A clutch for a door lock may comprise an output shaft configured to operate the door lock, and a thumb turn shaft coupled to the output shaft comprising an inclined projection. The clutch may also comprise an input gear configured to be coupled to an actuator output, and a coupler coupled to the input gear such that the coupler and input gear rotate together. The coupler may be configured to translate between an engaged position and a disengaged position, where the inclined projection of the thumb turn shaft is configured to move the coupler from the disengaged position to the engaged position when the thumb turn shaft rotates relative to the coupler. In the disengaged position the coupler may be decoupled from the output shaft.

An electronic cylinder that can be actuated by an electronic key, wherein said electronic cylinder includes a stator body, a rotor, a motor that can be actuated by the electronic key, a clutch mechanism configured to lock and unlock the rotation of the rotor with respect to the stator body by means of the actuation of the motor, and a system for detecting rotation of the rotor with respect to the stator body, said system being configured to deactivate the motor when the rotor rotates with respect to the stator body. To this end, the clutch mechanism includes two locking balls which are elements that move radially inside the cylinder, to lock and unlock the rotation of the rotor) with respect to the stator body, said rotation of the rotor being carried out by the electronic key.

A clutch for a door lock may comprise an output shaft configured to operate the door lock, and a thumb turn shaft coupled to the output shaft comprising an inclined projection. The clutch may also comprise an input gear configured to be coupled to an actuator output, and a coupler coupled to the input gear such that the coupler and input gear rotate together. The coupler may be configured to translate between an engaged position and a disengaged position, where the inclined projection of the thumb turn shaft is configured to move the coupler from the disengaged position to the engaged position when the thumb turn shaft rotates relative to the coupler. In the disengaged position the coupler may be decoupled from the output shaft.

Coupling arrangement for a lock device, the coupling arrangement comprising an input and an output element rotatable about a rotation axis; an engaging member movable between a first and second position; an electric motor arranged to affect movement of the engaging member between the first and second positions; a coupling member rotationally locked to the input element and axially movable relative to the input element between a decoupled position, where a rotation of the input element is not transmitted by the coupling member to a rotation of the output element, and a coupled position where a rotation of the input element is transmitted by the coupling member to a rotation of the output element; and a transmission mechanism arranged to transmit a rotation of the coupling member to a movement of the coupling member from the decoupled position to the coupled position when the engaging member adopts the second position.

The embodiments presented within provide methods, devices, and systems that improve access control through the use of smart cylinder locks. In one embodiment, a smart cylinder may perform a process including receiving a key, emitting an energy source of electromagnetic radiation; detecting a change in the energy source due to a physical property of the key, determining the physical property of the key from the change in the energy source, comparing the physical property with a predetermined value, and engaging a mechanism operatively coupled to a locking device that allows the locking device to lock or unlock when the physical property matches the predetermined value.