| 摘要 |
<p>The support (10) has two telescopic supporting elements (12,14) moved along height direction. A spring element is provided inside supporting elements to bias supporting element height in upper end position and is extended along longitudinal direction. An outer pipe (40) is extended inside supporting element. An inner pipe (56) is provided inside outer pipe. The lower ends (48,58) of outer and inner pipes are supported on base plate (60) of supporting elements. A pressure spring (62) of spring element is clamped in outer pipe between inner pipe and receiving element (46).</p> |
