Piston displacement liquid spray pumps

Fluid sprinkling – spraying – and diffusing – Including supply holder for material – Moving solid surface engages material to be sprayed

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Details

222321, 222385, 239350, B05B 1102

Patent

active

040292614

ABSTRACT:
A piston displacement liquid spray pump comprises a container; a supporting ferrule engaged on the neck of the container, a hollow cylindrical housing supported by the ferrule, and having at least one slit at its upper end to permit air communication between the container and the atmosphere; a stem within the housing; a hollow stem extension telescopically engaged outwardly of the upper section of the stem; an actuator engaging the upper end of the stem extension and capable of biasing it and the stem downwardly; a check valve comprising a seat at the lower end of the housing, a valve chamber above the seat and a bullet-shaped hollow floating valve member; a longitudinal groove along the upper section of the stem and communicating with the hollow extension; a piston slidably movable within said housing and mounted on the lower end of the hollow stem extension with a lost motion engagement to enable the piston to obstruct the groove during its upward stroke and to uncover same during its downward stroke; the piston when the stem is at its uppermost position, being capable of locking the slit to prevent leakage from the container; and spring to bias the stem and the extension upwardly.

REFERENCES:
patent: 3248022 (1966-04-01), Schulman et al.

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