Title: Pneumatic apparatus

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Abstract: An apparatus is described for driving fasteners or for other impacting applications. The apparatus comprises a cylinder, a piston slidably mounted in the cylinder, a hammer connected to the piston, an air reservoir, an air manifold or supply chamber connected to the air reservoir, a quick-acting poppet valve for rapidly admitting high pressure air on command to the upper end of the cylinder from the air reservoir, a trigger-operated control valve adapted (1) to transmit high pressure air to the poppet valve from the air manifold so as to cause the poppet valve to close off the upper end of the cylinder or (2) to exhaust high pressure air from the poppet valve so as to cause the poppet valve to open, and an exhaust control valve adapted to (1) transmit high pressure air from the air reservoir to the lower end of the cylinder so as to cause the piston to retract the hammer when the poppet valve is closed or (2) to exhaust air from the underside of the piston when the poppet valve is open and high pressure air from the air reservoir causes the piston to drive the hammer through its impact stroke. A safety mechanism is provided to control operation of the exhaust control valve and, as an optional feature, a safety mechanism may be provided to releasably lock the trigger.


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