Patent ID: 6550826
Filing Date: 2003-04-22
Classification: E05B,Y10S,Y10T

Abstract:
A door closure apparatus comprising:a door locker selectably operative to engage and disengage a striker and shiftable from a locking state thereof to an unlocked state thereof; a shifter operatively associated with the door locker and operative to effect a shift of the door locker from the locking state to the unlocked state; and a prohibitor operatively associated with the shifter to prohibit a reversal of the shifter and comprising a supply maintaining element selectably operative to maintain a supply of power to a drive of the shifter, and a supply interrupter operative to detect a completion of the shift of the door locker to interrupt the supply of power to the drive; the door locker comprising: a latch mechanism; a first tendency provider operative to provide the latch mechanism with a first tendency to unlatch; and a tendency restricter selectably operative to provide a restriction to the first tendency, whereby the door closure apparatus is operative to have the locking state with the latch mechanism in a latching state, and to have the unlocked state with the latch mechanism in an unlatched state; the shifter comprising a mechanical element operative to interrupt the restriction of the first tendency, in a first position thereof; the drive being operative to drive the mechanical element to the first position; and the prohibitor being operative to prohibit a stop after startup of the drive; and the drive comprises: a motor; a first circuit operative to supply electric power to the motor; a first switch installed in the first circuit; an actuator operative to actuate the first switch; and a second circuit operative to supply electric power to the actuator; and the supply maintaining element comprising a diode circuit interconnecting a ground end of a node of the first circuit and a power supply end of the actuator of the second circuit, so that the second circuit maintains power to the motor if the first switch interrupts the first circuit.