| 摘要 |
The present invention relates to a special platform device making it possible to control the entry or exit to or from a private property. This device, placed in a pit suited to its overall size, at the entrance or at the exit, is made up of a metal framing or portal frame 1 in which is housed the whole working device, hydraulic, pneumatic, double or single action jacks, especially controlled by an electrical power plant and associated with various linking apparatuses such as push buttons, radio control, magnetic loops, etc. The floors are mounted in a tilting manner, while steel spikes penetrate into tyres. <IMAGE>
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