A mechanically reprogrammable cylinder lock includes a magnetic tool to provide reprogramming.

A square computer lock includes a square housing, and a lock core, a lock tongue, an unlocking button, a locking button and a latch arranged in the square housing. An insertion hole is formed on the rear side of the square housing. A row of plate tumblers are arranged in a lock core lock hole. A plate tumbler spring is arranged below each plate tumbler. Positioning posts are formed on a lateral surface of the latch. A wedge-shaped plate is formed at a lower end of the unlocking button. An unlocking spring is arranged between the wedge-shaped plate and the bottom of the square housing. The locking button is arranged in the square housing in a front-back movable manner. An upper end of the locking button penetrates in a locking hole in a front-back movable manner.

A plug assembly including a plug, a sidebar movably mounted on the plug, and a plurality of rack pins seated in the plug. The sidebar is biased to an outer position in which the sidebar extends beyond an outer surface of the plug. Each rack pin includes a key-following leg and a sidebar-engaging leg. The sidebar-engaging leg includes at least one true gate. When a true gate of each rack pin is aligned with the sidebar, the sidebar is free to move radially inward to an inner position.

A method for mutually controlling and unlocking a dual plug in a lock, comprising: unlocking a code of a first plug first, the first plug restricting unlocking of a second plug, the second plug restricting rotating of the first plug before the code of the first plug is unlocked; after unlocking the code of the first plug, the first plug translating to a second position from a first position using a preset position difference, the first plug being unable to rotate during the translation; after moving the first plug to the second position, the first plug releasing a restriction on the second plug, the second plug still restricting the rotating of the first plug; and unlocking the code of the second plug, the first plug and the second plug being able to rotate synchronously so as to unlock the lock after unlocking the code of the second plug. The present invention further relates to a lock with a dual plug.

A multi-key lock core includes a housing, a driving cylinder, a plurality of circular lock plates, and a lock rod. The driving cylinder is disposed in the housing, a sidewall of the driving cylinder is provided with a penetration portion, and the driving cylinder is rotatable to the penetration portion to correspond to an engagement recessed portion. The circular lock plates are disposed in the driving cylinder and each include an outer edge provided with a first recessed portion, and the outer edge of at least one of the circular lock plates is further provided with a second recessed portion. The lock rod is disposed in the penetration portion, and may partially enter the engagement recessed portion to restrict rotation of the driving cylinder. A first key may push the circular lock plates to rotate to the first recessed portion to correspond to the penetration portion, so that the lock rod can move to partially enter the first recessed portion and detach from the engagement recessed portion. The second key may push the circular lock plates to rotate to the second recessed portion and the first recessed portion to correspond to the penetration portion, so that the lock rod can move to partially enter the second recessed portion and the first recessed portion and detach from the engagement recessed portion.

A linearly-actuated lock including a housing, a lock case received within the housing along an axis, and a lock barrel rotatable relative to the lock case between a locked state and an unlocked state. The lock barrel includes tumblers and tumbler springs. The lock further includes a key insertable into the lock barrel to displace the tumblers relative to the lock barrel in a direction parallel to the axis and a sidebar extending through apertures of the lock barrel. The sidebar is engageable with a notch of the tumblers when the sidebar moves radially inward relative to the axis. The sidebar includes a cam surface slidable against at least one of the housing and the lock case when the lock barrel rotates. The sidebar also includes a projection having a single-ramped surface received within the notch of each tumbler when the lock barrel is in the unlocked state.

A method for mutually controlling and unlocking a dual plug in a lock includes: unlocking a code of a first plug first, the first plug restricting unlocking of a second plug, the second plug restricting rotating of the first plug before the code of the first plug is unlocked. after unlocking the code of the first plug, the first plug translating to a second position from a first position using a preset position difference, the first plug being unable to rotate during the translation; after moving the first plug to the second position, the first plug releasing a restriction on the second plug, the second plug still restricting the rotating of the first plug; and unlocking the code of the second plug, the first plug and the second plug being able to rotate synchronously so as to unlock the lock after unlocking the code of the second plug.

A lock cylinder having a barrel and a lock housing, the barrel having a locking cam pivotally mounted therein, the locking cam including at least one recess on an outer periphery thereof, a housing recess formed on an inner wall of the lock housing, a locking member that, in a locking position, is positioned at least partly in the housing recess formed on the inner wall of the lock housing, the at least one recess on the locking cam including a first recess on the locking cam, the first recess being sized to enable the locking member to move out of the housing groove, the barrel having a key slot for receiving a key, the key including a projection for causing the locking cam to rotate to bring the first recess on the locking cam adjacent to or into alignment with the locking member such that the locking member moves out of the housing recess and into the first recess of the locking cam and barrel slot to thereby enable rotation of the barrel in the lock housing.

A lock cylinder having a barrel and a lock housing, the barrel having a locking cam pivotally mounted therein, the locking cam including at least one recess on an outer periphery thereof, a housing recess formed on an inner wall of the lock housing, a locking member that, in a locking position, is positioned at least partly in the housing recess formed on the inner wall of the lock housing, the at least one recess on the locking cam including a first recess on the locking cam, the first recess being sized to enable the locking member to move out of the housing groove, the barrel having a key slot for receiving a key, the key including a projection for causing the locking cam to rotate to bring the first recess on the locking cam adjacent to or into alignment with the locking member such that the locking member moves out of the housing recess and into the first recess of the locking cam and barrel slot to thereby enable rotation of the barrel in the lock housing.

A square computer lock includes a square housing, and a lock core, a lock tongue, an unlocking button, a locking button and a latch arranged in the square housing. An insertion hole is formed on the rear side of the square housing. A row of plate tumblers are arranged in a lock core lock hole. A plate tumbler spring is arranged below each plate tumbler. Positioning posts are formed on a lateral surface of the latch. A wedge-shaped plate is formed at a lower end of the unlocking button. An unlocking spring is arranged between the wedge-shaped plate and the bottom of the square housing. The locking button is arranged in the square housing in a front-back movable manner. An upper end of the locking button penetrates in a locking hole in a front-back movable manner.