Abstract: Embodiments of the resent invention provide an electric motor driven door or barrier opener with a manually operable drive for use in the event of a power failure. The operator includes a manually rotatable drive wheel and manual rotation of the drive wheel effects a movement of at least one drive coupler in generally radially extending direction relative to the drive shaft to effect a drive coupling between the drive wheel and the drive shaft to input drive to permit manual opening and or closing of the door.

Abstract: Embodiments of electric motor driven door or barrier opener with a manually operable drive for use in the event of a power failure are provided. The operator comprises a gear box drive connectable with an electric motor of said operator, said gear box comprising an output for drive coupling with said door to effect opening and closing of said door by said motor and a shaft that drive rotates when said motor rotates. The shaft carries a free wheeling manually rotatable drive wheel as said manually operable drive and useable in the event of power failure to effect manual drive rotation movement of said shaft to open and close the door via said gearbox.