Dispensing – Resilient wall – Supply container delivering to receiving chamber
Patent
1984-02-28
1986-01-14
Skaggs, H. Grant
Dispensing
Resilient wall
Supply container delivering to receiving chamber
222383, G01F 1100
Patent
active
045641307
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a dispenser for paste-like products provided with a headpiece including a discharge channel with a dispensing orifice and with a pump chamber, the volume of which is varied by means of external load, said pump chamber being connected by an outlet communicating path to said discharge channel which can be sealed by an outlet check valve which can be opened only in the direction of the dispensing orifice, and further provided with a container connected to said headpiece, the end of the container which is remote from the headpiece comprising an orifice and the container being internally equipped with a slidable piston moving in sealing engagement along the container interior wall, the interior of the container being connected to the pump chamber by means of an inlet check valve which can open only in the direction of the pump chamber and which is mounted in a support base extending between the pump chamber and the interior of the container.
It is possible using dispensers of the above discussed kind to dispense paste-like materials by means of a volumetric change of the pump chamber induced by an external load, for instance finger pressure applied to an actuation knob connected to a pump piston, and to dispense them in rates depending on said volumetric changes in the pump chamber. Atmospheric pressure is utilized for the purpose of forcing the paste-like mass out of the dispenser, this atmospheric pressure acting on the lower side of the piston sealing the interior of the end of the container remote from the headpiece and which following the generation of a partial vacuum in the pump chamber presses an amount of the paste-like mass into the pump chamber corresponding to the implemented volumetric change thereof. From there this amount will be forced, at the next volume decrease in the pump chamber and by means of operating the check-valves provided, through the discharge channel and out of the dispensing orific. Accordingly there is no need of special propellant means to expel the paste-like substance from the dispensers of the kind above discussed. The dispenser can be actuated with very modest forces, for instance finger pressure.
For economic employment of the dispensers of the above discussed kind and in particular for their use in packaging paste-like products used in large amounts, it is especially important to have the feasibility of economically manufacturing containers of the above discussed type in mass production.
It is the object of the invention to create a dispenser of the kind above discussed with a design of few parts which are sturdy and easily assembled, to be mass-produced economically and assembled efficiently, of which the operation is accurate and free from malfunction.
This problem is solved by the invention in that the inlet check valve is provided with a conical element tapering toward the pump chamber and acting as the valve seat, which is connected by bridges to the support base and which comprises a number of passageways circularly arranged around it between the bridges, and in that further an apertured disk made of a flexible material is provided and mounted coaxially with the conical element, tightly held on the support base at its radial outer area, which in the sealed position rests by its inner rim against the surface of the conical element and thereby covers the passageways.
The dispenser of the invention offers substantial advantages over the state of the art. The inlet check valve consists of two simple-shaped parts which can be manufactured efficiently. One part is the conical valve seat connected to the support base and comprising the passageways arranged peripherally around the valve seat. This part of the inlet check valve illustratively can be produced in great numbers and economically by injection molding. The design of the closure member of the inlet check valve as an apertured disk made of an elastic material also makes it possible to produce it in mass production. Again injection molding is applicable, for instance with elastomers. Furthermor
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Josef Wischerath GmbH & Co. KG
Shaver Kevin P.
Skaggs H. Grant
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