Abstract: A spiral drive system for threaded fasteners includes driver-engageable surfaces on the head end of the fastener in which at least some of the driver-engageable surfaces are defined by a spiral segment configured to maximize torque transmission while spreading the driving load over a broad driver-fastener interface to reduce the risk of development of high stress regions. Drivers and related tooling also are disclosed.

Abstract: A spiral drive system for threaded fasteners includes driver-engageable surfaces on the head end of the fastener in which at least some of the driver-engageable surfaces are defined by a spiral segment configured to maximize torque transmission while spreading the driving load over a broad driver-fastener interface to reduce the risk of development of high stress regions. Drivers and related tooling also are disclosed.

Abstract: A spiral drive system for threaded fasteners includes driver-engageable surfaces on the head end of the fastener in which at least some of the driver-engageable surfaces are defined by a spiral segment configured to maximize torque transmission while spreading the driving load over a broad driver-fastener interface to reduce the risk of development of high stress regions. Drivers and related tooling also are disclosed.

Abstract: The present invention is directed to a magnetic pump for pumping ferrofluids. The magnetic pump in its simplest form has at least two coils which are electrically connected to a multi-phase power source to produce a traveling electromagnetic field. In close proximity to the coils and substantially normal to the axis of the coils is a tube which defines the path of fluid flow. It is preferred that the coils be embedded in a stator of ferromagnetic material and that the stator be cylindrical. Preferably the tube is wound about the cylindrical stator either internal to or external to the stator. In a preferred embodiment of the present invention the tube is placed in an annular gap between cylindrical stators of different diameter and having coils energized so as to produce reinforcing traveling magentic fields.

Abstract: The present invention relates to a cyclic method and single pipe system for collecting and transferring heat energy from a periodic heat source to a thermal storage reservoir and preventing the back flow of such heat energy. The system is responsive to the temperature of the thermal storage reservoir and the availability of the heat source without reliance upon other external energy inputs or controls such as valves, pumps, floats, sensors, or electronic circuitry. During the heat collection stroke of the cycle an evaporator containing a volatile liquid generates a flow of vapor to a remote heat exchanger where the vapor gives up its latent heat of vaporization to the thermal storage reservoir thereby condensing. Condensate flows from the heat exchanger to an insulated pressure sustaining sump that efficiently accepts pulsatile fluid delivery.