| 摘要 |
This invention relates to a door or a gate for an enclosure, controlled remotely by a vehicle using an electronic control for moving the door to an open or closed position with a switch for initiating the operation of the control. The invention particularly relates to an improvement for opening and closing the door or gate and essentially includes a light transmission means mounted on the vehicle for generating a light beam, with a first light receiving apparatus mounted in the enclosure for receiving the generated light when the vehicle is clear of the door or gate. When the first light receiver detects the light beam, it either switches the control to close or open the door or gate. A second light receiving apparatus is mounted outside the enclosure in the normal path the vehicle travels while entering or leaving the enclosure. The second light receiving apparatus is mounted in a position to receive the beam of light when the vehicle passes the mounted location. When the second receiving apparatus detects the light beam, the garage door or gate is either closed or opened, depending upon its present position.
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