WO2011144734A1

WO2011144734A1 - Machine, notably site machine, with retractable system for protecting against falling an operator who is climbing on to the frame of the machine

Info

Publication number: WO2011144734A1
Application number: PCT/EP2011/058250
Authority: WO
Inventors: Thierry Partouche
Original assignee: Dynamic Consult Monaco
Priority date: 2010-05-20
Filing date: 2011-05-20
Publication date: 2011-11-24
Also published as: FR2960245A1

Abstract

The present invention relates to a machine comprising a frame (2) and a retractable system affording protection to an operator against falling from a top face of the frame, said system comprises safety elements (5, 6, 7) intended to be raised to form barriers at least partially delimiting a secured perimeter (19) for said operator on said top face, characterized in that at least one safety element is formed by a portion (5, 6, 7) of a wall (25, 26) or of the top face of said frame (2), the portion (5, 6, 7) is designed to be moved between a first position in which it is incorporated into the associated wall (25, 26) or into the top face of the frame (2) and a stood-up second position in which it is placed some distance away from the remainder of the wall (25, 26) or of the top face (27) by being stood up vertically or at an angle to the vertical. Application to all machines, notably to site machines or vehicles.

Description

"Machine, especially construction machinery, with retractable fall protection system of an operator climbing on the frame of the machine"

The present invention relates to a machine with a retractable fall protection system of an operator mounting on the frame of the machine. This retractable fall protection system thus protects the operator or operators working at height on the machine.

It is designated by the term machine all together, mobile or not, having a motor for the operation of an associated tool and / or for moving the assembly. In the case of a mobile assembly, it may for example be a vehicle.

Without this being limiting, the present invention finds a preferred application for a machine of the construction machine type, the latter carrying out or not displacements. This construction machine can be used, for example, for earthworks or mining. In what follows, the example of use of the machine according to the present invention will be illustrated by a mobile drilling machine but this is in no way restrictive.

Conventionally, a drilling apparatus comprises a tool assembly which is generally in the form of a drill arm, disposed at one end of the machine. When not used and especially when moving the machine, the drill arm can be folded against the upper face of the machine by extending in the length of the machine while it extends substantially vertically or slightly inclined relative to the vertical in the working position.

The construction machine further comprises a frame, generally larger than the tool assembly and capable of receiving a motor assembly therein, this motor assembly serving to drive the tool assembly and / or to move the motor assembly. machine, it is then mounted on displacement means, preferably on caterpillars. This frame extends in the length of the machine and it is against its upper face that rests or that extends at a short distance from this upper face and at least partially the drill arm when it is folded down . It is therefore advantageous that said upper face of the frame does not include elements that could hinder the folding of the drill arm.

During the work of the machine, the operator or operators of the machine are frequently obliged to mount on top of the frame of the machine, the upper face of the frame forming a working platform. They must work at a height of about two to three meters, a height that can easily reach a dozen meters when the machine is parked at the edge of a cliff, which can happen frequently during work of the machine.

Due to current standards and labor law, it is imperative that the operator or operators are secured when they are on the upper face of the frame. In addition, to be certain that this or these operators correctly and consistently implement a standardized security means, this means must be simple and quick to implement.

For all kinds of machines, it is known to secure the working height of operators to use a protection system in the form of barriers mounted on the work platform at height. These barriers are removable, they must be put in place by the operator (s) on the work platform and then removed from the platform once the work is done.

Alternatively, it is also known to use a booster nacelle connected to a machine external to the machine to secure. Another alternative is the use of an anchor mast fixed on the upper face of the frame of the machine and connected to each operator by a lifeline.

All these solutions have the disadvantage of being slow to set up and / or require additional gear. In addition, any solution to increase security would be appreciated. The object of the present invention is to provide a machine with a collective anti-fall protection system for one or more operators working at height on the machine, a system that is quick to set up and effective.

To achieve this objective, there is provided according to the invention a mobile machine comprising a frame and a retractable system providing protection against the fall of an operator from an upper face of the frame, said system comprises security elements to be read. to form barriers at least partially defining a secure perimeter for said operator on said upper face, characterized in that at least one security element is formed by a portion of a wall or the upper face of said frame, the portion being arranged to be moved between a first, retracted position, in which it is integrated with the associated wall or the upper face of the frame and a second raised position, in which it is placed at a distance from the rest of the wall or from the upper face to form at least one security element so as to oppose the fall of an operator since the has superior face of the frame.

Preferably at least one security element is formed by a portion of a wall of said frame, said portion being configured to form an angle between the first position and the second position greater than 90 °, preferably at least 105 °.

The technical effect thus obtained is to fully house the retractable anti-fall system in the frame when said system is not in use, which represents a saving of space with respect to the use of barriers to remain folded on the face superior of the frame. The present invention has a small footprint It also provides greater accessibility of the operator to the system for its deployment in the deployed position, the security elements being integrated into the walls of the frame and therefore more accessible to an operator standing on the ground that removable barriers to be placed high on the upper face of the frame. The invention thus makes it possible to activate the safety even before the operator climbs onto the platform, thus reducing the risk of falls during the installation of the protection system.

Optionally, the machine according to the invention may furthermore have at least one of the following characteristics:

- The rear wall or front and / or at least one side wall and / or the upper face of the frame has at least one movable portion forming a security element of the retractable system and being raised vertically or inclined relative to the vertical in the second position . at least one portion is configured to form an angle of at least 165 ° between the first position and the second position.

at least one portion is configured to form an angle of at least 45 ° with the vertical in the second position.

it comprises at least two displaceable portions and securing means, said portions being arranged to be secured to one another by the securing means in their raised vertical or inclined position relative to the vertical. This has the advantage of reinforcing the secure perimeter and preventing a fall of the operator located on the upper face of the frame through a space left free between two movable portions,

- At least one portion is movable by pivoting about an axis. The pivoting has the advantage of being a movement that can easily be implemented for the displacement of a portion,

- At least one movable portion forms in its first position a hood of a wall or the upper face of the frame and, in the second raised position, releases an access opening to the interior of the frame. Thus, it is possible to combine two functions with a single element, namely a hood function in a wall or in the upper face of the frame when the portion is not in the second raised position and a function of safety element in the retractable anti-fall system when the portion is in the raised position,

- A side wall, a rear wall and the upper surface of the frame each have at least one movable portion forming a cover. This has the advantage of providing a security perimeter surrounded on three sides by a movable portion forming a security element while retaining the previously mentioned advantage of combining for a portion the hood function with that of security element,

the portions are configured to create continuity between at least two successive portions and / or between a portion and the frame so as to prevent the passage of a human body between them

the portions are configured so that two consecutive portions, when they are placed in the second position, prevent the passage of a human body between them. Thus, two consecutive portions placed in the second position form a continuity or a narrower space than the minimum dimension of a human body.

at least two portions each comprise a sliding securing bar along said portion, intended to be secured together in second position raised by a hooking means, thus forming the means for joining. Thus, the securing bar is located inside its associated portion in use of said bonnet cover which does not interfere with other elements during this use while it is easily output in use element of security of said portion to achieve a solid bonding,

- The securing bar is slidably accommodated in a reinforcing beam of said side or rear portion. This allows advantageous retraction of the bar in the portion by using a reinforcement beam already provided in said portion,

- The upper portion is shaped to cooperate with a securing bar for its joining in the raised position with the frame or an element secured to said frame. Thus, the strength of the security perimeter is reinforced and this perimeter can be completely closed after entry of the operator into its interior,

it comprises at least one flexible element (of the chain or rope type), extending between at least two portions or between the portion and the element secured to the frame, so as to be at least partially obstructed, spaces left open in the security perimeter between the movable portions and the frame or an element secured to the frame. Such a flexible element blocks against inadvertent fall of the operator by the space between two portions or between the upper portion and the frame or an element secured to the frame. Such an element can be used even when a fastening bar is provided and combined therewith,

the machine comprises a motor assembly housed in the frame of the machine,

the machine is mobile while being driven by its motor assembly,

the machine is a construction and / or work machine, said machine comprising a tool assembly driven by said motor assembly.

- The machine comprises displacement means configured to move the portions of the first position to the second position and vice versa. The displacement means are preferably operable from the ground.

The movable portions are configured to be moved automatically by moving means. The automatic movement allows easier operation from the ground without requiring operator action including height. This movement can be controlled from the ground, for example by the activation of a button, a handle, a contactor. Typically, the displacement means comprise at least one jack.

A further advantage of the present invention is obtained in the case of a construction machine comprising a tool assembly, for example a mining machine or drilling, the tool assembly having a working arm which is folded towards the upper surface of the frame when not in use, especially when moving the machine. The additional advantage is not to hinder the folding of said arm because the security elements of the retractable anti-fall system are inoperative and then integrated into the walls of the frame and / or in the upper face of said frame of the machine.

The present invention also relates to a method for securing a machine as described above comprising the steps of:

- controlling from the ground the displacement of at least a portion,

- Preferably at least a portion of a side wall and a portion of a rear wall are moved from the ground and brought into a position adapted to form a barrier preventing the fall of a body from the top of the frame.

Optional:

each portion comprises a securing bar which is slid and secured to one another from the ground so as to close at least partially a space left open between the side wall and the rear wall,

at least a portion of an upper surface of the frame is moved,

- A securing bar is secured between the upper portion and the frame or an element secured to the frame.

Thanks to the invention, the introduction of the anti-fall system is fast, it does not require the use of complementary tools. The operator or operators will not have the disadvantage of wasting time or not having the necessary tools to secure the machine.

Other features, objects and advantages of the present invention will appear on reading the detailed description which follows and with reference to the appended drawings given by way of non-limiting example and in which:

FIG. 1 is a rear view of the machine according to the present invention, the various security elements being folded down and forming portions of the walls of the frame of said machine,

FIG. 2 is a side view of the machine according to the present invention with its folded tool assembly, the rear free end portion of this tool assembly partially overhanging the upper face of the frame of the machine,

- Figure 3 is a perspective view, laterally to the machine, according to the present invention, the various security elements being raised thereby forming an anti-fall system, - Figure 4 is a front view of the machine in section AA according to Figure 3 of the rear portion of the movable portion of the left side wall and the left side of the movable portion of the rear wall of the frame of the machine according to the present invention, said portions then being in the raised position as security elements and secured together.

- Figure 5 is a sectional view, laterally to the machine, the upper movable portion of the frame in the raised position according to the present invention, this figure showing in particular the securing means between upper portion and driving cab and a flexible means obstruction of the space left open between these two elements,

In the figures that will now be described, the machine according to the present invention is shown in the form of a construction machine and / or mobile work, this construction machine is a drilling machine. This is in no way limitative and the machine according to the present invention can be a fixed machine as well as mobile and is not necessarily provided with a working tool being able for example be a means of locomotion, including a motor vehicle . In this case, it is one or portions of the body, for example engine hood, rear trunk and side elements of the body which realize the protection elements that will be defined in what follows.

The right and left directions are taken in reference to the right and left of an operator driving the machine 1, the forward direction being the one he looks at while driving, the rear direction being the opposite direction.

Figures 1 to 5 show a machine 1 comprising a frame 2 forming the main body of the machine 1. At the front of said machine 1, there is a tool assembly 3, in the figures a drilling tool. As the machine 1 is movable and has the function of a construction machine, between the frame 2 and the tool assembly 3 is disposed a driving cab 4 of said machine 1 and control of the tool assembly 3 forming the driver's compartment of said machine 1. The displacement of the machine 1 is effected by means of displacement means 9, advantageously on caterpillars with a crawler train disposed on each lateral side of the frame 2.

The frame 2 comprises two side walls 25 extending in the length of the machine 1, a rear wall 26 forming the rear part of the machine 1 and a front wall 24 adjacent to the driver's cab 4 and an upper face 27 covering said frame 2, this face 27 being substantially flat and allowing the reception and movement of an operator on it. In the non-use position of the tool assembly 3, this assembly 3 is folded towards the upper face 27 of the frame 2, extending substantially in the direction of the length of the machine 1. Thus, as shown in Figures 1 and 2, in a non-use position of the tool assembly 3, a part of the assembly 3 rests against the roof of the driver's cab 4 which is reinforced accordingly, this part of the assembly 3 being extended by a rear end portion overlooking an area of the upper face 27 of the frame 2, preferably at a distance from it. It is therefore advantageous that no element disposed on the upper face 27 of the frame 2 hinders the folding of the tool assembly 3 toward said face 27.

In the working position of the tool assembly 3, for example in drilling or mining, as illustrated in FIGS. 3 and 5, this tool assembly 3 extends substantially vertically or while being close to the vertical, in front of the machine 1.

In the embodiment illustrated by the figures of the present invention, the frame 2 houses a motor assembly 8 serving to move the machine 1 and to actuate the tool assembly 3, which is not always the case. according to the invention, the motor assembly 8 can be used only for the movement of the machine or the actuation of the tool assembly 3.

The operator of the machine 1 may have the need to access the upper face 27 of the frame 2 in order to carry out routine maintenance, for example, of the motor assembly 8 located inside the frame 2 or to its muffler 13 in the case of an exhaust leaving the upper face 27, the muffler 13 then being supported by said upper face 27, as shown in Figures 1 and 2. For one or more operators can be mounted on the upper face 27 of the frame 2, there is provided an ease of access from the ground to the upper face 27 of the frame 2, this access being made by a ladder 12, fixed by tabs on one of the side walls 25 of the frame 2, in Figure 2 on the left side wall at the front thereof.

In addition, other possibilities of access to the interior of the frame 2 can be provided from the outside of the machine 1, for example to its motor assembly 8 housed in this frame 2. Thus, it can be provided that at least a portion of one or more side walls 25, a rear wall 26 of the frame 2 or its upper face 27 is at least partially pivotable. Access through the front wall 24 of the frame 2 is also possible but is not preferred, since this access is made inaccessible due to the presence of the driving cabin 4 at the front of said wall 24.

In an embodiment according to the present invention, there are provided such displaceable portions 5, 6, 7 acting as a cover for one of the side walls 25, the rear wall 26 and the upper face 27 of the frame 2. Thus, as he is shown to the Figure 2, the movable portion 5 of one of the side walls 25, the movable portion 6 of the rear wall 26 and the movable portion 7 of the upper face 27 of the frame 2 are at least partially pivotable and serve as a cover.

By cover, it is understood a closure element of a wall 24, 25 or 26 or the upper surface 27 of the frame 2 which, in a first position, is an integral part of said wall 24, 25 or 26 or said surface upper 27 extending substantially in the plane of said wall 24, 25 or 26 or the upper surface 27. In this first position, shown in particular in Figure 2, said portion 5, 6 or 7 movable covers an opening in said side wall 25 or rear 26 or said surface 27, this opening allowing access from the outside to the inside of the frame 2. Advantageously, at least some of the movable portions 5, 6 forming a cover are meshed to allow a ventilation of the motor assembly 8.

On the other hand, the present invention is not limited to portions of walls or upper face of the frame which are movable solely by pivoting. These portions may indeed also be movable otherwise, for example by sliding up the frame with appropriate means, the various portions thus raised being secured to frame a secure perimeter on the upper face of the frame.

Thus, according to the present invention, the machine 1 is characterized in that each security element is formed by a portion 5, 6, 7 of a wall 25, 26 or of the upper face 27 of said frame 2, each portion 5, 6, 7 being movable from a first position in which it is integrated to the associated wall 25, 26 or to the upper face 27 of the frame 2 to a second raised position in which it is placed at a distance from the rest of the wall 25, 26 or the upper face 27 being preferably raised vertically or inclined relative to the vertical.

Advantageously, the raised position is configured to oppose the fall of an operator from the upper face 27 of the frame 2.

It is understood that a portion 5, 6, 7 opposes the fall of an operator from the upper face 27 when it is in a position in which the portion forms an angle less than 90 ° relative to the vertical . More precisely, the angle formed between the portion in raised position and the vertical is less than 45 °, more preferably less than 20 °. Even more preferably, the angle is between plus and minus 5 ° with respect to the vertical.

The angle may be formed outwardly of the frame or inward, i.e. the portion extends beyond the frame or above the frame. The raised position of a portion means when it is above the horizontal. More generally, the raised position of a portion means when it is arranged above the plane of the upper face 27 of the frame.

In the second position corresponding to the raised position of said cover in the embodiment shown in FIG. 3, the displaceable portion 5, 6 or 7 is pivoted and releases access to said opening and inside the frame 2. such portions 5, 6 or 7 movable respectively for a side wall 25, rear 26 and upper face 27 are advantageously provided with a latch for securing them with the frame 2 in their integrated position to their wall 25, 26 or upper face 27 associated.

In FIGS. 3 and 4, it is the left side wall of the machine 1 which is shown with a displaceable portion 5 which can serve as a safety element, but this could also be the case for the right side wall of the machine 1. In the latter case, not shown in the figures, the movable portion of the upper face of the frame would accordingly have its hinge axis disposed near the left side edge of the upper face of the frame.

In another alternative, not illustrated in the figures, it is possible to provide a lateral portion displaceable on each lateral side of the machine, the upper face of the frame then not having a displaceable portion or the displaceable portion thereof being not used as a safety element of the retractable fall arrest system in the machine according to the present invention.

Referring again to FIG. 3, the sidewall 25 having a displaceable lateral portion 5 may be one that does not carry the ladder 12, or alternatively the ladder 12 is placed on said sidewall 25 in a position not impeding the pivoting of the movable lateral portion 5. This pivoting is of greater amplitude for said portion officiating as a security element than that sufficient to have access only inside the frame 2, as will be seen later.

The pivot axis of the displaceable portion 5 of the side wall 25 extends along the length of the machine 1 close to the upper side of said side wall 25. The pivot axis of the movable portion 6 of the rear wall 26 extends in the direction of the width of the machine 1 near the upper side of said rear wall 26. The pivot axis of the movable portion 7 of the upper face 27 extends in the direction of the length of the machine 1 near a right or left side of said upper face 27, that is to say the side opposite to the side wall 25 which comprises a n portion 5 movable. In FIG. 3, this pivot axis extends on the right side of said upper face 27. As can be seen in particular in FIG. 3, such displaceable portions 5, 6 and 7 have the first advantage of allowing access from the outside to the inside of the frame 2 and thus to the motor assembly 8, this being known of the state of the art. By cons, instead of pivoting the portions 5, 6 and 7 movable just enough to clear access to the interior of the frame 2, there is provided, according to the embodiment of the present invention shown in the figures, to pivot greater amplitude of said portions 5, 6 and 7 about their respective pivot axis.

This allows a raising towards the top of the machine 1 of these portions 5, 6 and 7 movable, forming a secure perimeter 19, visible in Figure 3, above the upper face 27 of the frame 2 of the machine 1 . This perimeter 19 is delimited at least partially by these portions 5, 6 and 7 forming safety elements in the form of barriers of a retractable anti-fall system, thus preventing the fall of an operator standing in said secure perimeter 19.

According to the invention, the portions 5, 6, 7 forming security elements are configured to create continuity between at least two successive portions and / or between a portion and the frame. The continuity between the security elements can be performed with joining means described below or may be performed by the only portions whose position in the ^2nd position is such that any gap therebetween is narrower than the minimum dimension of a human body. The portions 5, 6, 7 and / or the securing means are preferably arranged so that any passage between them is sufficiently narrow to prevent the passage of a human body, specifically an adult.

In a simple use as a side or rear cover, the lateral 5 and rear 6 displaceable portions do not rotate and open less than 90 °, generally less than 73 °. In order to enable them, according to the present invention, a second function as a security element of a retractable anti-fall system, the respective articulation of the portions 5 and 6 is modified in order to allow these portions 5 and 6 to be opened after a pivoting up to 165 ° or even 180 ° with respect to their respective pivoting axis.

Preferably, the pivoting portions 5 and 6 is at least 90 ° and preferably greater than 90 ° and at least 105 °.

These pivot angles are between the first position of the portion integrated in the wall, and the raised position. Advantageously, the angle formed between the position of the portion 5, 6 between the first and the second position is at least 130 °. Preferably it is at least 165 ° when the first position is substantially vertical.

With regard to the displaceable portion 7 of the upper face 27 of the frame 2, its pivoting may advantageously be between 45 and 80 °, advantageously about 55 °, in order to avoid any risk of the operator falling for higher angles. at 80 °.

Thus, the present invention can use an opening element 5, 6 or 7 already existing on the frame 2 and dedicated to a first function, that is to say a hood function, to perform a second function, that is to say a security element function forming part of a retractable system. The opening of a portion 5, 6 or 7 movable can be manual or automatic. Preferably, the opening of the portion 5 or 6 respectively forming the side or rear cover of the side wall 25 or rear 26 is from the ground advantageously automatically.

This placement from the ground ensures activation of a security element even before the operator reaches the top of the vehicle, which provides greater security than a system of removable barriers, for which it is the operator when he is already in height which deploys the safety elements forming barriers with risk of falling of the operator during the handling of said elements, these elements being not yet in effective position to ensure the safety of the operator standing on the upper face of the frame.

Regarding the upper face 27 of the frame 2, the opening of the movable upper portion 7 can be performed manually when the operator is on said face 27. Indeed, because the upper portion 27 opens towards the outside, it constitutes from the beginning of its opening a protection for the operator and the risks of accidental falls of the operator are then reduced if not impossible.

The invention comprises displacement means for passing the portion or portions 5, 6, 7 from the first position to the second position. These displacement means are, for example, cylinders 21.

As can be seen in particular in FIG. 3, there is provided a jack 21 for pivoting the displaceable lateral portion 5 and a jack 21 for pivoting the movable rear portion 6. The movable upper portion is pivoted by two jacks 21, FIG. 4.

Figure 3 shows a displaceable portion 5 of a side wall 25 of the frame 2, in the figure the left side wall, said portion 5 being in the raised position and acting as a safety element of the retractable anti-fall system. Like before mentioned, this displaceable portion 5 is advantageously screened and comprises a reinforcing upper spar 15 at its free edge, said edge extending in the length of the frame 2 and being the upper edge of the portion 5 when it is pivoted in its position d security element. This displaceable portion advantageously also comprises a median reinforcing spar extending parallel to the upper spar 15 of reinforcement.

The two jacks 21 of the side wall 25 are respectively active on a front or rear side of the displaceable lateral portion 5. Each jack 21 of this side wall 25 is supported at a first end, in FIG. 4 that forming the free end of the jack rod 21, on a fixed zone of the frame 2 and at a second end forming the end. of the cylinder body 21, on the median reinforcing spar. Through these two jacks 21, the displaceable lateral portion 5 is pivoted relative to the frame 2 about its pivot axis extending along the length of the frame 2.

With the present invention, it is not necessary to add new elements to the machine. The portions 5, 6, 7 are an integral part of the frame. Similarly, the means for moving the portions 5, 6, 7 are preferably the conventional means for moving the portions in their simple use as a hood. It is only necessary to provide different cylinder lengths and forces. This arrangement also allows production at costs equivalent to conventional machines. The presence of an anti-fall device does not increase the cost price of the machine.

According to the invention, the machine comprises securing means. The securing means extend between the portions 5, 6 and / or 7 and / or between the portions and the frame.

The upper reinforcing spar 15 receives in its interior a securing bar 10 of the lateral portion 5 movable to secure said lateral portion 5 with the rear portion 6 movable. This securing bar 10 is slidable inside the upper reinforcement spar 15 and projecting from its end facing the rear of the frame 2, in cooperation with a securing bar of the movable rear portion 6, to secure the lateral portion 5 movable with the rear portion 6 movable.

The upper reinforcement spar 15 also comprises, at mid-length, a lock that secures it to the frame 2 in the closed position of the displaceable lateral portion 5, this lateral portion 5 then acting as a cover for the side wall 25 of the frame 2 enclosing the motor assembly 8. As can be seen in particular in Figures 4 and 5, there may exist between the portions 5, 6 and 7 movable spaces left open 22 and 23 should be secured so that an operator can not fall through this space 22 or 23, these spaces 22 or 23 being shown surrounded in said figures.

FIG. 4 shows a rear end zone of the lateral portion 5 that is displaceable and thus close to the movable rear portion 6 of the frame 2. In this figure, the lateral and rear portions 5 and 6 are raised and provide their elemental function. safety after pivoting about their axis passing through hinges. However, there remains a gap left open between the lateral portion 5 and the rear portion 6 that should be secured.

With reference to FIG. 4, in this raised position of the displaceable lateral portion 5, the manipulation of the jack 21 can be made difficult, especially when it is a question of releasing the lateral portion 5 that can be moved from its raised position in order to lower it. in the hood position of the engine assembly. In order to perform this manipulation, there is provided an unlocking bar for the rear lateral cylinder 21 of the lateral portion 5 movable but which can also be used for the front cylinder not shown in this figure.

Still with reference to FIG. 4, it is visible that the jack 21 reaches a position close to its limit stop in the raised position of the displaceable lateral portion 5. It may be wise to stiffen this position by the addition of a mechanical stop or indexing ensuring the raised position of the lateral portion 5 without risk of even partial closure of this portion 5. It may also be advisable to to add to the cylinder 21 crutches or locking elements as studs for holding it in position.

FIG. 5 shows the open space 22 between the front edge of the displaceable portion 7 of the upper face 27 of the frame and the operator's cab 4 of the machine 1, the driver's cab 4 being able to be considered as an element secured to the frame . When the operator goes up the ladder, he can grab a bar 14, one end of which is fixed to the driver's cab 4 with pivoting freedom around it. Then, it secures the other end of the bar 14 to the front edge of the upper wall 7 movable with respect to the driver's cab 4 by a quick coupling means, for example a pin at the end of the bar 14 received in a corresponding hollow element provided on the front edge of the upper wall 7. The opposite is also possible with a bar whose one end is fixed to the movable portion 7, its other free end being fixed by the operator to the driving cabin 4.

This protection can be advantageously completed by the introduction of a flexible element serving to partially obstruct the passage through the space 22, for example a chain or rope 18, below said bar 14 connecting the movable upper portion 7 and the driving cabin 4. During closure, the free end of the chain or rope 18 can be secured, according to the configuration , with the portion 7 or the driver's cab 4 by a snap-hook type attachment means and complementary element.

As shown in FIG. 4, with regard to the open space 23 between the rear edge of the displaceable portion 5 of the side wall 25 and the left edge of the movable portion 6 of the rear wall 26, its obstruction can be made from the soil by the operator, manually or with the aid of a control bar, this with the securing means of these two portions 5 and 6. To do this, the operator takes out of his associated spar 15 the bar for securing the displaceable lateral portion 5 as well as the securing bar 11 of the movable rear portion 6 of its associated spar 16. A means for securing the securing bars 10 and 11 is provided, this means advantageously being an attachment fast easily removable, for example type carabiner or pin with corresponding complementary part. The bar 10 of the lateral portion 5 and the bar 1 1 of the rear portion 6 are thus fixed to one another and also prevent the passage through the space 23 of an operator standing on the frame. This can be done by the operator from the ground 17.

Instead of using the upper spar 15 or 16 reinforcement to accommodate the corresponding tie bar 10 or 1 1, it can also be used the median reinforcing spar when the side portions 5 and rear 6 each have one.

In general, with regard to the displacement of a movable lateral, rear or upper portion, in order to assist this movement, additional elements may be provided such as strap winder and corresponding strap to perform a traction on said portion, these additional elements not being shown in the figures.

For the sake of argument, the retractable protection system according to the invention may have a raised height greater than one meter in the raised position and be designed to resist the fall of a body. Its setup time is less than two minutes and this implementation can be performed by a single operator.

The invention finds particularly advantageous application machines for moving, typically motorized or movable vehicles, typically mobile machines driven in motion by a vehicle. Advantageously, the machine object of the present invention is a craft of quarry work, a construction machine, a public works machine.

The invention is not limited to the embodiments described above but extends to any embodiment within its spirit.

REFERENCES

1. machine

2. built

3. tool set

4. driving cabin

5. movable portion of the side wall of the frame

6. movable portion of the back wall of the frame

7. movable portion of the upper face of the frame

8. motor assembly

9. means of moving the machine

10. securing bar of the displaceable lateral portion

1 1. locking bar of the movable rear portion

12. access ladder to the upper face of the building

13. exhaust pipe of the engine assembly

14. bar for securing the movable portion of the upper face of the frame with the driver's cab

15. upper beam for reinforcing the movable lateral portion

16. reinforcement beam of movable rear portion

17. ground

18. string or rope

19. secure perimeter

20. Operator

21. cylinder for pivoting a movable portion

22. space left open between the front edge of the upper portion and the driver's cab

23. space left open between the rear edge of the side portion and the rear portion

24. front wall of the building

25. side wall of the building

26. rear wall of the building

27. upper face of the frame

Claims

1. Mobile machine (1) comprising a frame (2) and a retractable system providing protection against the fall of an operator from an upper face (27) of the frame (2), said system comprises safety elements (5, 6, 7) intended to be raised in order to form barriers at least partially delimiting a secure perimeter (19) for said operator on said upper face (27), characterized in that at least one security element is formed by a portion (5). , 6, 7) of a wall (25, 26) or of the upper face (27) of said frame (2), the portion (5, 6, 7) being arranged to be moved between a first position in which it is integrated into the associated wall (25, 26) or to the upper face (27) of the frame (2) and a second position in which it is placed at a distance from the remainder of the wall (25, 26) or from the upper face ( 27) to form at least one security element so as to oppose the fall of a operator from the upper face (27) of the frame (2) and that at least one security element is formed by a portion (5, 6) of a wall (25, 26) of said frame (2), said portion (2) 5, 6) being configured to form an angle between the first position and the second position greater than 90 °, preferably at least 105 °.

2. Machine (1) according to claim 1, characterized in that it comprises at least one rear wall (26) and / or front (24) and / or at least one side wall (25) and / or an upper face (27) of the frame (2) having at least one portion (5, 6, 7) movable forming a security element of the retractable system, and being raised vertically or inclined relative to the vertical in a second position.

3. Machine according to any one of the two preceding claims wherein at least one portion (5, 6) is configured to form an angle of at least 165 ° between the first position and the second position.

4. Machine according to any one of the three preceding claims wherein at least one portion (7) is configured to form an angle of at least 45 ° with the vertical in the second position.

5. Machine (1) according to any one of the preceding claims, characterized in that it comprises at least two portions (5, 6, 7) displaceable and securing means, said portions being arranged to be secured one with the other by the securing means (10, 1 1, 23) in their second position.

6. Machine (1) according to any one of the preceding claims, characterized in that at least one portion (5, 6, 7) is movable by pivoting about an axis.

7. Machine (1) according to any one of the preceding claims, characterized in that at least one portion (5, 6, 7) displaceable forms in its first position a hood of a wall (25, 26) or of the upper face (27) of the frame (2) and, in second position, releases an access opening inside the frame (2).

8. Machine (1) according to the preceding claim, characterized in that a side wall (25), a rear wall (26) and the upper surface (27) of the frame (2) each have at least one portion (5, 6, 7) movable forming the hood.

9. Machine (1) according to the preceding claim wherein the portions (5, 6, 7) are configured to create continuity between at least two successive portions and / or between a portion and the frame (2) so as to prevent the passage of a human body between them.

10. Machine (1) according to any one of the preceding claims, characterized in that the portions (5, 6, 7) are configured so that two consecutive portions (5, 6, 7), when placed in the second position, prevent the passage of a human body between them.

1 1. Machine (1) according to claims 5 and 8 or 9, characterized in that it comprises a hooking means and at least two portions (5, 6, 7) which each comprise a securing bar (10, 1 1) sliding along said portion (5, 6, 7) and intended to be secured together in second position by the attachment means thereby forming the securing means.

12. Machine (1) according to the preceding claim, characterized in that the portion (5 or 6) comprises a reinforcing spar (15 or 16) in which is slidably housed a securing bar (10 or 1 1).

13. Machine (1) according to any one of claims 8 to 12, characterized in that the upper portion (7) is shaped to cooperate with a securing bar (14) for securing it in second position with the frame (2). ) or an element (4) secured to said frame (2).

14. Machine (1) according to any one of claims 8 to 13, characterized in that it comprises at least one flexible element (18) extending between at least two portions (5, 6) or between a portion ( 7) and the element (4) secured to the frame (2) so as to at least partially obstruct, open spaces (22, 23) in the safety perimeter (19) between at least two portions (5, 6, 7) movable and the frame (2) or an element (4) secured to the frame (2).

15. Machine (1) according to any one of the preceding claims, characterized in that it comprises a motor assembly (8) housed in the frame (2) of the machine (1).

16. Machine (1) according to the preceding claim, characterized in that it is movable while being driven by its motor assembly (8).

17. Machine (1) according to the preceding claim, characterized in that it is a construction machine and / or work, said machine (1) having a tool assembly (3) driven by said motor assembly (8).

Machine (1) according to any one of the preceding claims, comprising displacement means configured to move the portions (5, 6,

7) from the first position to the second position and vice versa.

19. Machine (1) according to the preceding claim wherein the displacement means are configured to be controlled from the ground (17).

20. A method of securing a machine (1) according to any one of the preceding claims comprising the step of:

- Move at least a portion (5, 6, 7) movable from the ground (17).

21. Method according to the preceding claim wherein at least a portion (5) of a side wall (25) and a portion (6) of a rear wall (26) are moved from the ground (17), each portion (5, 6) comprises a securing bar (10, 1 1) which is adapted to be slid from the ground (17) so as to be fixed to the other bar to close at least partially a space left open between the side wall (25) and the rear wall (26).

22. Method according to the preceding claim wherein:

at least a portion (7) of an upper surface (27) is displaced,

- A securing bar (14) is secured between the upper portion (7) and the frame (2) or an element (4) secured to the frame (2).