有曲杆与滑车，还有皮带或紧或松。
本实用新型提出了一种可方便地连接到 不同物体例如皮带、书包带、其他挂带或者金属杆上的自锁挂钩。
The present utility model is characterized by providing a self-lock hook which can attach different objects, such as belts, bag belts and other hitches and metal sticks.
设计校核皮带轮传动、蜗轮蜗杆传动、圆筒、轴承座、导杆等。
Pulley gear, worm gears, cylinder, bearing base and quadrate pole etc were designed and checked.
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