Importance

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Abstract

A turbine-driven sander includes a minimum of one-piece sealed housing members so interconnected as to form a nozzle, a turbine chamber, and a valve chamber. A plurality of elongated support members are integrally formed on a housing member. Fasteners are inserted in the elongated support members to clamp the housing members together. A flap valve mounted in the valve chamber opens the turbine chamber to a source of vacuum, thereby driving a turbine rotatably mounted in the turbine chamber. This rotation in turn vibrates a platen through a direct-drive system. The platen is supported upon one of the housing members by two platen support members. A noise attenuation system at the front end of the housing includes a two-passage nozzle which is curved to interrupt the line of sight from a turbine air inlet to the turbine. A side branch resonator communicates with the nozzle via noise-attenuating holes in a cover plate located above the nozzle. The nozzle configuration and the resonator coact to attenuate turbine air inlet noise and turbine vane noise.

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First Claim