| 摘要 |
An automatic door assembly has a closure or door which is driven across a portal by an operator with automatic control. An extruded plastic retainer strip is screwed to the leading edge of the door. The retainer has two inwardly angled tabs which engage with a safety edge gasket assembly in snap-fit relation. The gasket assembly has an extruded resilient plastic gasket assembly with two legs which are engaged within a generally rigid extruded PVC base. A pneumatic sensing tube is supported on a single rib within the gasket assembly. The tube is connected to a conventional treadle sensor which has a switch responsive to deflection of a diaphragm to signal the door controller to reverse direction of the door when an obstacle is encountered by deflection of the gasket and the attached sensing tube. The safety edge assembly when used with bi-part or overhead doors also serves as a gasket to prevent air or other infiltration past the closure.
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