| 摘要 |
A vehicle access control bollard for path entryways and restricted drives which allows access for approved vehicles through the use of a self-contained interior lowering mechanism. The three-piece bollard comprises a lower section which is concreted below grade, an intermediate section which houses the interior slip-fit hinge lowering assembly, and an upper section that stands vertically or can be lowered to an approximately four and one-half to five inch clearance height to allow approved vehicles to pass over. There are no exterior hinges, locks, or bolts, thereby giving the appearance of a single permanent non-movable bollard.
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