| 摘要 |
<p>The spring structure comprises an additional spring (iii) whose flange (x) is located between the spring plate (i) and the flange (xi) of the protector pipe (iv) between the helical and additional springs (ii, iii). The flanges (x, xi) of the protector pipe and the additional spring are clamped between the helical spring and the spring plate.</p> |
