GB2505735A

GB2505735A - Modular access system for use over stairs

Info

Publication number: GB2505735A
Application number: GB201303497A
Authority: GB
Inventors: Curtiss Richley Craig
Original assignee: CRAIG ENGINEERING TOTAL ACCESS SYSTEMS Ltd
Current assignee: CRAIG ENGINEERING TOTAL ACCESS SYSTEMS Ltd
Priority date: 2012-09-10
Filing date: 2013-02-27
Publication date: 2014-03-12
Anticipated expiration: 2033-02-27
Also published as: GB201303497D0; GB2505735B; GB201216113D0

Abstract

A modular access system (100, figure 2) having a three dimensional structure 105 with a planar surface 115. The surface is adapted to support a user, and the structure is suitable for locating over and resting upon steps 16 of stairs. There is a clamping member 120 which is removably fastened to the structure and clamps on to a first handrail of the stairs. There may be a second clamping member for clamping a second handrail parallel to the first handrail. A bracing member (600, figure 8B) may connect the two clamping members. The modular access system may have an articulated portion and may include transport wheels (130A, 130B, figure 11C). The platform may have a closed position where it can support a user, and an open position where a user can pass through the system along the stairs. A second invention relates to a clamping member, and a third invention relates to a structure suitable for use with an access system.

Description

MODULAR ACCESS SYSTEM

Field of the Invention

[0001] The present invention relates to a modular access system. More particularly, the present invention relates to a modular access system for safely accessing elevated areas adjacent stairs, escalators, moving walkways and the like, such as stairway or walkway soffits and sidewalls, and performing tasks thereat.

Background of the Invention

[0002] Stairwells are a difficult environment in which to perform work, maintenance tasks or the like at height, due to the inherently non-linear surface constituted by the succession of stair steps and the corresponding absence of a large, planar surface area on which to rest a height access system for the purpose, such as a ladder at its simplest.

[0003] Many access systems have been developed over time, to try and mitigate the above problem. Some developments have concentrated on providing a temporary surface area on which to rest a conventional ladder or scaffold, for instance as disclosed in US 7.686.134, US 5.715.910 and USD 621.959. Some other systems have concentrated on providing complete access systems, with a base configuration specifically designed to accommodate the non-linear surface constituted by the succession of stair steps, for instance as disclosed in GB 2070120, GB 2373017, JFO81 00518 and WOl 992000432.

[0004] Most such developments have focused upon providing access systems, typically a platform-like element or a structure bearing the platform, with ever-improved longitudinal stability, i.e. along the direction of the stair steps, and/or better handling characteristics.

[0005] An important disadvantage of all such prior art systems, is that no provision is made for improving their transversal stability, i.e. along the direction across the stair steps, substantially to the same extent as their longitudinal stability. This issue is particularly problematic in wide and/or tall and/or open stairwells, for instance stairwells of mechanical escalators and corridors of moving walkways, which are necessarily wider than the steps themselves in order to accommodate end-to-end step-driving machinery and one or more moving handrails adjacent the steps, and still more so in the case of stairwells with several parallel escalators. When a lateral load is applied to such conventional access systems, particularly at working height, and which load meets or exceeds the lateral load tolerance of the access system merely resting on the steps, there is a risk of precipitating a lateral fall or toppling of the system, harmfully to any operators located thereon.

[0006] A further problem lies in the fact that configurations of stairwells and moving walkways are known vary to a very large, architecturally -driven or -constrained extent. Many conventional access systems offer some degree of modularity to accommodate this variety, particularly for varying their height, and typically take the form of scaffold-like structures composed of many interconnected modular two-dimensional elements, such as ladders, poles and the like. The structural integrity of this approach, however, then relies essentially on the strength and suitability of the connections between individual members, resulting in an access system which is potentially only as structurally sound as its weakest member interconnection.

[0007] When this disadvantage is considered in combination with the lateral load problem noted above, there is clearly a need for an improved modular access system, which at least mitigates the above problems.

Summary of the Invention

[0008] According to a first aspect there of the present invention, there is provided a modular access system comprising at least one three-dimensional structure comprising a substantially planar surface adapted to support a user in use, wherein the at least one structure is suitable for locating over and resting upon steps of stairs having at least one handrail located substantially adjacent thereto, and at least one clamping member, removably fastened to the at least one structure and adapted to removably clamp the at least one handrail.

[0009] This configuration advantageously accommodates, or offsets, load transfers on the planar surface during working or maintenance tasks, as much by the longitudinal resting points of the structure on the steps as by the lateral clamping point provided by the clamping member, resulting in a more stable and safe system. As the system comprises only two elements in its simplest embodiment, the system has a particularly strong structural integrity, having only the connection between the structure and the clamping member as its weakest link, and which is subjected to less mechanical stress than the structure resting points in ordinary use.

[0010] Preferably, the system comprises a second clamping member, removably fastened to the at least one structure and adapted to removably clamp the at least one handrail, in order to improve its lateral stability still further.

[0011] In the case of stairs, escalators, travelators or moving walkways with two parallel handrails, then the system may alternatively comprise a second clamping member, again removably fastened to the at least one structure, but now adapted to removably clamp the second handrail parallel to the at least one handrail, for distributing the lateral load-accommodating anchoring points on either side of the system and, again, improve its lateral stability.

[0012] The above embodiment may be further strengthened by removably fastening the clamping members to one another with a bracing member transversal to the stairs. As stairwell widths can vary to a large extent, the bracing member is preferably adjustable in length between the clamping members, to accommodate various stairwell widths. In a preferred embodiment of this variant, the bracing member may be removably fastened to the at least one structure.

[0013] Preferably, at least a portion of the planar surface is operably configured, in a closed position, as a platform apt to support the user and, in an open position, as a through passage allowing the user to pass through the system in either direction. The portion may for instance be hinged about a remaining portion of the surface, thus able to pivot about the hinge between the two positions. This configuration advantageously allows a user to easily and safely pass through the system along the stairs, in either direction, after the system is fastened in place.

[0014] Preferably, the at least one structure comprises first and second sections configured to rest upon respective stair steps, and a third intermediate section securing the first and second sections to one another and to which the surface is secured. The first section may for instance be configured substantially as a door frame, resting upon a step in a substantially vertical orientation, whilst the second section may be configured substantially as a spacer frame resting upon another step higher along the stairway, likewise in a substantially vertical orientation, the third section comprising two parallel, lateral struts rigidly linking the first and second sections.

[0015] Preferably, the system further comprises at least one fall -preventing member constituting at least one side of the structure facing downstairs. The system may optionally comprise one or more further fall -preventing members forming further respective sides of the structure, disposed substantially transverse and/or parallel to the at least one member facing downstairs. Each such member may consist of a substantially planar surface disposed perpendicularly to the substantially planar surface adapted to support a user in use or, in an alternative embodiment, of a plurality of bars disposed in a ladder-like configuration.

[0016] Preferably, the system further comprises means removably fastening the or each clamping member to the at least one structure, which are articulated for accommodating the pitch of the stairs. For instance, a mounting bracket embodying the fastening means may be configured to rotate relative to the clamping member, along an arc co-planar with the handrail, to a position providing a substantially vertical or horizontal mating point for the structure.

[0017] Preferably, the means removably fastening the or each clamping member to the at least one structure, is further adapted to accommodate variations in height between stair steps and handrails, either due to the individual character of stairwells designs or as a result of a handrail irregular design, or even in case parallel handrails are asymmetrical relative to the steps. For instance, one or more longitudinal through slots may be incorporated in one or more vertical struts or members of the structure. A mounting bracket can be passed through the slot, and slide along the slot substantially vertically relative to the step surface before locking the clamping member, in order to accommodate such height variations.

[0018] According to another aspect of the present invention, there is provided a modular access system comprising a first three-dimensional structure suitable for locating over and resting upon steps of stairs having at least one handrail located substantially adjacent thereto, at least a second three-dimensional structure comprising a substantially planar surface adapted to support a user in use, suitable for resting upon and releasably locking on a top portion of the first structure, and at least one clamping member, removably fastened to the first structure and adapted to removably clamp the at least one handrail.

[0019] This configuration provides substantially the same advantages as the above configuration in terms of accommodating load transfers, but advantageously improves the modularity of the system, by providing a first structure as a base framework on which to locate and lock one or more further three-dimensional structures, to better accommodate varying stairwell configurations, particularly their height characteristics.

[0020] Preferably, this system again further comprises a second clamping member, however now removably fastened to the second structure and adapted to removably clamp the at least one handrail.

[0021] In the case of stairs or escalators with two parallel handrails, then again the system may alternatively further comprise a second clamping member, removably fastened to the first structure and adapted to removably clamp a second handrail parallel to the at least one handrail. In this context, more preferably still, the system may comprise a further two clamping members, each removably fastened to the second structure and adapted to removably clamp respective handrails of the parallel pair thereof, at respective positions upstairs of the at least one and the second clamping members. This later configuration advantageously anchors the entire system to parallel handrails at both ends of the system, distributing the lateral load-accommodating anchoring points at all four corners of the system and providing optimal lateral stability.

[0022] The above embodiment may again be further strengthened by removably fastening the or each pair of opposed clamping members to one another with a bracing member transversal to the stairs, optionally adjustable in length between the clamping members, providing still better lateral stability and structural integrity. In a preferred embodiment of this variant, the bracing member downstairs of the system may be removably fastened to the first structure, and the bracing member upstairs of the system may be removably fastened to the second structure, providing maximal lateral stability and structural integrity.

[0023] Preferably, the first structure comprises first and second sections configured to rest upon respective stair steps, and a third intermediate section securing the first and second sections to one another, for instance as described above.

[0024] Preferably, the second structure is substantially cuboid and open, and comprises fall -preventing members constituting two opposed sides of the second structure and a third side of the second structure facing downstairs, with the members for instance as described above.

[0025] In case the stairwell soffit or sidewall is still higher than may be reached with the above embodiments, then the system may further comprise a third three-dimensional structure having a substantially planar surface adapted to support a user in use, suitable for resting upon and releasably locking on a top portion of the second structure. Preferably, the third structure is substantially cuboid and open, and comprises tall -preventing members constituting four sides of the third structure, with the members for instance as described above.

[0026] Preferably, wheels are secured to respective underside portions of io the second structure, and corresponding top portions of the first structure are configured with wheel tracks for guiding the wheels therein and with locking means to lock the wheels therein. This configuration advantageously tacilitates locating the second structure onto the first structure and their locking assembly.

With reference to the embodiment comprising a third three-dimensional structure, substantially the same configuration may be adapted between the second and third structures, with the same advantage.

[0027] Preferably, at least a portion of the or each substantially planar surface is operably contigured, in a closed position, as a platform apt to support the user and, in an open position, as a through passage allowing the user to pass through the system. Again, this configuration advantageously allows a user to easily and safely pass through the system, namely through the first and second structures, along the stairs, in either direction, after the system is fastened in place. With reference to the embodiment having the third structure resting upon and locked to the second structure, this same contiguration advantageously allows a user to easily and safely climb from the second structure through the surface of the third structure up to the higher third structure.

[0028] According to a further aspect of the present invention, there is provided a clamping member tor use with any modular access system substantially as described above.

[0029] Preferably, the clamping member comprises at least one elongate member longitudinally profiled to fit about a handrail, and means to vary a distance between the at least one member and a mounting bracket for removably fastening the elongate member and the means to a structure. Alternatively, the clamping member may comprise two elongate members respectively profiled, longitudinally, to fit about a handrail and configured in opposition to one another, means to vary a distance between the two members, and a mounting bracket for removably fastening the two members and the means to a structure. A portion of the member or each of the two opposed members may be substantially C-shaped.

[0030] Preferably, the means to vary a distance comprises at least one user -operated wheel mated to a screw and bolt combination, arranged transversally to the two opposed members. In a preferred embodiment, the means to vary a distance comprises two user -operated wheel mated to respective screw and bolt combinations, disposed parallel to one another and disposed transversally to the two opposed members.

[0031] Preferably, the mounting bracket is configured to rotate relative to the at least two opposed members, along an arc co-planar with the handrail, for accommodating the pitch of the stairs, with the same advantage as previously described.

[0032] According to yet another aspect of the present invention, there is provided a three-dimensional structure for use with any modular access system substantially as described above.

[0033] According to still another aspect of the present invention, there is provided a kit of parts for a modular access system, comprising at least one three-dimensional structure for use with any modular access system substantially as described above, and at least one clamping member structure for use with any modular access system substantially as described above.

[0034] According to one more another aspect of the present invention, there is provided a method of providing access to an area located substantially above steps or another non-linear surface having at least one handrail located substantially adjacent thereto, the method comprising the steps of locating at least one three-dimensional structure comprising a surface adapted to support a user in use, over the steps or surface, such that the structure rests thereon, fastening at least one clamping member to the at least one structure, and clamping the member to the at least one handrail.

[0035] Preferably, the method further comprises fastening a second clamping member to the at least one structure and clamping the second member to the at least one handrail.

[0036] Preferably, the method further comprises fastening a second clamping member to the at least one structure and clamping the second member to a second handrail parallel to the at least one handrail.

[0037] Preferably, the method further comprises resting a second three-dimensional structure upon the at least one three-dimensional structure located on the steps or surface, and locking the second three-dimensional structure on a top portion of the first structure.

[0038] Other aspects are as set out in the claims herein.

Brief Description of the Drawings

[0039] For a better understanding of the invention and to show how the same may be carried into effect, there will now be described by way of example only, specific embodiments, methods and processes according to the present invention with reference to the accompanying drawings in which: Figure 1 is a perspective view of a modular access system according to the invention, including a clamping member and a three-dimensional structure, located in a stairwell.

Figure 2A is a perspective view of a first embodiment of a modular access system according to the invention, including a clamping member and a three-dimensional structure.

Figure 2B is a perspective view of a second embodiment of a modular access system according to the invention, including a clamping member and a three-dimensional structure with a folding section and transport wheels.

Figure 2C is a perspective view of the modular access system of Figure 2B, wherein the section is folded.

Figure 2D is a perspective view of the modular access system of Figures 2B and 2C, shown resting on the transport wheels.

Figure 3A is an end view of a first embodiment of a clamping member as shown in Figures ito 2D, for a first handrail type.

Figure 3B is an end view of a second embodiment of a clamping member, suitable for the first handrail type of Figures i to 2D.

Figure 30 is an end view of a third embodiment of a clamping member, suitable, for a second handrail type commonly found with escalators.

Figure 4A is an end view of the clamping member of Figure 3A, fitted to the first handrail type.

Figure 4B is an end view of the clamping member of Figure 3B, fitted to the first handrail type.

Figure 40 is an end view of the clamping member of Figure 30, fitted to the second handrail type.

Figure 5A is a side elevation of the clamping member of Figures 3A and 4A, with a rotating mounting bracket, fitted to the first handrail type.

Figure 5B is a side elevation of the clamping member of Figures 3B and 4B, with a rotating mounting bracket, fitted to the first handrail type.

Figure 6A is an end view of two clamping members as shown in Figures 3B and 4B, fastened to a transversal bracing bar.

Figure 6B is an end view of two clamping members as shown in Figures 3C and 4C, fastened to a same transversal bracing bar as shown in Figure GA.

Figure 7A is a top view of the configuration shown in Figure 6A.

Figure 7B is a top view of the configuration shown in Figure 6B.

Figure 8A is a perspective view of the configuration shown in Figure GB and 7B, with user operated wheels arranged asymmetrically.

Figure 8B is a perspective view of the configuration shown in Figure 6B and 7B, with user operated wheels arranged symmetrically.

Figure 80 is a perspective view of an alternative embodiment of the configuration shown in Figure 8B.

Figure 3D is a perspective view of yet another alternative embodiment of the configuration shown in Figure 8B.

Figure 9A is a perspective view of a first three dimensional structure according to a further embodiment the invention.

Figure 9B is a perspective view of another first three dimensional structure according to yet another embodiment the invention, with a folding section and transport wheels, shown in deployed form for use.

Figure 9C is a perspective view of the first three dimensional structure of Figure 90 shown in stowed form for transport.

Figure 1OA is a perspective view of a second three dimensional structure according to a further embodiment the invention, with a configurable surface shown in a closed position.

Figure lOB shows the second three dimensional structure of Figure 1OA with the configurable surface shown in an open position.

Figure hA is a perspective view of a third three dimensional structure according to a further embodiment the invention, with a configurable surface shown in a closed position.

Figure 11B shows the third three dimensional structure of Figure hA with the configurable surface shown in an open position.

Figure 110 is a perspective view of a modular access system according to the invention, wherein the the first three dimensional structure of Figures 9B and and the second and third three dimensional structures of Figures 1 OA to 11 B are nested for transport.

Figure 12A is a perspective view of a first modular access system assembled in a stairwell with the three dimensional structures of Figures 9A and 1OA to 11 B, and a plurality of clamping members and transversal bracing bars as shown in Figure8B.

Figure 12B is a perspective view of a second modular access system assembled in a stairwell with the three dimensional structures of Figures 9B and 1OA to 11 B, and a plurality of clamping members and transversal bracing bars as shown in Figure 8B.

Figure 120 is a front view of a first or second modular access system of Figures 12A or 12B, illustrating a configuration of clamping members and transversal bracing bars as shown in Figure 8D in use with non -level handrails.

Figure 13 is a perspective view of the first modular access system of Figure 12A, assembled in an escalator stairwell with a plurality of clamping members and transversal bracing bars as shown in Figure 8B.

Figure 14 is a perspective view of a third modular access system, assembled in an escalator stairwell with the three dimensional structures of Figures 9A to 11 B, and a plurality of clamping members and transversal bracing bars as shown in Figure 8B.

Figure 15 is a perspective view of a fourth modular access system, assembled in a double escalator stairwell with the three dimensional structures of Figures 9A to 11 B, and a plurality of clamping members and transversal bracing bars as shown in 8B.

Figure 16 is a perspective view of a fifth modular access system, assembled in a double escalator stairwell substantially as shown in Figure 15, but with a fourth three dimensional structure according to a further embodiment the invention.

Detailed Description of the Embodiments

[0040] There will now be described by way of example a specific mode contemplated by the inventors. In the following description numerous specific details are set forth in order to provide a thorough understanding. It will be apparent however, to one skilled in the art, that the present invention may be practiced without limitation to these specific details. In other instances, well known methods and structures have not been described in detail so as not to unnecessarily obscure the description. Throughout the drawings and the description, like components, members and features shall be designated with like references, for ease of understanding.

[0041] With reference to Figures 1 to 16, a stairwell 10 is a difficult environment in which to perform work, maintenance tasks or the like at height, typically at soffits or upper portions 12 of the sidewalls 14, due to the inherently non-linear surface constituted by the succession of stair steps 16 and the corresponding absence of a large, planar surface area on which to rest a height access system for the purpose. A stairwell 10 suitable for working the invention thereat includes at least one handrail 18, as a safety measure for the stair users to grip during their ascent or descent.

[0042] With reference to Figures 1 and 2, a first embodiment of a modular access system 100 is shown, which comprises a three-dimensional structure 105 having first, second and third sections 110, 112, 114.

[0043] The first section 110 is a rectangle made from tubing with a substantially square section in a rigid material, for instance steel or, as the environment of the stairwell 100 may prescribe, another rigid material with alternative properties such as non-conducting, non-corroding and the like. The second section 112 is also an open rectangle, substantially with the same material properties as the first section 110 but of a substantially smaller dimension. The third section 114 comprises two parallel, lateral struts 114A, 11 4B, each strut having ends respectively fastened to the first and second sections 110, 112 at a right angle relative thereto.

[0044] In use, the first section 110 and the second section 112 rest upon respective steps 16, each in a substantially vertical orientation, whereby the struts 114A, 114B have a substantially horizontal orientation, parallel to the threads of the steps 16.

[0045] A substantially planar surface 115 is also fastened to the struts 11 4A, 11 4B and, optionally and as shown in Figure 2 with a dotted line, may also be fastened to a top portion 117 of the second section 112. A clamping member 120 is removably fastened to the three-dimensional structure 105 by a portion of the first structure 110 configured as a mounting bracket 125, and removably clamps the handrail 18 adjacent the structure 105.

[0046] In the embodiment shown, the portion of the first structure 110 configured as a mounting bracket 125 further includes a through aperture 126 implemented as a longitudinal slot in the tubing of the first structure 110, substantially at the level of the clamping member 120. This configuration provides an amount of travel to the clamping member within the slot 126 along a substantially vertical direction, relative to the first structure 110. Advantageously, this configuration thus allows adjustment of the modular access system 100 to the varying heights of handrails, relative to steps 16, to be found in many different stairways [0047] In an alternative embodiment of the access system 100 shown in Figures 2B to 2D, the first section 110 of the access system 100 may optionally comprise two substantially co-planar portions 11 OA, 11 OB, wherein the first portion 11OA is a top portion permanently secured to the surface 115 and the struts 114A, 114B, and wherein the second portion 11OB is a lower portion articulated relative to the first portion substantially at the level of each strut 114A, 114B. The articulation may be provided as hinges 116A, 116B, configuring the lower portion 11 OB to rotate relative to the first portion 11 OA between a stowage position substantially parallel to and underneath the surface 115, thus substantially perpendicular to the first portion 11OA, and a working position substantially parallel to and co-planar with the first portion 11OA, thus substantially perpendicular to the surface 115.

[0048] Abutting plates 11 8A, 11 8B are respectively provided adjacent the hinges 116A, 116B, to prevent rotation of the lower portion 11DB beyond the plane of the top portion 11OA in the working position. Wheels 120A, 12DB are respectively provided substantially adjacent the hinges 116A, 116B, and to the outside of the struts 1 14A, 1 14B, for facilitating the handling and transport of the access system 100 in the stowage position.

[0049] Three embodiments of the clamping member 120 are shown by way of example, with reference now to Figures 3A to 5B. Each embodiment is shown on its own in Figures 3A to 30, fitted to a handrail 18 in Figures 4A to 40, and fitted to an inclined handrail with an optional rotatable mounting bracket in Figures 5A and 5B.

[0050] In the embodiments shown in Figures 1 to 20, the clamping member 120 corresponds to an embodiment shown in further detail in Figures 3A and 4A. At its simplest the clamping member 120 comprises an elongate member 300 longitudinally profiled to fit about a handrail 18, and a user -operated wheel 301 mated to a screw 302 and bolt 303 combination, arranged transversally to the elongate member. A portion 304 of the elongate member 300 is longitudinally profiled with a C shape, which corresponds substantially to the outer curvature of the surface 181 of a substantially tubular handrail 18. At least a portion of the inner surface of the elongate member 300 facing the handrail surface 181 is preferably coated or covered with a non-slip material 305, for instance rubber or neoprene.

[0051] In use, the single member 300 is located between the handrail 18 and the sidewall 14, and the wheel 301 is then operated to reduce a distance between the single member 300 and the mounting bracket 125 and, therefore, the structure 105, until the single member 300, handrail 18 and at least the first section 110 of the structure 105 are in contact, thus wherein the single member 300 and the mounting bracket 125 of the first section 110 combine to form a vice -like clamp about the handrail 18.

[0052] Alternatively, with reference now to Figures 3B and 4B, the clamping member 120 may comprise two elongate members 300A, 300B, each having a portion 304 with substantially the same C -shape longitudinal profiling, wherein the members are configured in opposition relative to one another, so that their respective profiled portions 304 face one another and form a vice -like clamp apt to accommodate the handrail 18 therein.

[0053] Remaining portions 306 of the two elongate members 300A, 300B above the profiled portions 304 are substantially planar and parallel to one another. A top section 307 of the remaining portion 306 of a first 300B of the two elongate members 300A, 300B constitutes the mounting bracket 125. A top section 308 of the remaining portion 306 of the second elongate member 300A forms a shallow angle relative to the opposed planar portion 306 and constitutes a biasing section 308 when the two elongate members 300A, 300B are brought closer to one another. A user -operated wheel 301 mated to a screw 302 and bolt 303 combination is again arranged transversally to the elongate members 300A, 300B.

[0054] In use, the opposed members 300A, 300B are located on either side of the handrail 18, and the wheel 301 is then operated to reduce a distance between the members 300A, 300B, therefore between the first member 300A and the mounting bracket 125 to which the second member 300B is permanently secured, thus between the first member 300A and the structure 105 to which the mounting bracket is removably secured, until both members 300A, 3006, the handrail 18 and at least the first section 110 of the structure 105 are in contact.

The bias section 308 of the first member 300A further biases the C-shaped profiled portion 304 of the first elongate member 300A towards the opposed C-shaped profiled portion 304 of the second elongate member 300B and further strengthens the clamping action exerted by both members upon the rail 18.

[0055] Alternatively still, with reference now to Figures 3C and 40, the clamping member 120 may comprise substantially the same configuration of dual-members 300A, 300B as described hereinbefore, however wherein the C -shape longitudinal profiling of each portion 304 is elongated with intermediate top and bottom flat spots 308, for accommodating typical profiles of handrails 333 of escalators. Two user -operated wheels 301A, 301 B mated to respective screw 302 and bolt 303 combinations may be provided in this embodiment, in order to strengthen the clamping action of the clamping member. The two wheels 301A, 301 B and their respective screw and bolt combinations are again arranged transversally to the elongate members 300A, 300B, and substantially parallel to one another.

[0056] Stairs can vary quite widely in pitch, i.e. the angle they, and their associated handrail or handrails 18 form, relative to horizontal step threads 16.

Accordingly, in an alternative embodiment shown in Figures 5A and SB, a rotating mounting bracket 400 is provided, which is configured to rotate relative to the at least two opposed members 300A, 300B, along an arc 401 substantially co-planar with the handrail 18, for accommodating the pitch of the stairs.

[0057] In use, the clamping member 120 is releasably fastened to the handrail 18 as previously described, then the rotating bracket 400 is pivoted about the clamping member 120 along the arc 401 until it achieves a substantially horizontal or vertical position, respectively parallel or perpendicular to the step threads 16, as may be required to attach the structure 105 thereto, for the surface thereof to be disposed substantially horizontal.

[0058] Depending on the intended use, work parameters, health and safety requirements and/or stairwell characteristics, it may be desired to impart still further structural strength and rigidity to the access system 100 and/or to its anchoring points at the clamp or clamps 120. Accordingly, with reference now to Figures 6A to 8D, a transversal bracing bar 600 may be provided, to which clamping members 120 located on either side of the access system 100 and in transversal alignment relative thereto, are releasably secured.

[0059] In preferred embodiments, shown in the Figures, the bracing bar 600 comprises an elongate member 602 made of a rigid material, for instance steel, of a length corresponding substantially to at least the interval separating parallel handrails 18. A first end 603 of the elongate member 602 is configured to engage or be otherwise fastened to the mounting bracket section 307 of a first of the two opposed clamping members 120, for instance with a conventional fastener such as a combination of nuts and bolts. The other, opposed end 604 of the elongate member 602 adjacent the second clamping members 120 is substantially rectilinear and adapted to slide within a dependent mounting arm 605, which is configured substantially according to the first end 603 in size and in orientation relative to the clamping members 120.

[0060] The dependent mounting arm 605 thus comprises, at a first end, an aperture 606 wherein the elongate member end 603 slides and, at a second end 607, is configured to engage or be otherwise fastened to the mounting bracket section 307 of the second clamping members 120, for instance again with a conventional fastener such as a combination of nuts and bolts. Means to lock the elongate member end 603 in place within the aperture 606 are provided substantially adjacent the aperture 606. With reference to Figures 8C and 8D, such locking means may be embodied as a hand-operated wheel 301 mated with a screw passing through both an aperture in the arm 605 and a corresponding longitudinal slot 608 within the member 602 adjacent the end 603, wherein the screw engages a bolt located within the bar 602 opposite the slot. This configuration provides both convenience of use and rapidity of adjustment.

[0061] Depending on the space available between the handrail 18 and the adjacent stairwell sidewall 14, with reference to Figures 8A and 8B, the user operated wheels 301 may be located, respectively, either asymmetrically with all the wheels 301 of the pair of clamping members 120 facing a same direction, or symmetrically with wheels 301 facing each other across the steps 16, as circumstances dictate.

[0062] With reference to Figure 9A now, another embodiment of a three dimensional structure 900 is shown. Features of the structure 900 correspond substantially to those of the structure shown and described with reference to Figure 2, in that it comprises a first section 110 configured to rest upon a first stair step 16, a second section 112 configured to rest upon a second, higher stair step 16, and a third intermediate section securing the first and second sections 110, 112 to one another, consisting of parallel struts 11 4A, 11 4B.

[0063] In this embodiment, however, the structure 900 does not include a surface 115, and each strut 114A, 114B is configured with a respective lateral wheel track 902A, 902B accessible from a respective slot 901A, 901 B in the top portion of the strut. Slats 126 are implemented in the first section 110, in order to allow movement of the clamps 120 therein for accommodating height variations across the width of the structure, as previously described. The structure 900 forms a base module for an access system 100 according to the invention, consisting of several three dimensional structures stacked atop another in order to reach particularly high soffits or sidewall portions 12.

[0064] An alternative embodiment 980 of the first structure 900 is shown in Figures 9B and 9C and combines, usefully, features of the embodiment of Figures 2B to 2D with the first structure 900, wherein the first section 110 of the first structure 980 comprises two substantially co-planar portions 11 OA, 11 OB, the first portion 11OA forming a permanent portion of the frame of the first structure 980 with the struts 1 14A, 114B, and the second portion 11OB being a lower portion articulated relative to the first portion 11 OA substantially at the level of each strut 114A, 114B. The articulation may again be provided as hinges 116A, 11 6B, configuring the lower portion 11 OB to rotate relative to the first portion 11 OA between a stowage position substantially parallel to and underneath the struts 114A, 114B, thus substantially perpendicular to the first portion 11OA, and a working position substantially parallel to and co-planar with the first portion 11 OA, thus substantially perpendicular to the struts 114A, 114B.

[0065] Abutting plates 118A, 118B are again respectively provided adjacent the hinges 11 6A, 11 6B, to prevent rotation of the lower portion 11 OB beyond the plane of the top portion 11 OA in the working position. Wheels 1 30A, 130B are again respectively provided substantially adjacent the hinges 116A, 11 6B, and to the outside of the struts 11 4A, 1 14B, for facilitating the handling and transport of the first three dimensional structure 980 in its stowed position.

[0066] With reference now to Figures 1 OA to 110, further embodiments of three dimensional structures are described hereafter. A second three dimensional structure 910 includes a configurable surface 115 consisting of a first fixed portion 11 5A and a second portion 11 SB hinged 912 about one of the two lateral struts 114A, whereby the hinged portion 115B is operable, in use, between a closed position in which, in combination with the fixed portion liSA, it forms a platform apt to support the user, and an open position in which it provides a through passage allowing the user to pass through the system 100 in either direction.

[0067] The second structure 910 is substantially cuboid and open, and comprises fall -preventing members 914 constituting two opposed sides of the second structure and a third side of the second structure facing downstairs. Fall -preventing members 914 constituting the third side of the second structure facing downstairs may advantageously be configured as a ladder 920.

[0068] The second structure 910 is suitable for resting upon and releasably locking on a top portion of the first structure 900. Accordingly, wheels 916 are secured to respective underside portions of the second structure 910, which enter into the guiding tracks 902A, 902B of the underlying first structure via their respective slots 901A, 901B. The tracks and slots of the first structure 900 and the wheels 916 of the second structure are so configured that, once all four wheels 916 are inserted in the underlying tracks 902A, 902B, the second structure 910 is locked in place on the first structure 900 by at least gravity.

Locking pins may be implemented for still more secure locking.

[0069] In accordance with the above principle, the two topmost fall -preventing members 914 of the lateral (opposed) sides of the second structure are configured substantially like the struts 114A, 114B of the base module 900, therefore again with respective lateral wheel track 902A, 902B accessible from a respective slot 901A, 901 B in the top portion of the members.

[0070] Slots 126 are again implemented in the second structure 910, in order to allow movement of the clamps 120 therein for accommodating height variations across the width of the structure, as previously described.

[0071] A third three dimensional structure 950 is envisaged, which is configured substantially like the three dimensional structure 910, however wherein fall -preventing members 914 constitute four sides of the structure, and the topmost fall -preventing members 914 of the lateral (opposed) sides do not include any tracks 902A, 902B. The second structure 910 may therefore be thought of as an intermediate module 910, and the third structure 950 may therefore be thought of as a top module 910.

[0072] The substantially cuboid aspect of the second and third structures 910, 950 advantageously permits the nesting of a third structure 950 within a second structure 910 atop a wheeled embodiment of the first structure 980, subject to relevant dimensioning of the features of the second and third structures described therein in an embodiment of the modular system of the invention shown in Figure 11C. In the embodiment shown, the second structure 910 is engaged with the first structure 980, with its wheels 916 releasably locked within the tracks 902A, 902B as previously described. The third structure 950, in this embodiment having smaller general dimensions than the second structure, is upended and rested by gravity within the opening defined by the top aspect of the second structure 910. This embodiment is particularly useful both for minimising the storage requirements of the system when not in use, and its handling between its storage location and the place of intended use.

[0073] With reference now to Figures 12A to 16, further embodiments of access systems assembled from base, intermediate and top modules 900, 910, 950 and including clamping members 120 with bracing bars 600 substantially as described herein, are described hereafter.

[0074] Figure 12A is a perspective view of a modular access system assembled in a stairwell with base, intermediate and top modules 900, 910, 950, two pairs of clamping members 120 fastened to respective transversal bracing bars 600 and located respectively in front and at the back of the access system, which clamp parallel handrails 18, 120 of conventional stairs.

[0075] Figure 12B is a perspective view of a modular access system assembled in a stairwell with base, intermediate and top modules 990, 910, 950, two pairs of clamping members 120 fastened to respective transversal bracing bars 600 and located respectively in front and at the back of the access system, which clamp parallel handrails 18, 120 of conventional stairs.

[0076] Figure 12C shows the modular access system of Figure 12A in a stairwell having two handrails 18 which are disposed asymmetrically relative to the stair steps 16. In this case, the slots 126 in the vertical struts of, respectively, the first module 900 for the front or downstairs' bracing arrangement and the second module 910 for the rear or upstairs' bracing arrangement, allow each transversal bracing arrangement to be cantilevered therein at an angle, relative to the plane defined by the substantially horizontal stair steps 16, which accommodates the asymmetry of the handrails 18, whereby the parallel handrails 18 are still clamped as required.

[0077] Figure 13 is a perspective view of a modular access system assembled in a stairwell with base, intermediate and top modules 900, 910, 950, two pairs of clamping members 120 fastened to respective transversal bracing bars 600 and located respectively in front and at the back of the access system, which clamp parallel handrails 18, 120 of a mechanical escalator 1300.

[0078] Figure 14 is a perspective view of a modular access system assembled in a stairwell, which combines two sets of base, intermediate and top modules 900, 910, 950. Three pairs of clamping members 120 are fastened to respective transversal bracing bars 600 and located respectively in front and at the back of the combined access system, as well as at an position intermediate the two assemblies. The clamping members 120 again clamp parallel handrails 18, 120 of a mechanical escalator 1300.

[0079] Figure 15 is a perspective view of a modular access system assembled in a stairwell, wherein two sets of base, intermediate and top modules 900, 910, 950 are installed in respective stairwells of parallel mechanical escalators 1300. Two pairs of clamping members 120 are fastened to respective transversal bracing bars 600 and located respectively in front and at the back of each set of modules, and this configuration essentially amounts to a juxtaposition of systems as shown in Figure 13.

[0080] Figure 16 is a perspective view of a modular access system assembled in a stairwell substantially as shown in Figure 15, however wherein a fourth type of three dimensional structure 1600 effectively bridges the juxtaposed sets of base, intermediate and top modules 900, 910, 950. The three dimensional structure 1600 comprises a planar surface consisting of two hinged portions 11SB, each located above an intermediate module 910, fixed portions liSA adjacent the hinged portions 11 5B, and an intermediate fixed portion 1601 there between. Two pairs of clamping members 120 are again fastened to respective transversal bracing bars 600 and located respectively in front and at the back of each set of modules, as shown in Figure 15.

Claims

Claims 1. A modular access system comprising: at least one three-dimensional structure comprising a substantially planar surface adapted to support a user in use, wherein the at least one structure is suitable for locating over and resting upon steps of stairs having at least one handrail located substantially adjacent thereto; and at least one clamping member, removably fastened to the at least one structure and adapted to removably clamp the at least one handrail.
2. A modular access system according to claim 1, comprising a second clamping member, removably fastened to the at least one structure and adapted to removably clamp the at least one handrail.
3. A modular access system according to claim 1, comprising a second clamping member, removably fastened to the at least one structure and adapted to removably clamp a second handrail parallel to the at least one handrail.
4. A modular access system according to claim 3, wherein the clamping members are removably fastened to one another by a bracing member transversal to the stairs.
5. A modular access system according to claim 4, wherein the bracing member is adjustable in length between the clamping members.
6. A modular access system according to claim 4 or 5, wherein the bracing member is removably fastened to the at least one structure.
7. A modular access system according to any of claims 1 to 6, wherein at least a portion of the surface is operably configured, in a closed position, as a platform apt to support the user and, in an open position, as a through passage allowing the user to pass through the system along the stairway in either direction.
8. A modular access system according to any of claims 1 to 7, wherein the at least one structure comprises first and second sections configured to rest upon respective stair steps, and a third intermediate section securing the first and second sections to one another and to which the surface is secured.
9. A modular access system according to claim 8, wherein the first section comprises two substantially co-planar portions sub-sections, one lower portion of which is articulated relative to the upper portion and configured to rotate between a stowage position substantially parallel to and underneath the substantially planar surface and a working position substantially perpendicular to the substantially planar surface.
10. A modular access system according to claim 9, further comprising transport wheels located adjacent the first section.
11. A modular access system according to any of claims 1 to 10, further comprising at least one fall -preventing member constituting at least a first side of the structure facing downstairs.
12. A modular access system according to claim 11, comprising at least a further fall -preventing member constituting another side of the structure transverse to the first side.
13. A modular access system according to any of claims 1 to 12, further comprising means removably fastening the or each clamping member to the at least one structure, wherein the means is articulated for accommodating the pitch of the stairs.
14. A modular access system according to any of claims 1 to 13, wherein the means removably fastening the or each clamping member to the at least one structure, is further adapted to accommodate the height of the hand rail relative to the stair steps.
15. A modular access system comprising: a first three-dimensional structure suitable for locating over and resting upon steps of stairs having at least one handrail located substantially adjacent thereto; at least a second three-dimensional structure comprising a substantially planar surface adapted to support a user in use, suitable for resting upon and releasably lacking on a top portion of the first structure; and at least one clamping member, removably fastened to the first structure and adapted to removably clamp the at least one handrail.
16. A modular access system according to claim 15, further comprising a second clamping member, removably fastened to the second structure and adapted to removably clamp the at least one handrail.
17. A modular access system according to claim 15, further comprising a second clamping member, removably fastened to the first structure and adapted to removably clamp a second handrail parallel to the at least one handrail.
18. A modular access system according to claim 17, comprising a further two clamping members, each removably fastened to the second structure and adapted to removably clamp respective handrails of the parallel pair thereof, at respective positions upstairs of the at least one and the second clamping members.
19. A modular access system according to claim 17 or 18, wherein the or each pair of clamping members is fastened to one another by a bracing member transversal to the stairs.
20. A modular access system according to claim 19, wherein the transversal bracing member is adjustable in length.
21. A modular access system according to any of claims 15 to 20, wherein the first structure comprises first and second sections configured to rest upon respective stair steps, and a third intermediate section securing the first and second sections to one another.
22. A modular access system according to claim 21, wherein the first section comprises two substantially co-planar portions sub-sections, one lower portion of which is articulated relative to the upper portion and configured to rotate between a stowage position substantially parallel to and underneath the substantially planar surface and a working position substantially perpendicular to the substantially planar surface.
23. A modular access system according to claim 22, further comprising transport wheels located adjacent the first section.
24. A modular access system according to any of claims 15 to 23, wherein the second structure is substantially cuboid and open, and comprises at least one fall -preventing member constituting at least a first side of the second structure facing downstairs.
25. A modular access system according to claim 24, comprising at least a further fall -preventing member constituting another side of the structure transverse to the first side.
26. A modular access system according to any of claims 15 to 25, comprising a third three-dimensional structure having a substantially planar surface adapted to support a user in use, suitable for resting upon and releasably locking on a top portion of the second structure.
27. A modular access system according to claim 26, wherein the third structure is substantially cuboid and open, and comprises fall -preventing members constituting four sides of the third structure.
28. A modular access system according to any of claims 15 to 27, wherein wheels are secured to respective underside portions of the second structure, and corresponding top portions of the first structure are configured with wheel tracks for guiding the wheels therein and with locking means to lock the wheels therein.
29. A modular access system according to claim 28 when depending on claim 19 or 20, wherein wheels are secured to respective underside portions of the third structure, and corresponding top portions of the second structure are configured with wheel tracks for guiding the wheels therein and with locking means to lock the wheels therein.
30. A modular access system according to any of claims 15 to 29, wherein at least a portion of the or each substantially planar surface is operably configured, in a closed position, as a platform apt to support the user and, in an open position, as a through passage allowing the user to pass through the system.
31. A clamping member for use with the modular access system according to any of claims 1 to 30.
32. A clamping member according to claim 31 comprising at least one elongate member longitudinally profiled to fit about a handrail, and means to vary a distance between the at least one member and a mounting bracket for removably fastening the elongate member and the means to a structure.
33. A clamping member according to claim 32, comprising two elongate members respectively profiled, longitudinally, to fit about a handrail and configured in opposition to one another, means to vary a distance between the two members, and a mounting bracket for removably fastening the two members and the means to a structure.
34. A clamping member according to any of claims 31 to 33, wherein a portion of each of the at least two opposed members is substantially C-shaped.
35. A clamping member according to any of claim 31 to 34, wherein the means to vary a distance comprises at least one user -operated wheel mated to a screw and bolt combination, arranged transversally to the two opposed members.
36. A clamping member according to claim 35, comprising a second user -operated wheel mated to a second screw and bolt combination, disposed parallel to the at least one user -operated wheel mated to the screw and bolt combination.
37. A clamping member according to any of claims 32 to 36, wherein the mounting bracket is configured to rotate relative to the at least two opposed members, along an arc co-planar with the handrail, for accommodating the pitch of the stairs.
38. A structure for use with the modular access system according to any of claims 1 to 30.
39. A kit of parts for a modular access system, comprising: at least one three-dimensional structure according to claim 38; and at least one clamping member according to any of claims 31 to 37.
40. A method of providing access to an area located substantially above steps or another non-linear surface having at least one handrail located substantially adjacent thereto, the method comprising the steps of locating at least one three-dimensional structure comprising a surface adapted to support a user in use, over the steps or surface, such that the structure rests thereon; fastening at least one clamping member to the at least one structure; and clamping the member to the at least one handrail.
41. A method according to 40, further comprising locating fastening a second clamping member to the at least one structure; and clamping the second member to the at least one handrail.
42. A method according to 40, further comprising locating fastening a second clamping member to the at least one structure; and clamping the second member to a second handrail parallel to the at least one handrail.
43. A method according to any of claims 40 to 42, further comprising resting a second three-dimensional structure upon the at least one three-dimensional structure located on the steps or surface; and locking the second three-dimensional structure on a top portion of the first structure.
44. A modular access system substantially as described herein, in association with and as shown in the accompanying drawings.
45. A clamping member substantially as described herein, in association with and as shown in the accompanying drawings.
46. A three-dimensional structure for a modular access system substantially as described herein, in association with and as shown in the accompanying drawings.