| 摘要 |
A column includes a hinge assembly, the hinge assembly having an upper portion (2) pivotally attached to a lower portion (1) for movement about a first pivot axis (5), the upper portion of the hinge assembly being associated with an upper part (12) of the column and the lower portion of the hinge assembly being associated with a lower part (11) of the column. In use, movement of the upper and lower hinge assembly portions about the first pivot axis from a normal position, in which the upper part of the column is relatively upright, causes the upper part of the column to rotate towards the lower part of the column, thereby allowing the upper part the column to be moved to a maintenance position. An arm links (3), via second (6) and third (7) pivot axes, the upper and lower portions of the hinge assembly, and the arm is associated with a spring (9) that exerts a force via the arm, which urges the upper and lower hinge assembly portions towards the normal position.
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