| 摘要 |
The present invention includes a bollard assembly 1 containing an an elongated housing 4 . A bollard 2 is spaced radially inward of the housing 4 and is axially displaceable therein. A threaded drive shaft receiver 32 is centrally fixed within the housing 4 for threaded reception of a threaded drive shaft 30 . The threaded drive shaft 30 is thereby suspended within the housing 4 and threadedly received by the receiver 32 . Upon activation of the drive shaft 30 operably connected to the bollard 2 , rotation of the drive shaft 30 establishes simultaneous vertical displacement of the drive shaft 30 and the bollard 2.
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