Machine element or mechanism – Automatic operation or control
Patent
1985-03-18
1986-05-13
Nilson, Robert G.
Machine element or mechanism
Automatic operation or control
137 46, 137318, 251 58, 251 66, F16K 1736
Patent
active
045878595
ABSTRACT:
An apparatus which is provided for closing a fluid valve in response to initial movement, as for example caused by a seismic disturbance, which is removably mountable to existing inline valves, such as gas valves. The apparatus includes a trigger which is responsive to seismic movement, particularly at a resonant frequency, to release a pressurized fluid supply which in turn drives a mechanical actuator to actuate the subject valve through the existing valve coupling. The existing valve coupling is typically a valve stem which must be rotated approximately ninety degrees from an open position to a closed position. The pneumatic drive is sufficiently powerful to actuate valves which are noticeably difficult to actuate manually. The force required to actuate the trigger mechanism is independent of the force required to actuate the valve, in accordance with the invention. In a specific embodiment, the trigger mechanism comprises a weight mounted in an inverted pendular fashion on a coil extension spring which is free to move laterally in all directions in one general plane, the coil extension spring being generally compressed such that lateral movement of the weight results in a limited amount of axial lengthening.
REFERENCES:
patent: 2317982 (1943-05-01), Diehl
patent: 2938461 (1960-05-01), Rabinow
patent: 3649787 (1972-03-01), Kasabian
patent: 3791396 (1974-02-01), Nelson
patent: 4261379 (1981-04-01), Berry
Coombes Graham E.
Lemoine Austin J.
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