ratchetn.棘轮；棘齿v.（使）渐进=rachet.ratchet lever jack轮杠千斤顶,棘轮杠杆千斤顶,蜗轮蜗杆千斤顶ratchet gear wheel棘齿轮ratchet cyclometer带有棘轮转数表ratchet J-Horner棘轮起重器ratchet wheel ring大钢轮衬圈ratchet type crank棘轮型曲柄ratchet mechanisms棘轮机构ratchet cover plate棘轮盘,棘轮盖板ratchet wheel screw大钢轮螺钉ratchet arrangement棘轮装置