Patent ID: 7681658

Claim:
A pneumatic impact tool comprising a housing defining a longitudinal passageway with a front end and a rear end, an accumulation chamber in fluid communication with the longitudinal passageway proximate to the rear end, an accumulation chamber gas port in fluid communication with the accumulation chamber and connectable to a pressurized fluid supply, a passageway gas port in fluid communication with the longitudinal passageway proximate to the rear end, and at least one inner gas port extending between the accumulation chamber and the longitudinal passageway; and a piston inserted in the longitudinal passageway and movable between an impact position wherein the piston is proximate to the front end and a rest position wherein the piston is proximate to the rear end, the piston having a rear face, a front face, opposed to the rear face, and a peripheral wall extending between the front and the rear faces, the peripheral wall of the piston preventing fluid communication between the longitudinal passageway and the accumulation chamber through the at least one inner gas port and the passageway gas port being in fluid communication with the longitudinal passageway, rearwardly of the piston, in the rest position of the piston, and the longitudinal passageway and the accumulation chamber being in fluid communication, in the impact position of the piston.