| 摘要 |
<p>A vehicle restraint comprises an elongate housing (10) in which a rod (12), captive to axial movement, is journalled in supports (14) for rotational movement. The rod (12) has a screw-threaded portion. Power means are provided at one end of the rod (12) to impart, when energised, rotational movement to the rod (12). A sleeve (22) has a tapped portion (23) carried in threaded engagement on the rod (12) and movable along the rod (12) on rotation thereof. The sleeve (22) has diametrically opposed bearing pins (24). A cam (34) has two walls (36) of substantial parallelogram shape with each wall (36) having a slot (38) at or near the transition between two adjacent sides (40) having an obtuse angle therebetween. The walls (40) are positioned one on each side of the sleeve (22) with the pins (24) entering respective slots (38) in the walls (40). The connection of the cam (34) to the sleeve (22) is rearward in each direction of travel. A restraint lever arm (46) is fast with the cam (34) and extends laterally from the housing (10). <IMAGE></p> |
