| 摘要 |
A gate opening device for shifting a gate from a closed position to an open position on loss of power to a motive device includes a housing, the motive device carried by the housing, and a drive shaft coupled to and rotatable by the motive device. A drive member is coupled to the drive shaft and capable of being connected to a gate for causing shifting movement thereof. A base plate is coupled to the drive shaft and a drive plate is coupled to the drive member and pivotally coupled to the base plate. A shear pin engages the drive plate and the base plate, preventing relative pivoting thereof. The shear pin is formed of a material which allows a shearing effect on a specified torque or force, causing the shear pin to break or shear and allow relative pivotal movement of the drive plate and the base plate.
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