LIQUID SPRAYER

Abstract: The present invention relates to a liquid sprayer having a cylinder and a piston, wherein, in order to increase a spraying time period and to simplify the construction, such an arrangement is adopted that the piston stroke is designed to be longer and the liquid sprayer comprises: a working member vertically movably mounted on a main body of a container housing the cylinder; a stem suspended from this working member and inserted into the cylinder; a tubular piston provided at the bottom end of this stem and slidable in the cylinder in accordance with the vertical movement of the working member; a spring provided in the cylinder and urging the tubular piston and the stem downwardly; a push-down spray head provided on the working member; and a discharge valve provided in the working member and allowing the stem to communicate with the push-down spray head in accordance with the push-down operation of the push-down spray head.

Description: The present invention relates to a liquid sprayer of the type defined in the pre-characterizing part of claim 1. A sprayer of this type is known from US-A-4 174 055. As an atomizer for spraying liquid continuously, an aerosol-type liquid sprayer using freon gas is often used. In such an aerosol-type liquid sprayer, freon gas is pressurized in a container body, and by depressing the head of an upper end of a valve tube which is erected in an energized condition from an aerosol-type valve locked in the head portion of the container, the aerosol-type valve is opened, thereby spraying the liquid in the container body out of a spraying aperture through the valve and the valve tube. (US-A-3 806 005). The aerosol-type liquid sprayer is very convenient because pressurized liquid is sprayed out of the opened valve only by depressing the valve tube of the aerosol-type valve. When freon gas used for pressurisation, however, is discharged in the atmosphere, it rises up to an ultra-high altitude and destroys the ozone layer, so that the development of a manual liquid sprayer capable of spraying continuously without using freon gas is expected. Speaking of liquid sprayers in general, an accumulator atomizer as disclosed in Utility Model Laid Open No. 185475/88 is often used. In this accumulator atomizer, by energizing upwards and erecting a tubular member with its lower end provided with a small diameter trunk piston from a small diameter cylinder provided with a suction valve hanging into the container body, by fitting a large diameter trunk piston provided at the upper end of this member into a large diameter cylinder hanging from the lower surface of a depressing head, by forming a discharge valve of a valve body erecting from the upper end of the member and a valve hole drilled in the top wall of the large diameter cylinder, and by depressing said depressing head with respect to the container body, said tubular member is lowered against energization because of pressurization in the large diameter cylinder, thereby opening the discharge valve, and the liquid is sprayed out of the atomizer having an opening in the side face of the depressing head, and because of cancellation of the pressurization the tubular member and the depressing head are raised by said energization with the suction valve being closed when the depressing head is released, thereby opening the suction valve, and the liquid in the container body is sucked into the both cylinders and the tubular member. Such a conventional accumulator atomizer is capable of spraying liquid for a short period of time so that it is necessary to depress the head many times to obtain required amount of liquid out of the atomizer, which takes a great deal of trouble. The present invention made under these circumstances has as its object the provision of an atomizer which is capable of spraying liquid for a long period of time and is constructed simple. The present invention relates to a liquid sprayer comprising the features of claim 1. In this liquid sprayer spraying liquid stored in the container body, the operating member is lifted up at first against the spring. Thus, the trunk piston is raised, thereby generating a negative pressure in the interior of the cylinder, and sucking the liquid in the container body via the suction pipe and the suction valve into the cylinder. When the lifted up operating member is released in this condition, the trunk piston will be lowered due to the elasticity of the spring, thereby pressurizing the liquid in the cylinder. When the depressing spraying head is depressed by depressing the operating member, the discharge valve is opened, thereby allowing the pressurized liquid to flow from the stem into the depressing spraying head and spraying it out of the spraying nozzle of this spraying head. And according to the sprayed amount, the container body is raised by the energizing force of the spring, and is finally returned to the original position thereof. As said discharge valve, an aerosol-type valve is used, having a valve tube connected to said head and being opened when the stem and the piston are depressed by depressing the head. Said aerosol-type valve comprises a valve body having upper and lower ends being opened; and elastic member having a first through-hole sealing the upper surface of the valve body; a casing having a second through-hole and connecting the elastic member and the valve body to each other in one-piece construction by enveloping them therein; a valve tube having a closed lower end and an opened upper end to which said head is connected, and also having at the middle portion thereof an annular concave part with a valve hole drilled, the lower end thereof being inserted through the second through-hole of the casing and the first through-hole of the elastic member into the valve body and the elastic member being fitted into said annular concave part; and a spring energizing this valve tube upwards. A plastic casing is fitted onto the upper portion of said valve body. In addition, by providing the operating member with a grip trunk up- and downwards slidably fitted onto the container body, an easier operation is possible, and since the operating member is guided up- and downwards by the grip trunk, the operating member, and thus, the piston are more stably moved up- and downwards, and the longer up- and downward strokes of the piston are realized. Brief Description of the Drawings Figs. 1 to 3 illustrate Example 1 of the present invention; Fig. 1 is a half sectional front view, Fig. 2 is a half sectional view wherein the liquid sprayer is in an operated condition, Fig. 3 is an enlarged sectional view of the discharge valve portion, and Fig. 4 is an enlarged sectional view wherein the discharge valve is in an operated condition. Figs. 5 to 6 illustrate Example 2 of the present invention; Fig. 5 is a longitudinal sectional view of liquid sprayer, Fig. 6 is a longitudinal sectional view wherein liquid has been sucked into the cylinder. Figs. 7 to 9 illustrate Example 3; Fig. 7 is a half sectional front view of the operating member, Fig. 8 is a half sectional view of the discharge valve portion, and Fig. 9 is a view illustrating one variation of the piston portion. And Fig. 10 illustrates Example 4 and is a half sectional view of operating member. Preferred Embodiments of the Invention Referring now to the drawings, the preferred embodiments of the present invention will be described in the following: [Example 1] As illustrated in Figs. 1 to 4, an attaching trunk 12 is threaded on the neck portion 11 of the container body 1 forming a wide-mounted and long bottle, the upper end of a cylinder 2 is secured to this attaching trunk by fitting the former into the latter, and this cylinder 2 is hung from the neck portion into the container body 1. The cylinder 2 is provided with a suction valve 3 comprising a ball valve in the interior of the lower portion thereof, a suction pipe 4 hanging from the lower end thereof, and an air suction hole 13 on the exterior of the upper portion thereof introducing outside air into the container body 1 in order to prevent a negative pressure. This air suction hole 13 is covered with an elastic trunk-like portion 24 for preventing the leakage of liquid. A trunk-like operating member 5 is up- and downwards slidably provided on the upper portion of the container body 1 or the exterior of the attaching trunk 12, the upper end of a stem 6 is fitted into and engaged with the upper middle portion of this operating member located on the attaching trunk 12, and a spring 8 is provided in the interior of the cylinder 2, thereby energizing the trunk-like piston 7 and the stem 6 downwards. And in addition, a grip trunk 25 is hung, being fitted onto the container body 1 so as to envelop the upper half of the container body 1 from the periphery of the operating member 5 therein. In Figs. 1 and 2, 16 is a finger-hold concave part provided around the upper outer periphery of the operating member 5. A depressing spraying head 9 is depression-slidably attached to the upper end of the operating member 5, and in the interior of the upper portion of the operating member 5 is provided a discharge valve 10 being connected mechanically to the depressing spraying head 9 and communicating said head 9 with said stem together with the depression of said head 9, and further, in the interior of the upper portion of stem 6 is provided a spring 14 energizing the depressing spraying head 9 upwards simultaneously with the discharge valve 10 pushed up in a closed condition. In the figures, 15 is a spraying nozzle provided on the front side of the depressing spraying head 9. The spraying nozzle 15 is one of the type spraying liquid like mist. The discharge valve 10 has a bottomed valve tube 17 fitted into the lower end of the depressing spraying head 9. An annular concave part is provided on the side of the middle portion of this valve tube 17, and a valve hole 18 is drilled in this annular concave part. And a collar-like elastic body 19 having a first through-hole is located at the upper end of the stem 6, a casing 20 having a second through-hole is fitted onto the upper portion of the stem, and the elastic member 19 is secured thereto. The valve tube 17 is inserted through the second through-hole of the casing 20 and the first hole of the elastic member 19 into the stem 6, the elastic member 19 is fitted into the annular concave part the valve tube, and said valve hole 18 is sealed by means of the inner peripheral surface of the elastic body 19. In addition, the bottomed valve tube 17 is energized upwards by means of said spring, thereby maintaining the valve-sealing condition of the elastic member 19, and together with the lowered depressing spraying head 9, as illustrated in Fig. 4, the bottomed valve tube 17 is lowered, thereby opening the valve hole 18. In the illustrated example, the elastic member is deformed when the valve is opened, but an elastic member opening the valve by sliding may be also used. In this example, only by lifting up the operating member with respect to the container body 1 or by depressing the container body 1 with respect to the operating member 5, liquid can be pressurized by means of the spring 8, and thereafter this pressurized liquid can be sprayed in an atomized pattern only by depressing the depressing spraying head 9. A grip trunk 25 is hung from the operating member 5, and since grip trunk 25 is up- and downwards slidably fitted into the container body 1, the stem 6 having a trunk-like piston 7 and the operating member will not be loose with respect to the cylinder 2 when spraying liquid, even if the stroke of the trunk-like piston 7 with respect to the cylinder 2 becomes large, thereby realizing a smooth spraying. In addition, since the liquid sprayer in this example is constructed so as to raise the container body 1 with respect to the operating member 5, there are no problems of complicated spraying operations due to too large a stroke. And opposed to the sprayers using freon gas, this sprayer is friendly to the environment, is easy to operate, has a simple mechanism against the mechanical complication of the conventional accumulator sprayers, and is practically very useful and convenient. [Example 2] As illustrated in Figs. 5 to 6, Example 2 has essentially a similar arrangement as Example 1 except for partial design changes. The discharge valve 10 is different from Example 1 in that an independent aerosol-type valve is incorporated. And the elastic trunk-like portion 24 is also omitted. That is, the cylinder 2 is hung into the neck portion 11 and the upper portion of the cylinder 2 is secured to the neck portion 11 by means of the attaching trunk 12. At the upper portion of the stem whose lower end is inserted into the cylinder 2, an aerosol-type cylinder 10 is provided on, passing through the attaching trunk 12. Since this example is similar as Example 1 in other points, the description of the similar points are omitted with the same symbols being affixed. [Example 3] As illustrated in Figs. 7 and 8, Example 3 uses a different aerosol-type valve from that in Example 2. And in this example the stem 6 and the grip trunk 25 are constructed in one-piece by means of a connecting piece 30, thereby decreasing the number of the component parts. The aerosol-type valve is a engaging trunk the tip of which is inserted in an engaging hole provided in said connecting piece 30 and engaged therein. And this engaging trunk 31 is secured on the connecting piece 30. As for the aerosol-type valve used in this Example 3, a trunk-like valve body 23, the upper half of which being of larger diameter than the lower half, and an elastic member 19 with a first through-hole sealing the upper surface of the valve body 23 are enveloped in a plastic casing 20 having a second through-hole, and are connected to each other in one-piece construction. That is, the plastic casing 20 is constructed so as to erect a side wall portion 20b around a top plate portion 20a having the second through-hole in the middle and to provide a concave groove in the interior of the side wall portion 20b, and it is fitted into the trunk-like valve body 23 by fitting a convex groove provided on the upper outer periphery of the trunk-like valve body 23 into this concave groove. And a valve tube 17 with a closed lower end surface having an annular concave part valve hole 18 drilled at the middle portion thereof is inserted through the second through-hole of said plastic casing 20 and the first through-hole of said elastic member 19, the elastic member 19 is fitted into the annular concave part, said valve hole 18 is sealed by means of the inner wall surface of the through-hole of the elastic member 19, and the valve tube 17 is energized upwards by means of a spring 14 provided in the trunk-like valve body 23. Thus, a discharge valve is formed of the valve hole 18 and the elastic member 19. When a head 9 with a spraying aperture 15 is fitted into the upper end of the valve tube 17, and the head 9 is depressed against energization, the peripheral portion of the first through-hole of the elastic member 19 is bent downwards due to the lowered valve tube 17, thereby opening the valve hole 18, and when the valve tube 17 is raised due to the interruption of depression, the elastic member 19 is also elastically returned to the illustrated position, thereby sealing said valve hole 18. The valve in this Example uses a plastic casing, thus allowing the casing 20 to be fitted onto the valve body 23 much more easily than when a metallic casing is fixed by caulking. As illustrated in Fig. 10, by separating the main portion 7a of the piston from the trunk portion 7a, the main portion 7a of the piston may only be replaced with the trunk portion 7a remaining unreplaced, even if the cylinder 2 has a different diameter, which is very economical. [Example 4] In this example, as illustrated in Fig. 10, the aerosol-type valve of Example 3 is incorporated in the stem 6, wherein the trunk-like valve body 23 is constructed as a member forming a portion of the stem 6 in one-piece, the plastic casing 20 constructed together with an engaging trunk 31 in one-piece is fitted onto the stem 6, the plastic casing 20 is fitted onto the stem 6, the elastic member 9 with a first through-hole is provided at the upper portion of the stem 6, the valve tube 17 with a closed lower end surface having an annular concave portion with a valve hole 18 drilled is inserted through the second through-hole of said plastic casing 20 and the first through-hole of said elastic member 19, the elastic member 19 is fitted into the annular concave part, said valve hole is sealed by means of the inner wall surface of the through-hole of the elastic member 19, and the valve tube 17 is energized upwards by means of the spring 14 engaging a stepped part provided in the stem 6. Since said plastic casing 20 is constructed in one-piece with said engaging trunk 31 the tip of which is inserted into the engaging hole provided in said connecting piece 30 and is engaged therein, the number of component parts is decreased so much. In this arrangement, the number of component parts can be decreased, thus realizing an easier mass production and a decreased production cost. [Other Examples] Every component part of the above-described apparatus can be molded of plastic. According to the designs of spraying apertures, atomizers spraying liquid in an atomized pattern or sprayers spraying liquid in a straight-line can be provided. Industrial Applications The present invention is applicable for atomizing or spraying various liquids, for example, as atomizers for cosmetic liquids, sprayers for shampoo liquids, atomizers for insecticides, atomizers for liquid detergents, etc.

Claims: A liquid sprayer comprising a container body (1) having a neck portion (11): a cylinder (2) hanging from said neck portion (11) into the container body (1), a suction valve (3) provided at the lower end portion of this cylinder (2), a suction pipe (4) hanging from the lower portion of the cylinder (2), an operating member (5) up- and downwards movably located on the container body (1), a stem (6) hanging from this operating member (5) and being inserted into said cylinder (2), a trunk piston (7) provided at the lower end of the stem (6) and sliding together with the up- or downwards moving operating member (5) in the cylinder (2), a spring (8) provided in the cylinder (2) and energizing said trunk piston (7) and stem (6) downwards, a depressing spraying head (9) provided on the operating member (5), and a discharge valve (10) provided in the operating member (5), and communicating said stem (6) with the depressing spraying head (9) with said depressing spraying head (9) being depressed, wherein said discharge valve (10) is an aerosol-type valve having a valve tube (17) connected to the head (9) and having a valve hole (18), and the valve (10) is opened when the stem (6) and the piston (7) are depressed by depressing the head (9), characterized in that said aerosol-type valve (10) comprises: a valve body (6) having upper and lower ends being opened, an elastic member (19) having a first through-hole sealing the upper surface of the valve body, a casing (20) having a second through-hole and connecting the elastic member (19) and the valve body to each other in one-piece construction by surrounding them, said valve tube (17) having a closed lower end and an opened upper end to which said head (9) is connected, and also having at the middle portion thereof an annular concave part with said valve hole (18) drilled, the lower end thereof being inserted through the second through-hole of the casing (20) and the first through-hole of the elastic member (19) into the valve body and the elastic member (19) being fitted into said annular concave part, a spring (14) energizing this valve (10) upwards, and wherein said casing (20) is made of plastic and is fitted onto the upper portion of said valve body. The liquid sprayer of claim 1 wherein said valve body is constructed so as to form a portion of said stem in one-piece, the casing (20) is fitted onto the stem (6), the elastic member (19) with the through-hole (18) is attached to the upper portion of the stem, the valve tube (17) having the closed lower end surface with said valve hole (18) drilled is inserted through the second through-hole of said casing (20) and the first through-hole of said elastic member (19), the elastic member (19) being fitted into the annular concave part, said valve hole (18) is sealed by means of the inner wall surface of the through-hole of the elastic member (19), and said valve spring (14) is provided in the stem (6).

Inventors: MIZUSHIMA HIROSHI, SAITO TADAO, MIZUSHIMA, HIROSHI, SAITO, TADAO
Applicants: YOSHINO KOGYOSHO CO LTD, YOSHINO KOGYOSHO CO., LTD.
Application year: 1990
Main classification: B05B11
IPC codes: B05B9, B05B11