Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Manually or gravity-operated latch with electromagnetic trip
Patent
1983-08-26
1985-02-26
Goldberg, E. A.
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Manually or gravity-operated latch with electromagnetic trip
335184, 335123, 200 42A, H01H 920
Patent
active
045020302
ABSTRACT:
A fail-safe solenoid switching mechanism (11) includes separate solenoids (17,18) for switchings to "armed" and "safed" statuses. A manually operated safing mechanism (19) has a capability of overriding the solenoids (17,18) to establish the switching mechanism (11) in the "safed" status. The manually operated safing mechanism (19) is operated by a special tool (41), which is retained by the switching mechanism (11) whenever the manually operated safing mechanism (19) is engaged. The manually operated safing mechanism (19) is held in engagement by a catch (22) whenever the solenoid (17) for arming is powered, thereby preventing the specialized tool from being removed and the switching mechanism (11) from inadvertently switching to the "armed" status. Further status indications are provided by a flag (54) which can be used to directly read the status of the switching assembly (11).
The switching assembly (11) uses a reciprocating switch (15) to establish make-or-break connections. In order to increase the effective life of shorting bars on the reciprocating part of the switch, the reciprocating part is rotated by a ratcheting mechanism each time the switch (15) is cycled.
Advantages include enhanced reliability, and positive assurances as to the operating status of the switching assembly.
REFERENCES:
patent: 1789275 (1931-01-01), Howe
patent: 3223802 (1965-12-01), Horst
patent: 3605050 (1971-09-01), Goldman
Allied Corporation
Andrews George
Goldberg E. A.
Protigal Stanley N.
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