Patent ID: 9689170
Date: 2017-06-27
CPC Classifications: E04G

Claim:
1. A method for cleaning an upright extending surface characterized by: providing a frame, locating a cylindrical cleaning element on the frame for rotation about a horizontal axis located in a horizontal plane for cleaning an upright extending surface, rotating the cleaning element about the horizontal axis of the cleaning element with a first motor disposed on the frame, pendently supporting the frame and cylindrical cleaning element adjacent the upright extending surface with a cable mounted to a davit on a support above the upright extending surface, moving the frame and cleaning element with a winch operatively connected to the cable, said winch being driven by a second motor relative to the upright extending surface to clean the surface with the cylindrical cleaning element, establishing with a force system with a fan having an axis of rotation perpendicular to the horizontal axis of the cylindrical cleaning element, mounting the fan on the frame, whereby the fan is operable to provide a continuous force on the frame and cylindrical cleaning element towards the upright extending surface to continuously maintain the cylindrical cleaning element in surface cleaning engagement with said upright extending surface during cleaning thereof, and locating the fan on the frame with the axis of rotation of the fan located in the same horizontal plane as the axis of rotation of the cylindrical cleaning element whereby the location of the fan on the frame does not alter the location of the cylindrical cleaning element relative to the upright extending surface during cleaning of said upright extending surface with the cylindrical cleaning element.