JPH057805A - Pump dispenser - Google Patents

Abstract

PURPOSE:To simplify metallic mold and to prevent liquid leakage by forming a negative pressure preventive hole in the side wall of a cylinder through a flange and forming two seal rings parted radially on both side of the negative pressure preventive hole atop the flange in such a manner that these rings can be pressed to the inside surface of a bottle cap. CONSTITUTION:The negative pressure preventive hole 32 is formed in the side wall of the cylinder 12 through the flange 21 and a pin PV for negative pressure preventive molding extends in the axial direction of a cylinder 22 from the flange 21 direction. Then, the tooling for the cylinder 12 can be constituted of a pair of dies D1, D2 to be slid in the axial line direction of the cylinder 12 and, therefore, the free tooling design is possible and can be simplified. The two seal rings 24, 25 parted from each other in the radial direction are formed atop the flange 21 on both sides of the negative pressure preventive hole 32 and the bottle cap 31 crimps the flange 21 between the cap and a mouth part 30 of the container and is screwed to the container 29. The seal rings 24, 25 are, therefore, pressed to the inside surface of the bottle cap 31 and the liquid leakage is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating motion of a piston which is attached to the mouth of a container and which is interlocked with the pushing of a nozzle head or a trigger, sucks and pressurizes the liquid in the container into a cylinder, and then pressurizes it. Pump dispenser for draining from.

[0002]

2. Description of the Related Art A pump dispenser that sucks and pressurizes a liquid in a container into a cylinder by a reciprocating motion of a piston and discharges the liquid is classified into a push button type and a trigger type. In the push type pump dispenser, the piston reciprocates in conjunction with the depression of the nozzle head (also called the push button), and in the trigger type pump dispenser, it interlocks with the depression (traction) of the trigger. The piston reciprocates.

In general, a pump dispenser is mounted on a container by screwing a bottle cap onto the male thread of the container mouth while holding the flange of the cylinder in the mouth of the container containing the liquid.

When the liquid in the container is sucked up by the cylinder, pressurized and flows out, the liquid level in the container is lowered. Therefore, it is necessary to prevent the negative pressure inside the container by allowing the outside air to flow into the container corresponding to the outflow of the liquid.

In the known pump dispenser, a negative pressure prevention hole (ventilation hole) is formed in the side wall of the cylinder, and when the skirt-shaped seal piece on the outer wall of the piston is pushed below the negative pressure prevention hole. A structure in which the inside of the container is communicated with the outside air is adopted (for example, JP-A-58-020259 and US Pat. No. 4,072,252).

According to the known pump dispenser having the above-described structure, at the initial position of the nozzle head and the trigger (which is of course also the initial position of the piston), the piston is located outside the negative pressure prevention hole. Since the seal piece is in close contact with the inner wall of the cylinder to block the communication between the outside air and the inside of the container, it is possible to prevent the liquid in the container from leaking through the negative pressure prevention hole.

Then, only when the skirt-shaped seal piece moves beyond the negative pressure prevention hole by pushing the nozzle head or oscillating the trigger so that the liquid flows out, the outside air, the container The inside communicates. Therefore, it is possible to reliably prevent the outside air from flowing into the container in response to the outflow of the liquid and to prevent the negative pressure in the container.

[0008]

The cylinder, like the nozzle head, trigger, piston, bottle cap and suction tube, is molded from plastic. However, due to the following design restrictions, the cylinder tends to be structurally more complicated than other members.

(1) A flange that is pressed against the mouth of the container and held by the bottle cap is integrally formed on the upper end of the cylinder. (2) A negative pressure prevention hole is provided on the side wall of the cylinder.

(3) In order to form an inflow path and to attach a suction tube, a cylinder is formed in a stepped shape having a small diameter at the lower end. (4) A compression spring that biases the piston outward is built into the cylinder, and the cylinder has a stepped shape to secure the spring seat of the compression spring.

(5) In order to secure the valve seat of the primary valve and limit the play of the primary valve in the lateral direction, the cylinder is stepped even at the position where the primary valve is arranged. (6) A steel ball is often used as the primary valve, and a protrusion is formed on the inner wall of the cylinder above the valve seat to prevent the steel ball from escaping upward.

As described above, since the cylinder has a stepped shape of 3 to 4 steps, the flange is formed on the upper end, the negative pressure preventing hole is formed on the side wall, and the escape preventing protrusion is formed near the lower end. , The cylinder is structurally considerably complicated.

Particularly, the negative pressure prevention hole is formed in the side wall of the cylinder, and the pin for forming the negative pressure prevention hole is located in the direction (side direction) intersecting with the axis of the cylinder. Therefore, FIG.
As shown in Figure 3, the mold for cylinder molding consists of a pair of dies D11 and D12 with negative pressure prevention hole molding pins Pv, a die D13 with core pin Pc for the hollow part of the cylinder, and a stepped part of the cylinder. It is a split mold divided into a molding die D14.

After being injected and cooled, the four-divided mold not only separates the dies D11 and D12 in a direction intersecting the axial direction of the cylinder, but also separates the dies D13 and D14 from the cylinder. It is necessary to pull out in the axial direction. As described above, in the structure in which the four dies are slid in the axial direction of the cylinder and in the direction intersecting with the axial line, the die becomes structurally complicated, and the movement at the time of molding becomes complicated.

Therefore, the die cost becomes expensive, and
Since the molding cycle becomes long and high productivity cannot be ensured, the cylinder, that is, the pump dispenser cannot be mass-produced at low cost.

An object of the present invention is to provide a pump dispenser which simplifies the mold of the cylinder structurally and enables mass production of the cylinder at low cost.

[0017]

In order to achieve this object, in the present invention, the negative pressure prevention hole is formed in the side wall of the cylinder by penetrating the flange of the cylinder. Then, for example, at least two seal rings that are separated from each other in the radial direction are formed on the upper surface of the flange across the negative pressure prevention hole.

[0018]

With this structure, it is possible to design the die so that the negative pressure prevention hole forming pin is extended in the axial direction of the cylinder, not in the direction intersecting the axial line of the cylinder.

[0019]

Embodiments of the present invention will now be described in detail with reference to the drawings.

As shown in FIG. 1, a pump dispenser 10 according to the present invention has a cylinder 12, a piston 14 slidably provided in the cylinder, and a beak shape fixed to the upper end of the piston. , Nozzle head 16, and the cylinder, piston, and nozzle head are all molded from plastic. Both the piston 14 and the nozzle head 16 are hollow, and the hollow portions 15 and 17 are liquid outflow passages.

Cylinder 12 is an upper half part with openings at the upper and lower ends.
18 and a lower half portion 20 having an upper end fitted to the upper half portion, which is divided and molded, and the upper half portion of the cylinder defines a pressurizing chamber-11 therein. A flange 21 is formed on the upper end of the cylinder upper half portion 18, and an annular stopper 22 is formed on the inner wall of the cylinder 12.

Return spring, for example compression coil spring
A cylinder 26 is built in the cylinder 12 and integrally pushes the piston 14 and the nozzle head 16 outward.

The pump dispenser 10 includes, for example, a flange 21 of a cylinder, a mouth portion 30 of a container 29, and a bottle cap.
While sandwiching between 31, the bottle cap is screwed onto the male thread at the mouth of the container and is detachably attached. Undercut
33 is formed on the upper end of the side wall of the bottle cap 31 to prevent the flange 21 from coming off during assembly.

With the outflow of liquid from the container, the container
In order to prevent the inside of 29 from becoming negative pressure, a negative pressure prevention hole (ventilation hole) 32 penetrates the flange 21 and the upper half of the cylinder.
Two pieces are provided on the side wall of 18, for example, 180 ° apart from each other.

The piston 14 is integrally provided with a skirt-shaped seal piece 34 slidably contacting the inner wall of the cylinder upper half portion 18, and this seal piece serves as a spring seat above the return spring 26. Has become. When the skirt-shaped seal piece 34 comes into contact with the stopper 22 of the cylinder from below, the initial position (outward position) of the piston 14, that is, the nozzle head 16 is limited. See
The rule piece 34 is located at the initial position of the nozzle head 16 and below the negative pressure prevention hole 32 of the cylinder.

Other than the seal piece 34 of the piston, for example, a step portion is provided on the outer wall of the piston above the seal piece 34, and this step portion is brought into contact with the stopper 22 of the cylinder so that the nozzle head 16 is The initial position may be defined.

As can be seen from FIGS. 2 and 3 in addition to FIG. 1, a seal ring 23 is formed on the lower surface of the stopper 22 of the cylinder, and another seal ring 24 is formed on the radius of the negative pressure prevention hole 32. It is formed on the upper surface of the flange 21 inward in the direction. Here, the seal ring 23 is on the upper surface of the seal piece 34 of the piston,
The seal rings 24 are formed so as to be pressed against the lower surface of the bottle cap 31, respectively.

Further, the seal ring 25 is provided with a negative pressure prevention hole 32.
It is formed on the upper surface of the flange 21 of the cylinder radially outward of and is pressed against the inner surface of the bottle cap 31. Also,
The seal ring 27 is pressed against the mouth 30 of the container,
It is formed on the lower surface of the flange 21.

In the present invention, the negative pressure prevention hole 32 is
It is formed on the side wall of the cylinder 12 penetrating 21. Therefore, the pin Pv for forming the negative pressure prevention hole should be flanged in the axial direction of the cylinder, not in the direction intersecting the axial line of the cylinder 22.
It is extended from 21 directions (see Fig. 4 (A) and (B)). Note that FIG. 4B is an enlarged view of the portion B in FIG. 4A.

Therefore, as shown in FIGS. 4 (A) and 4 (B), the mold of the cylinder can be composed of a pair of dies D1 and D2 which are slid in the axial direction of the cylinder. The number of dies is reduced from 4 to 2. Further, in the known configuration, the mold is slid in two directions, that is, the axial direction of the cylinder and the direction intersecting with the axial line, whereas in the present invention, it is only necessary to slide the mold in one direction.

Therefore, the mold design can be freely performed without structural restrictions, and the mold can be structurally simplified. The molding cycle of the cylinder 12 is shortened, high productivity can be secured, and the cylinder 12, that is, the pump dispenser 10 can be mass-produced at low cost.

Nozzle head 16 is not pushed in, piston
If 14 stays in its initial position, the piston is the return spring.
It is pressed against the seal ring 23 on the lower surface of the stopper by the biasing force of 26. Further, since the bottle cap 31 is screwed to the container 29 with the flange 21 sandwiched between the bottle cap 31 and the container mouth portion 30, the seal rings 24 and 25 that sandwich the negative pressure prevention hole 32 are not attached to the bottle cap 31.
It is pressed against the inner surface of 31.

The liquid in the container tries to leak through the negative pressure prevention hole 32. However, as mentioned above, the seal rings 23, 24
Is pressed to ensure liquid tightness, so that the seal rings 23 and 24 hinder the flow inward in the radial direction through the negative pressure prevention hole 32. Further, since the seal ring 25 ensures liquid tightness, the flow outward in the radial direction is prevented by the seal ring 25.
Hindered by.

As described above, by providing the seal rings 23, 24, 25, the leakage of the liquid through the negative pressure prevention hole 32 can be sufficiently prevented. Here, since the seal rings 23, 24, 25 extend in the axial direction of the cylinder 12, there is no problem in molding, and complication of the mold for cylinder molding is avoided,
High productivity can be secured.

Instead of the seal rings 24, 25, an O-ring or the like may be arranged between the flange 21 and the bottle cap 31. However, in the structure in which the seal rings 24 and 25 are formed on the flange 21 as shown in the drawing, the liquid leakage can be easily prevented with a simple structure that does not cause a problem in molding without causing an increase in the number of parts. At least two seal rings 24 and 25 with the negative pressure prevention hole 32 in between are sufficient. However, a plurality of negative pressure preventing holes 32 may be provided inward and outward in the radial direction.

In the known construction, the gasket is sandwiched between the mouth and the flange of the container to ensure liquid tightness.

On the other hand, in the present invention, since the seal ring 27 on the lower surface of the flange is pressed against the mouth portion 30 of the container to ensure liquid tightness, the liquid in the container is kept in the mouth portion of the container and the bottle cap. It does not leak after 31. Therefore, it is not necessary to dispose the gasket between the mouth portion 30 and the flange 21 of the container, and the number of parts can be reduced. In addition, this seal ring
Since 27 also extends in the axial direction of the cylinder 12, the die of the cylinder is not complicated.

In the embodiment, the seal rings 23, 24, 25, 27 are formed in a substantially triangular cross section. However, the seal ring need only have a shape that ensures liquid tightness, and is not limited to the substantially triangular cross section shown in the figure.

An annular protrusion 35 is formed on the outer wall of the piston 14. When the nozzle head 16 is pushed in to lock the nozzle head together with the piston 14, the protrusion 35 is provided at a position where it slides into contact with the stopper 22 of the cylinder.
Then, the projection 35 of the piston is brought into sliding contact with the stopper 22 of the cylinder to ensure liquid tightness, thereby preventing the liquid from leaking when the nozzle head 16 is locked.

In the embodiment, the annular slit 22a is formed on the upper surface of the stopper 22 to give elasticity to the stopper. Under the elasticity of the slits 22a, the protrusions 35 come into close contact with the stoppers 22 and the leakage of the liquid is reliably prevented. The slit 22a need only be elastic,
The shape, arrangement, etc. are not limited to those illustrated.

As shown in FIG. 5, the stopper 122 is hung from the lower surface of the bottle cap 31, and the lower end of the stopper is seated.
The ring 23 may be formed. Also in this configuration, it is possible to reliably prevent the liquid from leaking through the negative pressure prevention hole 32. Further, the seal ring 24 on the upper surface of the flange is unnecessary. Since the stopper 122 hangs from the lower surface of the bottle cap 31, it becomes relatively long and the stopper
The resilience to adhere to 122 is also obtained in this configuration.

As shown in FIG. 1, the male screw 36 is attached to the piston 14
The piston 14 has a small diameter below the male thread. When the piston 14 is locked together with the nozzle head 16, the seal means 38 for shutting off the communication between the suction tube, the pressure chamber 11 of the cylinder through the primary valve, and the inside of the container is located below the female screw. Is provided between the lower cylinder part 20 and the piston.

In the embodiment, the seal means 38 is embodied as a seal piece formed on the small diameter portion of the lower end of the piston. Also, a plurality of, for example, four vertical grooves 39 are provided on the seal piece.
It is formed on the piston 14 above 38 and communicates with the pressure chamber 11 of the cylinder and the outflow passage 15 of the piston.

The lower cylinder half portion 20 is formed so that it can be mounted inside the upper cylinder half portion 18 with a gap left between them. An annular fitting protrusion 40 extends from the center of the lower cylinder half portion 20 to the lower end portion thereof. Is formed on the outer wall of. The cylinder 12 is assembled while the fitting protrusion 40 of the lower half portion of the cylinder is fitted to the inner wall of the upper half portion 18 of the cylinder.

The upper end of the lower cylinder half 20 is open, and the lower cylinder half has a stepped shape with a small diameter at the lower end, and a suction tube 44 is attached to the lower end of the lower cylinder half. The inside of the lower half portion 20 of the cylinder also has a stepped hole shape, and in the embodiment, it is formed into a stepped hole shape of three steps that decreases from top to bottom. The female thread 45 to be attached is
Is formed in.

A valve seat 47 for the primary valve 46 is provided in the bore of the lower cylinder half 20 below the internal thread 45. In the embodiment, a plastic valve with a guide rod is used as the primary valve 46, and the annular projection 48 on the inner wall of the lower cylinder half 20 prevents the primary valve from escaping upwards.

At the locking position of the piston 14 and the nozzle head 16, the seal piece 38 at the lower end of the piston is slidably in contact with the inner wall 20a of the lower cylinder half 20 above the valve seat 47.
Is provided.

A return spring 26 is arranged above the female screw 45 and between the hole in the lower half portion 20 of the cylinder and the seal piece 34 of the piston. Further, an annular groove 49 is formed at the lower end of the lower cylinder half 20 to ensure uniform cooling of the plastic lower cylinder half 20.

In order to generate elasticity in the female screw 45 in the lower half of the cylinder, one slit 50 is formed in the lower half 20 of the cylinder from the upper end to the female screw (see FIG. 1). Therefore, when the piston 14 is pushed into the cylinder 12, the male screw 36 at the lower end of the piston is fitted into the female screw 45 of the lower half of the cylinder while pushing and expanding the upper end of the lower half 20 of the cylinder.

In this way, the slit 50 is provided and the female screw 45 is provided.
Cylinder 12, piston 14
The male thread 36 of the piston can be fitted and screwed into the female thread 45 of the cylinder without applying relative rotational movement therebetween. Therefore, the assembling of the piston 14 into the cylinder 12 can be easily automated.

The upper half of the cylinder 18 and the lower half of the cylinder
Needless to say, the gap of 20 is of a size that does not impair the expansion of the lower half of the cylinder due to the presence of the slit 50. Further, in the embodiment, the slit 50 is one, but two or more slits may be provided.

A valve seat 52 is provided in the outflow passage 15 in the piston, and a secondary valve 54 is built in the piston 14. Secondary valve 54
Is composed of a known valve assembly in which a valve body 54a, a wave spring 54b, and a pressing plate 54c are integrally molded, and the protrusion 55 at the upper end of the outflow passage 15 of the piston prevents the secondary valve 54 from escaping.

The pressing rod 56 extends from the inner surface of the nozzle head 16 into the outflow passage 15 of the piston and presses the pressing plate 54c of the secondary valve 54 to bring the valve body 54a into close contact with the valve seat 52. The tip of the outflow passage 17 of the nozzle head is an outlet 58.

The pump dispenser 10 having the above structure is assembled in several steps as follows.

(1) First, the inner element built in the cylinder 12, that is, the secondary valve 54, the piston 14, and the retarder.
The spring 26 and the primary valve 46 are incorporated into the lower half portion 20 of the cylinder and integrated in advance. Secondary valve 54, piston for integration
14, the return spring 26, the primary valve 46, the cylinder lower half 20
They are arranged in series in this order.

Then, a pushing force is applied so that the secondary valve 54 is housed in the piston 14, the return spring 26 and the primary valve 46 are housed in the lower cylinder half 20, respectively. Push it into 20. Then, due to the existence of the slit 50, the male screw 36 at the lower end of the piston is
While expanding the upper end of 20, push the female screw 45 on the lower half of the cylinder.
And is screwed on without rotational movement.

When the male screw 36 and the female screw 45 are screwed together, the upper end of the lower half portion 20 of the cylinder returns to its original shape to firmly grip the piston 14, and the secondary valve 54, the piston 14, the return spring 26 The primary valve 46 and the lower cylinder half 20 are integrated.

For convenience of description, the inner element (the secondary valve 54, the piston 14, the return spring 26, the primary valve 46) assembled in the lower cylinder half 20 and integrated is called an inner assembly. I will.

(2) Then, the nozzle head 16, the bottle cap 31, the cylinder upper half portion 18, the inner assembly, and the suction tube 44 are arranged in series.

Then, the nozzle head 16 is pushed in from above and the suction tube 44 is pushed in from below into the inner assembly with the bottle cap 31 and the cylinder upper half 18 interposed.

Then, the upper cylinder half portion 18 is assembled into the lower cylinder half portion 20 of the inner assembly from above,
The upper half of the cylinder and the lower half of the cylinder are integrated, and the nozzle head 16 is fitted and fixed to the upper end of the piston 14 of the inner assembly with the bottle cap 31 interposed. At the same time, the suction tube 44 is fitted and fixed to the lower end of the cylinder lower half portion 20 of the inner assembly. Then, the pump dispenser 10 is assembled.

In this way, the piston 14 and the lower half of the cylinder
Just by applying pushing force between 20
Is screwed to the female screw 46 in the lower half of the cylinder, and the rotational movement of the piston and nozzle head 16, which is an obstacle to the automatic assembly of the pump dispenser 10, is unnecessary in the present invention. Therefore, automatic assembly of the pump dispenser 10 can be easily performed and productivity is improved.

The above-mentioned assembly of the pump dispenser 10 is an example, and the pump dispenser 10 is assembled in the order other than the above.
May be assembled.

The bottle cap 31 is screwed onto the mouth 30 of the container 29 filled with the liquid, and the pump dispenser 10 is mounted on the container, packed, transported, and exhibited. Here, the screwing of the bottle cap 31 to the container mouth 30 requires a rotational movement, but a large number of dedicated machines have been developed and provided for screwing the bottle cap 31 to the container mouth 30. As a result, the bottle cap can be screwed on without any problems.

The pump dispenser 10 is assembled by locking the piston 14 and the nozzle head 16 in the pushing position,
It is attached to the container 29. Therefore, unexpected pushing of the nozzle head 16 due to carelessness in transportation, exhibition, falling, etc. is prevented, and leakage of liquid is prevented. Further, since the nozzle head 16 is pushed in, the pump dispenser 10 is downsized, can be packed in a small size, and the display space is small, so that the pump dispenser 10 can be efficiently transported and displayed.

In the known pump dispenser of this type, when the nozzle head is locked, the lower end of the piston forcibly presses the primary valve against the valve seat to close the primary valve, thereby interposing the primary valve. The outside air and the communication inside the container are shut off. However, with this configuration, it is necessary to reduce the assembly error and molding error of the related components such as the piston, the cylinder, the valve seat, and the primary valve, and the components must be molded with high quality.

On the other hand, in the present invention, the piston 1
4, when the nozzle head 16 is locked, the seal piece 38
The (sealing means) slidably contacts the inner wall 20a of the lower half of the cylinder to shut off the communication between the outside air and the inside of the container through the primary valve.

With this structure, a wide sliding contact range is ensured, so that an assembly error and a molding error of related components can be set to be relatively large. In addition, the related components are only two members, the cylinder 12 and the piston 14. Therefore, it is not necessary to mold the constituent members (cylinder 12, piston 14) with high quality, the productivity is improved, and the pump dispenser 10 can be manufactured at low cost.

Bottle cap for container 29, as described above
The screwing of 31 presses the seal rings 24, 25 of the cylinder against the inner surface of the bottle cap 31 to ensure liquid tightness.
Further, when the piston 14 and the nozzle head 16 are locked, the protrusion 35 of the piston is pressed against the stopper 22 of the cylinder to ensure liquid tightness. Therefore, even if the liquid in the container reaches the negative pressure prevention hole 32, it is blocked by the seal rings 24 and 25 and the projection 35 and does not leak.

When the bottle cap 31 is screwed into the container 29, the seal ring 27 on the lower surface of the cylinder is pressed against the mouth 30 of the container to ensure liquid tightness. Liquid leakage can be prevented without a gasket.

A series of cylinder seal rings 23, 24, 25, 2
Since 7 is formed in a direction parallel to the axis of the cylinder 12, the mold of the cylinder is not structurally complicated. Even if the cylinder 12 has a molding error in the axial direction and an assembly error, the molding error and the assembly error can be corrected to some extent by changing the screwing state of the bottle cap 31 to the container 29. Therefore, the tolerance of the cylinder 12 is not so small, and the cylinder can be easily molded from this point as well.
Can be mass-produced at low cost.

In the known construction, the flange, the negative pressure prevention hole,
Since the valve seat of the primary valve and the projection for preventing the escape of the primary valve are formed in the cylinder of an integral body, the cylinder has a stepped shape of 3 to 4 steps, and the structural complexity of the cylinder cannot be avoided.

On the other hand, in the present invention, the cylinder 12
Is divided into an upper half portion 18 and a lower half portion 20, and the lower half portion is fitted into the upper half portion to assemble the cylinder. In this configuration, the flange 21 and the negative pressure prevention hole 32 are provided in the cylinder upper half portion 18, the primary valve valve seat 47, and the primary valve escape prevention projection 48 are provided in the cylinder lower half portion 20. It is distributed and arranged in the upper half and the lower half.

Therefore, the upper half portion 18 of the cylinder can be formed in a simple structure without a step portion, and the die can be structurally simplified.
Further, the lower cylinder half portion 20 is structurally simplified as compared with the case where a single-piece cylinder is molded from one mold. Therefore, with two molds, the upper half 18 and the lower half of the cylinder
Considering the disadvantages of individually molding and assembling the 20 pieces, the die cost can be reduced and the cylinders 12 can be mass-produced at low cost.

If the piston 14 and the lower cylinder half 20 are screwed together and the piston 14 and the nozzle head 16 are unlocked, the biasing force of the return spring (compression spring) 26 causes the nozzle head 16 to move to the piston. Pushed outward with 14. Then, at the initial position (outward position) where the skirt-shaped seal piece 34 of the piston contacts the stopper 22 of the cylinder, the piston
14, the nozzle head 16 moves.

It goes without saying that the pump operation for outflowing the liquid is similar to the known operation. In other words, the male thread 36 at the lower end of the piston does not fit into the female thread 45 at the lower half of the cylinder, and the nozzle head is inserted between the pushing position and the initial position.
When the piston 14 is pushed in and the piston 14 is reciprocated in the cylinder 12, the liquid in the container is suction tube 44 and primary valve 46.
Through the pressure chamber 11 of the cylinder and is pressurized. Then, the pressurized liquid is the vertical groove 39, the secondary valve 54, the outflow passage 15,
It flows out of the outlet 58 via 17.

Although the nozzle head 16 is formed in a beak shape, nozzle heads of various other shapes can be adopted. In addition, a spinner (swirlization member) is provided in the outflow passage 17 of the nozzle head.
May be provided, and the spray flow vortexed by the spinner may be discharged.

In the embodiment, the present invention is embodied as a push type pump dispenser, but the present invention is not limited to this and is a trigger type pump dispenser.
May be embodied as

The above-described embodiments are intended to explain the present invention, and are not intended to limit the present invention in any way. The present invention includes all modifications and alterations within the technical scope of the present invention. It goes without saying that it will be done.

[0080]

As described above, according to the present invention, since the negative pressure prevention hole is formed in the side wall of the cylinder by penetrating the flange, the metal of the cylinder is removed from the pair of dies which are slid in the axial direction of the cylinder. The mold is configurable. Therefore, the mold design can be freely performed without structural restriction, and the mold can be structurally simplified. Therefore, the molding cycle can be shortened and high productivity can be secured, and the cylinder, that is, the pump dispenser can be manufactured at low cost.

If at least two seal rings that are separated from each other in the radial direction across the negative pressure prevention hole are formed on the upper surface of the flange and pressed against the inner surface of the bottle cap, the flange upper side through the negative pressure prevention hole is formed. It is possible to easily prevent the liquid from leaking out.

Also, in the structure in which the seal ring pressed against the piston is formed on the stopper of the cylinder, it is possible to easily prevent the liquid from leaking between the piston and the cylinder at the initial position of the piston.

A stopper pressed by the piston may be formed on the lower surface of the bottle cap, and a seal ring may be provided at the lower end of the stopper. In this structure, the seal ring 24 radially inward of the negative pressure prevention hole is provided. It can be omitted.

By hanging the seal ring pressed against the mouth of the container from the lower surface of the flange of the cylinder, the liquid tightness between the container and the cylinder can be secured without disposing the gasket between the mouth and the flange of the container. The number of parts can be reduced.

If the male thread is formed on the lower end of the piston and the female thread to which the male thread of the piston is screwed at the piston locking position is formed on the cylinder, and the slit is provided on the cylinder to make the female thread elastic, Simply pushing the piston into the cylinder locks the piston, facilitating automatic assembly of the pump dispenser and improving productivity.

If the cylinder is divided into an upper half portion and a lower half portion and molded, the upper half portion of the cylinder has a simple structure without steps, and the die is structurally simplified. Also, the lower half of the cylinder is structurally simplified. Therefore, even considering the disadvantage of individually molding and assembling the upper half part and the lower half part of the cylinder with the two molds, the mold cost can be reduced overall, and the cylinder can be manufactured at low cost.

Since the cylinder is divided into the upper half portion and the lower half portion of a simple structure and is molded, the cylinder can be molded with a small molding error as compared with the molding of the cylinder of the integral body. Also,
Since the cylinder is assembled by fitting the upper half portion and the lower half portion of the cylinder, a large assembly error does not occur. Therefore, the cylinder can be produced with high productivity. Furthermore, since it is not screwed, the assembly of the cylinder can be automated.

Since the upper half part and the lower half part of the cylinder are also divided, the slit and the female screw can be formed in the lower half part of the cylinder without difficulty in forming.

A male screw for locking the nozzle head and the piston at the pushing position is provided at the lower end of the piston and hidden inside the cylinder, so that an aesthetic appearance is obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a pump dispenser according to an embodiment of the present invention.

FIG. 2 is an enlarged vertical cross-sectional view of a partially broken pump dispenser.

FIG. 3 is an enlarged plan view of a flange of a cylinder.

FIG. 4 is a schematic vertical cross-sectional view of a cylinder molding die.

FIG. 5 is an enlarged vertical cross-sectional view of a partially broken pump dispenser according to another embodiment.

FIG. 6 is a schematic vertical cross-sectional view of a cylinder molding die in a known pump dispenser.

[Explanation of symbols]

10 Pump dispenser 12 cylinders 14 piston 16 nozzle head 18 Upper half of cylinder (upper half of cylinder) Lower half of cylinder 20 (lower half of cylinder) 21 Cylinder flange 22,122 Stopper 23 Stopper seal ring 24,25 Seal ring on top of flange 26 Return spring (compression coil spring) 27 Seal ring under the flange 29 containers 30 container mouth 31 bottle cap 32 Negative pressure prevention hole 34 Piston skirted seal piece 36 Male thread at the bottom of the piston 38 Seal Means 40 Mating protrusion 44 Suction tube 45 Cylinder male thread 46 Primary valve 54 Secondary valve 58 Outlet D1, D2, D11, D12, D13, D14 Cylinder molding die Pv Negative pressure prevention hole forming pin Pc core pin

Claims (5)

[Claims] 1. A cylinder is mounted on a container by sandwiching a flange of the cylinder with a bottle cap at the mouth of the container containing the liquid to be discharged, and the liquid inside the container is transferred to the cylinder by the reciprocating movement of the piston. When the piston is sucked up, pressurized and discharged, and the piston is pushed against the biasing force of the return spring, a negative pressure prevention hole that communicates the inside of the container with the outside air penetrates the flange of the cylinder to the side wall of the cylinder. A pump dispenser in which at least two seal rings are formed and are separated from each other in the radial direction, and are formed on the upper surface of the flange so as to sandwich the negative pressure prevention hole so as to be pressed against the inner surface of the bottle cap. 2. The cylinder is mounted on the container by sandwiching the flange of the cylinder with the bottle cap at the mouth of the container containing the liquid to be discharged, and the liquid inside the container is transferred to the cylinder by the reciprocating movement of the piston. When the piston is sucked up, pressurized and discharged, and the piston is pushed against the biasing force of the return spring, a negative pressure prevention hole that communicates the inside of the container with the outside air penetrates the flange of the cylinder to the side wall of the cylinder. Formed, the seal ring can be pressed against the inner surface of the bottle cap,
A pump dispenser in which a stopper formed on the upper surface of the flange radially outward of the negative pressure prevention hole and having a seal ring at the lower end capable of pressing the piston is formed integrally with the bottle cap and hangs down. 3. The pump dispenser according to claim 1, wherein the seal ring is formed on the lower surface of the flange of the cylinder so as to be pressed against the upper surface of the mouth portion of the container. 4. A cylinder having a suction tube attached to a lower end thereof is attached to the mouth of the container by sandwiching the flange of the cylinder between the mouth of the container and the bottle cap, and the piston is biased to the return spring. By sliding in the cylinder against the force, the liquid in the container is sucked up by the cylinder through the suction tube, pressurized and discharged, and the piston is locked in the push-in position for transportation and display. In the pump dispenser, a negative pressure prevention hole is formed in the side wall of the cylinder by penetrating the flange of the cylinder, and at least two seal rings radially separated from each other are provided on the upper surface of the flange across the negative pressure prevention hole. Male thread is formed on the lower end of the piston, and the female thread to which the male thread of the piston is screwed at the piston locking position is formed on the cylinder and A pump dispenser in which at least one slit is formed in the cylinder. 5. A lower half of a cylinder having an upper half that opens up and down and extends through the upper end of the piston; an open upper end that can be fitted in the upper half and a lower end to which a suction tube is attached. The pump dispenser according to claim 4, wherein the pump dispenser is formed by being divided into two parts, and the slit and the female screw are provided at the upper end of the lower half part of the cylinder.