| 摘要 |
An improved energy absorbing seat frame structure (10) for an aircraft seat has leg structures which comprise a pair of generally U-shaped front and rear leg members (34, 36) which are joined back to back in a generally X-shaped configuration. A curved die member (44) is held in contact with the forward facing concave portion of the front leg member (34) by a strap member (48) which surrounds the rear leg member (36). In a crash situation, the front leg can bend about the die member (44) to lower the centre of gravity. In a preferred embodiment, strap type clamps (54) on the upper ends of each leg member permit the leg members to rotate relative to tubular stretcher members(14, 16) of the seat. The ability of the front leg members to be deformed downwardly permits a portion of the excess loading on one front leg member to be transferred through the front stretcher member (14) to the other leg member which is less heavily loaded. Pin joint connections of each leg member to front and rear track fittings (24, 28) enables the structure to accommodate, and to uniformly transfer, loading to seat tracks (26) which have been deformed vertically. A modified fitting (see Figure 8) also accommodates twisting deformation of the seat tracks. The seat can have its front and rear legs positioned closer together than conventional seats for a given "G" loading, so as to increase passenger leg room behind the seat. Alternatively, for a given front to rear leg spacing distance, the "G" loading capacity of a particular seat can be significantly increased without increasing the loading on the seat tracks. |
