GB2615553A

GB2615553A - Screen system and structure

Info

Publication number: GB2615553A
Application number: GB2201754.5A
Authority: GB
Inventors: Murrell Alan; Korn Michael; Hough Christopher; Beswick Logan; Slater Edward; Santos Margarida
Original assignee: Korn Wall Ltd
Current assignee: Korn Wall Ltd
Priority date: 2022-02-10
Filing date: 2022-02-10
Publication date: 2023-08-16
Also published as: GB202210985D0; GB2615616A; GB202201754D0; GB2615616B

Abstract

A screen system 500 comprises a first and second screen structures 550, 553, wherein each structure comprises a panel element 544a, 544b attached to at least one support element 501a-b, 503 a-b and wherein the panel and support elements are attached to and are rollable about a rotor 516a, 516b which rotate about a longitudinal axis to provide extension and retraction thereof along a direction generally perpendicular to the longitudinal axis. Rotor 516b is moveable relative to the rotor 516a. Further provided is a screen structure with a panel element attached to at least one support element, wherein both elements are attached and rollable about a rotor rotating about a longitudinal axis to provide extension and retraction thereof along a direction generally perpendicular to the longitudinal axis. The structure comprises a base portion 575 engageable with and supporting the rotor in an upright orientation relative to the surface over which the structure is deployed, and wherein the base portion is operable between a first moveable configuration where the relative position of the rotor across the surface is moveable, and a second parked configuration where the movement of the rotor is inhibited.

Description

Screen system and structure

Field of the invention

The present disclosure relates to a screen system and structure.

Background

Bistable extendable members, also referred to as "bistable reeled composites" (BRCs) and/or "split tube extendable members" ("STEMs") and/or "split tubes" and/or "extendible sheet members" and/or "bistable composite elements", are elements which are configurable between two stable forms: a rigid longitudinally extending structure, and a compact coil of flat rolled up material. In the compact coiled/rolled up form, a bistable extendable member can be rolled up/wound/coiled about a first axis. In the rigid longitudinally extending form, the bistable extendable member longitudinally extends straight along a second axis which is perpendicular to the first axis.

Bistability in a bistable extendable member arises as a result of the manipulation of the Poisson's ratio and isotropy in the various layers of material making up the bistable extendable member. Bistable extendable members can be made from fibre-reinforced composite materials, for example glass fibres in a thermoplastic matrix, which are consolidated under conditions of elevated temperature and pressure.

Due to their mechanical properties of being extendable and retractable again into a wound or rolled up state, bistable extendable members can be useful in retractable structures such as retractable panels, screens, walls, dividers and/or partitions, such as 25 those described in W02019201948A1 and EP3251562B1.

W08808620 describes an elongate element in the form of a longitudinally split tube. US6217975B1 describes an extendable sheet member which is configurable between first and second states. US6602574B1 describes an extendible, coilable member which is reversibly configurable between a coiled form and an extended form. W09962811 describes a compound member formed from at least two extendible, coilable members, each of which is reversibly configurable between a coiled form and an extended form. US6256938B1 describes an elongate element in the form of a longitudinally split tube -2 -which is arranged to be progressively flattened and wound about an axis extending transversely to the longitudinal extent of the tube to form a coil.

Portable screen structures can be used to temporarily divide areas in a room, for example in a healthcare setting to reduce the risk of cross-infection from e.g., coronavirus. However, it can be difficult to create temporary screen structures that can divide more complex spaces that involve bends and corners, for example around a patient's bed.

The present disclosure seeks to alleviate, at least to a certain degree, the problems and/or address at least to a certain extent, the difficulties associated with the prior art.

Summary of the invention

Aspects of the invention are as set out in the independent claims and optional features 15 are set out in the dependent claims. Aspects of the invention may be provided in conjunction with each other and features of one aspect may be applied to other aspects.

In a first aspect there is provided a screen system for deployment over a surface such as a floor. The screen system comprises a first screen structure (which may be attached to a wall) and a second screen structure (which may be moveable across a surface such as a floor), wherein each screen structure comprises a panel element attached to at least one support element, wherein the at least one support element and the panel element are attached to and configured to be rollable about a rotor configured to rotate about a longitudinal axis to provide for extension and retraction thereof along a direction generally perpendicular to the longitudinal axis. The rotor of the second screen structure is configured to be moveable relative to the rotor of the first screen structure.

The least one support element of the first screen structure may be pivotably coupled to the second screen structure, such that the angle of the panel element of the first screen structure relative to the rotor of the second screen structure is adjustable. The support element may be pivotably coupled to an elongate support post/support structure or spine element having a longitudinal axis parallel to longitudinal axis of rotor. -3 -

The second screen structure may comprise a base portion configured to be engageable with a surface over which the second screen structure is deployed or is to be deployed to support the rotor and therefore panel in an upright orientation generally perpendicular to the surface.

It will be understood that in the context of the present disclosure, there is a complex balance between the need of the base portion to provide stability to the rotor but also to provide manoeuvrability and minimise footprint and trip hazard.

The base portion may be operable between a first moveable configuration and a second parked configuration, wherein in the first moveable configuration the relative position of the rotor of the second screen structure across the surface is moveable relative to the rotor of the first screen structure, but wherein in the second parked configuration movement of the rotor of the second screen structure across the surface relative to the rotor of the first screen structure is inhibited.

It will be understood that when movement of the rotor of the second screen structure across the surface relative to the rotor of the first screen structure being inhibited is described, this does not mean that the rotor of the second screen structure cannot rotate, instead it means that movement of the rotor of the second screen structure across the surface is inhibited.

It will also be understood that in examples where each screen structure comprises a housing enclosing the rotor and any panel and support elements wound onto the rotor, that in the first moveable configuration the relative position of the housing of the second screen structure across the surface is moveable relative to the housing of the first screen structure, but wherein in the second parked configuration movement of the housing of the second screen structure across the surface relative to the housing of the first screen structure is inhibited.

The second screen structure may comprise an actuating mechanism, operable by retraction or extension of the at least one support element and the panel element, to move the base portion between the first moveable configuration and the second parked -4 -configuration. In some examples the actuating mechanism may be activated by rotation of the rotor of the second screen structure. However, in other examples the second screen structure comprises a handle element for extending and retracting the at least one support element and the panel element upon application of a force to the handle 5 element, wherein at least a portion of the handle element is configured to engage the actuating mechanism to move the base portion between the first moveable configuration and the second parked configuration, such that when the handle element bears against the actuating mechanism the base portion is held in the first moveable configuration, and when the handle element no longer bears against the actuating mechanism the base 10 portion is in the second parked configuration.

The second screen structure may comprise a guide element configured to receive at least a portion of the handle element and configured to guide at least a portion of the handle element towards the actuating mechanism. The at least a portion of the handle element being guided may be a protrusion configured to be received by a recess or channel in the guide element to guide retraction of the at least one support element and the panel element.

The handle element of the second screen structure may comprise an engagement portion configured to be guided by the guide element and configured to engage the locking mechanism. It will also be understood that the handle element may comprise additional components such as a flap extending the length of the handled element designed to increase the privacy provided by the handle element when the panel is in an extended position The screen system may further comprise a locking mechanism to removably secure the handle element of the second screen structure to the base portion, wherein the locking mechanism is actuatable by a lock actuating means. The lock actuating means may, for example, be located on the handle element of the second screen structure and/or on the base portion, for example the base portion may comprise a pedal to operate the locking mechanism to release the handle element. Additionally, or alternatively the locking mechanism may be actuatable in response to a force being applied above a selected threshold level of force (e.g., a jerking motion). -5 -

The base portion may comprise rolling means and a shroud element, and wherein in the first moveable configuration the at least one shroud element is raised relative to the rolling means to permit movement of the rolling means on the surface, and wherein in the second parked position the at least one shroud element is lowered relative to the rolling means to engage the surface and inhibit movement of the rolling means on the surface.

The actuating mechanism may comprise a lever arm, and wherein at least a portion of the handle element is configured to engage the lever arm to actuate the actuating mechanism to lift or lower the shroud element of the base portion relative to the rolling means. The lever arm may be coupled to the shroud via an eccentric pivot. The actuating mechanism may comprise a bell crank.

Additionally, or alternatively, the actuating mechanism may comprise a hydraulic piston 15 and wherein at least a portion of the handle element is configured to engage a hydraulic actuator in a first axis to actuate the hydraulic piston to lift or lower the shroud element of the base portion relative to the rolling means in a direction transverse to the first axis.

The handle element of the second screen structure has a longitudinal axis, and the handle element of the second screen structure may comprise a base element configured to support the handle element, and thereby the panel element, in a generally perpendicular orientation relative to the surface, and parallel to the longitudinal axis of the rotor of the second screen structure.

In some examples, as the handle element of the second screen structure bears against the actuating mechanism to move the base portion between the second parked position and the first moveable position, the base element coupled to the handle element is raised off of the surface by the base portion.

The base element of the handle element of the second screen structure may comprise rolling means configured to permit relative movement of the base element of the handle element of the second screen structure relative to the surface. However, it will also be appreciated that the base element may be a static base without rolling means. -6 -

The first screen structure may comprise at least one hinge arrangement coupled to the rotor of the first screen structure (e.g., indirectly via a frame/spine element supporting the rotor) and configured to provide for the rotor of the first screen structure to pivot about a second longitudinal axis arranged generally parallel to the longitudinal axis of the rotor of the second screen structure. The at least one hinge may be biased so that it is configured to return to a neutral position. This may additional help prevent damage occurring to the support element.

The at least one support element of each screen structure may comprise a bistable extendable member, such as a composite split tube extendable member, each having a longitudinal edge arranged generally perpendicular to the first longitudinal axis and to which the panel element is attached, each of the at least one bistable extendable members being configurable in a first state in which it is at least partially rolled up about the first longitudinal axis, and a second state in which it is at least partially longitudinally extended along the direction generally perpendicular to the first longitudinal axis.

In another aspect there is provided a screen structure for deployment over a surface. The screen structure comprises a panel element attached to at least one support element, wherein the at least one support element and the panel element are attached to and configured to be rollable about a rotor configured to rotate about a longitudinal axis to provide for extension and retraction thereof along a direction generally perpendicular to the longitudinal axis, and a base portion configured to be engageable with and support the rotor in an upright orientation relative to the surface over which the screen structure is deployed or is to be deployed. The base portion is operable between a first moveable configuration and a second parked configuration, wherein in the first moveable configuration the relative position of the rotor of the screen structure across the surface is moveable, but wherein in the second parked configuration movement of the rotor of the screen structure across the surface is inhibited. The screen structure and base portion may hold the rotor and therefore panel in an upright orientation such that the longitudinal axis is in a direction generally perpendicular to the surface.

The screen structure may further comprise an actuating mechanism, operable by -7 -retraction or extension of the at least one support element and the panel element, to move the base portion between the first moveable configuration and the second parked configuration.

The screen structure may further comprise a handle element for extending and retracting the at least one support element and the panel element upon application of a force to the handle element. At least a portion of the handle element may be configured to engage the actuating mechanism to move the base portion between the first moveable configuration and the second parked configuration, such that when the handle element bears against the actuating mechanism the base portion is held in the first moveable configuration, and when the handle element no longer bears against the actuating mechanism the base portion is in the second parked configuration.

The base portion may comprise a guide element configured to receive at least a portion of the handle element and configured to guide at least a portion of the handle element towards the actuating mechanism. The at least a portion of the handle element being guided may be a protrusion configured to be received by a recess in the guide element to guide retraction of the at least one support element and the panel element.

The screen structure may further comprise a locking mechanism to removably secure the handle element of the second screen structure to the base portion, wherein the locking mechanism is actuatable by a lock actuating means on the handle element of the second screen structure.

The locking means may comprise a lever arm, and wherein the handle element is configured to engage the lever arm to actuate the locking mechanism to lift or lower the shroud element of the base portion relative to the rolling means. The lever arm may be -8 -coupled to the shroud via an eccentric pivot.

The at least one support element may comprise a bistable extendable member, such as a composite split tube extendable member, each having a longitudinal edge arranged generally perpendicular to the first longitudinal axis and to which the panel element is attached, each of the at least one bistable extendable members being configurable in a first state in which it is at least partially rolled up about the first longitudinal axis, and a second state in which it is at least partially longitudinally extended along the direction generally perpendicular to the first longitudinal axis.

In another aspect there is provided a screen system for deployment over a surface. The screen system comprises a first rotor and a second rotor each having respective longitudinal axes, wherein both rotors are coupled to opposite ends of a panel element attached to at least one support element, wherein the at least one support element and the panel element are attached to and configured to be rollable about the rotors to provide for extension and retraction thereof along a direction generally perpendicular to the respective longitudinal axes. The rotor of the second screen structure is configured to be moveable relative to the rotor of the first screen structure.

In some examples, at least one of the rotors is coupled to a base portion configured to be engageable with a surface over which the second screen structure is deployed or is to be deployed to support the rotor and therefore panel in an upright orientation generally perpendicular to the surface. The base portion may be operable between a first moveable configuration and a second parked configuration, wherein in the first moveable configuration the relative position of the rotor of the second screen structure across the surface is moveable relative to the rotor of the first screen structure, but wherein in the second parked configuration movement of the rotor of the second screen structure across the surface relative to the rotor of the first screen structure is inhibited.

Both rotors may be coupled to respective base portions operable between a first moveable configuration and a second parked configuration.

At least one of the rotors may be coupled to at least one hinge arrangement and -9 -configured to provide for the rotor to pivot about a longitudinal axis arranged generally parallel to the longitudinal axis of the rotor.

Drawings Embodiments of the disclosure will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1A shows a perspective view of a bistable extendable member in a partially rolled up state; Figure 1B shows a perspective view of the bistable extendable member of Figure 1A in a fully rolled up state; Figure 10 shows a perspective view of the bistable extendable member of Figure 1A in a fully longitudinally extended state; Figure 2A shows the cross-sectional profile of the bistable extendable member of Figure 1A 15 when it is in a rolled up state, as in Figure 1B; Figure 2B shows the cross-sectional profile of the bistable extendable member of Figure 1A when it is in a longitudinally extended state, as in Figure 10; Figure 3A shows a front view of a screen structure in a fully extended position; Figure 3B shows a front view of the screen structure of Figure 3A in a partially extended 20 position; Figure 4A shows a rear perspective view of a screen structure in a fully extended position; Figure 4B shows a front perspective view of the screen structure of Figure 43 in a partially extended position; Figure 5 shows a perspective view of an example screen system comprising two screen 25 structures; Figure 6 shows a side view of a base portion of the second screen structure of the screen system of Figure 5; Figure 7 shows a side view of a base portion of the second screen structure of the screen system of Figure 5 as the handle element approaches the base portion; Figure 8 shows a perspective view of a base portion of the second screen structure of the screen system of Figure 5; Figure 9 shows a perspective view of a base portion of the second screen structure of the screen system of Figure 5 as the handle element approaches the base portion; Figure 10 shows a perspective view of the underside of a base portion of the second screen 35 structure of the screen system of Figure 5; -10 -Figure 11 shows another perspective of the base portion of the second screen structure of the screen system of Figure 5; Figure 12A shows a perspective view of another example embodiment of a base portion for use for example with the screen system of Figure 5; Figure 12B shows a side view cross-section of the example base portion of Figure 12A; and Figure 13 shows a perspective view of another example embodiment of a screen system.

Specific description

A detailed description of example screen structures comprising a base portion to support the screen structure and provide self-returnability thereto shall now be given. It should be understood that the example base portion described herein is not limited to only being used to support the screen structures described herein and may alternatively be used to equal effect to support different screen structures, for example any screen structure which rolls up (extends/retracts) or which does not roll up and which is fixed. The example base portion described herein could be used to support many different sizes of structures/panels when extended, e.g. a screen structure of around 1-5m wide x 1-5m high when substantially fully extended such as a screen structure of around 3m wide x 2m high.

Figure 1A illustrates an example support 1 which is a bistable extendable member. The bistable extendable member 1 is configurable in a first state in which the bistable extendable member 1 is rolled up (i.e. coiled) about a first axis 2, and a second state in which the bistable extendable member 1 is longitudinally extended along a second axis 3 which is perpendicular to the first axis 2. As shown in Figure 1A, the bistable extendable member 1 can be in both the first state and the second state at the same time when the bistable member is partially coiled up or extended. For example, a first portion 4 of the bistable extendable member 1 can be in the first coiled state, and simultaneously, a second portion 5 of the bistable extendable member can be in the second extended state, with a transition portion 6 between the first portion 4 and the second portion 5. In the examples discussed herein, the bistable extendable member 1 comprises a bistable composite split tube extendable member. However, it is also to be understood that any other bistable extendable member(s) may be employed, such as a non-composite bistable extendable member, or any other bistable reeled composite or bistable split tube extendable member.

Figure 1B shows the bistable extendable member 1 when it is fully in the first state. That is, when the entire length of the bistable extendable member 1 is rolled up about the first axis 2. Conversely, Figure 1C shows the bistable extendable member 1 when it is fully in the second state. That is, when the entire length of the bistable extendable member 1 is longitudinally extended along the second axis 3.

As shown in Figure 2A, when the bistable extendable member 1 is in the first state, in a plane which is normal to the second axis 3, the bistable extendable member 1 has a cross-sectional profile 7 which is substantially flat and straight. This is also shown in Figure 1B. As shown in Figure 2B, when the bistable extendable member 1 is in the second state, in a plane which is normal to the second axis 3, the bistable extendable member 1 has a cross-sectional profile 8 which is C-shaped. That is, when the bistable extendable member 1 is in the second state, it curves upwards at its longitudinal edges.

This is also shown in Figures 1A and 1C.

With reference to Figure 1A, the bistable extendable member 1 is selectively configurable between the first state and the second state. The bistable extendable member 1 can be progressively rolled up by applying a rolling force FR to the first portion 4 to cause an increase in the length of the bistable extendable member 1 which is rolled up to form the first portion 4 and conversely a decrease in the length of the bistable extendable member 1 which is extended to form the second portion 5. Conversely, the bistable extendable member 1 can be progressively longitudinally extended by applying an extending force FE to the first portion 4 to cause an increase in the length of the bistable extendable member 1 which is extended to form the second portion 5 and a decrease in the length of the bistable extendable member 1 which is rolled up to form the first portion 4.

With reference to Figure 1B, when the bistable extendable member 1 is fully in the first state, i.e., when it is fully rolled up, a pulling force FP can be applied to the outwardly facing end 9 of the bistable extendable member 1 in order to initiate the longitudinal extension of the bistable extendable member 1 to form the second portion 5. The extending force FE can then be applied as in Figure 1A to increase the length of the -12 -bistable extendable member 1 which is extended to form the second portion 5, as desired. Similarly, as shown in Figure 10, when the bistable extendable member 1 is fully in the second state, i.e., when it is fully longitudinally extended, a coiling force, FC, can be applied to the end 9 of the bistable extendable member 1 to initiate the rolling up of the bistable extendable member 1 to start forming the first portion 4.

An exemplary application of the bistable extendable member 1 described herein shall now be described, with reference to Figures 3A and 3B, which show an exemplary screen structure 47.

In the screen structure 47, a first bistable extendable member la and a second bistable extendable member 1b (which may hereinafter be referred to collectively as "bistable extendable members 1") are employed as upper and lower members 48a, 48b respectively, of a frame 48. Side members 48c, 48d of the frame 48 are provided by aluminium supports 43a and 43b respectively. A panel 44 comprising a flexible polymer film (though panels of other materials such as other polymers and/or textiles may also be employed) is arranged to hang substantially flat in the plane defined by the frame 48 and may be attached to the upper and lower members 48a, 48b directly, or via one or more zips. The aluminium supports 43a and 43b are each attached to a respective base element 45a, 45b. Supports 43a and 43b and base element 45a, 45b are at least on their own light enough for a user to pick up and move (pick and place') them around, making the structure 47 highly portable and independently movable. One or more handles and/or knobs and/or other protruding elements may be attached to the support 43a or 43b and arranged to protrude therefrom, to make it easier for a user of the screen structure 47 to grip and hold the supports 43a or 43b, to improve the ergonomics of the screen structure 47. A knob 38 is shown on support 43a and could equally be applied to support 43b.

By means of the two states of the bistable extendable members la and lb, the frame 48 and thus also the panel 44 can be progressively rolled up or extended, due to the bistable properties of the bistable extendable members la and 1 b, as described above in relation to the bistable extendable member 1. Figure 3A shows the structure 47 and thus the panel 44 in a fully extended position wherein the bistable extendable members la, lb are fully longitudinally extended, as in Figure 10. Figure 3B shows the structure 47 and -13 -thus the panel 44 in a partially extended position wherein the bistable extendable members la, lb are partially longitudinally extended, as in Figure 1A. Once lifted, a pushing or pulling force can be applied to the support 43a or support 43b to cause the frame 48 and the panel 44 to be retracted/rolled up/closed or extended/pulled out/opened respectively about one or more rotors 16 (not shown in Figs. 1 to 3B but shown in Figs. 4A and 4B). The supports 43a and/or 43b as described herein may be referred to as being 'handle elements' in so far as, amongst other things, they function to allow a user to extend and retract the frame 48 and panel 44 once they have been picked one up, moved it and placed it on the ground in another location so as to extend or retract the frame (i.e. the supports 43a and/or 43b allow a user to extend or retract the frame 48 and panel 44 upon application of a force thereto). In the example shown in Figures 3A and 3B each support 43a, 43b may comprise a respective rotor, or only one of the supports 43a, 43b may comprise a rotor for receiving and rolling the at least one support element 1 and panel 44.

In the example shown in Figures 3A and 3B, the supports 43a, 43b are sized and shaped such that when the structure 47 and the panel 44 are in a substantially fully retracted position (not shown), the supports 43a, 43b will abut one another. Thus, the geometry of the supports 43a, 43b provides that the support 43a may only be positioned and orientated relative to the support 43b in one particular position and orientation, which may be designed to be a desired position and orientation which leaves a leading end portion of the bistable extendable members la, lb slightly extended, to avoid mechanical fastenings (not shown) which attach the leading end of each of the bistable extendable members 1 to the support 43a, from rubbing on the coiled portion 4 (see Figure 1A) of the bistable extendable members 1, thus reducing the likelihood of damage to the bistable extendable members 1.

Figures 4A and 4B show an alternative exemplary screen structure 15 which is mounted to a generally vertical wall 17. It is though envisaged that the screen structure 15 may be mounted to any other surface, such as a generally vertical post, or a piece of furniture. Alternatively, it is also envisaged that the screen structure 15 may be adapted to be freestanding, i.e., not mounted to a surface such as a wall.

-14 -The screen structure 15 is generally similar to the screen structure 47 shown in Figures 3A and 3B, in that it comprises supports in the form of bistable extendable members la and 1 b, and a panel 44. Though, instead of aluminium supports 43a and 43b (as in Figures 3A and 3B), an elongate handle element 14 and a rotor 16 form a frame 18 5 together with the bistable extendable members 1 a, 1 b, inside which the panel 44 is arranged. The elongate handle element 14 and the rotor 16 may be formed of aluminium, or any other suitable metal or other material(s). In the example described herein, the bistable extendable members la, lb comprise bistable composite split tube extendable members, though it is envisaged that any other bistable extendable members may be 10 employed. The handle element 14 is attached to a base element 45.

In the example shown, the handle element 14 comprises a generally straight elongate member having a generally square cross-sectional profile. A pushing or pulling force can be applied to the handle element 14 to cause the bistable extendable members I a, lb and the panel 44 to be retracted/rolled up/closed or extended/pulled out/opened respectively about the rotor 16 about a first longitudinal axis 19 corresponding to the axis of rotation of the rotor 16 (see Figures 5A and 5B).

In some examples the screen structure may also comprise an optional spine element (as shown, for example, in Fig. 11) comprising a generally straight elongate member having a generally rectangular cross-sectional profile, although it will be understood that other cross-sectional profiles such as a circular cross-sectional profile may be used. The spine element may be arranged to provide structural support and stiffness to the screen structure 15. In some examples the spine element may provide a housing for the rotor 516a, 516b and the panel element 544a, 544b rolled upon the rotor 516a, 516. The housing may be elongate to substantially enclose and support the rotor 516a, 516b, with an elongate aperture extending along the longitudinal axis of the rotor 516a, 516b for permitting the panel element 544a, 544b and support element 510a, 510b, 503a, 503b to retract/extend from the rotor 516a, 516b within the housing.

The optional spine element may optionally include one or more channels for slidably receiving one or more other components and/or mechanical fastenings, such as one or more hinge arrangements which at least attach the structure 15 to the generally vertical -15 -wall 17. The spine element may therefore be formed from an aluminium extrusion, for ease of manufacture and assembly. One or more handles and/or knobs and/or other protruding elements may be attached to the handle element 14 and arranged to protrude therefrom, to make it easier for a user of the screen structure 15 to grip and hold the handle element 14, to improve the ergonomics of the screen structure 15.

It is also envisaged that alternative shapes, sizes and configurations of handle elements and spine elements may alternatively be employed in the screen structure 15 other than those which are shown in Figures 4A and 48 and described below.

Figure 5 shows an example screen system 500 of embodiments of the disclosure for deployment over a surface 400. In the example shown, the screen system 500 comprises a first screen structure 550 and a second structure 553, and the surface is a floor. One or each screen structure 550, 553 may be similar and/or share similar functionality with the screen structure of Figs. 4A and 48, with like reference numbers denoting features with the same or similar functionality to those described above.

In the example shown, the first screen structure 550 is coupled to a vertical wall 17, whereas the second screen structure 553 is freestanding and coupled to the end of the 20 panel element 544 of the first screen structure 550 However, in other examples both screen structures 550, 553 may be freestanding.

In the example shown in Fig. 5, the first screen structure 550 comprises a first panel element 544a supported by two support elements, a first split tube extendable member 501a, and a second split tube extendable member 501b, both extending horizontally either side of the central panel element 544a. The first screen structure 550 comprises an elongate frame adapted to hold a first rotor 516a in an orientation generally parallel to the wall 17. The support elements 501a, 501b may be coupled to the frame via respective hinges which may advantageously improve supporting the panel element 544a. The respective hinges may be biased so that they are configured to return to a neutral position. This may additional help prevent damage occurring to the support elements 501a, 501b e.g., from rubbing against the frame.

-16 -The second screen structure 553 similarly comprises a second panel element 544b supported by two support elements, a first split tube extendable member 503a, and a second split tube extendable member 503b, both extending horizontally either side of the central panel element 544b. The panel elements 544a, 544b may comprise a flexible polymer film (though panels of other materials such as other polymers and/or textiles may also be employed) and are arranged to hang substantially flat in the plane defined by the support elements 501a, 501b, 503a, 503b.

The support elements 501a, 501b and the first panel element 544a of the first screen structure 550 are rollable about the first rotor 516a, and the support elements 503a, 503b and the second panel element 544b of the second screen structure 553 are rollable about a second rotor 516b, and therefore have one end coupled to each respective rotor 516a, 516b (for example one end of the support elements 501a, 501b of the first screen structure 501 may be coupled to the first rotor 516a of the first screen structure 501, and one end of the support elements 503a, 503b of the second screen structure 503 may be coupled to the second rotor 516b of the second screen structure 503). Both the first rotor 516a and the second rotor 516b extend in a generally upright vertical orientation and have a longitudinal axis which in this example is generally perpendicular relative to the surface of the floor 400. The support elements 501a, 501b, 503a, 503b and the panel elements 544a, 544b are therefore attached to and configured to be rollable about respective rotors 516a, 516b configured to rotate about a longitudinal axis to provide for extension and retraction thereof along a direction generally perpendicular to the longitudinal axis of rotation of the rotors 516a, 516b.

In the example shown in Fig. 5, the second screen structure 503 comprises a spine element 520 which in this example is a pair of generally straight elongate members having a generally rectangular cross-sectional profile, but it will be understood that only one elongate member may be used. The spine element 520 in this example is arranged to provide structural support and stiffness to the first screen structure 550 and has a longitudinal axis parallel to the longitudinal axis of the rotor 516b. The spine element 520 may be formed from an aluminium extrusion, for ease of manufacture and assembly. The spine element 520 in the example shown includes one or more optional channels for slidably receiving one or more other components and/or mechanical fastenings, such as -17 -one or more hinge arrangements which in this example couple to each of the support elements 501a, 501b of the first screen structure 550 such that the support elements 501a, 501b of the first screen structure 550 are pivotably coupled to the second screen structure 553. The spine element 520 and the rotor 516b of the second screen structure 553 are supported by a base portion 575, and the spine element 520 and rotor 516b are offset relative to each other and/or the centre of the base portion 575, such that the angle of the panel element 544a of the first screen structure 550 relative to the rotor 516b of the second screen structure is adjustable.

In the example shown, the second screen structure 553 comprises a handle element 514 coupled to each of the two support elements 503a, 503b and/or the panel element 544b of the second screen structure 553 and comprises a generally straight elongate member which in this example has a generally square cross-sectional profile (although other cross-sectional profiles may be used). A pushing or pulling force can be applied to the handle element 514 to cause the bistable extendable members 503a, 503b and the panel 544b to be retracted/rolled up/closed or extended/pulled out/opened respectively about the rotor 516b. The handle element 514 also comprises a base element s for supporting the handle element 514. The base element 545 in this example comprises a rolling means in the form of a pair of castor wheels, configured to permit relative movement of the base element 545 of the handle element 514 of the second screen structure 553 relative to the surface 400, but it will be understood that in other examples other rolling means may be used or that no rolling means may be used at all and the base element 545 may be light enough for a user to pick up and move (pick and place').

The handle element 514 may be configured to nest with the base portion 575 to aid in storage and reduce the space occupied on the surface 400, thereby minimising the risk of a trip hazard. Nesting of the handle element 514 with the base portion 575 may also aid in retraction of the first screen structure 550 once the second screen structure 553 has been retracted.

As described above, the second screen structure 553 comprises a moveable base portion 575 configured to be engageable with the surface 400 over which the second screen structure 553 is deployed or is to be deployed to support the rotor 516b and -18 -therefore panel 544b in an upright orientation generally perpendicular to the surface 400.

The base portion 575 is operable between a first moveable configuration and a second parked configuration, wherein in the first moveable configuration the relative position of the rotor 516b of the second screen structure 553 across the surface 400 is moveable relative to the rotor 516a of the first screen structure 550, but wherein in the second parked configuration movement of the rotor 516b of the second screen structure 553 across the surface 400 relative to the rotor 516a of the first screen structure 550 is inhibited.

As can be seen more clearly in Fig. 10, the base portion 575 supporting the rotor 516b of the second screen structure 553 comprises rolling means 601 mounted within a shroud element 603. In the first moveable configuration the at least one shroud element 603 is raised relative to the rolling means 601 to permit movement of the rolling means 601 on the surface 400, and wherein in the second parked configuration the at least one shroud element 603 is lowered relative to the rolling means 601 to engage the surface 400 and inhibit movement of the rolling means 601 on the surface 400. A central shaft 611 supports the actuating mechanism 609 and a support plate 617 for supporting the rotor 516b relative to the rolling means 601.

The rotor 516b may be supported by the support plate 617 relative to the shroud element 603 such that the longitudinal axis of the rotor 516b corresponds to the centre of the shroud element 603 and the central shaft 611. However, in preferred examples, the rotor 516b is offset from the base portion 575, the centre of the shroud element 603 and the central shaft 611. Offsetting the rotor 516b relative to the base portion 575, the centre of the shroud element 603 and the central shaft 611 may improve extension of the second screen structure 553 when it is being extended at a different angle relative to the extension of the first screen structure 550. For example, offsetting the rotor 516b relative to the base element 575, the centre of the shroud element 603 and the central shaft 611 may encourage extension of the second screen structure 553 in the direction of the offset relative to the centre of the base portion 575 and/or may provide increased stability when the second screen structure 553 and the first screen structure 550 are both extended, as shown for example in Fig. 5.

-19 -I n some examples, at least one of the screen structures 550, 553 may comprise means to slow or brake rotation of the rotors 516a, 516b. It will be understood that each rotor 516a, 516b may be biased to return to a retracted configuration, for example each rotor 5 516a, 516b may comprise a spring such as a round spring loaded conveyor roller (of the type commonly found in roller blinds) to provide tension to the rotor 516a, 516b. In some examples one or both of the screen structures 550, 553 may comprise means to slow or inhibit rotation of the rotors 516a, 516b to slow retraction of the panel elements 544a, 544b. For example, there may a brake operable e.g., via an actuating means, such as in 10 the handle element 514 or base portion 575 to slow rotation of the rotor 516b of the second screen structure 553.

It will also be understood that in some examples a series of screen systems 500 may be used adjacent to each, e.g., to provide privacy to a series of beds on a ward of a hospital. In such examples, it may be desirable to couple the handle element 514 and/or the base element 545 of the second screen structure 553 to a portion of an adjacent screen system, such as the base portion 575 of an adjacent screen system and/or the spine element 520 of an adjacent screen system. It will therefore be understood that the handle element 514 and/or base element 545 may comprise means to detachably couple to the base portion 575 and/or spine element 520 of an adjacent screen system, and that the base portion 575 and/or spine element 520 may also comprise means to couple to the handle element 514 and/or base element 545 of an adjacent screen system. The means to detachably couple may comprise a latch or locking mechanism, or any other similar mechanism to permit detachable fastening.

As shown more clearly in Figs. 6 to 9 and 11, the shroud element 603 is circular but in other examples may form another shape, for a polygon such as a pentagon, hexagon etc. The shroud element 603 may also be tapered such that it is wider at its base. In the examples shown, the shroud element has a 350 mm diameter. To inhibit movement of the rolling means 601 on the surface 400 when in the second parked configuration, the shroud element 603 may also have a means to increase friction, such as a rubber ring 640 (as shown in Fig. 10), around the base of the shroud element 603, configured to engage the surface 400 when in the second parked configuration.

-20 -As can be seen in Figs. 6 to 9 and 11, the base portion 575 further comprises an actuating mechanism 609 operable to move the base portion 575 between the first moveable configuration and the second parked configuration. In the examples shown, the actuating mechanism 609 is operable by retraction or extension of the at least one support element 5031, 503b and the panel element 544b, to move the base portion 575 between the first moveable configuration and the second parked configuration.

In the example shown in Figs. 6 to 9, the actuating mechanism 609 comprises a lever arm, which in this example is coupled to the shroud element 603 via an eccentric pivot and a bell crank 607, although the lever arm may equally engage, for example, a hydraulic piston to actuate movement of the shroud element 603 relative to the rolling means 601. However, it will be understood that in other examples the actuating mechanism 609 may take other forms; for example, the actuating mechanism 609 may be operated by rotation of the rotor 516b of the second screen structure 553. Additionally, or alternatively, the actuating mechanism 603 may comprise a hydraulic piston and wherein at least a portion of the handle element 514 is configured to engage a hydraulic actuator in a first axis to actuate the hydraulic piston to lift or lower the shroud element 603 of the base portion 575 relative to the rolling means 601 in a direction transverse to the first axis.

In the example shown in Figs. 6 to 9 a portion of the handle element 514 is configured to engage the lever arm to actuate the actuating mechanism 609 to lift or lower the shroud element 603 of the base portion 575 relative to the rolling means 601 and relative to central shaft 611 (that lies in the central axis of the shroud element 603) that acts to support the rotor 516b (via support plate 617) and the actuating mechanism 609 relative to the surface 400 and the rolling means 601.

As shown, for example, in Figs. 6 to 9, at least a portion of the handle element 514 is configured to engage the actuating mechanism 609 to move the base portion 575 between the first moveable configuration and the second parked configuration, such that when the handle element 514 bears against the actuating mechanism 609 the base portion 575 is held in the first moveable configuration, and when the handle element 514 -21 -no longer bears against the actuating mechanism 609 the base portion 575 is in the second parked configuration. To this end, in the examples shown the handle element 514 of the second screen structure 553 comprises an engagement portion 615 configured to engage the actuating mechanism 609. In the example shown, the 5 engagement portion 615 is a protrusion projecting from the handle element 514 transverse to the longitudinal axis of the handle element 514. In the example shown the end face of the engagement portion 615 is sloped or inclined relative to the longitudinal axis of the handle element 514 to engage the actuating mechanism 609 to guide the actuating mechanism 609 to the first moveable configuration when it makes contact with 10 the actuating mechanism 609.

As shown, for example, in Fig. 9, as the engagement portion 615 of the handle element 514 of the second screen structure 553 bears against the actuating mechanism 609 to move the base portion 575 between the second parked position and the first moveable position, the base element 545 coupled to the handle element 514 is raised off of the surface 400 by the base portion 575. Advantageously this may help in manoeuvrability if the screen structure as it is packed away.

In the examples shown, the base portion 575 also comprises a locking mechanism 613 to removably secure the handle element 514 of the second screen structure 553 to the base portion 575. In the example shown, the locking mechanism 613 comprises a latch mechanism, comprising a horizontal bar (e.g., extending in a direction transverse to the longitudinal axis of the handle element 514 and transverse to the direction of protrusion of the engagement portion 615 from the handle element 514) coupled to the base portion 575. The handle element also comprises a latch mechanism (not shown) configured to engage the horizontal bar to detachably secure the handle element 514 to the base portion 575. The latch mechanism may be actuatable by a lock actuating means on the handle element 514 of the second screen structure 553. The lock actuating means may be, for example, a button or lever located in or on the handle element 514 Additionally, or alternatively, the locking mechanism 613 may be configured to detach once a force above a selected threshold level of force is applied. For example, the locking mechanism 613 may be configured to release the handle element 514 if the -22 -handle element 514 is pulled with a force above a selected level of force. Advantageously, this may mean that the handle element 514 may be used to control movement of the base portion 575 and thereby extension of the first screen structure 550 when the base portion 575 is in the first moveable configuration, and extension of the second screen structure 553 when the base portion 575 is in the second parked configuration (as when the base portion 575 is in the second parked configuration it will be more resistant to movement and thereby if the user pulls on the handle element 514 they will detach the handle element 514 from the base portion 575).

In some examples, as shown for example more clearly in Figs. 8 and 9, the engagement portion 615 may comprise a pair of guide plates attached either side of the handle element 514, configured to pass either side of the locking mechanism 613 (which in this example has a width approximately the same as that of the handle element 514) to securely guide the handle element 514 into the correct position on the base portion 575 to both engage the engagement portion 609 and/or the locking mechanism 613.

As can be seen, for example, in Fig. 10 the rolling means 601 comprise a plurality of rolling means (in this example, five) distributed evenly around the perimeter of the base portion 575 which may advantageously act to improve stability of the base portion 575 and thereby the screen structure when extending/retracting. In this example the rolling means comprise castor wheels. Each castor wheel is housed within a corresponding cylindrical recess within the shroud element 603 to permit movement in any of 360 degrees of movement.

In some examples the base portion 575 also comprises a guide element 1103 for guiding retraction of the handle element 514 back towards the base portion. Advantageously the guide ensures that the handle element 514 approach the base portion 575 to engage the actuating mechanism 609 and the locking mechanism 613. The guide element 1103 may be configured to engage with a corresponding protrusion (not shown) on the handle element 514 to guide movement of the handle element 514 towards the base portion 575 as the second screen structure 553 is retracted. As can be seen in Fig. 11, the guide 1103 is in the form of a plate mounted above the support plate 617 (although it will be understood that in other examples it may be mounted below the support plate 617) and -23 -contains a central channel bounded on either side by curved portions to smoothly guide a corresponding protrusion on the handle element 514 into the central channel. The central channel may be aligned with the centre of the shroud element 603 to guide the protrusion on the handle element 514 (and thereby the handle element 514 itself) towards the centre of the base portion 575. Dependent on the relative position of the rotor 516b (which may be off-centre relative to the centre of the base portion 575 and the shaft 613), the curved portions of the guide element 1103 may differ in geometry; for example as can be seen in Fig. 11, a portion of the guide element 1103 closer to the rotor 516b may have a more rounded geometry (e.g., a smaller radius of curvature) than a portion of the guide further from the rotor 516 on the other side of the central channel relative to the rotor 516, which may have a more gradual radius of curvature (e.g., a larger radius of curvature). As can also be seen in Fig. 11, the guide element 1103 extends around the base of the rotor 516b mounted on support plate 617 to prevent the handle element 514 from rubbing against the panel 544b or support element 503b and thereby to protect the screen structure.

As can also be seen in Fig. 11, the screen structure here comprises a pair of spine elements 1101 which are in the form of elongate members extending parallel to the longitudinal axis of the rotor 516b and are supported on the support plate 617. The pair of spine elements may provide structure support and increased stiffness to the screen structure, particularly when the screen structure is being moved (e.g., retracted or extended) and pushed or pulled by a user. It can also be seen how the panel 544a and the support 501b of the first screen structure 550 are pivotably coupled to one of the spine elements 1101. This may allow the angle of the panel element 544a of the first screen structure 550 to be adjustable relative to the rotor 516b, and the panel 544b, of the second screen structure 553.

Although not shown in Fig. 11, it will be appreciated that in some examples there may be a corresponding guide element 1103 at the other end (i.e., the top) of the rotor 516 to 30 also guide the handle element 514 near the top of the second screen structure 553 and to also protect the support 503a Figs. 12A and 12B show a modification of the base portion 575 of Figs. 6 to 11, whereby -24 -in this example much of the actuating mechanism 609 (in particular the bell crank 607) is concealed within a circular duct 1203 coaxial with the central shaft 611. This may advantageously prevent any loose items being caught/trapped in the workings of the actuating mechanism 609. Also shown in Figs. 12A and 12B are additional weights 1201 that have been distributed around the periphery of the base of the shroud element 603. Providing additional weights 1201 around the periphery of the base of the shroud element 603 may improve stability of the base portion 575 when in use. It will be understood that in the context of the present disclosure, there is a complex balance between the need of the base portion 575 to provide stability to the rotor but also to provide manoeuvrability and minimise footprint and trip hazard. Providing such weights 1201 around the periphery of the base of the shroud element 603 may improve stability and reduce footprint, without impacting on manoeuvrability.

It will be appreciated that although the base portion 575 described above has been 15 described in the context of a screen system comprising a first screen structure 550 and a second screen structure 553, in some examples the base portion 575 may be used for a single screen structure (i.e., that does not require fixation to a wall).

Additionally, or alternatively, rather than having a first screen structure 550 and a second screen structure 553 with the rotor 516b of the second screen structure 553 coupling to the handle element/end of the panel element 544a of the first screen structure 550, in some examples the rotors 516a, 516b of two screen structures may be at opposing ends of the system 500, for example as shown in Figure 13.

For example, the screen system shown in Fig. 13 comprises a first screen structure having a first rotor 516a and a second screen structure having a second rotor 516b each having respective longitudinal axes. Both rotors 516a, 516b are coupled to opposite ends of respective panel elements 544a, 544b attached to at least one support element, wherein the at least one support element and the respective panel elements 544a, 544b are attached to and configured to be rollable about the respective rotors 516am 516b to provide for extension and retraction thereof along a direction generally perpendicular to the respective longitudinal axes.

-25 -In the example shown, each rotor 516a, 516b is supported by a respective base portion 575a, 575b (for example the base portion 575 shown in Figs. 5 to 12B) such that the rotor 516b of the second screen structure is configured to be moveable relative to the rotor 516a of the first screen structure and to support each rotor 516a, 516b and therefore panel 544a, 544b in an upright orientation generally perpendicular to the surface 400. As described above with reference to Figs. 5 to 12B, the base portion may be operable between a first moveable configuration and a second parked configuration, wherein in the first moveable configuration the relative position of the rotor 516b of the second screen structure across the surface 400 is moveable relative to the rotor 516a of the first screen structure, but wherein in the second parked configuration movement of the rotor 516b of the second screen structure across the surface 400 relative to the rotor of the first screen structure is inhibited.

In the example shown, the two panel elements 544a, 544b may be coupled together, for example via a hinge arrangement, to a supporting post 1301, although it will be understood that in other examples there may only be a single panel element, and the single panel element may comprise a support post 1301 arranged to support a portion of the single panel element, for example to support the single element around a bend. The support post 1301 may comprise a base element, for example similar to the base element 545 described above. For example, the base element may comprise rolling means configured to permit relative movement of the base element relative to the surface. However, it will also be appreciated that the base element may be a static base without rolling means (for example a "pick and place" base). In such examples the base of the support post 1301 may have means to increase friction with the surface 400, such as a rubberised base.

While in the example shown in Figure 13 both rotors 516a, 516b are coupled to respective base portions 575a, 575b, it will be appreciated that in some examples one of the rotors 516a, 516b may be coupled to at least one hinge arrangement and configured to provide for the rotor 516a, 516b to pivot about a longitudinal axis arranged generally parallel to the longitudinal axis of the rotor 516a, 516b, for example as shown in Figures 4A and 4B.

-26 -It will be appreciated from the discussion above that the embodiments shown in the Figures are merely exemplary, and include features which may be generalised, removed or replaced as described herein and as set out in the claims. In the context of the present disclosure other examples and variations of the apparatus and methods described herein will be apparent to a person of skill in the art.

Claims

-27 -CLAIMS: 1. A screen system for deployment over a surface, comprising: a first screen structure and a second screen structure, wherein each screen structure comprises a panel element attached to at least one support element, wherein the at least one support element and the panel element are attached to and configured to be rollable about a rotor configured to rotate about a longitudinal axis to provide for extension and retraction thereof along a direction generally perpendicular to the longitudinal axis; and wherein the rotor of the second screen structure is configured to be moveable relative to the rotor of the first screen structure.
2. The screen system of claim 1 wherein the at least one support element of the first 15 screen structure is pivotably coupled to the second screen structure, such that the angle of the panel element of the first screen structure relative to the rotor of the second screen structure is adjustable.
3. The screen system of any of the previous claims wherein the second screen 20 structure comprises a base portion configured to be engageable with a surface over which the second screen structure is deployed or is to be deployed to support the rotor and therefore panel in an upright orientation generally perpendicular to the surface.
4. The screen system of claim 3 wherein the base portion is operable between a first moveable configuration and a second parked configuration, wherein in the first moveable configuration the relative position of the rotor of the second screen structure across the surface is moveable relative to the rotor of the first screen structure, but wherein in the second parked configuration movement of the rotor of the second screen structure across the surface relative to the rotor of the first screen structure is inhibited.
5. The screen system of claim 4, wherein the second screen structure comprises: an actuating mechanism, operable by retraction or extension of the at least one support element and the panel element, to move the base portion between the first -28 -moveable configuration and the second parked configuration.
6. The screen system of claim 5 wherein the second screen structure comprises a handle element for extending and retracting the at least one support element and the 5 panel element upon application of a force to the handle element; and wherein at least a portion of the handle element is configured to engage the actuating mechanism to move the base portion between the first moveable configuration and the second parked configuration, such that when the handle element bears against the actuating mechanism the base portion is held in the first moveable configuration, and when the handle element no longer bears against the actuating mechanism the base portion is in the second parked configuration.
7. The screen system of claim 6 wherein the second screen structure comprises a guide element configured to receive at least a portion of the handle element and 15 configured to guide at least a portion of the handle element towards the actuating mechanism.
8. The screen system of claim 7 wherein the handle element of the second screen structure comprises an engagement portion configured to be guided by the guide 20 element and configured to engage the locking mechanism.
9. The screen system of any of claims 6 to 8 further comprising a locking mechanism to removably secure the handle element of the second screen structure to the base portion, wherein the locking mechanism is actuatable by a lock actuating means 25 on the handle element of the second screen structure.
10. The screen system of any of claims 3 to 9 wherein the base portion comprises rolling means and a shroud element, and wherein in the first moveable configuration the at least one shroud element is raised relative to the rolling means to permit movement of the rolling means on the surface, and wherein in the second parked position the at least one shroud element is lowered relative to the rolling means to engage the surface and inhibit movement of the rolling means on the surface.
-29 - 11. The screen system of claim 10 wherein the actuating mechanism comprises a lever arm, and wherein at least a portion of the handle element is configured to engage the lever arm to actuate the actuating mechanism to lift or lower the shroud element of the base portion relative to the rolling means.
12. The screen system of claim 11 wherein the lever arm is coupled to the shroud via an eccentric pivot.
13. The screen system of claim 11 or 12 wherein the actuating mechanism comprises a bell crank.
14. The screen system of any of claims 5 to 10 wherein the actuating mechanism comprises a hydraulic piston and wherein at least a portion of the handle element is configured to engage a hydraulic actuator in a first axis to actuate the hydraulic piston to lift or lower the shroud element of the base portion relative to the rolling means in a direction transverse to the first axis.
15. The screen system of any of claims 5 to 14 wherein the handle element of the second screen structure has a longitudinal axis, and the handle element of the second screen structure comprises a base element configured to support the handle element, and thereby the panel element, in a generally perpendicular orientation relative to the surface, and parallel to the longitudinal axis of the rotor of the second screen structure.
16. The screen system of claim 15 wherein as the handle element of the second screen structure bears against the actuating mechanism to move the base portion between the second parked position and the first moveable position, the base element coupled to the handle element is raised off of the surface by the base portion.
17. The screen system of claim 15 or 16 wherein the base element of the handle element of the second screen structure comprises rolling means configured to permit relative movement of the base element of the handle element of the second screen structure relative to the surface.-30 -
18. The screen system of any of the previous claims wherein the first screen structure comprises at least one hinge arrangement coupled to the rotor of the first screen structure and configured to provide for the rotor of the first screen structure to pivot about a second longitudinal axis arranged generally parallel to the longitudinal axis of the rotor of the second screen structure
19. The screen system of any of the previous claims wherein the at least one support element of each screen structure comprises a bistable extendable member.
20. A screen structure for deployment over a surface, comprising: a panel element attached to at least one support element, wherein the at least one support element and the panel element are attached to and configured to be rollable about a rotor configured to rotate about a longitudinal axis to provide for extension and retraction thereof along a direction generally perpendicular to the longitudinal axis; and a base portion configured to be engageable with and support the rotor in an upright orientation relative to the surface over which the screen structure is deployed or is to be deployed; wherein the base portion is operable between a first moveable configuration and a second parked configuration, wherein in the first moveable configuration the relative position of the rotor of the screen structure across the surface is moveable, but wherein in the second parked configuration movement of the rotor of the screen structure across the surface is inhibited.
21. The screen structure of claim 20 further comprising an actuating mechanism, 25 operable by retraction or extension of the at least one support element and the panel element, to move the base portion between the first moveable configuration and the second parked configuration.
22. The screen structure of claim 21 further comprising a handle element for 30 extending and retracting the at least one support element and the panel element upon application of a force to the handle element; and wherein at least a portion of the handle element is configured to engage the actuating mechanism to move the base portion between the first moveable configuration -31 -and the second parked configuration, such that when the handle element bears against the actuating mechanism the base portion is held in the first moveable configuration, and when the handle element no longer bears against the actuating mechanism the base portion is in the second parked configuration
23. The screen structure of claim 22 wherein the base portion comprises a guide element configured to receive at least a portion of the handle element and configured to guide at least a portion of the handle element towards the actuating mechanism.
24. The screen structure of claim 22 or 23 further comprising a locking mechanism to removably secure the handle element of the second screen structure to the base portion, wherein the locking mechanism is actuatable by a lock actuating means on the handle element of the second screen structure.
25. The screen structure of any of claims 20 to 24 wherein the base portion comprises rolling means and a shroud element, and wherein in the first moveable configuration the at least one shroud element is raised relative to the rolling means to permit movement of the rolling means on the surface, and wherein in the second parked position the at least one shroud element is lowered relative to the rolling means to engage the surface and inhibit movement of the rolling means on the surface.
26. The screen structure of claim 25 wherein the locking means comprises a lever arm, and wherein the handle element is configured to engage the lever arm to actuate the locking mechanism to lift or lower the shroud element of the base portion relative to 25 the rolling means.
27. The screen structure of claim 26 wherein the lever arm is coupled to the shroud via an eccentric pivot.
28. The screen structure of any of claims 20 to 27 wherein the at least one support element comprises a bistable extendable member.
29. A screen system for deployment over a surface, comprising: -32 -a first rotor and a second rotor each having respective longitudinal axes, wherein both rotors are coupled to opposite ends of a panel element attached to at least one support element, wherein the at least one support element and the panel element are attached to and configured to be rollable about the rotors to provide for extension and retraction thereof along a direction generally perpendicular to the respective longitudinal axes; and wherein the rotor of the second screen structure is configured to be moveable relative to the rotor of the first screen structure.
30. The screen system of claim 29 wherein at least one of the rotors is coupled to a base portion configured to be engageable with a surface over which the second screen structure is deployed or is to be deployed to support the rotor and therefore panel in an upright orientation generally perpendicular to the surface; wherein the base portion is operable between a first moveable configuration and a second parked configuration, wherein in the first moveable configuration the relative position of the rotor of the second screen structure across the surface is moveable relative to the rotor of the first screen structure, but wherein in the second parked configuration movement of the rotor of the second screen structure across the surface relative to the rotor of the first screen structure is inhibited.
31. The screen system of claim 30 wherein both rotors are coupled to respective base portions operable between a first moveable configuration and a second parked configuration.
32. The screen system of claim 29 or 30 wherein at least one of the rotors is coupled to at least one hinge arrangement and configured to provide for the rotor to pivot about a longitudinal axis arranged generally parallel to the longitudinal axis of the rotor.