The locking device includes a key having a cylindrical shaft in which a guide groove is formed in the axial direction, and a cylinder lock which includes an outer cylinder, an inner cylinder, a locking bar and a tumbler, the inner cylinder has an inner cylinder main body rotatably accommodated in the outer cylinder, a rod fixed to the inner cylinder main body, and a key insertion slot, the locking bar is interposed between the inner cylinder main body and the outer cylinder and prevents the rotation of the inner cylinder by engaging and disengagingly locking the inner cylinder main body and the outer cylinder, and the tumbler has a guide convex portion engageably and detachably engaged with the key groove, and an inner concave portion rotatably received in the inner cylinder and dropping the locking bar.

The locking device includes a key having a cylindrical shaft in which a guide groove is formed in the axial direction, and a cylinder lock which includes an outer cylinder, an inner cylinder, a locking bar and a tumbler, the inner cylinder has an inner cylinder main body rotatably accommodated in the outer cylinder, a rod fixed to the inner cylinder main body, and a key insertion slot, the locking bar is interposed between the inner cylinder main body and the outer cylinder and prevents the rotation of the inner cylinder by engaging and disengagingly locking the inner cylinder main body and the outer cylinder, and the tumbler has a guide convex portion engageably and detachably engaged with the key groove, and an inner concave portion rotatably received in the inner cylinder and dropping the locking bar.

A weather resistant tumbler lock has an elongated body, and defines a longitudinal axis. The lock is interchangeable with another lock having a corresponding asymmetrical perimeter profile with an opening in a top surface sealed with a cap, the other lock having a different rotatable core and a different configuration of tumblers. A drainway provides a channel for water to flow outwardly from the interior of a shell housing, a rotatable core and a keyway within the core, to a drain below the lock. The drain connects to a channel through a lower edge. The core provides an arcuate gap in a lower quadrant adjacent the interior surface of the shell for fluid communication with the drainway. A method includes identifying a substitute tumbler lock with an impermeable outer wall for replacing another lock having an identical outer perimeter profile and a permeable closed opening on its top surface.

A weather resistant tumbler lock has an elongated body, and defines a longitudinal axis. The lock is interchangeable with another lock having a corresponding asymmetrical perimeter profile with an opening in a top surface sealed with a cap, the other lock having a different rotatable core and a different configuration of tumblers. A drainway provides a channel for water to flow outwardly from the interior of a shell housing, a rotatable core and a keyway within the core, to a drain below the lock. The drain connects to a channel through a lower edge. The core provides an arcuate gap in a lower quadrant adjacent the interior surface of the shell for fluid communication with the drainway. A method includes identifying a substitute tumbler lock with an impermeable outer wall for replacing another lock having an identical outer perimeter profile and a permeable closed opening on its top surface.

A trapped key interlock system is disclosed. A pair of hollow tubular casings located one inside the other and each having a series of elongate slots are used. When the lock is in a locked condition the elongate slots are aligned as inner and outer pairs with engaging members extending through the pairs of slots is preventing rotational movement of the tubular casings relative to each other. The engaging members are biased towards this locked condition. On insertion of the correctly coded key the engaging members are caused to move against the biasing force out of engagement with the slots in the outer tubular casing thereby allowing the inner tubular casing to rotate relative to the outer tubular casing and moving the lock to an unlocked condition.

A rekeyable lock cylinder with a cylinder body and a plug assembly. The lock cylinder includes a plurality of key followers and a corresponding plurality of racks disposed in the plug assembly. The lock cylinder includes, for example, a locking bar for blocking rotation of the plug assembly with respect to the cylinder body to prevent unlocking of the rekeyable lock cylinder with an unauthorized object. In some embodiments, the locking bar is configured such that torqueing the plug assembly with an unauthorized object applies force to the locking bar without translating such force to the plurality of racks. This type of arrangement enhances torque resistance of the lock cylinder against attempted forced entry.

A key blank for manufacturing a key for a disk cylinder having rotatable disk tumblers has a key shaft that extends along a longitudinal axis. The key shaft further has a plurality of notches that extend transversely to the longitudinal axis, that extend at equal spacings from one another, and that have the same depth. In a key, these notches may form chamfers of drive slopes for driving the disk tumblers.

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 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 lock cylinder, for a cylinder lock, having a cylinder housing with a core receiving cut-out and axially extending blocking grooves open to the core receiving cut-out. The lock cylinder having a cylinder core supported inside the core receiving cut-out and having a plurality of guide slots extending through the core. Plate tumblers supported in the guide slots such that they can be displaced back and forth in the plate sliding direction between a locking position, in which the cylinder core is connected to the cylinder housing in a non-rotating manner about a cylinder axis, and a non-locking position, in which they are driven into the cylinder core and the cylinder core can rotate about the cylinder axis. Wherein two plate tumblers are connected to a single spring so as to be driven in opposite directions into their respective locking positions.