Abstract: The lifting device comprises abiased slide shoe adapted to be slidable with respect to a member of an openable structure, a lifting arm having two ends, one end adapted to be pivotally connected with a member of the structure and the other end associated with said slide shoe, and a braking device comprising at least one brake shoe slidable on a respective brake face of said lifting device, said braking device modulating the force resulting from the bias on said biased slide shoe. An adjusting device is adapted to adjust said progressive modulation of said force resulting from the bias on said biased slide shoe, and comprises a manipulation member, which when manipulated by a user activates said adjusting device to adjust a brake force of said brake shoe exerted on said brake face in a given position of said brake shoe.

Abstract: The lifting device comprises a biased slide shoe adapted to be slidable with respect to a member of an openable structure, a lifting arm having two ends, one end adapted to be pivotally connected with a member of the structure and the other end associated with said slide shoe, and a braking device comprising at least one brake shoe slidable on a respective brake face of said lifting device, said braking device modulating the force resulting from the bias on said biased slide shoe. An adjusting device is adapted to adjust said progressive modulation of said force resulting from the bias on said biased slide shoe, and comprises a manipulation member, which when manipulated by a user activates said adjusting device to adjust a brake force of said brake shoe exerted on said brake face in a given position of said brake shoe.

Abstract: A window operator with means for electric operation of windows and comprising a magazine (8, 9) for an opening member (80), a drive member (10) for the opening member (80), an electric motor (5) and a worm gear (15, 40) coupled with the shaft (41) of the motor. A preferably static self-locking reduction gear is inserted between the worm gear (40, 15) and the drive member (10). The worm (40) and the worm wheel (15) of the worm gear are furthermore supported so that their respective axes of rotation (41, 63) are mutually movable.

Abstract: A window operator with means for electric operation of windows and comprising a magazine (8, 9) for an opening member (80), a drive member (10) for the opening member (80), an electric motor (5) and a worm gear (15, 40 ) coupled with the shaft (41) of the motor. A preferably static self-locking reduction gear is inserted between the worm gear (40, 15) and the drive member (10). The worm (40) and the worm wheel (15) of the worm gear are furthermore supported so that their respective axes of rotation (41, 63) are mutually movable.