Abstract: A system for cleaning solar panels (photo-electric and/or water heating etc.) is driven by fluid driven motor (water and/or air driven motor) such as a piston motor or a vane motor. Some or all of the outlet water/air from the motor is used for cleaning the panels. The motor preferably also operates a cleaning mechanism, such as a rotating and or linear brush arrangement. The motor, gear system and/or components may be made from plastic. Optionally, a cleaning device travels along the edges of panels, optionally without requiring an additional rail structure. The cleaning device optionally includes a trailing water/air supply hose. In some embodiments, electrical components of the cleaning device are powered by an internal power supply. Control is optionally via an electrically actuated valve, a timer (for example a real time clock), a wireless receiver and/or a controller.

Abstract: A system for cleaning solar panels (photo-electric and/or water heating etc.) is driven by fluid driven motor (water and/or air driven motor) such as a piston motor or a vane motor. Some or all of the outlet water/air from the motor is used for cleaning the panels. The motor preferably also operates a cleaning mechanism, such as a rotating and or linear brush arrangement. The motor, gear system and/or components may be made from plastic. Optionally, a cleaning device travels along the edges of panels, optionally without requiring an additional rail structure. The cleaning device optionally includes a trailing water/air supply hose. In some embodiments, electrical components of the cleaning device are powered by an internal power supply. Control is optionally via an electrically actuated valve, a timer (for example a real time clock), a wireless receiver and/or a controller.

Abstract: The present invention provides a flexible hose easily converted to a rigid hose. The flexible-rigid bimodal hose comprises a plurality of adjacently engaged hollow members defining a tube having a first end, a second end, and an elongated hollow. A flexible tube as well as a cable pass through the hollow and extend therethrough. The cable acts as a means to apply tension on the hollow members. The hose has a flexible state in which each one of the hollow members is rotating in respect to neighboring hollow member and a rigid state in which the hollow members are forced together by the cable so that there is no relative movement between neighboring hollow members. An actuation means, which can be mechanically or hydraulically operated, is adapted to apply different tensile forces on the cable.

Abstract: The present invention provides a flexible hose easily converted to a rigid hose. The flexible-rigid bimodal hose comprises a plurality of adjacently engaged hollow members defining a tube having a first end, a second end, and an elongated hollow. A flexible tube as well as a cable pass through the hollow and extend therethrough. The cable acts as a means to apply tension on the hollow members. The hose has a flexible state in which each one of the hollow members is rotating in respect to neighboring hollow member and a rigid state in which the hollow members are forced together by the cable so that there is no relative movement between neighboring hollow members. An actuation means, which can be mechanically or hydraulically operated, is adapted to apply different tensile forces on the cable.