Patent ID: 7207116
Filing Date: 2007-04-24
Classification: B23D,Y10T

Abstract:
1. An air saw comprising: a casing; a cylinder in said casing and having a cylinder chamber; a piston movably arranged in said cylinder chamber; a main spindle passing through said piston, said main spindle having a back plate at a rear end of said main spindle and having a front plate at a front end of said main spindle; a front return spring for urging said front plate toward a center of said cylinder; a back return spring for urging said back plate toward said center of said cylinder; a saw blade connected to said front end of said main spindle; an air supply path for supplying air into said cylinder chamber so as to slide said piston within said cylinder chamber to thereby alternately apply the supplied air against pressure-receiving surfaces of said front plate and said back plate so as to reciprocate said main spindle, wherein said cylinder further has a rear air-cushion chamber communicating with said air supply path, said back return spring being arranged in said rear air-cushion chamber, and said cylinder further having a front air-cushion chamber communicating with said air supply path, said front return spring being arranged in said front air-cushion chamber; an exhaust path having an end open to atmosphere, and communicating with said front air-cushion chamber; and a flow-regulating valve arranged in said exhaust path, said flow-regulating valve being operable to regulate a flow of air through said exhaust path so as to adjust a stroke of said saw blade.