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Title:
SAFETY SCREEN
Document Type and Number:
WIPO Patent Application WO/2019/224521
Kind Code:
A1
Abstract:
A safety screen comprises a frame (1) mounting a plurality of overlapping parallel blades (5), each blade having a reinforcing axial member (2) extending therethrough. The ends of each axial member are mounted in opposed sides of t e frame, the blades being linked so as to rotate together, whereby the blades are rotatable between an open position, wherein the blades lie in a plane normal to the plane of the frame, to a closed position, wherein the blades overlap to form a continuous surface. The frame also mounts first and second transparent sheets (12) with the blades therebetween, the sheets being spaced from the blades in their open position and formed from a material such that ballistic impact or explosion pressure wave to one side of the screen will deflect the sheet inwardly towards the blades and cause the blades (5) to rotate to the closed position thereof.

Inventors:
WILKINS BRIAN (GB)
Application Number:
GB2019/051324
Publication Date:
November 28, 2019
Filing Date:
May 15, 2019
Export Citation:
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Assignee:
WILKINS BRIAN MALCOLM (GB)
International Classes:
E06B9/26; E06B5/12
Domestic Patent References:
WO2011080516A12011-07-07
WO2003091526A22003-11-06
WO2011080516A12011-07-07
WO2015181540A12015-12-03
Foreign References:
GB2443826A2008-05-21
GB201621334A2016-12-15
Attorney, Agent or Firm:
LOVEN PATENTS & TRADEMARKS LIMIITED (GB)
Download PDF:
Claims:
CLAIMS

1. A safety screen comprising a frame mounting a plurality of over lapping parallel blades, each blade having a reinforcing axial member extending therethrough, the ends of each axial member being mounted in opposed sides of the frame, the blades being linked so as to rotate together, whereby the blades are rotatable between an open position, wherein the blades lie in a plane normal to the plane of the frame, to a closed position, wherein the blades over lap to form a continuous surface, the frame also mounting first and second transparent sheets with the blades therebetween, the sheets being spaced from the blades in their open position and formed from a material such that ballistic impact or explosion pressure wave to one side of the screen will deflect the sheet inwardly towards the blades and cause the blades to rotate to the closed position thereof.

2. A safety screen according to Claim 1 , wherein the blades com prise a ballistics-resisting material.

3. A safety screen according to Claim 2, wherein the ballistics- resisting material is a fibre reinforced plastics material.

4. A safety screen according to Claim 2, wherein the ballistics- resisting material is a ceramic material.

5. A safety screen according to Claim 2, wherein the ballistics- resisting material is a metal.

6. A safety screen according to any of Claims 2 to 5, wherein each blade comprises a shaped polymeric material shell surrounding the ballistics- resisting material

7. A safety screen according to any preceding claim, wherein the transparent sheets comprise a polycarbonate material.

8. A safety screen according to any preceding claim, wherein the transparent sheets are formed of a laminated material.

9. A safety screen according to any preceding claim, wherein the re inforcing axial members are steel rods.

10. A safety screen according to any preceding claim, wherein the frame is rectangular.

1 1. A safety screen according to any preceding claim, wherein the blades extend vertically in the frame.

12. A safety screen according to any preceding claim, wherein the blades extend horizontally in the frame.

13. A safety screen according to any preceding claim, comprising drive means for rotating the blades between the open and closed positions thereof.

14. A safety screen according to any preceding claim, comprising wireless control means for operating the drive means.

15. A safety installation comprising a plurality of safety screens ac cording to any of the preceding claims securely mounted upright and spaced apart in a public space.

16. A safety installation comprising at least one safety screen accord ing to any of Claims 1 to 14, mounted so as to fill an aperture in a ballistics- resisting structure.

Description:
SAFETY SCREEN

Field of the Invention

[0001] This invention relates to a safety screen suitable, for example, for re ducing the impact of explosions in public spaces and for protection from gunfire. Background to the Invention

[0002] There have been many instances of gun and bomb attacks in public spaces such as airport concourses and the like, and the nature of public spaces is necessarily that they are open and therefore do not provide ready cover from the effects of any attack. Although the installation of shielding is possible, this will break up the public space and decrease visibility, which could present a dif ferent risk to public safety. There is therefore a need for shields or screens which can protect from the effect of explosions and from ballistic strike.

[0003] WO201 1/080516 A1 discloses a safety screen comprising a primary shutter frame having a plurality of parallel blades extending across it. The blades have a cross-sectional shape which includes a point at each opposed edge of the blade, and a reinforcing rod extends axially through each blade, en gaging in respective opposed sides of the primary shutter frame. The blades are linked together and rotatable such that rotation of one induces the other blades to rotate simultaneously between a closed position in which the blades lie substantially parallel to the primary frame so as to form a continuous shutter, and an open position substantially normal to the closed position. A sheet of transparent plastic material is mounted in a secondary frame extending from the primary frame so as to be positioned between a window and the edges of the blades when in the open position. If an explosion occurs internally of the enclo- sure of which the screen forms a part, the window is distorted by the pressure wave, pushing the plastic material against the blades causing them to close to contain the pressure wave largely within the enclosure. Similarly, the frames may be mounted within a window opening to protect against external blast.

Summary of the Invention

[0004] According to the invention, there is provided a screen comprising a frame mounting a plurality of overlapping parallel blades, each blade having a reinforcing axial member extending therethrough, the ends of each axial mem ber being mounted in opposed sides of the frame, the blades being linked so as to rotate together, whereby the blades are rotatable between an open position, wherein the blades lie in a plane normal to the plane of the frame, to a closed position, wherein the blades overlap to form a continuous surface, the frame al so mounting first and second transparent sheets with the blades therebetween, the sheets being spaced from the blades in their open position such deflection inwardly of the sheet due to ballistic impact or explosion pressure wave will cause the sheet to rotate the blades towards the closed position thereof.

[0005] The blades are suitably formed of a ballistics-resisting material, for example a carbon-fibre reinforced plastics material. The axial members are suitably formed of steel and each is either wholly enclosed within the blade or is located in a recess moulded into one face of the blade, for example as dis closed in WO2015/181540 A1.

[0006] The blades may be mounted in the frame in the manner described and claimed in my earlier application GB1621334.0, filed on 15 December 2016.

[0007] In typical use, a plurality of the screens will be mounted within a pub lic space, in particular adjacent to entrances to the space, so that in the event of an attack on the public space, the public can seek shelter behind the screens, which will reduce the direct effect of a blast but will also resist ballistic strike. The screens will, in normal conditions, allow light through and enable a view of the space beyond them, but will be closed by blast or ballistic strike to form a closed protective screen through which people sheltering cannot be seen.

[0008] The screen could also be mounted in a masonry structure, for exam ple to serve as a window, or in some other ballistics-resisting structure, for ex ample a structure filled with loose ceramic beads that disintegrate to absorb the energy of a ballistics strike, the loose structure maintaining continuity of protec tion by other beads, especially spherical beads, flowing into the space created by the disintegration. Such structures have the advantage of not requiring heavy steels casings; instead, the beads can be packed between any pair of non-horizontal sheet members, for example plywood, plasterboard, plastics or aluminium. It is just necessary to avoid any lack of continuity between the edg es of the safety screen of the invention and the structure in which it is mounted.

Brief Description of the Drawings

[0009] In the drawings, which illustrate an exemplary embodiment of the in vention:

Figure 1 is a cross-sectional plan view through a screen in the open posi tion thereof;

Figure 2 is a corresponding view to that of Figure 1 , after an attack has caused closure of the screen;

Figure 3 is a cross-sectional elevation of a first metal profile member suitable for forming the top and bottom parts of the frame of the screen;

Figure 4 is a cross-sectional elevation of a second metal profile member suitable for forming the sides of the frame; and

Figure 5 is an isometric view of the screen installed in a public space.

Detailed Description of the Illustrated Embodiment

[0010] Referring first to Figure 1 , the screen is in the form of a rectangular frame 1 in which a plurality of parallel equally-spaced vertical steel rods 2 are mounted for rotation in the upper 3 and lower 4 parts of the frame. Each rod 2 extends through the centre of a blade 5, suitably formed of polymeric material or extruded aluminium and having a continuous space 6 therein which contains a ballistics-resisting filling, such as carbon fibre-reinforced laminate material, or resin-bonded ceramic beads. When the blades overlap in the closed position as illustrated in Figure 2, the full width of screen is protected by the ballistics- resisting material, so that any projectile striking the screen will encounter the ballistics-resisting material and its kinetic energy will be sufficiently dissipated to ensure that it cannot pass through the screen and harm people sheltering be hind it. It will be appreciated that the ballistics-resisting material could alterna tively be formed of metal, such as steel, or a ceramic material, and that multiple layers of material could be employed. It will also be appreciated that, while the rod conveniently has a circular cross-section, other profiles could be used. [0011] The frame 1 is suitably formed from first shaped profile members 10, as illustrated in Figure 3, at the top and bottom, with second shaped profile members 1 1 , as illustrated in Figure 4, forming the sides of the frame. The first shaped profile members 10 are formed with deep grooves 10a along each side thereof for receiving an edge of a sheet of transparent material 12 (Figures 1 and 2), while the second shaped profile members 1 1 are formed with an out wardly-extending (relative to the position of the member in the frame) flange 1 1 a along each side thereof and an inwardly-extending fin 1 1 b extending along the member on each side, spaced from the outer edge of the respective flange 1 1 a by a distance very slightly larger than the thickness of said sheet material.

A closure strip 13 is fastened to each flange 1 1 a, for example by screws 14 or rivets or other suitable fastener, so as to define with the fins 1 1 b a groove for mation to receive the side edges of the said sheet of transparent material 12. The width of the grooves is in each case sufficient to hold the sheet edges against movement in normal use of the screen, but to allow movement of the sheet in the event of a ballistics strike or impact by a shock wave due to an ex plosion.

[0012] It will be appreciated that the frame could be formed with just the first profile members or just the second profile members on all sides, or with the first profile members forming the sides of the frames and the second profile mem bers forming the top and bottom of the frame. The provision of the closure strips 13 facilitates fitting of the transparent sheets during manufacture and so to enable replacement of the sheets in situ, it may be desirable to form the frame with the first profile only at the bottom of the frame, the second profile members forming the other three sides of the frame.

[0013] The transparent sheet material 12 mounted on each face of the frame with the blades between them will suitably be a laminate including one or more polycarbonate sheets, designed to absorb energy from the impact of a bullet and thus to reduce its velocity substantially. The effect of an impact by a bullet or other projectile, or by the blast from an explosion, to one side of the frame will be to distort the sheet 12 inwardly towards the blades, which are initially in the position shown in Figure 1. The blade-carrying rods 2 are linked together so that if one rotates all the blades rotate with it. Thus, when the sheet distorts into contact with at least one of the blades, it causes the blades to rotate towards the closed position thereof, as shown in Figure 2, creating a continuous shield which will provide a barrier against further ballistics strike and against flying de- bris from an explosion.

[0014] In order to provide effective protection in a public space, such as an airport terminal building or railway station concourse, the screens will need not only to be firmly secured to the ground or floor, as illustrated in Figure 5, but al so to be provided with suitable bracing for the upper part of the frame, for ex- ample by connections to the framework of the building and possible to an adja cent such screen. Alternatively, the screen may be incorporated into a masonry or other structure to constitute a window or viewing panel, without the need for any other window structure or glass.

[0015] It will be appreciated that, while the screen of the invention is illustrat- ed with vertical blades, the use of horizontally-arranged blades is an alternative for some applications, for example where improved side-to-side visibility is re quired, but at the expense of vertical range.