| 摘要 |
Pipes for a telescopic mast have at least three guide grooves along their entire length, this is with the exception of the inner pipe having the smallest cross-sectional area which may not have guide grooves. All pipes except the pipe intended to be the outermost one in the telescopic mast have guide blocks attached to the lowermost portion of their outside. All pipes (4) except the pipe (4) intended to be the innermost one in the telescopic mast have guide blocks attached to the uppermost portion of their inside. |
