Fluid sprinkling – spraying – and diffusing – Including supply holder for material – Fluid pressure discharge means
Patent
1987-03-20
1989-12-05
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Including supply holder for material
Fluid pressure discharge means
239464, 2395331, 239572, 137517, B05B 134, B05B 130
Patent
active
048847500
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a thrust regulator which comprises a mounting enclosure, this thrust regulator being intended to maintain the flow rates of liquid or cream-like products at values that remain at least approximately constant during the expulsion of these products from aerosol containers by means of compressed gas, in accordance with the precharacterizing clause of claim 1.
It is known that compressed gases, such as, for example, air or nitrogen, exhibit a pressure drop as soon as there is an increase in the volume of the container in which they are stored, such as occurs in the case of an aerosol container from which a product is being expelled. The flow rate of this product decreases in proportion to this fall in pressure. At the same time, when the product is atomized by means of a nozzle, there is an increase in the size of the droplets which are expelled, due to insufficient expulsion pressure.
U.S. Pat. No. 4,487,334 and International Patent Application No. PCT/CH83/00122, published under the number WO 84/01930, describe thrust regulators which modify the flow cross-section of a duct, with the aid of a piston which co-operates with a spring, doing so under the influence of the pressure which expels the product from the aerosol container, in such a way that when the pressure is high, the flow cross-section is small, and increases in proportion to the fall in expulsion pressure.
These regulators, manufactured in molded plastic, nevertheless demand very high precision if they are to function well, in the region of .+-.0.01 mm in the case of a piston diameter of less than 1 mm, such precision being very expensive. In fact, certain solvents, in particular methylene chloride, give rise to swelling of the plastic which is used, and this causes the piston to jam inside the expulsion duct and, in consequence, causes the system to become blocked.
The object of the present invention is to eliminate these problems, and to propose a thrust regulator of the type defined in claim 1, annexed hereto.
In the description which follows, preferred, non-limiting embodiments of the invention are described on the basis of the drawing, in which
FIG. 1 a cross-sectional view of a press-to-actuate head, comprising a first embodiment of a regulator according to the invention,
FIG. 2 shows an exploded view, in perspective, of a second embodiment of a regulator,
FIG. 3 shows a perspective view of a first variant of a regulating disk which a regulator contains,
FIG. 4 shows an exploded view, in perspective, of a third embodiment of a regulator,
FIG. 5 shows a cross-sectional view of a second variant of a regulating disk which a regulator contains,
FIG. 6 shows, a plan view of the regulating disk shown in FIG. 5,
FIG. 7 shows a cross-sectional view of a fourth embodiment of a regulator, before it is used,
FIG. 8 shows a cross-sectional view of the regulator shown in FIG. 7, during use,
FIG. 9 shows perspective views of different variants of the regulating disk,
FIG. 10 shows an exploded view, in perspective, of a fifth embodiment of a regulator,
FIG. 11 shows a cross-sectional view of a sixth embodiment of the regulator,
FIG. 12 shows a plan view of another variant of the regulating disk, placed on an accelerating disk,
FIG. 13 shows a perspective view of the arrangement shown in FIG. 12,
FIG. 14 shows a cross-sectional view of a portion of the regulating disk shown in FIG. 12, greatly enlarged, at rest, and
FIG. 15 shows a cross-sectional view of the portion of the regulating disk shown in FIG. 14, during use.
FIGS. 1 and 2 show a regulator which is housed in a press-to-actuate head 1, associated with an aerosol valve which is not represented. A vertical duct 2, communicating with the valve, opens into a chamber, 4, which exhibits a widened region 5. The chamber 4 is closed-off by a flexible disk 6, which is preferably made of stainless steel, but which can also be composed of a plastic. The flexible disk 6 is housed in the widened region 5, where it is kept in place by means of a rigid disk 7. This disk 7 presents
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patent: 4401272 (1983-08-01), McFron et al.
patent: 4650094 (1987-03-01), Werding
patent: 4708166 (1987-11-01), Kobold
Kashnikow Andres
Weldon Kevin P.
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