FR3068376A1 - SYSTEM FOR FASTENING A STIFFENER TO A SCAFFOLDING - Google Patents

Abstract

Fastening system (17) for fastening a stiffener (3) to a scaffolding upright (6), said upright being provided with a housing (7), the housing having a constriction (9), the fastening system comprising : means (21) for fixing to the stiffener; a locking member (28) movable between a locking position (29) preventing it from passing through the narrowing and an unlocking position allowing it to pass through the narrowing; control means (33) integral with the locking element, the control means being configured to dispose the locking element in the locking position or in the unlocking position, the locking element being intended, when it is in the unlocking position, to be inserted in the housing of the post beyond the narrowing so that, when the blocking element is in the locking position, the locking element and the control means are disposed of and other of the narrowing.

Description

SYSTEM FOR ATTACHING A STIFFENER TO A SCAFFOLD The invention relates to the field of scaffolding, and more particularly to the assembly of scaffolding.

Scaffolds are structures composed of an arrangement of tubes, so as to form a work station at height for an operator. These are temporary structures, which are found in particular on construction sites.

By scaffolding, here is meant any construction or temporary, fixed or mobile frame, facilitating access to the works and carrying out works.

Are particularly concerned by the present invention: foot scaffolding, that is to say scaffolding on vertical planes for work on facades and parts in elevation; rapid metal scaffolds, in modular elements, sometimes called tubular scaffolds; ceiling scaffolding or horizontal scaffolding, that is to say light tubular scaffolding, generally mobile (rolling) and scaffolding on trestles; the tilting scaffolding carried by cross braces against window frames; fan-shaped scaffolding carried by inclined brackets or pointers, resting on the supports of the bays and immobilized by spacers or struts.

The invention finds a particularly advantageous application for rapid scaffolding.

In a conventional assembly, of fairly old design, a scaffold comprises vertical uprights, formerly known as poles, ecoperches, pointiers, these uprights being spaced in the direction of the length of the scaffolding by horizontal beams. Conventionally, the scaffolding comprises crosspieces such as horizontal dies, tendières, boulins, handling members, platform support, diagonal braces of bracing, connected separately to the uprights or scoops.

Thus, for example, a conventional scaffolding comprises two ladders with uprights and tubular rungs and of round section, the ladders being connected to each other vertically by at least two diagonal bars fixed in a cross and on each side of the scaffolding, the bars being fixed at their ends to ladder rungs.

To make a scaffold, it is thus necessary to attach to uprights, grab bars, struts, ends of connecting elements, of the spacer type, to reinforce, stabilize, stiffen, triangulate. construction, so as to prevent it from collapsing and to avoid relative displacements of the scaffolding parts.

The standards NF EN 12811-1 and NF EN 1004 indicate some requirements which must be met by scaffolding. In particular, between the vertical tubes, called posts, the scaffolding must include lateral protection on workstations, consisting at least of the arrangement of two horizontal tubes, called healds, and a plinth. It should be ensured that the beams cannot be dismantled inadvertently. Tubes mounted diagonally between two posts, and thus called diagonals, must form a brace in the vertical plane of the posts, so as to ensure the stability of the scaffolding, despite the stresses which it supports, such as the stresses due to the wind, to the movements of the operators, to the load of the tools of the operators, to the movements of the ground.

In general, the rails and the diagonals are fixed to the posts by means of screws. However, the use of screws and bolts also means using suitable tools, which complicates the installation of the scaffolding on a site.

The scaffolding being a temporary structure, it is advantageous to be able to easily assemble it and then disassemble it, to store it and to reassemble it for later use.

This is why means for assembling healds and diagonals have been developed for this purpose.

[013] For example, document FR 2 922 929 proposes to mount a heddle between two scales of the scaffolding, by means of a hook which can be locked on a bar. To this end, the hook is manipulated by a pole to lock and unlock it. Although such a hook device makes it possible to assemble and disassemble the boom without damaging the scaffolding tubes, the manipulation of the pole requires a certain dexterity on the part of the operator, making the assembly and disassembly steps delicate. .

[014]

In order to facilitate assembly and disassembly, locking handles have been developed making it possible to block two tubes by rotation of the handle around an axis passing through the two tubes, so that the handle grips the two tubes. one over the other.

Document FR 2 880 048 describes an example of such a handle for locking a diagonal on a post. For this purpose, the end portion of the diagonal is flattened. The handle has a first extreme right part inserted first in a hole in the flat portion of the diagonal then in a hole in the post, forming the axis of rotation. The handle also has a second U-shaped part, ending in a grip zone, which pinches the post when pivoting around the axis, and thus clamps the post against the diagonal. By rotating the handle in the opposite direction, the post and the diagonal are unlocked.

Document FR 2 887 272 describes another example of a locking handle, operating in a manner substantially identical to the handle of document FR 2 880 048, but the second tightening part of which ends with an elastic return passing behind the post when the handle is in the locked position.

Document FR 2 970 023 describes a device for locking two scaffolding elements, this device comprising a handle obtained by folding a wire element, this handle comprising a flange part, the locking of a secondary element such as a diagonal, on a main element such as a scaffolding upright, being obtained by elastic deformation of the part of the handle forming a flange, during manual pivoting of the handle.

Document FR 2 927 919 describes a locking handle with assembly nuts for scaffolding ladders. The assembly nut is mounted to rotate freely on a hub fixed on a diagonal end. The assembly nut is provided with sliding ramps allowing its pre-positioning in a non-circular reservation of the upright, without manual intervention. The diagonal is locked on the scaffolding upright by manual rotation of a handle pressing against the upright with increasing clamping force.

One can also refer to documents EP 2314796, EP 2314797.

A first objective is to propose a system for fixing a stiffener to a scaffold, reducing the time for fixing and dismantling the stiffener.

A second objective is to propose such a fixing system, which is easy to fix on a support of the scaffolding and to separate from it.

[022] A third objective is to propose such a fixing system, which is light and compact.

A fourth objective is to propose such a fixing system, simple to manufacture.

For these purposes, it is proposed, firstly, a fixing system intended to secure a stiffener to a scaffold post, the amount being provided with a housing, the housing having a narrowing, the fixing system including:

a means of fixing to the stiffener, a blocking element, movable between a blocking position preventing it from going through the narrowing and an unlocking position allowing it to go through the narrowing, a control means, integral with the element of locking, the control means being configured to place the locking element in the locking position or in the unlocking position, the locking element being intended, when it is in the unlocking position, to be inserted into the housing the amount beyond the narrowing so that, when the locking member is in the locked position, the locking member and the control means are arranged on either side of the narrowing.

Various additional characteristics can be provided for the fixing system, alone or in combination:

the blocking element has, substantially perpendicular to a direction in which the blocking element is able to pass through the narrowing, a first blocking dimension and a second blocking dimension having the following characteristics:

the first blocking dimension and the second blocking dimension are less than or equal to a first dimension for passage of the narrowing, the first blocking dimension is greater than a second dimension for passing the narrowing, the second blocking dimension is less than or equal to the second passage dimension;

the locking element has an oblong shape;

the locking element is movable, between the locking position and the unlocking position, in rotation about an axis securing the locking element and the control means;

the axis comprises a flat configured to drive the locking element in rotation, the locking element being movable in translation along the flat;

the fixing system comprises a projection provided with a hole through which the axis crosses the projection so that the locking element and the control means are arranged on either side of the projection, the projection , having a shape substantially complementary to the shape of the narrowing, is intended to be inserted in the housing of the upright;

the control means include:

a locking lug capable of locking, in cooperation with a notch in the fixing system of shape substantially complementary to the shape of the locking lug, the locking element in the locking position, an unlocking lug, of substantially shaped complementary to the shape of the notch, able to block, in cooperation with the notch, the locking element in the unlocked position.

[026] It is proposed, secondly, a scaffold stiffener, comprising two healds, at least one cross member joining the two healds, four fastening systems as presented above, each fastening system being integral, by the through their fastening means, at one end of the rails.

[027] As a variant, each heddle comprises a folding member provided with two parts movable between them according to a rotational movement, the folding members being intended to allow folding of the scaffolding, so as to reduce its bulk.

[028] It is proposed, thirdly, a scaffolding comprising: two supports, each provided with two uprights and at least two bars connecting the two uprights, the bars crossing each side of each upright so as to define in each upright two housings each having a narrowing, a floor connecting the two supports, a stiffener as presented above, the blocking element of each stiffener fixing system being intended to pass in each narrowing of the uprights.

[029] Other characteristics and advantages of the invention will appear more clearly and concretely on reading the following description of embodiments, which is made with reference to the appended drawings in which:

Figure 1 is a schematic perspective view of a platform provided with two supports and a stiffener;

FIG. 2 is a schematic perspective view of a housing of one of the supports and of a fastening system for the stiffener, one blocking element of which is disposed in an unlocking position, the fixing system being extracted from the housing;

Figure 3 is a schematic perspective view of the fastening system, the fastening element is arranged in a locking position;

Figure 4 is a schematic side sectional view, along the plane C-C shown in Figures 5 and 7 of the fixing system inserted in the housing, the locking element being in the locking position;

Figure 5 is a schematic sectional view from above, along the plane D-D shown in Figures 4 and 6 of the fixing system inserted in the housing, the locking element being in the locking position;

Figure 6 is a schematic side sectional view, along the plane C-C shown in Figures 5 and 7 of the fixing system inserted in the housing, the locking element being in the unlocked position;

Figure 7 is a schematic sectional view from above, along the plane D-D shown in Figures 4 and 6 of the fixing system inserted in the housing, the locking element being in the unlocked position.

The invention finds particular application in platforms and scaffolding with ladders formed by rungs crimped in the uprights, these rungs being of oval or oblong section, such rungs being described in particular in document EP 1 762 694 of the applicant .

[031] The structure of such scales is advantageous for at least two reasons. First, the risks of rotation of the rung on itself, when using the ladder, are reduced. Secondly, such scales can be made of aluminum alloy, with an excellent weight / mechanical strength ratio, in particular compared to conventional steel scales. During assembly by crimping, the tubular rungs are provided, on their two lateral ends, with at least one constriction which engages in the holes of the uprights. The end of these necks protrudes from the external face of the uprights. It is deformed by crimping, or even by rolling, embossing, or stamping. The steps thus have an apparent opening, advantageously bordered by a collar obtained by rolling and pressing under a roll.

In Figure 1 is partially shown a scaffolding, comprising a platform 1 formed of two supports 2 of ladder type, a stiffener 3 and a floor 4. The railings are not shown, for simplification.

The supports 2 support the floor 4 in a substantially horizontal position, at a predetermined height. The floor 4 is thus intended to support an individual, allowing him to perform work at height, or facilitating him access at height.

[034] Each support 2 comprises bars 5 and two uprights 6, to which are fixed the bars 5 forming steps. The bars 5 are preferably fixed substantially perpendicular to the uprights 6 and arranged substantially equidistant from each other, so as to form a ladder.

According to the example illustrated, the uprights 6 include housings 7 through which the bars pass 5. According to examples not shown, the uprights 6 include more housings 7 than bars 5 or the bars 5 are fixed to the uprights 6 without passing through the housings 7.

The bars 5 and uprights 6 have, for example, a cross section of rectangular, square, ellipsoidal or circular shape.

[037] Each housing 7 has at least one opening 8 and a narrowing 9. According to the embodiment shown, the opening 8 and the narrowing 9 are arranged in an aligned and consecutive manner.

[038] Each narrowing 9 comprises a first dimension 10 for passage and a second dimension 11 for passage less than the first dimension 10 for passage.

According to the illustrated embodiment, the first dimension 10 of passage and the second dimension 11 of passage are measured in substantially perpendicular directions.

[040] As shown in Figures 4 to 7, according to embodiments, the bars 5 comprise two end portions 12 of complementary shape to the shape of the housings 7 in which the end portions 12 are inserted.

[041] During assembly by crimping, the end portions 12 of the tubular bars 5 each form a constriction which engages in the holes of the uprights 6. The end of these constrictions projects into the external face of the uprights 6. It is deformed by crimping, or even by rolling, embossing, or stamping. The rungs formed by the bars 5 thus have an apparent opening, advantageously bordered by a collar 13 obtained by rolling and pressing under a rolling.

[042] The bars 5 comprise a central part 14 having a cross section of which at least one dimension is greater than a dimension of the end parts 12. The central part 14 is arranged between the uprights 6 of the support 2.

[043] As illustrated in FIG. 1, the stiffener 3 comprises two healds 15 and cross members 16 joining the healds 15 so as to form a substantially non-deformable frame. According to a different embodiment, not shown, the stiffener 3 comprises a single crosspiece 16.

[044] According to an embodiment not shown, each heald 15 of the stiffener 3 comprises a folding member, configured to allow the folding of the stiffener 3 on itself. The folding members are, for example, arranged substantially in the middle of the heddles 15. Such folding members make it possible to reduce the size of the stiffener during its storage.

The stiffener 3 also comprises four fixing systems 17, arranged at ends 18 of the heddles 15. The fixing systems 17 are intended to secure the stiffener 3 and the supports 2.

[046] FIGS. 2 and 3 show an enlarged perspective view of the platform 1, centered on one of the fixing systems 17, the fixing system 17 being extracted from the housing 7.

[047] Figures 4 to 7 show an enlarged view, in section respectively on a plane CC and a plane DD, of the platform 1, centered on one of the fastening systems 17, the fastening system 17 being inserted in the housing 7 .

[048] The fixing system 17 comprises a main body 19 and a locking member 20.

[049] The main body 19 comprises a fixing means 21, intended to secure the system 17 for fixing to one of the ends 18 of one of the heddles 15 of the stiffener 3.

[050] According to one embodiment, the fixing means 21 comprises a screw 22 and a nut 23. The screw 22 is intended to be inserted in a slot 24 in the end 18 of the heddle 15.

[051] The screw 22 preferably extends into the main body 19. Thus, the main body 19 is stiffened and the screw 22 is locked in rotation relative to the main body 19.

[052] The main body 19 also includes a projection 25 intended to be inserted in the housing 7. The projection 25 has a shape substantially complementary to the housing 7. Thus, when the support 2 is inserted in the housing 7, the projection 25 blocks degrees of freedom between the fixing system 17 and the support 2, in order to increase, by means of the stiffener 3, the relative rigidity of the supports 2.

[053] The main body 19 comprises a stop 26, intended to come into abutment against the fixing in [054] The complementary stop allows, as in the upright 6 so as to block the housing insertion 7 at a predefined position.

preferably has the shape of the upright 6. The shape of the system forms the stop 26 for freedom between the fixing system 17 and the support 2 in order to increase, by means of the stiffener 3, the relative rigidity of the supports 2 .

[055] According to the illustrated embodiment, the main body 19 includes a recess 27. The recess 27 has a shape complementary to the collars 13 of the bars 5, so that the stop 26 comes into contact with the upright 6 without being hindered by the collar 13.

[056] The blocking member 20 of the fixing system 17 comprises a blocking element 28, movable between a blocking position 29 (shown in FIGS. 4 and 5) and a release position 30 (shown in FIGS. 2, 3, 6 and 7).

[057] In the unlocking position 30, the blocking element 28 is able to pass through the narrowing 9, allowing insertion of the fixing system 17 into the housing 7 or extraction of the fixing system 17 from the housing 7.

[058] In the blocking position 29, the blocking element 28 cannot pass through the narrowing 9, blocking an insertion of the fixing system 17 into the housing 7 or an extraction of the fixing system 17 from the housing 7.

[059] The locking element 28 is preferably movable between the locking position 29 and the unlocking position 30 in a rotational movement around the direction in which the fixing system 17 is inserted in the housing 7.

The blocking element 28 has a first blocking dimension 31 and a second blocking dimension 32 smaller than the first blocking dimension 31.

[061] According to the illustrated embodiment, the first blocking dimension 31 and the second blocking dimension 32 are measured in substantially perpendicular directions.

[062] The first dimension 31 for blocking the blocking element 28 is less than or equal to the first dimension 10 for passage of the narrowing 9.

The second blocking dimension 32 is less than or equal to the second passage dimension 11.

[064] In order to pass the blocking element 28 through one of the constrictions 9, the blocking element 28 is disposed in the unlocking position 30.

The first blocking dimension 31 and the first dimension 10 for the passage of said narrowing 9 follow substantially the same first direction. The second blocking dimension 32 and the second dimension 11 for the passage of said narrowing 9 follow substantially the same second direction.

[066] The first dimension 31 for blocking the blocking element 28 is greater than the second dimension 11 for passing the narrowing 9.

[067] In order to prevent the blocking element 28 from passing through one of the constrictions 9, the blocking element 28 is disposed in the blocking position 29.

The first blocking dimension 31 and the second dimension 11 for the passage of said narrowing 9 follow substantially the same second direction. The second blocking dimension 32 and the first dimension 10 for the passage of said narrowing 9 follow substantially the same first direction.

[069] According to the embodiment shown, the blocking element 28 has a substantially oblong shape.

The blocking member 20 comprises a control means 33, configured to move the blocking element 28 between the blocking position 29 and the unlocking position 30.

[071] According to the embodiments shown, the control means 33 comprises a protruding locking pin 34. The locking lug 34 is able to cooperate with a notch 35 in the main body 19. The locking lug 34 is configured so as to maintain the control means 33 and therefore the locking element 28 in the locking position 29.

[072] The locking lug 34 thus improves the security of the platform 1, when the fixing system 17 is inserted into the housing 7 of one of the supports 2 so that the fixing system 17 cannot be removed or get out of the housing 7 accidentally.

[073] The control means 33 comprises a lug 36 for projecting release. The unlocking lug 36 is able to cooperate with the notch 35 of the main body 19. The unlocking lug 36 is configured so as to keep the control means 33 and therefore the locking element 28 in the unlocked position 30.

The unlocking lug 36 thus facilitates the handling of the stiffener 3, allowing a single individual to insert the four fastening systems 17 into the housings 7 of the supports 2 or to extract the fastening systems 17 from the housings 7 without the blocking elements 28 moving into the blocking position 29 accidentally.

[075] The locking lug 34 and the unlocking lug 36 preferably have a shape complementary to the shape of the notch 35. The locking lug 34, the latch lug 36 and the notch 35 have, according to the preferred embodiment, a substantially cylindrical shape.

[076] The blocking member 20 also comprises an axis 37 connecting the blocking element 28 and the control means 33.

[077] The axis 37 preferably comprises two flats 38, arranged on either side of the axis 37. The flats 38 are configured to cooperate with an orifice 39 of the blocking element 28.

[078] The orifice 39 has, according to the embodiment shown, a substantially oblong shape, comprising two dishes 40 substantially parallel.

[079] The dishes 40 of the orifice 39 are configured to cooperate with the flats 38 of the axis 37. The orifice 39 is configured to block a relative rotational movement between the blocking element 28 and the axis 37 , around the direction in which the fixing system 17 is inserted into the housing 7, while leaving free in translation the element 28 for locking relative to the axis 37, along planes defined by said dishes 40 and the flats 38.

The axis 37 also includes two walls 41 arranged on either side of each flat 38. The blocking element 28 is disposed between the walls 41, so as to substantially block the position of the element 28 of locking relative to axis 37 in the direction in which the fastening system 17 is inserted in the housing

7.

[081] In a different embodiment, the axis 37 comprises a single flat 38 able to cooperate with one of the dishes 40 of the orifice 39 of the blocking element 28.

[082] According to the illustrated embodiment, the projection 25 of the main body 19 comprises a hole 42. The axis 37 crosses the projection 25 through the hole 42.

[083] The blocking member 20 is arranged such that the blocking element 28 and the control means 33 are arranged on either side of the hole 42.

[084] According to the embodiments shown, the hole 42 also extends through the stop 26.

[085] The axis 37 extends into the control means 33. Thus, the control means 33 is stiffened and the axis 37 is locked in rotation relative to the control means 33.

[086] According to certain embodiments, the main body 19 is in one piece. The main body 19 and / or the control means 33 are produced by molding, for example made of aluminum alloy, of polymer material or of composite.

[087] In order to insert the fixing system 17 into a housing 7, the blocking element 28 is arranged in the unlocking position 30. The unlocking lug 36 of the control means 33 thus cooperates with the notch 35 of the main body 19, so as to maintain the locking element 28 in the unlocking position 30.

The fastening system 17 is inserted into said housing 7 of [088] until the stop 26 of the main body 19 comes into uplink contact 6. The narrowing blocking element 28 and is arranged beyond the narrowing 9 opposite the opening 8 of [089] The blocking element 28 is then placed in a blocking. The lug 34 for blocking the means 33 thus cooperates with the notch 35 of the main body 19, is then passed from the narrowing 9, housing 7.

by side the position controls the so as to maintain the locking element 28 in the locking position 29.

[090] In order to extract the system 17 for fixing a housing 7, the blocking element 28 is disposed in the unlocking position 30. The unlocking lug 36 of the control means 33 thus cooperates with the notch 35 of the main body 19, so as to maintain the locking element 28 in the unlocking position 30.

[091] The fixing system 17 is extracted from said housing 7. The blocking element 28 is then passed through the narrowing 9 and then through the opening 8 of the housing 7.

[092] In order to fix the stiffener 3 to the uprights 6 of the supports 2, the elements 28 for locking the fixing systems 17 are arranged in the unlocking position 30. Each unlocking lug 36 thus cooperates with its respective notch 35, so as to maintain the locking elements 28 in the unlocked position 30.

The fastening systems 17 are inserted at the same time, through the frame of the stiffener 3, into their respective housing 7 until the stops 26 come into contact with the uprights 6. The locking elements 28 are then passed through the respective constrictions 9 and are disposed beyond the constrictions 9, on the side of the constrictions 9 opposite the openings 8 of the housings 7.

The blocking elements 28 are then placed in the blocking position 29. Each locking pin 34 thus cooperates with its respective notch 35, so as to maintain the locking elements 28 in the locking position 29.

[095] In order to separate the stiffener from the uprights 6, the locking elements 28 of the fixing systems 17 are arranged in the unlocking position 30. Each unlocking lug 36 thus cooperates with its respective notch 35, so as to maintain the locking elements 28 in the unlocked position 30.

The fastening systems 17 are extracted at the same time, through the frame of the stiffener 3, from their respective housing 7. The blocking elements 28 are then passed through the respective constrictions 9, then through the openings 8 of the housings 7.

[097] Such fastening systems 17 are thus easy to fix to the supports 2 of the platform 1 and to separate from them.

The fixing system 17 is light, compact and simple to manufacture.

The fixing system 17 as described makes it possible to secure the fixing of a stiffener 3 to supports 2 of a platform 1.

The fastening system 17 also allows, to a single individual, to fix a stiffener 3 to the supports 2 of a platform 1 and to separate the stiffener 3 from the supports 2.

Claims (10)

1. A fastening system (17) intended to secure a stiffener (3) to an upright (6) of scaffolding, this upright being provided with a housing (7), the housing (7) having a narrowing (9), the fixing system (17) comprising: a means (21) for fixing to the stiffener (3), a movable blocking element (28) between a blocking position (29) preventing it from passing through the narrowing (9) and an unlocking position (30) allowing it to go through the narrowing (9), a control means (33) integral with the blocking element (28), the control means (33) being configured to dispose the blocking element (28) in the position ( 29) for locking or in the unlocking position (30), the locking element (28) being intended, when it is in the unlocking position (30), to be inserted into the housing (7) of the upright (6 ) beyond the narrowing (9) so that, when the locking element (28) is in the locking position (29), the locking element (28) and the control means (33) are arranged to on both sides of the narrowing (9). 2. Fixing system (17) according to the preceding claim, characterized in that the blocking element (28) has, substantially perpendicular to a direction in which the blocking element (28) is capable of passing through the narrowing ( 9), a first blocking dimension (31) and a second blocking dimension (32) having the following characteristics: the first blocking dimension (31) and the second blocking dimension (32) are less than or equal to a first dimension (10) for passage of the constriction (9), the first blocking dimension (31) is greater than a second dimension (11) for passage of the narrowing (9), the second dimension (32) for blocking is less than or equal to the second dimension (11) for passage. 3. Fixing system (17) according to the preceding claim, characterized in that the blocking element (28) has an oblong shape. 4. Fixing system (17) according to any one of the preceding claims, characterized in that the blocking element (28) is movable, between the blocking position (29) and the unlocking position (30), in rotation about an axis (37) joining the locking element (28) and the control means (33). 5. System (17) for fixing according to the preceding claim, characterized in that the axis (37) comprises a flat (38) configured to rotate the locking element (28), the element (28) of blocking being movable in translation along the flat (38). 6. Fixing system (17) according to any one of claims 4 and 5, characterized in that it comprises a projection (25) provided with a hole (42) through which the axis (37) crosses the projection (25) so that the blocking element (28) and the control means (33) are arranged on either side of the projection (25), the projection (25), having a substantially shaped complementary to the shape of the narrowing (9), is intended to be inserted into the housing (7) of the upright (6). 7. Fixing system (17) according to any one of the preceding claims, characterized in that the control means (33) comprises: a locking lug (34) capable of locking, in cooperation with a notch (35) of the fixing system (17) of shape substantially complementary to the shape of the locking lug (34), the element (28) of blocking in the blocking position (29), an unlocking lug (36), of shape substantially complementary to the shape of the notch (35), capable of blocking, in cooperation with the notch (35), the element (28) locking in the unlocking position (30). 8. Stiffener (3) for scaffolding, comprising: two healds (15), at least one crosspiece (16) joining the two healds (15), four fastening systems (17) according to any one of the preceding claims, each fastening system (17) being secured through of their fixing means (21), at one of the ends (18) of the heddles (15). 9. Stiffener (3) according to the preceding claim, characterized in that each heald (15) comprises a folding member provided with two parts movable together in a rotational movement, the folding members being intended to allow folding of the stiffener (3) so as to reduce its size. 10. Scaffolding (1) comprising: two supports (2) each provided with two uprights (6) and at least two bars (5) connecting the two uprights (6), the bars (5) crossing on each side each upright (6) so to be defined in each upright (6) two housings (7) each having a narrowing (9), a floor (4) connecting the two supports (2), a stiffener (3) according to any one of claims 8 and 9, the element (28) for blocking each system (17) for fixing the stiffener (3) being intended to pass through each narrowing (9) of the uprights (6).