Patent ID: 6935219
Filing Date: 2005-08-30
Classification: B65G

Abstract:
1. An actuator comprising a cylinder housing having a top and a bottom and a cylinder cap attached to the top of the cylinder housing, the cylinder cap defining a central bore; a first piston disposed within the cylinder housing comprising a first piston stem that is received within the central bore; a second piston disposed within the cylinder housing comprising a second piston stem, the second piston stem capable of contacting the first piston, wherein the first and second pistons divide the cylinder housing into a first chamber, a second chamber and a third chamber; a valve attached to an end of the cylinder housing, the valve comprising an input, an output and a valve stem wherein the valve stem contacts and is capable of being operated by the second piston to block airflow from the input to the output; and an air inlet within the cylinder housing which communicates with the second chamber when the first piston is forced to the top of the cylinder housing and the second piston is forced to the bottom of the cylinder housing.