Automatic mixing faucet

Claim 1

A compact automatic water supply device comprising a hollow body defining an outer shell adapted to be located above the surface on which the device is to be mounted, said body having a water discharge outlet, sensing means mounted on said body for sensing the presence or absence of an object adjacent said device; an water supply valve in said body between said base and said water discharge outlet responsive to said sensing means sensing of an object for discharging water from said discharge outlet, said water supply valve including a diaphragm type primary valve, means for holding said diaphragm type primary valve in an open position as long as an object is sensed by said sensing means and for closing said diaphragm type primary valve when an object is removed from the range of detection of the sensing means, and a valve piston having upper and lower ends, said primary valve having a sealing dish selectively cooperating with the upper end of the valve piston to open and close said upper end and a stem extending through said open upper end of the valve piston, and means responsive to said sensing means for selectively tilting said stem to open said valve piston; said water supply valve further including a valve body, a valve chamber formed in said body with said valve piston being slidably mounted in said valve chamber for movement between opened and closed positions, said valve body having a water discharge port communicating with said valve chamber and being closed by said valve piston in the closed position thereof and a pair of water supply ports for supplying water to said camber, one of said ports supplying water to the interior of said valve chamber through it slower end and the other port supplying water to the chamber opposite the cylindrical wall of said valve piston.