Importance

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Abstract

A muffler for quieting exhaust expelled from a pneumatic hand tool having a handle and an exhaust passage. The muffler includes an inner tube having a plurality of holes, a number of dividers fixedly and spacedly positioned about the inner tube, and an end cap attachable to the handle for closing off the exhaust passage. At least one of the end cap and the handle including an exit opening. The inner tube has distal and proximal ends and an exterior surface. A cutoff wall is located below at least one airflow opening. The cutoff wall forces exhaust air to exit the inner tube via the at least one airflow opening thereabove. Each divider extends outward from the inner tube exterior surface a distance less than the width of the main section. The combination of the inner tube and dividers are located within the main section. During hand tool use, exhaust air enters the inner tube proximal end, flows out the inner tube holes, moves around the number of dividers, and flows out the exit opening, the cutoff wall forcing exhaust air to exit the inner tube. The tortuous movement of the exhaust air slows it and assists in dampening any attendant noise. Alternative embodiments include an outer tube.

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First Claim