US Patent 9127423 Bollards

A telescopic bollard comprising: a bollard assembly, the bollard assembly including an outer bollard part defining a guide bore extending in a direction along the axis thereof from a base end to a head end thereof. An inner bollard part is housed within the guide bore so as to be slidingly moveable therealong between: a telescopically retracted state in at least some of the length of the inner bollard part resides within the guide bore, and a telescopically extended state in which relatively less of the length of the inner bollard part resides within the guide bore and relatively more of said length extends beyond the head end of the outer bollard part.