Patent attributes
An electric roll-up limit device includes a tube coupled by a tube rotor to an electric motor. The tube rotor contains a rocker bar that extends from the tube and activates a lower limit switch when a sheet of material is fully unrolled from the tube. A base below the tube rotor contains a pull bar cavity and an actuator device with a rotatable support frame and a rotatable actuator lever. The support frame supports the actuator lever and prevents it from rotating in one direction to activate an upper limit switch. A spring couples the rotation of the support frame and the actuator lever. When the sheet is fully rolled onto the tube, the pull bar cap retracts into the pull bar cavity and butts against the support frame. This causes the support frame to release the actuator lever, which then rotates to activate the upper limit switch.
