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US 4,307,475 AGranted
Vacuum cuspidor
AssigneeA-dec, Inc.
InventorTheodore E. Schmidt
Life of this patent
Estimating the term…
Abstract
The specification discloses an improved dental cuspidor having a vacuum drain means. The specification also discloses a drain having a drain chamber of which one side is formed by a diaphragm so that when water reaches a given height in the chamber, the diaphragm actuates an air valve to drive a piston to open a drain valve to a vacuum drain.
Claims1
An improved dental cuspidor,
- a cuspidor bowl,
- a drain means for the cuspidor comprising a cylindrical trap body having an open vertical side,
- diaphragm means closing the vertical side,
- a drain opening in the side wall of said trap body,
- a poppet valve for closing said opening including a stem extending exteriorly of said body and adapted to be grasped manually for manual operation of said poppet valve,
- spring means operatively connected to said poppet valve and biasing the same to closed position,
- a cylinder encompassing said stem and a piston on said stem slidably engaging the cylinder wall,
- a source of fluid under pressure connected to said cylinder to cause said piston to move said poppet valve to open position against the bias of said spring,
- and valve means actuated by the diaphragm means for controlling the flow of fluid from said source to said cylinder.
6 more elements
Dependencies are inferred from the claim text.