| 摘要 |
A gate operator for lifting a gate (12) about a horizontal axis at a lower proximate corner thereof to vertically raise and lower the gate (12) in a generally 90 degree arc in the plane of the gate (12) by using a fractional horsepower motor (34) and an energy accumulator (58), which can be a torsion motor, a pneumatic mechanism or an enclosed spring mechanism. The motor (34) is only used to initiate movement in the upward and downward cycles of the gate (12) and to regulate the speed of the gate (12) by damping the release of accumulated energy (58). A drive mechanism connects the motor (34) to the energy accumulator (58). Energy is stored to the energy accumulator (58) during the downward movement of the gate (12) and released during the upward movement of the gate (12) to reduce the amount of power required to operate the gate (12). The stored energy in the energy accumulator balances the gate (12) such that it is held in a virtual weightless condition in all positions of its arcuate movement, allowing the gate to be moved from or to its open or closed position with a minimal amount of energy. The drive mechanism locks the gate (12) in its open vertical position and in its closed horizontal position.
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