| 摘要 |
<p>Apparatus for operating swing doors or other members through a predetermined angle in which one member of a linear motor is mounted on a stationary frame extending horizontally above the door, a pin or roller on the door engaging a slot in the moving member of the motor to pivot the door from an open to a closed position and visa versa with limit switches and limit actuators at each end of the stroke of the moving member to cut off and reverse the motor.</p> |
