Giunto scorrevole ad accoppiamento di forma e apparecchio domestico o di pulitura con un giunto scorrevole con accoppiamento di forma

The present invention relates to an overload protection coupling (slip coupling), which comprises a driving portion, a driven portion and a plurality of spring arms. Each of the spring arms is either fixedly connected to the driven portion and approached to the driving portion with its free end, or fixedly connected to the driving portion and approached to the driven portion with its free end, wherein the free end of each spring arm has a form-fitting section and wherein the driving portion or the driven portion has multiple spring arm-transmission sides. In order to ensure that such an overload protection coupling provides a precise starting torque and a high frictional torque and can be produced inexpensively, the present invention provides more spring arm-transmission sides than the spring arms, and enables at least two spring arms to be attached onto the spring arm-transmission sides in asynchronous and form-fitted manner, such that, when one spring arm is slipped due to overload from one spring arm-transmission side of its form-fitting section, another spring arm is slipped frictionally through the connection surface of the slip coupling with an arm section away from its own form-fitting section, wherein the connection surface is disposed in front of another spring arm-transmission side in the rotation direction of the slip coupling. Furthermore, the present invention further relates to a tool driven by a motor and the home appliance or cleaning device based on the slip coupling of the present invention.