| 摘要 |
A door comprises a number of sections telescoping into each other in the vertical direction. Each section has a base portion and downwardly directed legs which, in the open position of the door, incline inwardly towards each other and, in the closed position of the door, in a substantially parallel position abut the upper portions of the legs of the section underneath. Members such as rollers facilitating the relative movement between the sections are mounted on the lower part of the inside of the legs and are supported at a distance above the lower edge of the sections so that, in the closed position of the door, they are above the base portion of the section underneath. The lowest section is provided with rollers engaging the door frame and an upwardly directed centering pin which, in the open position of the door, passes through recesses in the base portions of the sections above.
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