Abstract: A door having a pneumatic sensing edge is operated automatically to open when an object and the edge make contact An optical pressure switch (10) 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 (10) includes a membrane (16) having a portion that interrupts a light beam (LB) when the membrane (16) flexes due to the increase gas pressure over ambient pressure as gas is forced from the edge.

Abstract: A door having a pneumatic sensing edge is operated automatically to open when an object and the edge make contact An optical pressure switch (10) 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 (10) includes a membrane (16) having a portion that interrupts a light beam (LB) when the membrane (16) flexes due to the increase gas pressure over ambient pressure as gas is forced from the edge

Abstract: A door operating assembly for opening and closing vehicle doors at a constant door edge force includes a frame. A teeter lever assembly is pivotally mounted on the frame and is connected to a connecting rod assembly connecting the teeter lever assembly and the vehicle doors. A cylinder is mounted on the frame and includes a reciprocally mounted rod. The rod is reciprocated by pressurized air introduced into the cylinder. The rod is connected to the teeter lever assembly to rotate the teeter lever assembly. The teeter lever assembly includes a variable diameter cam. A spring for closing the doors is secured at a first end to the frame and at a second end to a flexible connection member. The flexible connection member connects the spring to the cam and wraps around the outer periphery of the cam upon door opening. The energy stored in the spring at full extension is used to close the doors.

Abstract: A system for controlling the kneeling operation of air suspension equipped transit vehicles includes air suspension members (20, 22, 24, 26, 28, 30) mounted at the wheels of the transit vehicle (10) and a fluid reservoir (32). A fluid circuit is included that communicates the reservoir with each of the air suspension members. An exhaust control valve (36) and a fluid flow control valve (150) are included in the circuit at each air suspension member. The system also includes a control valve for the front wheels of the vehicle and a by-pass valve (162) for by-passing the control valve (40) for the front wheels.