US 3416770 A
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Description (OCR text may contain errors)
17, 1968 D. B. GREEN AEROSOL VALVE UNIT Filed Jan. ll, 1967 United States Patent O 3,416,770 AEROSOL VALVE UNIT Derek B. Green, Manchester, N.H., assignor to Scovill Manufacturing Company, Waterbury, Conn., a corporation of Connecticut Filed Jan. 11, 1967, Ser. No. 608,690 6 Claims. (Cl. 251-303) ABSTRACT OF THE DISCLOSURE An aerosol valve unit comprising a one-piece molded plastic member including a valve head, a spring housing, and an annular fluid receiving chamber outwardly of the spring housing, with a dip tube connection.
This invention relates to aerosol valve units adapted to be attached to the open top of a container.
An important object of the invention is to provide a valve unit which can be manufactured more economically, To this end, the assembly involves a reduced number of parts, the complete unit requiring only four parts; namely: the metal mounting cup, the sealing washer or gasket, a one-piece member molded from plastic material and a spring.
Other assemblies of this general nature involved at least two separate plastic moldings-one for a valve head and stem and another for a valve housing and spring retainer.
Another object of the invention is to provide an irnproved unit wherein the spring can be more easily assembled and after assembly, is open to visual inspection in contrast with prior assemblies of this type where the spring was completely concealed after assembly making it ditiicult to detect defective spring mountings.
It is a further object to provide an improved valve unit which will incorporate the advantages above referred to in an assembly which is adapted for quick pressure iilling in the same manner as disclosed in the patent to Briechle 3,15 8,298.
Other objects and advantages will hereinafter more fully appear.
In the accompanying drawing, I have shown for purposes of illustration, one embodiment which the invention may assume in practice. In the drawing:
FIG. 1 is a vertical section through only a portion of a container equipped with my improved valve unit;
FIGS. 2 and 3 are vertical sections showing the closed and open positions, respectively, of the valve;
FIG. 4 is a central section of a modified form of valve unit indicating the closed position of the valve;
FIG. 5 is a top plan view of the one-piece molded plastic member; and
FIG. 6 is a detail of the spring in plan and side elevation.
The aerosol container 7 may be of any known type having a rolled bead 8. The sheet metal mounting cup is of the usual construction having a bottom wa-ll 9, an outer wall 10, a rim 11 rolled over and sealed to the bead 8 and a central pedestal portion 12. The top wall 13 of the pedestal portion 12 is preferably iiat and has a central opening 14.
The one-piece plastic member combines the functions of the valve member and the valve housing in prior constructions as exemplified by the above-mentioned Briechle patent. The valve head portion may be described as having a seal rim 15, a bottom wall 16 and a hollow stem 17 projects upwardly from the bottom 16. A sealing washer 18 of suitable elastomeric material is seated against the undersurface of the mounting cup top wall 13 and the hole 19 in the washer is aligned with the central opening 14 and sized so as to tit in liuid tight relation with the 3,416,770 Patented Dec. 17, 1968 ICC valve stem 17. Below the valve head proper is the spring housing 20 having an outer peripheral wall 21 which is thin enough to be exible.
The spring housing has a large bottom opening 22 with only a narrow internal shoulder 23 for supporting a spring 24. The spring 24 is preferably of the coned disc type, sometimes called a Belleville spring. It may have a central 'hole 25 fitting around a protuberance 26 and also radial slots 27 to increase the flexibility of the spring.
The plastic member has a comparative thick outer peripheral wall 28 spaced from the seal rim 15 and the spring housing wall 21 to form an annular fluid chamber 29 normally closed at the top by the sealing washer 18. This outer wall 28 is joined to the bottom of the spring housing 20 by a transverse wall 30. The outer surface of the wall 28 has the flutes 31 which connect with an annular recess 32 around the outer edge of the washer 18.
It will be noted that the hole 14 in the cup is somewhat larger than the diameter of the stern 17 so that when fluid is introduced lunder pressure through this opening, the sealing washer 18 may move downwardly against the force of spring 24 and permit fast iiow over the top of the washer, through the recess 32 and the liutes 31.
The assembly is held together by suitable indentations 33 -near the bottom of the pedestal portion 12, such indentations engaging under the corner 34 of the outer wall 28.
Rather than having a central dip tube connection which would interfere with access to the spring housing, I have provided a downwardly extending tubular nipple 35 located to the outside of the spring Ihousing 20 and having a passage 36 at its lower end which joins an upper e-lliptical opening 36a (see FIG. 5) preferably leading directly into the annular chamber 29. In order to keep the nipple 35 completely away from the line of the spring housing 20, the passage 36 is arranged eccentrically to the bottom portion 37 of the connection which must be sized to tit the dip tube 38.
The valve is intended primarily -to be operated by tiltaction. The annular chamber 29 extends completely around the peripheral wall portion 21 so that the valve stem and head can be tilted in any direction. As seen in FIG. 3, the flexible Wall 21 bends inwardly enough to break the seal at 39 between the valve head and sealing washer, thus allowing uid to flow into the valve stern 17 through one or more lateral openings 40 in the stem.
The modification shown in FIG. 4 indicates that instead of the vertical flexible wall 24, there may be provided an outwardly and downwardly flaring wall 21 which will tend to buckle more easily than a straight vertical wall. Such flared wall extends around the spring housing all the way except at the region of the dip tube passage 36a. With this amodiiied Construction, an operating button 42 on the end of the valve stem may be arranged to tilt the valve in the direction away from the dip tube to obtain the easiest action.
It will now be observed that I have provided an improved valve unit which is economical to manufacture not only because of a reduced number of parts, but also because lthe spring can easily be unt in place by an endwise snap action, and once assembled, the spring is open to view so that any improper or defective assemblies may be readily detected.
What I clairn is:
1. An aerosol valve unit adapted for attachment to the open top of a container comprising:
(a) a mounting cup with a cent-ral pedestal portion having `a top wall with a centrally arranged opening therethrough;
(b) an elastomeric sealing Washer seated against the undersurface of said top wall with the hole in the washer aligned with said opening;
(c) a `one-piece molded plastic member which has a valve head normally seated against the underside of said washer, a hollow valve stern extending upwardly from said head through the hole in said washer and through said opening, a spring housing below said head and having a fiexible peripheral wall, said housing having a relatively large bottom opening, an outer peripheral wall joined to lthe bottom of said housing and spaced radially from said valve head and from said spring housing to define an annular fluid receiving chamber, a dip tube connection cornmunicating with said chamber and located radially outwardly from said bottom opening in the spring housing;
(d) a spring supported in said housing and bearing against said head for urging it into sealing engagement with said Washer;
(e) means providing communication between said annular chamber and the interior of said hollow valve stem when said stem is tilted to break the seal between said valve head and washer; and
(f) means on said pedestal portion of the 'mounting cup for anchoring said molded plastic member there- 2. An aerosol valve unit as defined in claim 1 wherein a series of vertical flutes are provided around said outer wall of the molded plastic member.
3. An aerosol valve unit as defined in claim 1 wherein said spring is of the coned disc type having its outer rim bearing on an internal vshoulder at the bottom of said valve housing, the central portion of said spring bearing against the underside of said valve head.
4. An aerosol valve unit as defined in claim 1 wherein said valve head has a circular seal rim spaced outwardly from said valve stem and wherein said flexible wall of the valve housing is in substantial vertical alignment with said rim.
5. An aerosol valve unit as defined in claim 1 wherein said lieXible outer wall of the valve housing flares outwardly and downwardly around the major portion of the spring housing.
6. An aerosol valve unit as defined in claim 1 wherein said dip tube connection has a passage leading directly downwardly from said annular chamber, said passage having a center line offset radially inwardly from the center line of the bottom portion of said connection and wherein a dip tube is fitted around said bottom portion.
References Cited UNITED STATES PATENTS 2,582,262 1/1952 Loven et al. 251-349 X 3,158,298 11/1964 Briechle 251-353 X ARNOLD ROSENTHAL, Primary Examiner.
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