The present invention relates to the field of mobile elevating work platforms for personnel (also designated by the acronym MEWP), also commonly referred to as aerial work platforms. It relates more particularly to an aerial work platform comprising an auxiliary control station making it possible to control it from the ground.
Aerial work platforms are machines intended to enable one or more persons to work at a height.
The lifting mechanism 8 is often arranged on a turret 4 that is mounted so as to pivot about a vertical axis on the chassis 2, which makes it possible to change the orientation of the lifting mechanism 8—and therefore of the platform 10—with respect to the chassis 2. The chassis is generally equipped with wheels 6 or tracks making it possible to move the aerial work platform on the ground. It is usually motorised to allow autonomous movement of the aerial work platform on the ground.
The platform 10 is equipped with a control station 12 enabling an operator on board the platform 10 to cause the movement of the platform in order to reach the required working position.
These aerial work platforms may also comprise an auxiliary control station 20 enabling an operator to control a movement of the aerial work platform from the ground. The auxiliary control station 20 is generally mounted on a lateral side of the chassis 2 or of the turret 4.
One example of an auxiliary control station 20 of the prior art is illustrated in
To avoid the risk of unwanted movement, the auxiliary control station 20 often comprises a validation button 24, in this case in the form of another lever-type push button. In other words, the function of the buttons 22 is inhibited in the absence of simultaneous actuation of the validation button 24. The auxiliary control station 20 generally also comprises other members such as a key switch 26 for starting the aerial work platform or an emergency stop button 28, as well as display members.
The applicant has identified a particular problem, unknown until now, in the case where these aerial work platforms are transported on site. This is because, depending on the circumstances, these aerial work platforms are transported by lorry to their work sites, for example a construction site. The aerial work platforms are then in a compact transport position, that is to say the lifting mechanism 8 is in a position completely folded on the chassis 2 or the turret 4, the platform 10 is inclined so as to be positioned under the lifting mechanism 8 and thus to reduce the total length of the machine, and the turret 4 is oriented so that the lifting mechanism 8 is arranged along the longitudinal mid-plane of the chassis 2. This position is illustrated by
The operation of loading or unloading the aerial work platform onto or from the lorry—referenced 30—generally consists of running it from the ground onto the bed of the lorry or a trailer 31—and vice versa—by means of movable loading ramps 32. For this purpose, the operator on board the platform 10 uses the control station 12 to move the aerial work platform into a position of moving on the ground—illustrated in
Once placed on the lorry, the operator moves the aerial work platform into its compact transport position. On the other hand, before unloading from the lorry, it is once again made to pass into the position of movement on the ground in
Passage from the position of movement on the ground to the compact transport position—and vice versa—is done by the operator by means of the auxiliary control station 20 since, for this operation, manipulation of the control station 12 is uncomfortable and dangerous because of the tilting and the high inclination of the platform 10 when passing from one to the other: cf. comparatively the position of the platform 10 in
One aim of the present invention is to remedy this drawback. For this purpose, the present invention proposes an aerial work platform comprising:
By virtue of this design, the operator can effectively hold onto the gripping handle—thus limiting the risk of falling—while simultaneously manipulating the control and validation members, including when he is standing in precarious stability at the control station arranged on the chassis or the turret, at the edge of the bed or trailer of a lorry on which the aerial work platform is loaded.
According to preferred embodiments, the invention comprises one or more of the following features:
Other aspects, features and advantages of the invention will emerge from a reading of the following description of a preferred embodiment of the invention, given by way of example and with reference to the accompanying drawing.
With reference to
It will be understood that the auxiliary control stations according to the invention may be arranged on any type of aerial work platform other than the one illustrated by
The auxiliary control station 50 is preferentially arranged on one side of the turret 4—or according to circumstances of the chassis 2—of the aerial work platform 1. It is preferably a lateral side of the chassis 2 or of the turret 4 according to circumstances, so that the operator can have a better direct view onto the lifting mechanism 8 and the platform 10 in order to control movement thereof more easily. It will be understood that the lateral sides of the chassis 2 and of the turret 4 are defined as being the sides on either side of the longitudinal mid-plane of the chassis 2, the turret 4 being positioned so that the lifting mechanism 8 is in this plane. The auxiliary control station 50 is preferentially arranged vertically at this side of the chassis 2 or of the turret 4. In other words, the various members of the auxiliary control station 50—which will be detailed below—are arranged on a substantially vertical surface.
The auxiliary control station 50 comprises a plurality of manually actuated control members—referenced overall by 52 in
The auxiliary control station 50 comprises a manually actuated validation member 54. In the absence of actuation of the validation member 54, the control members 52 are inhibited. Thus, in the absence of simultaneous actuation of the validation member 54, actuation of any of the control members 52 does not cause movement of the aerial work platform 1. In other words, for any control member 52 to be able to cause the corresponding movement of the aerial work platform 1, it is necessary to simultaneously actuate the validation member 54. It will be understood that, as soon as manual actuation of the validation member 54 ceases, the control members 52 are once again inhibited.
The auxiliary control station 50 also comprises a gripping handle 70 that is best visible in
In our example, the handle 70 has a gripping part 72—that is to say the part of the handle 70 that is designed to be gripped with one hand—that is delimited by two notional planes 72a, 72b visible in
The validation member 54 can be implemented by any other suitable technology and in any other arrangement with respect to the handle 70. According to a variant, it is implemented in the form of a trigger arranged under the gripping part 72 of the handle 70 and intended to be actuated with the index finger of the hand gripping the 1handle 70. According to another variant, the validation member 54 is arranged not on the handle 70 but adjacent thereto with sufficient proximity to be able to be actuated with one of the fingers—preferably the thumb—of the hand that simultaneously grips the handle 70. It may in particular be a key of the membrane keypad already mentioned with regard to the control members 52.
Whatever the configuration of the handle 70 and the relative arrangement of the validation member 54 and handle 70, it is preferable for the distance D between the validation member 54 and the gripping part 72 of the handle 70 to be less than or equal to 10 cm, and more preferentially less than or equal to 6 cm, which enables an operator of average size to grip the handle 70 and to simultaneously actuate the validation member 54 with the same hand comfortably.
The mutual arrangement of the control members 52, the handle 70 and the validation member 54 is chosen so that the same operator can simultaneously hold the handle 70 and actuate the validation member 54 with one of his hands and actuate any of the control members 52 with his other hand. From this point of view, the control members 52 are preferably each situated at a horizontal distance from the validation member 54 that is less than 1.3 m, more preferentially less than 1 m: in
In the example illustrated, all the control members 52 are arranged on the right-hand side with respect to the handle 70. Because of this, the auxiliary control station 50 is designed to grip the handle 70 and to actuate the validation member 54 with the left hand and to simultaneously actuate any of the control members 52 with the right hand. This arrangement may be reversed. Alternatively, all the control members 52 may be arranged above the handle 70 or vice versa. In any event, it is preferable to arrange all the control members 52 on the same side—lateral or in height—of the handle 70 in order to avoid the operator having to cross his arms or change hand in order to access the various control members 52.
Naturally, the auxiliary control station may comprise other members such as a member or switch 56 for starting the aerial work platform or an emergency stop button 58, as well as display members. It is advantageous for these other members also to be arranged so that the operator can actuate any of them with one hand while he is holding the handle 70 with his other hand.
It is advantageous for the auxiliary control station 50 to be produced in the form of a console 51 preferentially carrying all its components: control members 52, validation member 54, handle 70, etc. This facilitates the mounting of the auxiliary control station 50 on the chassis 2 or turret 4, as well as maintenance thereof. Naturally the general form of the console 51 may be different from the one shown in
The auxiliary control station 50 may be arranged on the chassis 2 or the turret 4 in a fixed immobile fashion, that is to say without any possibility of change in position.
Alternatively, the auxiliary control station 50 may be mounted thereon so as to be able to be moved by the operator with respect to the chassis 2 or turret 3 according to circumstances.
In the second extreme position, the auxiliary control station and the handle thereof are referenced 50′ and 70′ respectively. In this position, the auxiliary control station projects with respect to the side of the turret 4 or of the chassis 2 according to circumstances. This position advantageously procures for the operator O better visibility of the work platform 10 and of the lifting mechanism 8 when he stands at the auxiliary control station.
The angular movement between these two extreme positions is referenced α. The angular movement α is preferably at least 30°, more preferentially at least 45°, more advantageously at least 60°. It is preferably 90° at a maximum.
A device for holding the auxiliary control station 50 in position—not shown—enables the operator to manually select the required angular holding position of the auxiliary control station 50 with respect to the turret 4 or to the chassis 2 according to circumstances. This device may be of any suitable type, for example a notched wheel sector, mounted fixed at the axis V, and a rod mounted so as to slide in the console forming the auxiliary control station and cooperating with the notches on the notched wheel sector, the rod being elastically biased towards the notched wheel sector and designed to be able to be actuated manually by the operator in order to modify the angular position of the auxiliary control station.
The handle 70 may advantageously serve to pivot the auxiliary control station 50.
In a variant, the auxiliary control station 50 is divided into two parts, one comprising the handle 70 and the validation member 54, which are mounted fixed and immobile on the chassis 2 or the turret 4 according to circumstances, and the other part being made in the form of a console carrying in particular the control members 52 and which is mounted so as to pivot on the chassis 2 or on the turret 4 according to circumstances, as described previously with reference to
It is preferable also to provide a device for holding the auxiliary control station 50 in position—not shown—to enable the operator to manually select the required horizontal holding position of the auxiliary control station 50 with respect to the turret 4. This device may be of any suitable type, for example a rack mounted fixed on the turret 4 and a rod mounted so as to slide in the console forming the auxiliary control station and cooperating with the notches on the rack, the rod being elastically biased towards the rack and designed to be able to be actuated manually by the operator. There also, the handle 70 may serve to slide the auxiliary control station 50.
The two methods of mounting the auxiliary control station 50 described with reference to
In these various methods of mounting the auxiliary control station 50 that make it possible to modify the positioning thereof with respect to the chassis 2 or the turret 4, the electrical connections between the auxiliary control station 50 and the chassis 2 or turret 4 may be made with one or more flexible electrical cables or a cluster of flexible electrical cables.
Naturally the present invention is not limited to the examples and embodiment described and depicted, but is capable of numerous variants accessible to a person skilled in the art.
It will be understood that the possibilities of pivoting and sliding of the auxiliary control station 50 described with reference to
In particular, the console may be mounted so as to be able to pivot about an axis vertical to the chassis or to the turret to make it possible to change the angular position of the console with respect to the chassis or turret. Alternatively or additionally, the console is mounted so as to slide horizontally on the turret. A device for holding the console in position may be provided, making it possible to manually select an angular and/or horizontal position of holding the console with respect to the chassis or turret.
Number | Date | Country | Kind |
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1657284 | Jul 2016 | FR | national |
Filing Document | Filing Date | Country | Kind |
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PCT/FR2017/052010 | 7/21/2017 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
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WO2018/020114 | 2/1/2018 | WO | A |
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