Patent ID: 8215529
Filing Date: 2012-07-10
Classification: B25C

Abstract:
1. An improved pneumatic device, comprising: a body having a hollow cavity, being adapted to define an X axis and having a first end and a second end, the body comprising: a movable cylinder, a nail-firing piston rod, and at least one exhaust hole, wherein the movable cylinder and the nail-firing piston rod are capable of reciprocating along the X axis in the body respectively by performing a forward stroke from the first end to the second end and a return stroke from the second end back to the first end, and the movable cylinder presenting an open status when completing the forward stroke and presenting a closed status when completing the return stroke, the improved pneumatic device being characterized in: the movable cylinder having at least one exhaust hole and at least one exhaust valve disposed at an outer periphery thereof, wherein when the nail-firing piston rod has not completed the return stroke yet and the cylinder is in the closed status, the movable cylinder, close to the exhaust valve and the exhaust hole at the first end, communicates with the exhaust hole disposed near the first end and unparallel to the X axis to form an exhaust channel so as to facilitate exhausting of air; wherein the movable cylinder being disposed in the body, and having a one-way second ring valve, at least one vent hole and an annular rib; the nail-firing piston rod being disposed in and coaxial with the movable cylinder, and adapted to reciprocate along the X axis in the movable cylinder to divide an interior of the movable cylinder into a top cylinder chamber and a bottom cylinder chamber; the improved pneumatic device further having a pair of buffer devices, a plurality of air path structures, a return air chamber, a handle and a trigger device, therein, the pair of buffer devices being disposed near the first end of the body and near the second end of the body respectively to buffer impulsive forces generated by the nail-firing piston rod when moving to the second end and when moving back to the first end; the plurality of air path structures further comprising: a main air chamber being disposed at an inner periphery of the body and having an air channel; an upper air chamber being disposed at the inner periphery of the body and communicating with the air channel; and a middle air chamber being disposed at the inner periphery of the body and communicating with the main air chamber; the return air chamber being disposed at the inner periphery of the body and near the second end, and adapted to store high-pressure air which enters into the return air chamber through the second ring valve when the nail-firing piston rod has moved to the second end but has not started to move towards the first end, and the annular rib being disposed between the upper air chamber and the middle air chamber; the handle defining a Y axis and being connected to the body at an orientation approximately perpendicular to the X axis of the body, and having a hollow cavity, and the main air chamber communicating with the handle; and the trigger device being disposed near the handle, and when the trigger device is depressed, the high-pressure air inside the handle is allowed to flow into the upper air chamber through the trigger device and the air channel.