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US 4,363,227 AGranted
Door lock construction
OwnerJiung-P'eng Loinventor
Life of this patent
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Abstract
An improved door lock construction comprising a lock bolt formed in U-shape operable in association with an actuating mechanism, an interlocking device, a dog device and a hold-release device assembled in a box type housing to be mounted on the inner side of the door, capable of locking the door on closing and further locking with a key.
Claims16
An improved construction of a door lock comprising:
- a lockbolt formed in U shape operable in association with an actuating mechanism having a drive shaft to be driven by the tail piece of a lock cylinder, an inter-locking device operable in cooperation with said actuating mechanism in relation with the movement of said lock bolt to interlock the lock bolt in locking positions, a plurality of compression springs urging said lock bolt forward, an operating handle capable of selectively engaging with and disengaging from said drive shaft, a housing and a cover plate, a dog device comprising a dog plate formed with a trigger piece, said dog plate being urged by a spring to engage with a notch formed in the front end position of the lock bolt when the lockbolt is fully retracted, said trigger piece being adapted to be hit by the jamb to disengage said dog plate from the notch in the lockbolt when the door is closed, to enable the automatic locking of the door on closing, and second locking position setting means for moving said lockbolt into a second locking position, said second position setting means including disengaging means disengaging said operating handle from said drive shaft so that said bolt cannot be operated by said operating handle, jamming means for preventing operation of said bolt by said operating handle, and key means for rotating said drive shaft for moving said bolt into and out of said second locking position.
An improved construction of a door lock, comprising:
- a housing and a cover plate;
- a U-shaped lockbolt slidably mounted in said housing and capable of moving forward to lock the door and retracting to unlock the door, said lockbolt having a pair of bolt members and a cross beam connecting said pair of bolt members, each bolt member having a free end having a notch defined therein;
- an actuating mechanism having a drive shaft operable by a tail piece of a lock cylinder, a drive arm connected to said drive shaft, a connecting link connected to said drive arm and a crank connected to said connecting link, a cam shaft operatively connected to said drive shaft by said crank connecting link and drive arm, said cam shaft being rotatably inserted in said lockbolt cross beam for moving said lockbolt when said drive shaft is rotated;
- an interlocking device operable by said cam shaft to interlock the lockbolt to said housing in a locking position;
- an operating handle mounted on said housing;
- means for selectively engaging said operating handle with and disengaging said operating handle from said drive shaft;
- urging means for resiliently urging said lockbolt toward one end of said housing;
- and
- a dog device mounted on said housing and having a spring and a trigger piece resiliently urged by said spring to engage with said lockbolt notch to latch said lockbolt when said lockbolt is retracted to unlock the door, said trigger piece being positioned to be hit by a jamb of the door to be disengaged from said lockbolt notch when the door is being closed.
6 more elements
Dependencies are inferred from the claim text.