Dispensing – Drip – leakage or waste catching or disposal
Patent
1993-12-21
1995-07-04
Shaver, Kevin P.
Dispensing
Drip, leakage or waste catching or disposal
2223218, 222340, 222380, 222496, B65D 3700
Patent
active
054292751
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a liquid and paste dispenser and more particularly to a finger operated paste dispenser.
A paste dispenser of similar type is described for example in EP 0 230 252 A2. In this case suction and pressure valves are formed as hinged flaps, of which the opening and closing function can be affected by the hinging and adhesive forces. Furthermore there are no measures cited, in order to attain a tight closure of the discharge bore with gas emitting media.
It is an object of the invention to propose a paste dispenser of the generic type, which produces an intensive suction effect with simple means, in order to achieve a high filling degree of the pump room in connection with mechanical aids, which additionally support the valve function and in order to guarantee emptying of a storage container, which can be changed by underpressure.
It is furthermore an object to open a closure, coupled with the actuating key, of the discharge bore before the start of delivery and to close it after the end of delivery.
The advantages attainable by the invention consist in that a paste dispenser, which can be manufactured with simple means, can be manually operated by finger pressure, and that measures for attaining a high suction effect permit the combination for example with commercial tubes serving as storage containers, whereby the medium can be protected against drying-in and gas losses by a controllable closure, and that environmental pollution is fought by reusing the metering head.
In a further embodiment of the invention it is advantageous for attaining a high suction effect to have the dead space in the lowest plunger position tend toward zero, if possible, and on this occasion to produce a contact zone between the pressure valve and the suction valve, in order to open the suction valve as soon as the suction lift starts not only by underpressure, but also by adhesive forces, which are created in the contact zone by cooperation of the pasty mass. In like manner the pressure valve meets an additional sealing force with the start of the suction lift. Within the opening lift of the suction valve, which is defined by stop edges on guide segments, the suction valve is longitudinally moved together with the plunger, so that the underpressure produced by the plunger is available in its full strength for taking in the paste and not only for elevating the suction valve.
A further embodiment of the invention shows that the contact zone for driving the suction valve with the start of the suction lift is effected by means of a plug cone, which adjoins the valve seat of the pressure valve and to which a corresponding bore in the suction valve is associated. The suction valve is opened by the positive locking of the plug cone connected with the suction valve, as soon as the suction lift of the plunger starts. Simultaneously, the closing pressure of the pressure valve is increased to the same extend.
A further embodiment of the contact zone between the pressure and the suction valve shows a friction bar fixedly connected with the pressure valve, which penetrates a bore of the suction valve, the fit being such that closeness as well as friction are produced. In this connection, the opening and closing movements of the suction and pressure valve are supported during both the suction and the delivery lift.
A further embodiment of the pressure valve consists in that for attaining an untilted longitudinal guide, guide webs are molded on the conical pressure valve seat, and that with an embodiment in a plastic material a spring bar is molded on, the lateral swinging-out movement of which produces the spring potential, which supports the closeness of the pressure valve during the suction lift.
As far as the subject matter of the invention is provided for media, which require a special closure of the discharge bore because of drying-in or gas emissions, then a lever key is provided for this purpose, which in simple manner has a double function, and which on the one hand brings the closure element into its open position
REFERENCES:
patent: 3154224 (1964-10-01), Wakeman
patent: 4793522 (1988-12-01), Corsette
patent: 5052592 (1991-10-01), Wilken et al.
patent: 5273191 (1993-12-01), Meshberg
patent: 5301850 (1994-04-01), Gueret
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