Patent ID: 6131390
Filing Date: 2000-10-17
Classification: B25F

Abstract:
A rear exhaust device for pneumatic tool mainly comprising a dynamic body portion and a connection portion perpendicular to said dynamic body portion; outer end of said connection portion furnished with outer threads which to be engaged together with inner threads on one end of a handle; center of a cylinder member having a cylindrical hole for receiving a round conduit; an intake passage of said handle having a valve seat for receiving a control valve to control compressed air to flow through; one end connected with said connection portion of said dynamic body portion, while other end connected with an intake pipe and an outer pipe, and features thereof including:center of said connection portion furnished with a cylinder member which having symmetrical rib plates connected with outer body portion; said cylinder member extended from a seat surface to an O-ring groove outside a cylinder sleeve so as to divide a passage between said cylinder member and said body portion into two exhaust passages; one end of said connection portion outside said body portion furnished with inner threads; a cylindrical hole furnished from a seat surface of said inner threads of said cylinder member; surface of said cylindrical hole furnished with an O-ring and groove; one end of said handle furnished with threads to be engaged with inner threads of said connection portion of said dynamic body portion; center thereof furnished with a round conduit extended from said intake passage of said valve seat; said round conduit having a projected part out of said body portion, and center thereof having an intake passage; a round inner exhaust passage furnished between said round conduit and said body portion; said inner exhaust passage being in direct communication with said exhaust passage of said connection portion; both sides of said valve seat in said handle having two outer exhaust passages respectively and extended backwards; said outer exhaust passage being in communication with said inner exhaust passage outside of said round conduit; outer end of said handle having a connecting cylinder to connect with a pressure-shunting ring, and center thereof furnished with a threaded sleeve to be connected with an intake connector; said handle being in communication with said outer exhaust passage by means of two passages on both sides of said valve seat; a ring-shaped inner exhaust passage being in communication with said outer exhaust passage directly; compressed air flowing via said control valve, and said intake passage, an intake passage of said cylinder member in said connection portion and finally entering said cylinder sleeve, and after said compressed air driving said blades and said rotor, and the same being exhausted to said pressure-shunting ring and said outer pipe connected with tail end of said handle.