| 摘要 |
<p>The frame strut (25) has a tube (26) and an adjacent tubular pipe connector (27) which is extended in the direction of a longitudinal axis of the frame strut and is formed coaxially to the longitudinal axis. The indentations (86) are designed in L-shape or T-shape with a longitudinal support indentation (90) for lateral supporting to the pipe connector of frame strut and with a transverse-center indentation (91) for centering opposite to the pipe connector of the frame strut. The frame strut is made of steel.</p> |
