Patent ID: 8931678
Filing Date: 2015-01-13
Classification: B25C

Abstract:
1. A pneumatic tool comprising: a body; a pneumatic driving unit disposed in said body for performing pneumatically a fastener-driving operation; a trigger valve unit disposed on said body and adapted for controlling flow of air into said pneumatic driving unit and out of said body; and a passage unit formed in said body and including an air storing chamber adapted for guiding flow of air into said trigger valve unit, a bidirectional passage for intercommunicating said trigger valve unit and said pneumatic driving unit, an exhaust passage communicated with said trigger valve unit, and a U-shaped expansion passage adapted for intercommunicating said exhaust passage and the atmosphere and extending along a peripheral portion of said body, said expansion passage being adapted to permit flow of air from said exhaust passage into the atmosphere therethrough, said bidirectional passage being adapted for permitting flow of air between said trigger valve unit and said pneumatic driving unit therethrough in opposite directions.