Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
  • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
  • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
  • B66F9/065—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks non-masted
  • B66F9/0655—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks non-masted with a telescopic boom
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
  • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
  • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
  • B66F9/075—Constructional features or details
  • B66F9/07559—Stabilizing means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
  • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
  • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
  • B66F9/075—Constructional features or details
  • B66F9/20—Means for actuating or controlling masts, platforms, or forks
  • B66F9/22—Hydraulic devices or systems
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
  • F15B11/003—Systems with load-holding valves
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/30—Directional control
  • F15B2211/305—Directional control characterised by the type of valves
  • F15B2211/30505—Non-return valves, i.e. check valves
  • F15B2211/30515—Load holding valves
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/30—Directional control
  • F15B2211/32—Directional control characterised by the type of actuation
  • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure

Definitions

• Rolling machine such as a load handling machine
• the present invention relates to a rolling machine, such as a load handling machine.
• a rolling machine comprising a stabilization device comprising at least one leg and at least one actuator for actuating said leg for a displacement of said leg between an active stabilization position in which the leg is supported. on the ground and an inactive position in which the leg is spaced from the ground, the or at least one of the jacks connectable to a source of fluid comprising a first chamber connected to the source of fluid 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, actuation of the jack 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, actuation of the cylinder in the direction of a passage of the leg from the active stabilization position to the po inactive position of the leg, said leg being configured to allow, under the effect of its own weight, actuation of the jack in the direction of a passage of the leg from the
• An object of the invention is to provide a machine equipped with a stabilization device, the design of which makes it possible to obtain, if necessary, in a reliable and inexpensive manner, information relating to the active state of the stabilization device.
• the invention relates to a rolling machine comprising a stabilization device comprising at least one leg and at least one actuator for actuating said leg for a displacement of said leg between an active stabilization position in in which the leg is resting on the ground and an inactive position in which the leg is spaced from the ground, the or at least one of the jacks connectable to a source of fluid comprising a first chamber connected to the source of fluid by a first circuit connection 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, actuation of the jack in the direction of a passage of the leg from the position inactive in the active stabilization position of the leg and, in the fluid-supplied state of the second chamber, actuation of the jack 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, actuation of the jack in the direction of a passage of the leg
• This design makes it possible to use the weight of the leg to avoid the presence of residual pressure in the first chamber and to order the closing of the at least partial closure device of the second circuit only once this residual pressure has been released.
• of the first circuit between the at least partial closure device of the first circuit and the first chamber of the cylinder at the pressure of which the at least one closure member of the at least partial closure device of the second circuit is sensitive to pass from the position open to the closed position is preferably free of any closure member of said circuit.
• this portion of the first circuit between the at least partial closure device of the first circuit and the first chamber of the jack at the pressure of which the at least one closure member of the at least partial closure device of the second circuit is sensitive to go 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 closure device of the first circuit closest to the first chamber of the cylinder.
• the at least one closure member of the at least partial closure device of the second circuit is configured to pass from the open position to the closed position of the second circuit when the prevailing pressure on the first circuit between the device for at least partial closing of the first circuit and the first chamber of the jack is less than a predetermined threshold value.
• a pressure determining device such as a pressure sensor or a pressure switch, the pressure in the first chamber of the actuating cylinder of the leg and to conclude that the leg is in the inactive position when the measured pressure is lower than a predetermined value without risk of error.
• the machine comprises a device for transmitting an alert signal, a control unit and a control device. determination of the pressure prevailing on the first circuit between the device for at least partial closing of the first circuit and the first chamber of the jack, said control unit in communication with the device for determining the pressure being configured to control the emission device an alert signal as a function of the pressure determined by the pressure determination device.
• the device for emitting a warning signal can be formed by a simple indicator light which, depending on its lighted or extinguished state, allows the driver of the machine to know the active or inactive position of the stabilization leg (s). of the stabilization device.
• the at least partial closure device of the first circuit is a pressure-sensitive closure device comprising at least one closure member configured for, as a function of the fluid pressure reigning on the second circuit, moving between an open position of the first circuit and a closed position of the first circuit in which a flow of fluid in the first circuit from the first chamber of the cylinder to the source of fluid is prevented.
• the at least one closure member of the at least partial closure device of the first circuit is configured to move between the open position and the closed position of the first circuit as a function of the pressure prevailing on the second circuit between the device for at least partial closing of the second circuit and the source of fluid to which the second circuit is connected.
• the at least one closure member of the at least partial closure device of the first circuit is configured to switch from the open position to the closed position of the first circuit when the pressure prevailing on the second circuit between the closure device at the first circuit. less partial of the second circuit and the source of fluid to which the second circuit is connected is less than a predetermined threshold value.
• the at least partial closure device of the first circuit comprises at least one balancing valve or a controlled non-return valve and the at least one closure member of the control device.
• at least partial closure of the second circuit is configured to switch from the open position to the closed position of the second circuit depending on the pressure prevailing on the first circuit between the or one of the balancing valves or the or one of the controlled non-return valves of the closing device of said first circuit and the first chamber of the jack.
• This valve or this valve can be standard products on the market.
• the balancing valve or the controlled non-return valve and the closure 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 a circulation of fluid in the first circuit, from the first chamber of the cylinder to the source of fluid is prevented are common.
• the closure member and the balancing valve or the piloted non-return valve are thus formed by one and the same member.
• the at least one closure member of the at least partial closure device of the second circuit configured to, depending on the fluid pressure prevailing on the first circuit, move between an open position of the second circuit and a closed position of the second circuit in which a flow of fluid in the second circuit from the second chamber of the cylinder to the source of fluid is prevented, is a balancing valve or a controlled non-return valve .
• the fluid source comprises at least one pump, at least one atmospheric pressure tank and a distributor through which the first and second connection circuits are connectable at least to a reservoir and at least one pump.
• This design of the fluid source allows fluid to be supplied to either chamber.
• the or at least one of the stabilization legs is a pivoting leg about a so-called horizontal axis for a displacement of the leg between a lowered position and a raised position and the or at least one of the actuating jacks of the leg is a drive cylinder in pivoting movement of the leg.
• the leg may be a telescopic leg and the jack a jack for adjusting the length of the leg.
• the or at least one of the actuating cylinders of the stabilizing leg comprises a body and a piston rod and the second chamber is disposed on the rod side of the cylinder. Obviously, an embodiment in which the second chamber would be arranged on the body side of the jack can be envisaged even if this solution is not preferred.
• FIG. 1 is a perspective view of a machine according to the invention in the inactive position of the stabilizing legs
• FIG. 2 represents a view of the machine taken from the front with the two stabilization legs in the active stabilization position
• FIG. 3 represents a view of the machine taken from the front with one of the stabilizing legs of the machine in inactive position
• FIG. 4 shows in the form of a series of hydraulic diagrams, the passage of the actuating cylinder of a stabilization leg from the retracted position to the extended position for the passage of the leg from an inactive position to an active position of stabilization
• FIG. 5 shows in the form of a series of hydraulic diagrams, the passage of the actuator cylinder of a stabilization leg from the extended position to the retracted position for the passage of the leg from an active stabilization position to a position inactive.
• the invention relates to a rolling machine 1 comprising a stabilization device 2.
• This rolling machine 1 can affect a large number of forms.
• This device 1 is generally a device 1 for handling loads or people.
• the stabilization device 2 generally has the object of preventing an overturning or tilting of the rolling machine 1, in particular when it handles loads at high heights using a lifting arm such as in the example shown.
• This stabilization device 2 generally comprises a plurality of stabilizing legs 3 as in the example shown in Figure 1, where the machine comprises two stabilizing legs 3 at the front of the machine.
• This stabilization device 2 further comprises, for each stabilizing leg 3, at least one actuator 4 for actuating said leg 3 for a displacement of said leg 3 between an active stabilization position in which the leg 3 is in support on the ground, as in the example shown in Figure 2, and an inactive position in which the leg 3 is spaced from the ground as in the example shown in Figure 1.
• this cylinder 4 is connectable to a source 5 of fluid and comprises a first chamber 6 connected to the source 5 of fluid by a first connection circuit 8 and a second chamber 7 connected to the source 5 of fluid via a second connection circuit 9.
• actuation of the jack 4 allows movement of the stabilization leg 3 in the direction of passage of the leg 3 from the inactive position to the active stabilization position of the leg.
• actuation of the jack 4 allows a displacement of the stabilization leg 3 in the direction of a passage of the leg 3 from an active stabilization position to an active stabilization position. inactive leg position 3.
• the actuator 4 for actuating a stabilizing leg 3 comprises a body 41 and a piston rod 42 and the second chamber 7 is disposed on the rod side 42 of the cylinder 4.
• the power supply fluid from the first chamber 6 of the cylinder causes the output of the cylinder rod and, consequently, the passage of the stabilization chamber 3 from an inactive position to an active position.
• actuating cylinder will be understood to mean both a single cylinder and a pair of cylinders.
• this source 5 of fluid comprises, as in the examples shown, a distributor 53, a reservoir 51 at atmospheric pressure and a pump 52.
• This design of the fluid source 5 makes it possible to supply pressurized fluid to one or the other of the chambers of the cylinder 4 of each stabilizing leg 3.
• This cylinder is a hydraulic cylinder and the fluid of the oil.
• the leg 3 can be made in the form of a pivoting leg about a so-called horizontal pivot axis, in the position of the vehicle 1 on a flat surface. This leg 3 can thus, by pivoting around its pivot axis under the action of the cylinder 4 which is a drive cylinder in pivoting movement of the leg 3, pass from a lowered position to a raised position and vice versa, the lowered position corresponding to the active stabilization position.
• the stabilizing leg can be produced in the form of a telescopic leg, and the actuating cylinder of the leg for the passage of the leg from an active position to an inactive position and vice versa can be a cylinder for adjusting the length of the leg by extending or retracting the telescope.
• the leg can be made in the form of two elements mounted in sliding interlocking and the cylinder body is coupled to one of the elements and the rod to the other of the elements, so that the entry or exit of the rod of the cylinder causes the sliding interlocking movement of the elements of the stabilizing leg in parallel.
• the 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 the leg 3 from the inactive position to the position active stabilization.
• the first circuit 8 for connecting the first chamber 6 to the source 5 of fluid comprises a device 10 for at least partially closing the first circuit 8 and the second circuit 9 for connecting the second chamber 7 at the source 5 of fluid comprises a device 11 for at least partial closing of the second circuit 9.
• the device 11 for at least partial closing of the second circuit 9 is a pressure-sensitive closing device 11 comprising a sealing member 110, configured for, as a function of the fluid pressure prevailing on the first circuit 8 to 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 the fluid from the second chamber 7 of the jack 4 to the source 5 of fluid .
• This member 110 for closing the device 11 for at least partial closing of the second circuit 9 is configured to switch from the open position to the closed position of the second circuit 9 depending on the pressure prevailing on the first circuit 8, between the device 10 for at least partial closing of the first circuit 8 and the first chamber 6 of the actuator 4.
• the device 10 for at least partial closing of the first circuit 8 comprises at least one balancing valve 100A or an anti- piloted return and the at least one member 110 for closing the device 11 for at least partial closing of the second circuit 9 is configured to pass from the open position to the closed position of the second circuit 9 as a function of the pressure prevailing on the first circuit 8 between the balancing valve 100A or the controlled non-return valve of the device 10 for closing said first circuit 8 and the first chamber 6 of the jack 4.
• At least one member 110 for closing the device 11 for at least partial closing of the second circuit 9 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 a circulation of fluid in the second circuit 9 from the second chamber 7 of the cylinder 4 to the source 5 of fluid is prevented, may be a balancing valve or a controlled non-return valve.
• the member 110 for closing the device 11 for at least partial closing of the second circuit 9 is a balancing valve.
• the device 11 for closing the second circuit 9 comprises a balancing valve in parallel with a non-return valve.
• the balancing valve arranged on a so-called main branch of the second circuit is a valve loaded by spring and controllable according to the pressure prevailing on the first circuit 8 between the device 10 for at least partial closing of the first circuit 8 and the first chamber 6 of the cylinder 4.
• the balancing valve prevents a flow of hydraulic fluid from the cylinder 4 as long as the pressure of the hydraulic fluid is below a predetermined threshold value.
• Such a balancing valve allows the passage of hydraulic fluid only in one direction.
• This balancing valve forms the shutter member 110 of the closure device 11 configured to go from the open position to the closed position of the second circuit 9 as a function of the pressure prevailing on the first circuit 8, between the device 10 of at least partial closure of the first circuit 8 and the first chamber 6 of the cylinder 4.
• This 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 the at least one closure member 110 of the at least partial closure device of the second circuit is sensitive to pass from the open position to the closed position is free of closure member.
• This portion of the first circuit 8 extends downstream of the device 10 for at least partial closing of the first circuit taken in the direction of flow of the fluid from the source 5 of fluid to the jack 4.
• this position of the first circuit 8 extends downstream of the balancing valve 100A or the controlled non-return valve of said first circuit taken with respect to the direction of flow of the fluid from the source 5 of fluid to the cylinder 4, in particular the first chamber of the cylinder 4
• the second circuit 9 comprises on a branch branch of the main branch making it possible to bypass the closure member 110, a non-return valve loaded by a spring. This check valve return prevents, in the closed position, the flow of fluid from the second chamber 7 to the source 5 of fluid.
• the balancing valve constituting the shutter member 110 provided on the main line of the second circuit 9 can be in the closed position without affecting the possibility of supplying fluid to the second chamber 7 via the branch branch fitted with a non-return valve. It is for this reason that the closure device 11 is called the at least partial closure device 11, since the circulation of the fluid from the source 5 of fluid to the second chamber 7 cannot be prevented when the pressure of the fluid coming from the source 5 of fluid is greater than a predetermined pressure value.
• the shutter member 110 of the closing device 11 formed by the balancing valve fitted to the main branch of the second circuit 9, is configured to go 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 jack 4 to the source 5 of fluid is prevented when the pressure prevailing on the first circuit 8 between the device 10 for at least partial closing of the first circuit 8, in particular between the or one of the balancing valves 100A or the one or one of the non-return valves of the device 10 for closing the first circuit 8 and the first chamber 6 of the jack is below a predetermined threshold value.
• the shutter member 110 of the closure device 11 formed by the valve fitted to the main branch of the second circuit 9, is configured to pass from the closed position of the second circuit 9 in which a circulation of fluid from the second chamber 7 of the cylinder 4 towards the source 5 of fluid is prevented from the open position of the second circuit when the pressure prevailing on the first circuit 8 between the device 10 for at least partial closing of the first circuit 8 and the first chamber 6 of the jack is greater than a value predetermined threshold.
• the balancing valve constituting the closure member 110 could have been replaced by a controlled non-return valve without departing from the scope of the invention.
• the device 10 for at least partial closure of the first circuit 8 is a pressure-sensitive closure device 10, comprising a closure member 100 configured for, as a function of the fluid pressure prevailing on the second circuit 9, moving 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 source 5 of fluid is prevented.
• the shutter member 100 of the device 10 for at least partial closing of the first circuit 8 is configured to switch from the open position to the closed position of the first circuit 8 as a function of the pressure prevailing on the second circuit 9 between the device 11 for at least partial closing of the second circuit 9 and the source 5 of fluid to which the second circuit 9 is connected.
• This device 10 for at least partial closing of the first circuit 8 comprises, similarly to the device 11 for at least partial closing of the second circuit 9, a balancing valve in parallel with a non-return valve.
• the balancing valve prevents a flow of hydraulic fluid from the cylinder 4 as long as the pressure of the hydraulic fluid is below a predetermined threshold value.
• Such a balancing valve allows the passage of hydraulic fluid only in one direction. This is why it is mounted in parallel with a non-return valve which allows circulation of pressurized hydraulic fluid in the direction opposite to the flow allowed by the balancing valve.
• this balancing valve arranged on a so-called main branch of the first circuit, is a valve loaded by spring and controllable, in particular according to the pressure prevailing on the second circuit 9 between the device 11 for closing at least partial of the second circuit 9 and the source of fluid 5.
• This balancing valve forms the closure member 100 of the closure device 10 configured to go from the open position to the closed position of the first circuit 8 as a function of the pressure prevailing on the second circuit 9 between the device 11 for at least partial closing of the second circuit 9 and the source 5 of fluid to which the second circuit 9 is connected.
• the closure member 100 of the device 10 for at least partial closure of the first circuit 8 configured for, depending on the fluid pressure prevailing on the second circuit 9, moving 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 non-return valve which serves to delimit the portion of the first circuit 8 extending between the device 10 for at least partial closing of the first circuit 8 and the first chamber 6 of the jack 4 and to the pressure of which the at least one closure member 110 of the at least partial closure device of the second circuit is sensitive to go from the open position to the closed position.
• the first circuit 8 comprises, on a branch branch of the main branch making it possible to bypass this balancing valve, a non-return valve loaded by a spring, this non-return valve preventing, in the closed position, the circulation of fluid from the first chamber 6 to the source 5 of fluid.
• the balancing valve constituting the closure member 100 provided on the main line of the first circuit 8 can be in the closed position without affecting the possibility of supplying the first chamber 6 with fluid via the branch. bypass equipped with a non-return valve.
• closure device 10 is called at least partial closure device, because the flow of fluid from the source 5 of fluid to the first chamber 6 cannot be prevented when the fluid pressure from the fluid source 5 is greater than a predetermined pressure value.
• the closure device 10 and in particular the closure member 100 fitted to the main branch of the first circuit 8 is configured to go 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 device 11 for at least partial closing of the second circuit 9 and the source of fluid from the jack is less than a predetermined threshold value.
• the machine 1 further comprises 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 closing of the first circuit 8 and the first chamber 6 of the jack 4.
• This device 14 for determining the pressure can be a pressure sensor or a pressure switch arranged in the first chamber 6 of the jack or on the portion of the first circuit connecting this first chamber 6 to the device 10 for at least partial closing of the first circuit 8.
• control unit 13 The value of the pressure or a signal, depending on the pressure, is sent to the control unit 13.
• This control unit 13 comprises electronic and / or computer data processing means such as a microprocessor associated with a working memory.
• control unit When the phrase "control unit is configured for" is used, it means that the microprocessor understands instructions to perform the action.
• the control unit 13 is therefore configured to control the transmission of a signal, for example light at the level of the transmission device 12 arranged in the cockpit, at the level for example of the dashboard when the measured pressure is less than a predetermined value, which means that the stabilization leg 3 is in the inactive position.
• a signal for example light at the level of the transmission device 12 arranged in the cockpit, at the level for example of the dashboard when the measured pressure is less than a predetermined value, which means that the stabilization leg 3 is in the inactive position.
• the control of the cylinder 4 and the passage of the stabilizing leg 3 from an inactive position to an active position take place as follows: it is assumed that the cylinder rod is retracted, as in the first diagram , at the top left of FIG. 4. The stabilization leg 3 is therefore in the inactive position.
• the driver of the machine controls, using a control member such as a lever, the actuation of the cylinder 4 in the direction of an exit of the rod of the cylinder for the passage from an inactive position to an active position.
• This control by the operator causes a displacement of the distributor 53 and the operation of the pump 52 to allow the supply of fluid, in particularly in oil, from the first chamber 6 of the cylinder and the release of the second chamber 7 of the cylinder by passage of the member 110 of the closing device 11 fitted to the second circuit 9 in the open position, while the first chamber 6 of the cylinder is supplied via the bypass branch of the first circuit 8 provided with the non-return valve.
• the closure member 100 of the first closure device 10 therefore remains in the closed position.
• the distributor 53 When the driver of the machine stops acting on the actuator control member 4 in the direction of 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.
• the cylinder rod can be driven moving in the direction of an exit under the effect of the weight of the leg, as illustrated in the penultimate diagram of FIG. 4.
• This exit of the rod makes it possible to drop the pressure in the first chamber 6 of the cylinder 4, up to a pressure below a predetermined threshold value, so that the member 110 for shutting off the device 11 for closing the second circuit 9 goes into the closed position of said circuit and any circulation of fluid from the second chamber 7 to the fluid source 5 is prevented.
• the retraction of the cylinder rod for the passage from the active position of the stabilizing leg 3 to an inactive position is effected by the supply of the second chamber 7 of the jack, as illustrated in the second diagram of FIG. 5, using the distributor 53 and the pump 52, while the member 100 for closing off the device 10 for closing the first circuit 8 is also brought in the open position under the effect of the pressure prevailing on the second circuit 9 between the device 11 for at least partial closing of the second circuit 9 and the source 5 of fluid to which the second fluid circuit is connected.

Landscapes

• Engineering & Computer Science (AREA)
• Transportation (AREA)
• Structural Engineering (AREA)
• Mechanical Engineering (AREA)
• Civil Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Geology (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Fluid-Pressure Circuits (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=68988006

Family Applications (1)

Country Status (3)

Family Cites Families (5)

• 2019
  • 2019-10-07 FR FR1911078A patent/FR3101591B1/fr active Active
• 2020
  • 2020-10-06 WO PCT/FR2020/051745 patent/WO2021069826A1/fr not_active Ceased
  • 2020-10-06 EP EP20796636.7A patent/EP4041668B1/de active Active

Also Published As

Similar Documents

Legal Events