20130019531 | Optical pressure switch, door operating system and method - A door having a pneumatic sensing edge is operated automatically to open when an object and the edge make contact. An optical pressure switch in fluid communication with gas forced from the edge on contact with the object initiates the operation of a door opener. The optical pressure switch includes a membrane having a portion that interrupts a light beam when the membrane flexes due to the increase gas pressure over ambient pressure as gas is forced from the edge. | 01-24-2013 |