Abstract: A system for controlling the flow of liquid between a reservoir and a liquid source. Passageways are provided between the reservoir and the source for the flow of liquid therebetween. Selectively operable valves, including automatic check valves, are disclosed in various forms of the invention for actuation between a first position for filling the reservoir with liquid from the source and a second position for emptying liquid from the reservoir to the source. The automatic valves prevent the flow of liquid from the reservoir to the source when in the first, filling position and allow the flow of liquid from the reservoir to the source when in the second, emptying position.

Abstract: A coupling mechanism is disclosed for coaxially connecting a pair of connectable components, such as a pair of transducer assemblies each having a stator. A coupling ring is carried by one stator and engageable with the other for drawing the stators together axially in response to relative rotation of the coupling ring. First friction mechanism between the stators prevent relative rotation between the stators after the stators are aligned angularly to align the electrical zeros thereof. Second friction mechanism of lesser coefficient of friction between the coupling ring and the one stator permit relative rotation therebetween whereby the stators can be finally coupled by further rotation of the coupling member while the first friction means maintains the stators in zero electrical alignment. Subsequently, locking washers are fastened between the coupling ring and stators to permanently lock the stators in relative aligned position.

Abstract: A process for developing porosity in air impervious film. The process is disclosed for fabricating a cushion article having a cover provided with increased air flow capabilities. A covering is provided for a cushion body, the covering including a laminated film and, preferably, an outer fabric layer. The film includes a first layer having a relatively high temperature melting point and a second layer having a relatively low temperature melting point. The first layer includes perforations, and the second layer is continuous and air impervious. The laminated film is heated at a temperature which approaches or is above the melting temperature of the second layer but below the melting temperature of the first layer to melt the second layer at least in areas coincident with the perforations in the first layer to form air flow passages through the film laminate.