Atlas Copco Tools Ab

Karl-Johan Lars Elsmark

Gunnar Christer Hansson

Anders Urban Jansson

An overspeed safety device for a pneumatic rotation motor having a stator () with an air inlet passage (), a rotor (), and a speed governor for determining a maximum speed level, and comprising a speed responsive actuator () connected to the rotor () and a valve () shiftable by the actuator () from a normally open position to a closed position so as to block or substantially restrict the air flow through the inlet passage () at the attainment of motor speed levels exceeding a predetermined maximum level should the speed governor malfunction, wherein the actuator () comprises a spring biassed contact element () connected to the rotor () and responsive to centrifugal action, and the valve () comprises a disc-shaped valve element () pivotally supported in the inlet passage () and maintained in its open position by one magnet () and in its closed position by another magnet ().

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Saltsjö-Boo, Sweden

Karl-Johan Lars Elsmark