Patent ID: 7896101
Filing Date: 2011-03-01
Classification: B25B,B25C,Y10T

Abstract:
1. A pneumatically operated power tool comprising: an outer frame having a compressed air intake portion and defining therein a compressed air chamber; driving components disposed in the outer frame and driven by a compressed air in the compressed air chamber; a pressure reduction valve defining a pressure receiving space and allowing a compressed air to flow from the air intake portion to the compressed air chamber and to the pressure receiving space; and a switching valve movable between a first position where the compressed air flows from the compressed air intake portion to the pressure receiving space, and a second position where a communication between the compressed air intake portion and the pressure receiving space is blocked, the pressure reduction valve being configured to set a compressed air pressure in the compressed air chamber to a first pressure level if the switching valve is located at the first position and to set the compressed air pressure to a second pressure level lower than the first pressure level if the switching valve is located at the second position; wherein the pressure reduction valve comprises: a first cylinder section disposed in the compressed air chamber and having a first wall and second wall, an inner diameter of the first wall is larger than an inner diameter of the second wall; a piston disposed in the first cylinder section having a first seal member and a second seal member, an outer diameter of the first seal member is larger than an outer diameter of the second seal member; and wherein the first wall, the second wall, the first seal member, the second seal member, and the piston define the pressure receiving space.