Trigger-type dispensing device

Abstract

To provide a trigger-type liquid ejector that can be used for pressurized heat sterilization.SOLUTION: A trigger-type liquid ejector 1 includes an attachment member 10, a push-down body 20, a pump 30 and a trigger 40. The trigger-type liquid ejector 1 further includes: a vertical groove 60 that is provided on an inner surface of a support tube portion 13 and extends from a lower end of the support tube portion 13 to a position lower than an upper end, and communicates with an inside of a container body 2 through a gap 61 between a cylinder 31 and the support tube portion 13 and a gap 62 between the cylinder 31 and a fitting tube portion 12; a first O-ring 70 made of synthetic rubber and attached to an outer peripheral surface of a piston 32; and a second O-ring 71 made of synthetic rubber and attached to an outer peripheral surface of a stem portion 22, and abuts against the inner surface of the support tube portion 13 over the entire circumference above the vertical groove 60 when a push-down body 20 is at a first position, or otherwise, abuts against the inner surface of the support tube portion 13 on a portion where the vertical groove 60 is provided when the push-down body 20 is at a second position.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a trigger-type discharging tool that is attached to the mouth of a container body and used.

Background Art

[0002] Conventionally, as a discharging tool attached to the mouth of a container body and used, it includes a cap portion attached to the mouth of the container body, a fitting cylinder portion connected to the upper part of the cap portion, and a support cylinder portion connected to the upper part of the fitting cylinder portion. A mounting member, a main body portion having a flow path inside and a nozzle connected to the flow path, and a stem portion connected to the main body portion. An operating body supported movably up and down between a first position and a second position below the first position in the support cylinder portion in the stem portion, a cylinder having an inlet at the lower end and fitted and fixed inside the fitting cylinder portion, and an outlet connected to the flow path provided on the axis, a piston attached to the lower end of the stem portion and slidably disposed inside the cylinder, and a check valve for opening and closing the inlet. A pump, a trigger supported rotatably by a rotation shaft on the mounting member and locked to the operating body between the rotation shaft and the operating portion. When the trigger is pulled, the operating body is pushed down from the first position toward the second position by the trigger, and the pump discharges, and the liquid inside the container body is discharged from the inlet through the flow path to the outside through the nozzle. A trigger-type one configured as such is known (see, for example, Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional trigger-type discharge device described above, the piston that makes up the pump is made of relatively flexible low-density polyethylene (LDPE) to ensure sealing against the inner surface of the cylinder.

[0005] Therefore, when a trigger-type dispensing device is attached to the container body containing the liquid, and the liquid in the container body is subjected to retort sterilization (pressure-heat sterilization) using an autoclave or the like, there was a problem that the piston could deform due to the heat, potentially causing the pump to malfunction during use.

[0006] This invention has been made in view of these problems, and its purpose is to provide a trigger-type dispensing device that can handle pressurized heat sterilization. [Means for solving the problem]

[0007] The trigger-type dispensing device of the present invention comprises a mounting member having a cap portion attached to the mouth of a container body, a fitting cylinder portion connected to the upper part of the cap portion, and a support cylinder portion connected to the upper part of the fitting cylinder portion; a main body portion having a flow path inside and a nozzle attached to the flow path; a stem portion connected to the main body portion, the pump having a push-down body supported on the support cylinder portion at the stem portion so as to be movable vertically between a first position and a second position lower than the first position; a cylinder having an inlet at its lower end and fitted and fixed inside the fitting cylinder portion; a piston having an outlet connected to the flow path as its axis and mounted on the lower end of the stem portion and slidably disposed inside the cylinder; a check valve for opening and closing the inlet; and a trigger rotatably supported on the mounting member by a pivot shaft and locked to the push-down body between the pivot shaft and the operating part, wherein when the trigger is pulled, the push-down body is moved by the trigger to the first A trigger-type dispensing device configured to be pushed down from a first position toward the second position, causing the pump to perform a discharge operation and to discharge the liquid inside the container body from the inlet through the flow path to the outside from the nozzle, comprising: a vertical groove provided on the inner circumferential surface of the support cylinder portion, extending from the lower end of the support cylinder portion to a position below the upper end, and communicating with the inside of the container body through the gap between the cylinder and the support cylinder portion and the gap between the cylinder and the fitting cylinder portion; a first O-ring made of synthetic rubber, mounted on the outer circumferential surface of the piston and in contact with the inner circumferential surface of the cylinder; and a second O-ring made of synthetic rubber, mounted on the outer circumferential surface of the stem portion, in contact with the inner circumferential surface of the support cylinder portion over its entire circumference above the vertical groove when the pressing body is in the first position, and in contact with the inner circumferential surface of the support cylinder portion in the portion where the vertical groove is provided when the pressing body is in the second position.

[0008] In the trigger-type dispensing device of the present invention, it is preferable that the first O-ring and the second O-ring are made of fluororubber or acrylonitrile butadiene rubber, respectively.

[0009] In the above configuration, the trigger-type dispensing device of the present invention preferably includes a flange portion integrally provided on the outer circumferential surface of the cylinder and sandwiched between the opening and the mounting member; a through hole provided in the flange portion and communicating the vertical groove with the inside of the container body; and an on / off valve provided below the flange portion, which, in an elastically deformed state, abuts against the flange portion to close the through hole, and is elastically deformable to move away from the flange portion to open the through hole.

[0010] In the trigger-type dispensing device of the present invention, it is preferable that the on-off valve is made of fluororubber.

[0011] In the above configuration, the trigger-type dispensing device of the present invention preferably has an upright / inverted switching mechanism that, when the trigger-type dispensing device is in an upright position, connects the inlet to the bottom side of the container body through a tube connected to the inlet, and when the trigger-type dispensing device is in an inverted position, connects the inlet to the mouth side of the container body. [Effects of the Invention]

[0012] According to the present invention, a trigger-type dispensing device capable of handling pressurized heat sterilization can be provided. [Brief explanation of the drawing]

[0013] [Figure 1] This is a front view cross-sectional view of a discharge container equipped with a trigger-type discharge device according to one embodiment of the present invention. [Figure 2] This is an enlarged cross-sectional view of the piston portion of the trigger-type dispensing device shown in Figure 1. [Figure 3] Figure 1 is a cross-sectional view of the trigger-type dispensing device in the state of dispensing liquid, viewed from the front. [Figure 4] Figure 1 is a cross-sectional view of the trigger-type dispensing device in an inverted position, showing it in a front view while dispensing liquid. [Figure 5] This is an enlarged cross-sectional view of the portion of the trigger-type dispensing device shown in Figure 1 that is equipped with an on / off valve. [Figure 6] It is a cross-sectional view taken along the line A-A in FIG. 5. [Figure 7] It is an enlarged cross-sectional view of the on-off valve shown in FIG. 5 in a state where outside air is taken into the inside of the container body.

Embodiments for Carrying out the Invention

[0014] Hereinafter, a trigger-type applicator according to an embodiment of the present invention will be exemplified and described in detail with reference to the drawings.

[0015] In this specification and the claims, the vertical direction shall mean the vertical direction in the state where the trigger-type applicator 1 is in the upright posture shown in FIG. 1. Further, the radial direction shall mean the direction along a straight line passing through the central axis O and perpendicular to the central axis O.

[0016] As shown in FIG. 1, the trigger-type applicator 1 according to the present embodiment is a so-called dispenser that is attached to the mouth portion 2a of the container body 2 and used. The trigger-type applicator 1 and the container body 2 constitute a discharge container 3. The trigger-type applicator 1 can dispense a predetermined amount of the liquid 4 stored in the container body 2 and discharge it to the outside.

[0017] The container body 2 is, for example, a bottle container made of synthetic resin, and the mouth portion 2a has a cylindrical shape centered on the central axis O. The container body 2 can store the liquid 4 as its content inside.

[0018] The trigger-type applicator 1 has a mounting member 10, a pressing body 20, a pump 30, and a trigger 40.

[0019] The mounting member 10 includes a cap portion 11 attached to the mouth portion 2a of the container body 2, a fitting cylinder portion 12 connected to the upper part of the cap portion 11, and a support cylinder portion 13 connected to the upper part of the fitting cylinder portion 12.

[0020] More specifically, the cap portion 11 is cylindrical with a central axis O and is configured to be attached to the outside of the opening portion 2a by screw connection. Alternatively, the cap portion 11 may be attached to the outside of the opening portion 2a by undercut engagement.

[0021] The fitting cylinder portion 12 is cylindrical with a smaller diameter than the cap portion 11, centered on a central axis O, and is integrally connected to the upper part of the cap portion 11 via the flange portion 14.

[0022] The support cylinder portion 13 is cylindrical with a smaller diameter than the fitting cylinder portion 12, centered on a central axis O, and is integrally connected to the upper part of the fitting cylinder portion 12 via a tapered portion 15 that decreases in diameter towards the top.

[0023] Furthermore, the mounting member 10 has a pair of support wall portions 16 (only one support wall portion 16 is shown in Figure 1). The pair of support wall portions 16 are integrally connected to the flange portion 14, the fitting cylinder portion 12, and the tapered portion 15, and are plate-shaped, extending diagonally upward and to the right in Figure 1, parallel to the central axis O. A connecting rib 17 is provided between the pair of support wall portions 16, and the pair of support wall portions 16 are connected to each other via the connecting rib 17.

[0024] The pressing body 20 has a main body portion 21 and a stem portion 22.

[0025] The main body 21 is cylindrical in shape and has a liquid channel 21a inside, positioned diagonally so that the tip is slightly above the base. A nozzle 23 connected to the channel 21a is attached to the tip of the main body 21. The nozzle 23 has an outlet 23a, which can spray the liquid 4 that has been pumped from the channel 21a outwards.

[0026] In this embodiment, the main body 21 is provided with a valve housing 21b having a larger diameter than the flow path 21a between the flow path 21a and the discharge port 23a. Inside the valve housing 21b are a nozzle tip 23b equipped with a spiral circuit for supplying liquid 4 to the discharge port 23a, a valve 24 that abuts against the stepped surface between the flow path 21a and the valve housing 21b to close the flow path 21a, and a spring member 25 that biases the valve 24 toward the stepped surface. The surface of the valve 25 that abuts against the stepped surface has a packing 26 as a sealing member. The valve 24 has a cylindrical support portion 24a with a smaller diameter than the flow path 21a integrally attached to its axis, and this support portion 24a is positioned in the flow path 21a so that it can move in the direction of approaching and moving away from the stepped surface. The end of the support portion 24a opposite to the valve 24 reaches the base end of the flow path 21a.

[0027] The stem portion 22 is cylindrical with a smaller diameter than the support cylinder portion 13, centered on a central axis O, and is integrally connected to the base end of the main body portion 21 at its upper end. The interior of the stem portion 22 is a flow path 22a for the liquid 4 connected to the flow path 21a of the main body portion 21. The lower end portion of the stem portion 22 is positioned inside the support cylinder portion 13 and is supported by the support cylinder portion 13 so as to be movable in the vertical direction. As a result, the pressing body 20 is supported by the support cylinder portion 13 at the stem portion 22 and is movable in the vertical direction between a first position (the position shown in Figure 1) and a second position (the position shown in Figure 3) which is lower than the first position.

[0028] The pump 30 includes a cylinder 31, a piston 32, and a check valve 33.

[0029] The cylinder 31 has a cylindrical outer shape centered on a central axis O and is equipped with a liquid inlet 31a at its lower end. The cylinder 31 is fitted and fixed inside the fitting cylinder portion 12 at its upper end. The cylinder 31 may be configured to be more firmly held in place by the fitting cylinder portion 12 by undercutting a projection on its outer circumferential surface with a projection on the inner circumferential surface of the fitting cylinder portion 12. The lower end portion of the support cylinder portion 13 is fitted to the inner circumferential surface at the upper end portion of the cylinder 31.

[0030] The cylinder 31 may also be configured such that a flange portion 31b is integrally provided on its outer circumferential surface. The cylinder 31 is stably held by the container body 2 by the flange portion 31b being sandwiched between the upper end of the opening 2a and the flange portion 14 of the mounting member 10.

[0031] As shown in Figure 2, the piston 32 has an outlet 32a connected to the flow paths 21a and 22a at its axis, and is mounted on the lower end of the stem portion 22 and slidably positioned inside the cylinder 31. More specifically, as shown in Figure 2, the piston 32 integrally has an annular piston body 32b with an outer diameter larger than the stem portion 22 and corresponding to the inner diameter of the cylinder 31, and a fixing cylinder portion 32c with a smaller diameter than the stem portion 22, and is mounted on the stem portion 22 by fitting and fixing the fixing cylinder portion 32c inside the lower end of the stem portion 22. With the piston 32 positioned, a cylinder chamber 34 is formed between the piston 32 and the inlet 31a inside the cylinder 31.

[0032] The check valve 33 is spherical in shape and is positioned above the inlet 31a, blocking the inlet 31a. The check valve 33 prevents liquid 4 from flowing out of the cylinder chamber 34 through the inlet 31a to the outside, and when the cylinder chamber 34 becomes negatively pressurized, it opens the inlet 31a, allowing the liquid 4 inside the container body 2 to flow into the cylinder chamber 34 through the inlet 31a.

[0033] As shown in Figure 1, the pump 30 is equipped with a piston guide 35. The piston guide 35 is rod-shaped with a central axis O, and its lower end is held on the lower end side of the cylinder 31, while the upper rod-shaped portion 35a is inserted into the outlet 32a of the piston 32 and the flow path 22a of the stem portion 22. The outer diameter of the upper rod-shaped portion 35a is smaller than the inner diameter of the outlet 32a of the piston 32 and the flow path 22a of the stem portion 22, so that the liquid 4 can flow through the gap between the upper rod-shaped portion 35a and the outlet 32a of the piston 32 or the flow path 22a of the stem portion 22. In addition, the upper end of the upper rod-shaped portion 35a is located below the upper end of the flow path 22a of the stem portion 22 and is positioned at a distance from the base end of the support portion 24a of the valve 24 which is located in the flow path 21a of the main body portion 21.

[0034] A spring 36 is positioned in the cylinder chamber 34 to bias the piston 32 upward. The piston 32 is held in a position where the upper stroke end position, i.e., the stem portion 22, is the first position, with the piston body 32b contacting the lower end of the support cylinder portion 13, by the force of the spring 36.

[0035] The pump 30 can also be configured with a forward / inverted switching mechanism 50. The forward / inverted switching mechanism 50 has a first cylindrical body 51 and a second cylindrical body 52. ​​The first cylindrical body 51 is fitted and fixed to the outside of the cylinder 31. Between the inner circumferential surface of the first cylindrical body 51 and the outer circumferential surface of the cylinder 31, an introduction passage 53 for liquid 4 is formed, which opens into the inside of the container body 2 inside the mouth 2a. A tube 54 extending toward the bottom of the container body 2 is connected to the lower end of the first cylindrical body 51. The second cylindrical body 52 is located inside the first cylindrical body 51 and is in communication with the tube 54. A flow path block 55 is located between the second cylindrical body 52 and the lower end of the cylinder 31. The flow path block 55 has a first communication passage 55a that connects the introduction passage 53 to the inside of the second cylindrical body 52, and a second communication passage 55b that connects the introduction passage 56, formed between the inner circumferential surface of the first cylindrical body 51 and the outer circumferential surface of the second cylindrical body 52, to the inlet 31a. The second cylindrical body 52 has a through hole 52a, through which it communicates with the introduction passage 56. The lower end of the first cylindrical body 51 is reduced in diameter, and a ball valve 57 is provided in this reduced-diameter portion to abut against the reduced-diameter portion and open and close the space between the tube 54 and the inside of the second cylindrical body 52. ​​In addition, the through hole 52a of the second cylindrical body 52 is provided in the reduced-diameter portion, and a ball valve 58 is provided above this reduced-diameter portion to abut against the reduced-diameter portion and open and close the communication between the introduction passage 53 and the through hole 52a.

[0036] The forward / inverted switching mechanism 50 having the above configuration can switch the inlet 31a of the cylinder 31 to communicate with the bottom side of the container body 2 through a tube 54 connected to the inlet 31a via the second communication passage 55b, introduction passage 56, through hole 52a and the inside of the second cylindrical body 52 when the trigger-type discharger 1 is in the upright position, and to communicate with the mouth 2a side of the container body 2 via the introduction passage 56, through hole 52a, the inside of the second cylindrical body 52, the first communication passage 55a, introduction passage 53 and the second communication passage 55b when the trigger-type discharger 1 is in the inverted position.

[0037] The trigger 40 has a V-shape and is rotatably (swinging) supported at one end by a pivot shaft 41 on the support wall portion 16 of the mounting member 10. The other end of the trigger 40 is an operating portion 42 that is pulled by the user. The operating portion 42 is located on the opposite side of the central axis O from the pivot shaft 41. The trigger 40 is also rotatably locked between the pivot shaft 41 and the operating portion 42 to the outer circumferential surface of the upper end portion of the stem portion 22 of the pressing body 20 by a pivot shaft 43.

[0038] In the trigger-type dispensing device 1 having the above configuration, when the user pulls the operating part 42 in the direction toward the mounting member 10, the pressing body 20 is driven by the trigger 40 and pushed down from a first position (position shown in Figure 1) to a second position (position shown in Figure 3). As shown in Figure 3, when the operating part 42 of the trigger 40 is pulled and the pressing body 20 is pushed down from the first position to the second position, the piston 32 moves downward together with the stem 22, thereby pressurizing the cylinder chamber 34 and causing the pump 30 to perform a dispensing operation. When the pump 30 performs a dispensing operation, the liquid 4 drawn from inside the container body 2 into the cylinder chamber 34 is pumped from the outlet 32a toward the flow paths 22a and 21a. When the pressure in the flow paths 22a and 21a exceeds a predetermined value, the valve 24 moves toward the nozzle 23 and opens, and the flow path 21a communicates with the discharge port 23a. As a result, the liquid 4 pumped from the pump 30 into the flow path 21a is discharged to the outside in a spray (mist) form from the discharge port 23a of the nozzle 23 while under pressure. When the push-down body 20 is pushed down from the first position to the second position, the upper end of the upper rod-shaped portion 35a comes into contact with the base end of the support portion 24a, pushing the support portion 24a toward the nozzle 23, and the valve 24 is opened. As a result, after the discharge of the liquid 4 is complete, the valve 24 is opened and the flow path 21a is in communication with the discharge port 23a, thus preventing residual pressure from remaining in the flow paths 22a, 21a and the cylinder chamber 34.

[0039] When the pull operation of the trigger 40's operating part 42 is released, as shown in Figure 1, the spring force of the spring 36 returns the piston 32, the pressing body 20, and the trigger 40 to their original positions. At this time, the upward movement of the piston 32 creates negative pressure in the cylinder chamber 34, and this negative pressure opens the check valve 33 and the ball valve 57, causing the liquid 4 inside the container body 2 to be discharged next. This liquid 4 is then drawn from the bottom side through the tube 54, the inside of the second cylindrical body 52, the through hole 52a, the introduction passage 56, and the second connecting passage 55b into the cylinder chamber 34 from the inlet 31a.

[0040] Furthermore, as shown in Figure 4, when the trigger-type dispensing device 1 having the above configuration is in an inverted position, the user pulls the operating part 42 in the direction toward the mounting member 10, and the pressing body 20 is driven by the trigger 40 to move from the first position to the second position (the position shown in Figure 4). At this point, the piston 32 moves together with the stem part 22 to narrow the cylinder chamber 34, thereby pressurizing the cylinder chamber 34 and causing the pump 30 to perform a dispensing operation. When the pump 30 performs a dispensing operation, as in the case of the upright position, the liquid 4 drawn from inside the container body 2 into the cylinder chamber 34 is pressurized and sent from the outlet 32a through the flow paths 22a and 21a to the nozzle 23, and discharged to the outside from the discharge port 23a of the nozzle 23.

[0041] When the trigger-type discharger 1 remains in an inverted position and the operation of the trigger 40's operating section 42 is released, the spring force of the spring 36 causes the piston 32, the pressing body 20, and the trigger 40 to return to their original positions. At this time, the upward movement of the piston 32 creates negative pressure in the cylinder chamber 34, and this negative pressure opens the check valve 33 and closes the upper end of the tube 54 by the ball valve 57. As a result, the liquid 4 inside the container body 2 is drawn into the cylinder chamber 34 from the inlet 31a via the introduction passage 53, the first connecting passage 55a, the inside of the second cylindrical body 52, the through hole 52a, the introduction passage 56, and the second connecting passage 55b, as the next liquid 4 to be discharged.

[0042] Thus, the trigger-type dispensing device 1 of this embodiment has a forward / inverted switching mechanism 50, which allows the liquid 4 inside the container body 2 to be dispensed to the outside from the discharge port 23a of the nozzle 23, regardless of whether the trigger-type dispensing device 1 is in an upright or inverted position.

[0043] As shown in Figure 2, the trigger-type dispenser 1 has vertical grooves 60 on the inner surface of the support cylinder portion 13 to form an air intake passage for relieving the negative pressure generated inside the container body 2 after the liquid 4 has been dispensed. At least one vertical groove 60 is required on the inner surface of the support cylinder portion 13, and multiple grooves 60 can be provided on the inner surface of the support cylinder portion 13 at intervals in the circumferential direction.

[0044] The vertical groove 60 extends from the lower end of the support cylinder portion 13 to a position below the upper end. That is, the vertical groove 60 does not reach the upper end of the support cylinder portion 13, and the inner circumferential surface on the upper end side of the support cylinder portion 13 is cylindrical without the vertical groove 60. The vertical groove 60 communicates with the inside of the container body 2 through the gap 61 between the cylinder 31 and the support cylinder portion 13, the gap 62 between the cylinder 31 and the fitting cylinder portion 12, and the through hole 31c provided in the flange portion 31b of the cylinder 31 as shown in Figure 5.

[0045] In this embodiment, the gap 62 is a groove for forming a gap, extending vertically on the inner circumferential surface of the fitting cylinder portion 12. The through hole 31c is tapered, gradually widening in diameter downwards. As shown in Figures 5 and 6, a rectangular groove 31d is formed on the upper surface of the flange portion 31b, extending radially inward from the through hole 31c. The rectangular groove 31d opens upward radially inward from the contact portion between the flange portion 14 of the mounting member 10 and the flange portion 31b of the cylinder 31. As a result, the through hole 31c, which opens below the flange portion 14, communicates with the gap 62 via the rectangular groove 31d.

[0046] As shown in Figure 2, a first O-ring 70 made of synthetic rubber is fitted to the outer circumferential surface of the piston body 32b of the piston 32. More specifically, an annular groove 32d is provided on the outer circumferential surface of the piston body 32b, and the first O-ring 70 is fitted inside this groove 32d. The first O-ring 70 is in contact with the inner circumferential surface of the cylinder 31, and provides a liquid-tight seal between the outer circumferential surface of the piston body 32b and the inner circumferential surface of the cylinder 31.

[0047] Furthermore, a second O-ring 71 made of synthetic rubber is fitted to the outer circumferential surface of the stem portion 22. More specifically, an annular groove 22b is provided on the outer circumferential surface of the stem portion 22, and the second O-ring 71 is fitted inside this groove 22b. When the pressing body 20 is in the first position, the second O-ring 71 abuts against the inner circumferential surface of the support cylinder portion 13 above the vertical groove 60 over its entire circumference, and when the pressing body 20 is in the second position, the second O-ring 71 abuts against the inner circumferential surface of the support cylinder portion 13 in the portion where the vertical groove 60 is provided.

[0048] The first O-ring 70 and the second O-ring 71 are preferably made of fluororubber or acrylonitrile butadiene rubber (NBR), respectively.

[0049] Furthermore, as shown in Figure 5, an on-off valve 80 is provided below the flange portion 31b of the cylinder 31. In this embodiment, the on-off valve 80 is made of fluororubber. The on-off valve 80 is made of synthetic rubber that is elastically deformable so as to contact the lower surface of the flange portion 31b in an elastically deformed state to close the through hole 31c, and to move away from the flange portion 31b to open the through hole 31c. In this embodiment, the on-off valve 80 is made of fluororubber. More specifically, the on-off valve 80 has a cylindrical portion 81 that is fitted and fixed to the outer circumferential surface of the cylinder 31, and a valve body 82 that is in the form of a film extending radially outward from the outer circumferential surface of the cylindrical portion 81 and is elastically deformable in the vertical direction, with the valve body 82 contacting the lower surface of the flange portion 31b in an elastically deformed downward state. Below the valve body 82, a ring-shaped seal body 83 is arranged at a predetermined interval. The seal body 83 provides a liquid-tight seal between the upper end of the opening portion 2a and the flange portion 31b. The inner circumferential surface of the seal body 83 is in contact with the outer circumferential surface of the cylindrical portion 81. In addition, at least one communication groove 81a is provided on the outer circumferential surface of the cylindrical portion 81, and the space above the seal body 83 communicates with the inside of the container body 2 through the communication groove 81a.

[0050] After the operating part 42 of the trigger 40 is pulled and the liquid 4 is discharged to the outside from the discharge port 23a of the nozzle 23, when the pulling operation of the operating part 42 is released, the liquid 4 inside the container body 2 is drawn into the cylinder chamber 34 and the inside of the container body 2 becomes negative pressure. As shown in Figure 7, the valve body 82 is pulled by this negative pressure and elastically deforms downward, separating from the lower surface of the flange portion 31b and opening the on-off valve 80. At this time, as shown in Figure 3, the second O-ring 71 attached to the outer circumferential surface of the stem portion 22 abuts against the inner circumferential surface of the support cylinder portion 13 in the portion where the vertical groove 60 is provided, so the vertical groove 60 is in communication with the outside through the gap between the support cylinder portion 13 and the stem portion 22. Therefore, when negative pressure is created inside the container body 2, as shown in Figures 3 and 7, outside air is introduced into the container body 2 through the vertical groove 60, gap 61, gap 62, rectangular groove 31d, through hole 31c, and connecting groove 81a, thereby relieving the pressure inside the container body 2.

[0051] As described above, the trigger-type dispensing device 1 of this embodiment has a configuration in which the piston 32 constituting the pump 30 has a first O-ring 70 made of synthetic rubber attached to the outer circumferential surface of the piston body 32b, which contacts the inner circumferential surface of the cylinder 31. Therefore, even when the liquid 4 contained in the container body 2 is retort sterilized (pressure-heat sterilization) by an autoclave or the like while the trigger-type dispensing device 1 is attached to the container body 2 containing the liquid 4, the sealing performance of the piston 32 to the cylinder 31 is ensured by the first O-ring 70, and the pump 30 will not malfunction during use. In this way, the trigger-type dispensing device 1 of this embodiment is designed to withstand retort sterilization (pressure-heat sterilization) by an autoclave or the like by having a first O-ring 70 made of synthetic rubber attached to the outer circumferential surface of the piston body 32b, which contacts the inner circumferential surface of the cylinder 31.

[0052] Furthermore, if the first O-ring 70 is made of fluororubber or acrylonitrile butadiene rubber (NBR), the sliding and sealing properties of the first O-ring 70 with respect to the cylinder 31 can be ensured while further improving the heat resistance of the first O-ring 70. This makes it possible to more reliably suppress deformation of the first O-ring 70 when the liquid 4 stored in the container body 2 is retorted (pressure-heat sterilization) using an autoclave or the like, and more effectively prevent the pump 30 from malfunctioning during use.

[0053] Furthermore, as described above, the trigger-type dispensing device 1 of this embodiment is configured such that a second O-ring 71 made of synthetic rubber is attached to the outer circumferential surface of the stem portion 22, and when the pressing body 20 is in the first position, it contacts the inner circumferential surface of the support cylinder portion 13 over its entire circumference, above the vertical groove 60. Therefore, when the trigger-type dispensing device 1 is attached to the container body 2 containing the liquid 4, and the liquid 4 stored in the container body 2 is subjected to retort sterilization (pressure heating sterilization) using an autoclave or the like, the vertical groove 60 communicating with the inside of the container body 2 is closed to the outside by the second O-ring 71, thereby preventing a decrease in the airtightness of the container body 2.

[0054] Furthermore, if the second O-ring 71 is made of fluororubber or acrylonitrile butadiene rubber (NBR), the sliding and sealing properties of the second O-ring 71 with respect to the support cylinder portion 13 can be ensured while further improving the heat resistance of the second O-ring 71. This makes it possible to more reliably suppress deformation of the second O-ring 71 when the liquid 4 stored in the container body 2 is retorted (pressure-heat sterilization) using an autoclave or the like, thereby more reliably preventing a decrease in the airtightness of the container body 2.

[0055] Furthermore, as described above, in the trigger-type dispensing device 1 of this embodiment, the through hole 31c provided in the flange portion 31b is closed by an on-off valve 80 provided below the flange portion 31b and in contact with the flange portion 31b in an elastically deformed state. Therefore, when retort sterilization (pressure heating sterilization) of the liquid 4 stored in the container body 2 by an autoclave or the like, it is possible to suppress the opening of the on-off valve 80 due to the air inside the vertical grooves 60 and gaps 61 and 62 being heated and expanding, thereby more reliably preventing a decrease in the airtightness of the container body 2.

[0056] Furthermore, if the shut-off valve 80 is made of fluororubber, the heat resistance of the shut-off valve 80 can be further enhanced, making it possible to more reliably suppress deformation of the shut-off valve 80 due to heating when retort sterilization (pressure heating sterilization) of the liquid 4 stored in the container body 2 using an autoclave or the like, and to more reliably prevent a decrease in the airtightness of the container body 2.

[0057] Furthermore, in the trigger-type dispensing device 1 of this embodiment, the through hole 31c provided in the flange portion 31b is closed by an on-off valve 80 provided below the flange portion 31b and in contact with the flange portion 31b in an elastically deformed state. Therefore, even when the trigger-type dispensing device 1 is in an inverted position with the forward / inverted switching mechanism 50 installed, the liquid 4 can be prevented from leaking out of the vertical groove 60.

[0058] In the trigger-type dispensing device 1 of this embodiment, the main components other than the first O-ring 70, the second O-ring 71, and the on-off valve 80 are also made of materials that have heat resistance of approximately 120°C. More specifically, the nozzle 23, valve 24, trigger 40, piston 32 (piston body 32b and fixing cylinder part 32c), cylinder 31, first cylinder 51, and second cylinder 52 are each made of polypropylene (PP). In addition, the check valve 33, ball valve 57, and ball valve 58 are each made of stainless steel (SUS). Furthermore, the packing 26 and seal body 83 are each made of fluororubber or acrylonitrile butadiene rubber. Furthermore, the spring member 25 is a metal spring. As a result, the trigger-type dispensing device 1 can be made suitable for retort sterilization (pressure heating sterilization) using an autoclave or the like.

[0059] The present invention is not limited to the embodiments described above, and can be modified in various ways without departing from its spirit.

[0060] For example, in the above embodiment, the trigger-type dispensing device 1 is configured to include a forward / inverted switching mechanism 50, but it may also be configured without the forward / inverted switching mechanism 50. [Explanation of symbols]

[0061] 1. Trigger-type dispensing device 2. Container body 2a Mouth 3 Discharge container 4 liquid 10 Mounting member 11 Cap section 12 Fitting cylinder 13 Support cylinder part 14 Flange section 15 Tapered section 16 Support wall section 17 Connecting Ribs 20 Pressing body 21 Main body 21a Flow channel 21b Valve housing 22 Stem section 22a Flow channel 22b Groove 23 nozzles 23a Discharge port 23b Nozzle Tip 24 valves 24a Support part 25 Spring component 26 Packing 30 pumps 31 cylinders 31a Inlet 31b Flange section 31c through hole 31d rectangular groove 32 pistons 32a Outlet 32b Piston body 32c Fixing cylinder part 32d groove 33 Check valve 34 Cylinder Chamber 35 Piston Guide 35a Upper rod-shaped part 36 Springs 40 Trigger 41. Rotary shaft 42 Operation section 43. Rotating shaft 50. Upright / Inverted Switching Mechanism 51 First cylinder 52 Second cylinder 52a through hole 53 Introductory path 54 tubes 55 Flow channel block 55a First Concourse 55b Second connecting corridor 56 Introductory path 57 Ball valve 58 Ball valve 60 vertical grooves 61 gap 62 gaps 70 First O-ring 71 Second O-ring 80 Shut-off valve 81 Cylinder part 81a Communication groove 82 Valve body 83 Seal body O center axis

Claims

1. A mounting member comprising a cap portion attached to the mouth of the container body, a fitting cylinder portion connected to the upper part of the cap portion, and a support cylinder portion connected to the upper part of the fitting cylinder portion, A pressing body having a main body portion having a flow path inside and a nozzle connected to the flow path attached thereto, and a stem portion connected to the main body portion, the pressing body being supported by the support cylinder portion on the stem portion so as to be movable in the vertical direction between a first position and a second position lower than the first position, A pump comprising: a cylinder having an inlet at its lower end and fitted and fixed inside the fitting cylindrical portion; a piston having an outlet connected to the flow path on its axis and mounted at the lower end of the stem portion and slidably positioned inside the cylinder; and a check valve for opening and closing the inlet; The mounting member is rotatably supported by a pivot shaft, and has a trigger that is locked to the pressing body between the pivot shaft and the operating part, A trigger-type dispensing device configured such that when the trigger is pulled, the trigger pushes the pressing body down from a first position to a second position, causing the pump to perform a discharge operation, and the liquid inside the container body is discharged from the inlet through the flow path to the outside through the nozzle, A vertical groove is provided on the inner circumferential surface of the support cylinder portion, extending from the lower end of the support cylinder portion to a position below the upper end, and communicating with the inside of the container body through the gap between the cylinder and the support cylinder portion and the gap between the cylinder and the fitting cylinder portion. A first O-ring, formed of synthetic rubber, is mounted on the outer circumferential surface of the piston and in contact with the inner circumferential surface of the cylinder, A trigger-type dispensing device characterized by having a second O-ring, which is made of synthetic rubber and is attached to the outer circumferential surface of the stem portion, and which contacts the inner circumferential surface of the support cylinder portion over its entire circumference above the vertical groove when the pressing body is in the first position, and which contacts the inner circumferential surface of the support cylinder portion in the portion where the vertical groove is provided when the pressing body is in the second position.

2. The trigger-type dispensing device according to claim 1, wherein the first O-ring and the second O-ring are made of fluororubber or acrylonitrile butadiene rubber, respectively.

3. A flange portion is integrally provided on the outer surface of the cylinder and is sandwiched between the opening and the mounting member, The flange portion is provided with a through hole that connects the vertical groove with the inside of the container body, A trigger-type discharge device according to claim 1 or 2, comprising: an on / off valve provided below the flange portion, which, in an elastically deformed state, contacts the flange portion to close the through hole, and is elastically deformable to move away from the flange portion to open the through hole.

4. The trigger-type dispensing device according to claim 3, wherein the on / off valve is made of fluororubber.

5. The trigger-type dispensing device according to claim 1 or 2, having a forward / inverted switching mechanism that, when the trigger-type dispensing device is in an upright position, connects the inlet to the bottom side of the container body through a tube connected to the inlet, and when the trigger-type dispensing device is in an inverted position, connects the inlet to the mouth side of the container body.

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