箱型伸缩臂； 伸缩机构； 无销式； 单缸插销式；
Box section telescopic boom; Telescopic mechanism; Pinless boom; Single cylinder pin type;
该实用新型的特点是：活动的内层箱箱板通过链片和销轴与外层箱铰接成双层箱。
The utility model is characterized in that the box board of a movable inner layer box is hinged with an outer layer box to form a double-layer box through a chain piece and a pin shaft.
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