Electricity: circuit makers and breakers – Snap – Double snap
Patent
1989-10-20
1990-12-18
Scott, J. R.
Electricity: circuit makers and breakers
Snap
Double snap
H01H 500
Patent
active
049788248
ABSTRACT:
In an electrical switch having two stable contact states, e.g., a snap-acting butterfly type switch which includes a spring biased movable actuator mounted in a housing and pivotally engaged by contact carrying arms which are urged together by a tension spring, a fulcrum cooperates with each contact arm during normal operation. During movement of the actuator in a first direction, the contact arms pivot about the fulcrums and the contacts begin to move away from a first stable state. When the horizontal position of the arms is reached, the arms pivot rapidly under influence of the tension spring and the contacts "snap" to the second stable state. During the spring biased return movement of the actuator, the contact arms pivot without contact movement until the horizontal position is passed and snap-action occurs. The switch is characterized by an increased gap between the fixed contact when in the open state and/or by a reduction in the amount of actuator movement required for causing the contacts to move from the open to the closed state.
REFERENCES:
patent: 2526850 (1950-10-01), Charbonneau
patent: 2840657 (1958-06-01), Roeser
patent: 3192329 (1965-06-01), Murrle 200 16 A
Redcliffe Electronics Limited
Scott J. R.
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