Abstract: A transmission device of an electronic lock, disposed in a lock body, each of both sides of the lock body is provided with a rose assembly, connected respectively to a handle, to drive a driving seat to bring a latch bolt of a latch unit into action. The transmission device is controlled electronically, comprising: a positioning element, a motor, an elastic element, a rod, a clutch element, and a spring. The clutch element is slideable in the spindle, to move between a first position where the clutch element engages with the spindle and a second position where the clutch element disengages from the spindle, such that when the clutch element engages with the spindle, the spindle drives the driving seat, to retract the latch bolt of the latch unit.

Abstract: A transmission device of an electronic lock, disposed in a lock body, each of both sides of the lock body is provided with a rose assembly, connected respectively to a handle, to drive a driving seat to bring a latch bolt of a latch unit into action. The transmission device is controlled electronically, comprising: a positioning element, a motor, an elastic element, a rod, a clutch element, and a spring. The clutch element is slideable in the spindle, to move between a first position where the clutch element engages with the spindle and a second position where the clutch element disengages from the spindle, such that when the clutch element engages with the spindle, the spindle drives the driving seat, to retract the latch bolt of the latch unit.

Abstract: A mortise lock is provided with a reinforcing plate to enhance structural rigidity and robustness for resistance against external destructive pulling forces. The reinforcing plate is disposed in abutment with an exterior cover and a door panel, and is mounted on a mounting post of the exterior cover. The reinforcing plate has a notch to receive and engage a key lock. A securing plate may be disposed between and in abutment with the door panel and a main body of a torsional returning unit which is connected to an exterior handle to further increase structural rigidity.

Abstract: A latch device for an exit device (1) includes a base (20) mounted to a side of a door. A first sliding member (30) is mounted to the base (20) and is movable relative to the base (20) between a first position and a second position. A stop (72) is mounted in a receiving portion (322) of the first sliding member (30) and is pivotable relative to the first sliding member (30) between first and second angular positions. A latch head (60) is mounted to the base (20) and is pivotable relative to the base (20) between a retracted position and in extended position. An abutment portion (725) of the stop (72) in the second angular position is located in a pivotal path of the latch head (60).

Abstract: A transmission device for an exit device for a door includes a base (10) to which a transmission member (4) and a driving member (6) are pivotably mounted. A pushed section (611) of the driving member (6) abuts a push portion (421) of the transmission member (4). A link (7) is movably mounted to the base (10) and is connected to a latch of the exit device. When the transmission member (4) pivots from a first angular position to a second angular position, the push portion (421) of the transmission member (4) pushes the pushed section (611) of the driving member (6) to pivot the driving member (6) from a third angular position to a fourth angular position, and a push section (621) of the driving member (6) pushes a pushed portion (712) of the link (7) to move the link (7) for retracting the latch.

Abstract: A latch-bolt mechanism includes a housing, a latch-bolt, and a drive member. The latch-bolt is movable between an extended position and a retracted position, and includes a bolt body and an engaging member operable to move relative to the bolt body between an engagement position and a disengagement position and having an engaging portion. The drive member has a driving portion. When the engaging member is at the engagement position, the driving portion can be activated to contact and push the engaging portion so as to move the latch-bolt from the extended position to the retracted position. When the engaging member is at the disengagement position, contact between the driving portion and the engaging portion can be prevented.

Abstract: A mortise lock is provided with a reinforcing plate to enhance structural rigidity and robustness for resistance against external destructive pulling forces. The reinforcing plate is disposed in abutment with an exterior cover and a door panel, and is mounted on a mounting post of the exterior cover. The reinforcing plate has a notch to receive and engage a key lock. A securing plate may be disposed between and in abutment with the door panel and a main body of a torsional returning unit which is connected to an exterior handle to further increase structural rigidity.

Abstract: A re-keyable cylinder lock has a control member to permit or restrict transverse movement of a re-keying unit. The control member is movable axially between first and second positions and transversely to a third position from the second position. In the third position, the re-keying unit moves transversely and disengages from first tumbler pieces. A limit member is provided to prevent the control member from moving axially when no right key is inserted into a plug. A security arm is connected to the control member and is breakable so that destructive forces cannot reach the control member.

Abstract: A re-keyable cylinder lock includes a plug inserted into a lock housing and having a plurality of radial holes connected to a key hole. The lock housing has a first engaging element provided in an inner surface thereof. A limit unit has a second engaging element and is inserted into one of the radial holes located at a predetermined depth of the key hole. The first engaging element engages the second engaging element to limit the plug from rotating when a replacement key which is inserted into the key hole for re-keying does not reach a predetermined depth of the key hole. Incomplete re-keying can therefore be prevented.

Abstract: A cylinder lock includes a lock housing receiving a plug assembly that has a key hole, tumbler pieces having respective toothed parts, and a re-keying unit. The re-keying unit has rotatable gear wheels engaged releasably with the respective toothed parts to reposition the respective tumbler pieces. The gear wheels disengage from the respective tooth parts by moving transversely of a longitudinal axis of the lock housing. Re-keying methods are also disclosed.

Abstract: A latch-bolt mechanism includes a housing, a latch-bolt, and a distance-adjusting device. The latch-bolt is movable relative to the housing between an extended position and a retracted position. The distance-adjusting device includes a movable unit movable in the housing between first and second vertical positions and including a first drive member for driving movement of the latch-bolt from the extended position to the retracted position when the movable unit is disposed at either the first or second vertical positions, and a fastener unit for locking the movable unit releaseably at a selected one of the first and second vertical positions.

Abstract: A latch-bolt mechanism includes a housing, a latch-bolt, and a drive member. The latch-bolt is movable between an extended position and a retracted position, and includes a bolt body and an engaging member operable to move relative to the bolt body between an engagement position and a disengagement position and having an engaging portion. The drive member has a driving portion. When the engaging member is at the engagement position, the driving portion can be activated to contact and push the engaging portion so as to move the latch-bolt from the extended position to the retracted position. When the engaging member is at the disengagement position, contact between the driving portion and the engaging portion can be prevented.

Abstract: A re-keyable cylinder lock has a control member to permit or restrict transverse movement of a re-keying unit. The control member is movable axially between first and second positions and transversely to a third position from the second position. In the third position, the re-keying unit moves transversely and disengages from first tumbler pieces. A limit member is provided to prevent the control member from moving axially when no right key is inserted into a plug. A security arm is connected to the control member and is breakable so that destructive forces cannot reach the control member.

Abstract: A re-keyable cylinder lock includes a plug inserted into a lock housing and having a plurality of radial holes connected to a key hole. The lock housing has a first engaging element provided in an inner surface thereof. A limit unit has a second engaging element and is inserted into one of the radial holes located at a predetermined depth of the key hole. The first engaging element engages the second engaging element to limit the plug from rotating when a replacement key which is inserted into the key hole for re-keying does not reach a predetermined depth of the key hole. Incomplete re-keying can therefore be prevented.

Abstract: A cylinder lock includes a lock housing receiving a plug assembly that has a key hole, tumbler pieces having respective toothed parts, and a re-keying unit. The re-keying unit has rotatable gear wheels engaged releasably with the respective toothed parts to reposition the respective tumbler pieces. The gear wheels disengage from the respective tooth parts by moving transversely of a longitudinal axis of the lock housing. Re-keying methods are also disclosed.

Abstract: A door lock assembly includes a cam attached to a handle for rotating a rotary drive in response to rotation of the handle. The rotary drive has a driven part rotated by the cam, and a drive part opposite to the driven part. A latch operator is rotated by the drive part so that a latch operating spindle connected to the latch operator can retract a latch. A slide plate is controlled by a key-operated lock unit to prevent or permit rotation of the cam and the latch operating spindle. The door lock assembly is simple in construction and can be assembled easily.