Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Multiple contact type
Patent
1994-10-13
1996-03-19
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Multiple contact type
335202, H01H 6702
Patent
active
055006302
ABSTRACT:
A solid state overload relay mechanism designed for minimizing the forces required to open an electrical contact associated therewith in the event of a current overload in a protected circuit, and further designed for overcoming residual magnetism in a solenoid initiating the opening of the contact. The contact includes a pair of stationary contacts supported by a base and a pair of movable contact supported by a contact carrier. A latch defines a notch which is normally engaged with a lever. When so engaged, the contact carrier is positioned such that the movable contacts are in contact with the stationary contacts. When the lever becomes disengaged from the latch, the contact carrier is moved and contact between the movable contacts and stationary contacts is broken. The latch is provided with a counterbalance weight to aid in minimizing the force required to return the latch to its original position after the mechanism is tripped. A latch arm extends away from the latch into the path of the lever such that as the lever travels to its extent in an arcuate path, the lever imparts motion on the latch to return it to its initial position, if such has not already occurred. An auxiliary stationary contact pair is supported by an auxiliary stationary contact housing and may be selectively installed in either a normally closed or a normally open position.
REFERENCES:
patent: 3671891 (1972-06-01), Usui et al.
patent: 4724410 (1988-02-01), Dogenhart
patent: 4899120 (1990-02-01), Ohtake et al.
patent: 5339060 (1994-08-01), Blanchard et al.
Edwards, Jr. Stanley H.
Marshall Richard
Robbins Tony R.
Donovan Lincoln
Golden Larry I.
Square D Company
Stacey David Russell
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