| 摘要 |
a guide groove formed in the one rocking member; a movable axis having the one end inserted into the guide groove and the other end; fixed to the other rocking member a push load rotatably connected to the hook of the tracter and the movable axis of the trailer to draw the movable axis by way of torsional stress according to the variations of moving distance; a rotatable axis connected to both brake drums in the front and back of the trailer; a rotatable piece formed in the movable axis; a plurality of links connecting the rotatable axes around the rotatable piece; and a spring connected to the rear rotatable axis and the car member.
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