Patent ID: 8253289

Claim:
An overload protection device comprising: a transmitting shaft driven by a motor comprising a driving arm extending radially outwards from the transmitting shaft; a driving wheel rotatably engaged with the transmitting shaft at a distal end of the transmitting shaft apart from the motor; a rotatable arm rotatably connected to the driving wheel at the middle portion, and comprising two distal ends; and a resilient member connecting one of the distal ends of the rotatable arm with the driving wheel, the driving arm rotates follow the transmitting shaft to press against the other distal end of the rotatable arm apart from the resilient member, the rotatable arm applies a tensile force on the resilient member for driving the driving wheel to rotate; if the motor becomes overloaded, the resilient member stretches to a greater degree, the rotatable arm rotates and the driving arm separates from the rotatable arm, the transmitting shaft rotates freely, decreasing the load of the motor and protecting the motor form damaged due to overloading.