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A device for unlocking a door locked with a door lock apparatus of a type which is comprised of a latch bolt and a trigger bolt capable of locking the latch bolt and of preventing the latch bolt from being retracted when the door is closed. The unlocking device is mounted on a door frame supporting

A device for unlocking a door locked with a door lock apparatus of a type which is comprised of a latch bolt and a trigger bolt capable of locking the latch bolt and of preventing the latch bolt from being retracted when the door is closed. The unlocking device is mounted on a door frame supporting the door and includes a strike having openings through which the trigger and latch bolts are inserted, and a stopper plate moveable between a service position where it is engaged by the trigger bolt to prevent trigger bolt from protruding from the strike and a non-service position where the trigger bolt is permitted to protrude from the strike so as to release the locking of the latch bolt with the trigger bolt. The stopper plate is moved by a solenoid actuated by remote control. The unlocking device is further provided with a pushing member which moves the latch bolt, which has been released from the trigger bolt, out of the strike, whereby the door may be opened by mere pushing without rotating a door knob.

대표청구항 ▼

In combination with a door supported at one edge by a door frame, said door being locked with a lock apparatus which includes a front plate adapted to be fixed to one side edge of the door; outer and inner door knobs adapted to be secured to outside and inside surfaces of the door, respectively; a l

In combination with a door supported at one edge by a door frame, said door being locked with a lock apparatus which includes a front plate adapted to be fixed to one side edge of the door; outer and inner door knobs adapted to be secured to outside and inside surfaces of the door, respectively; a latch bolt which is adapted to be displaced between a first position where one end portion of the latch bolt is protruded from the front plate and a second position where the latch bolt is retracted therefrom, which is normally urged to be displaced toward the first position and which is coooperable with the inner door knob so that the latch bolt may be displaced to the second position by rotation of the inner door knob; and a trigger bolt which is adapted to be displaced between an extended position where one end portion of the trigger bolt is protruded from the front plate and retracted position where the trigger bolt is retracted therefrom, which is normally urged to be displaced toward the extended position, which is engageable with the latch bolt so that the movement of the latch bolt from the first to second position necessarily causes the movement of the trigger bolt form the extended to retracted position, and which is capable of acting on the latch bolt when the trigger and latch bolts arae in the retracted and first positions, respectively, so that the latch bolt is locked and prevented from being displaced from the first to second position, the locking of the latch bolt with the trigger bolt being released by displacing the trigger bolt to the extended position; a device for unlocking said door comprising: a casing having a strike and adapted to be mounted on the door frame with the strike being flush with the surface of the door frame adjacent to the door; a first opening provided in said strike at a position so that when the door is closed the latch bolt can enter said first opening and can be positioned in said first, protruded position; a second opening provided in said strike at a position so that when the door is closed the trigger bolt can enter said second opening and can be positioned in said extended position; stopper means provided within said casing and adapted to be displaced between a service position where the trigger bolt is engaged by said stopper means and is prevented from entering said second opening and from being positioned in said extended position when the door is closed, and a non-service positon where the trigger bolt is permitted to be psoitioned in said extended position; pushing means provided within said casing, adapted to be displaced between a first location and a second location and capable of displacing the latch bolt which is positioned in said first position to said second position by its movement from said first location to said second location when the door is closed; means for moving said stopper means between said service and non-service positions; and means for moving said pushing means between said first and second locations.