Alternate manual or power auxiliary control device for controlling winding doors or the like

Claim 1

An auxiliary control device for winding doors or grilles, sectional doors, or the like, which comprises a rotary control member adapted to be actuated manually and rotatably for producing the axial translation of a sliding member coaxial to the control member against the force of a resilient means through the medium of a frontal cam device disposed transversely between said control member and said sliding member, said sliding member supporting a first half-coupling adapted, beyond a predetermined sliding movement, to engage a corresponding second half-coupling supported by a main drive shaft controlling the winding door or grille, sectional door or the like, a device being provided for producing an antagonistic torque counteracting the rotation of said sliding member, wherein said device capable of producing an antagonistic torque consists of a rotary braking member disposed coaxially to said sliding member and responsive to a friction element, said rotary braking member comprising at least one guiding projection extending towards said second half-coupling and adapted to be contacted and slidably engaged by a corresponding nose, extending in the direction opposed to the direction of said guiding projection, provided on said sliding member, so as to cause said sliding member to slide towards said second half-coupling, the heights of said guiding projection and nose respectively being such that the axial movement of said sliding member is shorter than the axial movement resulting from the action of said cam device.