| 摘要 |
An extensible drawbar device comprises a grip, a draw plate disposed under the grip transversely, two parallel drawbars connected by the draw plate, two fixed plates receiving the drawbars, and two link plates abutting the drawbars. The grip is connected to two upper ends of the drawbars. A groove is formed on the upper portion of each drawbar. Two ends of the draw plate are inserted in the grooves and connected to the upper ends of the link plates. Two compression springs are disposed between the grip and the draw plate. Caging recesses are formed on the draw plate. A through hole is formed on the grip to receive a push button. The lower end of the push button stably connects a caging block. The lower end of the link plate has a generally ladder-shaped plate which has a first and second steps, a bevel, and a slot. A caging hole is formed at the lower portion of the drawbar. Positioning holes are formed on the upper portion of the fixed plate. A positioning stopper which is restrained by a spring is inserted in the caging hole and the positioning hole.
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