Discharge pump

Abstract

To achieve low cost of a discharge pump.SOLUTION: A coil spring 12 is formed in an open-end shape where a metal wire material is wound in a state of providing a gap in the vertical direction across the whole area. An upper side support part 27a for supporting an upper end part of the coil spring faces downward, extends continuously across the whole circumference, and includes an upper support surface 32 with which an upper end edge of the coil spring comes into contact, and an upper cylinder 33 for supporting an inner peripheral surface of the upper end part of the coil spring. A lower side support part 41 for supporting a lower end part of the coil spring faces upward, extends continuously across the whole circumference and includes a lower support surface 41a with which a lower end edge of the coil spring comes into contact, and a lower cylinder 45 for supporting an inner peripheral surface of the lower end part of the coil spring.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a discharge pump. [Background technology]

[0002] Conventionally, as shown in Patent Document 1 below, for example, there has been known a discharge pump that includes a cylinder that extends vertically and is inserted into a container body that contains contents, a coil spring provided within the cylinder, a stem that extends vertically and is supported by the coil spring in an upwardly biased state so that it can move downward, a piston that is fitted within the cylinder so as to be able to slide vertically and that is linked to the vertical movement of the stem, and a discharge head that is attached to the upper end of the stem and has a discharge hole for the contents formed therein. Coil springs used in discharge pumps are generally formed in a closed-end shape with end turns at both vertical ends, which allows the coil spring to be compressed and deformed stably in the vertical direction without tilting when a vertical compressive force is applied to the coil spring. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-213362 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in recent years, material costs have risen sharply, and there is an increasing demand for lower costs of discharge pumps.

[0005] The present invention provides a discharge pump that is low in cost. [Means for solving the problem]

[0006] a piston fitted within the cylinder so as to be able to slide vertically and which is linked to the up and down movement of the stem; and a discharge head attached to the upper end of the stem and having a discharge hole for the contents; wherein the coil spring is formed in an open-end shape in which metal wire is wound with a vertical gap provided over the entire area; an upper support part supporting the upper end of the coil spring faces downward and extends continuously around the entire circumference, and comprises an upper support surface against which the upper edge of the coil spring abuts, and an upper cylinder supporting the inner surface of the upper end of the coil spring; and a lower support part supporting the lower end of the coil spring faces upward and extends continuously around the entire circumference, and comprises a lower support surface against which the lower edge of the coil spring abuts, and a lower cylinder supporting the inner surface of the lower end of the coil spring.

[0007] Since the coil spring is formed in an open-end shape in which the metal wire is wound with gaps in the vertical direction over the entire area, the manufacturing labor required for the end turn and the amount of metal material used can be reduced compared to a closed-end shape in which end turn portions are provided at both ends in the vertical direction, thereby reducing the cost of the discharge pump. The upper support portion that supports the upper end of the coil spring has an upper support surface that faces downward and extends continuously around the entire circumference, and the lower support portion that supports the lower end of the coil spring has a lower support surface that faces upward and extends continuously around the entire circumference.Therefore, it is possible to prevent the upper end of the metal wire that forms part of the upper end of the coil spring from penetrating upward into the non-formed part of the upper support surface and damaging other parts, or the lower end of the metal wire that forms part of the lower end of the coil spring from penetrating downward into the non-formed part of the lower support surface and damaging other parts, as would be the case, for example, if the upper support surface and the lower support surface were arranged intermittently around the circumference. The upper support portion is provided with an upper tube that supports the inner surface of the upper end of the coil spring, and the lower support portion is provided with a lower tube that supports the inner surface of the lower end of the coil spring.Therefore, when an upward or downward compressive force is applied to the coil spring, the upper tube can support the inner surface of the upper end of the coil spring, and the lower tube can support the inner surface of the lower end of the coil spring.This means that even coil springs formed in an open-end shape can be stably compressed and deformed in the upward and downward directions without tilting.

[0008] A holding member is provided to which the discharge head, which is located at the lowermost position, is screwed, and when viewed from above, the loosening direction of the discharge head relative to the holding member around the pump shaft coincides with the top-to-bottom direction of the winding direction in which the metal wire is wound in a coil shape around the pump shaft, and the upper support part is provided in a state in which rotational movement around the pump shaft relative to the discharge head is restricted, and the upper support part is provided with an upper support surface that faces the loosening direction and abuts against the upper end surface of the metal wire that constitutes part of the upper end of the coil spring, and the lower support part is provided with a lower support surface that faces in the tightening direction opposite to the loosening direction and abuts against the lower end surface of the metal wire that constitutes part of the lower end of the coil spring, and a communication hole that opens in the vertical direction and communicates with the inside of the container body is formed at the lower end of the cylinder, and the lower support part may be provided with a valve body that is arranged on the inner surface of the cylinder so as to be able to move upward relative to the opening periphery of the communication hole.

[0009] When the discharge head is rotated together with the upper support part relative to the holding member in the loosening direction to release the screw connection between the discharge head and the holding member, the upper support surface of the upper support part abuts against the upper end surface of the metal wire in the loosening direction, and the lower end surface of the metal wire abuts against the lower support surface of the lower support part in the loosening direction. As a result, the lower support part rotates in the loosening direction relative to the cylinder, and the valve element rotates in the loosening direction relative to the opening periphery of the communicating hole on the inner surface of the cylinder, so that even if the valve element has stuck to the opening periphery of the communicating hole on the inner surface of the cylinder, this sticking can be released.

[0010] The upper support surface may have an upper inclined portion that protrudes downward more as it approaches the loosening direction, and the end face of the upper inclined portion in the loosening direction may be the upper support surface, and the lower support surface may have a lower inclined portion that protrudes upward more as it approaches the tightening direction, and the end face of the lower inclined portion in the tightening direction may be the lower support surface.

[0011] An upper inclined portion having an upper receiving surface is formed on the upper support surface, and a lower inclined portion having a lower receiving surface is formed on the lower support surface.As a result, when the ejection head is pressed down and rotated in the tightening direction relative to the holding member, the lower surface of the upper inclined portion slides over the upper end of the coil spring in the tightening direction, and the lower end of the coil spring slides over the upper surface of the lower inclined portion in the tightening direction, so that the ejection head, which is positioned at the lower end position, can be easily screwed onto the holding member. [Effects of the Invention]

[0012] According to the present invention, the cost of the discharge pump can be reduced. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a longitudinal cross-sectional view including a partial side view of a discharge pump shown as an embodiment. [Figure 2] 2 is a diagram showing a state in which the discharge head of the discharge pump of FIG. 1 is screwed onto a holding member. FIG. [Figure 3] 2 is a bottom view of the main body (upper support part) of FIG. 1. FIG. [Figure 4] FIG. 2 is a half-longitudinal cross-sectional view of the lower support part of FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the discharge pump 1 according to this embodiment includes a cylinder 11, a coil spring 12, a stem 13, a piston 14, and a discharge head 15. The cylinder 11, coil spring 12, stem 13, piston 14, and discharge head 15 are each formed in a cylindrical shape, and these 11 to 15 are arranged coaxially on a common axis. Hereinafter, this common axis will be referred to as the pump axis O, the discharge head 15 side along the pump axis O will be referred to as the upper side, the cylinder 11 side along the pump axis O will be referred to as the lower side, and the direction along the pump axis O will be referred to as the up-down direction. The direction intersecting the pump axis O as viewed from the up-down direction will be referred to as the radial direction, and the direction going around the pump axis O as viewed from the up-down direction will be referred to as the circumferential direction.

[0015] The discharge pump 1 is provided with a cylindrical mounting cap 17 with a top that is disposed coaxially with the pump axis O. The mounting cap 17 is screwed onto the opening of the container body that contains the contents, thereby fixing the discharge pump 1 to the container body.

[0016] The cylinder 11 is formed in a cylindrical shape extending in the vertical direction and is inserted into the container body. A flange 18 projects radially outward from the entire circumference of the upper part of the cylinder 11, and an annular packing 19 is fitted around the bottom surface of the flange 18. When the discharge pump 1 is fixed to the container body by the attachment cap 17, the flange 18 and packing 19 are sandwiched vertically between the top wall 17a of the attachment cap 17 and the upper opening edge of the mouth of the container body. The upper end 11a of the cylinder 11, which is located above the flange 18, penetrates the top wall 17a of the attachment cap 17 and projects upward.

[0017] The lower part of the cylinder 11 is formed into a multi-stage cylindrical shape whose diameter decreases downward. The upper end of a suction pipe 20 is fitted into the lower opening of the cylinder 11. A communication hole 21 is formed at the lower end of the cylinder 11, which opens in the vertical direction and communicates with the inside of the container body through the upper opening of the suction pipe 20. A valve element 22 is disposed within the cylinder 11, and is movable upward relative to the periphery of the opening of the communication hole 21 on the inner surface of the cylinder 11 (see Figure 4).

[0018] In the illustrated example, an annular plate 11d protruding radially inward is formed on the inner surface of the lower end of the cylinder 11, with the inside of this plate 11d forming a communication hole 21. The upper end opening edge of the suction pipe 20 abuts against the lower surface of the plate 11d. A valve element 22 is disposed on the upper surface of the plate 11d so as to be elastically displaceable upward. The valve element 22 switches between communication through the communication hole 21 between the inside of the container body and a storage chamber 11c located within the cylinder 11 between a main body portion (upper support portion) 27a (described later) and the communication hole 21.

[0019] As shown in FIG. 2, the ejection head 15 is screwed onto a holding member 24 that holds the ejection head 15 at the lowermost position. The holding member 24 is formed in a cylindrical shape and includes an inner cylinder 24a fitted into the upper end 11a of the cylinder 11, and an outer cylinder 24b that surrounds the inner cylinder 24a from the outside in the radial direction and is fitted onto the upper end 11a of the cylinder 11. The upper end of the inner cylinder 24a is located higher than the upper end of the outer cylinder 24b, and a male thread portion onto which the discharge head 15 is screwed is formed on the outer peripheral surface of the upper end of the inner cylinder 24a.

[0020] The piston 14 includes an inner cylinder 25, an outer cylinder 26, and a connecting portion 14a, and is engaged with the up and down movement of the stem 13 and is fitted in the cylinder 11 so as to be able to slide up and down. The outer cylinder 26 surrounds the inner cylinder 25 from the outside in the radial direction. Both vertical end portions of the outer cylinder 26 slide vertically within the cylinder 11. The connecting portion 14a connects the vertical middle portions of the inner cylinder 25 and the outer cylinder 26 to each other in the radial direction.

[0021] The stem 13 is formed into a cylindrical shape extending in the vertical direction. The stem 13 is supported by a coil spring 12 provided in the cylinder 11 while being biased upward and movable downward. The stem 13 is inserted into the inner tube 24a of the holding member 24 so as to be movable up and down. The diameter of the lower end of the stem 13 is larger than the diameter of the portion located above the lower end. The upper end of the inner tube 25 of the piston 14 is fitted into the lower end of the stem 13 so as to be liquid-tight and slidable up and down. The lower end opening edge of the stem 13 faces the upper surface of the connecting portion 14a of the piston 14 in the vertical direction while being spaced upward. A piston guide 27 is fitted into the lower part of the stem 13.

[0022] The piston guide 27 is connected to the stem 13 in a state where relative rotation around the pump axis O is restricted. The piston guide 27 protrudes downward from the lower end of the stem 13. The piston guide 27 may be formed integrally with the stem 13.

[0023] The piston guide 27 includes a main body portion (upper support portion) 27a, a connecting portion 27b, and a support protrusion 27c. The main body 27a is formed in a cylindrical shape with a top, and supports the upper end of the coil spring 12. The main body 27a is located below the stem 13. The connecting portion 27b extends upward from the top wall of the main body portion 27a and is fitted into the lower portion of the stem 13. The connecting portion 27b is configured of a plurality of plates whose front and back surfaces face in the circumferential direction and which intersect with each other on the pump axis O. The radially outer ends of the plurality of plates are fitted into the lower portion of the stem 13. The support protrusions 27c protrude radially outward from the outer circumferential surface of the peripheral wall of the main body 27a. A plurality of the support protrusions 27c are provided at intervals in the circumferential direction. The support protrusions 27c abut against or are close to the inner circumferential surface of the cylinder 11. The lower end of inner cylinder 25 of piston 14 abuts against an outer peripheral edge portion of the top wall of main body portion 27a that is located radially outward from connecting portion 27b so as to be able to move upward and away from it. When the lower end of inner cylinder 25 of piston 14 abuts against or moves away from the outer peripheral edge portion of the top wall of main body portion 27a, communication between the inside of stem 13 and the inside of accommodation chamber 11c of cylinder 11 is switched between being connected and being cut off.

[0024] The discharge head 15 is attached to the upper end of the stem 13 in a state where relative rotation about the pump axis O is restricted. This restricts relative rotation about the pump axis O between the discharge head 15 and the main body (upper support portion) 27a. A discharge hole 29 for the content is formed in the discharge head 15. The discharge head 15 is formed in a topped cylindrical shape. A mounting tube portion 28 that protrudes downward and is fitted to the upper end of the stem 13 is formed in the top wall 15a of the discharge head 15. A discharge tube 15c that extends radially outward and protrudes radially outward from the peripheral wall 15b of the discharge head 15 is formed in the mounting tube portion 28. The interior of the discharge tube 15c is connected to the interior of the stem 13, and the radial outer end opening of the discharge tube 15c serves as the discharge hole 29 through which the content is discharged. On the inner peripheral surface of the peripheral wall 15 b of the discharge head 15 , a female thread is formed to screw into a male thread formed on the outer peripheral surface of the upper end of the inner cylinder 24 a of the holding member 24 .

[0025] The coil spring 12 is formed in an open-end shape with the metal wire wound around it with gaps in the vertical direction over the entire length. The coil spring 12 is a no-cut type in which the cross-sectional shape of the metal wire is the same over the entire length. When viewed from above, the loosening direction X of the ejection head 15 relative to the holding member 24 around the pump axis O coincides with the direction from top to bottom of the winding direction in which the metal wire of the coil spring 12 is wound in a coil shape around the pump axis O. The coil spring 12 does not have an end turn portion, and the upper end surface 12a of the metal wire that forms part of the upper end of the coil spring 12 faces diagonally upward, facing the tightening direction Y opposite the loosening direction X, while the lower end surface 12b of the metal wire that forms part of the lower end of the coil spring 12 faces diagonally downward, facing the loosening direction X. The cross-sectional shape of the metal wire is circular over its entire length. The pitch of the coil spring 12 is the same over the entire area.

[0026] The upper end of the coil spring 12 is supported by a main body (upper support portion) 27a of the piston guide 27. The upper end of the coil spring 12 is inserted inside the peripheral wall of the main body 27a. The inner peripheral surface of the peripheral wall of the main body 27a supports the outer peripheral surface of the upper end of the coil spring 12. The main body portion 27a has an upper support surface 32, an upper cylinder 33, and an upper receiving surface 34. It is to be noted that the main body portion 27a does not necessarily have to have the upper receiving surface 34.

[0027] The upper tube 33 is inserted into the upper end of the coil spring 12 and supports the inner circumferential surface of the upper end of the coil spring 12. The upper tube 33 extends downward from the lower surface of the top wall of the main body portion 27a. A radial gap is provided between the outer circumferential surface of the upper tube 33 and the inner circumferential surface of the peripheral wall of the main body portion 27a, and the upper end of the coil spring 12 is inserted into this gap. A plurality of vertical ribs that protrude radially outward and extend vertically are formed at intervals in the circumferential direction on the outer circumferential surface of the upper tube 33. The upper support surface 32 faces downward and extends continuously around the entire circumference. The upper edge of the coil spring 12 abuts against the upper support surface 32. The upper support surface 32 is a portion of the lower surface of the top wall of the main body 27a that is located between the outer peripheral surface of the upper tube 33 and the inner peripheral surface of the peripheral wall of the main body 27a. The upper receiving surface 34 extends downward from the upper support surface 32 and faces the loosening direction X. An upper end surface 12a of the metal wire that forms part of the upper end of the coil spring 12 abuts against the upper receiving surface 34. The upper end of the upper end surface 12a is the upper edge of the coil spring 12 and abuts against the upper support surface 32.

[0028] In the illustrated example, an upper inclined portion 35 is formed on the upper support surface 32, the amount of downward protrusion of which increases in the loosening direction X, and the end face of the upper inclined portion 35 in the loosening direction X serves as the upper support surface 34. As shown in FIG. 3 , the upper inclined portion 35 is provided over an angular range of approximately 180° around the pump axis O.

[0029] The lower end of the coil spring 12 is supported by a lower support portion 41. The lower support portion 41 is provided in the cylinder 11 at a portion that continues from above the plate body 11d to the upper surface of the plate body 11d. The lower support portion 41 includes an upper plate 42, a lower plate 43, a connecting plate 44, and the above-mentioned valve body 22. The upper plate 42 and the lower plate 43 are each formed in an annular shape and disposed coaxially with the pump axis O.

[0030] The upper surface of the upper plate 42 faces upward, extends continuously around the entire periphery, and serves as a lower support surface 41a against which the lower end edge of the coil spring 12 abuts. A lower cylinder 45, a lower receiving surface 41b, and a lower inclined portion 46 are formed on the lower support surface 41a. The lower cylinder 45 extends upward from the inner peripheral edge of the lower support surface 41a. The lower cylinder 45 is inserted into the lower end of the coil spring 12 and supports the inner peripheral surface of the lower end of the coil spring 12. On the outer peripheral surface of the lower cylinder 45, a plurality of vertical ribs are formed at intervals in the circumferential direction, protruding radially outward and extending in the up-down direction. The lower support surface 41b extends upward from the lower support surface 41a and faces the tightening direction Y, which is opposite to the loosening direction X. A lower end surface 12b of the metal wire that forms part of the lower end of the coil spring 12 abuts against the lower support surface 41b. The lower end of the lower end surface 12b is the lower edge of the coil spring 12 and abuts against the lower support surface 41a. The lower inclined portion 46 protrudes upward from the lower support surface 41a, and the amount of upward protrusion increases toward the tightening direction Y. The end face of the lower inclined portion 46 in the tightening direction Y serves as the lower support surface 41b. The lower inclined portion 46 is provided over an angular range of approximately 180° around the pump axis O.

[0031] The lower plate 43 is located below the upper plate 42. The lower surface of the lower plate 43 abuts against the outer periphery of the upper surface of the plate body 11d of the cylinder 11. The connecting plate 44 connects the outer peripheral edges of the upper plate 42 and the lower plate 43 in the up-down direction. A plurality of connecting plates 44 are provided at intervals in the circumferential direction. As shown in Fig. 4, the valve body 22 is provided inside the lower plate 43. The outer peripheral surface of the valve body 22 and the inner peripheral surface of the lower plate 43 are connected via elastic connecting pieces 22a. A plurality of elastic connecting pieces 22a are provided at intervals in the circumferential direction. As the elastic connecting pieces 22a elastically deform, the valve body 22 elastically displaces in the up and down directions.

[0032] Next, the operation of the discharge pump 1 configured as above will be described.

[0033] As shown in Figure 2, when the peripheral wall 15b of the discharge head 15 is positioned at the lowermost position and is screwed onto the upper end of the inner tube 24a of the holding member 24, the discharge head 15 is rotated in the loosening direction X around the pump axis O relative to the holding member 24 to release the screwed connection of the discharge head 15 to the holding member 24. In the process of rotating the discharge head 15 in the loosening direction X relative to the holding member 24, the piston guide 27 also rotates together with the discharge head 15, so that the upper receiving surface 34 of the main body 27a abuts against the upper end surface 12a of the metal wire in the loosening direction X, and the lower end surface 12b of the metal wire abuts against the lower receiving surface 41b of the lower support part 41 in the loosening direction X. As a result, the lower support part 41 rotates in the loosening direction X relative to the cylinder 11, and the valve body 22 rotates in the loosening direction X relative to the opening periphery of the communication hole 21 on the inner surface of the cylinder 11. When the discharge head 15 is released from the holding member 24, the upward biasing force of the coil spring 12 causes the discharge head 15 to rise together with the piston guide 27, the piston 14, and the stem 13. At this time, the piston 14 rises as the lower end of the inner cylinder 25 is thrust up against the top wall of the main body 27a of the piston guide 27. As a result, the piston 14 rises while communication between the inside of the stem 13 and the inside of the cylinder 11 is blocked, creating a negative pressure inside the storage chamber 11c of the cylinder 11, causing the valve body 22 to rise and opening the communication hole 21, and the content inside the container body flows into the storage chamber 11c through the suction pipe 20.

[0034] Thereafter, when the discharge head 15 is pressed down, the stem 13 and the piston guide 27 also descend, and the top wall of the main body 27a of the piston guide 27 moves downward away from the lower end of the inner tube 25 of the piston 14, thereby connecting the inside of the stem 13 to the inside of the storage chamber 11c of the cylinder 11. Then, the edge of the opening at the lower end of the stem 13 reaches the upper surface of the connecting portion 14a of the piston 14, and the piston 14 is pushed downward by the stem 13, causing the internal pressure of the storage chamber 11c of the cylinder 11 to increase, causing the content in this storage chamber 11c to be discharged from the discharge hole 29 through the gaps between the support protrusions 27c adjacent to each other in the circumferential direction, the inside of the inner tube 25 of the piston 14, and the inside of the stem 13.

[0035] When the discharge head 15 is pressed down to the lowest position and rotated relative to the holding member 24 in the tightening direction Y, the lower surface of the upper inclined portion 35 of the main body 27a slides over the upper end of the coil spring 12 in the tightening direction Y while in sliding contact with the upper end of the coil spring 12, and the lower end of the coil spring 12 slides over the upper surface of the lower inclined portion 46 of the lower support portion 41 in the tightening direction Y. This allows the peripheral wall 15b of the discharge head 15, which is positioned at the lowest position, to be screwed onto the upper end of the inner tube 24a of the holding member 24.

[0036] As described above, according to the discharge pump 1 of this embodiment, the coil spring 12 is formed in an open-end shape in which the metal wire is wound around the entire area with gaps in the vertical direction. Therefore, compared to a closed-end shape in which end turns are provided at both ends in the vertical direction, the manufacturing labor required for the end turns and the amount of metal material used can be reduced, thereby reducing the cost of the discharge pump 1.

[0037] The main body 27a of the piston guide 27, which supports the upper end of the coil spring 12, has an upper support surface 32 that faces downward and extends continuously around the entire circumference, and the lower support part 41 that supports the lower end of the coil spring 12 has a lower support surface 41a that faces upward and extends continuously around the entire circumference.Therefore, as in the case where the upper support surface 32 and the lower support surface 41a are arranged intermittently in the circumferential direction, for example, it is possible to prevent the upper end of the metal wire that forms part of the upper end of the coil spring 12 from penetrating upward into the non-formed part of the upper support surface 32 and damaging other parts, or the lower end of the metal wire that forms part of the lower end of the coil spring 12 from penetrating downward into the non-formed part of the lower support surface 41a and damaging other parts.

[0038] The main body 27a of the piston guide 27 is provided with an upper tube 33 that supports the inner surface of the upper end of the coil spring 12, and the lower support portion 41 is provided with a lower tube 45 that supports the inner surface of the lower end of the coil spring 12. Therefore, when a compressive force in the vertical direction is applied to the coil spring 12, the upper tube 33 can support the inner surface of the upper end of the coil spring 12, and the lower tube 45 can support the inner surface of the lower end of the coil spring 12. Therefore, even if the coil spring 12 is formed in an open-end shape, it can be compressed and deformed in the vertical direction stably without tilting.

[0039] When the discharge head 15 is rotated together with the main body 27a of the piston guide 27 relative to the retaining member 24 in the loosening direction X to release the screw connection between the discharge head 15 and the retaining member 24, the upper receiving surface 34 of the main body 27a abuts against the upper end surface 12a of the metal wire in the loosening direction X, and the lower end surface 12b of the metal wire abuts against the lower receiving surface 41b of the lower support part 41 in the loosening direction X. As a result, the lower support part 41 rotates in the loosening direction X relative to the cylinder 11, and the valve element 22 rotates in the loosening direction X relative to the periphery of the opening of the communicating hole 21 on the inner surface of the cylinder 11. Even if the valve element 22 has stuck to the periphery of the opening of the communicating hole 21 on the inner surface of the cylinder 11, this sticking can be released.

[0040] An upper inclined portion 35 having an upper receiving surface 34 is formed on the upper support surface 32, and a lower inclined portion 46 having a lower receiving surface 41b is formed on the lower support surface 41a.Therefore, when the discharge head 15 is pressed down and rotated in the tightening direction Y relative to the holding member 24, the lower surface of the upper inclined portion 35 slides against the upper end of the coil spring 12 while moving over the tightening direction Y, and the lower end of the coil spring 12 slides against the upper surface of the lower inclined portion 46 while moving over the tightening direction Y, so that the discharge head 15, which is positioned at the lowest end position, can be easily screwed onto the holding member 24.

[0041] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0042] For example, the discharge pump 1 is not limited to the embodiment described above and may be modified as appropriate to a so-called foam pump, etc., and may also employ a configuration using a valve body of another type such as a poppet valve or a ball valve, or a configuration in which the valve body is disposed within the upper part of the stem 13, etc.

[0043] When viewed from above, the loosening direction X of the discharge head 15 relative to the holding member 24 around the pump axis O and the winding direction of the metal wire from top to bottom may be opposite to each other. The member supporting the upper end of the coil spring 12 and the member supporting the lower end of the coil spring 12 are not limited to the above embodiment and may be modified as appropriate.

[0044] In addition, within the scope of the spirit of the present invention, it is possible to replace the components in the above-described embodiments with well-known components as appropriate, and the above-described modified examples may be combined as appropriate. [Explanation of symbols]

[0045] 1. Discharge pump 11 cylinders 12 coil springs 12a Upper end surface 12b Lower end surface 13 Stem 14 Piston 15 Discharge head 21 Communication hole 22 Valve body 24 Retaining member 27a Main body (upper support part) 29 Discharge hole 32 Upper support surface 33 Upper cylinder 34 Upper receiving surface 35 Upper slope 41 Lower support part 41a Lower support surface 41b Lower receiving surface 45 Lower cylinder 46 Downward slope O Pump shaft X Loosening direction Y Tightening direction

Claims

1. a cylinder extending in the vertical direction and inserted into the container body containing the contents; a coil spring provided within the cylinder; a stem extending in the vertical direction and supported by the coil spring in an upwardly biased state so as to be movable downward; a piston fitted in the cylinder so as to be vertically slidable and linked to the vertical movement of the stem; a discharge head attached to the upper end of the stem and having a discharge hole for the contents formed therein; The coil spring is formed in an open-end shape in which a metal wire is wound over the entire area with gaps in the vertical direction, The upper support portion supporting the upper end of the coil spring is an upper support surface that faces downward, extends continuously around the entire circumference, and against which the upper edge of the coil spring abuts; an upper cylinder that supports an inner circumferential surface of an upper end of the coil spring, The lower support portion that supports the lower end of the coil spring is a lower support surface that faces upward, extends continuously around the entire circumference, and against which the lower end edge of the coil spring abuts; a lower cylinder that supports the inner circumferential surface of the lower end of the coil spring.

2. a holding member to which the ejection head located at the lowermost position is screwed is provided; a loosening direction of the discharge head relative to the holding member around the pump shaft coincides with a direction from top to bottom of a winding direction in which the metal wire is wound in a coil shape around the pump shaft, when viewed from above; the upper support portion is provided in a state in which rotational movement around the pump shaft relative to the discharge head is restricted, the upper support portion is provided with an upper receiving surface that faces the loosening direction and abuts against an upper end surface of the metal wire that constitutes a part of the upper end portion of the coil spring, the lower support portion is provided with a lower support surface that faces the tightening direction opposite to the loosening direction and abuts against a lower end surface of the metal wire that constitutes a part of the lower end of the coil spring, a communication hole that opens in the vertical direction and communicates with the inside of the container body is formed at the lower end of the cylinder; The discharge pump according to claim 1 , wherein the lower support portion includes a valve body disposed on the inner surface of the cylinder so as to be movable upwardly away from an opening periphery of the communication hole.

3. an upper inclined portion is formed on the upper support surface, the amount of downward protrusion of which increases in the loosening direction; an end surface of the upper inclined portion in the loosening direction serves as the upper receiving surface; The lower support surface is formed with a downwardly inclined portion whose upward protrusion increases in the tightening direction, The discharge pump according to claim 2 , wherein an end face of the lower inclined portion in the tightening direction serves as the lower support surface.

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