| 摘要 |
A tractor-trailer fifth wheel is vertically elevatable on a direct acting mechanical movement comprising two links pivotally connected together adjacent their inner ends. The two links also pivot about their outer ends which are longitudinally spaced in the tractor frame. The outer end of one link is linearly movable relative to the outer end of the other link which is stationary. The latter mentioned link rotates about its stationary end. The other link rotates about and moves longitudinally with its outer end, both links hinging upwardly at their inner ends in consequence of longitudinal movement of the one link. The fifth wheel is pivotally mounted on the inner end of the rotational and longitudinally movable link which inner end undergoes a compound nearly straight-line vertical movement owing to the combined movement of the two links.
|
