Electricity: circuit makers and breakers – Multiple circuit control – Pivoted contact
Patent
1975-01-31
1976-10-05
Scott, James R.
Electricity: circuit makers and breakers
Multiple circuit control
Pivoted contact
200153T, 219 1055C, 317135R, H02H 300
Patent
active
039847330
ABSTRACT:
An interlock switch assembly is provided to prevent the application of electrical power to an X-ray unit when the access port or door is opened. The interlock switch includes two microswitches connected in series. The microswitches are actuated when the door is closed by a plunger mounted in the door which moves against a pair of spaced electrically conductive spring contact strips, and moves the strips against the actuator buttons of the microswitches. The plunger includes a pair of contact posts which establish electrical connection with the strips as the plunger is moved against the strips, and an electrical shunt is provided across the posts so that when the plunger contacts the strips, an electrical connection is provided from one strip to the other. The switch assembly provides electrical switching without arcing when the door is opened and closed under normal conditions. The interlock switch also assures that contact will be broken to the X-ray unit, even in the event that the power relay is welded into a closed condition, this being due to the fact that the plunger physically breaks the electrical connection between the contact strips, in addition to actuating the microswitches, when the door is opened.
REFERENCES:
patent: 2895083 (1959-07-01), Quinlan
patent: 3105130 (1963-09-01), Weiford, Jr.
patent: 3329795 (1967-07-01), Long
patent: 3480753 (1969-11-01), Wilson et al.
patent: 3699300 (1972-10-01), Buerki
patent: 3816688 (1974-06-01), Fritts
patent: 3857067 (1974-12-01), Zanboorie
patent: 3865097 (1975-02-01), Robinson
Beecher Keith D.
Scott James R.
Torr Laboratories, Inc.
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