| 摘要 |
The present invention is for an automatic gate opening device where commercial electricity is not economically available. A hydraulic cylinder operated by a bidirectional gear pump moves a cylinder rod which connects to an opening rod. The opening rod is pivotally connected to one end to the gate and on the other end to a stationary location. Due to pivotal connections and a pivotal linkage near the middle of the opening rod, the gate may be opened and closed by the hydraulic cylinder. The hydraulic cylinder is also pivotally mounted. Electronic controls may be operated by a number of different type sensors, including limit switches on the hydraulic cylinder, sensors for detecting the gate location, manual switches or other traditional vehicle approach sensors. Power is provided by a storage battery, which battery can be recharged during daylight hours at a solar panel or by a traditional battery charger.
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