FR2970017A1 - Device for assembling step on stringer of height access structure used for single plane ladder, has opening for insertion of one of end portions of steps, and anti-rotation unit allowing anti-rotation of step on support - Google Patents

Device for assembling step on stringer of height access structure used for single plane ladder, has opening for insertion of one of end portions of steps, and anti-rotation unit allowing anti-rotation of step on support Download PDF

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Publication number
FR2970017A1
FR2970017A1 FR1005164A FR1005164A FR2970017A1 FR 2970017 A1 FR2970017 A1 FR 2970017A1 FR 1005164 A FR1005164 A FR 1005164A FR 1005164 A FR1005164 A FR 1005164A FR 2970017 A1 FR2970017 A1 FR 2970017A1
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step
opening
device
anti
rotation
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FR1005164A
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French (fr)
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FR2970017B1 (en
Inventor
Patrick Lachant
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CDH GROUP, FR
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CENTAURE Sas
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Classifications

    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06CLADDERS
    • E06C7/00Component parts, supporting parts, or accessories
    • E06C7/08Special construction of longitudinal members, or rungs or other treads
    • E06C7/082Connections between rungs or treads and longitudinal members
    • E06C7/087Connections between rungs or treads and longitudinal members with a connecting piece installed around the rung

Abstract

Device (23) for assembling a step (13) on a support, the device (23) comprising an opening (26) for insertion of an extreme portion (21) of the step (13), said opening (26) being of non-circular section, and anti-rotation means of the step (13) on the support.

Description

Device for assembling a step on a support

The invention relates to the field of height access means structures. More specifically, the invention relates to an element for the assembly of steps for such structures particularly suitable for ladders, steps, and building stairs. The difference between a step and a ladder lies mainly in the height reached by one and the other. Indeed, in general, we reserve the term stepladder to designate structures comprising between one to five steps, while the term ladder means structures to achieve a higher height. On a building site, steps and ladders are usually used on an ad hoc basis, that is to say that they aim to stay in place for a few hours or even days, and to be easily moved. On the contrary, the building stairs are structures that are otherwise intended to be permanent for the duration of the project, at least to stay in place for several days. The slope of the stairs is generally less steep than those of the steps and ladders. Thus, for example, the NF P93-521 standard gives an inclination of 30 to 45 ° for the building stairs and 45 ° to 50 ° for the ladders. The stairs can then be supported a large circulation. Due to their increased stability, the stairs are used as a work station in preference to ladders and steps. In addition, stairs may be equipped with ramps or railings and skirting, increasing the safety of an operator working on the stairs. The steps are assembled for example by fixing them on their side edges, or from below. The assembly of the steps must make it possible to support the weight of the operators moving on them, which can be increased by the weight of the tools carried by the operators. For example, the stairs can be mounted between two walls, each side edge of the steps being attached to a wall.

EP 2 184 419 gives an example of means for fixing the steps on a wall. The step is fixed on a wall by a fastening interface attached to a lateral edge of the step, the interface being then fixed on the wall. Thus, the interface is fixed to the wall by means of screws and nuts, and is mounted on the step by the insertion of a lug of the interface in the step. The insertion may be forced, or an adhesive such as a resin may bind together. It is also known to assemble steps on stringers. The stringers can be placed on the side edges of the steps, on either side of each step, for ladders and steps as well as for stairs. Alternatively, support bars can be placed under the steps, joining them through the noses of the steps, especially for stairs, to provide greater resistance of the steps to bending. The silt mounting has a particular advantage for the construction site structures as it allows to have the complete structure of the ladders and steps, as well as the stairs, before the installation on the building site, and does not require or little to take in account the configuration of the ground to install a wall. Thus, the assembly is done at the factory, and the stages of assembly on the site, which can be made difficult because of the field conditions of the site, are minimized. The stringer structure is light, and so transport and installation are facilitated. The document EP 1 524 383 proposes to assemble a stair step on a post by means of an arm describing an angle adapted to the inclination of the staircase. The fastening means used are screws. In the document FR 2 844 537, the steps of a staircase are fixed to an amount by means of a U-section reinforcing piece fixed on the upright. The end of the step is inserted into the reinforcement piece. Screws are passed through the plane of the march to secure it on the reinforcement piece. These assembly means are however long to implement because of the use of the screws, and are also expensive because of the number of parts used.

It is also known to assemble the steps on the stringers by crimping the lateral end of the steps on the string. C004 B004 EN - Text TQD US 3,283,402 describes an example of crimping the steps, in the form of cylindrical bars, for a ladder on slimes. For this purpose, the section of the end of the bar is reduced. The silt includes an opening, through which the end of the bar is introduced to emerge from the silt. The edges of the end of the bar that emerges from the silt are then rolled and pressed against the silt, solidarisant the bar on the silt. US Pat. No. 2,951,550 describes a similar method of crimping cylindrical bars of ladders on the stringers.

However, the cylindrical bars have several disadvantages. In particular, in use, the cylindrical bars tend to pivot in the opening of the stringers, creating radial forces on the crimping, which is degraded. The bars may then become detached from the stringers, and rotate in the openings. In addition, the surface of the cylindrical bars is slippery for an operator placing his feet on it. This is why non-cylindrical ladder rungs have been proposed. US 5,317,798 discloses an example of ladder with non-cylindrical bars crimped on stringers. Although the forces are reduced by such non-cylindrical bars, the bending forces supported by the bars due to the load are reported in full on the connection with the slimes. This results in a deformation of the opening to use, weakening the connection produced by crimping. Thus, in the case of intensive use of the structure, the connection is no longer reliable, and the bar can disassemble the silt, the risk of causing the fall of the operator. The present invention is intended to overcome the aforementioned drawbacks. A first object of the invention is to provide a walking assembly member on silt increasing the reliability of the connection vis-à-vis the bending forces supported by walking, especially in case of intensive use of the step. C004 B004 EN - Text TQD A second object of the invention is to provide a walking assembly member on limons limiting the rotation of the step relative to the silt. A third object of the invention is to provide an inexpensive streambank assembly member. A fourth object of the invention is to provide a walking assembly member on strings not using screws. A fifth object of the invention is to provide a walking assembly member on loosens facilitating assembly. To this end, according to a first aspect, the invention proposes a device for assembling a step on a support, the device comprising an opening for inserting an end portion of the step, said opening being of section. non-circular, and anti-rotation means of walking on the support. The device thus makes it possible to ensure the connection of the step on the support, even in the case of intensive use. According to the preferred embodiment, the anti-rotation means comprise an anti-rotation finger projecting from a front face, and two abutments projecting from the front face defining a housing for the support. Thus, the device mounted on a silt provided with an opening makes it possible to postpone part of the forces beyond the opening of the silt, reducing the risk of deformation of the opening of the silt. Advantageously, wherein the opening is of square section, adapted to the square section of the heart of the step, so as to prevent rotation of the step in the opening. Preferably, the rear face further comprises a groove for inserting a leaf of the step, the opening for the insertion of a portion of the step. Thus, rotation of the step relative to the device is blocked by both the non-circular section opening and the insertion of the step sheet into the groove. The anti-rotation finger is advantageously aligned in a vertical direction with a central point of the opening, the two stops being placed on either side of the opening in the horizontal direction, favoring the distribution of forces beyond the opening of the silt. C004 B004 EN - TQD text According to a second aspect, the invention relates to a height access means structure comprising a stringer and an assembled step on the stringer by means of the device for assembling a step on a strut. support as described above, the step comprising a portion inserted into the opening of the device and in a silt opening. According to the preferred embodiment, the step comprises a heart and leaves, the leaves being removed from the heart on an extreme portion of the step, the heart being inserted into the opening of the device and the opening of the loam, the heart being otherwise notched on the silt, ensuring the locking in translation of the step relative to the silt. According to another embodiment, the step comprises a hollow core and sheets, a reinforcing tube being inserted into the core and being narrowed on an extreme portion, said end portion of the reinforcing tube. Thus, the step can be cut to the right, without step of notching of the leaves, the reinforcing tube ensuring the connection on the silt. Preferably, the step is crimped on the silt, further reinforcing the locking in translation.

Other objects and advantages of the invention will become apparent in the light of the description given hereinafter with reference to the appended drawings in which: FIG. 1 is a perspective view of a ladder comprising a flight of steps assembled on two strings by means of an assembly device, and provided with hubcaps in an extended position; Figure 2 is a perspective view similar to that of Figure 1, wherein the scale is devoid of hubcaps; Figure 3 is a view of the scale of Figure 1, in a folded position; Figure 4 is a rear view of the assembly device; Figure 5 is a side view of the assembly device; Figure 6 is a front view of the assembly device; Figure 7 is an exploded detail view in rear perspective of the assembly device, a step and a slime;

C004 B004 EN - Text TQD Figure 8 is an exploded detail view in front perspective of the assembly device, a step and a slime; Figure 9 is a side detail view of a slime on which a step is assembled by means of the device; Figure 10 is a sectional view of Figure 9 along section line X-X; Figure 11 is a sectional view similar to Figure 10, according to one embodiment; Figure 12 is a variant of Figure 11; Figure 13 is a sectional view similar to Figure 10 according to another embodiment. In Figure 1 is shown a scale 1, and more particularly a double scale single plane of rise. It will be understood, however, that the following may be applicable to other height access means structures 1 with steps, such as stepladders, steps, and even stairs. It is a scale 1 which will find a particular application as a scale of site, allowing an operator to work at height. The components of scale 1 are preferably made of aluminum or aluminum alloy. They can also be made of steel. The scale 1 comprises two lateral stringers 2, in the form of a tube of rectangular section, and defining the rise plane of the scale 1. The two stringers 2 are symmetrical to one another with respect to a plane. Each silt 2 comprises two portions 3, 4 straight lines, namely a first portion 3 of greater length than the second portion 4, and which form between them an angle in the plane of symmetry. The scale 1 is called flared, that is to say that the distance between the lower ends of the silts 2, on the first part 3 of the stringers, is greater than the distance between the upper ends 6 of the stringers 2, on the second portion 5 of the slimes. More specifically, the first portions 3 are brought closer to each other at their upper end 6 forming an angle greater than that formed by the second portions 4. The scale 1 further comprises two feet 7 defining the plane of support of the scale 1, each foot 7 being pivotally mounted on a stringer 2. For this purpose, each foot 7 comprises at one end 6 upper C004 B004 FR - Text TQD a piece 8 of articulation in the form of a bean, solidary of the foot 7 and pivotally mounted on the stringer 2 at the junction between the first portion 3 and the second portion 4. The feet 7 are also flared, the distance between their lower ends 9 being greater than the distance at their upper ends. The flared shape of the scale 1 given by the stringers 2 and the feet 7 offer greater stability at the scale 1 placed on the ground. The lower ends of the stringers 2 and the lower ends 9 of the feet 7 may further be provided with pads II, limiting slippage on the ground, and further increasing the stability of the ladder 1. The ladder 1 comprises a platform 12, pivotally mounted between the two stringers 2 and resting on a transverse bar between the two feet 7. The scale 1 can then take two positions: a deployed position said auto-stable (Figure 1), wherein the feet 7 are away from the silt 2, the platform 12 then resting on the crossbar between the two feet 7 so as to be substantially parallel to the ground; a folded position (Figure 2), wherein the feet 7 are brought against the stringers 2, so that the feet 7 are substantially parallel to the stringers 2, the platform 12 is then pushed by the bar between the two feet 7 so as to be substantially aligned with the silt 2. The folded position in particular facilitates the storage and transport of the scale 1 to the place where it must be deployed for use. The deployed position is said to be self-stable because with the feet 7, the scale 1 does not require the proximity of a wall on which the scale would support to hold in balance and can be used.

A flight of steps 13, more precisely a flight of four steps 13, is assembled on the two strings 2. By the flared shape of the ladder 1, the steps 13 are each of different length, the first step 13, it is that is to say, the first step 13 starting from the lower ends of the stringers 2, being longer than the last step 13. C004 B004 EN - TQD text Each step 13 comprises a core 14 of non-symmetrical section of revolution. More specifically, the core 14 is in the form of a longitudinal tube whose hollow section is not circular. For example, according to the preferred embodiment which is that of the figures, the core 14 of the step 13 has a substantially square section with rounded corners. However, the core section 14 may be of any polygonal shape, for example triangular, rectangular or hexagonal, or of ovoid shape. According to the preferred embodiment, the step 13 also comprises two sheets 15, 16 extending in two transverse directions from the core 14. A first sheet 15, called a small sheet, extends from a first face 17 of the section square of the heart 14, substantially perpendicular to said face 17, its free end being bent. The second sheet 16, said large sheet, has a transverse dimension greater than the small sheet 15. The large sheet 16 extends in a direction opposite to the small sheet 15, since a second face 18 of the square section of the core 14, adjacent to the first face 17, forming a non-right angle with the second face 18. In order to limit the bending forces of the large sheet 16, a reinforcing wing 19 connects the large sheet 16 to a third face 20 of the core 14 13. Thus, the heart 14 and the sheets 15, 16 form a support surface for the feet of an operator. The sheets 15, 16 may be provided with ridges, so as to limit slippage of the operator.

Advantageously, on its two end portions 21, each step is devoid of sheets 15, 16. Indeed, the sheets 15, 16 are removed for example by notching from each of the ends 22 of the step to a predetermined length, so as to leave the heart 14 bare on said length. Despite the flared shape of the silt 2, the leaves 15, 16 can be cut at right angles to the core 14, as will be seen later. Each sheet 15, 16 is assembled on a slime 2 by means of an assembly device 23. The assembly device 23 is in the form of a generally ovoid part, on which a front face 24 and a rear face 24 are defined. C004 B004 EN - TQD text The part 23 comprises an opening 26 from one side to another, of non-circular section, corresponding in complementary manner to the section of the core 14 of the step 13. Thus, for example, as illustrated in the figures, the opening 26 is of square section with rounded corners.

According to the preferred embodiment which is that of the figures, on the rear face, the part 23 comprises two grooves 27, 28 complementary to the leaves 15, 16 of the step 13, extending from the opening 26. first groove 27 extending in one direction from a first edge 29 of the opening 26, complementary to the small sheet 15, and a second groove 28 extends from a second edge 30 of the section of the opening 26 complementary to the large sheet 16. A third groove 31 is also provided to be complementary to the wing 19 of reinforcement.

On the front face 24, the part 23 comprises means 32 anti-rotation, namely a lug 33, called anti-rotation finger, and two stops 34, 35. For the sake of understanding, it defines in the plane of the faces of the part a vertical direction perpendicular to a horizontal direction The anti-rotation finger 33, preferably circular in section, is projecting on the front face 24. For this purpose, a central point 36 is defined on the opening 26, for example the centroid of the section of the opening 26. The finger 33 is then placed in such a way that it is aligned vertically with the central point 36 of the opening. the opening 26. The piece 23 further comprises two stops 34, 35 projecting on the front face 24, defining a housing for a silt 2. More specifically, the two stops 34, 35 are placed on either side of the opening 26, in the horizontal direction. Each abutment 34, 35 thus has a plane 37, 38 substantially flat vertical, forming an angle substantially equal to 90 ° with the front face 24. The planes 37, 38 of the two abutments 34, 35 are vis-à-vis, at a distance substantially equal to the width of a slime. The second groove 28, complementary to the large sheet 16, being larger than the first groove 27, complementary to the small sheet 15, the part 23 has a larger dimension C004 B004 EN - Text TQD important side of the second groove 28 , so that the abutment 35 placed on this side may be of vertical dimension greater than the other abutment 34. The part 23 of the assembly device is advantageously made by casting aluminum die casting, so as to obtain a light piece, of a thickness between the front face and the rear face of for example between 5 and 10 mm, and advantageously 7.7 mm, with a good surface condition, and to minimize the jointing planes so as to avoid an additional step of deburring. However, the part 23 can also be made by molding a thermoplastic material. The two extreme portions 21 of the step 13 being each attached to a slime 2 in an identical manner, it will simply be described here the assembly of an extreme portion 21 of the step 13 on a slime 2, it being understood that the second portion 21 extreme is mounted on a second silt 2 in a similar way. Steps 13 are cut from bars 6m long, for example by sawing or punching, choosing for each step 13 the length adapted to its position between the two flared 2 slats. On its two extreme portions 21, the core 14 of the step 13 is then stripped sheets 15, 16 by sawing or punching for example. The piece 23 of the assembly device is then attached to the step 13. More specifically, the rear face of the piece 23 is applied against the cut edge 39 of the sheets 15, 16, which are inserted into the grooves 27, 28 corresponding supplements. The core 14 then passes into the opening 26, and emerges on the side of the front face 24 of the piece 23. The piece 23 is then placed against a slime 2. For this purpose, the slime 2 is provided on a wall 40 before an opening 41 of non-circular section substantially identical to that of the opening 26 of the part 23, complementary to the core 14 of the step 13, and a bore 42 corresponding to the finger 33 anti-rotation of the part 23. The portion 43 of the core 14 of the emergent step 13 of the piece 23 is inserted into the opening 41 of the stringer 2, then the front face 24 of the piece 23 is applied against the front wall 40 of the stringer 2, so that it is C004 6004 FR - Text TQD that the anti-rotation finger 33 enters the bore 42 and that the silt 2 is placed in the housing between the two planes 37, 38 stops 34, 35, the slime 2 then being clamped by the stops 34 , 35. An extreme portion 44 of the core 14 is then also emerging from the silt 2, on the side of one by The edges 46 of the end of the emerging portion 44 of the core 14 are then rolled against the rear wall 45 of the silt 2, ensuring the crimping of the core 14 of the step 13 on the silt 2. part 23 is advantageously locked in translation on the stringer 2. According to the embodiment in which the core 14 is stripped sheets 15, 16 on the extreme portions 21 of the step 13, the core 14 of the step 13 can be notched on the silt 2, so that the translation of the core 14 in the opening 41 of the silt 2 is blocked (Figures 11 and 12). For example, the core 14 can be notched on three levels (Figure 11), namely on two levels against the two faces of the front wall 40, and against the face of the rear wall 45 opposite the crimping. A fourth notch can be made against the rear face of the part 23 of the assembly device. For this purpose, a tool is for example inserted into the hollow core 14 by the emergent portion 44 of the silt 2, and deforms the core 14 locally 2 to 3 mm against the faces of the walls 40, 45 of the silt 2 and against the face 23. For example, the core 14 is deformed at four points of notching distributed at 90 ° to each other.

According to a particular embodiment (FIG. 13), the leaves 15, 16 are not cut off from the heart 14, so that the step 13 is cut straight at the same time on the heart 14 and the leaves 15, 16. A tube 49 reinforcement, non-circular section, is then inserted into the hollow core 14, so that an end portion 50 of the reinforcing tube 49 emerges from the step 13. In practice, the reinforcing tube 49 is through, and emerges on either side of the step 13. The end portion 50 of the reinforcing tube 49 is narrowed, forming a shoulder 51 at the section change. The shoulder 51 is brought in abutment against the rear face of the part 23 of the assembly device, the end portion 50 of the reinforcing tube 49 passing through the opening 26 of the part 23 and the opening 41 of the string 2. An additional groove 52 is then provided on the rear face of the part 23 in which the edge of the core 14 is inserted. The end 53 of the reinforcing tube 49 is then rolled against the wall 45. back of the silt 2, blocking the translation of the step 13 on the stringer 2.The part 23 of the assembly device is then locked between the crimping against the rear face 45 of the stringer 2 on the one hand, and the edges of the sheets 15 , 16 of the step 13 notched or the shoulder 51 of the tube 49 reinforcement on the other hand. A hubcap 47 in the form of a plug can also be inserted into the hollow core 14 of the step 13, against the silt 2, to hide and protect the crimping and prevent external elements from being introduced into the hollow core 14 of the step 13 and which could accelerate the degradation of the step 13. The second extreme portion 21 of the step 13 is mounted on a second stringer 2 in the same way, by means of a part 23 of the device for the symmetrical assembly. The assembly of the step 13 on the stringer 2 by means of the assembly device 23 described in particular makes it possible to limit the phenomenon of deformation of the opening 41 of the stringer 2 due to an intensive use of the step 13.

Indeed, as already mentioned in the introduction, the forces experienced during the walk 13 in use result in a moment reported on the connection with the silt 2, so that the opening 41 of the silt 2 can to deform, which on the one hand degrades the crimping so that the connection between the step 13 and the silt 2 is no longer ensured, and on the other hand causes the rotation of the heart 14 of the step 13 in the opening The piece 23 of the assembly device not only makes it possible to mount a step 13 having a core 14 of non-circular section on the stringer 2, which in itself limits the rotation phenomenon mentioned, but also makes it possible to distribute the forces of the moment beyond the opening 41 of the stringer 2. In fact, the rotation of the step 13 on the stringer 2 is blocked by the stops 34, 35 and the finger 33 antirotation, so that the efforts are distributed both on the hole 42 and on the sides of the silt 2. C004 B004 EN - Text TQ Thus, one obtains a double effect of the blocking of the rotation of the step 13, both thanks to the non-circular section, and to the anti-rotation means 32 on the front face 24 of the part 23. The insertion leaves 15, 16 of the step 13 in the grooves 27, 28 provides additional locking in rotation of the step 13 on the stringers 2.The assembly of the step 13 on the stringers 2 then has increased safety, and is particularly suitable in the case of intensive use. The piece 23 may also facilitate the cutting operations of the steps 13. Indeed, as already mentioned above, the stringers 2 being flared, the edges 39 of the sheets 15, 16 must in principle be cut to fit the angle of the silt. However, by inserting the sheets 15, 16 in the grooves 27, 28 of the part 23, it is no longer necessary to cut precisely the edges 39 of the sheets 15, 16, which can even be cut at right angles to the heart 14, the part 23 can absorb at least part of the games. The assembly on the stringers 2 has here been described. However, the piece 23 can be used for assembling the step 13 on any support.

For example, the part 23 may optionally be used for mounting on a wall. For this purpose, in addition to an opening 41 of non-circular section and a hole 42 respectively for the core 14 of the step 13 and the finger 33 anti-rotation of the piece 23, it will be necessary to provide on the wall two complementary cutouts of the abutments 34, 35, in which the two abutments 34, 35 are inserted. The part 23 of the device for the assembly of the step 13 on the stringers 2 makes it possible to connect the step 23 on the silt 2 at a lower cost for increased security.

Indeed, no hardware is needed, which in addition to reducing costs significantly simplifies assembly. Part 23 which can be made of die-cast aluminum at an advantageous cost price does not require additional processing steps. C004 B004 EN - Text TQD The device 23 for assembling a step 13 on a stringer 2 can be put in place on the foldable height access means structures, the device 23 does not interfere with the folded position of the structure. The assembly is easy, by interlocking the step 13 on the part 23 of the device, then by interlocking the part 23 on the stringer 2, a simple crimping operation solidarisant all. In addition, the crimping does not resume all the forces due to the rotation, crimping is not a critical operation for assembly, further facilitating assembly.

C004 B004 EN - TQD text

Claims (9)

  1. REVENDICATIONS1. Device (23) for assembling a step (13) on a support, the device (23) comprising an opening (26) for insertion of an extreme portion (21) of the step (13), said opening (26) being of non-circular section, and means (32) anti-rotation of the step (13) on the support.
  2. 2. Device (23) for assembling a step (13) on a support according to claim 1, wherein the anti-rotation means (32) comprises a finger (33) anti-rotation projecting on one face ( 24), and two stops (34, 35) projecting from the front face (24) defining a housing for the support.
  3. 3. Device (23) for assembling a step (13) on a support according to claim 1 or 2, wherein the opening (26) is of square section.
  4. 4. Device (23) for assembling a step (13) on a support according to one of claims 1 to 3, wherein the rear face (25) further comprises a groove (27, 28, 31). to insert a leaf of the step, the opening (26) for inserting a portion of the step (13).
  5. 5. Device (23) for assembling a step (13) on a support according to one of claims 2 to 4, wherein the anti-rotation finger (33) is aligned in a vertical direction with a point ( 36) of the opening (26), the two stops (34, 35) being placed on either side of the opening (26) in the horizontal direction.
  6. 6. Structure (1) of height access means comprising a stringer (2) and a step (13) assembled on the stringer (2) by means of the device (23) for assembling a step (13) on a support according to one of claims 1 to 5, the step (13) comprising a portion inserted into the opening (26) of the device (23) and in an opening (41) of the slime.
  7. The height access means structure (1) according to claim 6, wherein the step (13) comprises a core (14) and sheets (15, 16), the sheets (15, 16) being removed from the heart (14) on an extreme portion (21) of the step (13), the heart (14) being inserted into the opening (26) of the device (23) and the opening (41) of the silt (2), the core (14) being otherwise notched on the silt (2).
  8. 8. Structure (1) means for access to height according to claim 6, wherein the step comprises a core (14) hollow and leaves (15, 16), a tube (49) of reinforcement being inserted into the heart (14) and being recessed on an extreme portion (50), said end portion (50) of the reinforcing tube (49).
  9. 9. Structure (1) of access means in height according to one of claims 6 to 8, wherein the step (13) is crimped on the stringer (2). C004 B004 EN - TQD text
FR1005164A 2010-12-29 2010-12-29 Device for assembling a market on a support Active FR2970017B1 (en)

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US3283402A (en) * 1963-08-23 1966-11-08 White Metal Rolling & Stamping Methods for fabricating lightweight metal ladders
FR2100520A1 (en) * 1971-10-29 1972-03-24 Chevant Claude
FR2589515A1 (en) * 1985-10-31 1987-05-07 Alufort Sa Improvements to metal stepladders
US5317798A (en) * 1991-03-13 1994-06-07 Featherlite Industries Ltd. Method of manufacturing box ladders
FR2844537A1 (en) * 2002-09-18 2004-03-19 Tubesca Connection arrangement for interconnecting steps to uprights for forming stairs or footbridge, includes slides accommodated in uprights and having threaded holes that receive screws to fix step reinforcement to upright
EP1524383A2 (en) * 2003-10-16 2005-04-20 Sidney Gibson Stair bracket system and method
EP2184419A1 (en) * 2008-11-10 2010-05-12 Giovanni Spatti Prefabricated structure for stairwells, lifts, goods lifts and similar, and assembly method of a prefabricated structure

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2951550A (en) * 1958-11-05 1960-09-06 Howard B Rich Ladder construction
US3042140A (en) * 1960-04-15 1962-07-03 Putnam Rolling Ladder Co Inc Stepladders
US3283402A (en) * 1963-08-23 1966-11-08 White Metal Rolling & Stamping Methods for fabricating lightweight metal ladders
FR2100520A1 (en) * 1971-10-29 1972-03-24 Chevant Claude
FR2589515A1 (en) * 1985-10-31 1987-05-07 Alufort Sa Improvements to metal stepladders
US5317798A (en) * 1991-03-13 1994-06-07 Featherlite Industries Ltd. Method of manufacturing box ladders
FR2844537A1 (en) * 2002-09-18 2004-03-19 Tubesca Connection arrangement for interconnecting steps to uprights for forming stairs or footbridge, includes slides accommodated in uprights and having threaded holes that receive screws to fix step reinforcement to upright
EP1524383A2 (en) * 2003-10-16 2005-04-20 Sidney Gibson Stair bracket system and method
EP2184419A1 (en) * 2008-11-10 2010-05-12 Giovanni Spatti Prefabricated structure for stairwells, lifts, goods lifts and similar, and assembly method of a prefabricated structure

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