We claim:
1. A hydroponic conduit comprising a dimensionally stable elongate member having at least one opening formed therein through which a plant may extend, wherein the elongate member is of substantially elliptical cross-section having an upper surface and a major axis, said at least one opening being formed in the upper surface of said member and wherein the major axis of the substantially elliptical cross-section of said member is substantially horizontal.
2. The conduit as claimed in claim 1, wherein said member has an etched line in the upper surface which functions as a guide to allow openings to be cut into the member.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method of producing a wind turbine blade, comprising:
providing a mould of the desired shape, the mould having a longitudinal direction (L);
laying one or more layers of reinforcement or foam material onto the inner walls of the mould; and
positioning in the desired position the one or more layers of reinforcement or foam material by using one or more devices in order to climb up the inner walls of the mould.
2. The method according to claim 1 further comprising moving at least one of the one or more devices along the longitudinal direction of the mould after placing at least one layer of the one or more layers of reinforcement or foam material.
3. The method according to claim 1, wherein at least one of the one or more devices is oriented in a chordwise direction of the mould.
4. The method according to claim 1, wherein at least one of the one or more devices is placed next to one side of one layer of the one or more layers of reinforcement or foam material.
5. The method according to claim 1, wherein two devices of the one or more devices are used, the two devices being placed at opposite sides of one layer of the one or more layers of fiber or reinforcement material.
6. A device for climbing up an inclined surface comprising:
a flexible support comprising a back face and a front face, said back face of said support being adapted to abut on said surface during operation of said device, said flexible support being adapted to conform to the curvature profile of said surface to be climbed, said flexible support being suitably extended so as to distribute across said surface the weight of an operator climbing up said surface during operation of said device;
fastener for fastening said device so that the position of said device with respect to said surface is substantially constant during operation of said device, said fastener being connected to said support; and
climbing elements firmly fixed to said front face of said flexible support, said climbing elements being adapted to allow a user to climb up or be supported at a predetermined position on said surface.
7. The device according to claim 6, wherein said climbing elements comprise a plurality of steps, each step of said plurality of steps protruding outwards from said front face of said support.
8. The device according to claim 7, wherein at least one step of said plurality of steps comprises a rigid body so that, when the device is in operation, said at least one step is solid and cannot substantially be displaced from its original position by the weight of a user.
9. The device according to claim 7, wherein at least one of said steps comprises a pocket, said pocket being firmly fixed to said front face of said support.
10. The device according to claim 9, wherein said pocket of said at least one step comprises an aperture which can be alternatively closed and opened, said aperture for enabling introduction of a support element into said pocket and extraction of said support element from said pocket.
11. The device according to claim 7, wherein said support is formed so as to be continuous and free from cut-out portions between two consecutive steps of said plurality of steps.
12. The device according to claim 7, wherein said climbing elements comprise a plurality of handles adapted to be held by a user when climbing up said surface.
13. The device according to claim 12, wherein at least one handle of said plurality of handles is located at a position of said front face of said support between two consecutive steps of said plurality of steps.
14. The device according to claim 7, wherein at least one of said climbing elements is integrally formed with said support.
15. The device according to claim 7, wherein said climbing elements comprise a rubber or an elastomer.
16. The device according to claim 7, wherein said surface comprises an upper edge lying above a reference horizontal plane and wherein said fastener is adapted to fasten said device to said upper edge of said inclined surface.
17. The device according to claim 7, wherein said fastener comprises one or more strings, each one of said strings being adapted to be tied to a corresponding strut, the position of each said strut being constant with respect to the position of said inclined surface during operation of said device.
18. The device according to claim 6, wherein said fastener comprises one or more rings, each one of said rings being constrained to slide along a pole, the position of said pole being constant with respect to the position of said inclined surface during operation of said device.
19. The device according to claim 6, wherein said fastener comprises one or more suction pads adapted to be fixed to said inclined surface.
20. The device according to claim 6, wherein said flexible support comprises a rubber or an elastomer.
21. The device according to claim 6, wherein the width of said support is greater than the length of each one of said climbing elements.
22. The device according to claim 6, wherein said support has a width greater than 20 cm andor less than 80 cm.
23. The device according to claim 6, wherein said flexible support comprises a mat.