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AssigneeDüRr Dental SE
InventorHans-Joachim Hofmann
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Dental suction apparatus is a modular construction, made up of a plurality of modules joined fluid-tight side-by side. A main suction duct extends through all of the modules. At least two of the modules have connection for suction hoses each having a suction nozzle, holders being provided on the modules for holding the suction nozzles when not in use. At least one module has a filter chamber connected between a suction tube and the main suction duct. A removable filter unit in the filter chamber has a basket-shaped filter on a stem by means of which the filter can be removed through on opening closed by a hinged cover. A cap on the stem provides a seal for the filter chamber. Flow of air from the suction tube of each suction tube module to the main suction duct is controlled by a valve in the form of a bellows provided with a telescopic guide and with a control valve for controlling the expansion and contraction of the bellows by differential pressure.
Dental suction apparatus comprising a plurality of modules assembled side-by-side to constitute an assembly, each of said modules having a suction duct extending from one side to the other and connecting with the suction duct of at least one other module to constitute a main suction duct connected to suction producing means, each of at least two of said modules having means for attachment of a suction nozzle tube and with duct means connecting said suction nozzle tube with said main suction duct, and further having means for removably holding a suction nozzle, a suction nozzle tube connected with said attachment means and a nozzle on said tube, valve means for shutting off said suction nozzle tube from said suction duct and means associated with said nozzle holding means controlling said valve means to shut off said suction nozzle tube from said main suction duct when the respective nozzle is held by said holding means.
Dental suction apparatus according to clalim 8, further comprising a control valve on said nozzle and a control duct extending through said suction nozzle tube from said control valve to said bellows means, said control valve being operable to admit a controlled flow of atmosphere air to said bellows means to control expansion of said bellows means and thereby control the suction applied by said main suction duct to said suction nozzle tube and nozzle.
Dental suction apparatus for applying suction comprising a case, a suction duct in said casing, means on said casing for attachment of a suction nozzle tube in communication with said suction duct, a suction nozzle tube and nozzle attached by said attachment means, a filter chamber in said casing, passage means connecting said filter chamber with said suction duct and with said suction nozzle tube, an openable cover for said filter chamber, and a removable filter received in said chamber in such position that air passing from said suction nozzle tube to said suction duct flows through said filter, said filter having handle means for removal of said filter from said filter chamber when said cover is open.
Dental suction apparatus comprising a casing, a main suction duct in said casing, means for attachment of a suction tube to said casing, passage means for connecting said suction tube to said main suction duct including a valve chamber having a valve seat, valve means in said valve chamber for opening and closing said passage means, said valve means comprising a corrugated expansible bellows provided with a sealing lip engageable with said valve seat to close said passage means and thereby cut off suction from said suction tube, and means for controlling the expansion and contraction of said bellows.
Dependencies are inferred from the claim text.