A disclosed device may have a clamping mechanism operably coupled to a rotatable positioning mechanism, the clamping mechanism being intended to retain a position of at least one key. The device is shaped such that additional torque can be applied to the key when rotating the key when inserted in a lock. In some embodiments, a light source may be included with the device.

A key assembly includes a shank and a handle portion. The handle portion includes a free end and connection end from which the shank extends. The shank includes multiple grooves. A tubular portion is connected to connection end of the handle portion and a portion of the shank is accommodated in the tubular portion. The length from the distal end of the tubular portion to the distal end of the shank is the same as the depth from the key hole to the inner bottom of the lock cylinder. When the shank of the key assembly is inserted into the lock cylinder and reaches the inner bottom of the lock cylinder, the distal end of the tubular portion contacts the lock.

A key assembly includes a shank and a handle portion. The handle portion includes a free end and connection end from which the shank extends. The shank includes multiple grooves. A tubular portion is connected to connection end of the handle portion and a portion of the shank is accommodated in the tubular portion. The length from the distal end of the tubular portion to the distal end of the shank is the same as the depth from the key hole to the inner bottom of the lock cylinder. When the shank of the key assembly is inserted into the lock cylinder and reaches the inner bottom of the lock cylinder, the distal end of the tubular portion contacts the lock.

A cover for a key is disclosed. The cover includes: a first wall; a second wall opposite to the first wall; and an outer wall extending between the first wall and the second wall, the outer wall defining a pair of slots extending therethrough, the slots being positioned opposite to each other on the outer wall, wherein the first wall, the second wall, and the outer wall define a closed chamber for receiving a bow of the key and an opening to the chamber.

A cover for a key is disclosed. The cover includes: a first wall; a second wall opposite to the first wall; and an outer wall extending between the first wall and the second wall, the outer wall defining a pair of slots extending therethrough, the slots being positioned opposite to each other on the outer wall, wherein the first wall, the second wall, and the outer wall define a closed chamber for receiving a bow of the key and an opening to the chamber.

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 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 key comprises a body with a head and a blade and a magnet in the head. The key can be part of a key set including a plurality of keys. Each key can have a hole through the head, for example through approximately a center of the head. The key set can include a hub through the holes in the keys, such that the keys are coupled by and are rotatable around the hub. The magnets in the keys can silence, and resist, index, and lock rotation of the keys around the hub.

A key comprises a body with a head and a blade and a magnet in the head. The key can be part of a key set including a plurality of keys. Each key can have a hole through the head, for example through approximately a center of the head. The key set can include a hub through the holes in the keys, such that the keys are coupled by and are rotatable around the hub. The magnets in the keys can silence, and resist, index, and lock rotation of the keys around the hub.

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.