| 摘要 |
A gate opening system which comprises a barrier mounting (6) adapted to mount a barrier in an open or closed condition, a retention means (16, 17, 18, 19) adapted to secure a barrier in an open or closed condition, a drive element (4), and an energy transmission system (9, 10), whereby energy is transferred from the weight of a vehicle and is in turn transmitted through the transmission system (9, 10) to rotate the drive element (4), causing the barrier mounting (6) to be lifted, the disengagement of the retention means (16, 17, 18, 19), and the barrier thereby opened or closed.
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