Patent ID: 6371339
Filing Date: 2002-04-16
Classification: B05C,G01F

Abstract:
An apparatus for dispensing small metered amounts of liquid onto a medium, the apparatus comprising: a housing; an elongated valve having a lower end and mounted in the housing, the elongated valve and housing defining a chamber for receiving liquid; a nozzle fluidly coupled to said chamber for receiving liquid from said chamber and having an outlet for dispensing the received liquid onto the medium; a valve seat between said chamber and said outlet of said nozzle; and means for axially moving said elongated valve between a sealing position in which said lower end of said elongated valve is in said valve seat to substantially seal said chamber from said outlet of said nozzle, and a dispensing position in which a fluid passage is open between said elongated valve and said outlet of said nozzle to allow material to flow from the dispenser;wherein said elongated valve is part of a drive shaft, and said moving means includes: a retainer clip rigidly coupled to said drive shaft; and a piston disposed around said drive shaft and positioned at least close to said retainer clip, said piston being axially movable relative to said drive shaft to contact said retainer clip for axially moving said retainer clip, said drive shaft, and said elongated valve.