Bicycle vehicle, especially freight vehicle

Description

[0001] The present invention relates to a rolling machine, such as a load handling machine.

[0002] It relates more particularly to a rolling machine comprising a stabilization device including at least one leg and at least one actuating cylinder for said leg for moving said leg between an active stabilization position in which the leg is in contact with the ground and an inactive position in which the leg is away from the ground, the cylinder or at least one of the cylinders connectable to a fluid source comprising a first chamber connected to the fluid source by a first connection circuit and a second chamber connected to the fluid source by a second connection circuit to allow, in the fluid-supplied state of the first chamber, an actuating of the cylinder in the direction of a passage of the leg from the inactive position to the active stabilization position of the leg and in the fluid-supplied state of the second chamber,an actuation of the cylinder in the direction of a passage of the leg from the active stabilization position to the inactive position of the leg, said leg being configured to allow, under the effect of its own weight, an actuation of the cylinder in the direction of a passage of the leg from the inactive position to the active stabilization position and said first and second circuits each being equipped with a device for at least partial closure of the associated circuit, the at least partial closure device of the second circuit being a pressure-sensitive closure device comprising at least one sealing member configured to move, depending on the fluid pressure prevailing on the first circuit, between an open position of the second circuit and a closed position of the second circuit in which fluid circulation in the second circuit, from the second chamber of the cylinder to the fluid source, is prevented.

[0003] Machinery requiring stabilization when stationary, particularly in working configuration, using a stabilization device to prevent overturning is well known to those skilled in this field. For safety reasons, the operator is informed of the active or inactive state of the stabilization device to prevent them from operating the machine while it is active. Numerous solutions exist for providing this information. However, existing solutions are generally expensive or unreliable. WO 2012 / 059872 A1 discloses a rolling machine according to the preamble of claim 1.

[0004] One aim of the invention is to provide a machine equipped with a stabilization device whose design allows, if necessary, reliable and inexpensive information relating to the active state of the stabilization device to be obtained.

[0005] To this end, the invention relates to a rolling vehicle comprising a stabilization device including at least one leg and at least one actuating cylinder for said leg, enabling movement of said leg between an active stabilization position in which the leg is in contact with the ground and an inactive position in which the leg is raised away from the ground. The cylinder, or at least one of the cylinders, is connectable to a fluid source comprising a first chamber connected to the fluid source by a first connection circuit and a second chamber connected to the fluid source by a second connection circuit. When the first chamber is supplied with fluid, the cylinder is actuation in the direction of moving the leg from the inactive position to the active stabilization position, and when the second chamber is supplied with fluid, the cylinder is actuation in the direction of moving the leg from the active stabilization position to the...inactive position of the leg, said leg being configured to allow, under the effect of its own weight, actuation of the cylinder in the direction of a transition of the leg from the inactive position to the active stabilization position, and said first and second circuits each being equipped with a device for at least partially closing the associated circuit, the at least partially closing device of the second circuit being a pressure-sensitive closing device comprising at least one shut-off member configured to move, depending on the fluid pressure prevailing on the first circuit, between an open position of the second circuit and a closed position of the second circuit in which fluid circulation in the second circuit from the second chamber of the cylinder to the fluid source is prevented, characterized in that at least one shut-off member of the device for at least partially closing the second circuit is configured toThe second circuit switches from open to closed position depending on the pressure in the first circuit between the at least partial closing device of the first circuit and the first chamber of the cylinder. This design allows the weight of the leg to be used to prevent residual pressure in the first chamber and ensures that the at least partial closing device of the second circuit is only activated once this residual pressure has been released. This portion of the first circuit between the at least partial closing device of the first circuit and the first chamber of the cylinder, to the pressure at which at least one shut-off element of the at least partial closing device of the second circuit is sensitive to switch from open to closed position, is preferably free of a shut-off element in said circuit. In other words, this portion of the first circuit between the at least partial closing device of the second circuit and the first chamber of the cylinder is not closed.partial of the first circuit and the first chamber of the cylinder to the pressure of which at least one sealing member of the closing device at least partial of the second circuit is sensitive to move from the open position to the closed position corresponds to the portion of the first circuit extending between the first chamber of the cylinder and the part of the closing device of the first circuit closest to the first chamber of the cylinder.

[0006] According to one embodiment of the invention, at least one shut-off member of the device for at least partially closing the second circuit is configured to move from the open position to the closed position of the second circuit when the pressure in the first circuit between the device for at least partially closing the first circuit and the first chamber of the cylinder is below a predetermined threshold value. This design prevents the presence of residual pressure in the first chamber. It is thus possible to reliably measure, via a pressure-determining device such as a pressure sensor or a pressure switch, the pressure in the first chamber of the leg actuation cylinder and to conclude that the leg is in the inactive position when the measured pressure is below a predetermined value, without risk of error.

[0007] According to one embodiment of the invention, the machine comprises a warning signal emitting device, a control unit, and a pressure-determining device for the pressure in the first circuit between the at least partial closure device of the first circuit and the first chamber of the cylinder. The control unit, in communication with the pressure-determining device, is configured to control the warning signal emitting device based on the pressure determined by the pressure-determining device. The warning signal emitting device may be a simple indicator light which, depending on whether it is illuminated or off, allows the machine operator to know the active or inactive position of the stabilizing leg(s) of the stabilizing device.

[0008] According to one embodiment of the invention, the device for at least partially closing the first circuit is a pressure-sensitive closing device comprising at least one sealing member configured to, depending on the fluid pressure prevailing on the second circuit, move between an open position of the first circuit and a closed position of the first circuit in which fluid circulation in the first circuit from the first chamber of the cylinder to the fluid source is prevented.

[0009] According to one embodiment of the invention, at least one shut-off element of the device for at least partially closing the first circuit is configured to move between the open and closed positions of the first circuit depending on the pressure in the second circuit between the device for at least partially closing the second circuit and the fluid source to which the second circuit is connected. In particular, at least one shut-off element of the device for at least partially closing the first circuit is configured to move from the open to the closed position of the first circuit when the pressure in the second circuit between the device for at least partially closing the second circuit and the fluid source to which the second circuit is connected is less than a predetermined threshold value.

[0010] According to the invention, the device for at least partially closing the first circuit comprises at least one balancing valve or a pilot-operated check valve, and at least one shut-off element of the device for at least partially closing the second circuit is configured to move from the open position to the closed position of the second circuit depending on the pressure prevailing in the first circuit between the balancing valve(s) or the pilot-operated check valve(s) of the closing device of said first circuit and the first chamber of the cylinder. This valve or check valve may be a standard commercial product.

[0011] According to one embodiment of the invention, the balancing valve or pilot-operated check valve and the shut-off member, configured to move between an open position of the first circuit and a closed position of the first circuit (in which fluid flow in the first circuit, from the first chamber of the cylinder to the fluid source, is prevented) depending on the fluid pressure in the second circuit, are common. The shut-off member and the balancing valve or pilot-operated check valve are thus formed by a single component.

[0012] According to one embodiment of the invention, at least one sealing element of the device for at least partially closing the second circuit, configured to move, depending on the fluid pressure prevailing on the first circuit, between an open position of the second circuit and a closed position of the second circuit in which fluid circulation in the second circuit from the second chamber of the cylinder to the fluid source is prevented, is a balancing valve or a piloted check valve.

[0013] According to one embodiment of the invention, the fluid source comprises at least one pump, at least one atmospheric pressure reservoir, and a distributor through which the first and second connection circuits can be connected to at least one reservoir and at least one pump. This fluid source design allows fluid to be supplied to either chamber.

[0014] According to one embodiment of the invention, the stabilizing leg, or at least one of them, is a leg pivoting about a horizontal axis for moving the leg between a lowered and a raised position, and the leg actuating cylinder, or at least one of them, is a drive cylinder for pivoting the leg. Alternatively, the leg may be a telescopic leg and the cylinder a leg length adjustment cylinder.

[0015] According to one embodiment of the invention, the stabilizer leg actuation cylinder, or at least one of them, comprises a body and a piston rod, and the second chamber is located on the rod side of the cylinder. Obviously, an embodiment in which the second chamber is located on the body side of the cylinder can be considered, although this solution is not preferred. Brève description des dessins

[0016] The invention will be better understood upon reading the following description of exemplary embodiments, with reference to the attached drawings in which: [ Fig. 1 ] represents a perspective view of a device according to the invention in the inactive position of the stabilizing legs, [ Fig. 2 ] represents a view of the vehicle taken from the front with both stabilizing legs in the active stabilization position, [ Fig. 3 ] represents a view of the craft taken from the front with one of the craft's stabilizing legs in the inactive position, [ Fig. 4 ] represents, in the form of a series of hydraulic diagrams, the movement of the actuation cylinder of a stabilizing leg from the retracted position to the extended position for the movement of the leg from an inactive position to an active stabilization position, [ Fig. 5 ] represents in the form of a series of hydraulic diagrams, the passage of the actuation cylinder of a stabilizing leg from the extended position to the retracted position for the passage of the leg from an active stabilizing position to an inactive position.

[0017] As mentioned above, the invention relates to a rolling device 1 comprising a stabilizing device 2. This rolling device 1 can take on a wide variety of forms. This device 1 is generally a load- or person-handling device 1.

[0018] The stabilization device 2 is generally intended to prevent the rolling machine 1 from tipping over or overturning, particularly when handling loads at high heights using a lifting arm as in the example shown.

[0019] This stabilizing device 2 generally comprises a plurality of stabilizing legs 3 as in the example shown in the figure 1 , where the device includes two 3 stabilizing legs at the front of the device.

[0020] This stabilization device 2 further includes, for each stabilizing leg 3, at least one actuator 4 for actuating said leg 3 to move said leg 3 between an active stabilization position in which the leg 3 is in contact with the ground, as in the example shown in the figure 2 , and an inactive position in which leg 3 is away from the ground as in the example shown in the figure 1 .

[0021] To enable such actuation of the cylinder 4, this cylinder 4 is connectable to a fluid source 5 and comprises a first chamber 6 connected to the fluid source 5 by a first connecting circuit 8 and a second chamber 7 connected to the fluid source 5 by a second connecting circuit 9. When the first chamber 6 is supplied with fluid, actuation of the cylinder 4 allows the stabilizing leg 3 to move from its inactive position to its active stabilizing position. When the second chamber 7 is supplied with fluid, actuation of the cylinder 4 allows the stabilizing leg 3 to move from its active stabilizing position to its inactive position.

[0022] In the examples shown, the actuator 4 of a stabilizing leg 3 comprises a piston body 41 and rod 42 and the second chamber 7 is arranged on the rod 42 side of the actuator 4. Thus, the supply of fluid to the first chamber 6 of the actuator causes the rod of the actuator to extend and, consequently, the stabilizing chamber 3 to move from an inactive position to an active position.

[0023] Obviously, a solution in which the second chamber 7 is positioned on the cylinder body side could also have been considered without going out of scope of the invention.

[0024] Similarly, it should be noted that the description uses a single actuator 4 for actuation of a stabilizing leg 3, but the device 1 can equivalently comprise a pair of identical actuators mounted in parallel on the fluid supply circuit, which will be described below, and working together in synchronicity, without departing from the scope of the invention. For this reason, the term "actuating actuator" will refer to both a single actuator and a pair of actuators.

[0025] The fluid source to which each cylinder chamber is connected can also take many forms. Generally, this fluid source 5 comprises, as in the examples shown, a distributor 53, an atmospheric pressure reservoir 51, and a pump 52.

[0026] This fluid source design (5) allows pressurized fluid to be supplied to either chamber of the cylinder (4) on each stabilizing leg (3). This cylinder is a hydraulic cylinder, and the fluid is oil.

[0027] Leg 3 can be designed as a pivoting leg around a horizontal pivot axis when the device 1 is positioned on a flat surface. This leg 3 can thus, by pivoting around its pivot axis under the action of cylinder 4, which is a drive cylinder for the pivoting movement of leg 3, move from a lowered position to a raised position and vice versa, the lowered position corresponding to the active stabilization position.

[0028] Alternatively, or in addition, the stabilizing leg can be made in the form of a telescopic leg, and the leg actuating cylinder for moving the leg from an active to an inactive position and vice versa can be a leg length adjustment cylinder that extends or retracts the telescopic section. Thus, the leg can be made as two slidingly mounted elements, with the cylinder body coupled to one element and the rod to the other, so that the extension or retraction of the cylinder rod simultaneously causes the sliding movement of the stabilizing leg elements.

[0029] Regardless of its embodiment, leg 3 is configured to allow, under the effect of its own weight, an actuation of the cylinder 4 in the direction of a passage of leg 3 from the inactive position to the active stabilization position.

[0030] This arrangement, combined with the design of the first and second connection circuits of the first and second chambers of the cylinder to the fluid source 5, makes it possible to control the value of the residual pressure in the first chamber 6.

[0031] In the examples shown, the first circuit 8 connecting the first chamber 6 to the fluid source 5 includes a device 10 for at least partial closure of the first circuit 8 and the second circuit 9 connecting the second chamber 7 to the fluid source 5 includes a device 11 for at least partial closure of the second circuit 9.

[0032] In the examples, the device 11 for at least partial closure of the second circuit 9 is a pressure-sensitive closure device 11 comprising a sealing member 110, configured to, depending on the fluid pressure prevailing on the first circuit 8, move between an open position of the second circuit 9 and a closed position of the second circuit 9 in which it prevents, in the second circuit 9, the circulation of fluid from the second chamber 7 of the cylinder 4 to the fluid source 5.

[0033] This closing element 110 of the device 11 for at least partial closure of the second circuit 9 is configured to move from the open position to the closed position of the second circuit 9 according to the pressure prevailing on the first circuit 8, between the device 10 for at least partial closure of the first circuit 8 and the first chamber 6 of the cylinder 4. In particular, the device 10 for at least partial closure of the first circuit 8 includes at least one balancing valve 100A or a piloted check valve and at least one closing element 110 of the device 11 for at least partial closure of the second circuit 9 is configured to move from the open position to the closed position of the second circuit 9 according to the pressure prevailing on the first circuit 8 between the balancing valve 100A or the piloted check valve of the closing device 10 of said first circuit 8 and the first chamber 6 of the cylinder 4.It should be noted that at least one shut-off element 110 of the device 11 for at least partially closing the second circuit 9, configured to move, depending on the fluid pressure in the first circuit 8, between an open position of the second circuit 9 and a closed position of the second circuit 9 in which fluid circulation in the second circuit 9 from the second chamber 7 of the cylinder 4 to the fluid source 5 is prevented, may be a balancing valve or a pilot-operated check valve. According to the invention, the shut-off element 110 of the device 11 for at least partially closing the second circuit 9 is a balancing valve.

[0034] Indeed, in the examples shown, the device 11 for closing the second circuit 9 includes a balancing valve in parallel with a check valve. The balancing valve, located on a so-called main branch of the second circuit, is a spring-loaded valve that is actuated according to the pressure in the first circuit 8 between the device 10 for at least partial closure of the first circuit 8 and the first chamber 6 of the cylinder 4. The balancing valve prevents hydraulic fluid from flowing from the cylinder 4 as long as the hydraulic fluid pressure is below a predetermined threshold value. Such a balancing valve allows hydraulic fluid to flow in only one direction. This is why it is mounted in parallel with a check valve, which allows pressurized hydraulic fluid to flow in the opposite direction to the flow permitted by the balancing valve.This balancing valve forms the shut-off element 110 of the closure device 11, configured to switch from the open to the closed position of the second circuit 9 according to the pressure prevailing in the first circuit 8, between the at least partial closure device 10 of the first circuit 8 and the first chamber 6 of the cylinder 4. This portion of the first circuit 8, extending between the at least partial closure device 10 of the first circuit 8 and the first chamber 6 of the cylinder 4, and to the pressure at which at least one shut-off element 110 of the at least partial closure device of the second circuit is sensitive to switch from the open to the closed position, is free of a shut-off element. This portion of the first circuit 8 extends downstream of the at least partial closure device 10 of the first circuit, considered in the direction of fluid flow from the fluid source 5 to the cylinder 4.In particular, this position of the first circuit 8 extends downstream of the balancing valve 100A or the pilot-operated check valve of said first circuit, measured with respect to the direction of fluid flow from the fluid source 5 to the cylinder 4, specifically the first chamber of the cylinder 4. The second circuit 9 includes, on a branch branch of the main branch allowing bypass of the shut-off device 110, a spring-loaded check valve. This check valve, in the closed position, prevents fluid flow from the second chamber 7 to the fluid source 5.

[0035] In such a closing device 11, the circulation of fluid from the fluid source 5 to the second chamber 7 of the cylinder 4 is always possible via this bypass branch, provided that the fluid pressure is greater than the spring setting pressure of the check valve.

[0036] Thus, the balancing valve forming part of the shut-off device 110 on the main line of the second circuit 9 can be in the closed position without impeding the possibility of supplying fluid to the second chamber 7 via the bypass branch equipped with the check valve. For this reason, the shut-off device 11 is called a partially shut-off device, because the flow of fluid from the fluid source 5 to the second chamber 7 cannot be prevented when the pressure of the fluid from the fluid source 5 exceeds a predetermined pressure value.

[0037] The closing element 110 of the closing device 11 formed by the balancing valve equipping the main branch of the second circuit 9, is configured to move from the open position of the second circuit to the closed position of the second circuit 9 in which a circulation of fluid from the second chamber 7 of the cylinder 4 to the source 5 of fluid is prevented when the pressure prevailing on the first circuit 8 between the closing device 10 at least partially of the first circuit 8, in particular between the or one of the balancing valves 100A or the or one of the check valves of the closing device 10 of the first circuit 8 and the first chamber 6 of the cylinder is less than a predetermined threshold value.The shut-off element 110 of the closure device 11, formed by the valve equipping the main branch of the second circuit 9, is configured to move from the closed position of the second circuit 9, in which fluid flow from the second chamber 7 of the cylinder 4 to the fluid source 5 is prevented, to the open position of the second circuit when the pressure prevailing on the first circuit 8 between the at least partial closure device 10 of the first circuit 8 and the first chamber 6 of the cylinder exceeds a predetermined threshold value. It should be noted that the balancing valve constituting the shut-off element 110 could have been replaced by a pilot-operated check valve without departing from the scope of the invention.

[0038] Similarly, the device 10 for at least partial closure of the first circuit 8 is a pressure-sensitive closure device 10, comprising a sealing member 100 configured to, depending on the fluid pressure prevailing on the second circuit 9, move between an open position of the first circuit 8 and a closed position of the first circuit 8 in which the circulation of fluid in the first circuit 8 from the first chamber 6 of the cylinder 4 to the fluid source 5 is prevented.

[0039] The sealing element 100 of the device 10 for at least partial closure of the first circuit 8 is configured to move from the open position to the closed position of the first circuit 8 according to the pressure prevailing on the second circuit 9 between the device 11 for at least partial closure of the second circuit 9 and the source 5 of fluid to which the second circuit 9 is connected.

[0040] This device 10, which at least partially closes the first circuit 8, includes, similarly to the device 11, which at least partially closes the second circuit 9, a balancing valve in parallel with a check valve. The balancing valve prevents hydraulic fluid from flowing from the cylinder 4 as long as the hydraulic fluid pressure is below a predetermined threshold value. Such a balancing valve allows hydraulic fluid to flow in only one direction. Therefore, it is mounted in parallel with a check valve, which allows pressurized hydraulic fluid to flow in the opposite direction to the flow permitted by the balancing valve.

[0041] Again, this balancing valve, located on a so-called main branch of the first circuit, is a spring-loaded and controllable valve, notably according to the pressure prevailing on the second circuit 9 between the device 11 for at least partial closure of the second circuit 9 and the fluid source 5. This balancing valve forms the closing element 100 of the closure device 10 configured to move from the open position to the closed position of the first circuit 8 according to the pressure prevailing on the second circuit 9 between the device 11 for at least partial closure of the second circuit 9 and the fluid source 5 to which the second circuit 9 is connected.It should be noted that the sealing element 100 of the device 10 for at least partial closure of the first circuit 8 configured to, depending on the fluid pressure prevailing on the second circuit 9, move between an open position of the first circuit 8 and a closed position of the first circuit 8 in which a circulation of fluid in the first circuit 8, from the first chamber 6 of the cylinder 4 to the source 5 of fluid is prevented, is common with the balancing valve 100A or the piloted check valve which serves to delimit the portion of the first circuit 8 extending between the device 10 for at least partial closure of the first circuit 8 and the first chamber 6 of the cylinder 4 and to the pressure of which at least one sealing element 110 of the device for at least partial closure of the second circuit is sensitive to move from the open position to the closed position.

[0042] The first circuit 8 includes, on a branch off the main branch allowing to bypass this balancing valve, a spring-loaded check valve, this check valve preventing, in closed position, the circulation of fluid from the first chamber 6 to the fluid source 5.

[0043] In such a closing device 10, the circulation of fluid from the fluid source 5 to the first chamber 6 of the cylinder is always possible, via this bypass branch, provided that the fluid pressure is greater than the spring setting pressure of the check valve.

[0044] Thus, the balancing valve constituting the sealing element 100 provided on the main line of the first circuit 8 can be in the closed position without affecting the possibility of supplying fluid to the first chamber 6 via the bypass branch equipped with the non-return valve.

[0045] This is why the closing device 10 is called a at least partial closing device, because the circulation of fluid from the fluid source 5 to the first chamber 6 cannot be prevented when the fluid pressure from the fluid source 5 is greater than a predetermined pressure value.

[0046] The closing device 10 and in particular the sealing member 100 equipping the main branch of the first circuit 8 is configured to move from the open position of the first circuit to the closed position of the first circuit 8 in which a circulation of fluid from the first chamber 6 of the cylinder 4 to the source 5 of fluid is prevented when the pressure prevailing on the second circuit 9 between the closing device 11 at least partially of the second circuit 9 and the source of fluid of the cylinder is less than a predetermined threshold value.

[0047] To complete the assembly, the machine 1 also includes a device 12 for emitting a light or sound warning signal, a control unit 13 and a device 14 for determining the pressure prevailing on the first circuit 8, between the device 10 for at least partial closure of the first circuit 8 and the first chamber 6 of the cylinder 4.

[0048] This pressure determination device 14 can be a pressure sensor or a pressure switch located in the first chamber 6 of the cylinder or on the portion of the first circuit connecting this first chamber 6 to the device 10 for at least partial closure of the first circuit 8.

[0049] The pressure value, or a signal that is a function of the pressure, is sent to the control unit 13. This control unit 13 includes electronic and / or computer-based data processing means, such as a microprocessor with associated working memory. When the expression "the control unit is configured to" is used, it means that the microprocessor includes instructions to perform the action.

[0050] The control unit 13 is therefore configured to control the emission of a signal, for example a light, at the level of the emission device 12 located in the cockpit, for example at the level of the instrument panel when the measured pressure is less than a predetermined value, which means that the stabilizing leg 3 is in an inactive position.

[0051] In practice, the control of cylinder 4 and the movement of the stabilizing leg 3 from an inactive to an active position are carried out as follows: it is assumed that the cylinder rod is retracted, as in the first diagram, to the top left of the figure 4 The stabilizing leg 3 is therefore in the inactive position. The machine operator, using a control device such as a lever, actuates the cylinder 4, extending the cylinder rod to move it from the inactive to the active position. This action by the operator causes the distributor 53 to move and the pump 52 to operate, supplying fluid, particularly oil, to the first chamber 6 of the cylinder and venting the second chamber 7 of the cylinder by opening the shut-off device 110 of the second circuit 9, which is fitted to the second circuit 9. Meanwhile, the first chamber 6 of the cylinder is supplied via the bypass branch of the first circuit 8, which is equipped with a check valve. The shut-off device 100 of the first shut-off device 10 therefore remains in the closed position.

[0052] When the machine operator ceases to act on the control member for actuation of the cylinder 4 in the direction of a movement of the cylinder, the distributor 53 returns to a position in which the first and second circuits are no longer connected to the reservoir 51 or to the pump 52.

[0053] In this configuration corresponding to the third diagram of the figure 4 If the stabilizing leg is not yet on the ground, i.e., is still in an inactive position, the cylinder rod can be moved in the direction of extension under the weight of the leg, as illustrated in the penultimate diagram of the figure 4 . This extension of the rod allows the pressure in the first chamber 6 of the cylinder 4 to drop below a predetermined threshold value, so that the sealing element 110 of the closing device 11 of the second circuit 9 passes into the closed position of said circuit and any circulation of fluid from the second chamber 7 to the fluid source 5 is prevented.

[0054] The possibility of lowering the pressure in the first chamber 6 and controlling the closure of the sealing organ 110 of the closing device 11 of the second circuit as a function of this pressure makes it possible to avoid the presence of a residual pressure in the first chamber 6, which would suggest that the stabilizing leg 3 is in place.

[0055] When the extension movement of the cylinder rod is continued until the leg is placed on the ground to occupy an active position as illustrated in the last diagram of the figure 4 , the rod of the cylinder can no longer come out and the sealing element 110 of the closing device 11 of the second circuit remains in the open position, which does not in itself constitute a problem.

[0056] The retraction of the cylinder rod to move the stabilizing leg 3 from its active position to an inactive position is achieved by supplying the second chamber 7 of the cylinder, as illustrated in the second diagram of the figure 5 , using the distributor 53 and the pump 52, while the sealing element 100 of the closing device 10 of the first circuit 8 is also brought to the open position under the effect of the pressure prevailing on the second circuit 9 between the at least partial closing device 11 of the second circuit 9 and the fluid source 5 to which the second fluid circuit is connected.

[0057] When the cylinder reaches its end-of-stroke position, corresponding to its retracted position, the closing devices of the first and second circuits are brought to the closed position. Stabilizing leg 3 is in the inactive position. The actuating cylinder 4 for stabilizing leg 3 can then be extended again as described above.

Claims

1. Wheeled vehicle (1) comprising a stabilization device (2) comprising at least one leg (3) and at least one actuator (4) for actuating said leg (3) for a movement of said leg (3) between an active stabilization position in which the leg (3) bears against the ground and an inactive position in which the leg (3) is spaced apart from the ground, the or at least one of the actuators (4) connectable to a fluid source (5) comprising a first chamber (6) connected to the fluid source (5) by a first connection circuit (8) and a second chamber (7) connected to the fluid source (5) by a second connection circuit (9) in order to enable, when the first chamber (6) is supplied with fluid, an actuation of the actuator in the direction for passing the leg (3) from the inactive position to the active stabilization position of the leg (3), and, when the second chamber (7) is supplied with fluid, an actuation of the actuator (4) in the direction for passing the leg (3) from the active stabilization position to the inactive position of the leg (3), said leg (3) being configured to enable, under the effect of its own weight, an actuation of the actuator (4) in the direction for passing the leg (3) from the inactive position to the active stabilization position and said first and second circuits (8; 9) each being equipped with a device (10; 11) for at least partially closing the associated circuit (8; 9), the device (11) for at least partially closing the second circuit (9) being a pressure-sensitive closure device (11) comprising at least one shut-off member (110) configured to, depending on the fluid pressure prevailing in the first circuit (8), move between an open position of the second circuit (9) and a closed position of the second circuit (9) in which fluid flow in the second circuit (9) from the second chamber (7) of the actuator (4) to the fluid source (5) is prevented, characterized in that the device (10) for at least partially closing the first circuit (8) comprises at least one balancing valve (100A) or one controlled non-return valve, in that the at least one shut-off member (110) of the device (11) for at least partially closing the second circuit (9) is configured to pass from the open position to the closed position of the second circuit (9) depending on the pressure prevailing in the first circuit (8) between the or one of the balancing valves or the or one of the controlled non-return valves of the device (10) for at least partially closing the first circuit (8) and the first chamber (6) of the actuator (4).

2. Wheeled vehicle (1) according to Claim 1, characterized in that the at least one shut-off member (110) of the device (11) for at least partially closing the second circuit is configured to pass from the open position to the closed position of the second circuit (9) when the pressure prevailing in the first circuit (8) between the device (10) for at least partially closing the first circuit (8) and the first chamber (6) of the actuator (4) is lower than a predetermined threshold value.

3. Wheeled vehicle (1) according to either of Claims 1 and 2, characterized in that it comprises a device (12) for emitting a warning signal, a control unit (13) and a device (14) for determining the pressure prevailing in the first circuit (8) between the device (10) for at least partially closing the first circuit (8) and the first chamber (6) of the actuator (4), said control unit (13) in communication with the device (14) for determining the pressure being configured to control the device (12) for emitting a warning signal depending on the pressure determined by the device (14) for determining the pressure.

4. Wheeled vehicle (1) according to one of Claims 1 to 3, characterized in that the device (10) for at least partially closing the first circuit (8) is a pressure-sensitive closure device (10) comprising at least one shut-off member (100) configured to, depending on the fluid pressure prevailing in the second circuit (9), move between an open position of the first circuit (8) and a closed position of the first circuit (8) in which fluid flow in the first circuit (8) from the first chamber (6) of the actuator (4) to the fluid source (5) is prevented.

5. Wheeled vehicle (1) according to Claim 4, characterized in that the at least one shut-off member (100) of the device (10) for at least partially closing the first circuit (8) is configured to move between the open position and the closed position of the first circuit (8) depending on the pressure prevailing in the second circuit (9) between the device (11) for at least partially closing the second circuit (9) and the fluid source (5) to which the second circuit (9) is connected.

6. Wheeled vehicle (1) according to either of Claims 4 and 5, characterized in that the balancing valve (100A) or the controlled non-return valve and the shut-off member (100) configured to, depending on the fluid pressure prevailing in the second circuit (9), move between an open position of the first circuit (8) and a closed position of the first circuit (8) in which fluid flow in the first circuit (8) from the first chamber (6) of the actuator (4) to the fluid source (5) is prevented are common.

7. Wheeled vehicle (1) according to one of Claims 1 to 6, characterized in that the at least one shut-off member (110) of the device (11) for at least partially closing the second circuit (9) configured to, depending on the fluid pressure prevailing in the first circuit (8), move between an open position of the second circuit (9) and a closed position of the second circuit (9) in which fluid flow in the second circuit (9) from the second chamber (7) of the actuator (4) to the fluid source (5) is prevented is a balancing valve or a controlled non-return valve.

8. Wheeled vehicle (1) according to one of Claims 1 to 7, characterized in that the fluid source (5) comprises at least one pump (52), at least one reservoir (51) at atmospheric pressure and a distributor (53) by way of which the first and second connection circuits (8, 9) are connectable at least to a reservoir (51) and to the at least one pump (52).

9. Wheeled vehicle (1) according to one of Claims 1 to 8, characterized in that the or at least one of the stabilization legs (3) is a leg that is pivotable about an axis, referred to as horizontal axis, for a movement of the leg (3) between a lowered position and a raised position and the or at least one of the actuators (4) for actuating the leg (3) is an actuator for driving the pivoting movement of the leg (3).

10. Wheeled vehicle (1) according to one of Claims 1 to 9, characterized in that the or at least one of the actuators (4) for actuating the stabilization leg (3) comprises a body (41) and a piston rod (42), and in that the second chamber (7) is disposed on the side of the rod (42) of the actuator (4).