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 cylinder lock and key system. The plugs comprise a housing having a cylindrical bore; and a cylindrical plug which is rotatable and which exhibits a front end and a keyway. The keys comprise a key bow; and a key blade is rotatable about the rotational axis when inserted. The plugs and keys are provided with cooperating stop surfaces for defining the fully inserted position of the keys. At least one first stop surface is in contact with a corresponding second stop surface when a key is inserted in the keyway of a lock. At least two first stop surfaces of each key are arranged adjacent each other and at least two second stop surfaces of each lock are arranged adjacent each other, at or in proximity to the keyway. A cylinder lock and key combination, a key, a key blank and a cylinder lock are also disclosed.

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 pin tumbler cylinder lock that is virtually pick proof comprises a cylinder housing having a single bore and a cylinder key plug arranged in the single bore. The pin tumbler cylinder lock also comprises a cavity having a predetermined shape in a predetermined portion of the housing. The pin tumbler cylinder lock also includes a lockout sleeve arranged over the cylinder key plug wherein the lockout sleeve may rotate within the cavity to create a lockout mode for the pin tumbler cylinder lock when a lock picking attempt is occurring thereon.

A pin tumbler cylinder lock that is virtually pick proof comprises a cylinder housing having a single bore and a cylinder key plug arranged in the single bore. The pin tumbler cylinder lock also comprises a cutout having a predetermined shape in a predetermined portion of the housing. The pin tumbler cylinder lock also includes a lockout sleeve arranged over the cylinder key plug wherein the lockout sleeve may rotate within the cutout to create a lockout mode for the pin tumbler cylinder lock when a lock picking attempt is occurring thereon.

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 cylinder lock and key system. The plugs comprise a housing having a cylindrical bore; and a cylindrical plug which is rotatable and which exhibits a front end and a keyway. The keys comprise a key bow; and a key blade is rotatable about the rotational axis when inserted. The plugs and keys are provided with cooperating stop surfaces for defining the fully inserted position of the keys. At least one first stop surface is in contact with a corresponding second stop surfaces when a key is inserted in the keyway of a lock. At least two first stop surfaces of each key are arranged adjacent each other and at least two second stop surfaces of each lock are arranged adjacent each other, at or in proximity to the keyway. The invention also relates to a cylinder lock and key combination, a key, a key blank and a cylinder lock.

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 lock cylinder including a plug, a plurality of key followers, a sensor assembly structured to sense positions of the key followers, and a controller in communication with the sensor assembly. The plug includes a keyway and a plurality of plug tumbler shafts. Each of the key followers is movably seated in a corresponding one of the plug tumbler shafts and includes a sensor interface. The sensor assembly includes a plurality of sensors, each of which includes at least one sensing region. Each of the key followers is associated with one of the sensors via an associative link formed between the sensor interface and the corresponding sensing region. The sensors are structured to generate an output signal indicative of the transverse position of the associated key follower, and the controller is structured to select and perform actions based upon the output signals.

A cylinder lock and an associated key, the lock including a fixed body and a plug which is accommodated within a respective cavity of the body and can rotate with respect to the body. The plug includes a substantially longitudinal compartment for the functional accommodation of a key which includes a grip portion from which an elongated body extends and which is provided with coding grooves and protrusions on its outer surface. Between the plug and the body are respective accommodation channels for translating coding elements, which open onto the substantially longitudinal compartment. The plug includes at least one auxiliary duct which faces the substantially longitudinal compartment and extends at least partially in the body for the sliding accommodation of at least one coding unit that includes at least one pin and at least one conical portion.