Dresser Industries, Inc.

German Amador

Paul A Biek

A rotary pneumatic tool includes an over-speed shut-off mechanism including a shiftable spring washer and flyweights for imparting a shifting force to the spring washer dependent on the speed of the tool. In the preferred embodiment, the spring washer is shifted by spherical balls restrained by cylindrical walls within a body affixed to the rotor in combination with the spring washer and spring members attached to the body. The spring rates of the spring washer and spring members predetermine the speed at which the over-speed mechanism becomes activated.

Ball and disc over-speed shut-off mechanism for a rotary pneumatic tool

A muffler for reducing the noise level of the air exhaust from a governed pneumatic tool. Exhaust ports in the tool housing communicate with the interior cavity of a muffler body having selectively located port holes for discharging exhaust from the cavity to atmosphere. Contained in the muffler cavity is a foraminous baffle plate centrally supported in the path of discharge between the exhaust ports of the housing and the discharge ports of the muffler body. Extending about the baffle periphery are a plurality of bypass passages defining a flow path parallel to the baffle and sized to accommodate total air flow at maximum capacity.

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Houston, TX, United States of America

German Amador