Dual chamber, continuous action dispenser

Claim 1

A trigger operated dispenser, comprising: a body having means thereon for connection to a container of material to be dispensed; a resiliently yieldable pumping chamber carried by the body for receiving material from the container and pressurizing it; a trigger actuator pivotally carried by the body and having a plunger extending into the body into engagement with the pumping chamber to actuate the pumping chamber to pressurize material therein; and an expansible accumulating chamber carried by the body in communication with the pumping chamber to receive pressurized material from the pumping chamber as the material is being pressurized by the pumping chamber for discharge from the dispenser, said accumulating chamber enabling a continuous discharge of material from the dispenser by providing a reservoir of material for discharge while the trigger actuator is being moved to enlarge the pumping chamber on an intake stroke of the trigger; a discharge nozzle on the body for receiving material from the accumulating chamber; and said accumulating chamber having an inlet from the pumping chamber and an outlet to the nozzle, and including a flexible, resiliently yieldable diaphragm extending across the pumping chamber, a peripheral portion of the diaphragm extending across the outlet from the accumulating chamber and comprising an outlet valve means, said peripheral portion disposed against said outlet in closing relationship thereto when the pressure of material in said accumulating chamber is below a predetermined minimum, and an outer peripheral part of the diaphragm being secured to the body.