| 摘要 |
1,245,811. Air cushion vehicles. BRITISH HOVERCRAFT CORP. Ltd. 8 May, 1969 [8 May, 1968], No. 21689/68. Heading B7K. An air cushion barrier 11 formed at least in part of composite material being of collapsible construction comprises an upper part 15 extending from a line of attachment 13 on the vehicle, a lower part 19 extending from a curved portion 17 inwardly towards the vehicle to terminate in a free edge 14 so that the free edge 14 extends downwardly and outwardly under the action of cushion pressure and the barrier returns to its folded configuration on cessation of the cushion pressure. In one embodiment Fig. 3 a web 21 extends between the lower part 19 and the vehicle to limit downward movement of the free edge 14 and may be flexible or rigid. The upper part 15 and the curved portion 17 have stiffening ribs 16, 18 and the lower part 19 has flutes 20 to enhance its flexibility. The barrier is constructed from composite materials reinforced with glass fibre, woven glass cloth, carbon fibres, or boron fibres. In the case of woven glass higher stiffness is imparted to the upper part 15 by impregnating with polyester resin and the curved portion 17 is impregnated with a self-vulcanizing liquid neoprene solution to impart flexible and resilient properties; spring steel strip or wire may also be employed for this purpose. The lower part 19 is impregnated with epoxy resin for water proofing and in the region of the free edge 14 a polysulphide or liquid neoprene is blended in for greater flexibility. The barrier is preferably constructed of a number of sections which are formed together. |
