ELECTRIC ACTUATOR FOR DRIVING SCREEN USED IN HOME ENVIRONMENT Russian patent published in 2014 - IPC E05F15/10 

FIELD: electricity.

SUBSTANCE: invention relates to an electric actuator for driving a screen. The electric actuator (100) for driving a screen (2) used in a home environment, which moves between its open position and closed position, said actuator being provided with a spring brake (105), said brake having a helical spring (130; 230), each end of which forms a tab (132a, 132b; 232a, 232b) extending radially or axially relative to the central axis (X₁₃₀; X₂₃₀) of the spring; a friction part (140; 240) having a substantially cylindrical friction surface (141; 241) against which at least one turn of the helical spring bears radially; an inlet part (110; 210) driven by the electric motor (103) of the actuator, and configured to come into contact with at least one tab (132a, 132b; 232a, 232b) of the spring, in such a manner as to drive the spring in rotation about the central axis (X₁₀₅) of the brake, in a direction making it possible to reduce the contact force between the helical spring and the friction surface; and an outlet part (120; 220) connected to the screen (2) and configured to come into contact with at least one tab (132a, 132b; 232a, 232b) of the spring in such a manner as to drive the spring in rotation about the central axis (X₁₀₅) of the brake, in a direction making it possible to increase the contact force between the helical spring and the friction surface; wherein, while the screen is being lowered, the inlet part (110; 210) drives the spring (130; 230) in rotation with the contact force being decreased to the extent that the outlet part (120; 220) is released in rotation, without direct contact between the inlet part and the outlet part; wherein the inlet part (110; 210) has at least two contact surfaces (113a, 113d; 213b, 217c) adapted to transmit a drive torque (C_M) for raising the screen (2), by direct contact with at least two corresponding contact surfaces (123a, 123c; 223b, 227a) of the outlet part (120; 220).

EFFECT: design of an electric drive equipped with a spring brake, which improves operation of previous brakes.

10 cl, 11 dwg