Patent ID: 7000353

Claim:
An electrical actuator for a swing gate, the actuator comprising, a non-reversible electrical gear motor inside one of a casing and a protection housing, said motor actuating via a transmission joint rotation of a non-reversible worm screw that engages a nut screw, and where the nut screw has an axially translating cylindrical shaped member connected thereto, a drive pin is located on a distal end of said cylindrical shaped member, said drive pin is adapted to be fixed to the swing gate, said transmission joint including a coupling with teeth and inserted between the worm screw and an output shaft of the gear motor; a release element is radially disposed with respect to said coupling for a manual disengagement of the coupling in case of emergency; said coupling comprising a drive element keyed onto and sliding on the output shaft of the gear motor and a driven element fixed to a proximal end of the worm screw, said drive element and said driven element both have said teeth for engagement when said drive element and said driven element are close together in an engaged condition, and said teeth are for disengagement when said drive element and said driven element are moved apart from each other; a thrust spring is associated to the drive element to keep said drive element and said driven element of the coupling in the engaged condition, and in which the release element is coupled to said drive element to move said drive element away from the driven element to disengage the coupling; the release element includes an eccentric pin associated with an annular groove on the periphery of the drive element, said eccentric pin being rotatable from a engagement position to a release position through rotation of a lock barrel by a respective key.