Abstract: The device forms part of an automatic control facility by which the water-primed oral suction pump in dental surgery equipment is protected from the effects of low water pressure and power cuts; the efficiency of control is improved by the inclusion of timers (7, 9) that ensure continued operation of the pump and its inlet valve in the event that fluctuations in the water pressure and electrical power levels happen to be of a momentary order.

Abstract: The work rest is typical of those used by dental technicians and goldsmiths, but comprises an air intake point (7) at the side of the work area (4) remote from the craftsman; this connects directly with a suction pipe (5) beneath and is surmounted by a folding cowl (9) consisting in a rear member (10), rigidly interconnecting two side members (11), and a top member (13) hinged between centers near the top edge of the rear member. The entire cowl assembly pivots about a horizontal axis adjacent to the rear edge of the air intake (7).

Abstract: The fitting, which serves for rigid and flexible tube alike, comprises a base (1) to which two arched ribbon elements (4, 5) are hinged in a face-to-face arrangement via intermediate points along their relative external surface; the two elements (4, 5) are fastened together around the tube by causing an inward-facing lip (12), located at the end of one element (4), to engage one of a set of teeth (9) spaced apart at a given distance one from the next along the outer surface of the other element (5). The element (4) with the lip incorporates a lower section (8) shaped so as to breast, at least in part, with the cylindrical external surface of the clamped pipe or tube.

Abstract: The invention relates to a device for shutting off suction generated through the single tubes of dental surgery equipment, which comprises a rotary mechanical obturator (5) located in the grip (1) of the suction tube (2) and attached to a pin (3) that engages in a helical groove (6) offered by the holder (4) in which the grip is replaced whenever the tube is not in use. Pin and obturator rotate as one between an open position and a closed position, the obturator being biased permanently toward the open position by a coil spring (7).

Abstract: A spittle separation and disposal device is disclosed that incorporates a drainage pump and forms part of the suction equipment used in dentistry. The device comprises a separator vessel (1) fitted with a drain valve (2); the drainage pump (8), located downstream of the valve and kept normally at standstill, is set in motion by a control signal from level sensors (9, 10) within the vessel, whenever liquid in the vessel itself rises to a prescribed level. The vessel has a lid (3) provided with an element (14) in the form of a cone frustum the inside of which communicates with a port connected to an air pump, and the internal surface of which exhibits a number of helical starts (15) disposed in opposition to the helical pattern tern of movement of the air which is drawn up through the element by the air pump.