Filter for a pneumatic tool

A pneumatic tool particularly a nailing machine comprising:

• a tool body having a cylinder and a piston reciprocally moved by a force of compressed air from an air supply source which is applied to said cylinder to drive a nail;
• a hollow handle integrally formed with said tool body, said hollow handle having a longitudinal axis and a cross-sectional area substantially perpendicular to said longitudinal axis, said hollow handle having an open bottom and a peripheral wall wherein said open bottom extends substantially across the entire cross-sectional area of a bottom portion of said hollow handle;
• a cup-shaped closure means for closing the open bottom of said hollow handle and shaped complementarily to said hollow handle open bottom, said cup-shaped closure means having a cross-sectional area of substantially the same size as a bottom portion of said hollow handle and including a joint fixed to an inlet port formed on said cup-shaped closure means for connecting said air supply source;
• and
• a filter means for filtering said compressed air from said air supply source extending entirely across said hollow handle open bottom and secured between said hollow handle and said cup-shaped closure means;
• said hollow handle and cup-shaped closure means defining a chamber for storing a volume of compressed air and said filter means separating said chamber into a small volume section for prefiltered air and a relatively large volume section for filtered air.