掣动杆

zhōng zhù yǔ tū kuài xiāng duì yú chè dòng gǎn zhōng xīn chéng piān xīn zhuàng

中柱与凸块相对于掣动杆中心呈偏心状。

The middle column and the projections present an eccentric shape correspondingly to the center of the fixed pawl body.