0124] The tricycle described above provides an easier and safer gardening solution than gardening tricycles according to the prior art.

[0125] Indeed, the tricycle allows adaptation to the slopes encountered, offering considerable comfort for the user, while adapting the orientation of the mounted gardening tool.

[0126] The gardening tools mentioned above can of course be improved so that, for example, the hedge trimmer can also perform additional cutting at the same time, for example, on the top of a hedge. Other gardening tools are possible, for example, for weeding, hoeing, collecting, spreading, moss removal, or even burning weeds by spraying with boiling water...

[0127] For gardening tools which have an operating axis that must be perpendicular to the slope on which the tricycle moves, the orientation perpendicular to the slope of the support 620 which it naturally presents is used, thanks to connecting means (for example formed by simple rods) allowing the operating axes of the gardening tools to be paralleled to the orientation of the support 620.

Claims

Demands

1. Gardening tricycle (100) comprising: - means for generating a motor torque (500) comprising a crankset (510); - a frame (200) on which the crankset (510) and a saddle (110) are mounted; - a rear running gear (300), the running gear (300) comprising: - an axle (310) extending along a main axis (A);- two wheels (320) each mounted at one end of the axle (310), in which the tricycle (100) also includes a gardening tool (900) designed for cutting plants, characterized in that the rear running gear (300) is pendular, the axle (310) being rotationally mounted on the chassis (200) about an axis of rotation (R) extending transversely to the main axis (A) and in a general forward direction of the tricycle (100), and in that the gardening tool (900) is mounted on the running gear (300) and has, relative to the chassis (200), a mobility dependent on a degree of rotation of the running gear (300) around the axis of rotation (R) relative to the chassis (200).

2. Tricycle (100) according to the preceding claim, characterized in that the gardening tool (900) is operated by the pedal (510).

3. Tricycle (100) according to the preceding claim, characterized in that the gardening tool (900) comprises grass cutting elements (910) located between the two wheels (320) of the running gear (300).

4. Tricycle (100) according to any one of the preceding claims, characterized in that the gardening tool (900) comprises aerial plant cutting elements (910) and forms a hedge trimmer intended to extend transversely to a horizontal plane.

5. Tricycle (100) according to any one of claims 3 and 4, characterized in that the cutting elements (910) and the wheels (320) of the running gear (300) are coupled to the crankset (510) by means of transmission means (700), the means of transmission (700) incorporating a set of gears (710) configured to increase the actuation frequency of the cutting elements (910) relative to a rotation speed of the pedal assembly (510), and decrease the rotation frequency of the wheels (320) of the running gear (300).

6. Tricycle (100) according to any one of the preceding claims, characterized in that the running gear (300) comprises a wheel verticalization mechanism (320) formed by: - ​​a main ring (610) for each wheel (320), the wheel (320) being mounted freely for rotation on its main ring (610); - a support (620) forming a connecting rod mounted movably for rotation at a first end on the chassis (200), around the axis of rotation (R); - a crankshaft (630) mounted movably for rotation on a second end of the support (620); - a set of bars, for each wheel (320), the set of bars comprising at least one group of at least three parallel bars (600) not in a single common plane, the set of bars being mounted pivotally on the main ring (610) of said wheel (320) about axes parallel to the axis of rotation (R), and pivoting on the crankshaft (630) about axes parallel to the axis of rotation (R).

7. Tricycle (100) according to the preceding claim, characterized in that the wheel verticalization mechanism (320) comprises an intermediate ring (640) located between each wheel (320) and the crankshaft (630), and centered on the main axis (A), and in that the bar assembly comprises for each wheel: - a proximal group (650) of the crankshaft of at least three parallel bars (600) extending between the crankshaft and the intermediate ring; - a distant group (660) of the crankshaft (630) of at least three parallel bars (600) extending between the main ring (610) and the intermediate ring (640).

8. Tricycle (100) according to any one of the preceding claims, characterized in that the frame (200) comprises: - a fixed frame (210) extending in a single plane, called the frame plane, in which the axis of rotation (R) is inscribed, the saddle and the crankset (510) being mounted on the fixed frame; - a secondary frame (220) extending in the plane of the frame, the secondary frame (220) being deformable in the plane of the frame, in which the secondary frame (220) comprises: - a first steering bearing (221) mounted pivotally on the fixed frame (210), in the plane of the frame; - two longitudinal members (223) mounted to slide on pivot points carried by the fixed frame (210); - a second steering bearing (222) coupled movable to rotation on the two longitudinal members (223); the first steering bearing (221) and the second steering bearing (223) receiving a steering shaft (410) associated with a steering wheel (400).

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