Dispensing – With discharge assistant – Container with follower
Patent
1987-07-13
1989-10-17
Rolla, Joseph J.
Dispensing
With discharge assistant
Container with follower
222 47, 222 50, 401176, B67D 542, B67D 522
Patent
active
048741159
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a dispenser and, more particularly, to a dispenser for pasty or flowable media which includes a container having a delivery opening, a piston displaceably guided on a wall of the container in forming a lower seal for the filled material, a guide part formed by the container wall on the other side of the piston, and a device with an externally located handle for displacing the piston in a direction of the delivery opening.
Dispensers of the forementioned type are particularly used for pasty medium such as toothpaste, cosmetics, and also for foods such as, for example, mayonnaise, mustard, etc.
Dispensers have been proposed wherein the piston travels upwards in the container through a type of pumping movement on an externally accessible pressure piece due to an overpressure or underpressure and advances the filled material or charge before it. The filled material is always discharged in a portionwise manner. Additionally, such dispensers require valves at the delivery opening in order to produce an underpressure or maintain an overpressure. Thus, dispensers such as proposed in, for example, DE-OS 29 01 717 and DE-OS 31 05 859 comprise a plurality of components which must be closely toleranced thereby resulting in a dispenser which is complicated and prone to failure.
Additionally, in, for example, DE-OS 29 41 416 and DE-OS 30 07 480, dispensers are proposed wherein the piston is additionally secured to prevent a retraction or sliding back following the stroke or lifting movement, in that it is, for example, constructed in the manner of a climbing piston, which is locked by expansion parts, locating devices or disposed on a guide rod/or on the container inner wall. These constructions are also complicated and lead to sealing problems. Furthermore, in, for example, DE-AS 16 07 905 and EP-OS 0 053 329, dispenses or propose wherein springs are provided for preventing the piston from dropping.
However, these pump-like functioning dispensers have a complicated construction and are also prone to failure. Additionally, they generally only permit a portionwise delivery so that they have to be operated several times when a larger quantity is to be dispensed.
Finally, dispensers of the aforementioned type have been proposed wherein the piston is mechanically moved by an external actuation, with the lifting movement being directly manually produced (German utility models 79 08 402 and 82 29 055) or by mechanical transmission means. The first-mentioned construction suffers from the disadvantage that the container becomes ever shorter on emptying. In a known construction of the latter type (DE-OS 30 26 659), a rack is connected to the bottom of the piston and is located in a guide part connected to the container. With the rack cooperates a pinion, which is mounted in the guide part and can be rotated from the outside. However, problems are caused in this case by the guidance of the rack, as well as by the mounting of the pinion. However, it is advantageous that the filled material can be dispensed in random portions. However, it is only possible to operate it with two hands, so that for many uses, e.g. for toothpaste, the dispenser cannot be used and can only be used to a limited extent for other purposes, e.g. for cosmetics and the like.
On the basis of dispensers of the latter construction, the aim underlying the present invention essentially resides in providing a simple and more operationally reliable dispenser formed from a minimum of components, which permits both a portionwise and a continuous dispensing of the material.
In accordance with advantageous features of the present invention, a dispenser for pasty or flowable media is provided which includes a guide part with a container of the dispenser having an axially parallel downwardly open slot corresponding to a total stroke of the piston and wherein a device for displacing the piston as formed from a double-walled slide guided on a guide part and engaging on the piston and which roughly corresponds to
REFERENCES:
patent: 1027127 (1912-05-01), Harvey
patent: 1818840 (1931-08-01), Butler
patent: 3325061 (1967-06-01), Ellsworth
patent: 3459340 (1969-08-01), Smith
patent: 3749284 (1973-07-01), Kloehn
Coronet-Werke Heinrich Schlerf GmbH
Reiss Steven M.
Rolla Joseph J.
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