Pneumatic control system
AssigneeCalifornia Controls Company
InventorRobert A. Bilbrey
Life of this patent
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Abstract
A pneumatic control system is described including a plurality of annunciators in which movable shuttle elements indicate normal and abnormal conditions. In the event an abnormal condition is sensed causing the shuttle element in any of the annunciators to move to the abnormal position, a bias pressure is applied to brake means in the annunciators to lock the position of the shuttle elements which have not moved. Thus, those of the annunciators which are not associated with an abnormal condition continue to indicate the normal condition.
Claims12
A pneumatic control system comprising, a plurality of annunciators, each having a shuttle element therein responsive to a sensed condition to move between a first position at which a sensed normal condition is indicated and a second position at which a sensed abnormal condition is indicated, each of said annunciators having spring means therein biasing said shuttle element toward said second position, each of said annunciators having brake means therein responsive to a bias pressure to retain said shuttle element against movement, and means for applying a bias pressure to all of said brake means upon movement of any one of said shuttle elements from the first position to the second position upon sensing an abnormal condition, whereby those of said annunciators for which a sensed normal condition exists continue to indicate a normal condition.
An annunciator for a pneumatic control system, comprising, a housing, a shuttle element in said housing responsive to a sensed condition to move between a first position at which a sensed normal condition is indicated and a second position at which a sensed abnormal condition is indicated, spring means biasing said shuttle element toward said second position, and brake means responsive to a bias pressure to retain said shuttle element against movement from said first position to said second position.
Dependencies are inferred from the claim text.