Patent ID: 6530435
Filing Date: 2003-03-11
Classification: B44B

Abstract:
A handheld pneumatic power tool apparatus for use with a supply of pressurized air, the apparatus comprising:a handpiece having a first end and a second end; a cylindrical cavity within said handpiece, the cylindrical cavity having a central longitudinal axis; a piston received in said cylindrical cavity and being shiftable relative to said handpiece along said central longitudinal axis; an oscillation means by which said piston will oscillate back and forth a distance within said cylindrical cavity and along said central longitudinal axis under the action of said supply of pressurized air; a first air flow delivery means for delivering air flow to said handpiece, said first air flow delivery means including a foot-operated air flow valve that includes an inlet port in communication with supply of pressurized air and an outlet port in communication to said handpiece; said foot-operated air flow valve is movable between an off position in which the air flowing through said foot-operated air flow valve is zero and a number of on positions; a second adjustable air flow delivery means for delivering air flow to said handpiece to permit said oscillation means to function when said foot operated air flow valve is in the off, zero flow position; said second adjustable air flow delivery means includes an additional flow control valve in communication with said supply of pressurized air and said handpiece; said additional flow control valve is adjustable between an off position in which the air flow is zero and a number of on positions; said second adjustable air flow delivery means is independent from said first air flow delivery means and is not adjusted by said foot-operated air flow valve; a manual means for the user of the said handheld pneumatic power tool apparatus to manually adjust said second adjustable air flow delivery means, and an idle-impact means for said piston to oscillate without delivering collision impacts against said first end and for said piston to oscillate with varying amount of impact collision energy against said first end.