Gas exhaust silencer

Claim 1

A silencer comprising a housing having a chamber; a sound absorbing material disposed within said chamber; one end of said housing being connected to a source of exhausted air; a first baffle member disposed within said housing adjacent said one end; a second baffle member disposed within said housing adjacent the other end thereof; said first and said second baffle members being permeable to permit penetration of said exhausted air through said first baffle member into said chamber and through said sound abosrbing material for exit through said second baffle member to the atmosphere; said first baffle member being adapted to reduce the noise level of said exhausted air to a first valUe lower than the initial entering value; said sound absorbing material within said chamber being adapted to further reduce the noise level of said exhausted air to a second value lower than said first value; and said second baffle member being adapted to still further reduce the noise level of said exhausted air to a third value lower than said first and second value; said first baffle member being formed in the shape of a truncated cylindrical cone providing an internal gas expansion chamber aligned with said inlet and said second baffle member being formed in the shape of a plate disposed across said other end of said housing.