Liquid ejector

Abstract

To provide a liquid ejector which can be easily switched from a dischargeable position to a locked position even if a synthetic resin spring member for urging a head part upward becomes settling.SOLUTION: A liquid ejector 100 according to the present disclosure includes an attachment member 3 for attachment to a container body C, a blind bore type cylinder 1, a stem 6 arranged for up and down movements within the cylinder 1, a piston 13 sliding on the inner peripheral surface of the cylinder 1, and a head portion 30 attached to the stem 6 so as to be able to be pressed down. The head portion 30 is urged upward by a spring member SP made of synthetic resin, the attachment member 3 has an upper peripheral wall 4a erected on a top wall 4, the upper peripheral wall 4a is provided with guide grooves 4g1, 4g2 for guiding convex ribs 8f1, 8f2 provided on the head portion 30 in the up / down direction, and an inclined portion 4s is provided at a height position away from the upper ends of the guide grooves 4g1, 4g2 by a predetermined distance below for raising the convex ribs 8f1, 8f2 while guiding them to lock grooves 4m1, 4m2.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a liquid ejector that is attached to the mouth of a container body and ejects the contents within the container body to the outside world. [Background technology]

[0002] As an example of a conventional liquid ejector, as shown in Patent Document 1, there is disclosed an ejector that includes a stem arranged so as to be able to move downwards while being biased upwards, a cylindrical cylinder into which the stem is inserted, a piston that is linked to the up and down movement of the stem within the cylinder and is fitted onto the inner surface of the cylinder so as to be able to slide up and down, and a head portion that is attached to the upper end of the stem and has a nozzle hole for ejecting the liquid content.

[0003] Among the above-mentioned types of ejectors, there are some that can be switched between an ejection position where the contents can be ejected by pressing the head portion, and a locked position where the contents cannot be ejected, by rotating the head portion in a circumferential direction at the top dead center. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2022-69928 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when synthetic resin is used for the spring member for biasing the head portion and stem upward, the spring member may undergo plastic deformation (so-called "sagging") with repeated use, and the head portion may not return to the top dead center at the beginning of use. Meanwhile, the nozzle head is often designed so that it can only be rotated from the dischargeable position to the locked position when the head portion is near the top dead center. Therefore, when the head portion does not return to the top dead center due to the "sagging" of the spring member, it cannot be changed to the locked position, and there is room for improvement in this regard.

[0006] An object of the present disclosure is to provide a liquid ejector that can be easily switched from a dischargeable position to a locked position even if the synthetic resin spring member that urges the head portion upward becomes worn. [Means for solving the problem]

[0007] In order to solve the above problems, the liquid ejector of the present disclosure comprises: [1] An attachment member to be attached to the mouth of the container body; a bottomed cylindrical cylinder that hangs down from the mounting member; A stem that is vertically movable within the cylinder; a piston that is linked to the up and down movement of the stem in the cylinder and slides on an inner circumferential surface of the cylinder; a head portion which is attached to the upper portion of the stem in a depressable manner, is biased upwardly against the cylinder, and has a nozzle which ejects the contents; Equipped with The head portion is biased upward by a spring member made of synthetic resin, the mounting member has a peripheral wall mounted to the mouth portion from the radially outer side, a top wall closing an upper end of the peripheral wall, and an upper cylindrical wall standing on the top wall, The upper peripheral wall is provided with a guide groove extending in the vertical direction and guiding a convex rib provided on the head portion in the vertical direction, the protruding rib moves relative to the lock groove in a circumferential direction via an upper portion of the guide groove, thereby switching the head portion to a locked position where it cannot be pressed down, The present invention is characterized in that an inclined portion is provided at a height position a predetermined distance below the upper end of the guide groove, which guides the protruding rib upwardly into the lock groove.

[0008] The liquid ejector of the present invention further comprises: [2] In the configuration described in [1] above, it is preferable that the upper tube wall has a retaining wall that prevents the convex rib from slipping out upward when the convex rib is in the locking groove or the inclined portion, and that a seal release rib that protrudes downward is provided on the underside of the retaining wall at the inclined portion, and that a piston guide that supports the piston from below is attached to the lower part of the stem.

[0009] In order to solve the above problems, the liquid ejector of the present disclosure comprises: [3] An attachment member to be attached to the mouth of the container body; a bottomed cylindrical cylinder that hangs down from the mounting member; A stem that is vertically movable within the cylinder; a piston that is linked to the up and down movement of the stem in the cylinder and slides on an inner circumferential surface of the cylinder; a head portion which is attached to the upper portion of the stem in a depressable manner, is biased upwardly against the cylinder, and has a nozzle which ejects the contents; Equipped with The head portion is biased upward by a spring member made of synthetic resin, the mounting member has a peripheral wall mounted to the mouth portion from the radially outer side, a top wall closing an upper end of the peripheral wall, and an upper cylindrical wall standing on the top wall, A guide groove is provided on the outer peripheral wall of the head portion to extend in the vertical direction and to guide a convex rib provided on the upper cylindrical wall in the vertical direction, the protruding rib moves relative to the lock groove in a circumferential direction via a lower portion of the guide groove, thereby switching the head portion to a locked position where it cannot be pressed down, The present invention is characterized in that an inclined portion is provided at a height position a predetermined distance above the lower end of the guide groove, which guides the convex rib into the lock groove while lowering it relative to the head portion.

[0010] The liquid ejector of the present invention further comprises: [4] In the configuration described in [3] above, it is preferable that the head portion has a retaining wall that prevents the convex rib from slipping out downward when the convex rib is in the locking groove or the inclined portion, and that a seal release rib that protrudes upward is provided on an upper surface of the retaining wall at the inclined portion, and that a piston guide that supports the piston from below is attached to the lower part of the stem. Effect of the Invention

[0011] According to the present disclosure, it is possible to provide a liquid ejector that can be easily switched from a dischargeable position to a locked position even if the synthetic resin spring member that urges the head portion upward becomes worn. [Brief description of the drawings]

[0012] [Figure 1] 1 is a front cross-sectional view (view from the left and right direction of the lock groove) of a liquid ejector according to an embodiment of the present disclosure in a locked position. FIG. [Diagram 2] FIG. 2 is a top view of a liquid ejector in a locked position according to one embodiment of the present disclosure. [Diagram 3] FIG. 3 is a view taken along the arrow A in FIG. 2. [Figure 4] FIG. 13 is a right side cross-sectional view (view from the left and right direction of the guide groove) showing a liquid ejector according to an embodiment of the present disclosure in a state where the liquid ejector is in an ejection position. [Diagram 5] FIG. 2 is a plan view of a liquid ejector according to an embodiment of the present disclosure in a state where the liquid ejector is in a dischargeable position. [Figure 6A]FIG. 2 is an enlarged cross-sectional view of the piston area of ​​a liquid ejector according to one embodiment of the present disclosure in a locked position. [Figure 6B] An enlarged cross-sectional view of the piston area when the convex rib abuts against the seal release rib and the head portion is pushed slightly downward as the liquid ejector of one embodiment of the present disclosure moves from a locked position to a dischargeable position. [Figure 6C] 1 is an enlarged cross-sectional view of a piston region of a liquid ejector according to an embodiment of the present disclosure with a head portion of the liquid ejector pushed downward in a dischargeable position. FIG. [Figure 7] 1 is a right side cross-sectional view showing a state in which a head portion of a liquid ejector according to an embodiment of the present disclosure is biased upward from a pressed-down state but has not yet reached the original top dead center; FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] A liquid ejector 100 according to an embodiment of the present disclosure will now be described in detail with reference to the drawings (FIGS. 1 to 7).

[0014] In Fig. 1, reference numeral 1 denotes a cylinder 1 having a flange 2 disposed via a packing PK at the upper end of the mouth C2 of the container body C, and hanging downward through the inside of the mouth C2 of the container body C from an attachment member 3 described later. The cylinder 1 comprises a cylindrical cylinder body 1a with a bottom, a valve seat 1e provided at the bottom of the cylinder 1 on which a suction valve 10 is seated, and an outside air introduction hole 1d provided at approximately the center height of the cylinder body 1a. The outside air introduction hole 1d is provided to take in outside air into the container body C. That is, when the inside of the container body C is in a negative pressure state, the outside air taken in from the upper end opening of the cylinder 1 is taken into the container body C via the outside air introduction hole 1d.

[0015] In this specification, claims, and drawings, the up-down direction means the upper and lower directions when the liquid ejector 100 is attached to the container body C and in an upright position as shown in Fig. 1. The radially outward direction means the direction away from the central axis O along a straight line passing through the central axis O of the liquid ejector 100 in Fig. 1 and perpendicular to the central axis O, and the radially inward direction means the direction toward the central axis O along the straight line.

[0016] The accompanying drawings of the present disclosure are drawn to equal scale in the vertical and horizontal directions, and the aspect ratio of the liquid ejector 100 in the drawings represents the aspect ratio of the liquid ejector 100 of one embodiment of the present disclosure. However, the configuration, shape, dimensional ratio, etc. of the liquid ejector 100 in the accompanying drawings are merely one embodiment of the present disclosure. The present invention should be interpreted based on the wording of the claims, and is not limited to the configuration, shape, dimensional ratio, etc. shown in the drawings.

[0017] In this embodiment, the container body C is formed by extrusion blow molding a synthetic resin material. Alternatively, a glass container or the like may be used for the container body C.

[0018] Reference numeral 3 denotes an attachment member 3 having a top wall 4 for fixing the flange 2 between itself and the mouth C2 and an upper peripheral wall 4a that rises from the upper surface of the top wall 4 and is integrally provided. The attachment member 3 has a threaded portion 3S on the inside of the peripheral wall 3a, and is detachably attached to the mouth C2 of the container body C. Note that instead of the threaded portion 3S, an engagement protrusion that protrudes radially inward from the mouth C2 may be provided so that the attachment member 3 can be attached to the container body C by plugging. In that case, it is preferable to provide a rotation stopper so that the attachment member 3 does not rotate circumferentially relative to the mouth C2.

[0019] The upper peripheral wall 4a of the mounting member 3 is provided with guide grooves 4g1 and 4g2 that extend in the vertical direction and guide the convex ribs 8f1 and 8f2 that protrude radially outward from the lower portion of the outer peripheral wall 8d of the head portion 30 (pressing member 8) in the vertical direction. As shown in Figures 2 to 5, the guide grooves 4g1 and 4g2 are grooves that extend in the vertical direction and are provided on the inner surface of the upper peripheral wall 4a, and when the head portion 30 is in the dischargeable position as shown in Figures 4 and 5 (when the convex ribs 8f1 and 8f2 and the guide grooves 4g1 and 4g2 are aligned in the circumferential direction, respectively), the convex ribs 8f1 and 8f2 move up and down within the guide grooves 4g1 and 4g2, respectively, so that the head portion 30 can move up and down from the top dead center to the bottom dead center.

[0020] The upper peripheral wall 4a has on its inner surface locking grooves 4m1 and 4m2 for positioning the protruding ribs 8f1 and 8f2 therein to switch the head portion 30 to a locked position where it cannot be pushed downward. The locking grooves 4m1 and 4m2 are provided at circumferential positions rotated approximately 80 degrees clockwise around the central axis O from the guide grooves 4g1 and 4g2 in a plan view, and have approximately the same shapes as the guide grooves 4g1 and 4g2 in a plan view. Unlike the guide grooves 4g1 and 4g2, the locking grooves 4m1 and 4m2 are provided in a limited height range directly below the retaining wall 4b of the upper peripheral wall 4a in the vertical direction (see FIG. 3).

[0021] As shown in Fig. 3, the guide groove 4g1 and the lock groove 4m1 are connected at the upper part of the guide groove 4g1, and the head part 30 can be switched between the dischargeable position and the locked position by the movement of the protruding rib 8f1 between the guide groove 4g1 and the lock groove 4m1. Note that, although Fig. 3 shows only the guide groove 4g1 and the lock groove 4m1, as shown in Fig. 2 and Fig. 5, a guide groove 4g2 and a lock groove 4m2 are provided at positions facing the guide groove 4g1 and the lock groove 4m1 in the circumferential direction, respectively.

[0022] 2 and 5, the angle between the guide grooves 4g1, 4g2 and the lock grooves 4m1, 4m2 is smaller than 90 degrees, and is set to about 80 degrees in the illustrated example. With this configuration, the head unit 30 can be moved from the locked position to the dischargeable position with a smaller angular movement.

[0023] In this embodiment, a seal release rib 4bp protruding downward is provided on the underside of the retaining wall 4b at a circumferential position between the guide groove 4g1 and the lock groove 4m1 as shown in Fig. 3. The seal release rib 4bp has a generally rectangular shape that is long in the circumferential direction in a plan view as shown in Fig. 2 and Fig. 5, and has a triangular shape in the height direction that is maximized at the circumferential center position as viewed from the arrow A in Fig. 3.

[0024] In this way, by providing the seal release rib 4bp at a circumferential position between the guide groove 4g1 and the lock groove 4m1, when the head portion 30 is switched from the locked position to the dischargeable position, the convex rib 8f1 of the head portion 30, which is biased upward by the spring member SP, moves toward the guide groove 4g1 along the lower surface of the retaining wall 4b. During this movement from the lock groove 4m1 to the guide groove 4g1, the convex rib 8f1 rides up the seal release rib 4bp, and the piston guide 11 connected to the head portion 30 (pressing member 8) also moves slightly downward. This movement of the piston guide 11 causes the state in which the lower seal portion 13d of the piston 13 abuts against the base portion 11c of the piston guide 11 at the locked position shown in FIG. 6A to a state in which the base portion 11c is slightly separated from the lower seal portion 13d as shown in FIG. 6B, so that the pressurizing chamber 1f communicates with the inside of the piston guide 11. As a result, even if, for example, highly volatile contents are contained in the storage space S of the container body C and the internal pressure in the container body C is high, by slightly separating the base portion 11c from the lower seal portion 13d as shown in Fig. 6B, the internal pressure in the container body C can be released to the outside from the liquid flow path L and the nozzle flow path N through the pressurizing chamber 1f and the inside of the piston guide 11. Therefore, even if the head portion 30 is further pressed in from the state shown in Fig. 6B and the piston 13 passes through the outside air introduction hole 1d as shown in Fig. 6C, it is possible to prevent the contents in the container body C from leaking out to the outside through the outside air introduction hole 1d due to the internal pressure in the container body C.

[0025] In this embodiment, an inclined portion 4s is provided at a circumferential position between the guide groove 4g1 and the lock groove 4m1 as shown in Fig. 3. The inclined portion 4s is inclined upward from a height position that is a predetermined distance below the upper end of the guide groove 4g1 toward the lock groove 4m1. By providing such an inclined portion 4s, even if the spring member SP that urges the head portion 30 upward undergoes plastic deformation (the occurrence of so-called ``sagging'') and the head portion 30 no longer returns to the top dead center at the start of use as shown in Figure 7, if the height position of the convex ribs 8f1, 8f2 of the head portion 30 after the ``sagging'' occurs is higher than the height position of the end of the guide groove 4g1 side of the inclined portion 4s (a height position a predetermined distance lower than the upper end of the guide groove 4g1), by rotating the head portion 30 clockwise in a planar view from that height position of the head portion 30, the convex rib 8f1 can move from the guide groove 4g1 into the inclined portion 4s and enter the locking groove 4m1 while climbing the slope of the inclined portion 4s. Therefore, even if the spring member SP becomes sagged, the user can simply perform the normal switching operation of rotating the head portion 30 around the central axis O without intentionally pulling up the head portion 30, and the convex rib 8f1 can climb the inclined portion 4s and reach the locking groove 4m1, thereby switching from the dischargeable position to the locked position.

[0026] 3 shows only the guide groove 4g1, the lock groove 4m1, and the seal release rib 4bp and the inclined portion 4s provided between them in the circumferential direction, but as shown in Fig. 2 and Fig. 5, a guide groove 4g2 and a lock groove 4m2 are provided at positions facing the guide groove 4g1 and the lock groove 4m1 in the circumferential direction, respectively. And, a seal release rib 4bp and an inclined portion 4s are also provided between the guide groove 4g2 and the lock groove 4m2 in the circumferential direction.

[0027] In this embodiment, the circumferential widths of the guide groove 4g1, the lock groove 4m1, and the protruding rib 8f1 are configured to be greater than the circumferential widths of the guide groove 4g2, the lock groove 4m2, and the protruding rib 8f2, respectively. This configuration makes it possible to prevent the head part 30 from being attached to the attachment member 3 in a state where it is rotated 180 degrees.

[0028] The head portion 30 of the liquid ejector 100 according to this embodiment includes a pressing member 8 and a nozzle 12, and the contents stored in the cylinder 1 are pressure-transferred to the head portion 30 by pressing the pressing member 8.

[0029] The pressing member 8 includes an outer peripheral wall 8d, an inner peripheral wall 8e provided radially inside the outer peripheral wall 8d, a horizontal wall 8c connecting the upper parts of the outer peripheral wall 8d and the inner peripheral wall 8e, and a pressing part 8a that is pressed down by a user when discharging the contents. The contents pressurized in the cylinder 1 are pumped through a liquid flow path L in the stem 6 into the inner peripheral wall 8e.

[0030] A nozzle 12 is provided integrally with the pressing member 8. The nozzle 12 is provided to protrude from the pressing member 8 in the left direction in FIG. 1, and causes the contents pressure-fed into the inner circumferential wall 8e to be discharged to the outside from the nozzle hole 12a via the nozzle flow path N.

[0031] As described later, the stem 6 and the piston guide 11 are lowered by pushing down the pressing member 8, so that the liquid-permeable rib 11d and the lower seal portion 13d are separated from each other, and the expanded diameter portion 6a at the bottom of the stem 6 presses the piston 13. As a result, the contents are pumped upward through the liquid flow path L via the pressurizing chamber 1f and the liquid flow path L in the stem 6, and are discharged to the outside from the nozzle hole 12a via the nozzle flow path N of the nozzle 12.

[0032] 1, a stem 6 is erected facing upward within the cylinder 1. The stem 6 is a cylindrical member that connects the pressing member 8 and the piston guide 11, and is movable up and down within the cylinder 1. The stem 6 is fixed to the pressing member 8 by fitting the inner peripheral wall 8e of the pressing member 8 onto the inner surface of the upper end of the stem 6.

[0033] A liquid flow path L is formed inside the cylindrical stem 6. The liquid flow path L pressure-feeds the content in the pressurized chamber 1f of the compressed cylinder 1 upward through the liquid flow path L and supplies it to the nozzle 12.

[0034] A piston guide 11 is attached to the lower part of the stem 6. The piston guide 11 includes a central cylinder portion 11b attached to the lower part of the stem 6, a seat portion 11c extending radially outward from the lower end of the central cylinder portion 11b, and liquid-permeable ribs 11d provided intermittently in the circumferential direction on the outer edge of the seat portion 11c. A communication hole 11a is provided below the central height of the central cylinder portion 11b to guide the contents pressurized in the pressurizing chamber 1f into the liquid flow path L. The contents compressed in the pressurizing chamber 1f of the cylinder 1 are discharged from the nozzle hole 12a via the liquid flow path L and the nozzle flow path N.

[0035] A piston 13 is disposed below the stem 6 and above the base portion 11c. The piston 13 is linked to the up and down movement of the stem 6 inside the cylinder 1 and slides on the inner circumferential surface of the cylinder 1. The piston 13 includes an upper sliding portion 13a and a lower sliding portion 13b that slide on the inner surface of the cylinder body 1a, an upper seal portion 13c that abuts against the enlarged diameter portion 6a of the stem 6, and a lower seal portion 13d that abuts against the base portion 11c to open and close the communication between the pressurizing chamber 1f and the liquid flow path L. The piston 13 moves downward to compress the contents in the pressurizing chamber 1f.

[0036] As shown in FIG. 1, a ring member 7 is fitted and attached to the inner surface of the cylinder 1 at the top of the cylinder 1. The ring member 7 includes a main cylinder portion 7c arranged along the inner surface of the cylinder 1, a lower end seal portion 7b provided at the lower portion of the main cylinder portion 7c and contacting the upper sliding portion 13a of the piston 13 at the top dead center of the pressing member 8, an inner ring 7d connected to the radially inner side of the main cylinder portion 7c, and an upper flange 7e extending radially outward from the upper end of the main cylinder portion 7c. A seal protrusion 7a is provided on the outer surface of the main cylinder portion 7c to seal the space between the ring member 7 and the cylinder 1 by contacting the inner surface of the cylinder body 1a (see FIG. 1). The seal protrusion 7a can be provided at any height position between the outside air introduction hole 1d and the upper flange 7e. By providing the seal protrusion 7a, it is possible to prevent the contents in the container body C from leaking upward via the outside air introduction hole 1d. Also, instead of the sealing projection 7a, for example, the upper flange 7e and the cylinder 1 may be configured to provide a liquid-tight seal.

[0037] The cylinder body 1a is provided with an outside air introduction hole 1d for introducing outside air from the outside when the container body C becomes negative pressure due to the discharge of the contents. In this embodiment, the outside air introduction hole 1d is provided below the seal protrusion 7a in the main tube portion 7c.

[0038] Reference numeral 10 denotes a suction valve 10 that opens and closes a suction port A1 formed at the bottom end of the cylinder 1 in response to the up and down movement of the piston 13. In this embodiment, the suction valve 10 is configured as a three-point valve supported by three elastic arms. As shown in Fig. 1, the suction valve 10 has a valve body fixed to the bottom of the cylinder 1 by a valve fixing wall 10a.

[0039] The pressing member 8 is urged upward by a spring member SP against the ring member 7 fixed to the cylinder 1 as shown in FIG. 1. The spring member SP urges the pressing member 8 upward by a reaction force of pressing downward the recessed portion 7f formed at the lower end of the inner ring 7d of the ring member 7 as shown in FIG. 1. The pressing member 8 is attached to the stem 6, and the pressing member 8 is configured to move up and down together with the stem 6 and the piston guide 11. When a user presses the pressing portion 8a of the pressing member 8, the stem 6 and the piston guide 11 move downward together, and the pressurized chamber 1f and the liquid flow path L are communicated, and then the piston 13 is pressed down by the lower end of the enlarged diameter portion 6a of the stem 6 and moves downward. When the piston 13 moves downward, the contents in the pressurized chamber 1f of the cylinder 1 pass between the liquid-passing ribs 11d of the piston guide 11 and through the communication hole 11a, and are pumped upward through the liquid flow path L.

[0040] The liquid ejector 100 may be configured so that the head portion 30 is covered with a cover member not shown in FIG.

[0041] Moreover, each member constituting the liquid ejector 100 can be formed from, for example, various synthetic resin materials.

[0042] In the liquid ejector 100 having the configuration shown in Fig. 1, when a user uses the contents, the head portion 30 is first rotated counterclockwise in a plan view to switch from the locked position shown in Fig. 1 and Fig. 2 to the dischargeable position shown in Fig. 4 and Fig. 5. At this time, the convex ribs 8f1, 8f2 overcome the seal release rib 4bp as described above, so that the internal pressure in the container body C can be released from the liquid flow path L and the nozzle flow path N to the outside through the pressurizing chamber 1f and the inside of the piston guide 11.

[0043] Next, the user presses the pressing member 8 of the head portion 30 downward. When the pressing member 8 is pressed down, the stem 6 fixed to the inner peripheral wall 8e of the pressing member 8 is pressed down, and the piston guide 11 fitted to the lower part of the stem 6 is also pressed down. As a result, the liquid-permeable rib 11d and the lower seal part 13d are separated, and the pressurizing chamber 1f and the liquid flow path L are communicated. In addition, as the stem 6 is pressed down, the enlarged diameter part 6a of the stem 6 is pressed down and abuts against the piston 13, so that the piston 13 is also pressed down slightly later than the piston guide 11. As the piston 13 is pressed down, the liquid in the pressurizing chamber 1f is pressure-fed upward through the liquid flow path L via the liquid-permeable rib 11d and the communication hole 11a.

[0044] The contents pumped through the liquid flow path L pass through the inner circumferential wall 8e of the pressing member 8, and then pass through the nozzle flow path N protruding to the left in FIG. 1, and are discharged to the outside from the nozzle hole 12a.

[0045] When the lower end of the piston guide 11 abuts against the upper end of the valve fixing wall 10a and presses the pressing member 8 down to the lower limit of its movable range, compression of the contents in the pressurizing chamber 1f ends and pressure-feeding of the contents toward the nozzle 12 also stops. When the user releases the pressure on the pressing portion 8a, the pressing member 8, stem 6 and piston guide 11 are displaced upward by the biasing force of the spring member SP.

[0046] As the pressing member 8, stem 6, and piston guide 11 rise, the piston 13 also seats on the seat portion 11c again, blocking communication between the pressurized chamber 1f and the liquid flow path L, and the volume inside the pressurized chamber 1f increases due to the rise of the piston 13, creating a negative pressure. This negative pressure causes the valve body of the suction valve 10, which was seated on the valve seat 1e, to rise and open, and the contents inside the container body C from the pipe P are introduced into the cylinder 1 via the suction port A1. The introduced contents are pressurized inside the cylinder 1 by the next pressure of the pressing member 8, and are discharged from the nozzle hole 12a via the liquid flow path L and the nozzle flow path N.

[0047] When a user uses the contents in the container body C by pressing the pressing member 8, the remaining amount of contents in the storage space S decreases, and a negative pressure is applied inside the container body C. This negative pressure causes outside air introduced from the gap between the outer peripheral wall 8d and the upper peripheral wall 4a to pass through the gap between the stem 6 and the inner ring 7d, and further pass below the lower end seal portion 7b of the ring member 7, and is introduced into the container body C from the gap between the cylinder 1 and the ring member 7 via the outside air introduction hole 1d.

[0048] As described above, the head portion 30 returns to the top dead center shown in FIG. 1 by the biasing force of the spring member SP when the contents are introduced into the cylinder 1. However, when the synthetic resin spring member SP "sags" with an increase in the number of uses of the liquid ejector 100, the head portion 30 may not return to the top dead center at the beginning of use, as shown in FIG. 7. In this embodiment, even if the spring member SP "sags" in this way, if the height position of the convex ribs 8f1 and 8f2 of the head portion 30 after the "sag" occurs is higher than the height position of the end of the guide groove 4g1 side of the inclined portion 4s (a height position lower by a predetermined distance from the upper end of the guide groove 4g1), the head portion 30 can be rotated clockwise in a plan view from that height position of the head portion 30, so that the convex rib 8f1 moves from the guide groove 4g1 into the inclined portion 4s and can enter the lock groove 4m1 while climbing the slope of the inclined portion 4s. Therefore, even if the spring member SP becomes worn, the user does not intentionally pull up the head unit 30, but simply performs the normal switching operation of rotating it about the central axis O, and the protruding rib 8f1 can climb the inclined portion 4s and reach the lock groove 4m1, and the discharge position can be switched to the locked position. The inclination angle of the inclined portion 4s can be appropriately designed according to the degree of wear of the synthetic resin spring member SP. For example, if the spring member SP becomes worn significantly, the inclination angle of the inclined portion 4s can be designed to be large.

[0049] In this embodiment, the upper peripheral wall 4a of the mounting member 3 is provided with the guide grooves 4g1, 4g2, the lock grooves 4m1, 4m2, the seal release rib 4bp, and the inclined portion 4s, and the outer peripheral wall 8d of the pressing member 8 is provided with the convex ribs 8f1, 8f2, but the present invention is not limited to this embodiment. The upper peripheral wall 4a of the mounting member 3 may be provided with the convex rib, and the outer peripheral wall 8d of the pressing member 8 may be provided with the guide groove, the lock groove, the seal release rib, and the inclined portion. In this case, it is preferable that the convex rib is provided by protruding inward at the upper portion of the upper peripheral wall 4a, and the guide groove and the lock groove are provided on the outer surface of the outer peripheral wall 8d. In addition, a slip-out prevention wall may be provided at the lower end of the lock groove and the inclined portion, and a seal release rib may be provided on the upper surface of the slip-out prevention wall. In addition, an inclined portion may be provided that is inclined downward toward the lock groove from a height position that is a predetermined distance above the lower end of the guide groove.

[0050] As described above, this embodiment includes the mounting member 3 to be attached to the mouth C2 of the container body C, the bottomed cylindrical cylinder 1 that hangs down from the mounting member 3, the stem 6 that is arranged to be able to move up and down within the cylinder 1, the piston 13 that is linked to the up and down movement of the stem 6 within the cylinder 1 and slides against the inner circumferential surface of the cylinder 1, and the head portion 30 that is attached to the top of the stem 6 in a depressable manner, is biased upward relative to the cylinder 1, and has the nozzle 12 that dispenses the contents, the head portion 30 being biased upward by a spring member SP made of synthetic resin, and the mounting member 3 includes a peripheral wall 3a that is attached to the mouth C2 from the outside in the radial direction, and a piston 13 that is arranged to slide against the upper surface of the peripheral wall 3a. It has a top wall 4 that closes the end, and an upper peripheral wall 4a that is erected on the top wall 4, and the upper peripheral wall 4a is provided with guide grooves 4g1, 4g2 that extend in the vertical direction and guide the convex ribs 8f1, 8f2 provided on the head portion 30 in the vertical direction, and the head portion 30 can be switched to a locked position where it cannot be pressed down by the convex ribs 8f1, 8f2 moving relatively in the circumferential direction via the upper parts of the guide grooves 4g1, 4g2 to the locking grooves 4m1, 4m2, and at a height position a predetermined distance below the upper ends of the guide grooves 4g1, 4g2, an inclined portion 4s is provided that raises the convex ribs 8f1, 8f2 while guiding them to the locking grooves 4m1, 4m2. By adopting such a configuration, even if the spring member SP that urges the head portion 30 upward becomes "sagging" and the head portion 30 does not return to the top dead center at the beginning of use, if the height position of the convex ribs 8f1, 8f2 of the head portion 30 after the "sagging" occurs is higher than the height position lowered by a predetermined distance from the upper end of the guide groove 4g1, the convex rib 8f1 can move from the guide groove 4g1 into the inclined portion 4s and enter the lock groove 4m1 while climbing the slope of the inclined portion 4s by rotating the head portion 30 from that height position. Therefore, even if the spring member SP becomes "sagging", the convex rib 8f1 can reach the lock groove 4m1 by simply performing a normal switching operation of rotating the head portion 30 around the central axis O without the user intentionally pulling up the head portion 30. Therefore, it is possible to switch from the dischargeable position to the locked position.

[0051] In this embodiment, the upper peripheral wall 4a has a retaining wall 4b that prevents the protruding ribs 8f1, 8f2 from slipping out upward when they are in the lock grooves 4m1, 4m2 or the inclined portion 4s, and a seal release rib 4bp that protrudes downward is provided on the underside of the retaining wall 4b at the inclined portion 4s, and a piston guide 11 that supports the piston 13 from below is attached to the lower portion of the stem 6. By adopting such a configuration, when the head portion 30 is switched from the locked position to the dischargeable position, the piston guide 11 connected to the head portion 30 (pressing member 8) also moves slightly downward, so that the base portion 11c transitions to a state in which it is slightly separated from the lower seal portion 13d, and the internal pressure in the container body C can be released from the liquid flow path L and the nozzle flow path N to the outside through the pressurizing chamber 1f and the inside of the piston guide 11. Therefore, even if the head portion 30 is further pressed in from the state shown in FIG. 6B and the piston 13 passes through the outside air inlet hole 1d as shown in FIG. 6C, the internal pressure within the container body C can be prevented from causing the contents within the container body C to leak to the outside through the outside air inlet hole 1d.

[0052] In another embodiment in which a convex rib is provided on the upper peripheral wall 4a of the mounting member 3 and a guide groove, a lock groove, a seal release rib and an inclined portion are provided on the outer peripheral wall 8d of the pressing member 8, the container includes the mounting member 3 to be mounted on the mouth portion C2 of the container body C, a bottomed cylindrical cylinder 1 that hangs down from the mounting member 3, a stem 6 that is provided so as to be movable up and down within the cylinder 1, a piston 13 that is linked to the up and down movement of the stem 6 within the cylinder 1 and slides on the inner peripheral surface of the cylinder 1, and a head portion 30 that is attached to the upper portion of the stem 6 in a depressable manner, is biased upward against the cylinder 1, and has a nozzle 12 that discharges the contents, and the head portion 30 is provided with a spring portion made of synthetic resin. The mounting member 3 is biased upward by material SP, and has a peripheral wall 3a attached to the mouth portion C2 from the radially outside, a top wall 4 closing the upper end of the peripheral wall 3a, and an upper peripheral wall 4a erected on the top wall 4, and the outer peripheral wall 8d of the head portion 30 is provided with a guide groove extending in the vertical direction and guiding the convex rib provided on the upper peripheral wall 4a in the vertical direction, and the head portion 30 can be switched to a locked position where it cannot be pressed down by the convex rib moving relatively in the circumferential direction via the lower part of the guide groove to the locking groove, and at a height position a predetermined distance above the lower end of the guide groove is provided an inclined portion for guiding the convex rib into the locking groove while descending relative to the head portion 30. By adopting such a configuration, even if the spring member SP that urges the head portion 30 upward becomes "sagging" and the head portion 30 does not return to the top dead center at the beginning of use, if the height position of the convex rib after the "sagging" occurs is lower than the height position that is a predetermined distance above the lower end of the guide groove, the convex rib can move from the guide groove into the inclined portion and enter the lock groove while descending the slope of the inclined portion by rotating the head portion 30 from that height position. Therefore, even if the spring member SP becomes "sagging," the convex rib can reach the lock groove by descending the inclined portion only by performing a normal switching operation of rotating the head portion 30 around the central axis O without the user intentionally pulling up the head portion 30. Therefore, it is possible to switch from the dischargeable position to the locked position.The inclination angle of the inclined portion can be appropriately designed according to the degree of "sagging" of the synthetic resin spring member SP. For example, if the spring member SP is more likely to "sag," the inclination angle of the inclined portion can be designed to be larger.

[0053] In the other embodiment described above, the head portion 30 has a retaining wall that prevents the protruding rib from slipping out downward when the protruding rib is in the lock groove or the inclined portion, and a seal release rib that protrudes upward is provided on the upper surface of the retaining wall at the inclined portion, and a piston guide 11 that supports the piston 13 from below is attached to the lower portion of the stem 6. By adopting such a configuration, when the head portion 30 is switched from the locked position to the dischargeable position, the piston guide 11 connected to the head portion 30 (pressing member 8) also moves slightly downward, so that the base portion 11c transitions to a state in which it is slightly separated from the lower seal portion 13d, and the internal pressure in the container body C can be released from the liquid flow path L and the nozzle flow path N to the outside through the pressurizing chamber 1f and the inside of the piston guide 11. Therefore, even if the head portion 30 is further pressed in from the state shown in FIG. 6B and the piston 13 passes through the outside air inlet hole 1d as shown in FIG. 6C, the internal pressure within the container body C can be prevented from causing the contents within the container body C to leak to the outside through the outside air inlet hole 1d.

[0054] Although the present disclosure has been described based on the drawings and embodiments, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these modifications and corrections are included in the scope of the present invention. For example, the functions included in each component can be rearranged so as not to cause logical inconsistency, and multiple components can be combined into one or divided. It should be understood that these are also included in the scope of the present invention.

[0055] For example, in this embodiment, the ring member 7 and the mounting member 3 are configured as separate members, but the present invention is not limited to this embodiment, and the ring member 7 and the mounting member 3 may be configured as an integral member.

[0056] Furthermore, in this embodiment, the liquid ejector 100 is unitized in advance, but according to the present disclosure, it is also possible to assemble individual parts to the container body C without unitizing it.

[0057] Further, in this embodiment, the stem 6 and the piston guide 11 are configured as separate members, but the present invention is not limited to this embodiment, and the stem 6 and the piston guide 11 may be configured as an integral unit. [Industrial Applicability]

[0058] The present disclosure can be employed as a liquid ejector 100 in the fields of cosmetics such as lotions and hair styling products, medicines such as insect repellents, and beauty and health products, for example. [Explanation of symbols]

[0059] 1 cylinder 1a Cylinder body 1d Air intake hole 1e Valve seat 1f Pressurized Room 2 Flanges 3 Mounting material 3a Peripheral wall 3S Threaded Part 4. Ceiling Wall 4a Upper peripheral wall 4b Retaining wall 4bp seal release rib 4g1, 4g2 guide groove 4m1,4m2 Lock groove 4s slope section 6. Stem 6a Enlarged diameter section 7 Ring member 7a Seal protrusion 7b Bottom seal 7c Main cylinder part 7d Inner ring 7e Upper flange 7f Recess 8 Pressing member 8a Pressing part 8c horizontal wall 8d outer wall 8e Inner wall 8f1,8f2 Convex rib 10. Intake valve 10a Valve fixing wall 11 Piston guide 11a Communication hole 11b Central cylinder part 11c Pedestal 11d Liquid passing rib 12 Nozzles 12a Nozzle hole 13 Piston 13a Upper sliding part 13b Lower sliding part 13c Upper seal 13d Lower seal part 30 Head section 100 liquid squirt A1 Intake port C Container body C2 Mouth L Liquid flow path N Nozzle flow path O center axis P Pipe PK packing S Storage space SP Spring material

Claims

1. An attachment member to be attached to the mouth of the container body; a bottomed cylindrical cylinder that hangs down from the mounting member; A stem that is vertically movable within the cylinder; a piston that is linked to the up and down movement of the stem in the cylinder and slides on an inner circumferential surface of the cylinder; a head portion which is attached to the upper portion of the stem in a depressable manner, is biased upwardly against the cylinder, and has a nozzle which ejects the contents; Equipped with The head portion is biased upward by a spring member made of synthetic resin, The mounting member has a peripheral wall mounted to the mouth portion from the radially outer side, a top wall closing an upper end of the peripheral wall, and an upper peripheral wall erected on the top wall, The upper peripheral wall is provided with a guide groove extending in the vertical direction and guiding a convex rib provided on the head portion in the vertical direction, the protruding rib moves relative to the lock groove in a circumferential direction via an upper portion of the guide groove, thereby switching the head portion to a locked position where it cannot be pressed down, The liquid ejector has an inclined portion at a height position a predetermined distance below an upper end of the guide groove, the inclined portion lifting the protruding rib and guiding it into the lock groove.

2. the upper peripheral wall has a retaining wall that prevents the protruding rib from coming out upward when the protruding rib is in the lock groove or the inclined portion, A seal release rib protruding downward is provided on the lower surface of the retaining wall at the inclined portion, 2. The liquid ejector according to claim 1, wherein a piston guide is attached to a lower portion of the stem for supporting the piston from below.

3. An attachment member to be attached to the mouth of the container body; a bottomed cylindrical cylinder that hangs down from the mounting member; A stem that is vertically movable within the cylinder; a piston that is linked to the up and down movement of the stem in the cylinder and slides on an inner circumferential surface of the cylinder; a head portion which is attached to the upper portion of the stem in a depressable manner, is biased upwardly against the cylinder, and has a nozzle which ejects the contents; Equipped with The head portion is biased upward by a spring member made of synthetic resin, The mounting member has a peripheral wall mounted to the mouth portion from the radially outer side, a top wall closing an upper end of the peripheral wall, and an upper peripheral wall erected on the top wall, A guide groove is provided on the outer peripheral wall of the head portion to extend in the vertical direction and to guide a convex rib provided on the upper peripheral wall in the vertical direction, the protruding rib moves relative to the lock groove in a circumferential direction via a lower portion of the guide groove, thereby switching the head portion to a locked position where it cannot be pressed down, The liquid ejector has an inclined portion at a height position a predetermined distance above the lower end of the guide groove, which guides the convex rib into the lock groove while lowering the convex rib relative to the head portion.

4. the head portion has a retaining wall that prevents the protruding rib from coming out downward when the protruding rib is in the lock groove or the inclined portion, A seal release rib protruding upward is provided on an upper surface of the retaining wall at the inclined portion, 4. The liquid ejector according to claim 3, wherein a piston guide is attached to a lower portion of said stem for supporting said piston from below.

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