Pneumatically operated fastener driving device with improved main valve assembly

摘要

A pneumatically operated fastener driving device having an improved main valve assembly including separate inlet and outlet valve structures and a spring operatively connected with the inlet and outlet valve structures for effecting (1) a movement of the outlet valve structure from the open position thereof to the closed position thereof simultaneously with a movement of the inlet valve structure from the closed position thereof to the open position thereof; and (2) a movement of the outlet valve structure from the closed position thereof to the open position thereof sequentially following a movement of the inlet valve structure from the open position thereof to the closed position thereof.