Overspeed safety device

Details Overspeed safety device Overspeed safety device

2005-05-31

2005-05-31

Look, Edward K. (Department: 3745)

Rotary kinetic fluid motors or pumps

With control means responsive to non-cyclic condition...

Centrifugally initiated valve controlling fluid flow in...

C415S041000, C415S042000, C415S904000, C137S050000, C137S053000, C137S057000

Reexamination Certificate

active

06899514

ABSTRACT:
An overspeed safety device for a pneumatic rotation motor having a stator (10) with an air inlet passage (16), a rotor (12), and a speed governor for determining a maximum speed level, and comprising a speed responsive actuator (34) connected to the rotor (12) and a valve (33) shiftable by the actuator (34) from a normally open position to a closed position so as to block or substantially restrict the air flow through the inlet passage (16) at the attainment of motor speed levels exceeding a predetermined maximum level should the speed governor malfunction, wherein the actuator (34) comprises a spring biassed contact element (48) connected to the rotor (12) and responsive to centrifugal action, and the valve (33) comprises a disc-shaped valve element (36) pivotally supported in the inlet passage (16) and maintained in its open position by one magnet (42) and in its closed position by another magnet (43).

REFERENCES:
patent: 4278103 (1981-07-01), Giardino
patent: 4298317 (1981-11-01), Hansson
patent: 6179552 (2001-01-01), Jacobsson

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