Valves and valve actuation – Biased trip – With second diverse control
Patent
1996-11-26
1999-03-30
Fox, John
Valves and valve actuation
Biased trip
With second diverse control
137 77, F16K 3164
Patent
active
058878491
ABSTRACT:
A thermal release coupler is provided for use in a fire and smoke damper assembly. The fire and smoke damper assembly includes an array of damper blades carried in a damper frame which are moveable between open and closed positions; a linkage joining the damper blades; and a damper actuator operatively connected to the linkage for driving the damper blade array between the open and closed positions. The thermal release coupler has a drive shaft coupled to the damper actuator and a connecting shaft coupled to the damper blade linkage and rotatably coupled to the drive shaft. A drive coupler and a connecting coupler, each being secured to and carried on the drive shaft and the connecting shaft, respectively, are maintained in fixed relationship by a linking member which has a first fixed state and a second free state. A bias member is coupled to the drive coupler and the connecting coupler such that the bias member exerts a torque on the connecting coupler urging the damper blades to the closed position when the linking means is in the second state.
REFERENCES:
patent: 2242738 (1941-05-01), Alton
patent: 3538929 (1970-11-01), Botkin
patent: 3633600 (1972-01-01), Sadamori
Holmes, Jr. Samuel W.
Kandasamy Ganeson
Fox John
Johnson Service Company
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