Dispensing – Collapsible wall-type container – Nonmetallic
Patent
1989-11-30
1992-04-21
Shaver, Kevin P.
Dispensing
Collapsible wall-type container
Nonmetallic
222 54, 222 97, 222212, 222215, 222490, 222494, 222564, B65D 3500
Patent
active
051059851
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a tube for adhesive material according to the precharacterizing part of claim 1.
2. Description of Related Art
A well-known annoyance of hobby workers who use tubes containing viscous adhesives is caused by enormeous difficulties in dosing the adhesive that issues out of the tube. On the one hand, it often happens that more adhesive than desired emerges initially, and on the other hand, the discharge of adhesive cannot be stopped with sufficient accuracy. In order to eliminate these disadvantages, adhesives with a different flowability have been developed. Such adhesives however, which have the flow characteristics of a gel, are often not accepted by consumers.
In the case of viscous masses of adhesive, one could use an elastic tube body capable of restoring its former shape, which tube body, after adhesive has been pressed out of it, effects a back suction. However, such a solution would entail the disadvantage that the tube body would not adapt to the decreasing contents, as is the case with a tube made of soft metal. If a tube body capable of restoring its former shape would be used, an empty space would be created within the tube body; this empty space would fill with air which could slowly harden the adhesive in the tube and which could expand under thermal influence and, after removal of the cap, could let the adhesive immediately and uncontrolledly escape due to the overpressure.
It is an object of the invention to provide a tube for adhesive material which effectively prevents uncontrolled issuing of adhesive material and outflow of adhesive material after use of the tube, wherein the commonly known tubes consisting of a tube body and a spout can be used without being altered and need only be provided with an additional device.
SUMMARY OF THE INVENTION
According to a first variant of the invention, an elastic insert with variable receiving volume is placed into the tube. This elastic insert consists e.g. of fibrous wool, particularly steel wool. Such a fibrous wool, being capable of restoring its former shape, exerts a retaining effect on the adhesive within the tube. The fibrous wool reacts elastically on slight pressure and can be completely flattened under stronger pressure. The fibrous wool can fill the whole volume of the tube. The flattened part of the tube maintains the fibrous wool flattend as well. In the part of the tube that is not squeezed off, the fibrous wool, when subjected to slight pressure, releases a portion of the adhesive sucked into it. When the pressure decreases, the fibrous wool sucks part of this adhesive back into the tube so that the flow of adhesive is ended in a defined manner. Thus, the adhesive can be dosed easily and exactly. It is even possible to use the adhesive for applying continuous fine or stronger lines and dots onto a pad.
As fibrous wool, steel wool of the strength No. 5 is particularly well suited. The fibrous wool need not necessarily fill all of the tube body. Moreover, it is sufficient when the fibrous wool is present in the front area of the tube. When fibrous wool is used, the . fibrous wool is introduced into the tube shortly before filling the tube with adhesive so that the tube bodies, having their rear end open upon delivery, can be delivered to the filling site as usual and without alterations.
According to a second variant of the invention, the elastic device consists of a small plate that is supported, e.g., at the level of the tube shoulder and is permeable upon deformation. This plate locks the volume of the tube spout against the volume of the tube body, and it is opened by the pressure of the adhesive. When the tube is subjected to pressure, the plate curves towards the spout, and a slot means lets the adhesive pass. When the pressure ends, the curving decreases, thereby effecting a short back suction. Even in the opened state, the passage width of the slot opening is smaller than the spout opening of the tube. The back suction, being caused due to the e
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patent: 2893710 (1959-07-01), Goodman
patent: 2905364 (1959-09-01), Marraffino
patent: 3107829 (1963-10-01), Makowski
patent: 3643834 (1972-02-01), Sabatino
patent: 3669323 (1972-06-01), Harker et al.
patent: 4121734 (1978-10-01), Soong et al.
patent: 4620648 (1986-11-01), Schwartzman
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