Patent ID: 6845642

Claim:
A clutch mechanism for electronic locks for minimising transmitted stresses, preventing premature wear, being able to be adapted to any lock, and minimising idle turning of a door aperture element selected from a handle and a outer knob, having an outer escutcheon which holds a key reader and an outer knob for actuation; an inner escutcheon which holds an inner knob for actuation; wherein the clutch mechanism is housed in the inner escutcheon; the inner escutcheon comprises an electronic control circuit powered by batteries, and a clutch mechanism; a first shaft and the second shaft project from the clutch mechanism, the first shaft and the second shaft are concentric, the first shaft acts on a tumbler of the lock, the second shaft freely rotates inside the first shaft and is partially inserted inside the outer knob rotating integrally with it; the key reader is electrically connected to the control circuit so that when a valid key is presented, the control circuit supplies power to an electrical device, causing the clutch to engage, by making the concentric shafts temporarily integral and permitting the outer knob to open the lock.