Patent ID: 8746527

Claim:
A pneumatic nailer for use with a fluid source, comprising: a housing defining a storage chamber configured for fluid communication with the fluid source; a cylinder having a sleeve, an actuating structure fixed to said sleeve, a first valve assembly carried by said sleeve, and at least one port defined in said sleeve, said cylinder configured for movement with respect to said housing between a first cylinder position and a second cylinder position, an inner side of said sleeve defining a sleeve chamber, an outer side of said sleeve and said housing defining an actuating chamber therebetween on a first side of said actuating structure, and said first valve assembly configured to (i) to allow fluid flow from said sleeve chamber to said actuating chamber and (ii) to prevent fluid flow from said actuating chamber to said sleeve chamber; a piston having a piston head and a driver member extending from said piston head, said piston head being movable within said sleeve chamber between a first piston position and a second piston position, said sleeve and said piston head defining (i) a displacement chamber on a first side of said piston head and (ii) a return chamber on an opposite side of said piston head, said at least one port configured and arranged (i) to fluidly couple said return chamber to said return chamber to said actuating chamber when said cylinder is in said first cylinder position and (ii) to fluidly couple said return chamber to atmosphere when said cylinder is in said second cylinder position; and a second valve assembly at least partially positioned within said housing and moveable between a first valve position and a second valve position, said second valve assembly configured (i) to fluidly couple said displacement chamber to atmosphere when said second valve assembly is in said first valve position and (ii) to isolate said displacement chamber from atmosphere when said second valve assembly is in said second valve position; and an actuator positionable between an actuated position and a deactuated position and configured such that (i) when said actuator is moved from said deactuated position to said actuated position said second valve assembly is caused to move from said first valve position to said second valve position and (ii) when said actuator is moved from said actuated position to said deactuated position said second valve assembly is caused to move from said second valve position to said first valve position.