Abstract: A fluid heat exchanger having an interior cavity of a housing. A tank positioned within the interior cavity has a first wall surrounding an axial passage and a second wall surrounded by a circumferential passage. Heat is transferred to both the first wall and surrounding second wall thereby heating fluid in the tank from opposing sides. The heat transfer is enhanced with a cyclonic flow of heated fluid in the circumferential passage and axial passage.

Abstract: A rotary cam radial engine formed of two primary components engaged at a mid section to allow for an easy repair to the vehicle. The device features a body having radially oriented apertures; and a plurality of pistons in a respective reciprocating engagement, within each respective said cylinder. The pistons are driven by low pressure fluids and/or a vacuum and the engine being formed of two main components can be taken apart without tools for maintenance and reconfiguration.

Abstract: A rotary cam radial engine formed of two primary components is provided which is engaged at a mid section to allow for an easy repair. The device features a body having radially oriented locating cavities engaged with cylinders and a plurality of pistons in a respective reciprocating engagement, within each respective cylinder. The pistons are driven by low pressure fluids and/or a vacuum and the engine being formed of two main components can be taken apart without tools for maintenance and reconfiguration.

Abstract: A rotary cam radial engine formed of two primary components engaged at a mid section to allow for an easy repair to the vehicle. The device features a body having radially oriented apertures; and a plurality of pistons in a respective reciprocating engagement, within each respective said cylinder. The pistons are driven by low pressure fluids and/or a vacuum and the engine being formed of two main components can be taken apart without tools for maintenance and reconfiguration.

Abstract: The present invention is directed to a Rotary Cam Radial Steam Engine of a single or multiple pistons and cylinders, which are driven lineally by the introduction of pressure from an external source, through a single, centralized rotating valve. The valve has been designed to provide timed introduction of the pressurized gasses into each cylinder at the moment determined to be best for the engine's applied use, and then the same central rotating valve assembly at the appropriate moment opens to allow the used pressure to exhaust it into the atmosphere, or a collection system. The lineal direction of the pistons is then directed outward and onto an external rotating cam which converts the lineal energy into circular rotating energy. The engine can be disassembled for servicing or complete rebuilding and reassembled quickly with use of no tools.

Abstract: An assembly for mounting an abrasive sheet on a rotary abrading tool having a circular mounting member fastenable to the tool drive shaft and having an opposite surface bearing a typically square raised backup pad to which a square sheet of abrasive material can be fastened. Other straight edged backup pad configurations can be used if desired. Entrance holes are formed through the mounting member adjacent to the backup pad. A circular shroud is provided on the mounting member surface opposite the backup pad covering the exit holes. Air and dust are evacuated from said shroud and holes with a vacuum or built-in impeller evacuation system. The shroud has a diameter less than that of the mounting member and may have an edge engaging a circular groove in the mounting member to minimize air leakage between shroud and mounting member. The back up pad may be a reversible, double sided pad snapped into a mounting member recess. Additional dust evacuation holes and grooves may be formed in the backup pad itself.

Abstract: A system for removing dust generated by rotary hand tools such as grinders and sanders. A shroud is installed over the grinding or sanding head in communication with a vacuum exhaust system to draw away dust, chips and the like. The shroud includes a generally circular base having a peripheral skirt on one side to surround the grinding or sanding disc and a collar arrangement on the other for attachment to a cylindrical tool housing. The collar may be an axial partial tube section that is clamped to the housing. Collar flexibility allows use with housings over a range of housing diameters. Alternatively, the collar may be one or more brackets slidably mounted on the base. The brackets are adjusted to contact the housing and are clamped to the housing and, if necessary, are fastened to the base. Removable and adjustable exhaust tubes are provided to accommodate different desired vacuum hose directions and different vacuum hose diameters.