Alert method for an aerial work platform, including an articulated boom lift, and associated aerial work platform

Abstract

Warning Method for an Aerial Work Platform, Particularly an Articulated Boom Lift, and Associated Aerial Work Platform. The present invention relates to a warning method for alerting an operator (22) in a basket (20) of an aerial work platform (10) during a phase of movement of the basket (20) relative to the ground (14). The aerial work platform (10) comprises a chassis (12) with wheels (14), a basket (20), configured to receive an operator (22), and a lifting device (30), which is configured to move the basket (20) upwards.While the basket (20) is in motion, the alerting method comprises an evaluation phase, during which the acceleration of the loaded basket (20) is assessed by means of an acceleration sensor (40), and an alert phase, during which, if the acceleration assessed during the evaluation phase exceeds a predetermined first acceleration threshold (A1), then a first alert signal is emitted, by means of a first alerting device (25A) of the lifting platform (10), to the operator (22) present in the basket (20). Figure for the abbreviation: Figure 2.

Description

Title of the invention: Warning method for an aerial work platform, in particular an articulated aerial work platform, and associated aerial work platform

[0001] The present invention relates to an alert method for an aerial work platform, in particular an articulated platform, as well as an aerial work platform configured to implement such an alert method.

[0002] A lifting platform is a mobile elevating work platform for personnel. Several types of lifting platforms are known, including articulated boom lifts, mast lifts, telescopic boom lifts, scissor lifts, etc. A lifting platform—also simply called a "boom"—comprises a chassis, which is mounted on wheels to allow movement of the platform on the ground, a basket, and a lifting device, which is interposed between the basket and the chassis so as to adjust the height of the basket relative to the chassis. The lifting device generally includes at least one actuator, for example, a hydraulic cylinder, which is arranged to extend or retract the lifting device, raising or lowering the basket. The basket, which is attached to the chassis, thus moves relative to the ground when the chassis moves relative to the ground, and also moves vertically under the effect of the lifting device.

[0003] In the case of an articulated boom lift, the lifting device is a lifting arm, which is articulated relative to the chassis and often includes a telescopic section. The basket comprises a platform surrounded by a guardrail and is designed to accommodate one or more people and possibly also loads such as tools and / or materials.

[0004] The aerial work platform is intended to be used in various configurations. For example, the aerial work platform is generally transported in its folded configuration by truck to an unloading location near its final place of use. Then, during an approach phase, the aerial work platform is moved by rolling on the ground from the unloading location to the place of use, the platform generally being in its folded configuration. Typically, during the approach phase, the articulated boom travels at a moderate speed, with the rolling speed of the articulated boom being typically limited to a walking speed of approximately 5 km / h. Once the aerial work platform arrives at the place of use, the lifting device is extended to the desired height for working at height.If necessary, the aerial work platform can still be moved with the lifting device in the raised position, but at a reduced speed, for example less than 1 km / h, in order to reduce the risk of accidents when the operator is at height. The reduced speed is generally defined by safety standards.

[0005] When the articulated platform rolls over uneven ground, the operator in the basket may experience accelerations that could cause them to lose their balance, potentially resulting in injury or even being ejected from the basket. Similarly, when the basket is raised or lowered by the lifting device, if the basket collides with an obstacle, the operator is subjected to accelerations that could destabilize them. More generally, the operator is subjected to accelerations whenever the basket is moving relative to the ground, whether horizontally or vertically.

[0006] DE-10 2019 213 972-A1 proposes, for example, to calculate the platform's acceleration based on the platform's height, the articulated boom's travel speed, and a previously recorded profile of the road section on which the articulated boom is traveling. If the acceleration is too high, the speed is reduced and / or an alert is issued to the operator. However, this approach remains limited to travel on roads whose profile has been previously analyzed and recorded.

[0007] It is these problems that the invention intends to remedy in particular, by proposing an alert method in case of an inappropriate situation, which is applicable regardless of the configuration of the road or the location of the lifting platform, and in an autonomous manner.

[0008] To this end, the invention relates to an alerting method for alerting an operator in a basket of a lifting platform during a phase of movement of the basket relative to the ground, in which: - The lifting platform includes: • a chassis with wheels, the chassis being configured to move on the ground by rotating the wheels, the lifting platform being in a movement phase, • a basket, configured to receive an onboard load including an operator and, possibly, one or more other people, as well as objects such as tools and / or materials, the basket, the operator and any objects and people onboard the basket forming a loaded basket, and • a lifting device, which connects the basket to the chassis and is configured to move the basket relative to the ground between a low position, in which the lifting device is in a folded configuration, and a high position, in which the lifting device is in a deployed configuration, - while the basket is in a movement phase, the alert method includes an evaluation phase, during which the acceleration of the loaded basket is assessed using an acceleration sensor, - the alert method also includes an alert phase, during which, if the acceleration assessed during the assessment phase is greater than a first predetermined acceleration threshold, then a first alert signal is issued, by means of a first alert device of the lifting platform, to the attention of the operator present in the basket.

[0009] Thanks to the invention, the operator in the basket receives an alert as soon as the acceleration of the loaded basket exceeds a predetermined threshold, which generally indicates that the aerial work platform is moving too fast given the uneven ground. The alerted operator then becomes aware of the potential danger and, if necessary depending on the overall ground conditions, reduces the aerial work platform's speed, thereby reducing the risk of an accident. The alert method is based on measurements from sensors onboard the aerial work platform and on calculations performed using these measurements. The alert method can be implemented autonomously, regardless of the aerial work platform's location, and in particular without prior mapping.

[0010] According to advantageous but not mandatory aspects of the invention, such an alerting method may incorporate one or more of the following features taken individually or in any technically permissible combination: - The acceleration sensor is an accelerometer, which is attached to the basket and is configured to measure accelerations experienced by the loaded basket. - The acceleration sensor is a load sensor, which is interposed between the lifting device and the basket; the load sensor is configured to measure the total mass of the loaded basket. - The alert method includes an initial phase, which precedes the evaluation phase and during which a static load is measured on the loaded basket using the load sensor while the basket is stationary; the static load is proportional to the force exerted by the loaded basket on the lifting device.

[0011] whereas subsequently, during the evaluation phase: • The load sensor measures a dynamic load on the loaded basket, which is proportional to the force exerted by the loaded basket on the lifting device, and • then, using a calculator on the lifting platform, the acceleration of the loaded basket is calculated, the acceleration of the loaded basket being proportional to the dynamic load divided by the static load. - The static load, measured during the initial phase, is a vertical component of the force exerted by the loaded basket on the lifting device, and

[0012] The dynamic load, measured during the evaluation phase, is a vertical component of the force exerted by the loaded basket on the lifting device. - During the alert phase, if the acceleration of the loaded basket exceeds a second predetermined acceleration threshold, the second threshold being strictly greater than the first threshold, then a second alert signal is transmitted by means of a second alert device: • for the attention of a remote operator, the second alert device including means of transmission, and / or • for the attention of persons around the lifting platform, the second warning device including audible and / or visual warning means. - The basket movement phase is a ground-based movement phase of the lifting platform, while the chassis moves on the ground, and the height of the basket relative to the ground is fixed.

[0013] the first acceleration threshold depends on a speed of movement of the lifting platform. - The lifting platform is configured to move on the ground at a speed chosen by the operator in the basket, the speed being less than a maximum speed,

[0014] while an intermediate speed threshold is defined, which is non-zero and strictly less than the maximum speed,

[0015] that if the speed of movement is less than the intermediate speed threshold, then the first acceleration threshold is equal to a first value, whereas if the speed of movement is between the intermediate speed threshold and the maximum speed, then the first acceleration threshold is equal to a second value, which is different from the first value,

[0016] and that the first value is greater than the second value. - The first acceleration threshold depends on the height of the basket. - The basket movement phase is a basket lifting phase, as the lifting device raises or lowers the basket.

[0017] whereas the first acceleration threshold depends on a height of the basket.

[0018] The invention also relates to an elevating platform, in particular an articulated platform, the elevating platform comprising: - a chassis with wheels, the chassis being configured to move on the ground, - a basket, configured to hold at least one operator and, possibly, items such as tools and / or materials, - a lifting device, which connects the basket to the chassis, the lifting device being configured to move the basket relative to the ground between a low position, in which the lifting device is in a folded configuration, and a high position, in which the lifting device is in a deployed configuration, - a calculator, configured to record the values ​​measured by the load sensor, and to perform calculations based on the measured values, - an alert device, configured to emit an alert signal to an operator present in the basket,

[0019] while the lifting platform is configured to implement the alerting method as described above.

[0020] Advantageously: - The lifting platform is an articulated platform, the lifting device being a lifting arm, which is connected to the basket by a joint, - the acceleration sensor is a load sensor, which is interposed between the lifting arm and the basket, the load sensor being configured to measure the force exerted by the loaded basket on the lifting arm both when the basket is stationary relative to the ground and when the basket is moving relative to the ground.

[0021] The invention will be better understood, and other advantages thereof will become more apparent in the light of the following description of several embodiments of an alerting method and a lifting platform, conforming to its principle, given solely by way of example and with reference to the accompanying drawings, in which:

[0022] - [Fig. 1] [Fig. 1] is a side view of a lifting platform conforming to the invention, represented in a lowered configuration;

[0023] - [Fig.2] [Fig.2] is a view analogous to [Fig.1], the lifting platform being represented in a deployed configuration;

[0024] - [Fig.3] [Fig.3] is a synoptic diagram illustrating an alerting method in accordance with the invention, and

[0025] - [Fig.4] [Fig.4] represents, on two insets a) and b), examples of abacuses used in alerting methods in accordance with the invention.

[0026] A lifting platform 10 is shown in [Fig. 1]. The lifting platform 10, also referred to simply as the "platform" in this description, comprises a chassis 12, which rests on a floor 14 by means of wheels 16. The chassis 12 is configured to move on the floor 14 by rotating the wheels 16. The lifting arm 10 is then in a movement phase. When the wheels 16 are not rotating, the chassis 12 is stationary relative to the ground 14, or simply said to be "stationary". The ground 14 is assumed here to be horizontal, the following description being given in relation to the orientation of the parts as shown in the figures, bearing in mind that this may be otherwise in reality.

[0027] The platform 10 also includes a basket 20. The basket 20 comprises a platform 21A and a guardrail 21B, which surmounts the platform 21A. The basket 20 is configured to receive an onboard load, which includes in particular an operator 22. The basket 20 is equipped with a control panel 24, by which the operator 22 controls the platform 10, in particular by which the operator controls the ground movement of the platform 10, the height of the basket 20, etc. The basket 20 is also configured to receive, where applicable, one or more other persons, as well as objects such as tools and / or materials. The basket 20, the operator 22, and any objects and persons onboard the basket together form a so-called "loaded" basket 20.

[0028] The elevating work platform 10 also includes a first warning device 25A. The first warning device 25A, represented here schematically by an indicator light located on the control panel 24, is configured to emit a first warning signal to the operator 22 present in the basket 20. In the illustrated example, the first warning signal is thus a light signal. Alternatively or in addition, the warning device 25 includes audible warning means.

[0029] Advantageously, the lifting platform 10 also includes a second warning device 25B. The second warning device 25B is schematically represented here by an antenna attached to the chassis 12.

[0030] In the illustrated example, the second warning device 25B includes transmission means, in particular by radio frequency, and is configured to transmit a second warning signal to a so-called "remote" operator. The remote operator, who is not shown, is for example a manager of the aerial work platform 10, or an operations supervisor, a safety manager, etc.

[0031] Alternatively or in addition, the second warning device 25B is also configured to emit a warning signal to persons in the vicinity of the elevating platform 10. The second warning device 25B then includes audible warning means – for example, a horn – and / or visual warning means – for example, a flashing beacon. The expression "in the vicinity of the elevating platform 10" refers to persons who are near the elevating platform 10, for example, on the ground 14, but who are not in the basket 20.

[0032] The platform 10 also includes a lifting device 30. The lifting device 30 connects the basket 20 to the chassis 12 and is configured to lift the basket 20 relative to the The chassis 12 moves between a lowered position, in which the lifting device 30 is in a folded configuration, and a raised position, in which the lifting device 30 is in an extended configuration. In [Fig. 1], the platform 10 is shown in the folded configuration, while in [Fig. 2], the platform 10 is shown in the extended configuration. By extension, when the lifting platform 10 is in the folded configuration, the lifting device 30 is also said to be in a folded configuration, while when the lifting platform 10 is in the extended configuration, the lifting device 30 is also said to be in an extended configuration. The height of the basket 20 relative to the chassis 12, and by extension relative to the ground 14, is controlled by the operator 22 using the control panel 24.

[0033] Thus the lifting device 30 is configured to move the basket 20 relative to the ground 14, according to a movement substantially orthogonal to the ground 14, while the chassis 12 is configured to move the basket 20 relative to the ground 14, according to a movement substantially parallel to the ground 14.

[0034] In the illustrated example, the lifting device 30 is a lifting arm 32, which is connected to the platform 20 by a joint 33. The joint 33 is configured, in particular, to keep the platform 21A substantially parallel to the ground 14 when the basket 20 is raised or lowered by the lifting arm 32. The lifting platform 10 is thus an articulated platform. The principles of the invention, described with reference to the articulated platform shown in the drawings, are applicable to other types of lifting platforms 10, in particular scissor lifts, telescopic lifts, mast lifts, etc. The lifting device 30 also includes an actuator 34, here a hydraulic cylinder, which is configured to control the deployment of the lifting device 32.

[0035] A phase of operation of the lifting platform 10, called the "approach phase," is defined, during which the lifting platform 10 moves along the ground while maintaining the lifting device 30 in its folded configuration. The approach phase is therefore a special case of the movement phase of the lifting platform 10.

[0036] The lifting platform 10 also includes an acceleration sensor 40, which is configured to measure the acceleration of the basket 20, in particular the loaded basket 20. Specifically, the acceleration sensor 40 is configured to measure the acceleration experienced by the loaded basket 20 when the lifting platform 10 is moving, particularly when the lifting platform 10 is approaching. It is understood that the values ​​measured by the acceleration sensor 40 vary continuously, in relation to, among other things, the speed of the lifting platform 10, the ground profile over which the platform 10 is moving, the height of the basket 20, etc. It thus measures a so-called "dynamic" load.

[0037] In the illustrated example, the acceleration sensor 40 is a load sensor 40A, which is interposed between the lifting device 30 and the basket 20, the load sensor 40A is configured to measure the total mass of the loaded basket 20, particularly when the basket 20 is stationary. The acceleration sensor 40 then measures a so-called "static" load, which is proportional to the force exerted by the loaded basket 20 on the lifting device 30.

[0038] In the illustrated example, the lifting platform 10 is an articulated platform, and the load sensor 40A is advantageously located at a junction of the lifting device 30 and the basket 20. In particular, the load sensor 40A is advantageously integrated into the joint 33. According to a non-limiting example, the load sensor 40A includes one or more strain gauges, which are positioned on elements of the joint 33 and which are configured to measure a force exerted by the loaded basket 20 on the lifting device 30, a total mass of the loaded basket 20 being deduced from this force measurement, according to known methods not detailed further in this description.

[0039] Other implementations of the load sensor are of course possible. According to an unrepresented variant, one or more load sensors are interposed between the lifting device 30 and the platform 21A, in other words between the lifting device 30 and the basket 20, so as to measure a total load on the basket 20. For example, four load sensors are located at the four corners of the platform 21A and support the platform 21A, the platform 21A generally being rectangular.

[0040] The lifting platform 10 advantageously includes a calculator configured to calculate, from the static and dynamic load measurements of the loaded basket 20, an acceleration value experienced by the basket 20 when the basket 20 is in motion, here in a parallel motion phase to the ground 14. The acceleration of the loaded basket 20 is thus proportional to the dynamic load divided by the static load. The calculator, which is not shown, is, for example, integrated into the control panel 24.

[0041] The lifting platform 10 is configured to implement an alerting method according to the invention, an example of the alerting method being detailed below, with reference to [Fig.3].

[0042] The alert method includes an initial phase 100, during which a static load on the loaded basket 20 is measured by means of the load sensor 40A and while the lifting platform 10 is stationary, the static load being proportional to a force exerted on the loaded basket 20 on the lifting device 30.

[0043] The alerting method also includes an evaluation phase 101, which is subsequent to the initial phase 100 and during which an acceleration A101 of the loaded basket 20 is evaluated by means of the acceleration sensor 40 while the basket 20 is moving relative to the ground 14. In a first example, the lifting platform 10 is in the movement phase, and basket 2 is moving parallel to the ground 14.

[0044] In the illustrated example, the acceleration A101 of the loaded basket 20 is evaluated by measuring the dynamic load of the basket, then calculating the acceleration of the loaded basket 20, using the calculator of the articulated platform, the acceleration of the loaded basket 20 being proportional to the dynamic load divided by the static load.

[0045] The alerting method also includes an alert phase 102, during which, if the acceleration evaluated during the evaluation phase 101 is greater than a first predetermined acceleration threshold Al, then a first alert signal is emitted, by means of the first alerting device 25A, to the attention of the operator 22 present in the basket 20.

[0046] Thus, when the operator receives the first warning signal emitted by the first warning device 25A, the operator becomes aware of the potential danger to which he is subjected and, if necessary, reduces the speed of movement of the lifting platform 20.

[0047] According to another advantageous aspect, if, during the alert phase 102, the acceleration A101 of the loaded basket 20 exceeds a predetermined second acceleration threshold A2, the second acceleration threshold A2 being strictly greater than the first acceleration threshold A1, then during the alert phase 102 a second warning signal is transmitted by means of the second warning device 25B. For example, the second warning signal is transmitted to the attention of a remote operator. Alternatively or in addition, the second warning signal is transmitted to the attention of persons located around the elevating platform 10.

[0048] The second acceleration threshold A2 is chosen for example so that its exceeding indicates an abnormal situation, potentially dangerous for the operator and / or causing damage to the lifting platform 10. The remote operator or people around the lifting platform 20, thus alerted, can then take the necessary measures, these measures including alerting emergency services, and / or scheduling a maintenance visit for the lifting platform 10, etc.

[0049] According to another aspect of the invention illustrated in [Fig.4], the first acceleration threshold Al advantageously depends on a ground-displacement speed V of the articulated platform 20.

[0050] Figure 4a) is a nomogram 41 comprising a curve C401 illustrating the evolution of the first acceleration threshold Al, expressed in m / s2 - meter per second squared - as a function of the ground speed V of the lifting platform 10, the speed V being expressed in m / s - meter per second - or in km / h.

[0051] Generally, the lifting platform 10 is configured to move on the ground at a speed of movement chosen by the operator 22 present in the basket 20, the speed of movement being less than a maximum speed Vmax of movement. The maximum speed Vmax depends advantageously on the configuration of the lifting device 30. According to a first, non-limiting example, when the lifting platform 10 is in its approach phase, in other words, when the lifting device 30 is in its folded configuration, the maximum speed Vmax is 5 km / h. According to a second, non-limiting example, when the lifting device 30 is in its deployed configuration, the maximum speed Vmax is strictly less than 5 km / h, for example, 2 km / h.

[0052] An intermediate speed threshold Vi is defined, the intermediate speed threshold Vi being non-zero and strictly less than the maximum speed Vmax. For example, the intermediate speed threshold Vi is equal to 40% of the maximum speed Vmax.

[0053] If the ground speed V of the nacelle 10 is less than the intermediate speed threshold Vi, then the first acceleration threshold Al is equal to a first predetermined value A401, whereas if the ground speed V is between the intermediate speed threshold Vi and the maximum speed Vmax, then the first acceleration threshold Al is equal to a second value A402. Advantageously, the first value A401 is greater than the second value A402.

[0054] The alert method according to the invention is thus implemented with acceleration thresholds that depend on the speed, so as to improve the relevance of the first alert signal in the event of exceeding the acceleration threshold, while reducing the number of false positives, which could "tire out" the operator 22, who would no longer pay attention to the first alert signal.

[0055] In the alternative example illustrated in Figure 4b), the first acceleration threshold Al and the second acceleration threshold A2 both vary as a function of the ground speed V of the lifting platform 20. Figure 4b) is a nomogram 42 comprising a first curve C421 illustrating the evolution of the first acceleration threshold Al as a function of the ground speed V of the lifting platform 20. The nomogram 42 also includes a second curve C422 illustrating the evolution of the second acceleration threshold A2 as a function of the ground speed V of the lifting platform 20.

[0056] A first speed threshold VI is defined, which is non-zero and strictly less than the maximum speed Vmax. A second speed threshold V2 is defined, which is intermediate between the first speed threshold VI and the maximum speed Vmax. For example, if the maximum speed Vmax is 5 km / h, the first speed threshold VI is 1 km / h, and the second speed threshold V2 is 2.5 km / h.

[0057] In the illustrated example, when the velocity V is less than the first velocity threshold VI, the first acceleration threshold Al is equal to a first value Al'. When the velocity V is between the first velocity threshold VI and the second threshold V2, the first acceleration threshold Al is equal to a second value Al”, which is strictly less than the first value Al' of the first acceleration threshold AL When the speed V is between the second speed threshold V2 and the maximum speed Vmax, the first acceleration threshold Al is equal to a third value Al'”, which is strictly less than the second value Al” of the first acceleration threshold Al.

[0058] Similarly, when the speed V is less than the first speed threshold VI, the second acceleration threshold A2 is equal to a first value A2'. When the speed V is between the first speed threshold VI and the second threshold V2, the second acceleration threshold A2 is equal to a second value A2”, which is strictly less than the first value A2' of the second acceleration threshold A2. When the speed V is between the second speed threshold V2 and the maximum speed Vmax, the second acceleration threshold A2 is equal to a third value A2'”, which is strictly less than the second value A2” of the second acceleration threshold A2.

[0059] More generally, it is understood that multiple approaches are possible to define, as a function of the speed of movement V of the lifting platform 20, one or more predetermined acceleration thresholds, so as to distinguish the "normal" operating situations of the lifting platform 20, where the operator 22 is not in danger and where no alert is necessary, from inappropriate situations, where it is necessary to alert the operator 22 so that he can reduce, if necessary, the speed of movement of the lifting platform 10, and from dangerous situations, where it is necessary to alert a remote operator, or the people located around the lifting platform, so as to provide assistance to the operator 22 embarked in the basket 20, or to organize an inspection of the lifting platform 10.

[0060] In the illustrated example, the acceleration sensor 40 is a load sensor 40A integrated into the joint 33. In an alternative not shown, the acceleration sensor 40 is arranged differently, for example integrated into the actuator 34.

[0061] In the illustrated example, the acceleration sensor 40 measures, during the initial phase 100, a vertical component of the force exerted by the loaded basket on the lifting device 30. When the ground 12 is horizontal, the acceleration sensor 40 thus measures the weight of the loaded platform 20. Similarly, the dynamic load, measured during the evaluation phase 101, is a vertical component of the force exerted by the loaded basket 20 on the lifting device 30.

[0062] According to an unshown embodiment, the acceleration sensor 40 is an accelerometer, which directly measures the accelerations experienced by the basket 20, without needing to calculate a ratio between the dynamic and static load measurements. In other words, the initial phase 100 can be omitted. For example, the acceleration sensor 40 is an accelerometer fixed to the platform 21 A.

[0063] In the illustrated example, the first acceleration threshold A1 and the second acceleration threshold A2 are evaluated based on the vertical components of the static or dynamic loads measured by the acceleration sensor. In an alternative not shown, other components—other than the vertical component—of the acceleration of the basket 20 are taken into account, for example, a longitudinal component of the acceleration of the basket 20, and / or a transverse component of the acceleration of the basket 20. The longitudinal component is substantially parallel to a direction of movement of the lifting platform 10 on the ground 12, while the transverse component is parallel to the ground 12 and orthogonal to the direction of movement of the platform 10 on the ground 12.

[0064] The embodiments and variants mentioned above can be combined with each other to generate new embodiments of the invention.

Claims

1. Demands Alerting method for alerting an operator (22) in a basket (20) of a lifting platform (10) during a phase of movement of the basket (20) relative to the ground (14), in which: • The lifting platform (10) comprises: • a chassis (12) with wheels (14), the chassis (12) being configured to move on the ground (14) by rotating the wheels (14), the lifting platform (10) being in a phase of movement, • a basket (20), configured to receive an onboard load including an operator (22) and, possibly, one or more other persons, as well as objects such as tools and / or materials, the basket (20), the operator (22) and any objects and persons onboard the basket (20) forming a loaded basket (20), and • a lifting device (30), which connects the basket (20) to the chassis (12) and which is configured to move the basket (20) relative to the ground (14) between a low position, in which the lifting device (30) is in a folded configuration, and a high position, in which the lifting device (30) is in a deployed configuration, • while the basket (20) is in a movement phase, the alerting method includes an evaluation phase (101), during which the acceleration of the loaded basket (20) is evaluated by means of an acceleration sensor (40, 40A), • the alert method also includes an alert phase (102), during which, if the acceleration assessed during the assessment phase (101) is greater than a first predetermined acceleration threshold (Al), then a first alert signal is emitted, by means of a first alert device (25A) of the lifting platform (10), to the attention of the operator (22) present in the basket (20) • the basket movement phase (20) is a ground movement phase of the lifting platform (10), while the c chassis (12) moves on the ground (14), and the height of the basket relative to the ground is fixed, • the first acceleration threshold (Al) depends on a ground speed (V) of the lifting platform (10).

2. Warning method according to claim 1, wherein: • the acceleration sensor (40) is an accelerometer, which is fixed to the basket (20) and which is configured to measure accelerations undergone by the loaded basket (20).

3. An alerting method according to claim 1, wherein: • the acceleration sensor (40) is a load sensor (40A), which is interposed between the lifting device (30) and the basket (20), the load sensor (40A) being configured to measure a total mass of the loaded basket (20), • the alerting method comprises an initial phase (100), which is prior to the evaluation phase (101) and during which, by means of the load sensor (40A) and while the basket (20) is stationary, a static load on the loaded basket (20) is measured, the static load being proportional to a force exerted on the loaded basket (20) on the lifting device (30), • then, during the evaluation phase (101): • a dynamic load on the loaded basket (20) is measured by means of the load sensor (40A), which is proportional to a force exerted by the basket (20) loaded onto the lifting device (30), and • then,Using a calculator for the lifting platform (10), the acceleration of the loaded basket (20) is calculated, the acceleration of the loaded basket (20) being proportional to the dynamic load divided by the static load.

4. Warning method according to claim 3, wherein: • the static load, measured during the initial phase (100), is a vertical component of the force exerted by the loaded basket (20) on the lifting device (30), and

5.

6. • the dynamic load, measured during the evaluation phase (101), is a vertical component of the force exerted by the loaded basket (20) on the lifting device (30). An alerting method according to any one of claims 1 to 4, wherein: • during the alert phase (102), if the acceleration of the loaded basket (20) is greater than a second predetermined acceleration threshold (A2), the second threshold (A2) being strictly greater than the first threshold (A1), then a second alert signal is transmitted by means of a second alert device (25B): • for the attention of a remote operator, the second alerting device (25B) including means of transmission, and / or • for the attention of persons around the lifting platform (10), the second warning device (25B) including audible and / or visual warning means. An alerting method according to any one of claims 1 to 5, wherein: • the lifting platform (10) is configured to move on the ground (14) at a travel speed (V) chosen by the operator (22) present in the basket (20), the travel speed being less than a maximum travel speed (Vmax), • We define an intermediate speed threshold (Vi), which is non-zero and strictly less than the maximum speed (Vmax), • if the speed of movement (V) is less than the intermediate speed threshold (Vi), then the first acceleration threshold (Al) is equal to a first value (A401), while if the speed of movement (V) is between the intermediate speed threshold (Vi) and the maximum speed (Vmax), then the first acceleration threshold (Al) is equal to a second value (A402), which is different from the first value (A401), • the first value (A401) is greater than the second value (A402).

7. Warning method according to any one of claims 1 to 6, wherein: • the first acceleration threshold (Al) depends on a basket height (20).

8. A lifting platform (10), in particular an articulated platform, the lifting platform (10) comprising: • a chassis (12) with wheels (14), the chassis (12) being configured to move on the ground (14), • a basket (20), configured to receive at least one operator (22) and, optionally, objects such as tools and / or materials, • a lifting device (30), which connects the basket (20) to the chassis (12), the lifting device (30) being configured to move the basket (20) relative to the ground (14) between a lower position, in which the lifting device (30) is in a folded configuration, and a higher position, in which the lifting device (30) is in a deployed configuration, • a computer, configured to record the values ​​measured by the load sensor (40, 40A), and to perform calculations from the measured values, • an alert device (25A),configured to emit an alert signal to an operator (22) present in the basket (20), wherein the lifting platform (10) is configured to implement the alert method according to any one of the preceding claims.

9. Lifting platform (10) according to claim 8, wherein: • the lifting platform (10) is an articulated platform, the lifting device (30) being a lifting arm (32), which is connected to the basket (20) by a joint (33), • the acceleration sensor (40) is a load sensor (40A), which is interposed between the lifting arm (30) and the basket (20), the load sensor (40A) being configured to measure the force exerted by the loaded basket (20) on the lifting arm (30) both when the basket (20) is stationary relative to rt to the ground (14) and when the basket (20) is moving relative to the ground (14).

Images