Hand pump for dispensing bottles with shutoff arrangement for preventing

Abstract

A hand pump for dispensing liquids or pastes from a bottle has a hollow, substantially cylindrical or frusto-conical body open at its two ends. The pump also has a tube fitted around its lower end which dips into the substance to be dispensed. An inlet ball valve is located within the hollow body and moves to allow the liquid or paste to be dispensed during a 'draw-in' stage, but closes on termination of the 'draw-in' stage to prevent the liquid or paste from returning to the bottle. A hollow coaxial stem projects from the upper end of the hollow body and has its lower end integral with a piston slidable within the hollow body. A dispenser knob which is affixed to the upper end of the stem has a dispensing channel which communicates with an inner cavity of the stem to thereby form an outlet channel for the liquid or paste. An outlet valve allows the dispensed substance to emerge when the dispenser knob is pressed. The hand pump assembly also has a shutoff element coaxial with and within the hollow body, the shutoff element being movable in both directions within the hollow body, and the shutoff element, when the dispenser knob is in a locked position, mates with a corresponding inner cylindrical surface of the stem to seal the outlet channel within the stem and thus prevent spillage from the bottle regardless of the position of the inlet valve.