Patent ID: 7830600

Claim:
An electric roll-up limit detection device, comprising: a core tube; an electric motor in an electric motor housing; a core tube rotor inserted into one end of the core tube, the core tube rotor being fixed to a shaft of the electric motor for rotating the core tube, the core tube rotor defining an assembly cavity, the core tube rotor comprising: a spring-loaded rocker bar pivotally mounted to a rocker pin and a torsion spring in the assembly cavity so a tip of the rocker bar is biased to pivot and protrude outward through an opening in the core tube; and a positioning base mounted to the electric motor housing, the positioning base defining a control cavity and a pull bar cavity interlinked to the control cavity, the positioning base comprising: an upper limit switch in the control cavity; an actuator device for actuating the upper limit switch, the actuator device comprising an actuating piece that extends into the pull bar cavity; and a lower limit switch in the control cavity and below the tip of the rocker bar.