Holding means for retaining a stabiliser profile of a height access device in the storage position

Abstract

The invention relates to holding means (50) for retaining a profile, in particular a stabiliser profile, of a height access device in the storage position, the holding means (50) comprising a placement space for the profile and a movable jaw (51, 52) movable between an open position and a closed position of this placement space, wherein a return means exerts a force on the movable jaw (51, 52) so as to keep the movable jaw in the open position, wherein the return means comprises a bearing region for the profile, such that a pressure applied by the profile on the bearing region causes the movable jaw (51, 52) to move from its open position to its closed position, thereby retaining the profile in the placement space.

Description

[0001] Means for holding a stabilizer profile of a working at height device in the storage position

[0002] The invention relates to height access devices, in particular of the platform type.

[0003] By "platform" we mean in particular mobile ladders with a platform, and more precisely mobile ladders with a working platform with a maximum surface area of ​​1 m 2 and with a maximum height of 5 m, designed to be used by one person at a time. Such platforms are presented in the NF EN 131 - 7 standard.

[0004] The invention relates in particular to individual rolling platforms (PI R) or individual light rolling platforms (PI RL).

[0005] A rolling individual platform is conventionally a secure workstation compliant with standard NF P 93-352. A rolling individual platform is then a platform used for work at height, which can be carried and / or handled by crane in construction work by a single operator, working on a floor at a maximum height of 2.5 m above the ground. PIRs have a means of movement, a means of immobilization and a means of access to the workstation. Portable PI Rs have a mass of less than 50 kg and can be folded without separating their elements. PI Rs are equipped with two wheels to allow them to be handled in the closed position. PIRs have a floor protected on three sides by means of protection against falls from a height. These means of protection against falls include a plinth, extending on three sides of the floor.When the user is at the workstation, the fall protection means include a rail extending approximately to the height of the user's pelvis, and a sub-rail extending to the height of the user's legs. A mobile closure for access to the workstation is provided. The presence of the operator on the platform must not be an obstacle to closing access to the workstation. When the workstation opens outwards, standard NF P 93-352 stipulates that a locking system for the mobile closure is mandatory.

[0006] Document FR2914683 (DUARI B) shows an example of a PI R. A lightweight rolling individual platform is conventionally a secure workstation that complies with standard NF P 93-353. A lightweight rolling individual platform is then a platform used for work at height, which can be carried and / or handled by crane in construction work by a single operator, working on a floor at a maximum height of 1.5 m above the ground. PI RLs have a means of movement, a means of immobilization and a means of access to the workstation. PI RLs have a mass of less than 50 kg and can be folded without separating their elements. PI RLs are equipped with wheels to allow them to be handled in the closed position. PI RLs have a floor protected on three sides by means of protection against falls from a height.These fall protection devices include a toeboard extending along three sides of the floor. When the user is at the workstation, the fall protection devices include a rail extending approximately to the height of the user's pelvis, and a sub-rail extending to the height of the user's legs. A mobile closure for access to the workstation is provided. The presence of the operator on the platform must not be an obstacle to closing access to the workstation. When the workstation opens outwards, standard NF P 93-353 stipulates that a locking system for the mobile closure is mandatory.

[0007] Document FR3023571 (CDH) shows an example of PI RL.

[0008] The invention also finds use in the field of working at height devices, in particular stepladders according to standard NF EN 14183, portable ladders according to standard NF EN 131 EN, rolling scaffolding within the meaning of standards NF EN 1 004 and NFP 93-520. Working at height equipment meets strict safety standards, in order to ensure the safety of users, and in particular to limit the risk of falling.

[0009] In France, for the year 2021, according to the Health Insurance, 23% of work accidents were linked to a fall from height, and this proportion was 45% for the construction industry. In 2016, falls from height were the cause of 1.6% of permanent disabilities and 1.6% of deaths linked to work accidents in France, all sectors combined (see 2016 Management Report of the Health Insurance Occupational Risks, part 5 - Claims all CTN, table 2, P. 1 2). Such falls can result from a tipping over of the working device at height, in particular for rolling platforms or ladders.

[0010] In order to avoid the occurrence of such an accident, the applicable regulations relating to working at height, in particular articles R. 4323-81 to R. 4323-88 of the labor code, subject working at height devices to a certain number of requirements, and in particular the fact of being stable in use.

[0011] To achieve such a result, it is known to equip the working at height device with stabilizers.

[0012] Stabilizers generally have one end hinged to a piece of working equipment at height, so as to facilitate their transport and deployment.

[0013] When moving the work equipment, the stabilizer is generally held in the retracted position, by means of devices provided for this purpose.

[0014] The invention relates more particularly to means for maintaining stabilizers in the retracted position.

[0015] In order to increase the stability of the platforms, various stabilizers have been proposed, but most often no means are provided to ensure that the stabilizers are held in the storage position.

[0016] In some implementations, stabilizers are articulated in the lower part of the platform's lifting plane. For example, we can refer to document FR31 02791 (AUDINNOV) which describes two stabilizer feet mounted to pivot through 180°, between a folded position against the lifting plane and a deployed position supporting the ground.

[0017] In other implementations, stabilizers are articulated on the support base of the platform. Reference may be made, for example, to documents EP 1 921 249 (ZARGES), EP2034128 (TUBESCA), FR301 2841 (TUBESCA), W0201 9170141 (SCG).

[0018] In other implementations, stabilizers are articulated to the lifting plane and the support base of the platform. Reference can be made, for example, to documents DE202007000406 (HYM ER), DE1 02013005324 (HYMER).

[0019] In the field of ladders, various means have been proposed, in the state of the art, for maintaining stabilizers in the storage position. According to a first, very old design, a wire tie or a strap are used. Reference can be made, for example, to documents US485900 (TANNENBERG), AU20141 00453 (KEMTHORNE). The installation and removal of these ties or straps is laborious and not ergonomic.

[0020] According to a second design, also very old, the stabilizers are placed in the storage position in housings formed by U-shaped parts fixed to the side members of the ladder. We can refer for example to documents US1910551 (KRUSE), FR1244540 (ZIM BACCA), FR2554501 (VARDANEGA), (DE8700350 (M EI ER). Such a design has many disadvantages. No means are provided to keep the stabilizers in the storage position. When transporting the ladder, there is thus a risk of unexpected movement of the stabilizers, coming out of their storage position, with the resulting damage in the event of impact with a person, in particular the user of the ladder, or possible damage in the event of impact with an object. Furthermore, placing the stabilizers in the storage position requires dexterity.

[0021] According to a third design, old and constantly used for decades, the stabilizers are held in the storage position by elastic clips. Reference may be made, for example, to documents GB189820934 (FLOOD), US1526654 (AMOS), US2381 154 (FOWLER), DE1 643377 (GOTTSCHALK), US29971 27 (WOJTOWICZ), FR1467900 (RIVOAL), US3508628 (CONRAD), US3568798 (PI ERCE), GB1368001 (HENDERSON), US3901354 (GREBAUSKY), AU493550 (HALKERSTON), GB21 80875 (YOUNG), DE3639698 (STRU EWER) US4872529 (VI ETS), US4949809 (AC), US551 1 632 (ERM IS), GB231 6705 (SAXON), US20020741 87 (BENDLE), FR2947849 (CENTAUR), CA2887237 (TRAN), KR1 02228480 (KT SERVICE), EP3524770 (CENTAUR).

[0022] Clip-on attachment using clips or elastic blades is not without its drawbacks. Fitting the stabilizer profile into the clip requires dexterity, and unsuccessful attempts to store the stabilizers can discourage users. To facilitate the installation and removal of the stabilizer, the user may be tempted to place their hand around the stabilizer profile, at the height of the clip, but this is detrimental to ergonomics, as the clips are most often placed at the lower part of the ladder.

[0023] Other designs for storing stabilizers have sometimes been proposed, without providing a satisfactory solution. Reference may be made, for example, to document AU20082431 94 (DAN HA). Document US6533071 (SM ITH) describes a ladder stabilizer, the stabilizer comprising a U-shaped part whose arms come from each side of the foot of the ladder, the fixing of the stabilizer being ensured by tightening a nut on an axis connecting the two arms of the U-shaped part. Such a design makes the fixing of the stabilizers even more laborious, with, in addition, risks of losing the fixing means.

[0024] The invention aims to provide means for holding stabilizers in the storage position, these means not having the drawbacks which have just been presented.

[0025] An object of the invention is to provide such holding means, which are ergonomic and simple and intuitive to use.

[0026] Another object of the invention is to provide such holding means, which can be installed on the greatest number of existing height access devices, in particular of the platform type.

[0027] For these purposes, there is proposed, according to a first aspect, a means for holding in the storage position a profile of a working device at height, in particular a stabilizer profile, the holding means comprising a placement space for the profile, and a jaw movable between an open position and a closed position of this placement space, a return means exerting a force on the movable jaw by holding the movable jaw in the open position, the return means comprising a support zone for the profile, so that a pressure action applied by the profile on the support zone drives the movable jaw from its open position to its closed position, the profile then being held in the placement space.

[0028] Advantageously, the holding means comprises two jaws, each of the two jaws being movable between an open and closed position, the return means exerting a simultaneous force on each of the two jaws by holding them in their open position, a pressure action applied by the profile on the support zone driving the two jaws from their open position to their closed position, the profile then being held in the placement space. In certain implementations, each of the two jaws comprises a first rigid part and a second flexible part, the two flexible parts of the two jaws forming the support zone for the profile.

[0029] Advantageously, the holding means comprises a frame on which the two jaws are mounted to pivot around substantially parallel axes, the two flexible parts being mounted articulated around an axis substantially parallel to the pivot axes of the two jaws.

[0030] It is thus possible to mount the support means on an existing working at height device, for example a platform, by fixing the chassis on a side member, for example.

[0031] Advantageously, the distance D between the two pivot axes of the jaws relative to the chassis is less than the sum of two inter-axis distances D1 + D2, namely on the one hand the distance D1 between the articulation axis of the two flexible parts and the pivot axis of a first jaw and on the other hand the distance D2 between the articulation axis of the two flexible parts and the pivot axis of the second jaw.

[0032] Advantageously, each of the two jaws has a concave internal surface, facing towards the inside of the placement space for the profile when the jaw is in the closed position, each of the two internal surfaces being complementary to a part of the external surface of the profile.

[0033] According to a second aspect, there is provided an assembly comprising a stabilizer and a holding means as above, the stabilizer comprising a first tube, a second tube, and a system for blocking the sliding of the first tube inside the second tube.

[0034] In some implementations, the stabilizer comprises a connecting rod. Advantageously, each of the two jaws comprises a concave internal surface, facing towards the inside of the placement space when the jaw is in the closed position, the concave internal surface of a first jaw being complementary to the external surface of the second tube, the concave internal surface of the second jaw being complementary to the external surface of the connecting rod.

[0035] According to a third aspect, a working at height device is proposed incorporating an assembly such as above, the working at height device being in particular a PIR individual rolling platform or a PI RL light individual rolling platform. Other objects and advantages of the invention will appear in the light of the description of embodiments, given below with reference to the appended drawings in which: Figure 1 is a perspective view of a platform, according to one embodiment; Figure 2 is a side view of the platform shown in Figure 1; Figure 3 is a detail view of a part of the platform shown in Figures 1 and 2, the holding means forming a clamp being shown in the open position and in the closed position; Figure 4 is a top view of holding means forming a clamp, according to one embodiment, the clamp being in the open position;Figure 5 is a view similar to Figure 4, the clamp being in the closed position; Figure 6 is a perspective view of a platform of the type shown in Figure 1, a stabilizer being in the deployed position for support on the ground, the clamp-forming holding means being in the open position; Figure 7 is a view similar to Figure 6, the clamp-forming holding means being in the closed position, the stabilizer being in the folded storage position.;

[0036] In the remainder of this description, the terms “horizontal” and “vertical” are used in reference to the platform in the deployed position, resting on the ground, as shown in figures 1 and 2.

[0037] We first refer to figures 1 and 2, which represent a platform 1, according to one embodiment, the platform 1 being represented in side view and in perspective.

[0038] Platform 1 includes two legs.

[0039] In the embodiment shown, the platform has easy access, a first base 2 forming a climbing surface, the second base 3 forming a crutch.

[0040] In other embodiments, not shown, the platform has dual access, and comprises two legs each forming a climbing plane.

[0041] In the embodiment shown in Figures 1 and 2, the climbing plane comprises two side members 4, 5 and rungs forming steps 6, 7. The steps 6, 7 advantageously comprise a non-slip support surface, this surface being for example embossed, ribbed, perforated. According to various embodiments, the steps 6, 7 comprise an element in the form of a grid, a grating, expanded metal or perforated metal. The steps 6, 7 may be made of metal, in particular aluminum alloy or steel, or composite material.

[0042] In the embodiment shown, the second base 3 comprises two side members 8, 9 and crosspieces 10. The crosspieces 10 are in the form of substantially horizontal bars.

[0043] In some implementations, the platform has, for example, five to seven steps, the maximum working height then being around three to four meters.

[0044] In some embodiments, the second base comprises a lower crosspiece in the form of a bent or curved tube, forming a U-shaped opening towards the ground. This arrangement allows the platform to be used above an obstacle such as, for example, a toilet bowl. In some embodiments, the climbing plane is of fixed height and comprises two steps 6, 7. Alternatively, the climbing plane may comprise a single step, or more than two steps.

[0045] In the embodiment shown in figures 1 and 2, the lifting plane 2 is of adjustable height, and comprises two telescopic assemblies, the second base 3 also being of adjustable height and comprising two telescopic assemblies.

[0046] The implementation of an adjustable height rise plan is known in itself, and described for example in document FR2914683 (DUARI B).

[0047] A mobile assembly comprising side members 11, 12 and rungs forming steps is slidably mounted on the first base 2. A mobile assembly comprising side members 13, 14 and rungs forming crosspieces is slidably mounted on the second base 3. Advantageously, locking means block the sliding of the mobile side members 11, 12 relative to the fixed side members 4, 5 of the first base 2, locking means blocking the sliding of the mobile side members 13, 14 relative to the fixed side members 8, 9 of the second base 3. Means for operating the locking means allow, for example, the release or engagement of a finger carried by a fixed side member, in a housing of a mobile side member.

[0048] When the ascent plan has a large number of steps, the platform preferably includes stabilizers, on the ascent plan and / or on the second base.

[0049] In the embodiment shown, the platform comprises two stabilizers 30, 31, each of these stabilizers 30, 31 being mounted articulated to a side member 8, 9 of the second base 3. The stabilizers 30, 31 can be deployed laterally, on each side of the workstation.

[0050] In other embodiments, not shown, the platform further comprises or alternatively comprises at least one stabilizer articulated to the ascent plane.

[0051] As will appear in more detail in the remainder of this description, each stabilizer 30, 31 is mounted to move between a deployed position for support on the ground and a folded storage position. In the deployed position, the stabilizers increase the surface area of ​​the support polygon of the platform.

[0052] In the folded storage position, the stabilizers extend substantially parallel to the side members 8, 9.

[0053] Safe use of the platform is also ensured by anti-slip means.

[0054] Each of the two side members 11, 12 of the ascent plane 2 carries a non-slip pad 15, 16. This pad 15, 16 is for example made of elastomer. The fixing of the pad 15, 16 on its support side member 11, 12 is for example obtained by force fitting.

[0055] Each of the two side members 13, 14 of the second base 3 forming a stand carries a non-slip pad 17, 18. This pad 17, 18 is for example made of elastomer. The fixing of the pad 17, 18 on its support side member 13, 14 is for example obtained by force fitting.

[0056] When a user steps onto the platform 1 in the deployed position, as shown in Figures 1 and 2, the platform 1 rests on the ground on its four non-slip pads 1 5-1 8.

[0057] In the embodiment shown in Figures 1 and 2, each of the two side members 13, 14 of the second base 3 carries a wheel 19, 20. When a user wishes to move the platform 1, in the deployed position, the climbing plane 2 is inclined relative to the vertical, so that the wheels 19, 20 come into contact with the ground. It is thus possible to move the platform 1 manually and effortlessly, like a wheelbarrow.

[0058] The wheels 1 9, 20 also allow the platform to be moved, in the compact folded transport position.

[0059] When a user climbs the ascent plane or is on the platform, the wheels 1 9, 20 advantageously do not touch the ground.

[0060] In the embodiment shown, the travel wheels are neither steerable nor load-bearing in the working position of the platform.

[0061] In certain implementations, the stand 3 advantageously carries a device for locking the side members of the ascent plane, when the platform 1 is in the compact folded position. The locking devices comprise, for example, two deformable tabs forming an elastic hook. When the platform 1 is folded, the stand 3 is pivoted relative to the ascent plane 2, and the side members 4, 5 of the ascent plane 2 move closer to those of the stand 3, opening the elastic hooks. The locking of the side members 4, 5 of the ascent plane 2 is obtained by snap-fastening.

[0062] Platform 1 includes a horizontal floor 21.

[0063] This floor 21 is advantageously non-slip and is, for example, with an embossed, ribbed, or perforated surface.

[0064] The floor 21 may be made of metal, in particular aluminum alloy or steel, or of composite material, for example with a polymer matrix and fiberglass reinforcement.

[0065] A plinth 22 delimits the floor 21, this plinth 22 comprising three sections substantially perpendicular to the floor 21, namely two lateral sections and a junction section, opposite the rising plane.

[0066] This baseboard reduces the risk of objects, such as tools, falling onto the floor. This baseboard acts as a stop for the user's feet, reducing the risk of falls.

[0067] The height of the plinth is advantageously ten centimeters or more than ten centimeters.

[0068] In one implementation, the floor and the plinth are made of one material, for example, by injection molding. In other implementations, the plinth is fixed to the floor. In some specific embodiments, the plinth is hinged to the floor between a deployed position for use and a compact folded position for storage or transport of the platform.

[0069] The floor width is advantageously forty centimeters, and its length less than one meter. The platform is therefore suitable for interior work, and can be moved into openings such as doors, or in building staircases.

[0070] Platform 1 includes a guardrail.

[0071] In the embodiment shown, the guardrail is formed from bent or curved tubes.

[0072] Advantageously, the tubes forming the guardrail are similar to those forming the two bases 2, 3.

[0073] The tubes forming the guardrail and the bases can be made of aluminum alloy or steel.

[0074] When the platform 1 is intended for electrical work, the tubes forming the guardrail and the bases are advantageously made of insulating material, such as a composite material, for example with a polymer matrix and glass fiber or flax fiber.

[0075] The guardrail comprises a lower rail 23 and an upper rail 24.

[0076] The rails 23, 24 are articulated between a deployed position of the platform, shown in figures 1 and 2, and a compact folded position for storing the platform.

[0077] In the deployed position of use of the platform as shown in figures 1 and 2, the lower and upper rails 23, 24 are substantially horizontal.

[0078] The lower rail 23 carries a lower shelf 25. In certain implementations, this lower shelf 25 is made of polymer material or composite material. The functions of the lower shelf 25 are adaptable to the desired uses for the platform 1, the shelf being able to serve as a tool holder, and / or as a support for a flexible or rigid tool box, and / or as a support for a container, for example a paint pot. Depending in particular on the loads in service, the fixing of the lower shelf 25 on the rail 23 can be carried out by force mounting, or by screwing or riveting. The upper rail 24 carries an upper shelf 26. In certain implementations, this upper shelf 26 is made of polymer material or composite material. The functions of the upper shelf 26 are adaptable to the desired uses for the platform 1, the shelf 26 being able to serve as a tool holder, and / or as a support for a flexible or rigid tool box.Depending in particular on the loads in service, the fixing of the upper shelf 26 on the upper rail 24 can be carried out by force mounting, or by screwing or riveting.

[0079] The two side members 4, 5 of the ascent plane 2 delimit a circulation space for the user's body, during his ascent and descent from the platform 1.

[0080] A working space is delimited laterally by the upper sections of the side members 4, 5 of the climbing plane, and the upper sections of the side members 8, 9 of the rear stand.

[0081] This workspace is secure, particularly with regard to the risk of falling, at different heights of the user's body.

[0082] A first safety feature, at the height of the user's feet, is provided by the three sections of the plinth 22.

[0083] A second safety feature, at the height of the user's legs, is provided by the lower rail 23 of the guardrail.

[0084] A third safety feature, at the height of the user's pelvis, is provided by the upper rail 24 of the guardrail.

[0085] The lower 23 and upper 24 rails of the guardrail provide safety to the user against a lateral fall or a forward fall, i.e. approximately 270°.

[0086] Complete 360° security of the workspace is advantageously provided by the presence of an automatic access gate, or any other means of closing access to the workspace.

[0087] By "automatic" here we mean the fact that the gate returns automatically, without any action from the operator, to its position for closing the workspace.

[0088] Advantageously, entry and exit from the work space at height is controlled by an automatic gate.

[0089] In an advantageous implementation, entry into the workspace is effected by opening the access gate, this opening being caused by the passage of the user's body, or by manual operation of the gate by the user. Entry into the workspace can thus be effected when the user has loaded arms or is carrying tools.

[0090] Advantageously, the exit from the workspace can be carried out by opening the gate towards the outside of the workstation. Advantageously, the platform is provided with means preventing the accidental opening of the gate towards the outside, for example when the user present in the workspace leans on the gate. The workspace is thus protected against the risk of the user falling backwards.

[0091] In some implementations, not shown, the gate is double-leaf, the two leaves being of similar structure and mirroring each other with respect to a vertical plane. Alternatively, one of the two leaves is wider than the other.

[0092] In other implementations, the gate is provided with a single leaf, with a pivot axis arranged to the right or left of the ascent plane. As mentioned previously, in embodiments not shown, the platform comprises more than one ascent plane, and for example two ascent planes, each ascent plane being able to advantageously comprise an automatic gate which can open outwards, with a single or double leaf, or any other device for closing access to the work space.

[0093] Advantageously, the side members 4, 5, 8, 9, the rails 23, 24 and the gate leaves are formed by cutting, folding, bending, and assembly, from the same metal tube, for example an aluminum alloy tube of round section, or from a composite tube, for example from pultrusion.

[0094] In other embodiments, not shown, at least one of the gate leaves comprises a solid or perforated plate. This arrangement can enhance the feeling of security for the user present in the workspace, and reduces the risk of falling objects. The guardrail and the gate are articulated, the platform being able to be transported or stored in a compact folded position. Advantageously, the articulation means of the guardrail and the gate do not extend towards the interior of the workspace.

[0095] In the embodiment shown in Figures 1 and 2, no part of the platform projects above the upper rail 24 of the guardrail. The user present in the workspace thus benefits from 360° safety, with no part of the platform obstructing his view or arm movements.

[0096] As can be seen in particular in Figure 2, in the deployed position of use, the gate leaves are arranged substantially vertically.

[0097] By "substantially vertically" is meant here the fact that the leaves of the gate (or any other device for closing the work space) extend vertically or in a plane forming an angle of a few degrees with the vertical, when the platform 1 is in the deployed position. The surface of the floor 21, the surface of the work space, and the shelves 25, 26 are inscribed in the support polygon of the platform 1, defined by the non-slip pads 15-18. These arrangements greatly reduce the risks of the platform tipping over during its use.

[0098] The use of stabilizers 30, 31 makes it possible to increase the surface area of ​​the support polygon of the platform 1.

[0099] The stabilizers 30, 31 are in the folded, storage position, in Figures 1 and 2. In this storage position, the stabilizers 30, 31 extend substantially parallel to the side members 5, 8 of the second base 2, and are held in this folded position by locking means forming a clamp.

[0100] The term clamp is used here because the means for holding the stabilizers in the storage position comprise at least one movable jaw, and advantageously two jaws articulated to each other, between an open position and a closed position.

[0101] A return means exerts a force on the movable jaw, advantageously on each of the two articulated jaws, maintaining the jaw(s) in the open position.

[0102] The means for holding the stabilizers in the stowed position define a placement space for the stabilizer.

[0103] In the closed position of the two articulated jaws, the stabilizer is held in the storage position.

[0104] In the open position of the two articulated jaws, the stabilizer can be brought manually between the two jaws, or be moved away from the space delimited by the two jaws. In the open position of the two articulated jaws, the manual application of a force on the stabilizer, against the jaws, causes the clamp to close around the stabilizer, the stabilizer being held in the storage position by the closing of the clamp.

[0105] In the clamp closed position, the stabilizer can be manually maneuvered to move it away from the clamp, this maneuver causing the clamp to open.

[0106] As will appear in detail in the remainder of this description, the holding means comprise a return means, with a support zone for the profile, so that a pressure action applied by the profile on the support zone drives the movable jaws from their open position to their closed position, the profile then being held in the placement space.

[0107] In certain embodiments, not shown, the stabilizers are of fixed length and are for example formed from a single piece, such as a profile of round or polygonal section.

[0108] Advantageously, the stabilizers are adjustable in length.

[0109] In the embodiment shown, the stabilizers are of adjustable length, and comprise at least two tubular elements 40, 41 mounted in a telescopic manner.

[0110] Means allow the two tubular elements 40, 41 to be locked at the desired length for the stabilizer.

[0111] In some implementations, the locking means are of the pin or peg type entering into slots or notches, such locking means making it possible to obtain several predefined lengths for the stabilizer.

[0112] Such means are known per se and described for example in documents US 1 61 0596, US3901354, US 3508628, US 41 75641, US 4433754, US 2008000721.

[0113] Such locking methods do not allow precise adjustment of the height of a stabilizer, due to the excessive spacing between the predetermined positions. A user may thus find himself in a situation where stable support is impossible, forcing him to move the working device at height, to be able to find a support surface for the stabilizers.

[0114] In some implementations, the adjustment of the length of the stabilizers is said to be millimetric, that is to say over a predetermined adjustment range. Such an adjustment is obtained by providing the stabilizer with a means for locking and unlocking the telescopic tubes between them. To adjust the height of the stabilizer, the user unlocks the tubes between them, adjusts the length to the desired dimension, by moving one of the tubes, then locks the tubes between them. In particular implementations, clamping ring or screw mounts are used.

[0115] The use of a screw system, the principle of which is disclosed, for example, in document US38561 1 2, may prove to be destructive for the clamped tube, as the screw may leave traces or marks on the blocked tube. In addition, the tube serving as support for the screw is weakened, as it is pierced to allow the screw to be inserted.

[0116] The principle of clamping rings is known in itself, and described for example in documents US4872529, GB21 80875, or

[0117] WO201 21 68684.

[0118] Such ring assemblies do not always offer optimal safety, because there is no indication to the user that the tightening torque is sufficient to allow the tubes to be securely locked together. In addition, such a ring, particularly when made of thermoplastic material, can deteriorate from repeated tightening and loosening. In addition, installing a stabilizer equipped with a ring is not without difficulties. The user must first loosen the ring, position the stabilizer by positioning the tubes together, then tighten the ring, while maintaining the position of the stabilizer. Such an assembly requires the use of both hands on the stabilizer, and a certain dexterity on the part of the user, to maintain the position when tightening the ring.

[0119] Advantageously, in the embodiment shown, in order to overcome the drawbacks of the systems presented above, a buttress is used to block the tubes of a stabilizer together.

[0120] This buttressing is ensured by a plate 42 provided with a passage hole for a tubular element 40.

[0121] Such locking means allow the stabilizer to be extended to any desired length for ground support, and locked in this telescoped ground support position. Such locking means are known per se and described for example in document FR2914338 (DUARI B). In the embodiment shown, the two stabilizers 30, 31 are symmetrical to each other, with respect to a plane perpendicular to the second base 3 and arranged at a distance from the side members 8, 9. The stabilizers 30, 31 are advantageously metallic, for example made of aluminum alloy, and comprise a first tube 40 slidably mounted in a second tube 41.

[0122] The first tube 40 comprises a first end 43 articulated to the spar 8 and a second end inserted into the second tube 41.

[0123] In the embodiment shown, the articulation of the first tube 40 to the side member is a pivot connection, along an axis inclined relative to the plane of the stand 3.

[0124] In other embodiments, not shown, this articulation is a spherical connection.

[0125] The second tube 41 has a first end part 44 intended to come into contact with the ground, and advantageously carrying a non-slip pad.

[0126] In the embodiments shown, the stabilizers 30, 31 comprise connecting rods or braces 45, which absorb the bending stresses.

[0127] The connecting rod 45 comprises a first extreme end 46, pivotally mounted relative to the spar 8, and a second extreme end 47, pivotally mounted relative to the second tube 41.

[0128] The stabilizer 30, 31 thus forms an articulated assembly, which can be operated with a single hand.

[0129] We now refer to figures 4 and 5 which illustrate an implementation of the holding means forming a clamp.

[0130] In the implementation shown, the clamping means 50 comprise two jaws 51, 52 articulated together around an axis 53. The clamping means 50 comprise a chassis 54, allowing mounting on a spar.

[0131] The first jaw 51 is pivotally mounted on the chassis 54, around an axis 55. The second jaw 52 is pivotally mounted on the chassis 54, around an axis 56, the three pivot axes 53, 55, 56 of the jaws 51, 52 being substantially parallel.

[0132] In one implementation, the pivot axes 53, 55, 56 are defined by hollow rivets, for example made of steel or brass, mounted on a frame 54 made of polymer material, for example produced by injection. In other implementations, the frame 54 is made of metallic material, for example aluminum alloy, or composite material.

[0133] A first jaw 51 has a concave internal face 57, of a shape complementary to that of the second tube 41 of the stabilizer.

[0134] In the embodiment shown, the second tube 41 has a round external section, the internal face 57 of the first jaw 51 having a substantially constant radius of curvature.

[0135] A second jaw 52 has a concave internal face 58, of a shape complementary to that of the connecting rod 45.

[0136] In the embodiment shown, the connecting rod 45 has a square external section, the internal face 58 of the second jaw 52 having a first section 59 and a second section 60 substantially perpendicular to the first section.

[0137] The two jaws 51, 52 are connected to each other by a flexible portion 61, on which the pivot axis 53 is placed.

[0138] D is the distance between the pivot axes 55, 56 of the two jaws 51, 52.

[0139] D2 is the distance between the pivot axis 55 of the first jaw

[0140] 51 and the pivot axis 53.

[0141] D1 is the distance between the pivot axis 56 of the second jaw

[0142] 52 and the pivot axis 53.

[0143] Advantageously, D is less than the sum D1 + D2.

[0144] A first advantage is that, during the opening and closing movements of the clamp, the movement of the axis 53 involves stressing the bending zone 61.

[0145] A second advantage is that the opening and closing positions of the clamp are stable and defined positions.

[0146] This reduces the risk of accidental opening of the clamp. It is only when the user exerts manual force on the stabilizer, exceeding the clamping resistance of the clamp, that opening is achieved and the stabilizer released.

[0147] The risks of accidental closing of the clamp are also reduced. It is only when the user exerts a manual force on the stabilizer, exceeding the closing resistance of the clamp, that closure is obtained automatically, and the stabilizer maintained in the storage position. The user exerts a manual force on the stabilizer on the zone 61 forming a support zone for the stabilizer profile. This force on the support zone causes the movement of the two jaws 51, 52 from their open position to their closed position. The stabilizer is then maintained in the placement space delimited by the frame 54 and the jaws 51, 52.

[0148] In the embodiments shown, the stabilizers comprise a connecting rod (or brace), and each of the two jaws has an internal face of a shape complementary to an element of the stabilizer.

[0149] In other embodiments, not shown, the stabilizers do not include a link.

[0150] In certain implementations, not shown, means ensure locking of the axis 53 in the closed position of the clamp.

[0151] In the embodiments shown, the return means of the two jaws are of the mechanical, elastic type, for example formed by a material with a high modulus of elasticity.

[0152] In other embodiments, not shown, pneumatic or hydraulic return means can be implemented.

[0153] The invention has many advantages.

[0154] The clamp-like holding means are ergonomic. The user does not have to bend down to deploy or retract the stabilizers, and both stowing and deploying the stabilizers can be done with one hand, without excessive effort.

[0155] The clamp is held securely in the open position, reducing the risk of accidental closing. The user does not need to manually operate the clamp to return it to the open position. The clamp is held securely in the closed position, effectively holding the stabilizer in the storage position.

[0156] The clamp-forming holding means are simple and intuitive to use. Advantageously, a color is used for the jaws of the clamp, drawing the user's attention to these holding means. From the first contact of the stabilizer with the clamp, a simple push on the stabilizer causes the clamp to close automatically. This closing advantageously generates a characteristic sound, confirming to the user that locking has been obtained. The clamp-forming holding means ensure automatic locking of the stabilizers in the storage position. In particular, when the stabilizer is mounted in a pivot connection relative to the side member, the movement of the stabilizer is carried out substantially along a plane, naturally bringing the stabilizer opposite the open clamp. The bringing together of the stabilizer and its pressing against the clamp causes automatic closing of the clamp.

[0157] The holding means comprise a small number of parts, the jaws forming the jaws, and the flexible connection between the jaws forming the support zone for the stabilizer and spring.

[0158] The clamp-forming holding means lock in the storage position both a single profiled element (such as a single-piece support leg) and a set of articulated profiles. As described, an assembly comprising a connecting rod (or brace) and two telescopic tubes can be held in position, one of the jaws holding the connecting rod, the other jaw holding the two tubes. The shape of the jaws (or jaws) advantageously matches that of the stabilizer elements (connecting rod, profile), so that the operation of these elements drives the jaws until the clamp opens.

[0159] The clamp-forming holding means are advantageously used for PIR or PI RL type platforms, the stabilizers being held in the folded position, for transporting and storing the platforms.

[0160] Clamp-like holding devices are also used for other working at height devices, such as ladders, steps, stepladders, or scaffolding.

Claims

Claims 1. Holding means (50) in the storage position of a profile of a working device at height, in particular a stabilizer profile (30, 31), the holding means (50) being characterized in that it comprises a placement space for the profile, and a movable jaw (51, 52) between an open position and a closed position of this placement space, a return means exerting a force on the movable jaw (51, 52) by maintaining the movable jaw in the open position, the return means comprising a support zone for the profile, so that a pressure action applied by the profile on the support zone drives the movable jaw (51, 52) from its open position to its closed position, the profile then being held in the placement space.

2. Holding means (50) according to claim 1, characterized in that it comprises two jaws (51, 52), each of the two jaws (51, 52) being movable between an open and closed position, the return means exerting a simultaneous force on each of the two jaws (51, 52) while holding them in their open position, a pressure action applied by the profile on the support zone driving the two jaws (51, 52) from their open position to their closed position, the profile then being held in the placement space.

3. Holding means (50) according to claim 2, characterized in that each of the two jaws (51, 52) comprises a first rigid part and a second flexible part, the two flexible parts of the two jaws (51, 52) forming the support zone for the profile.

4. Holding means (50) according to claim 3, characterized in that it comprises a frame (54) on which the two jaws (51, 52) are mounted pivoting around substantially parallel axes (55, 56), the two flexible parts being mounted articulated around an axis (53) substantially parallel to the pivot axes (55, 56) of the two jaws (51, 52).

5. Holding means (50) according to claim 4, characterized in that the distance (D) between the two pivot axes (55, 56) of the jaws (51, 52) relative to the chassis (54) is less than the sum of two inter-axis distances (D1, D2), namely on the one hand the distance (D2) between the axis (53) of articulation of the two flexible parts and the pivot axis (55) of a first jaw (51) and on the other hand the distance (D1) between the axis (53) of articulation of the two flexible parts and the pivot axis (56) of the second jaw (52).

6. Holding means (50) according to any one of claims 2 to 5, characterized in that each of the two jaws (51, 52) has a concave internal surface (57, 58), facing towards the inside of the placement space for the profile when the jaw (51, 52) is in the closed position, each of the two internal surfaces (57, 58) being complementary to a part of the external surface of the profile.

7. Assembly comprising a stabilizer (30, 31) and a holding means (50) according to any one of claims 1 to 6, characterized in that the stabilizer (30, 31) comprises a first tube (40), a second tube (41), and a system for blocking the sliding of the first tube (40) inside the second tube (41).

8. Assembly according to claim 7, characterized in that the stabilizer (30, 31) comprises a connecting rod (45).

9. Assembly according to claim 8, characterized in that each of the two jaws (51, 52) has a concave internal surface (57, 58), facing towards the inside of the placement space when the jaw is in the closed position, the concave internal surface (57) of a first jaw (51) being complementary to the external surface of the second tube (42), the concave internal surface (58) of the second jaw (52) being complementary to the external surface of the connecting rod (45). 1 0. Device for working at height incorporating an assembly according to any one of claims 7 to 9.

11. Working at height device according to claim 10, characterized in that the device is a PIR individual rolling platform or a PIRL light individual rolling platform.

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