| 摘要 |
A security device ( 2 ) is described for protection access to and from a parking space by being suitable for secure mounting to the entrance/exit of the parking space at ground level comprising a barrier or sign ( 9 ) capable of movement between a raised position for preventing movement of a vehicle past the barrier ( 9 ) and a lowered position permitting the vehicle to be driven over the device ( 2 ), and arming pedal ( 4 ) which is depressed when the vehicle is driven over the device ( 2 ) to energize a driving means in the form of a torsion spring ( 78 ) which is connected via a control means including a cam ( 40 ) having two cam lobes ( 42,44 ) for effecting movement of a bar ( 60 ), to the barrier ( 9 ) by a suitable connection means, such as for example a slotted wheel ( 84 ) and pulley arrangement, so that operation of the control means causes lower or raising of the barrier.
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