G - Physics – 05 – D
Patent
G - Physics
05
D
342/17.2
G05D 3/00 (2006.01) E05F 15/16 (2006.01) E05F 15/00 (2006.01)
Patent
CA 1064146
SWITCH MECHANISM FOR DOOR OPERATOR ABSTRACT OF THE DISCLOSURE An operator for an upwardly acting door. A reversible electric motor is drivingly connected to the door by an inter- mediate drive linkage. A switch assembly is associated with the operator for controlling the upward and downward movement of the door, which switch assembly includes first and second limit switches for deactivating the motor when the door reaches its lowermost and uppermost positions, respectively. A third switch functions as a safety switch for causing reversal in the motor rotation when the driving force exceeds a preselected maximum. Fourth and fifth cut-off switches are respectively positioned adjacent the first and second switches for overriding the third switch when the door is within a preselected dis- tance from its closed or open position. The limit and cut-off switches are controlled by a rotatable screw member having a pair of traveling nuts thereon which coact with a pair of indi- vidually movable control slides. One of the control slides activates the first and fourth switches, and the other control slide activates the second and fifth switches.
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