Wheeled devices designed to climb stairs

Abstract

A rolling vehicle (701) comprises a chassis (710) having a pair of first wheels (702) and a wheel support (720) having a pair of second wheels (703), one of the first pair (702) and the second pair (703) being a pair of drive wheels rotated by at least one electric motor (722), and the other of the first pair (702) and the second pair (703) being a pair of non-drive wheels. The wheel support (720) is pivotally mounted on the chassis (710) so as to be movable between at least one extended position in which the chassis (710) can roll on the ground via the first wheels (702) and the second wheels (703), and a folded position in which the chassis (710) can roll on the ground only via the second wheels (703). (See Figure 14B for abbreviations.)

Description

Title of the invention: Rolling devices designed for climbing stairs. Technical field

[0001] The present invention relates to a rolling machine, a rolling machine for transporting persons, and a rolling machine for transporting goods.

[0002] The term "wheeled vehicle for transporting persons" means a vehicle comprising a seat for a person and wheels that allow the vehicle to move. This may be a stroller for a child, with one or more seats, or a wheelchair, for a child or an adult. Technological background

[0003] Such rolling machines are generally only suitable for rolling on flat or nearly flat surfaces with little or no incline. Some places are equipped with specific facilities such as access ramps to provide such surfaces, but many other places are not, which forces the rolling machine to climb a staircase.

[0004] However, a staircase, even one with only a few steps, can represent a difficult obstacle for the device to climb. In particular, for a person pushing a stroller, a staircase (in a subway station or stairwell, for example) can be difficult to climb without the help of another person.

[0005] To attempt to solve this problem, CN 211918803 U describes a child's stroller in which each of the two rear wheels is equipped with an electric disc motor, and each of the two front wheels consists of five casters mounted on a common rotating frame. However, in practice, such a stroller can only climb stairs if the person pushing the stroller exerts pressure by pushing down on the rear of the stroller to increase the traction of the rear wheels. Without action from the person pushing the stroller, the stroller is unable to climb stairs, unless the electric disc motor is very powerful and the rear wheels are similar to quad or motocross wheels, which would make the stroller excessively heavy.

[0006] Another solution is proposed in document CN 207631319 U, which describes a child's stroller in which each of the two front wheels consists of three casters mounted on a common rotating frame, and in which the two rotating frames are mounted on a common shaft driven by a single electric motor. However, in practice, the front wheels cross the first step of the staircase quite easily, but without any action from the person pushing the The stroller struggles to climb the next few steps. Furthermore, the stroller has the drawback that, when the electric motor is powered, the front wheels, consisting of three casters mounted on a common rotating frame, generate a jolt each time one of the casters makes contact with the ground or a step, which is uncomfortable for the child. Summary of the invention

[0007] The invention aims to provide a rolling vehicle for transporting people which is capable of safely climbing a staircase while minimizing jolts that cause discomfort for the person sitting in the vehicle.

[0008] For this purpose, the invention proposes a rolling device for transporting persons, the rolling device being a stroller for a child or a wheelchair and the rolling device comprising a chassis which supports a seat for a person and a propulsion system to propel the chassis, the propulsion system comprising: - wheels enabling the chassis to roll on the ground, the wheels comprising two front wheels and two rear wheels; - at least one electric motor; and - an on-board power source to supply electricity to at least one electric motor, in which each of the two front wheels comprises a rigid front rim and a deformable front rolling element arranged around the front rim, in which each of the two rear wheels comprises a rigid rear rim and a deformable rear rolling element arranged around the rear rim, in which said at least one electric motor is configured to effect a rotational drive of one of the front rims and the rear rims, and the propulsion system further comprises a transmission assembly configured so that said rotational drive drives the other of the front rims and the rear rims.

[0009] Such a wheeled device is capable of climbing a staircase safely and without any action from the person pushing the device or the person sitting in it (except to activate the propulsion system), thanks to the combination of two factors: the deformability of the front and rear rolling elements on the one hand, and the presence of the transmission assembly on the other. It is only necessary that at least one electric motor deliver sufficient torque. Indeed, when the front wheels are about to cross a step, the deformability of the front rolling elements ensures that the front wheels can cross the step, thanks to the torque supplied by at least one electric motor and through a local deformation of the front rolling elements; and On the other hand, torque is also supplied to the rear wheels, which further helps the rolling vehicle to climb the stair steps, and the deformable nature of the rear rolling elements prevents the rear wheels from slipping and allows the rear wheels to climb a stair step in turn.

[0010] In fact, due to the presence of the transmission assembly, both front wheels and both rear wheels are driven; in other words, all four wheels are driven. The vehicle according to the invention is, however, different from a vehicle where each wheel is driven by a separate electric motor: either said at least one electric motor drives the rear rims in rotation, and this rotation drives the front rims, or said at least one electric motor drives the front rims in rotation, and this rotation drives the rear rims.

[0011] Finally, since the front and rear wheels are not made up of casters mounted on a common rotating frame, there is no jolt each time one of the casters makes contact with the ground or a stair step. On the contrary, the deformable nature of the front and rear rolling elements tends to absorb any shock due to an irregularity in the vehicle's path, such as a stair step. The vehicle therefore minimizes jolts that cause discomfort for the person seated in it.

[0012] The principles described above are also applicable to other rolling stock besides a passenger transport vehicle. The invention therefore also relates to a rolling stock, in particular a transport vehicle, the rolling stock comprising a chassis and a propulsion system for propelling the chassis, the propulsion system comprising: - wheels allowing the chassis to roll on the ground, the wheels comprising two front wheels and two rear wheels; - at least one electric motor; and - an on-board power source to supply electricity to at least one electric motor, in which each of the two front wheels comprises a rigid front rim and a deformable front rolling element arranged around the front rim, in which each of the two rear wheels comprises a rigid rear rim and a deformable rear rolling element arranged around the rear rim, in which said at least one electric motor is configured to effect a rotational drive of one of the front rims and the rear rims, and the propulsion system further comprises a transmission assembly configured so that said rotational drive drives the other of the front rims and the rear rims.

[0013] The rolling stock may, in particular, be a goods transport vehicle. In this case, the chassis supports a structure for transporting goods. This structure may be configured to support goods, such as a platform, or configured to contain goods, such as a container. The container may be a rigid container or a flexible container such as a shopping bag. The term "goods" refers to any item or object capable of being transported, including parcels, boxes, crates, or bottles.

[0014] In certain embodiments, said at least one electric motor is configured to perform a rotational drive of the front rims and the transmission assembly is configured so that said rotational drive drives the rear rims.

[0015] This possibility is considered preferred within the scope of the invention, because the torque delivered by at least one electric motor is then supplied first to the front wheels, which helps the front wheels to climb a step. When an electric motor is provided for each front wheel, it may be sufficient for these electric motors to have a power output of 1.0 kW each. Of course, the power of the electric motor(s) can be different (and in particular higher), especially depending on the expected total weight of the vehicle. For example, if an electric motor is provided for each front wheel, these electric motors could each be 1.5 kW, 2 kW, or 3 kW.

[0016] In some embodiments, the on-board power source includes a battery, preferably a lithium-ion battery.

[0017] In some embodiments, the propulsion system comprises a single electric motor configured to drive the front rims of the two front wheels. In some embodiments, the transmission assembly includes a front differential and a rear differential, the front differential being driven by the single electric motor and driving the front rims of the two front wheels, and the rear differential being driven by the front differential and driving the rear rims of the two rear wheels.

[0018] In some embodiments, the propulsion system comprises two electric motors, each of the two electric motors being configured to achieve a rotational drive of the front rim of one of the front wheels, and the transmission assembly being configured so that the rotational drive of the front rim of one of the front wheels drives the rear rim of one of the rear wheels.

[0019] In some embodiments, the transmission assembly does not include a clutch between the electric motors and the front wheels. This considerably simplifies and lightens the transmission assembly. Such clutches are not necessary anyway, as the deformable rolling elements tend to dampen any shock due to an asperity on the path of the rolling vehicle, whether the electric motors are powered or not.

[0020] In some embodiments, the transmission assembly comprises two front pulleys each coupled to (and in particular coaxial with) the front rim of one of the front wheels, two rear pulleys each coupled to (and in particular coaxial with) the rear rim of one of the rear wheels, and two continuous drive elements each wound around a front pulley and a rear pulley, the two continuous drive elements each comprising a chain, a toothed belt or a smooth belt, and each of the two electric motors being arranged to drive one of the front pulleys.

[0021] In some embodiments, the chassis comprises two housing elements, each of the housing elements surrounding at least partially one of the two continuous drive elements.

[0022] In certain embodiments, each of the two electric motors drives one of the front pulleys via an auxiliary continuous drive element, the auxiliary continuous drive element preferably comprising a belt, more preferably a toothed belt.

[0023] In some embodiments, the front wheels are of a larger diameter than the rear wheels.

[0024] In certain embodiments, an outside diameter DF of the front deformable rolling elements is such that DF > 2H, preferably 3H > DF > 2.05H, where H is the height of the stair steps that the rolling equipment must traverse. In one example embodiment, DF > 34 cm, preferably 51 cm > DF > 35 cm. These values ​​of DF are suitable for the case where H = 17 cm. This value of H is a value usually imposed by construction standards. In certain embodiments, an outside diameter DR of the rear deformable rolling elements is such that DR > 2H, preferably 3H > DR > 2.05H.

[0025] In certain embodiments, each of the deformable front rolling elements and / or each of the deformable rear rolling elements includes a pneumatic tire.

[0026] In certain embodiments, the deformable front rolling elements and / or the deformable rear rolling elements are made of a material having a Shore A hardness between 50 inclusive and 70 inclusive.

[0027] In certain embodiments, a wheelbase E between the front and rear rims is such that 3.02 H < E < 3.71 H and / or 1.56 P < E < 1.91 P, where P is the depth of the stair treads that the rolling vehicle must traverse. In one example embodiment, 51.5 cm < E < 63.0 cm. These values ​​of E are suitable for the case where H = 17 cm and P = 33 cm. These values ​​of H and P are values typically imposed by building standards. In other embodiments, the wheelbase E is such that 2.32 H < E < 2.38 H and / or 1.20 P < E < 1.23 P. In one example, 39.4 cm < E < 40.5 cm. These values ​​of E are suitable for the case where H = 17 cm and P = 33 cm.

[0028] The invention further proposes a method for enabling a person to ascend a staircase using a rolling device according to any one of the embodiments described above, the staircase comprising a plurality of steps, each having a height H, and an outside diameter DF of the deformable front rolling elements of the rolling device being such that DF > 2H, preferably 3H > DF > 2.05H, the method comprising the following steps: - have the person sit down in the seat; and - supply at least one electric motor with electricity from the on-board power source, so that the front rims of the front wheels and the rear rims of the rear wheels are driven in rotation and the rolling machine goes up the stairs.

[0029] The invention further proposes a method for transporting goods up a staircase using a rolling device according to any one of the embodiments described above, the staircase comprising a plurality of steps, each having a height H, and an outside diameter DF of the deformable front rolling elements of the rolling device being such that DF > 2H, preferably 3H > DF > 2.05H, the method comprising the following steps: - to have the goods in and / or on the structure for the transport of goods; and - supply at least one electric motor with electricity from the on-board power source, so that the front rims of the front wheels and the rear rims of the rear wheels are driven in rotation and the rolling machine goes up the stairs.

[0030] In certain embodiments where the plurality of steps each has a depth P, a wheelbase E between the front rims and the rear rims is such that 3.02 H < E < 3.71 H and / or 1.56 P < E < 1.91 P. In other embodiments, the wheelbase E is such that 2.32 H < E < 2.38 H and / or 1.20 P < E < 1.23 P.

[0031] The invention also relates to a rolling machine comprising: - a chassis having a pair of spaced uprights; - a pair of first wheels fixed relative to the chassis, each of the first wheels being fixed to a lower end of said upright; - a wheel support comprising a pair of second wheels, one of which is a pair of drive wheels rotated by at least one electric motor, and the other of which is a pair of non-drive wheels; and - a transmission assembly configured to drive the non-driving wheels in rotation by the driving wheels, in which the wheel support is pivotally mounted on the chassis so as to be movable between at least one deployed position in which the chassis can roll on the ground via the first and second wheels, and a folded position in which the chassis can roll on the ground only via the first wheels, and in which said rotational driving of the non-driving wheels by the driving wheels is carried out in the deployed position and in the folded position.

[0032] Such a rolling device is capable of climbing stairs, in the same way as the rolling devices described above. Furthermore, because the rotational drive is present in both the deployed and folded positions, the rolling device can climb stairs using its electric motor(s) even when folded. Moreover, the pivoting of the wheel support relative to the chassis allows the rolling device to be adapted to the steepness of the stairs to be climbed.

[0033] In certain embodiments, the wheel support is mobile between a plurality of said deployed positions.

[0034] In some embodiments, the wheel support is mobile between a first deployed position and a second deployed position by pivoting at least 110 degrees relative to the chassis.

[0035] In some embodiments, each of the first two wheels comprises a first rigid rim and a first deformable rolling element arranged around the first rigid rim. In some embodiments, each of the second two wheels comprises a second rigid rim and a second deformable rolling element arranged around the second rigid rim.

[0036] In some embodiments, the first pair of wheels is the non-driving pair and the second pair of wheels is the driving pair. Tests carried out by the inventor have revealed that by designating the second wheels as driving wheels, the vehicle can more easily climb stairs. Furthermore, thanks to the fact that the wheel support is pivotally mounted, the second driving wheels can be positioned forward in the direction of travel of the vehicle, both for ascending and descending stairs.

[0037] In some embodiments, the rolling machine comprises two electric motors, each of the two electric motors driving one of the second wheels in rotation, the transmission assembly being configured to achieve a rotational drive of one of the first wheels by said second wheel.

[0038] In certain embodiments, the transmission assembly comprises two first pulleys, each coupled to one of the first wheels, two second pulleys, each coupled to one of the second wheels, and two drive elements Each continuous drive element is wound around a first pulley and a second pulley. The two continuous drive elements each comprise a chain, a toothed belt, or a smooth belt, and each of the two electric motors is arranged to drive one of the second pulleys. The first pulleys are preferably coaxial with the first wheels. The second pulleys are preferably coaxial with the second wheels.

[0039] Preferably, each of the two electric motors drives one of the second pulleys via an auxiliary continuous drive element, the auxiliary continuous drive element preferably comprising a belt, preferably a toothed belt.

[0040] In some embodiments, the first pair of wheels and the second pair of wheels are spaced along the longitudinal direction of the rolling vehicle. In some embodiments, in a deployed position of the wheel support, the first wheels partially overlap the second wheels along the longitudinal direction.

[0041] In certain embodiments, the rolling machine further comprises at least one handle fixed to an upper end of said uprights.

[0042] In certain embodiments, the chassis includes a crossbar fixed between the uprights, the crossbar being configured to allow at least one container, in particular a flexible container, to be attached to the chassis. Thus, the rolling stock can be used as a rolling stock for transporting goods.

[0043] In certain embodiments, each of the uprights includes a support element, the support elements being configured to allow at least one seat to be attached to the chassis. Thus, the rolling vehicle can be used as a rolling vehicle for transporting people.

[0044] The invention further proposes a method for making a rolling device ascend a staircase according to any one of the embodiments described above, the staircase comprising a plurality of steps, each having a height H, and an outside diameter DF of the second wheels (703) being such that DF > 2H, preferably 3H > DF > 2.05H, the method comprising the following step: - supply at least one electric motor with electricity, so that the drive wheels and non-drive wheels are driven in rotation and the rolling device goes up the stairs.

[0045] In certain embodiments where the plurality of steps each has a depth P, a wheelbase E between the first wheels and the second wheels is such that 1.57 H < E < 1.79 H and / or 0.81 P < E < 0.92 P. Brief description of the figures

[0046] The following description, with reference to the accompanying drawings, given by way of non-limiting examples, will clearly explain what the invention consists of and how it can be implemented. In the accompanying figures:

[0047] [Fig-1] The [Fig. 1] is a perspective view of a rolling vehicle for transporting persons according to an embodiment of the invention;

[0048] [Fig.1A] The [Fig.1A] is a diagram showing an alternative embodiment of the chassis of the machine;

[0049] [Fig.2] The [Fig.2] is a top view of the chassis of the machine;

[0050] [Fig.3] The [Fig.3] is a partial perspective view of the front of the machine;

[0051] [Fig.4] The [Fig.4] is another partial perspective view of the front of the machine;

[0052] [Fig.4A] Fig.4A is a diagram showing a chassis housing element of the machine;

[0053] [Fig.5] The [Fig.5] is a partial perspective view of the rear of the machine;

[0054] [Fig.6A] The [Fig.6A] is a diagram intended to explain the dimensioning of the front wheels of the machine;

[0055] [Fig.6B] The [Fig.6B] is a diagram intended to explain the dimensioning of the wheelbase of the machine;

[0056] [Fig.7] The [Fig.7] is another partial perspective view of the machine, showing a control box for controlling a control unit and the electric motors of the machine;

[0057] [Fig.8] The [Fig.8] is a simplified representation of the propulsion system of a rolling vehicle for transporting persons according to another embodiment of the invention;

[0058] [Fig.9] The [Fig.9] is a simplified representation of a rolling vehicle for transporting persons according to yet another embodiment of the invention;

[0059] [Fig. 10] The [Fig. 10] is a simplified representation of a rolling stock for transporting goods according to yet another embodiment of the invention;

[0060] [Fig. 11] The [Fig. 11] is a simplified representation of a rolling stock for transporting goods according to yet another embodiment of the invention;

[0061] [Fig. 12] The [Fig. 12] is a front view of a rolling machine according to yet another embodiment of the invention;

[0062] [Fig. 13] The [Fig. 13] is an enlarged perspective view of part of the device of the [Fig.12];

[0063] [Fig.14A] The [Fig.14A] is a front view of the vehicle of the [Fig. 12], showing a wheel support of the vehicle in an intermediate position between a first deployed position and a second deployed position;

[0064] [Fig.14B] [Fig.14B] is a side view of the machine in [Fig.12], showing the machine equipped with containers for transporting goods;

[0065] [Fig.14C] The [Fig.14C] is a side view of the device of the [Fig.12], showing the device equipped with a container for transporting goods and a seat for transporting a person, and the wheel support of the device in a folded position;

[0066] [Fig.l4D] The [Fig.l4D] is a side view analogous to the [Fig.l4C], showing the wheel support of the machine in the first deployed position;

[0067] [Fig.l4E] The [Fig.l4E] is a side view analogous to the [Fig.l4C], showing the wheel support of the machine in the second deployed position;

[0068] [Fig. 15] The [Fig. 15] is a schematic side view of an alternative embodiment of the device of the [Fig.12], in which the device comprises a seat housed in a rigid shell;

[0069] [Fig. 16] The [Fig. 16] is a schematic side view of another variant embodiment of the device of the [Fig. 12];

[0070] [Fig. 17] The [Fig. 17] is a schematic front view of the device of the [Fig. 16], from the right on the [Fig. 16];

[0071] [Fig. 18] The [Fig. 18] is a diagram intended to explain the dimensioning of the second wheels and the wheelbase of the machine in figures 12 to 17. Description of method(s) of implementation

[0072] In the figures, and unless otherwise specified, identical elements shall bear the same reference symbols.

[0073] Figure 1 shows in perspective a wheeled vehicle for transporting persons according to a first embodiment of the invention, in the form of a child's stroller 1 (hereinafter "the stroller 1"). The stroller 1 comprises a chassis 10 which supports a seat 90 for a child.

[0074] With reference to figures 1 to 3, the chassis 10 has two front uprights 18 and two rear uprights 14. The front uprights 18 are parallel and each carries a front wheel 2 at their lower end. Similarly, the rear uprights 14 are parallel and each carries a rear wheel 3 at their lower end. The front wheels 2 and the rear wheels 3 allow the chassis 10 to roll on the ground.

[0075] The upper ends of the rear uprights 14 are connected by a handle 15. The handle 15 allows a person to guide and push the stroller 1, and to hold the stroller 1 when it is going up or down stairs. Optionally, a crossbar 14A extends between the rear uprights 14 to allow for the attachment of luggage or a container such as a shopping bag 95. It should be noted that the shopping bag 95 has been omitted from the drawing in [Fig. 2] and [Fig. 7] in order to better visualize other elements of the stroller 1.

[0076] The seat 90 is fixed to the front uprights 18. In the example shown, the seat 90 is fixed to the front uprights 18, and includes a backrest 91 which extends between the front uprights 18 and a leg rest 92 inclined relative to the backrest 91. Alternatively, the 90 seat can be made in many other ways as long as it is attached to the front uprights 18 and allows a child to be seated in the stroller 1. It should be noted that the 90 seat has been omitted from the drawing in [Fig.2] and [Fig.3] in order to better visualize other elements of the stroller 1. It should also be noted that the stroller 1 can have several separate 90 seats, each allowing a child to be seated in the stroller 1, or even a single 90 seat that allows several children to be seated in the stroller 1.

[0077] The chassis 10 further comprises two lower elements 11. The lower elements 11 are parallel and arranged between the lower ends of the front uprights 18 and the lower ends of the rear uprights 14. With reference to Figures 2, 3 and 4, the front ends of the lower elements 11 are fixed to the lower ends of the front uprights 18, here by means of nuts screwed onto a threaded rod 12 which has a central portion 12A extending between the lower elements 11 and two lateral portions 12B each extending between a lower element 11 and a front upright 18.With reference to Figures 2 and 5, the rear ends of the lower elements 11 are fixed to the lower ends of the rear uprights 14, here by means of nuts screwed onto a threaded rod 13 which has a central portion 13A extending between the lower elements 11 and two lateral portions 13B each extending between a lower element 11 and a rear upright 14. A reinforcement 14R (see [Fig. 5]) can be fixed to a rear upright 14 and an adjacent lateral portion 13B.

[0078] The stroller 1 includes a propulsion system for propelling the chassis 10. This propulsion system includes the front wheels 2 and the rear wheels 3, electric motors 22 and an on-board power source.

[0079] In the example shown, the onboard power source comprises or consists of a battery 88, advantageously a lithium-ion battery. The battery 88 is preferably attached to and below the lower elements 11, as shown in Figures 1 to 3. This lowers the center of gravity of the stroller 1, preventing it from tipping over when going down stairs or an incline. Alternatively, the onboard power source can be implemented in other ways, for example, as a capacitor bank. In this case as well, it is preferable for the onboard power source to be attached to and below the lower elements 11.

[0080] The battery 88 is connected to the electric motors 22 via a control unit 89. This control unit 89 supplies the electrical power delivered by the battery 88 to the electric motors 22, according to a user command. The control unit 89 is preferably attached to and below the lower elements 11, as shown in Figures 1 to 3. Preferably, the control unit 89 is attached to the battery 88.

[0081] In the example shown in Figures 2, 3, and 4, the two lower elements 11 each consist of a rigid element such as a bar or a rod. Alternatively, as schematically shown in [Fig. 1A], each of the two lower elements 11 comprises two rigid elements 11-1, 11-2 such as a bar or a rod. The battery 88 and the control unit 89 are preferably attached to and below one of the rigid elements 11-1. The rigid elements 11-1, 11-2 are coupled to each other via a slidingly mounted rigid element 1IX and at least two elastic elements 11R such as springs. In this way, the rigid elements 11-1, 11-2 are likely to move relative to each other within a range of movement permitted by the rigid element 1IX, the elastic elements 1 IR tending to return the rigid elements 11-1, 11-2 to a position in which they are aligned.This allows the stroller 1 to comfortably overcome small bumps without requiring a suspension spring on the front wheels 2 and / or the rear wheels 3.

[0082] With reference to [Fig. 3] and [Fig. 4], an electric motor 22 is associated with each front wheel 2. For this purpose, the electric motor 22 is fixed in the vicinity of the front wheel 2, here by being attached to a plate 42 which is fixed to the front upright 18. The electric motor 22 is arranged to drive a front pulley 52. ​​Advantageously, as can be more clearly seen in [Fig. 4], the electric motor 22 drives the front pulley 52 via an auxiliary belt 62. It will be understood by referring to [Fig. 3] and [Fig. 4] that in this way, the electric motor 22 is offset relative to the axis of rotation of the front pulley 52. ​​This greatly facilitates the positioning and fixing of the electric motor 22, and allows the front pulley 52 to be fixed to the threaded rod 12 or at least in line with the threaded rod 12.Preferably, the auxiliary belt 62 is a toothed belt, which ensures good transmission of the torque produced by the electric motor 22 to the front pulley 52. ​​For this purpose, the toothed auxiliary belt 62 can be replaced by a chain, for example, a bicycle or motorcycle chain. However, the auxiliary belt 62 can also be a smooth belt without departing from the scope of the invention.

[0083] With reference now to [Fig. 3], the front wheel 2 comprises a rim 2J and a tire 2P arranged around the rim 2J, and the front pulley 52 is coupled to the rim 2J. Advantageously, the rim 2J is a bicycle wheel rim type, that is to say, the rim 2J is annular and connected via spokes 2R to a hub 2M. In this case, the front pulley 52 is coupled to the rim 2J via the hub 2M. In this way, the rim 2J is lightened, which lightens the stroller 1 and thus facilitates its transport, especially when folded. However, the rim 2J can have other geometries, and can in particular be solid, without departing from the frame of the invention. The front pulley 52 is coaxial with the rim 2J as can be seen in figures 3 and 4.

[0084] When the electric motors 22 are operating, the front pulleys 52 are driven in rotation, which results in a rotational drive of the rims 2J and thus turns the front wheels 2. But in addition, the front pulleys 52 are part of a transmission assembly 21 which further includes two drive belts 23 and two rear pulleys 53. As can be seen in Figures 1 to 5, each of the drive belts 23 is wound around a front pulley 52 and a rear pulley 53.

[0085] In the example shown, the drive belts 23 are toothed belts. This ensures good transmission of the torque produced by the electric motors 22 to the rear pulleys 53. For this purpose, the toothed drive belts 23 can be replaced by chains, for example, bicycle or motorcycle chains. However, the drive belts 23 can also be smooth belts without departing from the scope of the invention.

[0086] The frame 10 preferably includes at least one guide 25 (see [Fig.1], [Fig.3] and [Fig.4]) per drive belt 23 to guide this drive belt 23. As can be seen more clearly in Figures 3 and 4, each guide 25 may include two guide rollers 25A on either side of the drive belt 23.

[0087] Figures 3, 4, and 5 further show that, advantageously, two guides 25, each associated with a drive belt 23, are carried by a single rod 19. The rod 19 is constantly subjected to bending, so that the guides 25 carried by the rod 19 keep the drive belts 23 taut. On the other hand, when the pusher 1 moves, the rod 19 is subjected to bending and / or torsion, which allows the drive belts 23 to remain taut. To hold the rod 19 in place, the frame 10 has two stiffeners 17 (see [Fig.3], [Fig.4] and [Fig.5]) connecting the rod 19 to the threaded rod 13. Advantageously, each stiffener 17 has two bends 17U (see [Fig.3]) and 17V (see [Fig.5]) in opposite directions, so that the stiffener 17 has an overall "S" shaped profile.

[0088] The chassis 10 preferably comprises two housing elements 80, one of which has been schematically represented in [Fig. 4A]. The housing element 80 surrounds at least partially one of the two drive belts 23. For this purpose, at least a portion of the housing element 80 has a width 80W greater than the width of the drive belt 23. This improves the safety of the stroller 1, because a child sitting in the stroller 1 or walking beside the stroller 1 cannot easily touch the drive belts 23. The reliability of the stroller 1 is also improved because the drive belts 23 are protected against soiling and against impacts with nearby objects.

[0089] With reference to [Fig. 5], the rear wheels 3 are constructed similarly to the front wheels 2, i.e., a rear wheel 3 comprises a rim 3J and a tire 3P mounted around the rim 3J. Also similarly to the front wheels 2, the rim 3J is a bicycle wheel rim, i.e., the rim 3J is annular and connected via spokes 3R to a hub 3M. In this case, the front pulley 53 is coupled to the rim 3J via the hub 3M. In this way, the rim 3J is lightened, which lightens the stroller 1 and thus facilitates its transport, particularly when folded. However, the rim 3J can have other geometries, and in particular be solid, without departing from the scope of the invention. The rear pulley 53 is coaxial with the rim 3J as can be seen in [Fig.5].

[0090] As can be seen in [Fig.5], and in a manner analogous to the front pulleys 52, the rear pulleys 53 can be fixed on the threaded rod 13 or at least in the extension of the threaded rod 13.

[0091] Thanks to the transmission assembly 21 just described, the rotational drive of the rims 2J of the front wheels 2 by the electric motors 22 drives the rims 3J of the rear wheels 3, via the drive belts 23 and the rear pulleys 53. Thus, and also thanks to the fact that the tires 2P and 3P are deformable, the stroller 1 can climb a staircase without any action from the person pushing the stroller 1, provided that the electric motors 22 supply sufficient torque to the front wheels 2. Tests carried out by the inventor revealed that if the outside diameter DF (see [Fig. 6A]) of the tires 2P is approximately 40 cm (i.e., approximately 16 inches, where 1 inch = 25.4 mm), two electric motors 22 of 1.0 kW each are sufficient for a stroller 1 with a total unladen weight of 5.5 kg to climb a staircase stairs.Of course, the power of the 22 electric motors can be different (and in particular higher), especially depending on the total weight expected when loaded with the stroller 1. For example, the 22 electric motors can each be 1.5 kW, 2 kW or 3 kW motors.

[0092] Preferably, the transmission assembly 21 does not include a clutch between the electric motors 22 and the rims 2J. This considerably simplifies and lightens the transmission assembly 21. Such clutches are not necessary in any case because the tires 2P and 3P tend to absorb any shock due to an irregularity in the path of the stroller 1, whether the electric motors 22 are powered or not.

[0093] It should be noted that the front pulleys 52 can be mounted so as to permanently oppose the rotation of the front wheels 2. For example, the front pulleys 52 can be fixed by nuts in such a way that the front wheels 2 rotate against the tightening force of these nuts. Thus, the front wheels 2 are permanently braked, which provides an additional degree of safety to the stroller 1. Similarly, the pulleys rear 53 can be mounted so as to permanently oppose the rotation of the rear wheels 3.

[0094] In [Fig. 6A], to illustrate the sizing of the front wheels 2, one of the front wheels 2 is schematically represented engaged in a staircase 2000. This staircase 2000 comprises steps 2002, 2012, ... each with a height H. Generally, the value of H is dictated by local building codes. Purely as an example, H = 17 cm is a value commonly imposed by building codes, particularly in France.

[0095] By observing [Fig. 6A], it will be understood that it is particularly preferable for the outside diameter DF of the tires 2P to be strictly greater than 2H, in other words, for DF > 2H. For example, DF > 2.05H. Indeed, in this case, the horizontal diameter of the front wheel 2 is greater than the step 2012 that the front wheel 2 is about to cross. Thus, the front wheel 2 can cross the step 2012 without significant difficulty, thanks to the torque supplied by the electric motor 22 and with a local deformation of the tire 2P in the region indicated by the marker Q on [Fig. 6A]. On the other hand, the drive of the rear wheels 3 by the transmission assembly 21 (not shown in [Fig.6A]) also provides torque to the rear wheels 3, which further helps the stroller 1 to climb the stair steps 2002, 2012, ....Thus, and as already mentioned above, once the electric motors 22 are powered, the stroller 1 can climb a staircase 2000, without any action from the person pushing the stroller 1 (except to activate the propulsion system).

[0096] In one embodiment, DF > 34 cm, for example DF > 35 cm. These values ​​of DF are suitable for the case where H = 17 cm.

[0097] However, it is preferable that the front wheels 2 not be of too large a diameter, both to facilitate the transport of the stroller 1 and to allow the stroller 1 to climb several steps 2002, 2012, ... without being blocked due to an excessive diameter of the front wheels 2. Thus, in a preferred example, 3H > DF > 2.05H. In the case where H = 17 cm, we have 51 cm > DF > 35 cm.

[0098] Of course, the outside diameter of the 3P tires also preferably satisfies the above inequalities.

[0099] In [Fig. 6B], to explain the choice of the wheelbase E between the front wheels 2 and the rear wheels 3, one of the front wheels 2 and one of the rear wheels 3 are schematically represented engaged in the steps 2000. The wheelbase E is defined as the shortest distance between the axis of rotation of the rims 2J and the axis of rotation of the rims 3J. This shortest distance is considered orthogonal to the axis of rotation of the rims 2J and the axis of rotation of the rims 3J, in other words, parallel to a front-to-rear axis of the stroller 1. In addition to the height H mentioned above, the steps The stairwells from 2002, 2012, 2022, 2032, 2042, 2052, ... each have a depth P. Generally, the value of P is dictated by local building codes. As a purely example, P = 33 cm is a value commonly required by building codes, particularly in France.

[0100] By observing [Fig. 6B], it will be understood that it is particularly preferable for the wheelbase E to be chosen such that when the rear wheel 3 (respectively the front wheel 2) is in contact with the step it is about to cross (here step 2012), the front wheel 2 (respectively the rear wheel 3) is not in contact with the step it is about to cross (here step 2032). Otherwise, the electric motors 22 would be forced to provide extremely high torque in order for the front wheels 2 and the rear wheels 3 to be able to cross a stair step simultaneously (here steps 2012 and 2032). For this, preferably, the serif E satisfies at least one of the inequalities 3.02 H < E < 3.71 H and 1.56 P < E < 1.91 P, and more preferably the serif E satisfies both of these inequalities simultaneously.

[0101] In an exemplary embodiment, 51.5 cm < E < 63.0 cm. These values ​​of E are suitable for the case where H = 17 cm and P = 33 cm. Indeed, we have: 3.02 H = 51.3 cm; 3.71 H = 63.1 cm; 1.56 P = 51.5 cm; and 1.91 P = 63.0 cm. These values ​​advantageously correspond to the usual lengths of drive belts 23.

[0102] In view of the foregoing, it will be understood that the invention relates not only to a person transport device (such as the stroller 1), but also to a method for transporting a person (such as a child) up a staircase 2000 using the person transport device, the staircase 2000 comprising a plurality of steps 2002, 2012, ... each having a height H, and the outside diameter DF of the tires 2P being such that DF > 2H, preferably 3H > DF > 2.05H, the method comprising the following steps: - have the person sit in seat 90; and - supply the electric motors 22 with electricity from the battery 88, so that the front wheels 2 and the rear wheels 3 are driven in rotation and the person transport vehicle climbs the stairs 2000. In such a process, the wheelbase E between rims 2J and rims 3J is such that 3.02 H < E < 3.71 H and / or 1.56 P < E < 1.91 P.

[0103] The 2P tires can be replaced without inconvenience by any other type of deformable rolling element, for example, a solid elastomer rolling element or a hollow elastomer rolling element filled with a liquid, balls, etc. However, it is important that the 2P tires or the rolling elements that replace them be deformable so that the front wheels 2 can cross a step 2012 under the effect of the torque supplied by the electric motors 22 without significant difficulty. For this purpose, it is preferable that the material 2P tires or rolling elements that replace them have a Shore A hardness between 50 inclusive and 70 inclusive.

[0104] As for the 3P tires, they can also be replaced without any problem by any other type of deformable rolling element, such as 2P tires. However, it is important that the 3P tires or the rolling elements that replace them be deformable so that, while the front wheels 2 have already crossed a step 2012, the rear wheels 3 can in turn cross a step 2002 without significant difficulty. Conversely, if the rear wheels 3 were non-deformable, they would slip and struggle to cross a step 2002. For this purpose, it is preferable that the material of the 3P tires or the rolling elements that replace them have a Shore A hardness between 50 and 70 inclusive.

[0105] The 2P and 3P tires, or the deformable rolling elements that replace them, are preferably made of the same material.

[0106] Returning to [Fig. 1], we see that the front wheels 2 are preferably of a larger diameter than the rear wheels 3. In this way, and since the torque delivered by the electric motors 22 is transmitted first to the front wheels 2, the front wheels 2 receive a significant torque which is sufficient to climb a step 2002, 2012, ... while the rear wheels 3 receive a lesser torque which still helps the stroller 1 to climb the staircase 2000. Nevertheless, the front wheels 2 and the rear wheels 3 can be of the same diameter without departing from the scope of the invention.

[0107] As already mentioned above, the control unit 89 can supply the electrical power delivered by the battery 88 to the electric motors 22 according to a user command. This user command can be given in various ways by the person pushing the stroller 1. For example, the person can simply press a button that controls the starting and stopping of the electric motors 22 on the control unit 89, this button being integrated into the chassis 10, for example on the handle 15. Alternatively, this user command can also be given by the person pushing the stroller 1 by means of a control box 96.

[0108] An example embodiment of the control box 96 is shown in [Fig. 7]. In this example embodiment, the control box 96 is separate from the chassis 10 and is wireless, i.e., the control box 96 is connected to the control unit 89 via a suitable wireless connection, for example, via a Bluetooth (trademark) connection. As shown, the control box 96 is preferably small enough to be held by the person pushing the stroller 1 in one hand MH. The control box 96 advantageously includes a wrist strap 98 to prevent losing or dropping the control box 96.

[0109] In the example shown, the control box 96 includes a button or selector 97. This button or selector 97 allows the person pushing the stroller 1 to control the start and stop of the electric motors 22. The control box 96 may also include an indicator 99, here in the form of a screen, to display to the person the charge level of the battery 88.

[0110] Alternatively, the control box 96 can be permanently fixed on the chassis 10 and / or be wired, without going out of the scope of the invention.

[0111] Figure 8 is a simplified representation of the propulsion system of a person transport vehicle 301 according to another embodiment of the invention. In this figure, elements similar or identical to those described with reference to Figures 1 to 7 bear the same reference numbers increased by 300 and are not described again except where necessary.

[0112] The person transport vehicle 301 differs from the person transport vehicle 1 in its propulsion system and more particularly in its transmission assembly 321.

[0113] As shown, instead of an electric motor for each of the front wheels 302, the drive system comprises a single electric motor 322 configured to provide a rotational drive for the rims 302J of the front wheels 302. In addition, the transmission assembly 321 includes a front differential 372 and a rear differential 373. The front differential 372 is driven by the electric motor 322 and rotates the rims 302J of the front wheels 302. The rear differential 373 is driven by the front differential 372 and rotates the rear wheels 303, in this case driving their rims 303J.

[0114] In the example shown, the rear differential 373 is driven by the front differential 372 via an intermediate differential 374. This intermediate differential 374 is connected to the front differential 372 by a first driveshaft 375 and to the rear differential 373 by a second driveshaft 376. The first driveshaft 375 and / or the second driveshaft 376 may be cardan shafts, for example. Alternatively, the intermediate differential 374 may be omitted, in which case the rear differential 373 is connected directly to the front differential 372 by one or more driveshafts, such as cardan shafts.

[0115] The person transport vehicle 301 is otherwise identical to the person transport vehicle 1 and is therefore not described in further detail for the sake of brevity.

[0116] It should be noted that the chassis 10 of the person transport vehicle 1, 301 can be constructed in various ways, as long as the chassis 10 supports a seat 90 and as long as the person transport vehicle 1, 301 includes the propulsion system described. The The specific construction of chassis 10 shown in figures 1 to 5 and 7 is therefore in no way limiting.

[0117] It should also be noted that even though the person transport device 1, 301 has been described as a child's stroller, it can also be a wheelchair, for a child or an adult. The construction of the chassis 10 and possibly the seat 90 is then adapted accordingly. The control box 96 can then be placed on the chassis 10 or on the seat 90 so that it can be operated by the child or adult seated in the seat 90.

[0118] Fig. 9 is a simplified representation of a person transport vehicle 401 according to another embodiment of the invention in the form of a wheelchair, for a child or for an adult. In this figure, elements similar or identical to those described with reference to Figures 1 to 7 bear the same reference numbers increased by 400 and are not described again except where necessary.

[0119] In the person transport vehicle 401, the rear wheels 403 are larger in diameter than the front wheels 402, as is common for wheelchairs. Furthermore, and unlike the person transport vehicle 1 or 301, an electric motor 422 drives the rim 403J of a rear wheel 403, and not the rim 402J of a front wheel 402. More precisely, an electric motor 422 drives a rear pulley 453. The rotation of the rims 403J of the rear wheels 403 by the electric motors 422 drives the rims 2J of the front wheels 402, via the drive belts 23 and the front pulleys 452.

[0120] Fig. 9 also shows that battery 488 can be placed behind the backrest 491 of the seat 490, rather than under the seat 490.

[0121] The principles below are also applicable to other rolling stock besides a rolling stock for the transport of persons, and in particular to rolling stock for transport, especially to rolling stock for the transport of goods.

[0122] A goods transport vehicle differs from the passenger transport vehicles 1, 301, 401 described above in that the chassis of the vehicle supports a structure for the transport of goods. This structure may be a structure configured to support goods or a structure configured to contain goods.

[0123] Fig. 10 is a simplified representation of a rolling vehicle for the transport of goods 501 according to another embodiment of the invention. In this figure, elements similar or identical to those described with reference to Figures 1 to 7 bear the same reference numbers increased by 500 and are not described again except where necessary.

[0124] The goods transport unit 501 allows the transport of goods 3000, such as boxes or parcels 3010. The goods 3000 are supported on a platform which itself is supported by the chassis 510, for example by being supported by the lower elements 511. The platform and / or the lower elements 511 and / or the rear uprights 514 may have attachment points which allow straps 4000 to be attached to hold the goods 3000 on the platform.

[0125] Optionally, reinforcements 51 IR connect the rear uprights 514 to the lower elements 511 to stiffen the chassis 510.

[0126] The dotted lines on [Fig. 10] show that, optionally, the rear uprights 514 are pivotally mounted about a pivot axis 51 IC carried by the lower elements 511, and / or the handle 515 is pivotally mounted on the rear uprights 514.

[0127] Arrow F in [Fig. 10] shows the forward direction of the goods transport vehicle 501 when both electric motors 522 (only one of which is shown in [Fig. 10]) are powered. Similar to the person transport vehicle 1, once both electric motors 522 are powered, the goods transport vehicle 501 can ascend a staircase without any action from the person pushing the goods transport vehicle 501 (except to activate the propulsion system).

[0128] As with the stroller 1, it is preferable that the wheelbase E of the goods transport vehicle 501 satisfies at least one of the inequalities 3.02 H < E < 3.71 H and 1.56 P < E < 1.91 P, and more preferably the wheelbase E satisfies both of these inequalities simultaneously.

[0129] Figure 11 is a simplified representation of a goods transport vehicle 601 according to yet another embodiment of the invention. In this figure, elements similar or identical to those described with reference to Figures 1 to 7 bear the same reference numbers increased by 600 and are not described again except where necessary.

[0130] The goods transport unit 601 allows for the transport of goods 3000. More specifically, the goods transport unit 601 allows for the transport of one or more objects 3020 in a flexible container 695 such as a shopping bag and / or for the transport of bottles or other heavy objects 3030 on a platform. The shopping bag 695 is, for example, hung from a crossbar 618A extending between the front uprights 618. The platform is supported by the chassis 610, for example by being supported by the lower elements 611.

[0131] The dotted lines on [Fig.1 1] show that, optionally, the handle 615 is pivotally mounted on the front uprights 618.

[0132] Arrow F in [Fig. 1 1] shows the direction of forward movement of the goods transport vehicle 601 when the two electric motors 622 (of which only one is shown on [Fig. 10]) are powered. In the same way as the person transport vehicle 401, as soon as the two electric motors 622 are powered, the goods transport vehicle 601 can go up a staircase, without action from the person pulling the goods transport vehicle 601 by the handle 615 (except to activate the propulsion system).

[0133] The goods transport unit 601 may have the same wheelbase E as the goods transport unit 501. However, it is preferable for the goods transport unit 601 to have a shorter wheelbase E, in order to have dimensions comparable to those of a known wheeled shopping trolley. But even in this case, it is particularly preferable for the wheelbase E to be chosen such that when the rear wheel 603 (respectively the front wheel 602) is bearing against the step it is about to cross, the front wheel 602 (respectively the rear wheel 603) is not bearing against the step it is about to cross. Otherwise, the electric motors 622 would be forced to provide extremely high torque in order for the front wheels 602 and the rear wheels 603 to cross a step simultaneously.For this reason, preferably, the serif E satisfies at least one of the inequalities 2.32 H < E < 2.38 H and / or 1.20 P < E < 1.23 P, and more preferably the serif E satisfies both of these inequalities simultaneously.

[0134] In an exemplary embodiment, 39.4 cm < E < 40.5 cm. These values ​​of E are suitable for the case where H = 17 cm and P = 33 cm. Indeed, we have: 2.32 H = 39.4 cm; 2.38 H = 40.5 cm; 1.20 P = 39.6 cm; and 1.23 P = 40.6 cm. These values ​​advantageously correspond to the usual lengths of drive belts 623.

[0135] Figures 12 to 18 depict a rolling stock 701 according to yet another embodiment of the invention. As will be detailed below, the rolling stock 701 can be used as a rolling stock for transporting persons and / or as a rolling stock for transporting goods.

[0136] With reference to [Fig. 12], the rolling machine 701 comprises a chassis 710 which has two vertical and spaced uprights 718. The uprights 718 are parallel and each carries at its lower end a first wheel 702. One upper end of an upright 718 is extended by a bar 714. The bars 714 are connected to each other by a crossbar 715A which can serve as a handle, and / or by a crossbar 715C extended by two handles 715B. The crossbar 715A and the handles 715B allow a person to guide, pull, or push the rolling machine 701, and to hold the rolling machine 701 when it is going up or down a staircase. Optionally, a crossbar 715D, which will be described below, extends between the uprights 718. The bars 714 can be telescopic or sliding relative to the uprights 718 to allow adjustment of the height of the cross bars 715A, 715D and the handles 715B.

[0137] The rolling stock 701 further comprises a wheel support 720. The wheel support 720 comprises two second wheels 703. The wheels 702 and the wheels 703 are spaced along a longitudinal direction of the rolling stock 701, this longitudinal direction being the left-right direction in Figures 14B, 14C and 14D. The wheel support 720 comprises two lower elements 711 parallel to the longitudinal direction of the rolling stock 701. With reference to [Fig. 12], the lower elements 711 are fixed to the lower ends of the uprights 718, here by means of nuts screwed onto a threaded rod 713.

[0138] The rolling machine 701 includes a propulsion system for propelling the chassis 710. This propulsion system includes the first wheels 702 and the second wheels 703, electric motors 722 and an on-board source of electricity.

[0139] In the example shown, the on-board power source comprises or consists of a battery 788, advantageously a lithium-ion battery. The battery 788 is here fixed between the uprights 718 by means of mounting uprights 716. Alternatively, the battery 788 is preferably fixed to and below the lower elements 711, as shown in Figures 16 and 17. This lowers the center of gravity of the rolling stock 701, preventing it from tipping over when descending stairs or a sloping surface. Alternatively, the on-board power source can be implemented in other ways, for example, as a capacitor bank. In this case as well, it is preferable for the on-board power source to be fixed to and below the lower elements 711.

[0140] The battery 788 is connected to the electric motors 722 via a control unit 789. This control unit 789 supplies the electrical power delivered by the battery 788 to the electric motors 722, according to a user command. Preferably, the control unit 789 is attached to the battery 788.

[0141] In the example shown, the two lower elements 711 each consist of a rigid element such as a bar or a rod. Alternatively, analogously to the lower elements 11 of [Fig. 1A], each of the two lower elements 711 could comprise two rigid elements, such as a bar or a rod, coupled to each other via a slidingly mounted rigid element and at least two elastic elements such as springs.

[0142] With reference to [Fig. 12] and [Fig. 13], an electric motor 722 is associated with each first wheel 702. For this purpose, the electric motor 722 is fixed in the vicinity of the first wheel 702, here by being fixed to a plate 742 which is fixed to the upright 718. The electric motor 722 is arranged to drive a first pulley 752 coupled to the first wheel 702. The first pulley 752 is, in particular, coaxial with the first wheel 702 as shown in [Fig. 12] and [Fig. 13]. Advantageously, as more clearly shown in [Fig. 13], the electric motor 722 drives the first pulley 752 via an auxiliary belt 762. It will be understood from [Fig. 13] that in this way, the electric motor 722 is offset from the axis of rotation of the first pulley 702. This greatly facilitates the positioning and mounting of the electric motor 722. Preferably, the auxiliary belt 762 is a toothed belt, which ensures good transmission of the torque produced by the electric motor 722 to the first pulley 752. For this purpose, the toothed auxiliary belt 762 can be replaced by a chain, for example, a bicycle or motorcycle chain. However, the auxiliary belt 762 can also be a smooth belt without departing from the scope of the invention.

[0143] As can be seen in particular in [Fig. 12] and [Fig. 13], the first wheel 702 is advantageously analogous to the front wheel 2, that is to say, the first wheel 702 comprises a rim 702J and a tire 702P arranged around the rim 702J, and the first pulley 752 is coupled to the rim 702J. Advantageously, the rim 702J is a rim of the bicycle wheel type, that is to say, the rim 702J is annular and connected via spokes 702R to a hub 702M. In this case, the first pulley 752 is coupled to the rim 702J via the hub 702M. In this way, the rim 702J is lightened, which in turn lightens the rolling stock 701 and thus facilitates its transport. However, the rim 702J can have other geometries, and can in particular be solid, without departing from the scope of the invention. The first pulley 752 is coaxial with the rim 702J, as can be seen in [Fig. 13].The first pulleys 752 are fixed on the threaded rod 713 or at least in line with the threaded rod 713.

[0144] When the electric motors 722 are operating, the first pulleys 752 are driven in rotation, which in turn drives the rims 702J and thus rotates the first wheels 702. The first wheels 702 therefore function as drive wheels of the rolling machine 701, while the second wheels 703 function as non-drive wheels of the rolling machine 701. Furthermore, the first pulleys 752 are part of a transmission assembly 721 which also includes two drive belts 723 and two second pulleys 753. As can be seen in particular in [Fig. 13], each of the drive belts 723 is wound around a first pulley 752 and a second pulley 753.

[0145] In the example shown, the drive belts 723 are toothed belts. This ensures good transmission of the torque produced by the electric motors 722 to the second pulleys 753. For this purpose, the toothed drive belts 723 can be replaced by chains, for example of the chain type bicycle or motorcycle chain. However, the 723 drive belts can also be smooth belts without departing from the scope of the invention.

[0146] The wheel support 720 preferably includes at least one guide 725 (see [Fig. 13]) per drive belt 723 to guide this drive belt 723. Similar to the guides 25, each guide 725 may include two guide rollers on either side of this drive belt 723.

[0147] Figures 12 and 13 further show that, advantageously, two guides 725, each associated with a drive belt 723, are carried by a single rod 19. The rod 719 is constantly subjected to bending stress, so that the guides 725 carried by the rod 719 keep the drive belts 723 taut. On the other hand, when the rolling machine 701 moves, the rod 719 is subjected to bending and / or torsional stress, which allows the drive belts 723 to remain taut.

[0148] Not shown, the drive belts 723 can be surrounded at least partially by a housing element similar to the housing elements 80 of [Fig.4A].

[0149] With reference to [Fig. 13], the second wheels 703 are constructed analogously to the first wheels 702, i.e., a second wheel 703 comprises a rim 703J and a tire 703P mounted around the rim 703J. Also analogous to the first wheels 702, the rim 703J is a bicycle wheel rim, i.e., the rim 703J is annular and connected via spokes 703R to a hub 703M. In this case, the second pulley 703 is coupled to the rim 703J via the hub 703M. In this way, the rim 703J is lightened, which in turn lightens the rolling stock 701 and thus facilitates its transport. However, the rim 703J can have other geometries, and in particular be solid, without departing from the scope of the invention. The second pulley 753 is coaxial with the rim 703J, as can be seen in [Fig. 13].

[0150] As can be seen in [Fig.12] and [Fig.13], and similarly to the first pulleys 752, the second pulleys 753 can be fixed on a rod 712 or at least in the extension of the rod 712, the rod 712 being a threaded rod fixed by means of nuts to the lower elements 711.

[0151] Thanks to the transmission assembly 721 just described, the rotational drive of the rims 702J of the first drive wheels 702 by the electric motors 722 drives the rims 703J of the second non-drive wheels 703, via the drive belts 723 and the second pulleys 753. Thus, and also thanks to the fact that the tires 702P and 703P are deformable, the rolling machine 701 can climb a staircase without any action from the person pushing or pulling the rolling machine 701, provided that the electric motors 722 supply sufficient torque to the first drive wheels 702. Tests carried out by the inventor revealed that if The outer diameter of the 702P tires is approximately 40 cm (about 16 inches, where 1 inch = 25.4 mm). Two 722 electric motors of 1.0 kW each are sufficient for a 701 rolling vehicle with a total unladen weight of 5.5 kg to climb a staircase. Of course, the power of the 722 electric motors can vary (and in particular be higher), depending on the intended total laden weight of the 701 rolling vehicle. For example, the 722 electric motors could each be 1.5 kW, 2 kW, or 3 kW.

[0152] Preferably, the transmission assembly 721 does not include a clutch between the electric motors 722 and the rims 702J. This considerably simplifies and lightens the transmission assembly 721. Such clutches are not necessary in any case because the tires 702P and 703P tend to absorb any shock due to an irregularity in the path of the rolling vehicle 701, whether the electric motors 722 are powered or not.

[0153] It should be noted that the first pulleys 752 can be mounted so as to permanently oppose the rotation of the first drive wheels 702. For example, the first pulleys 752 can be fixed by nuts such that the first wheels 702 rotate against the tightening force of these nuts. Thus, the first wheels 702 are permanently braked, which provides an additional degree of safety to the rolling stock 701. Similarly, the second pulleys 753 can be mounted so as to permanently oppose the rotation of the second wheels 703.

[0154] As mentioned above, the second wheels 703 are carried by the wheel support 720. In the embodiment shown, the wheel support 720 is pivotally mounted on the chassis 710. In the example shown, this is achieved by providing that the lower elements 711 are pivotally mounted on the threaded rod 713. Thus, the wheel support 720 is movable by pivoting between: - a deployed position in which the chassis 710 can roll on the ground via the first wheels 702 and the second wheels 703, this deployed position being visible in particular in Figures 12 and 13; and - a folded position in which the chassis 710 can roll on the ground only via the first wheels 702, this folded position being visible in [Fig. 14C].

[0155] Furthermore, the rotational drive of the second non-driven wheels 703 by the first driven wheels 702 is achieved in both the deployed and folded positions. In other words, in both the deployed and folded positions, the second non-driven wheels 703 are driven by the first driven wheels 702 via the drive belts 723. Thus, the rolling machine 701 can climb a staircase thanks to the electric motors 722 even in the folded position shown in [Fig. 14C]. In this folded position, the user of the rolling machine The 701 can be pulled with one hand by the crossbar 715A or a handle 715B, while holding onto the stair railing with the other hand, which is very convenient and safe for the user. Furthermore, in the folded position, only the first wheels 702 are in contact with the ground, which allows the 701 to be climbed even if it is heavily loaded.

[0156] The wheel support 720 advantageously has several deployed positions, depending on the pivoting of the wheel support 720 relative to the chassis 710. Two of these deployed positions are shown as examples in [Fig. 14D] and [Fig. 14E]. Thus, the rolling vehicle 701 can, in particular, climb stairs of varying steepness. In other words, the pivoting of the wheel support 720 relative to the chassis 710 allows the rolling vehicle 701 to be adapted to the steepness of the stairs to be climbed.

[0157] Some of the deployed positions may allow the rolling vehicle 701 to more easily ascend or descend a staircase. For example: - the deployed position of [Fig.14D], where the wheel support 720 makes an obtuse angle (i.e. greater than 90 degrees) with the uprights 718, can allow easy descent of a staircase with the second wheels 703 forward in the direction of travel of the rolling machine 701; the fact that the four wheels 702, 703 are in contact with the staircase tends to secure the descent of the staircase; - the deployed position of [Fig.l4E], where the wheel support 720 makes an acute angle (i.e. less than 90 degrees) with the uprights 718, can allow easy climbing of a staircase with the second wheels 703 forward in the direction of travel of the rolling machine 701.

[0158] Fig. 14D and Fig. 14E also show that the wheel support 720 is movable between a first deployed position and a second deployed position by pivoting at least 110 degrees relative to the chassis 710. During this pivot of at least 110 degrees, the wheel support 720 passes into the intermediate position shown in Fig. 14A. In other words, pivoting the wheel support 720 by at least 110 degrees first moves the second wheels 703 under the chassis 710 as in Fig. 14A, and then into the second deployed position (see Fig. 14E) where the second wheels 703 are on the opposite side of the chassis 710 from the first deployed position (see Fig. 14D).

[0159] It will be noted that in the example shown, the transition from the folded position to a deployed position, and the transition from the first deployed position to the second deployed position, do not affect the tension of the drive belts 723 since the guides 725 and the rod 719 are part of the wheel support 720 and pivot with it.

[0160] As mentioned above, a crossbar 715D can extend between the uprights 718. With reference to Figures 14C and 14D, the crossbar 715D can to allow at least one container, in particular a flexible container 795 such as a shopping bag, to be attached to the chassis 710. Referring to [Fig. 14B], several flexible containers 795 can be attached to the chassis 795 using the crossbar 715D. Thus, with the rolling unit 701, one or more objects (not shown) placed in the flexible container(s) 795 can be transported.

[0161] Fig. 14B further shows that a container, in particular a rigid container 783 such as a basket, can be fixed to the wheel support 720 to allow one or more objects 3040 to be transported in the container 783.

[0162] With further reference to [Fig. 12], each of the uprights 718 has a support element 780. With reference to Figures 14C and 14D, these support elements 780 can allow at least one seat 790 to be attached to the frame 710. Similar to the seat 90, the seat 790 can have a backrest 791 extending between the uprights 18 and a leg rest 792 inclined relative to the backrest 791. The leg rest 792 is preferably attached to two rods 785, each of the two rods 785 being inserted into a support element 780. For example, the leg rest 792 can be fitted onto the rods 785. The rods 785 can be telescopic and / or sliding within the support elements 780. The backrest 791 can be inclined by report to file 791, in particular so as to be able to pass between the amounts 718.

[0163] The seat 790 can allow one or more people, children or adults, to be seated in the rolling machine 701. It is therefore understood that the rolling machine 701 can not only go up or down a staircase, but also lends itself easily to a multiplicity of uses: transport of goods thanks to the containers 795 and / or 783, transport of people thanks to the seat 790, or both transport of goods and transport of people.

[0164] Alternatively, the seat 790 can be made in a number of other ways as long as it is attached to the uprights 718. Figure 15 schematically illustrates one embodiment in which the seat 790 (shown in dashed lines) is housed in a rigid shell 794 such as an infant carrier or a baby car seat (also known as a "shell seat"). The rigid shell 794 is attached to the rods 785, or at least rests on the rods 785, and / or the rigid shell 794 is attached to the uprights 718 via one or more attachment points 795 known as such. Advantageously, in at least one deployed position of the wheel support 720, a first end 796 of the rigid shell 794 is located directly above the first wheels 702 as indicated by the dashed line CA, and / or a second end 797 of the rigid shell 794 is located directly above the second wheels 703 as indicated by the dashed line CB.

[0165] Arrow Z in [Fig. 15] shows that the position of the support elements 780 on the uprights 718 is advantageously adjustable. This also applies to the support elements 780 visible in Figures 12, 14C, 14D and 14E.

[0166] As can be seen in particular in Figures 12, 14B, 14C and 14D, in at least one deployed position of the wheel support 720, the first drive wheels 702 partially overlap the second non-drive wheels 703 in the longitudinal direction of the rolling stock 701. This tends to reduce the wheelbase E described below of the rolling stock 701 and therefore the overall size of the rolling stock 701.

[0167] In the example shown in Figures 12 to 15, the first drive wheels 702 have a larger diameter than the second non-drive wheels 703. However, the invention is not limited to this case. The second wheels 703 may have a larger diameter than the first wheels 702, or the first wheels 702 and the second wheels 703 may have the same diameter.

[0168] So far, only configurations have been described where the first wheels 702 are driven and the second wheels 703 are non-driven. However, the invention is not limited to this scenario. Conversely, the second wheels 703 can be driven while the first wheels 702 are driven. Tests carried out by the inventor have revealed that by designating the second wheels 703 as driven, the rolling vehicle 701 can more easily climb stairs. Furthermore, thanks to the pivoting of the wheel support 720 described above, the second driven wheels 703 can be positioned forward in the direction of travel of the rolling vehicle 701, both when ascending and descending stairs.

[0169] Figures 16 and 17 schematically illustrate an alternative embodiment of the rolling unit 701 in which the second wheels 703 are driven. In these figures, elements identical or similar to those already described with reference to Figures 12 to 15 bear the same reference numbers and are not described again unless necessary.

[0170] In the side view of [Fig. 16], it can be seen that it is the second pulleys 753 that are driven by the motors 722 and not the first pulleys 752. The attachments of the motors 722 to the wheel support 720 have not been shown to avoid cluttering the drawing. The operation of the transmission assembly 721 is otherwise identical to that described previously.

[0171] Fig. 16 also shows that, advantageously, the battery 788 and the control unit 789 are fixed to the lower elements 711 and below the lower elements 711. A platform not shown can be fixed to the lower elements 711 to carry bottles or other heavy objects 3030 on the platform.

[0172] Fig. 16 shows, moreover, that the first non-driving wheels 702 and the second driving wheels 703 are of equal diameter. In a particular example In production, the outside diameter of the 702P, 703P tires is approximately 40 cm (or approximately 16 inches, where 1 inch = 25.4 mm).

[0173] Fig. 16 further shows that in a deployed position of the wheel support 720, the first non-driving wheels 702 partially overlap the second driving wheels 703 along the longitudinal direction of the rolling machine 701.

[0174] Figure 17 is a schematic view of the wheel support 720, viewed from the right in Figure 16, according to one embodiment. In this embodiment, each of the second pulleys 753 has two winding surfaces 753A, 753B. The auxiliary belts 762 are wound around the winding surfaces 753A, while the drive belts 723 are wound around the winding surfaces 753B. The winding surfaces 753A and 753B are located on either side of a second wheel 703. More precisely, the winding surfaces 753A are situated on an inner side of the second wheels 703 (in the center in [Fig. 17]), while the winding surfaces 753B are situated on an outer side of the second wheels 703 (on the left and right sides in [Fig. 17]). This configuration allows the motors 722 to be easily positioned between the second wheels 703, which advantageously reduces the width of the rolling stock 701.Alternatively, if desired, the winding surfaces 753A, 753B could also be located on the same side of the second wheel 703.

[0175] Figure 18 is a schematic view of the rolling machine of Figures 16 and 17 ascending a staircase 2000. The height H and depth P of the stair treads 2002, 2012, 2022, 2032, 2042, 2052, ... have already been described above with reference to Figures 6A and 6B. For the reasons already stated above with reference to Figure 6A, the outside diameter DF of the second wheels 703 is preferably strictly greater than 2H, i.e., DF > 2H. For example, DF > 2.05H. Preferably, 3H > DF > 2.05H. The outside diameter of the first wheels 702 preferably satisfies the same inequalities.

[0176] The wheelbase E of the rolling stock 701 is defined as the shortest distance between the axis of rotation of the first wheels 702 and the axis of rotation of the second wheels 703. This shortest distance is considered orthogonal to the axis of rotation of the first wheels 702 and the axis of rotation of the second wheels 703, in other words parallel to the longitudinal direction of the rolling stock 701. Preferably, the wheelbase E satisfies at least one of the inequalities 1.57 H < E < 1.79 H and 0.81 P < E < 0.92 P, and more preferably the wheelbase E satisfies both of these inequalities simultaneously. With these wheelbase values ​​E, we can ensure that the first wheels 702 and the second wheels 703 rest either on the same step or on two consecutive steps, depending on the pivoting of the wheel support 720 relative to the chassis 710.

[0177] In an exemplary embodiment, 26.7 cm < E < 30.3 cm. These values ​​of E are suitable for the case where H = 17 cm and P = 33 cm. Indeed, we have: 1.57 H = 26.7 cm; 1.79 H = 30.4 cm; 0.81 P = 26.7 cm; and 1.91 P = 30.3 cm. These values ​​correspond advantageously to the usual lengths of drive belts 723.

[0178] In view of the foregoing, it will be understood that the invention relates not only to the rolling machine 701, but also to a method for making the rolling machine 701 ascend a staircase 2000, the staircase 2000 comprising a plurality of steps 2002, 2012, ... each having a height H, and an outside diameter DF of the second wheels 703 being such that DF > 2H, preferably 3H > DF > 2.05H, the method comprising the following step: - supply at least one electric motor 722 with electricity, so that the drive wheels and non-drive wheels are driven in rotation and the rolling machine climbs the staircase 2000.

[0179] The 702P, 703P tires of the rolling stock 701 can be made like the 2P, 3P tires. Like the 2P, 3P tires, the 702P, 703P tires can be replaced by any other type of deformable element.

[0180] The control unit 789 of the rolling stock 701 can be controlled by a control box identical or similar to the control box 96.

Claims

Demands

1. Rolling machine (701) comprising: - a chassis (710) having a pair of spaced uprights (718); - a pair of first wheels (702) fixed relative to the chassis (710), each of the first wheels (702) being fixed to a lower end of said upright (718); - a wheel support (720) having a pair of second wheels (703), one of the pair of first wheels (702) and the pair of second wheels (703) being a pair of drive wheels rotated by at least one electric motor (722), and the other of the pair of first wheels (702) and the pair of second wheels (703) being a pair of non-drive wheels;and - a transmission assembly (721) configured to achieve rotational drive of the non-drive wheels by the drive wheels, in which the wheel support (720) is pivotally mounted on the chassis (710) so as to be movable between at least one deployed position in which the chassis (710) can roll on the ground via the first wheels (702) and the second wheels (703), and a folded position in which the chassis (710) can roll on the ground only via the first wheels (702), and in which said rotational drive of the non-drive wheels by the drive wheels is achieved in the deployed position and in the folded position.;

2. Rolling machine (701) according to claim 1, wherein the first pair of wheels (702) is the non-driving wheel pair and the second pair of wheels (703) is the driving wheel pair.

3. Rolling machine (701) according to claim 2, wherein the rolling machine (701) comprises two electric motors (722), each of the two electric motors (722) driving in rotation one of the second wheels (702), the transmission assembly (721) being configured to achieve a rotational drive of one of the first wheels (703) by said second wheel (703).

4. Rolling machine (701) according to claim 3, wherein the transmission assembly (721) comprises two first pulleys (752) each coupled to one of the first wheels (702), two second pulleys (753) each coupled to one of the second wheels (703), and two continuous drive elements (723) each wound around a first pulley (752) and a second pulley (753), the two continuous drive elements (723) each comprising a chain, a toothed belt or a smooth belt, and each of the two electric motors (722) being arranged to drive one of the second pulleys (753), the first pulleys (752) preferably being coaxial with the first wheels (702), and the second pulleys (753) preferably being coaxial with the second wheels (703).

5. Rolling machine (701) according to claim 4, in which each of the two electric motors (722) drives one of the second pulleys (722) via an auxiliary continuous drive element (762), the auxiliary continuous drive element (762) preferably comprising a belt, preferably a toothed belt.

6. Rolling machine (701) according to any one of claims 1 to 5, wherein the pair of first wheels (702) and the pair of second wheels (703) are spaced along a longitudinal direction of the rolling machine (701), and wherein in a deployed position of the wheel support (720), the first wheels (702) partially overlap the second wheels (703) along the longitudinal direction.

7. Rolling machine (701) according to any one of claims 1 to 6, wherein the rolling machine (701) further comprises at least one handle (715A, 715B) fixed to an upper end of said uprights (718).

8. Rolling machine (701) according to claim 7, wherein the chassis (710) has a crossbar (715D) fixed between the uprights (718), the crossbar (715D) being configured to allow at least one container, in particular a flexible container (795), to be attached to the chassis (710).

9. Rolling machine (701) according to any one of claims 7 to 8, wherein each of the uprights (718) has a support element (780), the support elements (780) being configured to allow at least one seat (790) to be attached to the chassis (710).

10. A method for raising a staircase (2000) to a rolling device (701) according to any one of claims 1 to 9, the staircase comprising a plurality of steps (2002, 2012) each having a height H, and an outside diameter DF of the second wheels (703) being such that DF > 2H, preferably 3H > DF > 2.05H, the process comprising the following step: - supply at least one electric motor (722) with electricity, so that the drive wheels and non-drive wheels are driven in rotation and the rolling machine (701) goes up the stairs.

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