Door cylinder lock

A cylinder lock for use in a door lock mounted in a door having an outer and an inner side, said cylinder lock comprising an outer plug, a rotary cam adapted to move a deadbolt in said door lock, and a clutch adapted to engage for rotation said outer plug to said rotary cam, said cylinder lock further comprising an electronic blocking device (EBD) and a drive means adapted to actuate said clutch upon an unblocking command from said EBD generated upon receiving therein an unblocking signal emitted from the outer side of the door, thereby enabling moving said deadbolt by rotation of said outer plug, wherein

• said cylinder lock comprises an inner handle attached thereto at said inner side of the door, said EBD and said drive means being entirely accommodated within said inner handle;
• wherein said inner handle is detachably secured to said cylinder lock solely by one or more mechanical fasteners accessible from the inner side of the door alone a surface free of electric contacts and free of any connections preventing separation of said inner handle from the remaining parts of the cylinder lock after said one or more fasteners is released, whereby said inner handle is detachable from said cylinder lock without a need to dismantle any part of the door or any other part of the lock.