Abstract: A parasitic cleaning system for cleaning the reflective surfaces of a heliostat is disclosed. The system includes a blade carriage assembly that cleans the surface by imparting a frictional force as the carriage assembly moves across the surface to be cleaned. A cleaner drive system controls the motion of the blade carriage assembly over the surface. A guide system connects the cleaner drive system to the blade carriage assembly. The cleaner drive system applies a spring force to move the blade carriage assembly upwardly. The same spring system controls the lowering of the blade assembly over the surface to be cleaned.

Abstract: A mechanical device for cleaning a reflective glass surface is described. In one example, the glass surface is a heliostat mirror. The device includes a cleaning head and a blade assembly. In one example, the cleaning head includes an elongated base member and having a cleaning pad. The cleaning blade assembly includes a cleaning blade. The blade is mounted to the base member and is moveable between a first engaged position that causes the blade of the blade assembly to come into contact with the reflective glass surface and a second disengaged position that causes the blade of the blade assembly to come out of contact with the glass surface. A method of cleaning a glass surface is also disclosed.

Abstract: An apparatus for securing a delivered package to an immoveable stationary structure is disclosed. The apparatus comprises a controlled access container, an anchoring device and a tethering structure for securing the container to the anchoring device. A method of securing a package being delivered to an intended delivery location is disclosed. The method comprises providing an anchor that is capable of securing a tethering device to a stationary structure, providing a controlled access container, and providing a tether that secures the anchor to the controlled access container. A lock is provided on the controlled access container. A removeable anchoring mechanism is disclosed having three portions, each portion positioned such that the anchoring mechanism wraps around an edge of a door and fits securely within the door jam. An expanded portion prevents the mechanism from being pulled through the door and a locking mechanism secures a tether to the stationary door.