Abstract: The present invention uses a pivotally mounted damper to cover the port and provide damping to the boiler furnace. The damper is aligned with and superjacent the rodding mechanism and is supported intermediate the port and the pivotal mounting by a linkage which raises and lowers the damper responsive to linear motion of the rodding mechanism.

Abstract: An ice piece maker has a long tray (100) with an arcuately shaped inner surface divided into full crescent shaped cavities (122) arranged sideby-side along the tray length. A bidirectional rotatable shaft (106) is positioned with its axis coincident with the axis of the inner surface of the tray. Leading and lagging rows of ejector elements (114), (116) are in separate planes with said leading ejector elements (114) extending downwardly into the center of the cavities, herein defined as the 0.degree. position of rotation, and with first ends of the leading ejector elements (114) attached to the shaft and being of a length to leave a space between its second ends and the tray bottom so that an ice bridge (152) can form between the leading and lagging ice pieces. A control controls the shaft rotation to a clockwise direction for X.degree.

Abstract: A pinch valve assembly is described for location between the manifold assembly and the flow adjustment valves of a dental handpiece system. The pinch valve assembly of the present invention comprises a housing having a plurality of passageways extending therethrough for receiving a plurality of resilient tubes therein. A plurality of transverse slots extending from each of the passageways to the bottom of the housing are provided and are adapted to receive a plurality of slide elements in each of the slots such that the slide elements can move reciprocally within the slots. The housing is supported on a base and a flexible diaphragm is located between the housing and the base. A rigid disc rests on the diaphragm and supports the slide elements in the slots. A chamber is provided in the base beneath the diaphragm and connected to a source of pressurized fluid.