Solenoid controlled air tool

A power tool comprising:

• a housing having a fluid supply inlet;
• a fluid operated motor assembly mounted in said housing, said motor assembly including a motor fluid inlet;
• valve means connecting said fluid supply inlet and said motor fluid inlet, said valve means being operable between a first position permitting fluid communication between said fluid supply inlet and said motor fluid inlet and a second position restricting fluid communication between said fluid supply inlet and said motor fluid inlet;
• and
• a positioning device having a chamber including a chamber exhaust valve in a first end and a chamber fluid inlet in a second end;
• a piston disposed in said chamber between said first end and said second end, said piston being slidable in said valve chamber between a first position toward said first end and a second position toward said second end;
• fluid communication means between said chamber first and second ends, said fluid communication means having a smaller cross-section area than said chamber exhaust valve;
• and piston biasing means urging said piston toward said chamber second end and away from said chamber first end, said piston biasing means responsive to a fluid pressure differential between said first and second chamber ends above and below a predetermined level to move said piston into said first and second positions, respectively,
• said positioning device operatively connected to said valve means wherein said positioning device first and second positions correspond to said valve means first and second positions, respectively.