| 摘要 |
An improved pneumatically operated fastener driving device comprising an actuating assembly (26) mounted with respect to a housing assembly (28) and movable from an inoperative position to an operative position. A first sealing element (110) is mounted with respect to a feed path. The first sealing element moves from a sealed position, wherein it prevents communication between an air pressure reservoir (18) and a control pressure chamber (54) when the actuating assembly (26) is in the operative position, and an unsealed position, wherein the first sealing element (110) permits such communication to move a main valve (36) to a closed position when the actuating assembly (26) is in the inoperative position. A biasing element (88) is operatively associated with the second sealing element (84) and biases the second sealing element towards its unsealed position to maintain communication of the control pressure chamber (54) with the atmosphere until the first sealing element (110) has moved to its unsealed position.
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