jack spring bar
... 推片导板 jack guide plate 推片弹簧杆 jack spring bar 推片起针三角 jack raising cam ...
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其中高拉杆机构拉悬挂的重物改设成拉弹簧以增加安全性，踢腿机构和卧推架机构都是栓挂哑铃片或者是杆铃片。
Among them high bars, a weight of institutions to suspension set to pull to increase the safety of spring, kick institutions and lie push frame agencies are bolts of hang dumbbell or stem of the bell.
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