| 摘要 |
For the release of each sliding longitudinal side strut (7,8) a rotatable element (25) is provided and rotates around the strut's longitudinal axis. The rotatable element is in communication with a pull rod coupled to a locking element. The rotatable element has a helix upon which runs one, or preferably two, rollers connected to the pull element. A transverse pin is provided on the end of the pull element extending inside the side strut and passes through an elongated slot in the strut, and with the rollers located on the ends of the pin. |
