US Patent 7725977 Remotely actuated surface preparation device

A remote surface preparation device for preparing a remote surface, such as cleaning the inside surface of an aquarium tank from the outside is provided. The device includes a remotely actuated surface preparation assembly having a body with at least one magnetic element for coupling it for remote actuation to complimentary magnetic elements in a moving drive head disposed at some distance therefrom. The device includes an adjustment mechanism which can vary the magnitude of the magnetic forces coupling the remote surface preparation assembly to the device, even during device operation.