Container, particularly a pressure can for discharging single or

Details Container, particularly a pressure can for discharging single or Container, particularly a pressure can for discharging single or

1985-02-12

1987-03-24

Rona, Joseph J.

Dispensing

Plural sources, compartment, containers and/or spaced jacket

At least one nondispensing

2224021, 22240221, 215DIG8, B65D 8314

Patent

active

046518991

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a container, particularly a pressure can for discharging single or multiple component substances, preferably polyurethane foam, with an additional container receiving further components and which receives a rod cooperating with an internal cover sealed in the additional container, said rod being led to the outside through a packing in an additional container connection connected to the container bottom and is movable into the container for blowing off the cover of the additional container.
The invention more particularly relates to the construction of pressure cans or containers which, apart from the liquid substances of the main component necessary for producing and discharging the polyurethane foam, also receive an additional container connected to the container constituted by the pressure can and which contains the further components. The substances contained in the pressure can are generally liquid and normally comprise a prepolymer, optionally a foaming agent and the liquid pressure gas used for discharging the foam. The further components are present in a relatively small quantity and generally comprise a hydroxy compound with hydroxyl groups, which accelerate the curing or hardening of the foam, so that it only has to take a fraction of the moisture necessary for hardening from the outside air. The further components are introduced into the container through the blowing off of the cover shortly prior to the discharge of the foam and after opening the additional container, through its content being poured into the pressure can. The poured-in components bring about a chemical reaction, preferably a polyurethane reaction, so that a rapidly hardening foam is obtained on discharge from the can.
The invention is based on a known container (German Utility Model No. 82 27 229.8 and international application No. WO84/01355). The pressure can known therefrom has a one-part bottom obtained by shaping a metal blank. The neck of an additional container provided with an external thread is inserted in a recess in said bottom and, with the aid of a nut screwed on from the outside and accompanied by the deformation of a U-ring packing, is braced between a shoulder of the additional container and the inner edge of the bottom recess. The rod led to the outside and sealed by a plungerlike packing within the additional container is constructed as a shaft, which rotates in the additional container neck and is internally supported thereon. If the shaft is driven from the outside, this brings about the positive engagement of its inner end with the additional container cover, which is consequently blown off counter to the internal pressure in the can.
Admittedly pressure containers or cans with a shaped bottom are used to a considerable extent, but the bottom is in such cases not recessed. However, if the bottom has to be provided with an insert in the manner of the additional container according to the prior art, it proves to be unpractical, because it brings about the described bracing with the aid of a nut and a U-ring packing. This requires unacceptable technical effort and expenditure and a corresponding complicated assembly. As a result of the need to blow off the cover against the relatively large internal pressure of the can, the rotary mobility of the rod, i.e. its shaft-like construction leads to the relatively complicated sealing and cover construction. Thus, the expenditure for the advantage of faster hardening of the polyurethane foam is unacceptably high.
The problem of the invention is to simply construct a container of the aforementioned type in such a way that the parts can be more easily fitted to form an undetachable unit, but can be operated with adequate force applied by the user for the blowing off of the additional container cover.
According to the invention this problem is solved in that a disk inserted in a recess in the container bottom and fixed by its beaded edge holds a sleeve penetrated by a rod constructed as an axially movable plunger, the outer and inner edge

REFERENCES:
patent: 2786769 (1957-03-01), Greenspan
patent: 3137414 (1964-06-01), Steinkamp
patent: 3318484 (1967-05-01), Modderno

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