Bollard comprises hollow stand and upper section which can be raised or lowered back into the stand and comprises top containing reservoir for hydraulic fluid, drive unit and control unit, hydraulic cylinder connecting base to upper section

摘要

The bollard for blocking thoroughfares comprises a hollow stand (20) and an upper section (30) which can be raised or lowered back into the stand using an electrically controlled hydraulic system. The upper section comprises a top (33) containing separate chambers (35, 36), a reservoir (45) for hydraulic fluid, a drive unit (44) and a control unit (43). A hydraulic cylinder (55) connects the base of the stand to the bottom of the upper section,