JP2000042457A - Dispenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a high pumping function over for a long period of time by equipping a synthetic resin-made coil spring provided so that an upper end is engaged with a stopper member provided on an under side of an attaching and detaching means of a piston in an installed state of the attaching and detaching means, and a lower end in an unloaded state exists on an upper side of an engaging plate provided to an under part of a cylinder. SOLUTION: A coil spring 24 comprising a spiral synthetic resin arranged coaxially between a cylinder 3 and a piston 6 is arranged on an under side of a disc-like packing (stopper) 20. The coil spring 24 is provided so that an upper end is fixed to a packing (stopper) 20 by a hook, in an unloaded state, that is, in a free state separated from an engaging plate 8 on an upper side of the engaging plate 8 provided to the lower part of the cylinder 3. Since the coil spring 24 in the unload state is held in a not-compressed state, the coil spring 24 is not deformed by stress relaxation, and a restoring force can be maintained for a long period of time irrespective of being made of resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dispenser, and more particularly, to a so-called dispenser which is attached to a container opening to push out a liquid in a container to the outside, and which sucks liquid in a cylinder by sliding a piston to discharge the liquid to the outside. The present invention relates to a manual dispenser having a pump function.

[0002]

2. Description of the Related Art In containers for shampoos, cosmetics and the like, a manual dispenser is often attached to the mouth in order to push out a predetermined amount of liquid inside. As a conventional dispenser, for example, Japanese Unexamined Patent Publication No.
A structure as disclosed in Japanese Patent Application Laid-Open No. 0-184977 is known. FIG. 6 and FIG.
1 shows a dispenser disclosed in Japanese Patent No. 4977.

[0003] This dispenser pushes out the liquid in the container to the outside by the following mechanism. That is, when the user pushes down the piston 32 via the head portion 31h, the volume of the variable pressure chamber 33h is reduced, and the coil spring 34h provided therein is compressed.
When 1h is released, the compressed coil spring 34h is restored and the piston 32 rises, and the variable pressure chamber 33
The pressure in the container h decreases, and the liquid in the container 35 enters the variable pressure chamber 33h from the inlet 36. Thereafter, when the user presses down the piston 32 again via the head portion 31h, the liquid that has entered the variable pressure chamber 33h is discharged to the outside from the ejection nozzle 37 through the flow path in the piston 32.

[0004] The conventional dispenser is housed so that the liquid is not released from the container when the dispenser is not used, so that the head is held down in a depressed state. FIG. 7 is disclosed in Japanese Unexamined Patent Publication No. 60-184977. The dispenser presses down the head portion 31h and compresses it against the restoring force of the coil spring 34h. By locking the locking projection 38 provided at a position close to the portion 31h to the locking portion 39, the head portion 31h is held in a depressed state. In the conventional dispenser, most parts are formed of synthetic resin because they are inexpensive and can be easily manufactured, but the coil spring is formed of metal because a high restoring force is required.

[0005]

However, since the conventional dispenser uses a metal coil spring, the coil spring is separated from other parts when it is discarded as garbage after use or when it is desired to recycle. And it is very troublesome. Further, since the liquid in the container constantly contacts the metal coil spring, for example, when the liquid in the container is a strongly acidic chemical or the like, the coil spring rusts, and the restoring force of the coil spring decreases due to the rust. Therefore, there is a problem that the pump does not work properly.

On the other hand, to solve this problem, it is conceivable that the coil spring is made of synthetic resin. However, in the conventional dispenser, the coil spring is held in a compressed state in a stored state when not in use. When used for a long time, the resin is deformed into a compressed state due to the stress relaxation behavior of the resin, and cannot be restored to its original state even when the storage state is released, so that a normal pump function cannot be performed. A dispenser that can function normally is disclosed in Japanese Patent Application Laid-Open No. 8-182946, but is proposed as still another method for solving the above problems. That is, the present invention solves the above problem, and has a normal pump function for a long period of time, and does not need to be separated for each component when discarded as garbage after use or when recycled. The purpose is to provide.

[0007]

The inventors of the present invention have studied the state of the dispenser when it is stored, the structure, the supporting state of the coil spring, the supporting position, the method of fixing and releasing the piston, and the like. They have found what can be done and have completed the present invention.

That is, according to the present invention, there is provided a cylinder having a liquid inlet with a check valve at a lower end thereof, the cylinder being attached to the mouth so as to hang from the mouth of the container, A cap to close the mouth of
A piston that penetrates through the cap, protrudes outward from the cap, and is freely inserted into the cylinder so as to be able to move up and down, a head integrally provided at an upper end of the piston and having a jet nozzle, and the head and the piston. A dispenser having a non-return valve with a check valve that penetrates and communicates the inside of the cylinder with the ejection nozzle, and pushes out the fluid in the container to the outside, wherein the dispenser is detachably mounted between the piston and the through portion of the cap. Attaching and detaching means provided so as to be freely provided, and coaxially disposed between the cylinder and the piston, and when the attaching and detaching means is in a mounted state, an upper end is engaged with a stopper member provided below the attaching and detaching means for the piston. And a coil spring made of synthetic resin provided so that a lower end in a no-load state is above a locking plate provided at a lower portion of the cylinder.

[0009] The attachment / detachment means according to the present invention is characterized in that a female screw is formed in the penetrating portion of the cap and a male screw is formed on the outer periphery of the piston and is screwed to the female screw.

[0010] The attachment / detachment means of the present invention is formed in a D-shaped through hole formed in a penetrating portion of the cap, and is formed in a radially flange-like shape separated from the stopper member of the piston by an amount corresponding to the thickness of the cap. It is a D-shaped engaging plate that passes through the through hole and is rotatable.

[0011] The attaching / detaching means of the present invention comprises:
It is a double-sided D-type engaging plate which is formed in a flange shape in the radial direction and is rotatable through the through-hole at a distance above the stopper member of the piston by the thickness of the cap. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The attaching / detaching means according to the present invention fixes a piston before use of a dispenser or when not in use, and does not apply a load such as compression or extension to a synthetic resin coil spring locked on the piston. What is necessary is just to be able to hold a free state or a no-load state.

[0013] More specifically, the attaching / detaching means of the present invention is characterized in that the upper part of the male screw formed on the outer periphery of the piston is pulled upward in the female screw formed in the hole of the penetrating portion of the cap so that the male screw becomes female. Although it is made detachable by screwing to a screw, it is not limited only to screwing.

The attachment / detachment means of the present invention may be a so-called D-shaped cut-through D-shaped through hole with a part of the cap penetrating portion, or a circular flange plate provided radially in the center of the piston. Alternatively, a D-shaped engaging plate radially provided on a piston may be radially spaced apart from a stopper member formed of an engaging rod by the thickness of the cap. The D-type engagement plate of the piston may be rotated after passing through the D-type through-hole, and the cap may be held by vertically holding the cap between the D-type engagement plate and the stopper member. The shape of the through-hole is not limited to the D-shape. It may be a double-sided D-type through hole with both sides cut axially symmetrically. At this time, the piston becomes a corresponding double-sided D-type engaging plate. The shape of the through-hole may be a wing shape or a polygonal shape as long as the cap can be held up and down.

Further, the attaching / detaching means of the present invention may have a fixing means at the time of mounting. As the fixing means, one or more projections are provided on both or either of the cap or the engagement plate, and the projection provided on the cap or the engagement plate when the engagement plate is rotated to the mounting position through the D-shaped through hole. It is preferable that a further recess is provided at a position opposite to, so that further rotation is suppressed and fixed.

The coil spring of the present invention is provided such that the upper end is engaged with the stopper member when the attaching / detaching means is mounted, and the lower end in the no-load state is above the locking plate. The phrase "exist" means that the lower end of the coil spring may be in contact with the upper side of the locking plate, or may be separated upward from the locking plate. What is necessary is just to be the state which does not apply a load to a coil spring.

The dispenser of the present invention is formed by a usual molding method such as injection molding using a usual synthetic resin. Further, since the dispenser is used by being attached to a container containing a liquid containing a chemical or the like, a chemical-resistant resin, for example, a polyacetal resin, a polyphenylene sulfide resin, a polybutylene terephthalate resin, or the like is preferable.

The dispenser of the present invention may be formed entirely of the same resin, or the type of synthetic resin may be changed according to the purpose and function of the component. Further, as the resin forming the coil spring, various synthetic resins can be used, among which polyacetal resin, polyphenylene sulfide resin, polybutylene terephthalate resin,
It is particularly preferable to use a synthetic resin having both strength and elasticity, such as a polyamide resin or a polypropylene resin.

[0019]

EXAMPLES The present invention will now be described specifically with reference to examples, but the present invention is not limited to these examples. FIG.
3 are diagrams showing Example 1 of the present invention. In FIG. 1, reference numeral 1 denotes a dispenser. The dispenser 1 includes a cylinder 3 attached to a mouth of the container 2 so as to hang down from the mouth 2a of the container 2 and a top end opening of the cylinder 3 and a mouth of the container. It has a cap 5 that closes 2 a and a piston 6 that penetrates the cap 5 and protrudes outward from the cap and is inserted into the cylinder 3 so as to be able to move up and down.

The cylinder 3 is formed in a cylindrical shape, the lower portion is continuously narrow and formed in an inverted conical shape, and an introduction pipe 7 extends at the lowermost portion. An annular locking plate 8 is provided on the inner wall at the lower part of the cylinder 3, and the center portion allows the piston 6 to pass therethrough and allows the liquid in the container to flow above the locking plate 8 without resistance. Is provided with a circular hole 9 larger in diameter than the piston 6.

A cylindrical introducing member 10 is provided below the cylinder 3.
Is inserted, and further, in the introduction path 11 of the introduction member,
A circumferential projection 12 is provided. A ball valve 13 which is a check valve using gravity is loosely fitted in a space formed by the circumferential projection 12 and the cylinder inner wall in the introduction path 11.

The piston 6 is formed in a hollow cylindrical shape, and a head 16 having an ejection nozzle 15 is provided at an upper end of the piston. The head 16 penetrates the head 16 and the piston 6 and the inside of the cylinder 3 and the ejection nozzle 15 are formed. And a flow path (not shown) that communicates with. At the lower end of the piston 6, a joint 18 having a smaller diameter than the diameter is provided. A jet nozzle 15 is provided in the liquid flow path inside the piston 6.
A check valve (not shown) having a function of blocking the intrusion of outside air from the container and allowing only the liquid in the container sucked from the joint portion 18 to pass therethrough is incorporated.

At approximately the center of the piston 6, a disk-shaped packing 20 sliding on the inner periphery of the cylinder 3 is provided, and the upper side of the cylinder is closed. A female screw formed in the penetrating portion of the cap 5, which is a detachable means provided between the outer periphery of the piston 6 in close contact with the packing and the penetrating portion of the cap 5 above the packing 20 so as to be detachable from each other. 2
1 and a male screw 22 formed on the outer periphery of the piston 6 and screwed to the female screw. The packing 20 is used to cap the piston 6 when the male screw 22 is screwed into the female screw 21.
It also serves as a stopper to adhere to the surface.

Below the packing 20, a coil spring 24 made of a spiral synthetic resin is disposed coaxially between the cylinder 3 and the piston 6. The upper end of the coil spring 24 is fixed to the packing 20 by a hook, and the lower end is provided above the locking plate 8 provided at the lower portion of the cylinder so as to be separated from the locking plate 8 in a no-load state, that is, in a free state. .

As described above, the dispenser 1 includes the cylinder 3, the piston 6, the cap 5, the introduction pipe 7, the locking plate 8, the introduction member 10, the ball valve 13, the head 16, the packing 20, the coil spring 24 and the like. However, all these parts are formed of polyacetal resin.
Since the coil spring 24 is formed in a spiral shape,
Despite being made of synthetic resin, it has high restoring force.

When the dispenser 1 is used, that is, when the liquid in the container 2 is pushed out, the head 16 is first pushed down in FIG. Next, when the force for pushing down the head 16 is released, the piston 6 pushed down together with the head 16 rises to a state before being pushed down by the restoring force of the coil spring 24 (FIG. 2).
As the piston 6 rises, the pressure in a space (hereinafter, referred to as a variable pressure chamber) 25 partitioned by the wall surface of the cylinder 2, the packing 20, and the ball valve 13 decreases as the volume increases. As a result, the ball valve 13 moves away from the valve seat 26, and the liquid in the container flows from the inlet 27 at the tip of the cylinder 3 to the variable pressure chamber 25.
Sucked inside.

Then, the head 16 is pushed down again,
When the piston 6 that has returned to the original position is lowered, the ball valve 1
3 is seated on the valve seat 26, the pressure in the transformation chamber 25 rises,
For this reason, the liquid filled in the variable pressure chamber 25 passes through the joint 18 at the tip of the piston 6, further passes through a check valve inside the piston, and is discharged to the outside from the ejection nozzle 15 of the head 16. FIG. 3 shows this state. As described above, the head 16 is intermittently pushed down and the piston 6 is repeatedly moved up and down, so that the dispenser 1 can intermittently push the liquid in the container to the outside.

After the dispenser 1 is manufactured, the container 2 is filled with the liquid and the dispenser 1 rotates counterclockwise while lifting the piston 6 together with the head 16 as shown in FIG. Then, the piston 6
Male screw 22 on packing 20 is female screw 21 of cap 5
, And rises until the packing 20 hits the lower surface of the cap 5 and stops. For this reason, the container 2 includes the cap 5 and the packing 20.
And the piston 6.

At this time, the upper end 24a of the coil spring is fixed to the lower side of the packing 20 by a hook, and the lower end 24b of the coil spring is separated from the upper side of the locking plate 8 below the cylinder. Coil spring 24
Is held in a non-loaded state and in a non-compressed state, so that the coil spring is not deformed due to stress relaxation, and can exhibit a restoring force for a long time despite being a resin. . In addition, since all parts are made of synthetic resin, that is, polyacetal resin, this dispenser 1 has
Or, in the case of recycling, there is no need to separate every component, and there is no bother.

Next, a second embodiment of the present invention will be described.
In the second embodiment, a D-type through hole and a D-type engaging plate are used instead of the attaching / detaching means using the female screw and the male screw in the first embodiment, and the other configurations are exactly the same. FIGS. 4A and 4B are diagrams showing a second embodiment. The cap 5 has a penetrating portion having a so-called D-shaped through hole 31 in which a part of a circular hole is cut. On the upper side, a D-shaped engaging plate 33 is formed, which is spaced apart by the thickness of the cap 5 in a radial direction and has a similar shape to the D-shaped through-hole, passes through the through-hole 31, and is rotatable.
Here, a projection 34 is provided in the vicinity of the linear edge 31b of the through hole 31 of the cap 5 so that a D
A recess 34a is provided on the lower surface of the mold engagement plate.

When the dispenser is not used, or
At the time of shipping or the like, the D-type engaging plate 33 is passed through the D-shaped through hole 31 while lifting the piston 6 together with the head 16 (not shown), and then the engaging plate 33 is rotated while rotating the head. The peripheral portion 33a of the engagement plate is engaged with the hole edge 31a of the through hole, and the projection 34 provided on the cap 5 is
It is fixed by engaging with a recess 34a provided in the mold engagement plate. In addition, an inclined surface may be provided at the periphery of the upper surface of the engagement plate 33 and the periphery of the lower surface of the through hole 31 so that the engagement plate 33 easily passes through the inside of the through hole 31. By this fixation, a coil spring (not shown) is in a no-load state as in the first embodiment, maintains a high restoring force during use, and has the same effect as the first embodiment.

FIG. 5 is a view showing another embodiment. In this embodiment, instead of a D-shaped through-hole and a D-shaped engaging plate, a so-called double-sided cut rectangular shape is formed by cutting both sides of a circular shape. Double-sided D-shaped through hole 41 and double-sided D similar to this
In this case, a mold engagement plate 43 is used. Further, two projections 44 and 45 are provided near the two linear edges 41 a of the through hole 41, and recesses 43 a and 43 b are provided at corresponding positions on the lower surface of the engagement plate 43. In this case, the same operation and effect as in the second embodiment can be obtained.

[0033]

As described above, according to the present invention,
In the housed state when not in use, the coil spring made of synthetic resin is held in a no-load state, and the coil spring is not deformed by stress relaxation, so that a high pump function can be exhibited for a long period of time. Further, since all the components of the dispenser of the present invention are formed of synthetic resin, there is no need to separate the components at all when disposing them as garbage after use, or when recycling them, eliminating troublesomeness. Can be.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a dispenser in a non-use state.

FIG. 2 is a partial sectional view showing a state of a dispenser at the start of use.

FIG. 3 is a partial cross-sectional view showing the dispenser in a state where a head is pushed down.

4A and 4B are diagrams showing another example of the attaching / detaching means, wherein FIG. 4A is a top view of the cap, and FIG.

5A and 5B are diagrams showing still another example of the attaching / detaching means, wherein FIG. 5A is a top view of the cap, and FIG.

FIG. 6 is a partial cross-sectional view showing a state where a head of a conventional dispenser is pushed up.

FIG. 7 is a partial cross-sectional view showing a state when a conventional dispenser is not used.

[Explanation of symbols]

 Reference Signs List 1 dispenser 2 container 3 cylinder 5 cap 6 piston 8 locking plate 15 ejection nozzle 16 head 20 packing (stopper) 21 female screw (detachment means) 22 male screw (detachment means) 24 coil spring 31 D-type through hole (detachment means) 33 D-type Engagement plate (detachment means) 41 Double-sided D-shaped through hole (detachment means) 43 Double-sided D-type engagement plate (detachment means)

Claims (4)

[Claims] 1. A cylinder having a liquid inlet with a check valve at a lower end thereof, the cylinder being attached to the mouth so as to hang down from the mouth of the container, and the mouth of the container covering an upper end opening of the cylinder. A cap that penetrates the cap, protrudes outward from the cap, and is inserted into the cylinder so as to be able to move up and down; a head integrally provided at an upper end of the piston and having a jet nozzle; A dispenser that has a check valve-equipped flow path that penetrates the head and the piston and communicates the inside of the cylinder and the ejection nozzle, and pushes out the fluid in the container to the outside; An attaching / detaching means provided so as to be mutually detachable between the cylinder and a piston, and an upper end of the piston is provided when the attaching / detaching means is mounted. A coil spring made of synthetic resin is provided so as to engage with a stopper member provided on the lower side of the attaching / detaching means and to have a lower end in a no-load state above a locking plate provided on a lower portion of the cylinder. Dispenser. 2. The dispenser according to claim 1, wherein the attachment / detachment means is a female screw formed in a penetrating portion of the cap and a male screw formed on an outer periphery of the piston and screwed to the female screw. 3. A detachable means is formed in a D-shaped through hole formed in a penetrating portion of the cap, and is formed in a flange shape in a radial direction at a distance above the stopper member of the piston by a thickness of the cap. The dispenser according to claim 1, wherein the dispenser is a D-shaped engagement plate that can pass and rotate. 4. A two-sided D-shaped through-hole in which both sides are cut into a D-shape in an axially symmetric manner in a penetrating portion of a cap, and a flange in a radial direction spaced apart from a stopper member of a piston by a thickness of the cap upward. The dispenser according to claim 1, wherein the dispenser is a double-sided D-shaped engagement plate formed in a shape and passing through the through hole and rotatable.