Abstract: A power tool that includes a motor sub-assembly, one or more batteries, and a cooling fan. The motor sub-assembly includes a motor and a motor fan. The one or more batteries are configured to provide power to the motor. The cooling fan is disposed vertically above the motor sub-assembly and the one or more batteries during operation of the power tool, where the cooling fan is configured to draw air in an upwards direction through the cooling fan, thereby dissipating heat from the motor and/or the one or more batteries, and where the upwards direction is the same a free convection direction associated with a density difference between hot air radiating from the motor and/or one or more batteries and surrounding cooler air.

Abstract: A power tool that includes a motor sub-assembly, one or more batteries, and a cooling fan. The motor sub-assembly includes a motor and a motor fan. The one or more batteries are configured to provide power to the motor. The cooling fan is disposed vertically above the motor sub-assembly and the one or more batteries during operation of the power tool, where the cooling fan is configured to draw air in an upwards direction through the cooling fan, thereby dissipating heat from the motor and/or the one or more batteries, and where the upwards direction is the same a free convection direction associated with a density difference between hot air radiating from the motor and/or one or more batteries and surrounding cooler air.

Abstract: A magnetic drive comprises a plurality of identically shaped and sized permanent magnets for transmitting torque to a shaft through a nonmagnetic cylindrical barrier wherein the magnets have inner and outer cylindrical surfaces with the outer cylindrical surfaces having a radius substantially the same as the inner cylindrical surfaces.

Abstract: A sealess sump pump comprises an impeller chamber mounted at the bottom of a pump column, an impeller journaled in the impeller chamber, a rare earth driven magnet assembly fixed to rotate with the impeller, a rare earth driving magnet assembly mounted at the lower end of an elongate pump shaft and a nonmagnetic barrier between the driving and the driven magnet assemblies.

Abstract: A method for distillation of a multiple-component liquid/solid system, for example, used engine coolant at two different vaporizing pressures. One component, for example, water, is separated into one distillate stream at a first pressure and the other component, for example, ethylene glycol, is separated into another distillate stream at a second pressure. Each distillate stream is directed toward an individual storage tank.