Patent ID: 6257451
Filing Date: 2001-07-10
Classification: B05B

Abstract:
A manually actuated pump sprayer adapted to be mounted on a container of liquid to be sprayed upon pump actuation, comprising, a plunger head having a side wall containing a discharge orifice, said plunger head being reciprocable against a predetermined biasing force provided by a first spring, a cover surrounding said plunger head and being independently reciprocable against a biasing force of a second spring less than said predetermined force, said cover having a side wall with a portion thereof overlying said discharge orifice in a condition of non-use, said side wall having an opening adjacent said portion in alignment with said discharge orifice only upon relative shifting movement of said cover against the biasing force of said second spring,the improvement wherein an outer face of said plunger head side wall has an integral circular seal bead extending laterally outwardly of said face to a predetermined extent and concentric with said discharge orifice, andsaid side wall portion of said cover has a smooth inner face bearing against the entirety of said circular seal bead in said condition of non-use to thereby form a fluid tight seal to prevent any clogging of the orifice upon drying of any residual liquid at the orifice.