Patent ID: 9351617
Filing Date: 2016-05-31
CPC Classification: A47L

Claim Text:
1. A device for performing an action on a surface to be treated, comprising: at least one movably arranged functional body facing said surface to be treated, at least one rotatable member configured to engage the surface to be treated, said rotatable member being rotatable about an axis generally parallel to the surface to be treated, driving means for driving the functional body, primary safety means in communication with the driving means and the movably arranged functional body, said primary safety means being configured to decouple the driving means from the functional body when a load exerted by the movably arranged functional body in the direction of the driving means under the influence of resistance forces experienced by the functional body exceeds a predetermined maximum value, secondary safety means movably arranged in the vicinity of the functional body, said secondary safety means being configured to exert a variable load on the primary safety means, said variable load being dependent upon a position of the secondary safety means relative to the primary safety means.