A SAFETY NET FOR A VERTICAL WIND TUNNEL

Abstract

Invention relates to safety nets for vertical wind tunnels, especially for vertical wind tunnels with glass wall that surrounds a flight platform or area. A safety net for a vertical wind tunnel comprising an annular frame (1) arranged therearound a flight area (2), a plurality of cables (3) forming a net area (4) over the flight area (2), springs (5) attached to the each end of the cables and to the annular frame (1). The springs (5) and each end of plurality of cables (3) is enclosed by the annular frame (1) so that only cables (3) are exposed to the flight area (2) and to a user of the safety net.

Claims

1. A safety net for a vertical wind tunnel comprising: an annular frame arranged therearound a flight area, wherein the annular frame has an upper surface, a lower surface, an outer surface and an inner surface that is exposed to the flight area; a plurality of cables forming a net area over the flight area, springs, wherein each end of plurality of cables is attached to the annular frame via springs, wherein the springs and each end of plurality of cables is enclosed by the annular frame so that only cables are exposed to the flight area and a user of the safety net, a slider arranged in the annular frame at the inner surface thereof, wherein the slider extends from the upper surface to the lower surface of the annular frame and the slider further comprises guide openings extending from the upper surface to the lower surface of the annular frame so that the cables may extend through the guide openings and can move along the guide openings up and down without touching the annular frame or any other member of the vertical wind tunnel, when a user of the vertical wind tunnel walks or falls on the net area.

2. The safety net according to claim 1, wherein the slider further comprises an auxiliary guide openings positioned orthogonally to the guide openings so that the cables that are orthogonally positioned relative to other cables may extend through the slider and other cables can move along the auxiliary guide openings up and down, when a user of the vertical wind tunnel walks or falls on the net area.

3. The safety net according to claim 1, wherein the guide opening further comprises a brush that covers the guide opening so that a movement of the cable is allowed, but noise level in spectator area that is generated by the vertical wind tunnel is reduced.

4. The safety net according to claim 1, wherein the safety net further comprises an entrance unit arranged in the annular frame where an entrance in the flight area of the vertical wind tunnel is positioned.

5. The safety net according to claim 4, wherein the entrance unit comprises: an entry platform positioned in the same level as the upper surface of the annular frame, where a first end of the entry platform is hingedly attached to the entrance unit and a second end of the entry platform is free and extends until the flight area, a belt attached to the second end of the entry platform and covers the surface of the entrance unit that is exposed to the flight area; a resilient member with one end thereof attached to the belt and with another end thereof attached to the entrance unit so that the belt is kept tensioned when the entry platform is hingedly moved, when a user of the vertical wind tunnel walks in or out from the flight area.

6. The safety net according to claim 4, wherein the entrance unit comprises: an entry platform positioned in the same level as the upper surface of the annular frame, where a first end of the entry platform is hingedly attached to the entrance unit and a second end of the entry platform is free and extends up to the flight area, a first and a second plates hingedly attached to each other by the hinge and the first plate is hingedly attached to the second end of the entry platform and the second plate is attached to the lower surface of the entrance unit or the annular frame and both plates cover the surface of the entrance unit that is exposed to the flight area; a resilient member with one end thereof attached to the hinge and with another end thereof attached to the entrance unit or the annular frame so that plates are folded when the entry platform is hingedly moved downwards towards the lower surface of the annular frame, when a user of the vertical wind tunnel walks in or out from the flight area.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG. 1 illustrates a safety net for vertical wind tunnel ready to be installed in vertical wind tunnel that is enclosed by a glass wall.

[0017] FIG. 2 illustrates a safety net with cut out segment for ease of understanding on how cables 3 are enclosed in an annular frame 1 that surrounds a flight area 2.

[0018] FIG. 3 illustrates a cross section of the annular frame 1 with a spring 5 and cables 3.

[0019] FIG. 4 illustrates a cross section of an entrance unit 20.

[0020] FIG. 5 illustrates section of the annular frame 1 in a view from above and with cut out in an upper surface of the annular frame 1 exposing a slider 10 with guide openings 11 and orthogonally positioned auxiliary guide openings 12.

[0021] FIG. 6 a top view of a safety net without an upper surface of the annular frame 1 so that a complete arrangement of cables 3 is seen.

[0022] FIG. 7 illustrates cutaway of annular frame with sliders but without safety net.

[0023] FIG. 8 illustrates a cross section of an entrance unit 20 of another embodiment.

DETAILED DESCRIPTION OF THE INVENTION

[0024] Before explaining the disclosed embodiment of the present invention in detail, it is to be understood that the invention is not limited in its application to the details of the particular arrangements shown, since the invention is capable of other embodiments. Also, the terminology used herein is for the purpose of description and not of limitation.

[0025] A safety net (as seen in FIGS. 1, 2 and 6) for a vertical wind tunnel comprises an annular frame 1 arranged therearound a flight area 2 of vertical wind tunnel where a flight may be performed. The safety net further comprises a plurality of cables 3 forming a net area 4 over the flight area 2 and springs 5, wherein each end of plurality of cables 3 is attached to the annular frame 1 via springs 5.

[0026] The annular frame 1 (as seen in FIG. 3) has an upper surface 6, a lower surface 7 and an outer surface 8 in form of plates that encloses the annular frame 1. An inner surface 9 is exposed to the flight area 2. The springs 5 and each end of plurality of cables 3 is enclosed by the annular frame 1 so that only cables 3 are exposed to the flight area 2 and a user of the safety net.

[0027] The safety net further comprises a slider 10 (as seen in FIGS. 2, 3, 5, 6 and 7) arranged in the annular frame 1 at the inner surface 9 thereof and substantially around the flight area 2. The the slider 10 extends from the upper surface 6 to the lower surface 7 of the annular frame 1. The slider 10 further comprises guide openings 11 extending from the upper surface 6 to the lower surface 7 of the annular frame 1 so that the cables 3 may extend through the guide openings 11 and can move along the guide openings 11 up and down without touching the annular frame 1 or any other member of the vertical wind tunnel, when a user of the vertical wind tunnel walks or falls on the net area 4.

[0028] The slider 10 further comprises auxiliary guide openings 12 (as seen in FIG. 5) positioned orthogonally to the guide openings 11 so that the cables 3 that are orthogonally positioned relative to other cables 3 may extend through the slider 10 and other cables 3 can move along the auxiliary guide openings 12 up and down, when a user of the vertical wind tunnel walks or falls on the net area 4.

[0029] The safety net further comprises an entrance unit 20 (as seen in FIGS. 1, 2, 4, 6 and 7) arranged in one segment of the annular frame 1. The entrance unit 20 defines an entrance in the flight area 2 of the vertical wind tunnel.

[0030] The entrance unit 20 (as seen in FIG. 4) further comprises an entry platform 21 positioned in the same level as the upper surface of the annular frame 1. A first end of the entry platform 21 is hingedly attached to the entrance unit 20 and a second end of the entry platform 21 is free and extends until the flight area 2. The entrance unit 20 further comprises a belt 22 attached to the second end of the entry platform 21 and the belt 22 covers the surface of the entrance unit 20 that is exposed to the flight area 2 or vertical wind tunnel where a vertical air flow is guided. The belt 22 further extends into the entrance unit 20 by bending around a roller 24 that is disposed in a lower part of the entrance unit 20. The entrance unit 20 further comprises a resilient member 23 with one end thereof attached to the belt 22 and with another end thereof attached to the entrance unit 20 so that the belt 22 is kept tensioned when the entry platform 21 is hingedly moved downwards, when a user of the vertical wind tunnel walks in or out from the flight area 2 via the entry platform 21.

[0031] In another embodiment (see FIG. 8) the entrance unit 20 comprises an entry platform 21 positioned in the same level as the upper surface of the annular frame 1. The first end of the entry platform 21 is hingedly attached to the entrance unit 20 by means of a hinge 35 and a second end of the entry platform 21 is free and extends up to the flight area 2. The entrance unit 20 instead of the belt 20, as described in aforementioned embodiment, comprises first plate 30 and a second plate 31 hingedly attached to each other by a hinge 32. The first plate 30 is hingedly attached to the second end of the entry platform 21 by means of an upper hinge 34 and the second plate 31 is attached lower surface of the entrance unit 20 or the annular frame 1 by means of a lower hinge 33. Both plates 30 and 31 cover the surface of the entrance unit 20 that is exposed to the flight area 2. The entrance unit 20 further comprises a resilient member 23 with one end thereof attached to the hinge 32 and with another end thereof attached to the entrance unit 20 or the annular frame 1 so that the plates 30 and 31 are folded when the entry platform 21 is hingedly moved downwards towards the lower surface of the annular frame 1, when a user of the vertical wind tunnel walks in or out from the flight area 2. For ease of understanding rotations of elements around their respective hinges a illustrated in FIG. 8 with bullets.

[0032] The invention has been described with reference to various specific and illustrative embodiments and techniques. However, one skilled in the art will recognize that many variations and modifications may be made while remaining within the scope of the invention as defined in the appended claims.