JP2020083327A - Discharger - Google Patents

Abstract

To reduce push-down force to a push-down head required for discharging contents from a discharge hole.SOLUTION: A piston guide 17 is fitted in a stem 11, protrudes downward from the stem, and penetrates the inside of a piston 14 vertically. A lower end part 13 of the piston guide is formed in a topped cylindrical. A coil spring 19 includes an upper end spring part 19a inserted in the lower end part of the piston guide, and a main body spring part 19b that extends downward from the upper end spring part and has an outer diameter and an inner diameter larger than those of the upper end spring part. An upper end opening edge of the main body spring part and a lower end opening edge of the piston guide abut, and an upper end opening edge of the upper end spring part is not contact with an inner surface of the lower end part of the piston guide.SELECTED DRAWING: Figure 1

Description

The present invention relates to a dispenser.

Conventionally, for example, as shown in Patent Document 1 below, a mounting cap that is mounted on the mouth of a container body, and a pump having a stem that is pierced through the mounting cap so as to be movable downward in an upwardly biased state, The pump is equipped with a push-down head that is attached to the upper end of the stem and has a discharge hole for discharging the contents.The pump has a cylindrical piston that is linked to the vertical movement of the stem, and the piston can slide up and down. A cylinder that is fitted to the stem, a piston guide that fits inside the stem, projects downward from the stem, and penetrates the inside of the piston in the vertical direction; a lower valve body that opens and closes the lower end opening of the cylinder; And a coil spring for urging the piston guide upward is known.

JP, 2005-182801, A

However, in the above-described conventional ejector, there is room for improvement in reducing the pressing force applied to the pressing head when ejecting the content from the ejection hole.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an ejector capable of reducing the pressing force applied to the pressing head when ejecting contents from the ejection holes. ..

In order to solve the above problems and achieve such an object, the dispenser of the present invention is capable of moving downward with a mounting cap mounted on the mouth of the container body and with the mounting cap being biased upward. A pump having a stem penetrating through, and a push-down head mounted on the upper end of the stem and having a discharge hole for discharging contents, wherein the pump is configured to move the stem vertically. A cylindrical piston that is linked, a cylinder in which the piston is vertically slidably fitted, a piston guide that fits in the stem, projects downward from the stem, and vertically penetrates the inside of the piston; A lower valve body that opens and closes a lower end opening of the cylinder; and a coil spring that is disposed in the cylinder and biases the piston guide upward, and the lower valve body is arranged inside the cylinder. A valve main body that is provided with an accommodating cylinder part provided, wherein the lower valve body is arranged inside the accommodating part and a fitting part that is fitted in the accommodating cylinder part, and that opens and closes a lower end opening of the cylinder. And a connecting piece that is elastically deformable and that connects the valve body and the inner peripheral surface of the fitting portion, wherein the lower end portion of the piston guide has a top end cylindrical shape. The upper end spring portion inserted into the lower end portion of the piston guide, and the main body spring portion extending downward from the upper end spring portion and having a larger outer diameter and inner diameter than the upper end spring portion. The upper end opening edge of the main body spring portion and the lower end opening edge of the piston guide contact each other, and the upper end opening edge of the upper end spring portion is not in contact with the inner surface of the lower end portion of the piston guide. ing.

According to this invention, the coil spring includes a main body spring portion that extends downward from the upper end spring portion that is inserted into the lower end portion of the piston guide, and that has a larger outer diameter and inner diameter than the upper end spring portion. Since the upper end opening edge of the piston guide and the lower end opening edge of the piston guide are in contact with each other, when the push head is pressed to move the stem and the piston guide downward, the main body whose outer diameter and inner diameter are larger than the upper end spring portion. A vertical compressive force is applied to the spring portion. Therefore, compared with the case where a vertical compression force is applied to a coil spring having an outer diameter and an inner diameter equal to those of the upper end spring portion, it is possible to suppress the generated upward biasing force to be low, and the content is discharged from the discharge hole. It is possible to reduce the pressing force applied to the pressing head when performing.
Since the upper end spring portion of the coil spring having the smaller inner diameter and outer diameter is inserted into the lower end portion of the piston guide, the coil spring can be easily assembled and the settability can be improved.

Here, the outer peripheral surface of the upper end spring portion may be in contact with or close to the inner peripheral surface of the lower end portion of the piston guide.

In this case, since the outer peripheral surface of the upper end spring portion is in contact with or close to the inner peripheral surface of the lower end portion of the piston guide, it is possible to suppress the coil spring from wobbling in the radial direction with respect to the piston guide. ..

According to the present invention, it is possible to reduce the pressing force applied to the pressing head when discharging the content from the discharge hole.

It is a longitudinal cross-sectional view of a discharger shown as one embodiment according to the present invention, and is a view showing a state in which a push-down head is located at a descending end position. It is a longitudinal cross-sectional view of the ejector shown as one embodiment according to the present invention, and is a view showing a state in which the push-down head is located at the rising end position.

Hereinafter, a dispenser 1 according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1 and FIG. 2, the dispenser 1 of the present embodiment is configured so that the mounting cap 21 mounted on the opening W2 of the container body W and the mounting cap 21 can be moved downward while being biased upward. A pump 24 having a penetrating stem 11, a pressing head 16 mounted on an upper end of the stem 11 and having a discharge hole 16a for discharging contents, and a pressing head 16 positioned at a descending end position are provided. The control cylinder 22 is detachably mounted and restricts upward movement of the push head 16 and the stem 11.

The pump 24 is fitted in the stem 11, a cylindrical piston 14 linked to the vertical movement of the stem 11, a cylinder 15 having a sliding cylinder portion 15a in which the piston 14 is vertically slidably fitted, and a stem 11. A piston guide 17 that protrudes downward from the stem 11 and penetrates the inside of the piston 14 in the vertical direction, a lower valve body 18 that opens and closes the lower end opening of the cylinder 15, and is arranged in the cylinder 15, and the piston guide 17 is attached upward. And a coil spring 19 for urging.

The mounting cap 21, the stem 11, the restricting cylinder 22, the piston 14, the cylinder 15, and the coil spring 19 are arranged coaxially with a common shaft extending in the vertical direction. Hereinafter, this common axis is referred to as an axis O, a direction intersecting with the axis O when viewed from above and below is referred to as a radial direction, and a direction that surrounds the axis O is referred to as a circumferential direction.

The container body W includes a flexible bag-shaped pouch W1 that is deformed and reduced in volume as the content decreases, and a spout W3 fixed to the upper end of the pouch W1 and having a mouth W2.
The piston 14 has an outer cylinder 28 slidingly contacting the inner peripheral surface of the cylinder 15, an inner cylinder 29 disposed inside the outer cylinder 28, and an annular coupling that couples the outer cylinder 28 and the inner cylinder 29 over the entire circumference. And a section 27.
The connecting portion 27 connects the intermediate portions located between the upper end portion and the lower end portion of each of the outer cylinder 28 and the inner cylinder 29. In the standby state in which the push-down head 16 and the stem 11 are located at the rising end position as shown in FIG. 2, the upper surface of the coupling portion 27 is located below the lower end opening edge of the stem 11, and the push-down head 16 is When pressed down, the lower end opening edge of the stem 11 contacts the upper surface of the connecting portion 27. The inner cylinder 29 is vertically slidably fitted in the lower end of the stem 11.

A flange portion 15d that projects outward in the radial direction is formed on the top of the cylinder 15 over the entire circumference, and the flange portion 15d is arranged on the upper end opening edge of the mouth portion W2 of the container body W. The cylinder 15 is located below the sliding tubular portion 15a, has an inner diameter smaller than the inner diameter of the sliding tubular portion 15a, and has a lower tubular body 18 disposed inside thereof. And a connecting tube portion 15c that protrudes toward.
A suction pipe 15e having a lower end opening located at the bottom of the container body W is fitted in the connecting cylinder portion 15c.

The mounting cap 21 is formed in a cylindrical shape having a top wall portion 21a having an annular shape. On the inner peripheral surface of the mounting cap 21, a female screw portion that is screwed into the mouth portion W2 is formed.
The top wall portion 21a is arranged on the upper surface of the flange portion 15d of the cylinder 15. The upper end of the cylinder 15, which is located above the flange 15d, is inserted inside the top wall 21a.

The piston guide 17 includes a cylindrical mounting portion 31 fitted in the lower portion of the stem 11. The mounting portion 31 projects downward from the lower end opening of the stem 11. As shown in FIG. 1, the mounting portion 31 is located inside the sliding tubular portion 15 a of the cylinder 15 with the piston guide 17 located at the lower end position. A through hole 31b that opens in the radial direction is formed at the lower end of the mounting portion 31. When viewed from the outside in the radial direction, the through hole 31b has a rectangular shape that is long in the vertical direction, in which the long side extends straight in the vertical direction and the short side has a protruding curved shape toward the outside in the vertical direction.

The piston guide 17 includes a plug portion (lower end portion) 13 that projects downward from the lower end portion of the mounting portion 31. The plug portion 13 is formed in a cylindrical shape with a top. The inner diameter and the outer diameter of the peripheral wall portion of the plug portion 13 are larger than the inner diameter and the outer diameter of the mounting portion 31, respectively. The inner diameter of the peripheral wall portion of the plug portion 13 is larger than the outer diameter of the mounting portion 31. Of the ceiling wall portion of the plug portion 13, an outer portion in the radial direction gradually extends upward from the upper end portion of the peripheral wall portion toward the inner side in the radial direction, and an inner portion in the radial direction is formed flat, It is connected to the lower end of the mounting portion 31.

In the standby state in which the push-down head 16 and the stem 11 are located at the rising end position, the lower end of the inner cylinder 29 of the piston 14 is in contact with the upper surface of the radially outer portion of the top wall of the plug 13. As a result, communication between the portion of the cylinder 15 located below the piston 14 and the through hole 31b of the piston guide 17 is blocked.
When the depressing head 16 is depressed, the upper surface of the radially outer portion of the top wall portion of the plug portion 13 separates downward from the lower end portion of the inner cylinder 29 of the piston 14, and is positioned below the piston 14 in the cylinder 15. The portion communicates with the through hole 31b of the piston guide 17.
After the push head 16 is pushed to discharge the content, when the stem 11 is restored and moved upward, the upper surface of the radially outer portion of the top wall portion of the plug portion 13 is the lower end of the inner cylinder 29 of the piston 14. By abutting against the portion, the piston 14 is restored and moved upward in a state where the communication between the portion located below the piston 14 and the through hole 31b of the piston guide 17 in the cylinder 15 is blocked.

On the outer peripheral surface of the peripheral wall portion of the plug portion 13, a plurality of proximity protrusions 13a that are close to the inner peripheral surface of the sliding cylinder portion 15a of the cylinder 15 are formed at intervals in the circumferential direction. The radially outer end portion of the proximity protrusion 13a is located radially outside of the inner peripheral surface of the housing tubular portion 15b of the cylinder 15. With the piston guide 17 positioned at the lower end position, the proximity protrusion 13a is positioned at the lower end of the sliding cylinder portion 15a of the cylinder 15. The proximity protrusion 13 a is arranged at the upper end of the peripheral wall of the plug 13.

The lower portion of the peripheral wall portion of the plug portion 13, which is located below the proximity protrusion 13a, is detachably fitted into the accommodating cylinder portion 15b when the piston guide 17 is located at the lower end position together with the pressing head 16 and the stem 11. Then, the communication between the inside of the housing cylinder portion 15b and the inside of the sliding cylinder portion 15a is cut off.

The lower valve body 18 is arranged in a portion located below the piston guide 17 in the cylinder 15 in the standby state where the push-down head 16 and the stem 11 are located at the rising end position. The lower valve body 18 is arranged in the housing cylinder portion 15b. In the illustrated example, the upper end portion of the lower valve body 18 is located inside the lower end portion of the sliding tubular portion 15a.
The lower valve body 18 is elastically deformable with a fitting portion 33 fitted in the housing tubular portion 15b, a valve body 34 arranged inside the fitting portion 33 and opening/closing a lower end opening of the cylinder 15. The connection piece 34a is formed and connects the valve body 34 and the inner peripheral surface of the fitting portion 33.

The fitting portion 33 includes a lower portion 33a fitted in the lower end portion of the housing tubular portion 15b, and an upper portion 33b extending upward from the lower portion 33a.
The upper portion 33b is located radially inward of the lower portion 33a. The upper portion 33b is arranged on the axis O.
The lower portion 33a includes an annular body located at the lower end portion and extending continuously over the entire circumference, and a connecting plate that connects the upper end opening edge of the annular body and the lower end edge of the upper portion 33b. The connecting plates are separately arranged on both sides sandwiching the axis O in the radial direction, and have a seat surface 33c facing upward. The seat surface 33c vertically faces the lower opening edge of the plug portion 13 of the piston guide 17.

The valve main body 34 is mounted on the inner surface of the housing tubular portion 15b so as to be separated upward toward the peripheral edge of the lower end opening of the housing tubular portion 15b. The valve body 34 is arranged inside the lower portion 33 a of the fitting portion 33. The valve body 34 is connected to the inner peripheral surface of the annular body in the lower portion 33a of the fitting portion 33 via an elastically deformable connecting piece 34a.

The lower valve body 18 is a check valve that keeps the lower end opening of the cylinder 15 closed when the cylinder 15 is pressurized and opens the lower end opening of the cylinder 15 when the cylinder 15 is depressurized. As a result, when the pressure in the cylinder 15 is increased, the content in the cylinder 15 is prevented from returning from the lower end opening of the cylinder 15 into the container body W, and when the pressure in the cylinder 15 is reduced, the content in the container body W is It flows into the cylinder 15 through the lower end opening of the cylinder 15.

The coil spring 19 includes an upper end spring portion 19a inserted into the plug portion 13 of the piston guide 17, a main body spring portion 19b extending downward from the upper end spring portion 19a and having a larger outer diameter and inner diameter than the upper end spring portion 19a. , And urges the stem 11 and the piston guide 17 integrally upward.

The outer peripheral surface of the upper end spring portion 19a is in contact with or close to the inner peripheral surface of the plug portion 13 of the piston guide 17. The upper end opening edge of the upper end spring portion 19a is located below the lower surface of the top wall portion of the plug portion 13 and is not in contact with the inner surface of the plug portion 13. The length of the upper end spring portion 19a is shorter than the length of the main body spring portion 19b.
The upper end opening edge of the main body spring portion 19b and the lower end opening edge of the plug portion 13 are in contact with each other. The thickness of the plug portion 13 is equal to the wire diameter of the coil spring 19. The upper portion 33b of the fitting portion 33 is inserted inside the lower portion of the main body spring portion 19b. The inner peripheral surface of the lower end portion of the main body spring portion 19b is in contact with or close to the upper portion 33b. The lower end opening edge of the main body spring portion 19b is in contact with the seat surface 33c of the fitting portion 33.

The pressing head 16 includes a fitting cylinder 16b fitted onto the upper end of the stem 11, a discharge cylinder 16c protruding outward from the fitting cylinder 16b in the radial direction, and a discharge hole 16a formed at the tip thereof. And a threaded cylinder 16d that surrounds the fitting cylinder 16b from the outside in the radial direction. The discharge cylinder 16c penetrates the threaded cylinder 16d in the radial direction. A seal projection 16e is formed on the outer peripheral surface of the fitting cylinder 16b and extends continuously over the entire circumference.

The restriction cylinder 22 includes an external fitting cylinder 22a that is externally fitted to the upper end of the cylinder 15, and a male screw cylinder 22b to which the screw fitting cylinder 16d of the pressing head 16 located at the descending end position is screwed.
The lower end of the outer fitting cylinder 22a is connected to the inner peripheral edge of the top wall 21a of the mounting cap 21, and the restriction cylinder 22 and the mounting cap 21 are integrally formed.

A lower portion of the male screw cylinder 22b is inserted into the upper end portion of the cylinder 15, an upper portion thereof projects upward from the upper end portion of the cylinder 15, and a male screw portion is formed on the outer peripheral surface of the upper portion. The outer peripheral surface of the lower portion of the male screw cylinder 22b and the inner peripheral surface of the upper end portion of the cylinder 15 are formed with detent portions that engage with each other. An introduction passage 25 is formed between the inner peripheral surface of the male screw cylinder 22b and the outer peripheral surface of the stem 11 so as to communicate the outside with the inner peripheral surface of the outer cylinder 28 of the piston 14. In the standby state in which the push-down head 16 and the stem 11 are located at the rising end position, the upper end opening edge of the outer cylinder 28 of the piston 14 comes into contact with or approaches the lower end opening edge of the male screw cylinder 22b.

A seal cylinder portion 22c protruding upward is formed at the upper opening edge of the male screw cylinder 22b. In a state where the stem 11 and the pressing head 16 are located at the lower end position and the pressing head 16 is screwed to the restriction tube 22, the seal projection 16e of the pressing head 16 is closely fitted in the seal tube portion 22c. To do.

A method of using the discharger 1 configured as above will be described.

First, by rotating the push-down head 16 located at the descending end position about the axis O with respect to the restricting cylinder 22, the female screw portion of the screwing cylinder 16d of the press-down head 16 and the external screw thread of the male screw cylinder 22b of the restricting cylinder 22. Unscrew the section. At this time, the push-down head 16, the stem 11, and the piston guide 17 are raised with respect to the cylinder 15, and the plug portion 13 of the piston guide 17 is disengaged from the accommodating cylinder portion 15b of the cylinder 15 and slides inside the accommodating cylinder portion 15b. The inside of the moving cylinder portion 15a communicates. Then, the upward biasing force of the coil spring 19 causes the piston guide 17, the stem 11, and the pressing head 16 to integrally rise. In this process, the upper surface of the radially outer portion of the top wall portion of the plug portion 13 of the piston guide 17 contacts the lower end portion of the inner cylinder 29 of the piston 14, and the piston 14 also rises.
As a result, the inside of the cylinder 15 is decompressed, the lower valve body 18 opens the lower end opening of the cylinder 15, and the contents in the container body W flow into the cylinder 15 through the suction pipe 15e.

When the pushing head 16 is pushed down to move the stem 11 and the piston guide 17 downward, first, the upper surface of the radially outer portion of the top wall portion of the plug portion 13 of the piston guide 17 is the inner cylinder of the piston 14. A portion located below the piston 14 in the cylinder 15 apart from the lower end portion of the piston 29 communicates with the through hole 31b of the piston guide 17, and the lower end opening edge of the stem 11 is connected to the piston 14 It contacts the upper surface of the connecting portion 27. Further, when this downward movement is continued, the piston 14 also moves downward, so that the contents in the cylinder 15 flow into the stem 11 through the through hole 31b and the mounting portion 31 in the piston guide 17, and the discharge hole 16a. Is discharged from.
Then, when the pressing head 16 is released, the piston guide 17, the piston 14, the stem 11, and the pressing head 16 are restored and moved upward by the upward biasing force of the coil spring 19, and the container body W is moved. The contents inside flow into the cylinder 15.

As described above, according to the dispenser 1 according to the present embodiment, the coil spring 19 extends downward from the upper end spring portion 19a inserted into the plug portion 13 of the piston guide 17, and the upper end spring portion 19a. Since the main body spring portion 19b having a larger outer diameter and inner diameter is provided, and the upper end opening edge of the main body spring portion 19b and the lower end opening edge of the piston guide 17 are in contact with each other, the pushing head 16 is pushed down to move the stem. When the 11 and the piston guide 17 are moved downward, a vertical compressive force is applied to the main body spring portion 19b having a larger outer diameter and inner diameter than the upper end spring portion 19a. Therefore, it becomes possible to suppress the generated upward biasing force to a low level, and to discharge the contents from the discharge hole 16a, as compared with the case where a vertical compression force is applied to a coil spring having an outer diameter and an inner diameter equal to those of the upper end spring portion 19a. It is possible to reduce the pressing force applied to the pressing head 16 when ejecting from.

Since the upper end spring portion 19a of the coil spring 19 having the smaller inner diameter and outer diameter is inserted into the plug portion 13 of the piston guide 17, the coil spring 19 can be easily assembled and the settability is improved. Can be made
Further, since the outer peripheral surface of the upper end spring portion 19a is in contact with or close to the inner peripheral surface of the plug portion 13 of the piston guide 17, the coil spring 19 is prevented from wobbling in the radial direction with respect to the piston guide 17. can do.

The present invention is not limited to the above-described embodiments, but can be modified as appropriate without departing from the spirit of the invention.

For example, in the above-described embodiment, the configuration in which the pressing head 16 located at the lower end position is detachably screwed as the restricting cylinder 22 is shown, but the invention is not limited to this. The configuration may be changed or the like may be appropriately changed.
The mounting cap 21 and the regulation cylinder 22 may be separate members, and the regulation cylinder 22 may not be provided.
The upper end opening edge of the upper end spring portion 19a may be brought into contact with the inner surface of the plug portion 13.
An introduction hole may be formed in the cylinder 15 so as to open in the radial direction and connect the inside of the container body W and the inside of the cylinder 15. The introduction hole may be closed on the outer peripheral surface of the outer cylinder 28 in the standby state as shown in FIG. When the introduction hole is formed in the cylinder 15, the container body W does not have to undergo volumetric deformation.

Besides, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

1 Discharger 11 Stem 13 Plug (lower end of piston guide)
14 piston 15 cylinder 15b accommodating cylinder portion 16 pressing head 16a discharge hole 17 piston guide 18 lower valve body 19 coil spring 19a upper end spring portion 19b body spring portion 21 mounting cap 24 pump 33 fitting portion 34 valve body 34a connecting piece W container body W2 mouth

Claims (2)

A mounting cap mounted on the mouth of the container body,
A pump having a stem that penetrates through the mounting cap so as to be movable downward while being biased upward;
A pressing head mounted on the upper end of the stem and having a discharge hole for discharging contents,
The pump is
A cylindrical piston linked to the vertical movement of the stem,
A cylinder in which the piston is vertically slidably fitted,
A piston guide fitted in the stem, protruding downward from the stem, and vertically penetrating the inside of the piston;
A lower valve body that opens and closes the lower end opening of the cylinder,
A coil spring disposed in the cylinder and biasing the piston guide upward,
The cylinder includes an accommodating cylinder portion in which the lower valve body is disposed,
The lower valve body is formed so as to be elastically deformable, and a fitting portion fitted in the accommodating cylinder portion, a valve body arranged inside the fitting portion and opening and closing a lower end opening of the cylinder. Together with a connecting piece that connects the valve body and the inner peripheral surface of the fitting portion,
The lower end portion of the piston guide is formed into a cylindrical shape with a top,
The coil spring includes an upper end spring part inserted into the lower end part of the piston guide, and a main body spring part extending downward from the upper end spring part and having a larger outer diameter and inner diameter than the upper end spring part,
The upper end opening edge of the main body spring portion and the lower end opening edge of the piston guide abut,
The upper end opening portion of the upper end spring portion is not in contact with the inner surface of the lower end portion of the piston guide. The dispenser according to claim 1, wherein the outer peripheral surface of the upper end spring portion is in contact with or close to the inner peripheral surface of the lower end portion of the piston guide.

Images