DE1425873A1 - Aerosol valve assembly - Google Patents

Description

Spr and osenventilanoränun: ™,

The Lrfindunr; generally affects packs that one under Pressure, standing .Product included, and in particular a Valve arrangement for use: with such Pac'.unn-en. the Type of packing »with the die erfindunpcssep.c.sse valve arrangement verv: is usually referred to as an aerosol can.

Such a spray can usually consists of a steel container, which is built in such a way that it can absorb the pressure to which it is normally exposed. This container owns an upper opening with a lip rolled outward. The entrepreneur who fills the can (i.e. the bottling plant) and who normally completes the can acquires the

809809/0021

container from the one source and the valve mechanism for inserting into the container of another.

The manufacturer of the valve mechanism delivers to the bottling plant a lid sealingly on the opening; of the container can be put on and the entire valve mechanism wearing. The bottling plant therefore fills the pack with the pressurized product, for example with one Paint in a carrier of a suitable type and with a suitable propellant, for example with a low boiling point Gas. This material can be introduced into the container before the lid of the valve mechanism is put on will or after. There are several different ways to fill the container. For a valve assembly, it is it is best to use one of these filling methods: ■ '; .-.,. can. "■■■ -,

There are two main types of valves ^ for use with aerosol cans known. In which. one type is a valve piston, which is fully in an approach which is in Lid is formed and. has a recess that is open to a corresponding opening in the lid. In this design, the spray head has a hollow which is directed downwards Shaft with an axial slot and this shaft must pass through the opening in the cover and an annular rubber seal with

BAD OBSiMAL 80 98 0 9/00 21

ef-fnunr: -und. the recess into the ir: i valve piston eaisfebilclete recess can be used. By the Hieclerdrnc '-'- en of the spray head therefore the shaft is pressed downwards and the slot to the inside of a valve turn; .uses freitele ^ t, which is attached to the Attached to the inside of the neck and r: it the lower end the can is connected by means of a dip tube.

In the second type of known valve, the valve piston and the shaft consist of a stic 3 ... The shaft rains with its outer end continuously through the opening of the attachment, so that the spray head is only a button with a recess with which the button is placed on the protruding shaft. In this type, in which the inner I'.nde of the shaft is connected to the valve piston, mu & te a bore in the shaft to expose the interior of the valve; "ehäuses, ^T w hen the stem is depressed, are prepared.

Each of the valve arrangements described above has its own ll disadvantages. The first type is comparative because of its complicated structure expensive to manufacture and also comparatively expensive to assemble because of difficulties in inserting the stem pointing downward from the spray head insist in the opening of the neck during assembly. The second type described above is inherently

809809/0021

Actually cheaper, but not as versatile as the valve arrangement, in which the shaft is provided with an axial slot which can easily be designed so that the material to be sprayed is metered in the desired manner and, in particular, clogging is reliably prevented » if heavier substances such as color ₆ starch, wax and similar suspended solids are used «, By metering a predetermination of the spraying speed is to be understood, ie the amount of spray material released per unit of time The formation of the bore in the aforementioned second type of valve arrangement is too easy to clog up, so that it is unsuitable for the delivery of heavier substances of the aforementioned type »

The object of the invention is to create a valve arrangement for aerosol cans, which have the best properties of both Valve types are combined and the valve arrangement anyway can be produced at low cost «

The invention therefore relates to a spray can valve arrangement with a Γη of the rest position of the valve by means of an end face designed as a valve seat under the effect a spring resting against a sealing body and preventing the spray from escaping from the spray can.

809809/002

derenden valve piston and with a shaft, at one free end of which a spray head can be attached, the shaft has an axial bore with an inner and a lower end adjacent to the free shaft end, as well as with a Calibrated cross-section of the opening arranged in the exit path of the spray means for the predetermination of the per unit of time outflowing amount of spray "The invention differs from this arrangement in that the shaft one located in the exit path of the spray, its wall radially penetrating and calibrated directly to the opening Cross-section has subsequent axial section, which, based on the outer end of the bore, extends into a Beyond the opening and beyond the valve seat area extends, and that the stem is a material unit forms with the valve piston.

Further details and advantages of the invention emerge from the following description of a preferred embodiment in connection with the accompanying drawings, namely show:

Figure 1 is a partial side view of a spray can equipped with a valve assembly from which View of the surroundings can be seen in which the valve arrangement according to the invention can be used;

809809/0021

Pig «2 is a view in section on an enlarged scale the line 2-2 in Pig »1 and in the direction indicated;

Pig »2a a view of the in Pig. 2 spray head shown in section along the line 2a-2a in the specified Direction; ·.

Pig, Fig. 3 is a view in longitudinal section of the valve piston and the Shank in pig. 2;

Pig, 4, 5 and 6 views in radial section along lines 4-4, 5-5 and 6-6 in Pig * 3 in the direction indicated;

Pig «7 a view of the piston and stem in Pig. 3 from the bottom to level 7-7 in the direction indicated;

Pig «8 shows further details of the valve mechanism on an enlarged scale according to Pig «2, the spray head with the shaft and the piston in the depressed position Position so that the pressurized product can escape from the container »

Pig. 9 is a view similar to that of FIG. 2, but of a different type Embodiment of the invention ^

809809 / 002-1

Fig. 10 is a view similar to Fig. 3, but different Embodiment of the invention;

11 shows a view * similar to FIG. 4, but in section

according to the line 11-11 in Fig. Io and in the indicated Direction;

Figure 12 is a sectional view taken along line 12-12 in Figure 12 and in the direction indicated;

13 shows a view of the valve piston and the shaft according to FIG. 10 from below, but without the inner end
the axial bore through the shaft closing element;

14 shows a side view of the closing element according to FIG.

FIg. 15 is a view similar to FIG. 13 from below of the built-in closing element for the axial bore in the
Shaft.

In Fig. 1 the upper end of the spray nozzle is shown which
is indicated generally at 2o and is formed by a cylindrical container 22 having an upper dome-shaped portion 24

809809/0021

becomes, which latter ends with a rolled lip 26, so that an open-topped end 28 is obtained which is closed by a cover 3o on which the valve mechanism is arranged »

The lid 3o is made of sheet metal and has a cup-like shape with a rolled lip 32 on its upper edge, which can be pressed onto the lip 26 and sealed by a suitable sealing material 34 provided in the lip 32 by the valve manufacturer * The lid has a recess 36, in the cement of which a substantially cylindrical extension 38 with a central opening 40 is formed in its upper wall 42. The extension 38 is pressed onto the outwardly widening upper end 44 of a valve housing 46 which is directed downward from the interior of the extension 38. The impressions are shown at 48 in the drawing.

The housing 46 is sealed at its upper end by means of a rubber-like seal 5o which is arranged between the upper wall k 2 of the extension 38 and the enlarged upper end 44 of the housing 46.

The lower end of the housing is at 52 to the upper end of a flexible, immersion tube 54 retracted, which is down to

8Q98Q9 / Q021

-G-

one corner of the can 22 extends so that the pressurized Material up the rope and into a chamber 56 ir,: can get inside the housing »

Within the chamber 56 is one indicated generally at 5-3 Valve piston arranged, the design of which is best shown in Fig. J5 7 it can be seen that although the piston is an integral part of its own, it will, as will be described in more detail below, from made in two parts.

The bulb consists of an enlarged, essentially cylindrical shape Body 6o, which is always inside the housing 46 is located, and from a projecting hollow shaft 6l consisting of one piece, which is secured by a suitable, opening 65 provided in the seal 5o and through the opening 4o in the wall 42 extends. The seal 5o usually has the shape of a flat washer, which .Jedoch after when assembled with the valve mechanism assumes approximately the form shown in FIG. 2, "

As can be seen, the shaft 61 is slidable and sealingly in FIG the opening 65 of the seal 5o inserted »

The body 60 of the valve piston 58 has an annular

BATH ORIGINAL 809809/0021

-Ιο-

Valve seat 62, which is located from the shaft 6l by an annular groove 6h at a distance, the purpose of which is explained below? is purified. The lower end of the body 6o has a reduced diameter, as shown at 66 , so that it has a shoulder 68 for the support of a coil spring 7o which is arranged in the canine 56 and which is supported at its lower end at 72 "The spring loads the piston 58 upwards so that the seat 62 is normally held in firm contact with the underside of the seal 5o. The pressurized material cannot exit the chamber 56 while the piston is in this position.

In the body 6o an inner slot 7 ^ is provided which connects the annular groove 6k and the bore 76 of the hollow shaft with one another. If the shaft ul is pressed downwards and the valve seat 62 is thereby lifted from the seal 5o, the conditions shown in FIG. 3- exist. The pressurized material follows the line indicated by the arrows, in.,. the groove 64 ,. through the slot 74 and through the bore-76 to the outside. A suitable push button 8o, which can be compression-molded from one piece of plastic, has a recess 82 for receiving the upper end of the shaft 6l, which recess nit a narrow Ilänal-. The pressurized material is sprayed out of the open ZG when the push button 8o is opened.

80980 9/0021

is pressed. Optionally, the outer Zumessunp or mechanical disruption of the emerging can "aterials by a suitable use in üprühkopi? Be regulated in a known per se Ueise.

The only part of the slot 74, the zuraißt the light passing through the slit material, the upper end of B ⁰ and by regulating the ^ uerschnittsfläche this part of the slot, the manufacturer can control the flow rate.

The use of the arrangement in which an annular groove is provided is advantageous because at the moment in which the slightest lift from the seat takes place, there is a large overcut is through which the material .in the annular groove and through the upper end S8 of the slot 74 can pass through. The slot 74 is advantageous because when spraying heavy material these materials die have a tendency to continuously drain down to the bottom of the slot, thereby keeping the top clean will.

■ As can be seen from Fig. 3, the valve piston 58 has before his full completion a cylindrical recess 9p on his lower end, the inlet of which is preferably widened, as at

; \ 'BAD ORiGiNAL

L 809809/0021

92 shown. As a result, sufficient space is obtained for the introduction of shaping tools for the formation of the slot Ik and the bore 7ö from the lower end of the workpiece. The production of the annular groove can easily be done by placing four-wheel shaping tools in front of the upper end of the workpiece. After the workpiece has been shaped, a cylindrical plug or plug head 9 * 1 is pressed into the recess 9 ° - until it comes to rest at 96. This completely closes the lower end of the bore 76 and part of the valve piston 53. The recess 98 helps to enable the materials coming up from the dip tube to pass through the chamber 56 past the spring 70. As mentioned, the spring surrounds the portion 66 of reduced diameter and supports the. Spring against shoulder 68. ~

The embodiment shown in Fig. 9 is that in conjunction very similar to those described with Fig. 2-8 with a few exceptions. _ - ·

In the valve arrangement according to FIG. 9, a plastic housing is first used 46 used and the dip tube 5 ^ is in the lower End of the valve housing with the help of a split sleeve loo secured, which rests against the housing with friction «

Second, the piston body 60 has no design like the ring

BATH "ÖflfÖINAL

8 0 9 8 0 3/0071 -

nut 64 in J ⁷ Ig. 3, but it is the valve seat 62 of the stem

61 immediately adjacent. With such a design must

without the use of an annular groove the upper l-inde of the slot 74, shown at 88, extends above the valve seat

62, and partially enter the seal 5o when the spray button 8o is depressed. In the arrangement according to i ^? ig. 9, the upper end ° 8 of the slot 74 above the valve seat 62 is exposed and the materials coming from the chamber 56 can enter the slot at this point *

In the case of the arrangement shown in FIG. 9, a uniform Spraying can only be achieved by a jerky depressing of the button to the greatest possible extent. on the other hand a greater or lesser amount of the top end '83 of the slot 74 is exposed, thereby dispensing is changed.

Pig. Io - 15 show a further embodiment of the invention, which apply the same principles outlined above and which have the same advantages and perhaps has additional features, which are described below become »There. the design of the piston is the only thing that undergoes a change, show the Pig. Io - 15 just the piston. The piston is indicated generally at 158, ut it from the

809809/0021

Construction according to 7i ~. 2 - 9 to be distinguished. The body l6o h ± a much shorter axial length and the cylindrical one Bore 19o has a much larger diameter ”(As As can be seen, the reference numerals are those previously for the same Parts used similarly except that the digit "1" has been prepended). The piston 158 has a hollow shaft! oil with an Eohruns 176> which serves as the usual expansion chamber. The valve seat is shown at 1d2 and is located from the lower end of the shaft 161 by an annular groove 1ü4 at a distance.

The Ilaup tunter differentiated between the piston 158 and the preceding ones described consists de.rin that the metering through an opening at the bottom of the hat 164 instead of in the side wall of the shaft is regulated, as is the case with the two embodiments described above. As shown, the body 160 is provided with a radially extending; Slot 17 ^ provided, the upper axial end of the base I65 the annular groove 164 begins and the lower axial end of which opens into the hollow bore 190 of the body 160. The metering regulating orifice is shown at 183.

Another main difference between the design of the piston 158 and the designs described above is that that the body 160 was simplified by the fact that the necessary

80 980 9/0021

ability of a spring seat on these is avoided and this spring seat is instead provided on the plug head. The mustard pool of the body is simple and cylindrical and the bore 19o is also concentrically cylindrical. The entry end is formed with a guide extension 192 and preferably an annular rib 193 is provided on the inner surface of the bore 19o, while a further rib 195 is provided on the surface 196. These ribs are rather narrow, and are fractions of a ^ tillirr.eter (a few thousandths of an inch) thick. If the plug head 19 ² J is pressed into the bore 19o, these ribs serve to produce a flow-tight and permanent connection. The rib penetrates into the side wall of the plug head 194 and gradually deepens by cold flow into a permanently secured position. With the rib 195 kit, the same thing happens at the top of the plug head 194. The possibility that pressurized material can get past the plug head 194 is thereby substantially reduced, if not completely eliminated.

The plug head 194 x ^ e is a portion 166 of reduced Diameter, which is through a central recess; is divided so that pressurized product can bypass the spring can that sits on the part 166 and is against the shoulder 168 is supported, which is supported by the part 166 of reduced diameter

809 809/0021

; _; : esser formed irlro ..

Through the form of the plug head 19 ^ this becomes opposite the previously described simple Ctöpsellcopf OV not v: esentIicn more controversial, but vrirö. the forum number. " of the remaining piston 15 "': e.; -: en simplified over the piston 5 °.

The embodiment shown in FIG. 10-15 is also advantageous in other respects. At ^r r. Pre remote ^p, it is easier to remote small Cffnunf.en at the points at .welchen parts of the die together to riäche surface kor-nen, as if this --ffnunn-en are provided in a plane '.reiche by Parts that move in relation to one another are re-forms. The arrangement with the orifice l? ^q at the bottom of the annular groove 3.64 is therefore more reliable and easier to manufacture than the other embodiments described. Furthermore, it is most advisable with press-forming technology if the parts are as large as possible, in order to prevent breakage and changes in dimensions due to bending and, more importantly, to make the parts easier to manufacture. In the arrangement according to FIGS. 10-15, larger compression-molded parts are used than in the other embodiments.

In Fig. Io, the mandrel which forms the slot 1-4 is quite large and robust, since it extends radially from the bore YJ6

80 9 80 9/00

to the left of the T-Jarid of the shaft IuI extends past. In other For women, the thorn was no bigger than the yandstrength of the shaft. It should be mentioned here that vcrhii.ltnisina.ssii: simple is the measurement by a larger radial hatred of the mandrel with which the slot 174 is formed to, change, thereby exposing more of the opening l £ 8 in the base 165 is, or by a r; erinceres radial iTaß of the mandrel whereby a much smaller opening is obtained. In all The thorn is felt quite strongly.

The idea of an axially open ZumefiSffnunp; is new in itself. The metering can be achieved and maintained more easily. The derivation from the ring groove is better.

Materials that can be used according to the invention are plastics, in particular thermoplastics, primarily those of good stability, such as nylon. The plug head will expediently made of polyethylene, because by an occurring Swelling of the plug head is secured even more tightly.

Patent attorney Dipl.-Ing. E- ^Eder

Munich 13, Elisöbethstr. 34

Claims;

809809/0021

Claims (10)

Patent attorney Munich 13, Elisebeth & tr. 34 _i8_ P a t e η t a η s ό r ü c h e: Ii spray can valve arrangement with a valve piston in the rest position of the valve by means of an end face designed as a valve seat under the action of a spring against a sealing body and thereby preventing spray from escaping from the spray can and with a shaft, at one free end of which a spray head can be attached, wherein the shaft has an axial bore with an inner and an outer end adjacent to the free shaft end, as well as with an opening of calibrated cross-section arranged in the exit path of the spray agent for predetermining the amount of spray agent flowing out per unit of time, characterized in that the shaft (6l; ^{löl) has an axial slot (7 1} J; 17 * 0) located in the exit path of the spray, penetrating its wall radially and directly adjoining the opening, calibrated cross-section (88; 188), which, based on the outer end of the bore (76 ; 176), to in 809809/002 1 one beyond the opening (88; 153) and one beyond the Valve seat (62; 162) lying area extends, and that the shaft (61; lol) is a material unit with the. Valve piston (6o; löo) forms. 2. Valve arrangement according to claim 1, characterized in that that the Axialschiit.ζ (74; 17 * 0 extends to the inner end the bore (76; 176) extends and the bore (76; 176) at this inner end closed in the axial direction by a plug head (94; 194) inserted into the piston (6o; 16o) is. 3. Valve arrangement according to claim 2, characterized gekennzeich.net, that the valve seat (62) directly on the outside diameter of the shaft (61) angrerefc and the axial slot (74) in the axial direction from the inner end of the bore (76) protrudes beyond the valve seat (62) by an amount corresponding to the cross-section of the calibrated opening (83) (Pig. 9) * 4. Valve arrangement according to claim 1 or 2, characterized in that that the valve piston (6o; l6o) has an annular recess (64; 164) surrounding the shaft (6l; l6l), which is to ' the end face of the sealing body (5o) facing 809809/0021 Piston (Bo ι - & βο} towards. Is open and is stupid with the Axiälseh'litz (74; 174.) by means of the / opening C881. 18S) " 5 "Valve arrangement-according to claim 4 _ff daduroh. Characterized that 'the axial slot (74) ± ft in an eccentric direction from the inner end of the bore, (76) over the bottom of the annular outlet",.-.-. (£ 4) protrudes and. merges into the recess (64) by means of the calibrated opening (88) (IfIg ₀ 2 ₀ 5 _S 8) _e 6 »valve assembly according -Anspruch- 5 ₈ characterized in" that the Asciälsshlits (74) extends from the inner end of the -. (? 6) hole in the axial direction at most to zurMaaeren-Begrengungs · .fläche the sealing body (5o) extends ₀ /: 7. Valve arrangement according to claim 1 - 6 _$ characterized in that the outer diameter of the plug head (04) is the same as the outer diameter of the shaft (61) * 8 »valve assembly of claim 4 _S .dadurch in that the Längssehlits (1.74) check in the radial Richtung'über the outside diameter of the shank (L6L) also continues in the" bulb (l € o), in the direction of the interior of the axialer- Bore (74) to the "bottom of the annular recess C164) he» 80'9809 / 0021 -21- stretches, and cross-section calibrated by means of the opening (183) merges into the bottom of the annular recess (l64) (Fig. Lo). 9 »Valve arrangement according to claims 1-8, characterized in that the piston (6o) on its. Diehtungskörper (5o) is provided from the facing side with a shoulder (.66) for guiding the spring (7o). 10. Valve arrangement according to claim 1 - S, characterized in that that the plug head (194) at its hole (176) facing side with an approach (166) for guiding the Spring (7o) is provided. 11, a method for manufacturing a valve piston for a valve arrangement according to one of claims 1 to 10, characterized in that the valve piston "(6o * l6o) with the shaft (61} 161) with the recess of the" äagssseiillfczes "(7 * 1 $ 17 ¹ O 'as well as a recess (9o $ 10o) for ate accommodation of the plug head (9 ^ 1 194) on the one hand and the plug head (9 ^ j 19 *) on the other hand as mutually independent elements which are produced and connected to the molds 5 19 ¹ O with one-sided closure of the bore (76; 176) is fitted in the axial direction into the piston recess (9o; 190). DIpI--! Munich 13, Elft / ethstr. 54 KäÄisätSpr