Abstract: The present invention discloses a permeable mattress, or permeable pillow, which includes a base (1). Cushioning support (3) are attached to the top of the base in a distributed manner, to support a mesh (4) which supports a person, or person's head. Adjacent to the mesh there may be one or more layers of each, or any, of the following; permeable fabric, permeable foam, permeable fibres or perforated rubber. The mattress may be covered in a layer of permeable fabric (6). Any of the layers may be removably attached to the mattress assembly. In a further embodiment of the invention, beneath the base of the mattress, or integral with the base, there may be provided a spill tray that has a contoured structure, to guide fluids such that they flow under gravity into a collecting bowl.

Abstract: The present invention discloses a permeable mattress, or permeable pillow, which includes a base (1). Cushioning support (3) are attached to the top of the base in a distributed manner, to support a mesh (4) which supports a person, or person's head. Adjacent to the mesh there may be one or more layers of each, or any, of the following; permeable fabric, permeable foam, permeable fibres or perforated rubber. The mattress may be covered in a layer of permeable fabric (6). Any of the layers may be removably attached to the mattress assembly. In a further embodiment of the invention, beneath the base of the mattress, or integral with the base, there may be provided a spill tray that has a contoured structure, to guide fluids such that they flow under gravity into a collecting bowl.

Abstract: A control system for an internal combustion engine having a plurality of cylinders and an engine control module is disclosed. Each cylinder has at least one intake valve and one exhaust valve. Each valve is actuated by an electromagnetic valve actuator. The servo control system includes a control module and a power module. The control module includes an electronic control unit coupled to the engine control module for receiving engine sensor information, a servo board coupled to the electronic control unit for receiving a command signal and sending delay feedback signals to the electronic control unit, and a demodulation board coupled to the servo board for sending a voltage signal proportional to the valve position to the servo board. The power module is coupled to the electromagnetic valve actuator and the control module and provides current output to the electromagnetic valve actuator and sends a current monitor signal proportional to the current output back to the control module of the control system.

Abstract: The rotor housing of a rotary piston internal combustion engine has inner, intermediate and outer walls. The inner and intermediate walls are joined by radial webs and define coolant channels and the intermediate and outer walls are joined by non-radial webs between which through bolts extend to join the rotor housing end plates to the housing. The arrangement better absorbs the stresses set up in the housing during engine operation and leads to simpler through bolt installation.

Abstract: The rotor housing of a rotary piston internal combustion engine comprises inner and outer walls between which coolant channels are defined. The channels are separated by webs and at least some of these webs, normally in the combustion areas, extend at an angle of 281/2.degree. to the radial direction to achieve a stress distribution which minimizes the risk of web root failure.