Motors: expansible chamber type – Working member position responsive motive fluid control – Working member carries part within working chamber which...
Patent
1985-08-12
1988-07-26
Hershkovitz, Abraham
Motors: expansible chamber type
Working member position responsive motive fluid control
Working member carries part within working chamber which...
91416, 91533, 92134, 92151, 92152, F15B 1522
Patent
active
047592605
ABSTRACT:
This invention relates to a fail-safe or auto-return actuator cylinder employing the air spring effect provided by compressed air trapped in an air-spring compartment; which air spring effect replaces the conventional mechanical coil spring employed in conventional fail safe or auto-return air cylinders. The air spring chamber integrally built into the cylinder body is connected to the compressed air supply tube through a check valve that provides the self-charging and self-recharging feature for the air-spring chamber and, consequently, the air-spring chamber remains fully charged with compressed air even when there is a compressed air leak from the air-spring chamber. The air-spring compartment stays charged or becomes automatically recharged even when there is a leak from the air-spring compartment as long as there is compressed air to actuate the cylinder. If there is no compressed air to recharge the air-spring compartment automatically when there is a leak from the air-spring compartment, the cylinder remains at the fail safe position because there is no compressed air to actuate it. Therefore the auto-return feature of the actuator cylinder to the fail-safe position is guaranteed for all instances under all circumstances where there is a failure in the compressed air supply system.
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