JP5222576B2 - Discharger and piston member - Google Patents

Description

  The present invention relates to a discharger for discharging a liquid and a piston member applied to the discharger.

  Conventionally, as this type of dispenser, a stem standing upright in the mouth of the container body, a pressing head attached to the upper end of the stem and having a nozzle hole, and the stem can be moved up and down. A mounting portion that is inserted into the mouth of the container body, an air cylinder in which a first piston member linked to the pressing head and the stem slides in the vertical direction, and the pressing A liquid cylinder in which a second piston member linked to the head and the stem slides vertically; a gas-liquid mixing chamber in which air from the air cylinder and liquid from the liquid cylinder merge; and the nozzle The structure provided with the foaming member installed between the hole and the gas-liquid mixing chamber is known. In the discharge device having this configuration, by pressing down the pressing head to pressurize the air in the air cylinder and the liquid in the liquid cylinder, the liquid and the air are transferred to the gas-liquid mixing chamber to be combined and foamed. Foaming is performed through the member, and the liquid is ejected from the nozzle hole in the form of foam.

In the discharger, in order to pressurize and transfer air and liquid to the gas-liquid mixing chamber, the inner surface of the air cylinder, the outer surface of the first piston member, the inner surface of the liquid cylinder, and the outer surface of the second piston member are strongly strengthened. It is necessary to adhere. Therefore, it is possible to improve the adhesion by setting a large pressure contact force between the piston and the cylinder, but the sliding resistance force between the piston and the cylinder is increased accordingly, and the operability is deteriorated. In particular, in the above-described discharger, the first piston member and the second piston member are pushed down at a time when the stem and the press head that are erected in the upward biased state are pressed downward. A large force is required to press the pressing head. Therefore, if the pressure contact force between the piston and the cylinder is set large as described above, the resistance force when the pressing head is pressed increases, and a user with weak force can discharge the required amount of content liquid. There was something that could not be done.
On the other hand, in order to improve operability, when the pressure contact force between the first and second piston members and the air cylinder and the liquid cylinder is set to be small at the time of manufacture of the discharge device, the pressure contact force gradually increases with use. There was a risk that the liquid content could not be properly discharged due to deterioration in airtightness and liquid tightness.

Therefore, Patent Document 1 discloses a dispenser capable of ensuring airtightness and liquid tightness by coating the piston surface with a lubricant such as silicon and pushing down the stem and the pressing head with a small force. Proposed.
JP 2004-148192 A

  However, when the lubricant such as silicon is coated on the surface of the first piston member or the second piston member, there is a problem that the assembly process increases.

The present invention has been made in view of such circumstances, and can press the pressing head and the stem with a small force, and prevent a decrease in the pressure contact force between the piston member and the cylinder linked to the pressing head and the stem. It is an object of the present invention to provide a discharger and a piston member that can ensure airtightness and liquid tightness.
It is another object of the present invention to provide a piston member that is used in various types of dispensers and has good sliding characteristics without causing an increase in assembly process.

In order to solve the above problems and achieve such an object, the discharger of the present invention is attached to the mouth of the container body in an upwardly biased state, and attached to the upper end of the stem, A pressing head having a nozzle hole formed therein, an insertion hole into which the stem is inserted so as to be movable up and down, a mounting portion to be mounted on the mouth of the container body, and a first piston member linked to the pressing head and the stem The cylinder for air that slides in the vertical direction inside, the cylinder for liquid that the second piston member linked to the pressing head and the stem slides in the vertical direction inside, the air from the cylinder for air and the liquid A gas-liquid mixing chamber in which liquid from the cylinder merges, and a foam member installed between the nozzle hole and the gas-liquid mixing chamber, and the pressing head is attached to the mouth of the container body. Push down the air By pressurizing the air in the cylinder and the liquid in the liquid cylinder, these air and liquid are transferred to the gas-liquid mixing chamber, merged, foamed through the foaming member, and discharged from the nozzle hole. The first piston member includes a first piston main body and a first sliding contact portion that is in sliding contact with the inner surface of the air cylinder, and the first sliding contact portion is the first piston main body. The second piston member has a second piston body and a second sliding contact portion that is in sliding contact with the inner surface of the liquid cylinder, and the second sliding contact portion. However, the first piston member, which is made of a soft material having a lower hardness than the second piston main body and slides in the air cylinder, has a first piston main body and a first sliding contact portion each formed of a resin material. With a single-piece structure And wherein the are.
In this invention, the 1st piston member has the 1st piston main part and the 1st sliding contact part which contacts the inner surface of the cylinder for air, and the 1st sliding contact part is softer whose hardness is lower than the 1st piston main part. The second piston member has a second piston main body and a second sliding contact portion that is in sliding contact with the inner surface of the liquid cylinder, and the second sliding contact portion is formed from the second piston main body. Since the first and second sliding contact portions are elastically deformed when the stem and the pressing head are pushed down, the airtightness with the air cylinder is also constituted. In addition, it is possible to push down the stem and the pressing head with a small force while ensuring liquid tightness with the liquid cylinder.
Further, since a lubricant such as silicon is not used, the dispenser can be manufactured at a low cost without a lubricant coating step.

In addition, since the first piston body and the first sliding contact portion are integrally formed, the first sliding contact portion is relatively easy to mold and has excellent dimensional stability. Thereby, the 1st piston member which can ensure airtightness with the cylinder for air reliably can be provided.

Furthermore, the second piston member that slides in the liquid cylinder may be configured such that a second piston body and a second sliding contact portion, each formed of a resin material, are integrally formed.
In this case, since the second piston main body and the second slidable contact portion are integrally formed, the second slidable contact portion is relatively easy to mold and has excellent dimensional stability. Thereby, the 2nd piston member which can ensure liquid-tightness with the cylinder for liquids reliably can be provided.

The piston member of the present invention is a piston member that slides inside a cylinder, and is located in the outer peripheral ends of the piston main body made of a resin material and the upper and lower portions of the piston main body, and is in sliding contact with the inner surface of the cylinder. The sliding contact portion is formed of a soft material having a lower hardness than the resin material forming the piston body, and the piston body and the sliding contact portion are integrally formed, and the piston At least a part of the circumferential direction of the main body is formed with a slidable contact portion positioned at the upper portion of the piston main body and a connecting groove portion connected to the slidable contact portion positioned at the lower portion, and the connecting groove portion is made of the soft material. A band-shaped portion is formed.
In this invention, a piston member made of a resin material and a sliding contact portion formed of a soft material having a hardness lower than that of the resin material forming the piston main body are integrally formed, and at least a part in the circumferential direction of the piston main body Since the connecting groove part connected with the sliding contact part located in the upper part of the piston body and the sliding contact part located in the lower part is formed, the soft material forming the sliding contact part is injected through the connecting groove part. Thus, it is possible to form the sliding contact portion located at the upper portion of the piston body and the sliding contact portion located at the lower portion without disposing the soft material on the entire outer peripheral surface of the piston body, thereby reducing the use amount of the soft material. be able to. Further, the piston main body and the sliding contact portion can be easily formed with high dimensional accuracy.

Here, a communication hole that penetrates a part of the piston body may be formed in at least a part of the communication groove.
In this case, it becomes possible to inject the soft material into the place where the sliding contact portion is formed through the communication hole portion, and it is possible to suppress the occurrence of trouble by shortening the injection path of the soft material, and the usage amount of the soft material Can be reduced.

According to the discharge device and the piston member according to the present invention, the pressing head and the stem can be pressed with a small force, and the pressure contact force between the piston member and the cylinder linked to the pressing head and the stem is prevented from being lowered, thereby being airtight. Liquid-tightness can be ensured.
Further, the piston member according to the present invention can be molded without increasing the assembly process, can be used for various types of dispensers, and can obtain good sliding characteristics. Further, the amount of the soft material used can be reduced as compared with the configuration in which the soft material is disposed on the entire outer peripheral surface of the piston body.

  Embodiments of the present invention will be described below with reference to the drawings. The discharge device 1 according to the present embodiment includes a stem 10 that is erected in an upwardly biased state at a mouth portion of a container body (not shown), and a pressing head 20 that is attached to the upper end of the stem 10 and has a nozzle hole 21 formed therein. And a mounting portion 30 provided with an insertion hole 31 into which the stem 10 is inserted so as to be movable up and down, and a first piston member 40 (first piston) linked to the pressing head 20 and the stem 10. The cylinder 15 for air in which the member) slides in the vertical direction, and the liquid cylinder 16 in which the second piston member 50 (second piston member) linked to the pressing head 20 and the stem 10 slides in the vertical direction. And the gas-liquid mixing chamber 2 where the air from the air cylinder 15 and the liquid from the liquid cylinder 16 merge, and the foaming part installed between the gas-liquid mixing chamber 2 and the nozzle hole 21 It is provided with a 60, a.

  In the illustrated example, the mounting portion 30 includes a ceiling wall portion 32 in which an insertion hole 31 is formed, a mounting peripheral wall portion 33 extending downward from an outer peripheral edge of the ceiling wall portion 32, and a ceiling wall portion 32. And a guide tube portion 34 extending upward from the outer peripheral edge portion of the insertion hole 31, and a screw portion 35 for being screwed to the container body is formed on the inner peripheral surface of the mounting peripheral wall portion 33. Has been.

  The liquid cylinder 16 and the air cylinder 15 each have a cylindrical shape. In this embodiment, the liquid cylinder 16 and the air cylinder 15 are integrally formed, and the outer peripheral surface at the upper end opening of the air cylinder 15 is formed. The mounting peripheral wall portion 33 and the top wall portion 32 of the mounting portion 30 are in close contact with the inner surface. Here, the air cylinder 15 is formed in a bottomed cylindrical shape, and a cylindrical liquid cylinder 16 is connected to the bottom of the cylinder 15 in a state where the inside thereof and the inside of the air cylinder 15 communicate with each other. Yes. That is, the small-diameter liquid cylinder 16 is continuously provided below the large-diameter air cylinder 15.

  Further, the pressing head 20 having the nozzle hole 21 has a fitting cylinder portion 22 extending downward and having the stem 10 fitted therein, and a fitting cylinder portion 22 extending downward and extending downward. And a surrounding cylinder portion 23 that surrounds the outside from the outside in the radial direction. The fitting tube portion 22 is inserted in the guide tube portion 34 provided in the mounting portion 30 and the insertion hole 31 so as to be movable up and down. The inner diameter of the insertion hole 31 is the same as the inner diameter of the guide tube portion 34. Further, the inner diameter of the surrounding tube portion 23 is larger than the outer diameter of the guide tube portion 34, and when the pressing head 20 is pushed down, the inner peripheral surface of the surrounding tube portion 23 and the outer peripheral surface of the guide tube portion 34 are separated. Opposing in the radial direction.

Inside the fitting cylinder portion 22 of the pressing head 20, a foam member 60 is disposed on the upper side, and an upper end portion of the stem 10 is fitted on the lower side.
The foam member 60 includes a cylindrical casing 61 and two foam elements 62 inserted into the casing 61. The casing 61 has a two-stage cylindrical shape having a large diameter portion on the upper side and a small diameter portion on the lower side. The large diameter portion is inserted and fixed inside the fitting tube portion 22, and the small diameter portion is the upper end portion of the stem 10. Is inserted inside. A plurality of casing grooves 61a are formed on the outer peripheral surface of the small diameter portion so as to extend upward from the lower end thereof to reach the outer surface of the bottom portion of the large diameter portion and extend outward in the radial direction.
Further, the foam element 62 has a structure in which a net is stretched on the cylindrical main body. In the foam element 62 disposed on the lower side in the casing 61, a net is stretched on the lower opening surface of the cylindrical main body. In the foam element 62 arranged on the upper side in the casing 61, a net is stretched on the upper opening surface of the cylindrical main body.

  The stem 10 protrudes downward from the lower end opening surfaces of the pressing head 20 and the fitting cylinder portion 22. Here, a plurality of vertical grooves 22 a extending in the vertical direction and opening downward are formed in a portion where the upper end portion of the stem 10 is fitted on the inner peripheral surface of the fitting cylinder portion 22. These vertical grooves 22 a are in communication with a plurality of casing grooves 61 a formed in the casing 61 of the foam member 60 across the upper end opening edge of the stem 10.

  As shown in FIGS. 2 to 4, the first piston member 40 that slides in the air cylinder 15 includes a first piston body 41 made of a general resin material such as polyolefin, polyester, polypropylene, and the like. A first sliding contact portion formed on the outer peripheral side of the first piston main body 41 and in sliding contact with the inner surface of the air cylinder 15 and the inner peripheral surface of the lower end side of the fitting cylinder portion 22; The first sliding contact portion 46 is formed of a soft material having a hardness lower than that of the resin material constituting the first piston body 41, for example, a rubber-like elastic body such as an olefin-based, styrene-based, or polyester-based thermoplastic elastomer. .

Here, the first piston body 41 and the first sliding contact portion 46 are integrally formed by insert molding. Specifically, first, the first piston body 41 is molded by injecting a resin material forming the first piston body 41 into a mold. At this time, a communication groove portion 42 extending outward from the radially inner end of the first piston main body 41 is provided in a part of the first piston main body 41 in the circumferential direction. Here, as shown in FIG. 4, a communication hole portion 43 that communicates toward a portion where the first sliding contact portion 46 is formed is formed in the radially outer portion of the first piston body 41 in the communication groove portion 42. Is formed. The communication hole 43 is formed by arranging the parts of the two molds so as to contact each other when the first piston body 41 is molded.
By placing the first piston body 41 in another mold and injecting a soft material constituting the first sliding contact portion 46, the soft material spreads through the communication groove portion 42 and the communication hole portion 43, and the first piston The first piston member 40 in which the main body 41 and the first sliding contact portion 46 are integrally formed is produced.

The first piston member 40 produced in this way has a multistage cylindrical shape, and is fitted to the outer cylinder 47, the inner cylinder 48 disposed inside the outer cylinder 47, and the outer peripheral surface of the inner cylinder 48. And a valve body 49 that opens and closes a gap between the outer cylinder 47 and the inner cylinder 48. Among these, a portion connected to the upper end portion of the stem 10 is inserted inside the inner cylinder 48 so as to be movable up and down.
Further, a first sliding contact portion 46 slidably contacting the lower end side inner peripheral surface of the fitting cylindrical portion 22 is formed over the entire circumference of the inner cylinder 48 at the upper end of the outer peripheral surface of the inner cylinder 48 in the first piston member 40. ing. Furthermore, a first sliding contact portion 46 that is in sliding contact with the inner surface of the air cylinder 15 is formed on the upper end and the lower end of the outer peripheral surface of the outer cylinder 47 over the entire circumference of the inner cylinder 48. Here, the communication groove portion 42 communicates with the first sliding contact portion 46 formed at the upper portion of the outer cylinder 47 and the first sliding contact portion 46 formed at the lower portion, and at the upper end of the outer peripheral surface of the inner cylinder 48. The first sliding contact portion 46 is also communicated. By filling the connecting groove portion 42 with a soft material that forms the first sliding contact portion 46, a belt-like portion 44 extending from the upper end to the lower end in a part of the circumferential direction is formed on the outer peripheral surface of the first piston member 40. Is formed.

  Such a first piston member 40 is inserted in the lower end portion of the fitting cylinder portion 22 in a vertically movable manner with a vertical gap S between the upper end of the inner cylinder 48 and the inner surface of the fitting cylinder portion 22. The first sliding contact portion 46 is in close contact with the inner peripheral surface of the lower end portion of the fitting cylinder portion 22, and the first sliding contact portion 46 formed on the upper end and the lower end of the outer peripheral surface of the outer tube 47 is for air. The cylinder 15 is in close contact with the inner surface. Accordingly, the first piston member 40 can slide up and down in the air cylinder 15 in an airtight state.

  Here, in the gap S, a vertical groove 22 a formed in the inner peripheral surface of the fitting cylinder portion 22 is opened. In addition, on the outer peripheral surface of the stem 10, a plurality of stem grooves 10 a extending in the vertical direction and opening in the gap are formed in a portion where the inner peripheral surface of the inner cylinder 48 of the first piston member 40 moves up and down. ing. The air cylinder 15 and the gas-liquid mixing chamber 2 are connected by the stem groove 10a, the vertical groove 22a formed in the fitting cylinder portion 22, the casing groove 61a formed in the casing 61 of the foaming member 60, and the gap S. A communicating air passage 5 is configured.

  Next, the second piston member 50 disposed inside the stem 10 and in the liquid cylinder 16 and sliding up and down will be described with reference to FIG. The second piston member 50 is, for example, a second piston body 51 formed of a general resin material such as polyolefin, polyester, or polypropylene, and is disposed on the outer peripheral side of the second piston body 51. The second sliding contact portion 56 slides. Here, the second sliding contact portion 56 is formed of a soft material having a lower hardness than the resin material constituting the second piston main body 51, for example, a rubber-like elastic body such as an olefin-based, styrene-based, or polyester-based thermoplastic elastomer. Has been.

  In the second piston main body 51, the upper end side is a small-diameter cylindrical portion 57 that is inserted and fixed inside the stem 10 in a liquid-tight state, the lower end side protrudes downward from the lower end opening surface of the stem 10, and the outer peripheral surface thereof is the stem. 10 is a large-diameter cylindrical portion 58 that is substantially flush with the outer peripheral surface. And the 2nd sliding contact part 56 is formed in the upper part and lower part of the outer peripheral end of this large diameter cylinder part 58. As shown in FIG. The second sliding contact portion 56 is formed so as to extend over the entire circumference of the large diameter cylindrical portion 58 (second piston main body 51). As a result, the second piston member 50 can slide up and down in a liquid-tight state in the liquid cylinder 16.

  As for the second piston member 50, similarly to the first piston member 40 described above, the second piston main body 51 and the second sliding contact portion 56 are integrally formed by insert molding. Further, the second piston main body 51 communicates with a second sliding contact portion 56 formed on the upper portion of the large-diameter cylindrical portion 58 and a second sliding contact portion 56 formed on the lower portion thereof in a part of the circumferential direction thereof. The connecting groove portion 52 is provided. The connecting groove portion 52 is filled with a soft material forming the second sliding contact portion 56, and a belt-like portion 54 extending in the vertical direction is formed on the outer peripheral surface of the second piston main body 51. Has been.

  Further, the upper piston body 17a having an upper end portion formed in a hollow inverted conical shape is formed inside the second piston member 50 and the liquid cylinder 16, and the lower end portion is seated on and separated from the lower end opening in the liquid cylinder 16. A columnar valve member 17 which is a possible lower valve body (not shown) is provided. A coil spring 4 that urges the second piston member 50 upward is disposed between the second piston member 50 and the lower valve body.

  Here, on the inner peripheral surface of the stem 10, an annular valve seat 12 protrudes radially inward at a portion located between the second piston member 50 and the foaming member 60. A spherical liquid discharge valve 13 is provided on the valve seat 12 so as to be seated and separated. In the stem 10, a space between the lower end of the small diameter portion of the foam member 60 and the upper surface of the valve seat 12 is the gas-liquid mixing chamber 2.

  Further, on the outer peripheral surface of the stem 10, a protruding portion 11 is projected over the entire periphery of the portion where the lower ends of the plurality of stem grooves 10 a are located, and on the upper surface of the protruding portion 11, FIG. In the state where the pressing head 20 is urged upward, the lower end of the inner cylinder 48 in the first piston member 40 abuts, thereby closing the opening of the air passage 5 in the air cylinder 15, Communication between the inside of the air cylinder 15 and the gas-liquid mixing chamber 2 is blocked. Further, when the pressing head 20 is pressed down, the lower surface of the projecting portion 11 comes into contact with the opening peripheral edge of the liquid cylinder 16 on the bottom surface in the air cylinder 15 so that the pressing down can be restricted. .

  As shown in FIG. 1, the discharge device 1 configured as described above has the first piston member 40 on the upper surface of the protruding portion 11 of the stem 10 in a state where the pressing head 20 is biased upward. The lower end of the inner cylinder 48 abuts, and a vertical gap is provided between the lower end of the pressing head 20 and the outer surface of the first piston member 40.

When the pressing head 20 is pushed down from this state, the fitting cylinder portion 22 is pushed down, and the foam member 60, the stem 10, and the second piston member 50 are moved downward. At this time, the first piston member 40 does not move, and a gap is formed between the lower end of the inner cylinder 48 of the first piston member 40 and the protruding portion 11 of the stem 10, and the first piston member 40 The gap S between the upper end of the inner cylinder 48 and the inner surface of the fitting cylinder portion 22 becomes small but does not disappear, so that the air cylinder 15 and the gas-liquid mixing chamber 2 communicate with each other through the air passage 5.
Further, as the second piston member 50 moves downward, the lower valve body is also moved downward, and the lower valve body is seated and closed at the lower end opening of the liquid cylinder 16.

  When the pressing head 20 is further pushed down, the first piston member 40 is also moved downward in a state where the valve body 49 closes the gap between the outer cylinder 47 and the inner cylinder 48, whereby the air cylinder 15 The air in the lower chamber located below the first piston member 40 is compressed inside. As a result, the air in the lower chamber flows into the air passage 5 from the gap between the lower end of the inner cylinder 48 of the first piston member 40 and the protruding portion 11 of the stem 10 and is transferred to the gas-liquid mixing chamber 2. Is done.

  Further, at this time, in a state where the lower end opening in the liquid cylinder 16 is closed by the lower valve body, the second piston member 50 is moved downward while compressing and deforming the coil spring 4, and the upper valve body 17a is moved to the first position. 2 Move away from the upper end opening of the piston member 50. Then, the liquid pressure in the liquid cylinder 16 is applied to the liquid discharge valve 13 seated on the valve seat 12 of the stem 10 to separate the liquid discharge valve 13 from the valve seat 12. The liquid inside is transferred into the gas-liquid mixing chamber 2.

As described above, after the liquid and air are merged in the gas-liquid mixing chamber 2 and passed through the foaming member 60 to foam the liquid, the foamy liquid is ejected through the nozzle hole 21 of the pressing head 20. The pressing head 20 is pushed down until the lower surface of the protruding portion 11 abuts the opening peripheral edge of the liquid cylinder 16 on the bottom surface in the air cylinder 15.
Thereafter, when the depression of the pressing head 20 is released, the pressing head 20, the stem 10, and the first piston member 40 and the second piston member 50 linked to the stem 10 are in an upward biased state by the elastic restoring force of the coil spring 4. Will return.

  As described above, according to the dispenser 1 according to the present embodiment, the first piston member 40 slides on the inner surface of the first piston main body 41 and the air cylinder 15 and the inner peripheral surface on the lower end side of the fitting cylinder portion 22. The first sliding contact portion 46 is made of a soft material having a lower hardness than the first piston main body 41, and the second piston member 50 is a second piston. Since the second sliding contact portion 56 has a main body 51 and a second sliding contact portion 56 that is in sliding contact with the inner surface of the liquid cylinder 16, the second sliding contact portion 56 is made of a soft material having a lower hardness than the second piston main body 51. When the stem 10 and the pressing head 20 are pressed, the first sliding contact portion 46 and the second sliding contact portion 56 are elastically deformed, so that the air tightness with the air cylinder 15 and the liquid tightness with the liquid cylinder 16 are reached. Stem 10 with a small force while maintaining It is possible to push down the lower head 20.

  Moreover, in this embodiment, since the 1st piston main body 41 and the 1st sliding contact part 46 and the 2nd piston main body 51 and the 2nd sliding contact part 56 are integrally molded by insert molding, it is the same as the past. Assembling the first piston member 40 and the second piston member 50 together makes it possible to manufacture the discharge device 1 according to this embodiment. Further, by adjusting the arrangement of the mold when the first piston main body 41 is molded, the communication hole portion 43 can be provided in the communication groove portion 42 through which the soft material forming the first sliding contact portion 46 flows, so that the dimension is stable. The 1st piston member 40 excellent in property can be produced comparatively easily.

The foam discharge container according to one embodiment of the present invention has been described above, but the technical scope of the present invention is not limited to this, and can be changed as appropriate without departing from the technical idea of the present invention. .
For example, the second piston member that slides in the liquid cylinder has been described as one in which the second piston main body and the second sliding contact portion are integrally formed. However, the present invention is not limited to this, and FIG. As shown, the second piston member 70 may be configured by disposing a sliding contact member 76 made of a soft material on the outer peripheral side of the second piston main body 71. In the second piston member 70 shown in FIG. 6, the second piston main body 71 has a small diameter cylindrical portion 77 and a large diameter cylindrical portion 78, and the large diameter cylindrical portion is formed on the outer peripheral surface of the small diameter cylindrical portion 77. An annular protrusion 79 projecting radially outward with a space from 78 is provided, and a sliding contact member 76 is attached to an annular groove defined between the annular protrusion 79 and the large diameter cylindrical portion 78. Yes.

Moreover, although demonstrated as what integrally formed the 1st piston main body and the 1st sliding contact part, and the 2nd piston main body and the 2nd sliding contact part by insert molding, it is not limited to this, 1st After the resin material forming the second piston body is injected into the mold, the position of the mold is moved to inject a soft material that forms the first and second sliding contact portions, so-called two-layer molding. The 1 piston main body and the first sliding contact portion, and the second piston main body and the second sliding contact portion may be integrally formed.
Furthermore, the soft material that forms the first and second sliding contact portions may be injected first, and then the resin material that forms the first and second piston bodies may be injected.

A discharger that can press the pressing head and stem with a small force, and can prevent air pressure and liquid tightness from being lowered by preventing the pressure contact between the piston member and the cylinder linked to the pressing head and the cylinder. I will provide a.
Further, the present invention provides a piston member that is used in various types of dispensers and has good sliding characteristics without causing an increase in assembly process.

In the discharge device shown as one embodiment concerning the present invention, it is a longitudinal section showing the state where the stem and pressing head were urged upwards. FIG. 2 is a side view of a first piston member that slides in an air cylinder in the discharge device shown in FIG. 1. It is a top view of the 1st piston member shown in FIG. It is XX sectional drawing in FIG. FIG. 2 is a longitudinal sectional view of a second piston member that slides in a liquid cylinder in the discharger shown in FIG. 1. FIG. 6 is a longitudinal sectional view showing a state in which a stem and a pressing head are urged upward in a discharge device which is another embodiment according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Discharger 2 Gas-liquid mixing chamber 10 Stem 15 Air cylinder 16 Liquid cylinder 20 Press head 21 Nozzle hole 30 Mounting part 31 Insertion hole 40 1st piston member 41 1st piston main body 46 1st sliding contact part 50 2nd piston Member 51 Second piston main body 56 Second sliding contact portion 60 Foaming member 70 Second piston member 71 Second piston main body 76 Sliding contact member (second sliding contact portion)

Claims (4)

A stem erected in an upward biased state at the mouth of the container body;
A pressing head attached to the upper end of the stem and formed with a nozzle hole;
The stem includes an insertion hole that is inserted in a vertically movable manner, and a mounting portion that is mounted on the mouth of the container body;
An air cylinder in which a first piston member linked to the pressing head and the stem slides in the vertical direction;
A liquid cylinder in which a second piston member linked to the pressing head and the stem slides in the vertical direction;
A gas-liquid mixing chamber in which the air from the air cylinder and the liquid from the liquid cylinder merge;
A foaming member installed between the nozzle hole and the gas-liquid mixing chamber,
By pressing down the pressing head while being attached to the mouth of the container body and pressurizing the air in the air cylinder and the liquid in the liquid cylinder, these air and liquid are transferred to the gas-liquid mixing chamber. A discharge device configured to join and foam through a foam member and discharge from the nozzle hole,
The first piston member has a first piston main body and a first sliding contact portion that is in sliding contact with the inner surface of the air cylinder, and the first sliding contact portion is a soft material having a hardness lower than that of the first piston main body. Composed of materials,
The second piston member has a second piston main body and a second sliding contact portion that is in sliding contact with the inner surface of the liquid cylinder, and the second sliding contact portion is a soft material having a hardness lower than that of the second piston main body. Composed of wood ,
The first piston member that slides in the air cylinder has a structure in which a first piston body and a first sliding contact portion, each formed of a resin material, are integrally formed . . The dispenser according to claim 1 , wherein
The second piston member that slides in the liquid cylinder has a structure in which a second piston body and a second sliding contact portion each formed of a resin material are integrally formed. . A piston member that slides inside the cylinder,
A piston main body made of a resin material, and a sliding contact portion that is located at the outer peripheral ends of the upper and lower portions of the piston main body and is in sliding contact with the inner surface of the cylinder,
The sliding contact portion is formed of a soft material having a lower hardness than the resin material forming the piston main body, and the piston main body and the sliding contact portion are integrally formed.
At least a part of the piston body in the circumferential direction is formed with a slidable contact portion positioned at the upper portion of the piston main body and a connecting groove portion connected to the slidable contact portion positioned at the lower portion. The connecting groove portion is formed of the soft material. A piston member having a band-shaped portion formed thereon. The piston member according to claim 3 ,
A piston member characterized in that a communication hole portion penetrating a part of the piston body is formed in at least a part of the communication groove portion.

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