| 摘要 |
<p>A crashworthy seat suitable for a helicopter, comprises a frame (16) adapted to be secured to the aircraft and supporting a sitting platform (12, 14), having a back (14). The frame has upright members (24) supporting the back of the sitting platform for vertical sliding movement under controlled resistance provided by an energy absorbing mechanism. The energy absorbing mechanism comprises an elongate rib (34) extending along the inner side of each upright member and cooperating cutting or deforming tools carried by the seat back at the sides of the seat back adjoining the upright members and which are incorporated in guides (36) which serve to guide the seat for vertical sliding movement. In the event of a crash in which vertical downward movement of the aircraft is arrested suddenly by impact with the ground, the seat and its occupant are allowed to decelerate more gently by downward sliding movement of the seat relative to the frame whilst the kinetic energy of the seat and occupant is absorbed by paring or deformation of ribs (34) by the cutting or deforming tools. <IMAGE></p> |
