Dispensing – With discharge assistant – Fluid pressure
Patent
1991-06-11
1993-05-11
Kashnikow, Andres
Dispensing
With discharge assistant
Fluid pressure
29450, 222369, 2224021, 264242, B65D 8314
Patent
active
052093794
DESCRIPTION:
BRIEF SUMMARY
1. FIELD OF THE INVENTION
The present invention relates to a method of assembling a pressurized or spray dispenser provided with a pump device for pressurizing the interior of the dispenser, said dispenser comprising, firstly, a liquid container of plastic or similar material with a cylindrical pump tube integral therewith and, secondly, a handle provided with a piston which is mounted on a piston stem and is displaceable in the cylindrical tube, said piston having an abutment surface for determining the outer end position of the piston. The present invention also relates to a pressurized dispenser for carrying out said method.
2. BACKGROUND OF THE INVENTION
It has been a goal in recent years to replace the previously used propellent gas freon in pressurized spray dispensers with other propellents which are less detrimental to the environment. One obvious alternative is to pressurize the dispenser container with ambient air by means of a pump built into the dispenser. Such spray dispensers are previously known and are generally made of plastic material. In order for the pump device to function throughout the entire life of the dispenser, the piston stem must be centered and prevented from lateral movement by a relatively hard and wear resistant plastic bushing or retainer ring. Canadian patent specification No. 1 004 641 describes such a bushing or retaining ring which fulfills the functions just mentioned. This known element has, however, the disadvantage that it is separate from the container and requires mounting on the piston stem between the piston and the handle. It is impossible to force the piston through the bushing or retaining ring without destroying the sealing surfaces of the piston.
SUMMARY OF THE INVENTION
The purpose of the present invention is to achieve a pump spray dispenser and a method of assembling the components of such a dispenser which are much simpler and cheaper than what was known up to now without sacrificing the requirement of rigid centering and guiding of the piston stem in the cylinder tube. This is achieved by a method of the type described by way of introduction which is characterized in that prior to assembly, a mandrel is inserted into the cylindrical tube thereby bending towards the interior end of the cylindrical tube a plurality of projections arranged on the inner surface of the cylindrical tube and directed substantially towards the central axis of the tube, whereafter the mandrel is removed and the piston on the piston stem is inserted into the cylindrical tube, whereafter the projections resiliently recover until they are in contact with the piston stem to center the same and determine together with the abutment surface the outer end position of the piston. A pressurized or spray dispenser for carrying out the method comprising a liquid container of plastic or similar material with a cylindrical pump tube integral therewith and a handle provided with a piston mounted on a piston stem and displaceable in the cylindrical tube, said piston having an abutment surface for determining the outer end position of the piston, is characterized in that a plurality of projections directed substantially towards the central axis of the tube are arranged on the interior surface of the cylindrical tube, said projections being bendable towards the interior end of the cylindrical tube and having a resilient recovery towards their original position which is sufficiently slow to permit the insertion of the piston past the projections which are still bent towards the interior end of the cylindrical tube without damaging the piston.
BRIEF DESCRIPTION OF THE DRAWINGS
In order to facilitate understanding of the invention, the method and the dispenser for carrying out the method will be described with reference to a number of drawings, of which:
FIG. 1 shows in longitudinal section an illustrating example of a spray dispenser according to the invention in its assembled state,
FIG. 2 shows in longitudinal section and in a somewhat larger scale the container with the cylindrical t
REFERENCES:
patent: 3955720 (1976-05-01), Malone
patent: 4093108 (1978-06-01), Hein et al.
patent: 4341330 (1982-07-01), Mascia et al.
Inter Airspray Sweden Aktiebolag
Kashnikow Andres
Kaufman Joseph A.
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