Patent ID: 7407530

Claim:
A filter assembly for a pneumatic tool comprising an inner housing; a cover attached to the inner housing and having a connecting portion with an inner space formed on the cover to connect with the pneumatic tool and at least one air passage defined in the cover and communicating with the inner space in the connecting portion, the cover having a connecting tube extending from a bottom of the cover; an inner tube mounted inside the inner housing and defining an annular space between the inner tube and the inner housing to hold filters and/or drying agents inside and communicating with the at least one air passage in the cover; and a connecting post extending into the inner housing and the inner tube, detachably connected with the connecting tube of the cover and having a bottom end, an air channel defined in the bottom end and multiple discharging holes defined in the connecting post and communicating with the air channel in the connecting post and the annular space between the inner tube and the inner housing, wherein the connecting tube of the cover extends into the inner tube and has an inner space communicating with the air channel in the connecting post but kept free from communicating with the at least one air passage in the cover.