Abstract A miniature annunciator to be mounted on a control panel for determining the status of circuit conditions, remote machine operation, and general supervision has a housing in which is mounted a field reversible coil having at its each end a laterally extending pole piece. Pivoted within such housing on a shaft which extends outwardly from such housing is a permanently magnetized rotor. The axis of the shaft is located centrally between the two pole pieces and is approximately perpendicular to the flux path between the two pole pieces. The housing is provided with a flange by which it is held to the back of the control panel with the shaft extending through the panel. When the polarity of the coil is reversed, the rotor will be angularly moved approximately 90* from a position at one stop to a position at a second stop. The energizing of the coil is done by pulses and when the coil is de-energized, the permanent magnetism in the rotor will help keep it in the position attained by the energization of the coil. That part of the shaft protruding from the face of the panel is provided with a visible member, such as a bar, which is moved from a generally horizontal to a generally vertical position to indicate the condition of circuitry which is also variable on the face of the panel.
A magnetic annunciator adapted to be mounted on a control panel comprising: a. a housing having an interior pocket with inwardly extending projections and a face for flatly resting on a side of the control panel; b. a field reversible coil mounted on said housing and having radially extending pole pieces, said coil and pole pieces assembly frictionally fitted in said pocket; c. a shaft pivoted in said housing, having a permanently magnetized disc-like rotor thereon in the flux path between and continuingly radially spaced from said pole pieces, said rotor having diametrically positioned oppositely magnetized poles, said shaft having a portion extending exteriorly of said housing; d. stop means in said pocket limiting the angular swing of said shaft to stop said rotor with the poles on said rotor aligned with the poles on said pole pieces in one position upon D.C. pulse in one direction and with the poles on said rotor at approximately a 90* angle with respect to the poles on said pole pieces when said coil is subjected to a D.C. pulse in an opposite direction, both of such positions being maintained after collapse of the respective D.C. pulses; and e. a visible member carried by said portion to indicate the position of said magnetized rotor with respect to said pole pieces.
Claim 2
Dependent Claim
217 words
A magnetic annunciator adapted to be mounted on a control panel comprising: a. a housing having an interior pocket with inwardly extending projections and a face for flatly resting on a side of the control panel; b. a field reversible coil mounted on said housing and having radially extending pole pieces, said coil and pole pieces assembly frictionally fitted in said pocket; c. a shaft pivoted in said housing, having a permanently magnetized disc-like rotor thereon in the flux path between and continuingly radially spaced from said pole pieces, said rotor having diametrically positioned oppositely magnetized poles, said shaft having a portion extending exteriorly of said housing; d. stop means in said pocket limiting the angular swing of said shaft to stop said rotor with the poles on said rotor aligned with the poles on said pole pieces in one position upon D.C. pulse in one direction and with the poles on said rotor at approximately a 90* angle with respect to the poles on said pole pieces when said coil is subjected to a D.C. pulse in an opposite direction, both of such positions being maintained after collapse of the respective D.C. pulses; and e. a visible member carried by said portion to indicate the position of said magnetized rotor with respect to said pole pieces.
Claim 3
Dependent Claim
19 words
A magnetic annuciator as defined in claim 1 wherein: said visible member is positioned exteriorly of the control panel.
Claim 4
Dependent Claim
36 words
A magnetic annunciator as defined in claim 2 wherein: said visible member is a bar which has a horizontal position to indicate a closed circuit condition and a vertical position to indicate an open circuit condition.