Metered injection mechanism and aerosol product equipped with this metered injection mechanism

Abstract

To provide a constant volume injection mechanism having a constant volume chamber between the stem of an aerosol container using compressed gas and an external space region, reliably prevented from after-draw of leakage of a content from an injection port after injection.SOLUTION: In a constant volume injection mechanism, a cylindrical part 9c engaged with the outer periphery of an upward projection 13a is provided at intermediate valves (9b, 9c, 13a) between an upstream pressurizing chamber A and a downstream constant volume chamber B formed by partitioning the inside of a tank 8 by a piston 11, to thereby prevent an open state immediately after releasing the pressing-down operation of an operation button 5. A shaft 14 of downstream valves (14a, 14b, 14c, 16) between the constant volume chamber B and an external space region is immediately made to be a closed state by reduction of passing flow force by return forces of a shaft spring 15 and a shaft gasket 16, and the closed state is secured by a step part 14c. Thus, the downstream valves are set in a closed state in advance by content movement for next injection from the pressurizing chamber A to the constant volume chamber B, to prevent leakage of the content from the injection port of a nozzle tip 6.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a metering injection mechanism for aerosol-type products using compressed gas.

[0002] Particularly, a metering chamber for injecting the content is formed between the stem side member of the aerosol container and the operation side member that moves relative thereto, and the piston provided in this metering chamber is driven by the content flowing in by the action of the compressed gas inside the container to reduce its volume (metering chamber volume), so that the content stored in the metering chamber at the end of the previous metering injection stage is injected into the external space area. The present invention relates to a metering injection mechanism.

[0003] That is, a metering chamber is formed between the stem output portion and the operation portion, and it is an aerosol-type product using compressed gas. When the operation portion is actuated, for example, when it is pressed down in the same manner as when setting the operation mode, the content in the metering chamber is injected into the external space area. It is a metering injection mechanism in such a mode.

[0004] And at the stage where the piston moves to its final position (for example, the uppermost position) and finishes the original continuous injection of the content, the metering chamber region and the content passage region on the injection port side are closed, and a function (after-drip prevention function) of preventing "after-drip" in which the content leaks into the external space area when not performing the injection operation is provided. The present invention is directed to a metering injection mechanism.

[0005] In this specification, for the sake of convenience of explanation, the longitudinal direction of the stem, that is, the vertical direction in each figure, is referred to as "up" or "down", and the direction in which the content is injected into the external space area, that is, the left direction in each figure, is referred to as "front".

Background Art

[0006] The applicant of the present application has already proposed a metering injection mechanism of a type that forms a metering chamber between the stem output portion and the operation portion (see Patent Document 1). Among them, a metering injection mechanism having an after-drip prevention function is also disclosed (see FIGS. 6 and 7 of Patent Document 1).

[0007] The alphanumeric characters enclosed in brackets [ ] used in the following description indicate reference numerals in Patent Document 1.

[0008] In the after-draw prevention function of this quantitative injection mechanism, the valve action of the valve member

[15] and the hole [13b] that is opened and closed by it isolates the quantitative chamber [A'] from the outside space when the injection operation is not in progress, thereby preventing leakage of the contents.

[0009] This valve action works as follows: the pressure of the contents flowing from the container into the pressurizing chamber [B'] due to the injection operation causes the piston

[14] to move upward, which compresses the metering chamber [A']. The pressure of the contents contained therein causes the valve member

[15] to move upward, opening up to allow flow into the hole [13b].

[0010] Furthermore, during the relative movement between the push button [4] and the top plate-like member

[12] just before the device returns from the spraying operation and transitions to the stationary mode, the valve member

[15] moves downward relative to the hole [13b], resulting in an "open state" where the contents cannot flow into the hole [13b]. [Prior art documents] [Patent Documents]

[0011] [Patent Document 1] Japanese Patent Publication No. 2007-326647 [Overview of the Initiative] [Problems that the invention aims to solve]

[0012] Furthermore, the valve for preventing after-draw closes just before transitioning to stationary mode due to the recovery operation after the injection operation is released. As a result, during the recovery operation, the contents moving from the pressurizing chamber [B'] to the metering chamber [A'] may leak into the external space through the valve (hole [13b]) which is still open.

[0013] Furthermore, the restriction of the movement of contents from the pressurizing chamber [B'] to the metering chamber [A'] is due to a closing action caused by the contact between the valve action part [13c] and the upper opening of the inner upper cylindrical part [11b]. Therefore, if the button-side base

[13] and the stem-side base

[11] move even slightly relative to each other from the contact state, the closure is released, and there is no time to move the valve member

[15] to close the hole [13b] before the release.

[0014] The present invention aims to ensure the prevention of afterdraw by closing the downstream valve, which closes the passage to the injection nozzle to prevent afterdraw, before the contents to be injected next move when returning from an injection operation. [Means for solving the problem]

[0015] The present invention solves the above problems as follows. (1) An aerosol container using compressed gas (for example, aerosol container 1 described later) is provided with a stem for operating an upstream valve (for example, stem 3 described later) and a stem holder (for example, stem holder 13 described later) through which the contents to be sprayed pass, A tank (for example, tank 8 described later) is attached to the outer circumference of the stem holder in a liquid-tight, slidable manner in the direction of the stem's discharge movement, and whose interior communicates with the cylindrical end via an upstream passage of the stem holder. An operating unit (for example, the operating button 5 described later) that moves the tank by the user's operation, The interior of the tank is divided into an upstream pressurizing chamber (for example, the upstream storage area A described later) and a downstream metering chamber (for example, the downstream storage area B described later), and is provided to be liquid-tight and slidably mounted, with a piston (for example, the piston 11 described later) biased toward the pressurizing chamber, In a quantitative injection mechanism comprising, The tank is closed when it comes into substantially contact with the stem holder in the direction of the stem's discharge movement, and an intermediate valve (for example, the annular step portion 9b, cylindrical portion 9c, and upward protrusion 13a described later) blocks communication between the pressurizing chamber and the metering chamber. And, The tank is provided on the side of the metering chamber, and when the intermediate valve transitions from the closed state to the open state, it connects the metering chamber to the outside space, and is equipped with a downstream valve (for example, the upper lateral hole 14a, lower lateral hole 14b, stepped portion 14c, and shaft gasket 16 described later) that transitions from the closed state to the open state when the intermediate valve transitions to the closed state, Use one with a specific configuration. (2) In (1) above, When the control unit is operated from stationary mode to spray mode, The tank moves relative to the stem holder in the direction of the stem's discharge, and the intermediate valve closes. The communication between the pressurizing chamber and the quantitative chamber is blocked. The downstream valve opens, connecting the quantitative chamber to the external space. The tank comes into contact with the stem holder, and the stem, which is integrated with it, moves in the discharge direction, causing the upstream valve to open. The contents of the aerosol container flow into the pressurizing chamber through the passage of the stem holder, causing the piston to move towards the metering chamber. As a result, the contents contained in the quantitative chamber, whose volume is reduced, are injected into the external space through the downstream valve. When the volume of the quantitative chamber reaches its minimum and the injection of the contents ends, and the operating unit is then operated from the injection mode to the stationary mode, The aforementioned stem moves in the opposite direction to the discharge movement, causing the upstream valve to close. When the tank moves relative to the stem holder in the opposite direction to the discharge movement of the stem and the contact is released, the downstream valve becomes closed. Furthermore, the tank moves and the intermediate valve opens. The pressurized chamber and the quantitative chamber are in communication, and the contents of the pressurized chamber move into the quantitative chamber. Use one with a specific configuration. (3) In the above (1) and (2), The aforementioned intermediate valve is An intermediate valve body (for example, an upward-facing protrusion 13a described later) provided on the stem holder, consisting of a tapered surface and a cylindrical surface continuing from its outer circumference, An intermediate valve seat provided on the tank side, having an annular step portion (for example, the annular step portion 9b described later) where the tapered surface abuts on the inner circumference and a cylindrical hanging portion (for example, the cylindrical portion 9c described later) that is slidable and liquid-tightly fitted on the outer peripheral surface of the cylindrical surface. A configuration mode is used. (4) In the above (1) to (3), The valve body of the downstream valve (for example, the shaft 14 described later) Can abut on the stem holder and is biased to that side. A configuration mode is used. (5) In the above (1) to (4), The valve seat of the downstream valve Consists of an annular gasket provided on the tank side (for example, the shaft gasket 16 described later). The valve body of the downstream valve (for example, the shaft 14 described later) Is held on the inner peripheral surface of the annular gasket, and has a downstream valve annular step portion (for example, the step portion 14c described later) that abuts on the plane on the outflow side of the content of the annular gasket, a downstream valve tapered surface (for example, the shaft tapered surface 14d described later) that abuts on the opposite side of the plane on the outflow side of the content, and a communication hole portion (for example, the upper horizontal hole 14a described later) provided in the annular recess between the downstream valve annular step portion and the downstream valve tapered surface and closed by the inner peripheral surface. A configuration mode is used.

[0016] The quantitative injection mechanism having such a configuration and an aerosol product using compressed gas provided with the quantitative injection mechanism are the objects of the present invention.

Effects of the Invention

[0017] By adopting the above configuration, the present invention can ensure prevention of after-draw.

Brief Description of the Drawings

[0018] [Figure 1] It is an explanatory diagram showing the stationary mode of the quantitative injection mechanism. [Figure 2]Figure 1 is an explanatory diagram showing the injection modes of the quantitative injection mechanism. [Figure 3] Figure 1 is an explanatory diagram showing the upstream valve closing mode of the quantitative injection mechanism. [Figure 4] Figure 1 is an explanatory diagram showing the downstream valve closure mode of the quantitative injection mechanism. [Figure 5] Figure 1 is an explanatory diagram showing the intermediate valve opening mode of the quantitative injection mechanism. [Modes for carrying out the invention]

[0019] The embodiments for carrying out the present invention will be explained with reference to Figures 1 to 5.

[0020] In addition, the following alphabetical reference symbols (e.g., cylindrical hanging part 5a) generally indicate that they are part of the numerical component of the reference symbol (e.g., operation button 5).

[0021] Here, in Figures 1 to 5, 1 is an aerosol container containing the contents to be sprayed and compressed gas to be pressurized and released from stem 3, described later. 2 is a mounting cup that is attached to the upper opening of aerosol container 1 together with a gasket. 3 is provided in such a manner that it penetrates the central opening of the mounting cup 2, and is a cylindrical stem (upstream valve) that releases the contents of the aerosol container 1 from the upper end hole when pressed. 4 is a cylindrical shoulder cover that engages with and is fixed to the outer surface of the mounting cup 2, and whose inner surface has vertical rib-like parts that guide the operation button 5 (described later) in the vertical direction. 5 has an operating button on its top surface that is pressed down by the user, and houses the tank 8 described later inside at the bottom. 5a is formed on the lower surface of the operation button 5, its outer circumference fits into the upper inner surface of the inner cylindrical part of the tank body 9 described later, and its interior is a cylindrical hanging part that communicates with the back of the nozzle tip 6 described later. 6 is a cap-shaped nozzle tip provided on the side of the operation button 5, which sprays the contents that have passed through the inside of the cylindrical hanging part 5a into the external space through the central hole at the front. 7 is a cylindrical core disposed inside the nozzle tip 6, with a bypass channel for the contents set on its outer circumference. 8 engages with the lower interior of the operation button 5, and the tank consists of the tank body 9 and the tank lid 10, which will be described later. 9 consists of an annular top plate and an outer cylindrical part and an inner cylindrical part hanging down from its inner and outer circumference, forming the upper part of the tank body. 9a is formed on the upper side of the inner cylindrical part of the tank body 9, and is a lateral hole that connects the inside and outside of the inner cylindrical part. 9b is provided at the lower end of the inner cylindrical part of the tank body 9 and is an annular stepped portion (intermediate valve) that serves as the valve seat of the needle valve. 9c is a cylindrical part (intermediate valve) that hangs down from the outer circumference of the annular stepped portion 9b. 10 is an annular tank lid that fits onto the lower end of the outer cylindrical part of the tank body 9. 11 is an annular piston that slides up and down in a sealed state between the outer cylindrical part and the inner cylindrical part of the tank body 9. 12 is a piston spring provided between the annular top plate of the tank body 9 and the piston 11, which biases the piston 11 downward. 13 is a stem holder, which is a stem-side member that engages with the central cylindrical part of the tank lid 10 in a sealed state so as to be able to slide up and down, and whose lower end fits into the stem. 13a is provided on the upper side of the stem holder 13 and consists of a horizontal top surface, an upward tapered surface and an outer peripheral surface, and an upward convex portion (intermediate valve) that becomes the valve body of the needle valve. 13b is an upstream communication hole that connects the stem 3 and the outer circumferential surface of the upward projection 13a. 14 is a sheath-shaped shaft housed in the inner cylindrical part of the tank body 9 through a lower opening. 14a is provided in a manner that connects the inside and outside of shaft 14, and is an upper lateral hole (downstream valve) through which the contents are injected from the top of the tank to the outside space when in injection mode. 14b is provided in a manner that connects the inside and outside of shaft 14, and is a lower lateral hole through which the contents moving up and down the tank when the intermediate valve is open during the return operation and the contents being injected from the upper side of the tank into the external space when the injection mode is activated pass. 14c is provided on the upper outer peripheral surface of the upper lateral hole 14a and is a downward-facing stepped portion that contacts the shaft gasket 16 described later when not in injection mode. 14d is an upward-facing shaft tapered surface provided between the upper lateral hole 14a and the lower lateral hole 14b. 15 is housed inside the cylindrical hanging part 5a and is provided between the operating button 5 and the upper end of the shaft 14, and is a shaft spring that biases the shaft 14 downward. 16 is sandwiched between the operating button 5 and the upper tank 8 on its outer circumference, and an annular shaft gasket (downstream valve) through which the shaft 14 passes in the central hole. A is the area inside the tank 8 below the piston 11, and is an upstream storage area (pressurized chamber) that accommodates the contents flowing in from the stem 3 during the injection mode and biases the piston 11 upward. B is the area above the piston 11 inside the tank 8, and is the downstream storage area (metering chamber) that stores contents from the upstream storage area A when the intermediate valve is open during the return operation. These are shown respectively.

[0022] Here, the stem 3, shoulder cover 4, operating button 5, nozzle tip 6, core 7, tank 8 (tank body 9 + tank lid 10), piston 11, stem holder 13, and shaft 14 are made of plastic, such as polypropylene, polyethylene, polyacetal, nylon, or polybutylene terephthalate.

[0023] Furthermore, the aerosol container 1, piston spring 12, and shaft spring 15 are made of, for example, plastic or metal, the mounting cup 2 is made of, for example, metal, and the shaft gasket 16 is made of, for example, elastomer or rubber.

[0024] Furthermore, the lower center of the mounting cup 2 is provided with a stem gasket that, together with the stem 3, constitutes the upstream valve, a stem spring that biases the stem 3 upward and holds the upstream valve in a closed position, and a housing that holds these together with the lower end of the stem 3 (not shown).

[0025] Furthermore, the force exerted by the shaft spring 15 to return to the stationary mode is set to be sufficiently weaker than the force exerted by the stem 3 to return to the closed state.

[0026] Figure 1 shows the stationary mode when operation button 5 is not pressed.

[0027] At this time, the stem 3 (upstream valve) is in a closed position, positioned upwards, and the downstream valve is in a closed position with the shaft 14 lowered and the upper lateral hole 14a closed by the shaft gasket 16.

[0028] Then, the piston 11 is at its lowest position, the volume of the upstream storage area A is minimized, and the downstream storage area B contains the contents from the previous operation.

[0029] Furthermore, if the container is unused and air is contained in the downstream storage area B, a single injection operation will release the air into the external space and contain the contents from the container.

[0030] Figure 2 shows the state of the contents being sprayed (spray mode) after pressing the operation button 5 from the state shown in Figure 1.

[0031] When the operation button 5 is pressed down from the stationary mode shown in Figure 1, the lower end of the shaft 14 comes into contact with the stem holder 13, and then the operation button 5 and the tank 8 integrated with it move downward, opening the upper lateral hole 14a. Then, the upper end tapered surface of the upward-facing protrusion 13a and the inner circumference of the annular step portion 9b come into contact, causing the intermediate valve to close. Upon contact, the stem holder 13 moves downward together with the stem 3, the operating button 5, and the tank 8, causing the stem 3 (upstream valve) to open and the contents of the container to flow upward from the cylindrical interior of the stem 3.

[0032] The contents from stem 3 flow into the upstream storage area A via stem holder 13, and the resulting pressure pushes piston 11 upward against piston spring 12.

[0033] As the piston 11 pushes up, the downstream containment area B shrinks, and the contents contained therein are ejected into the external space by sequentially passing through the lateral hole 9a, the lower lateral hole 14b, the internal passage of the shaft 14, the upper lateral hole 14a, the gap between the nozzle tip 6 and the core 7, and the injection port in the center of the front of the nozzle tip 6.

[0034] Since the intermediate valve is in a state where the inner circumference of the annular step portion 9b and the tapered surface of the upward convex portion 13a are in strong contact, it can block the strong pressure of the contents released from the stem 3.

[0035] The piston 11 moves upward until it contacts the upper end of the tank 8, and when the volume of the downstream storage area B is at its minimum, the injection of the contents ends (metered injection).

[0036] Furthermore, the pressure of the contents attempting to flow out from below the shaft gasket 16 may cause the shaft 14 to move upward and separate from the stem holder 13.

[0037] Figure 3 shows the upstream valve closing mode, which is the initial stage of the recovery operation after releasing the operation button 5 from the state where the spraying of the contents has finished.

[0038] When the pressure on the operation button 5 is gradually released, the operation button 5, tank 8, piston 11, stem holder 13, and shaft 14 move upward together with the stem 3, causing the stem 3 (upstream valve) to close.

[0039] Figure 4 shows the downstream valve closing mode, which is the intermediate stage of the recovery operation after releasing the pressure on the operation button 5 from the state shown in Figure 3.

[0040] When the downward pressure is released, the operation button 5 and the tank 8 move upward relative to the stem 3, the stem holder 13, and the shaft 14 that contacts them.

[0041] This is because the contents of the upstream storage area A, which are pressurized by the piston 11 biased by the piston spring 12, push down the stem holder 13 relative to the tank lid 10, and the restoring force of the shaft spring 15 and shaft gasket 16 pushes down the shaft 14 that is in contact with the stem holder 13.

[0042] At this time, the shaft gasket 16 pushes down the shaft 14 due to the force of returning to its flat state and the contraction force of the central hole which has been widened by the shaft tapered surface 14d.

[0043] Furthermore, since the shaft spring 15 also biases the shaft 14 downward, the shaft 14 moves relative to the shaft gasket 16 without delay, the inner circumferential surface of the shaft gasket 16 fits into the annular recess created between the stepped portion 14c and the shaft tapered surface 14d, and the upper lateral hole 14a is securely closed.

[0044] In this way, the stepped portion 14c is positioned in close contact with the upper surface of the shaft gasket 16, thereby increasing the area in which the inner circumferential surface of the shaft gasket 16 closes the upper transverse hole 14a without displacement and in close contact, thereby reliably preventing the passage of contents.

[0045] Although the lateral hole portion 9a is spaced apart from the tapered surface of the upward projection portion 13a, the cylindrical portion 9c remains in a liquid-tight fit with the outer surface of the upward projection portion 13a, and the intermediate valve remains closed.

[0046] At this time, the upstream valve by stem 3 is in the closed state, so the intermediate valve is not subjected to the strong pressure of the contents from the container, and is only subjected to the weak pressure generated by the biasing force of piston spring 12 on the contents of the upstream containment area A when piston 11 is moved.

[0047] Furthermore, since the intermediate valve only resists this weak pressure during the mid-stage of the return operation and is not permanent, the inward and outward fitting of the circumferential surfaces of the inner surface of the cylindrical portion 9c and the outer surface of the upward projection 13a is sufficient to ensure a closed state.

[0048] In this way, the closed state of the intermediate valve can be set not only to a state in which the lateral hole portion 9a and the tapered surface of the upward projection portion 13a that constitute the needle valve are in contact, but also to a state in which they are slightly separated (almost in contact).

[0049] This prevents after-draw by keeping the intermediate valve closed until the upper transverse hole 14a (downstream valve), which connects the downstream storage area B and the external space, is securely closed, thereby blocking the contents from flowing from the upstream storage area A to the downstream storage area B.

[0050] Figure 5 shows the intermediate valve open mode, which is the final stage of the recovery operation after releasing the operation button 5 from the state shown in Figure 4.

[0051] When the operation of pressing down the operation button 5 is released from the state shown in Figure 4, the operation button 5, tank 8, and shaft 14 move upward relative to the stem 3 and stem holder 13, and the upper lateral hole 14a is securely closed.

[0052] At this time, the cylindrical portion 9c separates from the outer surface of the upward projection 13a and the intermediate valve opens, so the upstream storage area A and the downstream storage area B are in communication, and the contents of the upstream storage area A are pushed out by the piston 11 which moves downward due to the restoring force of the piston spring 12, and flow into the downstream storage area B by passing through the intermediate valve, the lower lateral hole 14b, and the lateral hole portion 9a in order.

[0053] Then, when the piston 11 contacts the tank lid 10 and the upstream storage area A reaches its minimum volume, it transitions to the stationary mode shown in Figure 1.

[0054] The contents of downstream containment area B that flowed in at this time will be sprayed in the next operation.

[0055] Of course, the present invention is not limited to the embodiments described above. (11) The operation button 5 and the tank body 9 are integrated. (12) The inner cylindrical part of the tank body 9 is provided on the tank lid 10 side. (13) The stem holder 13 is made larger in diameter, and the tank lid 10 is omitted. (14) The piston 11 and the piston spring 12 are integrally molded. (15) The shaft 14 and the shaft spring 15 are integrally molded. (16) The tank lid 10 and the stem holder 13 are integrally molded via a diaphragm. You may do so.

[0056] Aerosol products to which the present invention is applied include a wide range of products such as detergents, cleaning agents, coolants, muscle anti-inflammatory agents, hair growth agents, hair dyes, hair styling agents, hair treatments, sunscreens, lotions, cleansing agents, antiperspirants, cosmetics, shaving foams, food products, liquid droplets (such as vitamins), pharmaceuticals, quasi-drugs, horticultural agents, insecticides, pest repellents, animal repellents, deodorants, laundry starch, fire extinguishers, paints, adhesives, lubricants, and urethane foams.

[0057] The contents of aerosol containers can be in various forms, such as liquid, cream, or gel. The components included in the contents may include powders, oils, alcohols, surfactants, polymer compounds, active ingredients specific to each application, and water.

[0058] Powdered materials include metal salt powders, inorganic powders, and resin powders. For example, talc, kaolin, aluminum hydroxychloride (aluminum salt), calcium alginate, gold powder, silver powder, mica, carbonate, magnesium chloride, silica, zinc oxide, titanium dioxide, zeolite, nylon powder, barium sulfate, cellulose, and mixtures thereof are used.

[0059] The oil components used include silicone oils such as dimethylpolysiloxane, ester oils such as isopropyl myristate, oils and fats such as palm oil, eucalyptus oil, camellia oil, olive oil, and jojoba oil, hydrocarbon oils such as liquid paraffin, and fatty acids such as myristic acid, palmitic acid, stearic acid, linoleic acid, and linolenic acid.

[0060] Examples of alcohols used include monohydric lower alcohols such as ethanol, monohydric higher alcohols such as lauryl alcohol and cetanol, and polyhydric alcohols such as ethylene glycol, 1,3-butylene glycol, and glycerin.

[0061] As surfactants, anionic surfactants such as sodium lauryl sulfate, nonionic surfactants such as polyoxyethylene alkyl ethers and polyglycerin fatty acid esters, amphoteric surfactants such as lauryldimethylaminoacetic acid betaine, and cationic surfactants such as alkyltrimethylammonium chloride are used.

[0062] Examples of polymer compounds used include hydroxyethylcellulose, methylcellulose, gelatin, starch, casein, xanthan gum, and carboxyvinyl polymer.

[0063] Depending on the application, the active ingredients used may include dyes such as paraphenylenediamine and aminophenol, oxidizing agents such as hydrogen peroxide, setting agents such as acrylic resins and waxes, UV absorbers such as 2-ethylhexyl paramethoxycinnamate, vitamins such as retinol and dl-α-tocopherol, moisturizers such as hyaluronic acid, anti-inflammatory and analgesic agents such as methyl salicylate and indomethacin, disinfectants such as sodium benzoate and cresol, insect repellents such as pyrethroids and diethyltoluamide, antiperspirants such as zinc paraphenolsulfonate, cooling agents such as camphor and menthol, anti-asthma drugs such as ephedrine and adrenaline, sweeteners such as sucralose and aspartame, adhesives and paints such as epoxy resins and urethane, dyes such as paraphenylenediamine and aminophenol, oxidizing agents such as hydrogen peroxide, and fire extinguishing agents such as ammonium dihydrogen phosphate and sodium / potassium bicarbonate.

[0064] Furthermore, other substances besides those listed above, such as suspending agents, emulsifiers, antioxidants, and metal ion chelating agents, can also be used.

[0065] For aerosol products, compressed gases such as carbon dioxide, nitrogen, compressed air, nitrous oxide, oxygen, noble gases, and mixtures thereof are used as the gas for propelling the contents. [Explanation of Symbols]

[0066] 1: Aerosol container 2: Mounting Cup 3: Stem (upstream valve) 4: Shoulder cover 5: Operation buttons 5a: Cylindrical hanging part 6: Nozzle tip 7: Middle child 8: Tank 9: Tank body 9a: Lateral hole 9b: Annular stepped section (intermediate valve) 9c: Cylindrical part (intermediate valve) 10: Tank lid 11: Piston 12: Piston spring 13: Stem holder 13a: Upward-facing protrusion (intermediate valve) 13b: Upstream communication hole 14: Shaft 14a: Upper transverse hole (downstream valve) 14b: Lower side hole 14c: Step section (downstream valve) 14d: Shaft tapered surface (downstream valve) 15: Shaft spring 16: Shaft gasket (downstream valve) A: Upstream containment area (pressurized chamber) B: Downstream containment area (determination chamber)

Claims

1. A quantitative spray mechanism fitted to the stem of an aerosol container comprising an upstream valve including a stem and a stem gasket, wherein the upstream valve is activated to spray the contents, A stem holder that fits onto the aforementioned stem and through which the contents to be sprayed pass, A tank is provided on the outer circumference of the stem holder, which is liquid-tight and slidably engaged in the direction of the stem's discharge movement, and whose interior communicates with the cylindrical interior of the stem via an upstream passage of the stem holder. An operating unit that moves the tank by the user's operation, The interior of the tank is divided into an upstream pressurizing chamber and a downstream metering chamber, and is provided with a liquid-tight, slidable piston that is biased toward the pressurizing chamber. In a quantitative injection mechanism comprising, The tank is brought into substantially contact with the stem holder in the direction of the stem's discharge movement, thereby closing the intermediate valve that blocks communication between the pressurizing chamber and the metering chamber. And, The tank is provided with a downstream valve located on the metering chamber side, which transitions from a closed state to an open state when the intermediate valve transitions to a closed state, thereby connecting the metering chamber to the external space, and which transitions to a closed state at least by reducing the flow force passing through it. A quantitative injection mechanism characterized by the following features.

2. When the control unit is operated from stationary mode to spray mode, The tank moves relative to the stem holder in the direction of the stem's discharge, and the intermediate valve closes. The communication between the pressurizing chamber and the quantitative chamber is blocked. The downstream valve opens, connecting the quantitative chamber to the external space. The tank comes into contact with the stem holder, and the stem, which is integrated with it, moves in the discharge direction, causing the upstream valve to open. The contents of the aerosol container flow into the pressurizing chamber through the passage of the stem holder, causing the piston to move towards the metering chamber. As a result, the contents contained in the quantitative chamber, whose volume is reduced, are injected into the external space through the downstream valve. When the volume of the quantitative chamber reaches its minimum and the injection of the contents ends, and the operating unit is then operated from the injection mode to the stationary mode, The aforementioned stem moves in the opposite direction to the discharge movement, causing the upstream valve to close. When the tank moves relative to the stem holder in the opposite direction to the discharge movement of the stem and the contact is released, the downstream valve becomes closed. Furthermore, the tank moves and the intermediate valve opens. The pressurized chamber and the quantitative chamber are in communication, and the contents of the pressurized chamber move into the quantitative chamber. The quantitative injection mechanism according to claim 1, characterized in that it is a feature of the present invention.

3. The aforementioned intermediate valve is An intermediate valve body provided in the stem holder, consisting of a tapered surface and a cylindrical surface continuing from its outer circumference, The intermediate valve seat provided on the tank side has an annular step portion that abuts against the inner circumference of the tapered surface and a cylindrical hanging portion that is slidable and liquid-tightly fitted to the outer circumference of the cylindrical surface, A quantitative injection mechanism according to claim 1 or 2, characterized in that it is characterized by the present invention.

4. The valve body of the downstream valve is It is capable of contacting the aforementioned stem holder and is biased toward that side. A quantitative injection mechanism according to any one of claims 1 to 3.

5. The valve seat of the downstream valve is It consists of an annular gasket provided on the tank side, The valve body of the downstream valve is The downstream valve comprises an annular stepped portion held on the inner circumferential surface of the annular gasket and in contact with the content discharge side plane of the annular gasket, a downstream valve tapered surface in contact with the opposite side of the content discharge side plane, and a communication hole provided in the annular recess between the downstream valve annular stepped portion and the downstream valve tapered surface and closed by the inner circumferential surface, A quantitative injection mechanism according to any one of claims 1 to 4.

6. A metering injection mechanism according to any one of claims 1 to 5, and containing a compressed gas for injection and contents, An aerosol product characterized by the following features.

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