Discharge container

Abstract

The present invention provides a dispensing container that can be configured by adapting a dispensing unit, which is designed to fit a narrow-mouthed container body, to a wide-mouthed container body. [Solution] A discharge container 1 comprising a container body 3 and a discharger 2, wherein the discharger 2 comprises a cylinder member 5 having a cylinder portion 5a, a sliding member 6 that slides within the cylinder portion 5a, a holding member 7 having a discharge port 8a and performing an upward and downward movement relative to the cylinder portion 5a in response to operation, an internal flow path 8 that sends the contents 4 to the discharge port 8a and discharges them in response to the upward and downward movement of the holding member 7, a mounting cap 9, a cylinder receiving member 10 that receives and holds the cylinder member 5 from below, and an outside air introduction path 20 that introduces outside air into the container body 3 in response to the upward and downward movement of the holding member 7.

Description

Technical Field

[0001] The present invention relates to a discharge container.

Background Art

[0002] There is known a discharge container constituted by a container body having a narrow mouth portion and a discharger attached to the mouth portion for discharging the contents in the container body to the outside according to an operation (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to provide a discharge container in which a discharger adapted to a narrow - mouthed container body can be configured to be adapted to a wide - mouthed container body.

Means for Solving the Problems

[0005] [[ID=​​​​​​​​​​​​​​An internal flow path that sends the contents to the discharge port and discharges them through a pump chamber partitioned by the cylinder portion and the sliding member in accordance with the upward and downward movement of the holding member, A mounting cylinder that is attached to the opening and a mounting cap having a cap top wall connected to the upper end of the mounting cylinder, A cylinder support member that receives and holds the cylinder member from below, having cylindrical wall portions that are in close contact with the outer circumferential surface of the cylinder portion at the upper and lower sides of the vent that penetrates the cylinder portion, and an extension portion that is connected to the upper end of the cylindrical wall portion and is sandwiched and held between the upper end surface of the opening and the top wall of the cap, A discharge container having the vents of the cylinder portion, the gap between the outer surface of the cylinder portion and the cylindrical wall portion, and the through-hole that penetrates the cylindrical wall portion, and an outside air introduction path that introduces outside air into the container body in accordance with the raising and lowering movement of the holding member.

[0007] [2] The container body is formed by extrusion blow molding, as described in [1].

[0008] [3] The valve member has a valve support portion held by the cylinder receiving member, and an outside air intake valve member having an outside air intake valve portion connected to the valve support portion. The cylinder receiving member has a seating portion on which the outside air intake valve body is seated, The discharge container according to [1] or [2], wherein the outside air intake valve body prevents the contents from leaking into the outside air intake path when discharged in an inverted position by seating on the seating portion, and allows the outside air to be introduced into the container body by separating from the seating portion when outside air is introduced through the outside air intake path.

[0009] [4] The extension of the cylinder receiving member has an annular stepped wall extending radially outward from the upper end of the cylindrical wall along the flange, an upper cylindrical wall extending upward from the outer peripheral edge of the stepped wall, and a flange wall extending radially outward from the upper end of the upper cylindrical wall and sandwiched between the upper end surface of the opening and the cap top wall. The valve support portion is cylindrical, and at the lower end of the valve support portion, it is in close contact with the outer circumferential surface of the cylindrical wall portion below the through-hole. The outside air intake valve body has an annular shape that extends radially outward from the upper end of the valve body support portion. The discharge container according to [3], wherein the lower surface of the stepped wall has a seating portion and an annular projection that protrudes radially outward from the seating portion and below the outer peripheral edge of the outside air intake valve body. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a dispensing container in which a dispensing device that fits a narrow-mouthed container body can be adapted to a wide-mouthed container body. [Brief explanation of the drawing]

[0011] [Figure 1] This is a cross-sectional view showing the dispensing container of one embodiment of the present invention in its state before use. [Figure 2] Figure 1 is a cross-sectional view showing the state of the discharge container during discharge. [Figure 3] This is an enlarged view of section A in Figure 2. [Modes for carrying out the invention]

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0013] As shown in Figure 1, in one embodiment of the present invention, the dispensing container 1 has a dispenser 2 and a container body 3. The container body 3 has a mouth 3a, a body 3b, and a bottom 3c connected in that order, and contains contents 4. The contents 4 are not particularly limited and are, for example, cosmetics such as lotion, antiperspirant, or sunscreen, and in this embodiment they are liquids. The dispenser 2 is attached to the mouth 3a and dispenses the contents 4 from the container body 3 to the outside according to operation.

[0014] The container body 3 is formed by extrusion blow molding (EBM) in which a tubular parison is sandwiched between molds and air is blown into it to form a predetermined shape. The material of the container body 3 is, for example, polyethylene (PE), polypropylene (PP), or the like.

[0015] In this embodiment, the direction along the central axis O is referred to as the vertical direction, the direction from the cylinder part 5a side toward the discharge port 8a side (from the bottom part 3c side of the container body 3 toward the mouth part 3a side) along the vertical direction is referred to as the upward direction, the opposite direction is referred to as the downward direction, the direction orthogonal to the central axis O is referred to as the radial direction, and the direction around the central axis O is referred to as the circumferential direction.

[0016] As shown in FIGS. 1 to 2, the discharger 2 includes a cylindrical cylinder part 5a centered on the central axis O and a cylinder member 5 having a flange part 5b extending radially outward from the upper end part of the cylinder part 5a, a sliding member 6 sliding inside the cylinder part 5a, a holding member 7 having a discharge port 8a and performing a lifting and lowering operation with respect to the cylinder part 5a along with the sliding member 6 according to an operation, and an internal flow path 8 that feeds and discharges the content 4 to the discharge port 8a according to the lifting and lowering operation of the holding member 7 through a pump chamber 8b defined by the cylinder part 5a and the sliding member 6.

[0017] Further, the discharger 2 includes a mounting cap 9 having a mounting cylinder 9a mounted on the mouth part 3a and a cap top wall 9b continuous with the upper end part of the mounting cylinder 9a, and a cylinder receiving member 10 that receives and holds the cylinder member 5 from below. The cylinder receiving member 10 includes a cylindrical wall part 10a having an upper seal part 10a1 above and a lower seal part 10a2 below a vent hole 20a penetrating the cylinder part 5a, and an extension part 10b continuous with the upper end of the cylindrical wall part 10a and held sandwiched between the upper end surface of the mouth part 3a and the cap top wall 9b. The cylindrical wall part 10a is in close contact with the outer peripheral surface of the cylinder part 5a at the upper seal part 10a1 and the lower seal part 10a2, respectively.

[0018] The upper end of the outer circumferential surface of the cylinder portion 5a has an annular projection 5a1 that extends circumferentially from the lower surface of the flange portion 5b at a distance, and the upper sealing portion 10a1 of the cylindrical wall portion 10a is in close contact with the annular projection 5a1, thereby making close contact with the outer circumferential surface of the cylinder portion 5a.

[0019] The extension 10b of the cylinder receiving member 10 has an annular stepped wall 10b1 extending radially outward from the upper end of the cylindrical wall portion 10a along the flange portion 5b, an upper cylindrical wall 10b2 extending upward from the outer peripheral edge of the stepped wall 10b1, and a flange wall 10b3 extending radially outward from the upper end of the upper cylindrical wall 10b2 and sandwiched between the upper end surface of the mouth portion 3a and the cap top wall 9b. An annular packing 11 is attached to the lower surface of the flange wall 10b3 and sandwiched between the lower surface of the flange wall 10b3 and the upper end surface of the mouth portion 3a.

[0020] The cylinder member 5 has a reduced-diameter portion 5c extending radially inward from the lower end of the cylinder portion 5a, a connecting cylinder portion 5d extending downward from the inner periphery of the reduced-diameter portion 5c, and a valve receiving portion 5e extending radially inward from the connecting cylinder portion 5d to form the pump chamber suction port 8c. The valve receiving portion 5e is provided with a movable valve 12 that is held to move vertically within the pump chamber suction port 8c. The movable valve 12 closes the pump chamber suction port 8c by descending and seating on the valve receiving portion 5e by its own weight, and opens the pump chamber suction port 8c by rising and releasing the seat. Note that the arrangement of the valve receiving portion 5e and the movable valve 12 is not limited to this. A suction valve of a type other than the movable valve 12 may be provided.

[0021] In this embodiment, a dual-purpose unit 13 for both upright and inverted positions is attached to the connecting cylinder portion 5d so that continuous discharge is possible even in an inverted position. The dual-purpose unit 13 has a lower suction port 8d and an upper suction port 8e located above the lower suction port 8d. In the upright position (position shown in Figures 1-2), the contents 4 inside the container body 3 are flowed from the lower suction port 8d, which serves as the entrance to the internal flow path 8, towards the pump chamber suction port 8c by the raising and lowering movement of the holding member 7. In the inverted position (not shown), the contents 4 inside the container body 3 are flowed from the upper suction port 8e, which serves as the entrance to the internal flow path 8, towards the pump chamber suction port 8c by the raising and lowering movement of the holding member 7.

[0022] The cylinder support member 10 has an annular diameter-reducing wall 10c that extends radially inward from the lower end of the cylindrical wall portion 10a along the lower surface of the diameter-reducing portion 5c of the cylinder member 5. In this embodiment, the cylinder support member 10 supports and holds the cylinder member 5 from below by supporting the flange portion 5b of the cylinder member 5 from below with the stepped wall 10b1, but it is not limited to this configuration, and the cylinder member 5 may also be supported and held from below by supporting the diameter-reducing wall 10c of the diameter-reducing portion 5c of the cylinder member 5 from below.

[0023] The discharger 2 has a retaining member 14 attached to the upper end of the cylinder portion 5a that restricts the sliding member 6 from coming out upward from inside the cylinder portion 5a. The retaining member 14 has an annular retaining portion 14a that fits onto the inner circumferential surface of the cylinder portion 5a, and a projection 14b that extends radially outward from the outer circumferential surface of the retaining portion 14a and is supported from below by the flange portion 5b. The mounting cap 9 has a double-walled inner cylinder portion 9c that extends downward from the inner circumferential edge of the cap top wall 9b along the inner circumferential surface of the upper cylinder wall 10b2 of the cylinder receiving member 10 and supports the flange portion 5b from above, an annular wall 9d that extends radially inward from the lower end of the inner cylinder portion 9c and supports the projection 14b from above, and a guide cylinder 9e that extends upward from the inner circumferential edge of the annular wall 9d.

[0024] The holding member 7 has a finger-type pressing head 7a that has a discharge port 8a and is subjected to downward pressure by a finger. The pressing head 7a has a head body 7a1 having a discharge port 8a, and a guided cylinder 7a2 that extends downward from the head body 7a1 and moves up and down between the outer circumferential surface of the guide cylinder 9e and the inner circumferential surface of the inner cylinder portion 9c of the mounting cap 9 during operation. Note that the pressing head 7a is not limited to a finger type. Also, the holding member 7 is not limited to a configuration that has a pressing head 7a.

[0025] The discharger 2 has a retaining member biasing part 15, which is made of a spring and provides a biasing force to raise the retaining member 7 relative to the cylinder part 5a. The lower end of the retaining member biasing part 15 is supported from below by a retaining member 14. In other words, the retaining member 7 performs a lifting and lowering operation by pushing down the push head 7a against the biasing force of the retaining member biasing part 15, and by releasing the operation, it rises due to the biasing force of the retaining member biasing part 15.

[0026] In this embodiment, the discharger 2 is of the accumulating type. Therefore, the discharger 2 has an accumulating cylinder section 16 having a smaller cross-sectional area than the cylinder section 5a, an accumulating sliding member 17 that slides inside the accumulating cylinder section 16, a connecting section 18 that connects the holding member 7 to the accumulating cylinder section 16 such that, upon operation, the holding member 7 descends relative to the accumulating cylinder section 16 together with the accumulating sliding member 17, then descends relative to the cylinder section 5a together with the accumulating cylinder section 16 and the sliding member 6, and then rises relative to the accumulating cylinder section 16, and then rises relative to the cylinder section 5a together with the accumulating cylinder section 16 and the sliding member 6, and an accumulating opening / closing section 19 that opens the internal passage 8 when the internal pressure of the pump chamber 8b increases due to the downward movement of the accumulating sliding member 17 relative to the accumulating cylinder section 16, and closes when the internal pressure of the pump chamber 8b decreases due to the upward movement of the accumulating sliding member 17 relative to the accumulating cylinder section 16. Furthermore, the pump chamber 8b is partitioned by the pressure accumulating cylinder section 16, the pressure accumulating sliding member 17, the cylinder section 5a, and the sliding member 6.

[0027] In this embodiment, the pressure accumulation opening / closing section 19 is composed of a pressure accumulation sliding member 17, a pressure accumulation biasing section 19a consisting of a spring that biases the pressure accumulation sliding member 17 downward, and a pressure accumulation seating section 19b of the holding member 7 on which the pressure accumulation sliding member 17 sits. The pressure accumulation sliding member 17 opens the pressure accumulation opening / closing section 19 by rising against the biasing force from the pressure accumulation biasing section 19a due to the increase in internal pressure in the pump chamber 8b, thereby separating from the pressure accumulation seating section 19b. However, the configuration of the pressure accumulation opening / closing section 19 is not limited to this.

[0028] The discharger 2 has an outside air introduction path 20 that introduces outside air into the container body 3 as shown by the dashed arrow in Figures 2-3 when the contents 4 are discharged and negative pressure is created inside the container body 3 in accordance with the raising and lowering movement of the holding member 7. The outside air introduction path 20 has a gap between the outer circumferential surface of the guide tube 9e of the mounting cap 9 and the inner cylinder portion 9c, a gap between the inner circumferential surface of the inner cylinder portion 9c and the holding member 7, a gap between the inner circumferential surface of the retaining member 14 and the pressure accumulation cylinder portion 16, a vent 20a of the cylinder portion 5a, a gap between the outer circumferential surface of the cylinder portion 5a and the cylindrical wall portion 10a, and a through-hole 20b that penetrates the cylindrical wall portion 10a.

[0029] In the initial state before the holding member 7 is operated, the outside air intake path 20 is blocked when the sliding member 6 closes the vent 20a (see Figure 1). When the holding member 7 is operated and lowered, the sliding member 6 opens the vent 20a, releasing the blockage of the outside air intake path 20 (see Figure 2).

[0030] The discharger 2 has an outside air intake valve member 21 having a valve body support portion 21a held by the cylinder receiving member 10, and an outside air intake valve body 21b connected to the valve body support portion 21a. The cylinder receiving member 10 has a seating portion 10b4 on which the outside air intake valve body 21b is seated. The outside air intake valve body 21b prevents the contents 4 from leaking into the outside air intake path 20 when discharged in an inverted position by seating on the seating portion 10b4, and allows outside air to be introduced into the container body 3 by separating from the seating portion 10b4 when outside air is introduced through the outside air intake path 20.

[0031] The valve support portion 21a is cylindrical and is in close contact with the outer circumferential surface of the cylindrical wall portion 10a below the through-hole 20b at its lower end, and the outside air intake valve body 21b is annular in shape and extends radially outward from the upper end of the valve support portion 21a. The lower surface of the stepped wall 10b1 has a seating portion 10b4 and an annular projection 10b5 that extends radially outward from the seating portion 10b4 and below the outer circumferential edge of the outside air intake valve body 21b.

[0032] The outside air intake valve body 21b can be formed from a soft resin such as LLDPE (linear low-density polyethylene), or from an elastomer or rubber. The cylinder member 5 and the cylinder support member 10 can be formed from a resin such as PP (polypropylene) or PE (polyethylene).

[0033] The discharger 2 has an overcap 22 that exposes the push head 7a when removed from the mounting cap 9, but is not limited to this.

[0034] According to this embodiment, by gripping the container body 3 or the attached cap 9 and pressing down the push head 7a with a finger, the holding member 7 is lowered, sending the contents 4 in the pump chamber 8b to the discharge port 8a for discharge. In this case, first, the holding member 7, along with the pressure accumulating sliding member 17, descends relative to the pressure accumulating cylinder 16, increasing the internal pressure of the pump chamber 8b. As a result, the pressure accumulating opening / closing section 19 opens, and the increased internal pressure of the pump chamber 8b allows the contents 4 to be discharged forcefully to the outside. Further operation causes the holding member 7, along with the pressure accumulating cylinder 16 and the sliding member 6, to descend relative to the cylinder 5a. The increased internal pressure of the pump chamber 8b keeps the pressure accumulating opening / closing section 19 open, allowing the forceful discharge of the contents 4 to continue. Once the discharge of the contents 4 is complete, the pressure accumulating opening / closing section 19 closes due to the decrease in internal pressure of the pump chamber 8b.

[0035] Furthermore, releasing the operation causes the holding member 7 to rise due to the biasing force of the holding member biasing part 15, thereby lowering the internal pressure of the pump chamber 8b and allowing the contents 4 to be sucked from the container body 3 into the pump chamber 8b.

[0036] Thus, during operation, pressure is first accumulated by the pressure accumulation cylinder section 16 and pressure accumulation sliding member 17 on the side with the smaller cross-sectional area, enabling the discharge of the contents 4 with good force from the start with light operation. Furthermore, since the subsequent discharge utilizes the cylinder section 5a and sliding member 6 on the side with the larger cross-sectional area, it is possible to suppress the length of the cylinder stroke even when designed to obtain a large discharge volume.

[0037] When the contents 4 are discharged, negative pressure is created inside the container body 3. As a result, outside air is introduced into the container body 3 through the outside air introduction path 20, reducing the negative pressure inside the container body 3. Furthermore, when discharging in an inverted position, the outside air introduction valve member 21 prevents the contents 4 from entering the outside air introduction path 20 from inside the container body 3 and leaking out to the outside of the discharge container 1.

[0038] In particular, in this embodiment, the cylinder member 5, which is suitable for a narrow-mouthed container body 3 with a narrow opening 3a, is made suitable for a wide-mouthed container body 3 with a wider opening 3a by utilizing the cylinder receiving member 10 and a mounting cap 9 that fits it. Therefore, most of the dispenser 2 can be used for both narrow-mouthed and wide-mouthed container bodies 3, thus reducing costs.

[0039] When applied to a narrow opening, a mounting cap 9 (not shown) for narrow openings can be used to hold the flange portion 5b of the cylinder member 5, together with an annular packing 11 (not shown) attached to the lower surface of the flange portion 5b, between the upper end surface of the opening 3a and the mounting cap 9. In this case, the packing 11 is attached to the lower surface of the flange portion 5b by fitting its inner peripheral edge onto the annular projection 5a1 on the outer peripheral surface of the cylinder portion 5a.

[0040] When applied to a wide opening using the cylinder receiving member 10, the extension 10b of the cylinder receiving member 10 causes the cylinder member 5 to be positioned to extend downward from the opening 3a. This suppresses the protrusion height of the push head 7a from the opening 3a, making it easier to apply force when operating the push head 7a with a finger, thus simplifying operation.

[0041] Furthermore, when the container body 3 is formed by extrusion blow molding, the shape stability of the inner circumferential surface of the opening 3a is inferior to that when it is formed by biaxial stretch blow molding. Therefore, in an inner seal system in which a sealing cylinder that closely contacts the inner circumferential surface of the opening 3a is provided on the mounting cap 9, it is difficult to achieve a stable seal of the opening 3a. However, in this embodiment, the flange wall 10b3 of the cylinder receiving member 10 and the packing 11 placed on its lower surface are sandwiched between the upper end surface of the opening 3a and the cap top wall 9b, thereby sealing the opening 3a and achieving a stable seal.

[0042] Furthermore, in this embodiment, since the cylinder receiving member 10 has an annular projection 10b5, when the discharger 2 is placed on its side before being mounted on the wide-mouthed container body 3, the annular projection 10b5 protects the outer peripheral edge of the outside air intake valve body 21b from colliding with an external object and being damaged, by surrounding the outer peripheral edge from the radially outside.

[0043] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and the embodiments described above can be modified in various ways without departing from the spirit of the present invention.

[0044] For example, in the embodiment described above, a unit 13 that can be used both upright and inverted is provided, but the invention is not limited to this. For example, the upper end of the suction pipe may be connected to the connecting cylinder portion 5d of the cylinder member 5, and the contents 4 may be sucked in from the lower end of the suction pipe and sent to the pump chamber 8b.

[0045] Furthermore, although an outside air introduction valve member 21 is provided in the embodiment described above, the invention is not limited to this. The container body 3 is not limited to extrusion blow molding, but may also be formed by, for example, biaxial stretch blow molding, in which a bottomed cylindrical preform is set in a mold and air is blown in to form a predetermined shape. [Explanation of Symbols]

[0046] 1 Discharge container 2 Dispenser 3. Container body 3a Mouth 3b Torso 3c bottom 4 Contents 5 Cylinder Member 5a Cylinder section 5a1 Annular projection 5b Flange section 5c Reduced diameter part 5d Connecting cylinder 5e Valve receiving section 6. Sliding member 7 Retaining member 7a Press head 7a1 Head Body 7a2 Guided tube 8 Internal flow channels 8a Discharge port 8b Pump Room 8c Pump room suction port 8d Lower intake port 8e Upper suction port 9. Mounting cap 9a Mounting tube 9b Cap top wall 9c Inner cylinder part 9d Ring Wall 9e Guide tube 10 Cylinder support member 10a Cylindrical wall portion 10a1 Upper sealing portion 10a2 Lower seal section 10b Extension 10b1 Step wall 10b2 Upper cylindrical wall 10b3 Flange wall 10b4 Seating area 10b5 Annular protrusion 10c reduced diameter wall 11 Gasket 12. Mobile valve 13. Upright and inverted unit 14 Retaining member 14a Retaining part 14b Protrusion 15. Holding member biasing part 16. Pressure Accumulator Cylinder Section 17. Pressure-accumulating sliding member 18 Connection part 19. Pressure accumulation switch 19a Pressure accumulation biasing section 19b Pressure accumulation seating section 20. Outside air intake path 20a Ventilation opening 20b Through hole 21. Outside air intake valve component 21a Valve support 21b Outside air intake valve 22 Overcap O center axis

Claims

1. A dispensing container comprising a container body having an opening, and a dispensing device attached to the opening that dispenses the contents of the container body to the outside in accordance with the operation, wherein the dispensing device is A cylinder member having a cylinder portion and a flange portion extending radially outward from the upper end of the cylinder portion, A sliding member that slides within the cylinder portion, A holding member having a discharge port and performing a lifting and lowering motion relative to the cylinder portion in accordance with the operation, An internal flow path that sends the contents to the discharge port and discharges them through a pump chamber partitioned by the cylinder portion and the sliding member in accordance with the upward and downward movement of the holding member, A mounting cylinder that is attached to the opening and a mounting cap having a cap top wall connected to the upper end of the mounting cylinder, A cylinder support member that receives and holds the cylinder member from below, having cylindrical wall portions that are in close contact with the outer circumferential surface of the cylinder portion at the upper and lower sides of the vent that penetrates the cylinder portion, and an extension portion that is connected to the upper end of the cylindrical wall portion and is sandwiched and held between the upper end surface of the opening and the top wall of the cap, A discharge container having the vents of the cylinder portion, the gap between the outer surface of the cylinder portion and the cylindrical wall portion, and the through-hole that penetrates the cylindrical wall portion, and an outside air introduction path that introduces outside air into the container body in accordance with the raising and lowering movement of the holding member.

2. The discharge container according to claim 1, wherein the container body is formed by extrusion blow molding.

3. The valve member has a valve support portion held by the cylinder receiving member, and an outside air intake valve member having an outside air intake valve portion connected to the valve support portion. The cylinder receiving member has a seating portion on which the outside air intake valve body is seated, The discharge container according to claim 1, wherein the outside air intake valve body prevents the contents from leaking into the outside air intake path when discharged in an inverted position by seating on the seating portion, and allows the outside air to be introduced into the container body by separating from the seating portion when outside air is introduced through the outside air intake path.

4. The extension of the cylinder receiving member has an annular stepped wall extending radially outward from the upper end of the cylindrical wall along the flange, an upper cylindrical wall extending upward from the outer peripheral edge of the stepped wall, and a flange wall extending radially outward from the upper end of the upper cylindrical wall and sandwiched between the upper end surface of the opening and the cap top wall. The valve support portion is cylindrical, and at the lower end of the valve support portion, it is in close contact with the outer circumferential surface of the cylindrical wall portion below the through-hole. The outside air intake valve body has an annular shape that extends radially outward from the upper end of the valve body support portion. The discharge container according to claim 3, wherein the lower surface of the stepped wall has a seating portion and an annular projection that protrudes radially outward from the seating portion and below the outer peripheral edge of the outside air intake valve body.

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