The present invention relates to a security locking system of the type comprising a cylinder (3) provided with a set of pistons (8) that are able to be positioned by elastic means on the impression formed in the edge (7b, 7c) of a control key (7) perpendicularly to the direction in which said key (7) is introduced into the cylinder (3), these pistons (8) being able to take up two positions, namely a position retracted into the cylinder (3) when the key (7) is introduced into the latter and an extended position when the key (7) is withdrawn there from. This system is characterized in that:—the cylinder is made up of a locking block (3) of parallelepipedal shape that is able to be received in a receiving block (5),—it comprises locking means which are activated when the locking block (3) is introduced into the receiving block (5).

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.

An improved locking device comprising a lock body, a locking plug, and a plurality of tumblers, wherein the tumblers are restricted from moving with respect to the locking plug during the time frame that the locking plug is rotated with respect to the lock body.

A key cylinder device includes a rotor resiliently mounting tumblers that are aligned by insertion of a mechanical key, a rotor case rotatably housing the rotor that is inserted in a direction opposite to an insertion direction of the mechanical key, and a cylindrical sleeve arranged around an outer peripheral surface of the rotor and fixed to an inner surface of the rotor case. The sleeve includes a hole that allows the tumblers to be disengaged when the mechanical key is inserted and to be engaged when the mechanical key is extracted.

The present invention discloses a trailer lock including a lock bar and a cylinder connected with the lock bar, wherein the cylinder includes an outer casing, a plug casing mounted at a front end of the outer casing and a plug provided in a middle of the plug casing, and further includes a bolt casing fixed in the outer casing and a cam accommodated in the bolt casing and connected with the plug, a telescopic core is provided in the cam, telescopic bolts for fixing the lock bar are provided at two sides of the bolt casing, the bolt has a front end connected with a rear end of the cam, and the lock bar has a front end provided with a press head having an annular neck where the bolt is clamped. The trailer lock designed in this way is convenient to use.

A padlock configured to be locked and unlocked by a key can an internal biasing element that establishes a position of the locking mechanism within an internal cavity of the lock body of the padlock. The locking mechanism can be a linear lock configured to receive the key along an axial direction from the key-receiving axial end of the locking mechanism and internal cavity. The locking mechanism can include at least a lock cylinder (and sometimes other components) and having an axial length that is less than an axial distance between a pair of axial ends of the internal cavity. Notably, the padlock includes a biasing element received in the internal cavity of the lock body that biases the lock cylinder along the axial direction to maintain a key stop distance from a key stop on the lock cylinder to the key-receiving axial end of internal cavity.

An improved locking device comprising a lock body, a locking plug, and a plurality of tumblers, wherein the tumblers are restricted from moving with respect to the locking plug during the time frame that the locking plug is rotated with respect to the lock body.

A drawer lock assembly is provided including a housing having a front face and a rear face; a barrel having a first end extending perpendicularly from the front face of the housing and a second end extending through the rear face of the housing; a locking actuation member disposed through the first end of the barrel; a driver disposed through the second end of the barrel to engage the locking actuation member; a bolt including a first member offset from a second member in a parallel relationship, the first member includes a slot configured to receive a cam of the driver; and an endplate configured to retain the driver and bolt in the housing, the endplate including a channel configured to receive the second member of the bolt, wherein upon actuation of the locking actuation member, the second member extends beyond the housing to engage a recess of a structure.

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 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.