Triggered liquid jet

Abstract

The present invention provides a trigger-type liquid injector (1) comprising an injector body (2) mounted on a container body (A) and a nozzle component (3) having an injection hole (4). The injector body comprises: a longitudinal supply cylinder (10); a trigger mechanism (50) having a trigger part (51); an accumulator cylinder (90) which, by moving the trigger part rearward, supplies liquid that has passed through the longitudinal supply cylinder to the interior; and an accumulator plunger (80) which is movably disposed in the accumulator cylinder and moves to one side and is forceped to the other side as liquid is supplied into the accumulator cylinder. The accumulator cylinder is configured to protrude further rearward than the longitudinal supply cylinder. A displacement suppression part (150) is provided between the rear cylinder part (97) protruding further rearward than the longitudinal supply cylinder and the longitudinal supply cylinder to suppress the displacement of the rear cylinder part relative to the longitudinal supply cylinder.

Description

Technical Field

[0001] This invention relates to a trigger-type liquid injector.

[0002] This application claims priority based on Japanese Patent Application No. 2020-199026 filed on November 30, 2020, and Japanese Patent Application No. 2020-217401 filed on December 25, 2020, the contents of which are incorporated herein by reference. Background Technology

[0003] A trigger-type liquid ejector is known to draw liquid from a container and eject it through a spray nozzle by operating a trigger.

[0004] As such a trigger-type liquid injector, for example as shown in Patent Document 1 below, there is a known trigger-type liquid injector having an injector body and a nozzle component, wherein the injector body is mounted on a container containing liquid, and the nozzle component is formed with a spray hole for ejecting liquid.

[0005] The injector body mainly comprises: a longitudinal supply cylinder that draws liquid from a container; a trigger that is configured to move rearward when a forward force is applied, and the liquid is ejected from the longitudinal supply cylinder toward the injection hole by the rearward movement; an accumulator cylinder that supplies the liquid that has passed through the longitudinal supply cylinder to its interior by the rearward movement of the trigger; and an accumulator plunger that is configured to move within the accumulator cylinder, moving rearward as liquid is supplied into the accumulator cylinder, and being forced forward by a force-applying component.

[0006] In the aforementioned trigger-type liquid injector, by operating the trigger, liquid can be accumulated in the accumulator cylinder while being ejected from the injection port. Furthermore, liquid can be ejected using the accumulator plunger even without operating the trigger. Thus, continuous liquid injection is possible.

[0007] Existing technical documents

[0008] Patent documents

[0009] Patent Document 1: Japanese Patent Application Publication No. 2017-213497 Summary of the Invention

[0010] Technical issues

[0011] Trigger-type liquid injectors equipped with the aforementioned accumulator cylinder are sometimes formed to be longer in the longitudinal direction in order to ensure sufficient internal volume (capacity) of the accumulator cylinder. Specifically, the accumulator cylinder is sometimes formed to extend further rearward than the longitudinal supply cylinder above it. Therefore, external forces, such as falling impacts or external contact, can easily act on the accumulator cylinder in an amount equivalent to the accumulator cylinder protruding further rearward than the longitudinal supply cylinder.

[0012] In particular, when the trigger-type liquid injector is dropped, the accumulator cylinder is positioned higher than the longitudinal supply cylinder. Therefore, the accumulator cylinder tends to tilt downwards, making it more susceptible to impact from the drop. Consequently, the accumulator cylinder may be displaced (deformed) by bending around the connection point between the accumulator cylinder and the longitudinal supply cylinder due to the rotational torque caused by the drop impact, potentially leading to damage to the accumulator cylinder.

[0013] The present invention was made in view of the following circumstances, and its object is to provide a trigger-type liquid injector with excellent impact resistance.

[0014] Technical solution

[0015] One aspect of the present invention provides a trigger-type liquid injector comprising: an injector body mounted on a container containing liquid; and a nozzle component mounted on the front end of the injector body and forming a spray hole for spraying liquid forward. The injector body includes: a longitudinal supply cylinder extending vertically and drawing liquid from the container; a trigger mechanism having a trigger portion disposed in front of the longitudinal supply cylinder such that it can move rearward when a forward force is applied, the rearward movement of the trigger portion causing liquid to flow from the longitudinal supply cylinder toward the spray hole; and a accumulator cylinder, which, through the rearward movement of the trigger portion, allows liquid to flow through... Liquid is supplied to the interior of the longitudinal supply cylinder; and an accumulation plunger is disposed in the accumulation cylinder in such a way that it can move axially along the central axis of the accumulation cylinder, moves toward one side of the axial direction as liquid is supplied into the accumulation cylinder, and is forced toward the other side, the accumulation cylinder being disposed above the longitudinal supply cylinder and intersecting the central axis of the longitudinal supply cylinder, and being configured to protrude further rearward than the longitudinal supply cylinder, a displacement suppression portion is provided between the rear cylinder portion protruding further rearward than the longitudinal supply cylinder and the longitudinal supply cylinder to suppress the displacement of the rear cylinder portion relative to the longitudinal supply cylinder.

[0016] In this case, by operating the trigger to move it rearward, liquid can flow from the longitudinal supply cylinder toward the injection hole side. This allows the liquid to be ejected forward through the injection hole of the nozzle component.

[0017] Furthermore, it can simultaneously supply liquid into the accumulator cylinder through the longitudinal supply section and eject the liquid through the injection hole, while also pressurizing the accumulator cylinder. Therefore, it can push the accumulator plunger axially against forward force and move the accumulator plunger axially while ejecting liquid. Thus, whenever the trigger is pulled, the accumulator plunger moves axially, thereby accumulating (filling) liquid in the accumulator cylinder while ejecting liquid.

[0018] It should be noted that after filling the accumulator with liquid, if the operation of the trigger is stopped, although the supply of liquid to the accumulator via the longitudinal supply cylinder ceases, the accumulator plunger begins to move back to its original position axially to the other side. This allows the liquid filled into the accumulator to be squeezed out of the accumulator towards the injection port and ejected from the injection port. Therefore, continuous liquid ejection is possible.

[0019] Specifically, a displacement suppression section is provided between the rear cylinder section and the longitudinal supply cylinder section in the accumulator cylinder to suppress displacement of the rear cylinder section relative to the longitudinal supply cylinder section. Therefore, even if external forces such as impacts caused by falling or contact with the outside are applied to the accumulator cylinder, displacement (deformation) of the rear cylinder section in the vertical direction can be suppressed. Even if external forces such as impacts from falling are applied to the accumulator cylinder, the displacement suppression section can suppress displacement of the rear cylinder section in the vertical direction, such as bending based on the connection between the rear cylinder section and the longitudinal supply cylinder section, due to rotational torque caused by external forces. As a result, rigidity against unexpected external forces can be improved, and the impact resistance of the trigger-type liquid injector can be improved.

[0020] As a result, a high-quality trigger-type liquid injector with strong rigidity against falling impacts and contact impacts can be designed. Furthermore, by improving impact resistance, for example, by making the rear cylinder section longer and positioned further rearward than the longitudinal supply cylinder section, the internal volume (capacity) within the accumulator cylinder can be further ensured. Therefore, liquid can be further accumulated within the accumulator cylinder, enabling a trigger-type liquid injector suitable for continuous injection.

[0021] The displacement suppression part may have reinforcing ribs, which are integrally formed in the longitudinal supply cylinder and the rear cylinder in such a way that they connect the longitudinal supply cylinder and the rear cylinder as a single unit.

[0022] In this case, by integrally forming reinforcing ribs on the longitudinal supply cylinder and the rear cylinder, the longitudinal supply cylinder and the rear cylinder are connected as one unit, thus effectively improving the rigidity of the connection between the longitudinal supply cylinder and the rear cylinder. Therefore, even when external forces such as falling impacts act on the accumulator cylinder, the vertical displacement of the rear cylinder with the connection between the rear cylinder and the longitudinal supply cylinder as the reference point can be further effectively suppressed.

[0023] In particular, it can effectively suppress either the downward displacement of the rear cylinder section due to the external force acting on the accumulator cylinder, which is based on the connection between the rear cylinder section and the longitudinal supply cylinder section, or the upward displacement.

[0024] The displacement suppression part may include a reinforcing body, which is installed on the longitudinal supply cylinder and the rear cylinder. The reinforcing body may include: a first reinforcing body, which is installed on the longitudinal supply cylinder from the rear and holds the longitudinal supply cylinder; and a second reinforcing body, which is integrally formed with the first reinforcing body and installed on the rear cylinder from below and holds the rear cylinder.

[0025] In this case, the overall rigidity can be improved by using a reinforcing member that is separate from the longitudinal supply cylinder and the rear cylinder. Specifically, by installing a first reinforcing member from the rear onto the longitudinal supply cylinder and a second reinforcing member from below onto the rear cylinder, the longitudinal supply cylinder and the rear cylinder can be strengthened by using the reinforcing member to connect them as a single unit.

[0026] In particular, due to the use of separate reinforcing elements, it is difficult to affect the formability of the longitudinal supply cylinder and the rear cylinder section, allowing for reinforcement while appropriately maintaining the liquid ejection performance. Furthermore, because the reinforcing elements can be designed arbitrarily and with a high degree of freedom, displacement of the rear cylinder section can be easily and effectively suppressed.

[0027] The longitudinal supply cylinder may have an outer cylinder integrally formed on the storage cylinder body and an inner cylinder fitted inside the outer cylinder. An upper rib may be integrally formed on the outer peripheral surface of the upper end of the storage cylinder body. The upper rib protrudes upward and is disposed on the central axis of the longitudinal supply cylinder and extends along the axial direction. The upper rib may have a first wall surface facing the other side of the axial direction and inclined in a manner that extends upward from the outer peripheral surface of the storage cylinder body toward one side of the axial direction. A first curved surface may be formed at the connection between the first wall surface and the outer peripheral surface of the storage cylinder body. When the storage cylinder body is viewed from the side, the first curved surface is recessed toward the axial direction. The first curved surface may be formed as a concave curved surface with a radius of curvature of 1.5 mm or more when the storage cylinder body is viewed from the side.

[0028] In this case, when assembling the trigger-type liquid injector, the longitudinal supply cylinder and the accumulator can be assembled with good set-in precision because an upper rib is formed in the accumulator body.

[0029] That is, since an upper rib is formed on the outer peripheral surface of the upper end of the accumulator body along the central axis of the longitudinal supply cylinder, the upper rib can appropriately bear the load transmitted to the accumulator body from the inner cylinder when the inner cylinder is inserted into the outer cylinder integrally formed with the accumulator body by means of plugging or the like. Therefore, the longitudinal supply cylinder and the accumulator body can be assembled with good fit and high precision.

[0030] Furthermore, the first wall surface of the upper rib is not designed to be perpendicular to the outer peripheral surface of the accumulator body, such as at a right angle, but rather is designed to be inclined to one side towards the axial direction. In addition, a first curved surface is formed at the connection between the first wall surface and the outer peripheral surface of the accumulator body. Therefore, even if the accumulator body is subjected to impact forces, such as those caused by falling or contact with the outside, and the accumulator body undergoes displacement in the vertical direction due to the resulting rotational torque, defects such as cracking at the connection between the accumulator body and the first wall surface can be suppressed. For example, if the first wall surface is connected at a right angle to the outer peripheral surface of the accumulator body, cracking may occur at the connection when the accumulator body is displaced vertically due to falling impacts. In contrast, since the first wall surface itself is an inclined surface, and it is connected to the outer peripheral surface of the accumulator body via a first curved surface, the impact force can be mitigated, making it difficult for the aforementioned defects to occur.

[0031] Furthermore, since the first curved surface is formed into a concave surface with a radius of curvature of 1.5 mm or more, even if the accumulator cylinder is displaced in the vertical direction due to falling impacts, it is possible to effectively suppress defects such as cracking at the connection between the accumulator cylinder and the first wall surface. It should be noted that by setting the radius of curvature to 2 mm or more, a greater effect can be easily achieved.

[0032] In summary, this design improves rigidity against unexpected external forces and enhances the impact resistance of the trigger-type liquid injector. As a result, a high-quality trigger-type liquid injector with strong rigidity against drop impacts and contact impacts can be developed. Furthermore, because of the improved impact resistance, for example, by shaping the accumulator body to be longer and positioned further axially than the longitudinal supply cylinder, the internal volume (capacity) within the accumulator body can be further ensured. This allows for greater liquid accumulation within the accumulator body, enabling the design of a trigger-type liquid injector suitable for continuous injection.

[0033] When viewed from the side, the inclination angle of the first wall surface relative to the outer peripheral surface of the storage cylinder can be set to 45 degrees or more.

[0034] In this configuration, the first wall surface is inclined at an angle of 45 degrees or more but less than 90 degrees relative to the outer circumferential surface of the accumulator cylinder. This ensures the rib height of the upper rib and further enhances its rigidity. Consequently, during assembly, the load transmitted to the accumulator cylinder from the inner cylinder can be more reliably withstood, and the longitudinal supply cylinder and accumulator cylinder can be assembled with greater precision and better fit. Furthermore, the increased rigidity of the upper rib effectively suppresses defects such as cracking at the connection between the accumulator cylinder and the first wall surface.

[0035] The upper rib may have a second wall surface facing one side of the axial direction and inclined in a manner that extends upward from the outer peripheral surface of the accumulator body toward the other side of the axial direction. A second face surface may be formed at the connection between the second wall surface and the outer peripheral surface of the accumulator body, and the second face surface is recessed toward the other side of the axial direction when the accumulator body is viewed from the side.

[0036] In this configuration, an upper rib is formed with both a first wall surface facing the opposite side of the axial direction and a second wall surface facing the axial direction as inclined surfaces. Furthermore, a first curved surface is formed between the first wall surface and the outer peripheral surface of the accumulator body, and a second curved surface is formed between the second wall surface and the outer peripheral surface of the accumulator body. Therefore, even if the accumulator body displaces in either the vertical or horizontal direction due to, for example, a falling impact, it can more effectively suppress defects such as cracking in the upper rib and improve the strength of the upper rib relative to the impact force.

[0037] Technical effect

[0038] The trigger-type liquid injector according to the present invention can improve impact resistance. Attached Figure Description

[0039] Figure 1 This is a longitudinal cross-sectional view showing a first embodiment of the trigger-type liquid injector of the present invention.

[0040] Figure 2 It is Figure 1 The diagram shows a magnified longitudinal cross-sectional view of the periphery of the accumulator plunger in the trigger-type liquid injector.

[0041] Figure 3 This is a diagram showing a variation of the first embodiment of the trigger-type liquid injector, and is a side view of the periphery of the connection portion between the longitudinal supply cylinder and the accumulator plunger.

[0042] Figure 4 yes Figure 3 The diagram shows a longitudinal cross-section of a trigger-type liquid injector.

[0043] Figure 5 This is a longitudinal cross-sectional view showing another variation of the first embodiment of the trigger-type liquid injector.

[0044] Figure 6 This is a longitudinal cross-sectional view showing a second embodiment of the trigger-type liquid injector of the present invention.

[0045] Figure 7 It is Figure 6 The longitudinal cross-sectional view of the accumulator cylinder and accumulator plunger is shown as an enlarged view of their periphery.

[0046] Figure 8 It is Figure 6 The image shows an enlarged longitudinal cross-sectional view of the inner cylinder and the periphery of the tube.

[0047] Figure 9 It is Figure 6 The image shows a magnified longitudinal cross-sectional view of the upper rib.

[0048] Figure 10 Looking from the front Figure 9 The front view of the upper rib shown.

[0049] Figure 11 Viewed from above Figure 9 The top view of the upper rib shown.

[0050] Figure 12 Viewed from below Figure 8 The top view of the inner cylinder is shown.

[0051] Figure 13 Is Figure 6 The diagram shows the assembly of a trigger-type liquid injector, in which the inner cylinder is inserted into the outer cylinder, which is integrally formed within the accumulator cylinder.

[0052] Symbol Explanation

[0053] A container body

[0054] 1 trigger-type liquid injector

[0055] 2. Injector body

[0056] 3 Nozzle components

[0057] 4 injection holes

[0058] 10 Longitudinal supply cylinder

[0059] 11 Injection tube section

[0060] 12 outer cylinder

[0061] 13 Inner Tube

[0062] 50 trigger mechanism

[0063] 51 trigger section

[0064] 52 main piston

[0065] 53 main cylinder

[0066] 80 Accumulation Plunger

[0067] 90 Accumulator Cylinder

[0068] 97 Rear cylinder section (rear cylinder block section)

[0069] 150 displacement suppression section

[0070] 151 Reinforcing Rib

[0071] 155 reinforced body

[0072] 156 First Enhancement Body

[0073] 157 Second Enhancement Body

[0074] 160 Upper Rib

[0075] 161 front wall (first wall)

[0076] 162 Rear wall (second wall)

[0077] 166 First Song Facial

[0078] 167 Second Movement Facial Detailed Implementation

[0079] (First Implementation)

[0080] The following is for reference Figure 1 and Figure 2 A first embodiment of the trigger-type liquid injector of the present invention will be described. In this embodiment, an example will be described where the trigger-type liquid injector is installed in the ejection container of the container body.

[0081] like Figure 1 As shown, the trigger-type liquid injector 1 of this embodiment includes: an injector body 2, which is installed in a container body A containing liquid; and a nozzle component 3, which has a spray hole 4 for spraying liquid and is installed in the injector body 2.

[0082] It should be noted that, unless otherwise specified, all structural components of the trigger-type liquid injector 1 are designed to be molded using synthetic resin.

[0083] (Injector body)

[0084] The injector body 2 mainly comprises a longitudinal supply cylinder 10, a mounting cover 14, an injection cylinder 11, a trigger mechanism 50, an accumulator cylinder 90, a support component 60, an accumulator plunger 80, a force application component 81, a ball valve 19, an accumulator valve 20, and a cover 100.

[0085] In this embodiment, the central axis of the longitudinal supply cylinder 10 is designated as axis O1. The container body A side along axis O1 is called the lower side, and the opposite side is called the upper side. The direction along axis O1 is called the up-down direction. In addition, when viewed from above in the up-down direction, the direction that intersects axis O1 is called the front-back direction, and the direction that is orthogonal to both the up-down and front-back directions is called the left-right direction.

[0086] Furthermore, in this embodiment, the central axis of the accumulator cylinder 90 is designated as axis O2. In this embodiment, axis O2 extends in the front-rear direction. Therefore, in this embodiment, the front-rear direction corresponds to the axial direction along the central axis of the accumulator cylinder 90.

[0087] In this embodiment, "rear" corresponds to one side along the axial direction of the central axis of the accumulator cylinder 90, and "front" corresponds to the other side along the axial direction of the central axis of the accumulator cylinder 90. The axial direction along axis O2 may not be consistent with the front-rear direction.

[0088] The longitudinal supply cylinder 10 extends vertically to draw liquid from the container body A. The longitudinal supply cylinder 10 has a top-shaped outer cylinder 12 and an inner cylinder 13 fitted inside the outer cylinder 12. The axis O1 of the longitudinal supply cylinder 10, which is composed of the outer cylinder 12 and the inner cylinder 13, is located further rearward than the container axis of the container body A.

[0089] The outer cylinder 12 has: a large diameter portion 12a; a small diameter portion 12b disposed above the large diameter portion 12a and having a smaller diameter than the large diameter portion 12a; and an annular connecting portion 12c that connects the upper end of the large diameter portion 12a to the lower end of the small diameter portion 12b.

[0090] The upper end of the large-diameter portion 12a is formed as a small diameter relative to a portion of the large-diameter portion 12a located further below this upper end. Therefore, the outer circumference of the upper end of the large-diameter portion 12a is recessed throughout its entire circumference and no ribs or the like are provided. The small-diameter portion 12b is formed as a topped cylinder and is coaxially arranged with the axis O1. Figure 2 As shown, the top wall portion 12d of the small diameter portion 12b is integrally formed with the accumulating cylinder body 90. Thus, the outer cylinder 12 constituting the longitudinal supply cylinder portion 10 is integrally formed with the accumulating cylinder body 90.

[0091] like Figure 1 As shown, the inner cylinder 13 has: a large-diameter portion 13a; a small-diameter portion 13b disposed above the large-diameter portion 13a and having a smaller diameter than the large-diameter portion 13a; and an annular connecting portion 13c that connects the upper end of the large-diameter portion 13a to the lower portion of the small-diameter portion 13b. The small-diameter portion 13b is disposed radially inside the large-diameter portion 13a. The annular connecting portion 13c connects the inner circumferential surface of the large-diameter portion 13a to the outer circumferential surface of the small-diameter portion 13b radially.

[0092] The large-diameter portion 13a is disposed within the large-diameter portion 12a of the outer cylinder 12. The upper end of the large-diameter portion 13a is fitted into the upper end of the large-diameter portion 12a of the outer cylinder 12. The upper end of the large-diameter portion 13a is in full circumferential contact with the inner circumferential surface of the large-diameter portion 12a of the outer cylinder 12. Thus, the outer circumferential surface of the upper end of the large-diameter portion 13a and the inner circumferential surface of the upper end of the large-diameter portion 12a of the outer cylinder 12 are sealed throughout the entire circumference (so-called surface seal).

[0093] The lower end of the large-diameter portion 13a protrudes further downward than the large-diameter portion 12a of the outer cylinder 12. The lower end of the large-diameter portion 13a fits into the inner side of the opening A1 of the container body A. A ring-shaped protruding edge 13d is formed in the portion of the large-diameter portion 13a that protrudes downward from the large-diameter portion 12a of the outer cylinder 12, protruding radially outward toward the large-diameter portion 13a. The protruding edge 13d is disposed within the upper end of the mounting cover 14 that is mounted (e.g., screwed) to the opening A1 of the container body A, and is locked in place by the upper end of the mounting cover 14 in a manner that allows it to rotate freely about its axis. The protruding edge 13d is held vertically by the upper end of the mounting cover 14 and the upper opening edge of the opening A1 of the container body A.

[0094] The small-diameter portion 13b is coaxially disposed with the axis O1 and is formed into a cylindrical shape with openings in both the vertical and horizontal directions. The small-diameter portion 13b is disposed inside the small-diameter portion 12b of the outer cylinder 12. It should be noted that the upper opening edge of the small-diameter portion 13b is slightly downward from the top wall portion 12d of the outer cylinder 12. The upper part of a tube 15 extending in the vertical direction and drawing liquid from the container body A is fitted inside the lower part of the small-diameter portion 13b. It should be noted that the lower opening of the tube 15 is located at the bottom of the container body A (not shown).

[0095] A gap S1 is provided in the vertical direction between the upper surface of the annular connecting part 13c and the lower surface of the annular connecting part 12c of the outer cylinder 12.

[0096] like Figure 2 As shown, a valve seat portion 13e is formed on the inner circumferential surface of the inner cylinder 13. In the illustrated example, the valve seat portion 13e is formed by a step such that the inner diameter of the portion of the inner cylinder 13 located above the valve seat portion 13e is larger than the inner diameter of the portion located below the valve seat portion 13e. The accumulator valve 20 sits on the upper surface of the valve seat portion 13e.

[0097] like Figure 1 As shown, a cylindrical support portion 16 is provided on the inner circumferential surface of the inner cylinder 13, located lower than the valve seat portion 13e and higher than the upper end of the pipe 15. The outer diameter of the support portion 16 is smaller than the inner diameter of the inner cylinder 13. The support portion 16 is coaxially arranged with the axis O1 and protrudes upward from the inner circumferential surface of the inner cylinder 13. A ball valve 19 is arranged at the upper opening edge of the support portion 16 in a manner that allows it to face upward away from the valve seat.

[0098] A recycling passage 17 is provided between the outer cylinder 12 and the inner cylinder 13, positioned further back than the axis O1. The recycling passage 17 extends vertically, opening at the top and closing at the bottom. That is, the recycling passage 17 is designed to be closed at the bottom.

[0099] Specifically, the recovery passage 17 is configured as a longitudinal groove formed on the inner circumferential surface of the small-diameter portion 12b of the outer cylinder 12. The recovery passage 17 is provided along the entire vertical length of the small-diameter portion 12b. The lower end of the recovery passage 17 is closed from below by an annular connecting portion 13c in the inner cylinder 13. The lower end of the recovery passage 17 is connected via a connecting passage 17a (see reference 17a). Figure 2 It is connected to the connection path 18 described later, and is connected to the container body A through the connection opening 18a.

[0100] It should be noted that the recycling passage 17 can also be, for example, a longitudinal groove formed on the outer peripheral surface of the inner cylinder 13. In addition, the recycling passage 17 can also be formed by combining longitudinal grooves formed on the outer cylinder 12 and the inner cylinder 13 respectively.

[0101] A connecting passage 17a is provided between the outer cylinder 12 and the inner cylinder 13. The connecting passage 17a is a passage connecting the recovery passage 17 to the connecting passage 18 (described later), and is formed to extend circumferentially from the recovery passage 17 along the longitudinal direction of the supply cylinder 10. The connecting passage 17a extends forward from the lower end of the recovery passage 17 and connects to the connecting passage 18. It should be noted that the connecting passage 17a is formed, for example, in an arc shape. Two connecting passages 17a are provided radially separated by axis O1.

[0102] The connecting passage 17a is formed on the inner circumferential surface of the small-diameter portion 12b of the outer cylinder 12 and is configured as a circumferential groove extending in the circumferential direction. It should be noted that the connecting passage 17a may also be, for example, a circumferential groove formed on the inner circumferential surface of the inner cylinder 13. Furthermore, the connecting passage 17a may also be formed by combining the circumferential grooves formed on the outer cylinder 12 and the inner cylinder 13 respectively.

[0103] The connecting passage 17a communicates with the interior of container A through the connecting opening 18a, which will be described later. It should be noted that the connecting passage 17a, except for the connecting opening 18a, is configured to be closed downwards (inside container A).

[0104] like Figure 1 and Figure 2 As shown, a connecting cylinder 30 extending forward is provided at the upper end of the longitudinal supply cylinder 10.

[0105] The connecting cylinder portion 30 is formed as a bottomed cylinder that is open at the front and closed at the rear. The bottom 31 of the connecting cylinder portion 30 is integrally formed with the upper end of the outer cylinder 12. A through hole 31a is formed in the bottom 31, extending through the bottom 31 in the front-rear direction.

[0106] The through hole 31a opens toward the through hole 13f formed at the upper end of the inner cylinder 13. It should be noted that the through hole 13f is formed in the small-diameter portion 13b of the inner cylinder 13, located above the valve seat portion 13e. Thus, the connecting cylinder portion 30 communicates with the portion of the inner cylinder 13 located above the valve seat portion 13e via the through hole 31a and the through hole 13f.

[0107] It should be noted that the inner diameter of the connecting cylinder portion 30 is greater than or equal to the inner diameter of the inner cylinder 13. In addition, a sealing plug 32 is tightly fitted into the front end of the connecting cylinder portion 30.

[0108] The sealing plug 32 has a plug body 32a and a flange portion 32b.

[0109] The plug body 32a is formed as a bottomed cylindrical shape that is open to the front and closed at the rear, and fits tightly into the front end of the connecting cylinder 30. Thus, the plug 32 closes the front opening of the connecting cylinder 30.

[0110] The flange portion 32b extends outward from the front opening edge of the plug body 32a. With the plug body 32a installed on the connecting cylinder portion 30, the flange portion 32b abuts against the front opening edge of the connecting cylinder portion 30 from the front.

[0111] like Figure 1 As shown, a cylinder section 40 is provided below the connecting cylinder section 30.

[0112] The cylinder body cylindrical portion 40 protrudes forward from the small-diameter portion 12b of the outer cylinder 12 and opens forward. It should be noted that the rear portion of the lower end of the cylinder body cylindrical portion 40 is integrally formed with the annular connecting portion 12c of the outer cylinder 12.

[0113] For example, a lower side rib 46 is provided around the cylinder portion 40.

[0114] The lower rib 46 is formed to be positioned between the cylinder block cylindrical portion 40 and the large-diameter portion 12a. The lower rib 46 is, for example, positioned directly below the cylinder block cylindrical portion 40, avoiding its position. A pair of lower ribs 46 are spaced apart circumferentially around the axis of the cylinder block cylindrical portion 40. The upper end of each lower rib 46 connects to the outer peripheral surface of the cylinder block cylindrical portion 40, and the rear end of each lower rib 46 connects to the outer peripheral surface of the large-diameter portion 12a. It should be noted that the lower rib 46 may also be positioned directly below the cylinder block cylindrical portion 40.

[0115] A fitting cylinder portion 41 is provided on the inner side of the cylinder portion 40. The fitting cylinder portion 41 protrudes forward from the small diameter portion 12b of the outer cylinder 12 and opens forward.

[0116] The fitting sleeve portion 41 is coaxially mounted with the cylinder block sleeve portion 40. It should be noted that the front end of the fitting sleeve portion 41 is located further rearward than the front end of the cylinder block sleeve portion 40.

[0117] A connecting passage 18 extending in the vertical direction is formed between the inner circumferential surface of the outer cylinder 12 and the outer circumferential surface of the inner cylinder 13. The connecting passage 18 is separated from the recovery passage 17 around the axis O1 and is located further forward than the recovery passage 17 and the axis O1. Specifically, the connecting passage 18 is disposed at the front end of the longitudinal supply cylinder 10.

[0118] The upper end of the connecting passage 18 is located behind the fitting cylinder portion 41. The lower end of the connecting passage 18 communicates with the interior of the container body A through the communicating opening 18a formed in the annular connecting portion 13c of the inner cylinder 13.

[0119] Thus, the connecting passage 18 connects the interior of the fitting cylinder portion 41 to the interior of the container body A through the connecting opening 18a and the large diameter portion 13a. It should be noted that the connecting passage 18 functions as a residual pressure release passage for venting air from the main cylinder 53. Furthermore, the previously described recovery passage 17 connects to the interior of the container body A through the connecting passage 17a, the connecting passage 18, and the connecting opening 18a.

[0120] It should be noted that the connecting passage 18 can be formed, for example, by a longitudinal groove formed on the outer peripheral surface of the inner cylinder 13, or by combining longitudinal grooves formed on the outer cylinder 12 and the inner cylinder 13 respectively.

[0121] The injection barrel 11 extends in the front-rear direction and communicates with the interior of the longitudinal supply barrel 10 through the accumulator cylinder 90 and the connecting barrel 30. The injection barrel 11 extends forward from the front wall 92 in the accumulator cylinder 90, guiding the liquid that has passed through the longitudinal supply barrel 10 and the connecting barrel 30 to the injection port 4. The central axis of the injection barrel 11 is arranged parallel to the axis O2. It should be noted that, in the illustrated example, the central axis of the injection barrel 11 is located above the axis O2 of the accumulator cylinder 90.

[0122] The trigger mechanism 50 includes a trigger section 51, a main cylinder 53, a main piston 52, and a coil spring (force application component) 54. By swinging the trigger section 51 backward, the trigger mechanism 50 enables liquid to flow from the longitudinal supply cylinder 10 toward the injection hole 4.

[0123] The trigger section 51 is positioned in front of the longitudinal supply barrel 10 such that it can move backward when a forward force is applied. The trigger section 51 is formed to extend in the vertical direction and is positioned below the injection barrel 11.

[0124] The upper end of the trigger section 51 is axially supported on the nozzle member 3 in a manner that allows it to swing in the front-back direction. Specifically, the trigger section 51 includes: a main plate member 51a, which has a front surface that is concavely curved toward the rear when viewed from the side in the left-right direction; and a pair of side plate members 51b, which stand upright toward the rear from the left and right side edges of the main plate member 51a.

[0125] A pair of connecting plates 51c are formed at the upper ends of a pair of side plate members 51b. These connecting plates 51c extend upward to the sides of the nozzle member 3 and clamp the nozzle member 3 from the left and right directions. A pivot portion 55 is provided protruding from the outer side of the pair of connecting plates 51c in the left and right directions. These pivot portions 55 are rotatably supported by bearing portions 56 provided on the sides of the nozzle member 3.

[0126] Thus, the trigger section 51 is supported so that it can swing back and forth about the pivot section 55.

[0127] like Figure 1 and Figure 2 As shown, the main cylinder 53 is disposed behind the trigger section 51 and is disposed opposite to the trigger section 51 in the front-rear direction. The main cylinder 53 has: an outer cylinder section 53a that opens forward; a rear wall section 53b that closes the rear end opening of the outer cylinder section 53a; a cylindrical piston guide section 53c that protrudes forward from the central portion of the rear wall section 53b; and a cylindrical connecting cylinder section 53d that protrudes rearward from the portion of the rear wall section 53b located above the piston guide section 53c and opens in both the front-rear direction.

[0128] The outer cylinder portion 53a is coaxially disposed with the cylinder portion 40 and is fitted inside the cylinder portion 40. The inner circumferential surface of the cylinder portion 40 and the outer circumferential surface of the outer cylinder portion 53a are in close contact with each other at their two ends in the front-rear direction. An annular gap S2 is provided at the midpoint between the inner circumferential surface of the cylinder portion 40 and the outer circumferential surface of the outer cylinder portion 53a, between the two ends in the front-rear direction.

[0129] A first vent 53g is formed in the outer cylinder portion 53a, which communicates with the inner side of the outer cylinder portion 53a and the gap S2. For example... Figure 1 As shown, a second vent hole 12f is formed in the annular connecting portion 12c of the outer cylinder 12, which communicates with the gap S1. The gap S1 is the gap between the annular connecting portion 12c of the outer cylinder 12 and the annular connecting portion 13c of the inner cylinder 13. Furthermore, a third vent hole 13g is formed in the annular connecting portion 13c of the inner cylinder 13, which communicates with the inner side of the mounting cover 14 through the gap S1.

[0130] The connecting cylinder portion 53d is integrated with each through hole formed in the outer cylinder 12 and the inner cylinder 13. The inner cylinder 13 of the longitudinal supply cylinder portion 10 is connected to the main cylinder 53 through the connecting cylinder portion 53d. It should be noted that the rear end of the connecting cylinder portion 53d protrudes into the interior of the inner cylinder 13.

[0131] The through hole for fitting the connecting cylinder portion 53d is partially open in the small-diameter portion 13b of the inner cylinder 13, located between the valve seat portion 13e and the support cylinder portion 16. Therefore, the ball valve 19, which is seated at the upper opening edge of the support cylinder portion 16 in a manner that is away from the upper opening edge of the support cylinder portion 16, can switch the connection and disconnection between the container body A and the main cylinder body 53.

[0132] The ball valve 19 is configured to cut off the communication between the container A inside the longitudinal supply cylinder 10 and the main cylinder 53 when pressurization is applied in the main cylinder 53, and to move upward when depressurization is applied in the main cylinder 53, thereby allowing the communication between the container A inside the longitudinal supply cylinder 10 and the main cylinder 53 to pass through.

[0133] Since an accumulator valve 20 is disposed above the ball valve 19, excessive upward displacement of the ball valve 19 is limited by the accumulator valve 20. It should be noted that excessive upward displacement of the ball valve 19 can also be limited by the rear end of the communicating cylinder portion 53d.

[0134] The piston guide portion 53c is formed as a bottomed cylindrical shape that is open at the front and closed at the rear, and is disposed inside the outer cylindrical portion 53a. The front end of the piston guide portion 53c is located further rearward than the front end of the outer cylindrical portion 53a. The bottom of the piston guide portion 53c is formed as an annular shape, and a fitting cylindrical portion 41 is fitted inside it. It should be noted that the front end of the fitting cylindrical portion 41 protrudes into the interior of the piston guide portion 53c.

[0135] The piston guide portion 53c is coaxially disposed with the fitting cylinder portion 41. An annular recess 53e is formed on the outer peripheral surface of the rear end of the piston guide portion 53c.

[0136] The main piston 52 is disposed inside the main cylinder 53 in a manner that allows it to move in the back-and-forth direction, and is also capable of moving in the back-and-forth direction in conjunction with the swinging of the trigger 51. The interior of the main cylinder 53 is pressurized and depressurized as the main piston 52 moves in the back-and-forth direction.

[0137] The main piston 52 is formed as a topped cylinder that is open at the rear and closed at the front, and is coaxially mounted with the main cylinder 53. It should be noted that the main piston 52 is locked in the middle part of the trigger section 51 in the vertical direction.

[0138] The main piston 52 and the trigger 51 are forced forward by the force of the coil spring 54. As the trigger 51 swings backward, the main piston 52 moves backward and is pressed into the main cylinder 53.

[0139] The main piston 52 has: a piston body portion 52a, which has a rear opening and a piston guide portion 53c inserted inside; and a sliding cylinder portion 52b, which protrudes from the rear end of the piston body portion 52a toward its radially outward side and slides in contact with the inner circumferential surface of the outer cylinder portion 53a.

[0140] The piston body 52a is formed as a topped cylindrical shape that is open at the rear and closed at the front. The inner diameter of the piston body 52a is slightly larger than the outer diameter of the piston guide 53c. The front end of the piston body 52a abuts against the trigger 51 from the rear, thereby locking itself against the trigger 51.

[0141] An annular inner lip 52c is formed at the rear end of the piston body 52a. The inner lip 52c protrudes radially inward and slides in contact with the outer peripheral surface of the piston guide 53c. This ensures a seal between the inner lip 52c and the outer peripheral surface of the piston guide 53c.

[0142] It should be noted that if the main piston 52 moves rearward so that the inner lip 52c reaches the recess 53e of the piston guide 53c, a number of gaps are formed between the inner lip 52c and the recess 53e. Through these gaps, the gap between the inner surface of the outer cylinder portion 53a of the main cylinder 53 and the inner circumferential surface of the piston body portion 52a and the outer circumferential surface of the piston guide 53c is connected. Thus, the inner cylinder portion 53a is connected to the inner fitting cylinder portion 41 through the inner piston guide portion 53c.

[0143] It should be noted that the inner lip 52c reaches the recess 53e when the main piston 52 is in the rearmost position.

[0144] The sliding cylinder portion 52b expands in diameter from its central portion in the front-rear direction towards the front and rear, respectively. The sliding cylinder portion 52b has outer lips 52d located at both ends in the front-rear direction. The outer lips 52d slide in close contact with the inner circumferential surface of the outer cylinder portion 53a. This ensures a tight seal between the outer lips 52d and the inner circumferential surface of the outer cylinder portion 53a.

[0145] When the trigger section 51 is in its forward swing position, the main piston 52 is correspondingly in its forward position. At this time, the sliding cylinder section 52b closes the first vent 53g formed in the outer cylinder section 53a. Then, when the main piston 52 moves backward a predetermined amount from its forward position due to the rearward swing of the trigger section 51, the sliding cylinder section 52b opens the first vent 53g. As a result, the first vent 53g opens to the outside of the trigger-type liquid injector 1 through the inside of the outer cylinder section 53a.

[0146] Thus, the interior of container body A can communicate with the exterior of trigger-type liquid injector 1 through the third vent 13g, gap S1, second vent 12f, gap S2 and first vent 53g formed in the annular connecting portion 13c of inner cylinder 13.

[0147] The coil spring (force-applying component) 54 is made of metal and is coaxially mounted with the main piston 52 and the main cylinder 53, and applies force to the trigger part 51 forward via the main piston 52.

[0148] A coil spring 54 is disposed across the interior of the piston guide portion 53c and the interior of the piston body portion 52a. The rear end of the coil spring 54 is supported on the bottom (rear wall portion 53b) of the piston guide portion 53c in a manner that surrounds the front end of the fitting sleeve portion 41. The front end of the coil spring 54 is supported on a rearward-facing stepped surface formed within the piston body portion 52a.

[0149] It should be noted that the material of the helical spring 54 is not limited to metal; it can also be made of materials such as resin springs.

[0150] A stop T is provided in a way that allows for removability of the gap in the front-rear direction between the trigger section 51 and the main cylinder 53.

[0151] The stop T is a limiting component that restricts the rearward swing of the trigger section 51 by abutting against the trigger section 51 and the main cylinder 53 respectively. It should be noted that the user can discard the removed stop T, or reinstall the stop T after the use of the trigger-type liquid injector 1 to restrict the rearward swing of the trigger section 51.

[0152] like Figure 1 and Figure 2 As shown, the accumulator cylinder 90 is positioned above the longitudinal supply cylinder 10 and the connecting cylinder 30. By swinging the trigger 51 rearward, liquid that has passed through the longitudinal supply cylinder 10 and the connecting cylinder 30 is supplied into the accumulator cylinder 90. The accumulator cylinder 90 extends in the longitudinal direction, spanning the longitudinal supply cylinder 10. In the illustrated example, the accumulator cylinder 90 is arranged substantially parallel to the connecting cylinder 30 and the cylinder section 40. It should be noted that the lower end of the accumulator cylinder 90 is integrally formed with the upper end of the longitudinal supply cylinder 10 and the upper end of the connecting cylinder 30.

[0153] The accumulator cylinder 90 has a front wall portion 92 located at the front end and a cylinder 93 extending rearward from the front wall portion 92. The accumulator cylinder 90 is integrally formed as a topped cylinder that is open at the rear and closed at the front.

[0154] The front wall portion 92 protrudes upward from the middle portion in the front-rear direction of the connecting cylinder portion 30. A connecting hole 95 is formed in the front wall portion 92, extending through the front wall portion 92 in the front-rear direction. The connecting hole 95 is circular in shape and is coaxially arranged with the axis O2. Thus, the accumulating space 90a within the accumulating cylinder 90 (described later) and the interior of the ejector cylinder portion 11, which communicates with the injection port 4, are connected through the connecting hole 95. It should be noted that the connecting hole 95 may also be formed in the cylinder 93.

[0155] The cylinder 93 has: a front cylinder portion 96 that extends rearward from the front wall portion 92; a rear cylinder portion 97 that has an outer diameter and an inner diameter that are larger than the outer diameter and an inner diameter of the front cylinder portion 96 and is located further rearward than the front cylinder portion 96; and a stepped portion 98 that connects the front cylinder portion 96 and the rear cylinder portion 97 in the front-rear direction.

[0156] The stepped portion 98 increases in diameter from front to rear. The top wall portion 12d of the outer cylinder 12 is connected to the connecting portion between the front cylinder portion 96 and the stepped portion 98. More specifically, the top wall portion 12d of the outer cylinder 12 is connected to the portion of the connecting portion between the front cylinder portion 96 and the stepped portion 98 located on the lower side of the cylinder 93.

[0157] The rear cylinder portion 97 is located further rearward than the longitudinal supply cylinder portion 10. Therefore, the rear cylinder portion 97 functions as a rear cylinder portion of the accumulator cylinder 90 that protrudes further rearward than the longitudinal supply cylinder portion 10. It should be noted that the rear cylinder portion 97 is integrally formed with the upper end portion of the longitudinal supply cylinder portion 10.

[0158] In addition, a supply hole 91, a connecting groove 94, and a recovery hole 99 are formed in the storage cylinder 90.

[0159] A supply hole 91 is formed on the lower part of the front end of the front cylinder 96, and is also formed in the connecting cylinder 30 at a position further rearward than the stopper body 32a. Thus, liquid passing through the longitudinal supply cylinder 10 and the connecting cylinder 30 is supplied to the accumulator cylinder 90 through the supply hole 91.

[0160] A connecting groove 94 is formed on the inner circumferential surface of the rear portion of the front cylinder 96. A plurality of connecting grooves 94 are arranged at intervals around the axis O2.

[0161] The recovery hole 99 extends integrally through the connection between the front cylinder portion 96 and the stepped portion 98, as well as the top wall portion 12d of the outer cylinder 12, in the vertical direction. The recovery hole 99 opens toward the upper end of the recovery passage 17 provided in the longitudinal supply cylinder portion 10. Thus, the recovery hole 99 communicates with the interior of the container body A through the recovery passage 17. It should be noted that the rear end of the lower connecting groove 94 of the plurality of connecting grooves 94 is formed at the front end of the recovery hole 99.

[0162] The support member 60 is fixed to the rear end of the accumulator cylinder 90 and is coaxially arranged with the axis O2. The support member 60 has a support wall portion 62 located at the rear end and a fixed cylindrical portion 61 extending forward from the support wall portion 62. The support member 60 is integrally formed as a bottomed cylindrical shape that is open at the front and closed at the rear.

[0163] The fixed cylinder 61 is fitted into the rear end of the accumulator cylinder 90 while its rearward movement and rotational movement about axis O2 are restricted. The support wall 62 is formed in an annular shape. The outer part of the support wall 62 communicates with the part located further rearward than the accumulator plunger 80 within the accumulator cylinder 90.

[0164] A locking protrusion 63 protruding forward is formed on the support wall portion 62. A plurality of locking protrusions 63 are spaced apart around the axis O2 and are locked from the front into the locking recess 97a formed in the rear cylinder portion 97. As a result, the fixed cylinder portion 61 is prevented from falling rearward from the accumulator cylinder 90.

[0165] The accumulator plunger 80 is disposed within the accumulator cylinder 90 in a manner that allows it to move in the forward-backward direction along the axis O2. The accumulator plunger 80 moves rearward as liquid is supplied into the accumulator cylinder 90. When the communication between the longitudinal supply cylinder 10, which passes through the communication hole 95, and the injection hole 4 is severed, and the accumulator plunger 80 moves rearward, it connects the longitudinal supply cylinder 10 and the injection hole 4 through the communication hole 95.

[0166] The accumulator plunger 80 has a sliding member 24 that slides in the front-rear direction within the accumulator cylinder 90, and a bearing member 33 fitted within the sliding member 24. The sliding member 24 and the bearing member 33 are formed into a cylindrical shape extending in the front-rear direction and are coaxially arranged with the axis O2.

[0167] The sliding component 24 is formed of a softer material than the bearing component 33 and the accumulator cylinder 90, and has a plunger cylinder 25 extending in the front-rear direction and a closed wall 26 that closes the front opening of the plunger cylinder 25.

[0168] A front lip 25a and a rear lip 25b are provided protrudingly throughout the entire circumference of the outer periphery of the plunger cylinder 25.

[0169] The front lip 25a slides tightly along the front-rear direction on the inner circumferential surface of the front cylinder portion 96 of the cylinder 93. This ensures a tight seal between the front lip 25a and the inner circumferential surface of the front cylinder portion 96.

[0170] Specifically, the front lip 25a is formed as a cylinder protruding forward from the outer peripheral surface of the plunger cylinder 25. A gap is provided between the inner peripheral surface of the front lip 25a and the outer peripheral surface of the front end portion of the plunger cylinder 25. Furthermore, the diameter of the front end portion of the plunger cylinder 25 located further forward than the front lip 25a is smaller than the diameter of the portion located further rearward than the front end portion. A gap is provided between the outer peripheral surface of the front end portion of the plunger cylinder 25 and the inner peripheral surface of the accumulator cylinder 90.

[0171] Furthermore, the supply hole 91 formed on the inner side of the front lip 25a and the accumulator cylinder 90 is opened in this gap. Therefore, this gap functions as an accumulator space 90a, which stores the liquid that passes through the longitudinal supply cylinder 10, and the accumulator space 90a expands by moving the accumulator plunger 80 rearward through the supply of liquid.

[0172] The rear lip 25b slides tightly along the front-to-back direction on the inner circumferential surface of the rear cylinder portion 97 in the cylinder 93. This ensures a tight seal between the rear lip 25b and the inner circumferential surface of the rear cylinder portion 97. The rear lip 25b is formed as a cylinder protruding forward from the outer peripheral edge of the rear end of the plunger cylinder 25. A gap is provided between the inner circumferential surface of the rear lip 25b and the outer circumferential surface of the rear end of the plunger cylinder 25.

[0173] The sealing wall 26 is pressed against the portion of the rear surface of the front wall portion 92 of the accumulator 90 located at the periphery of the opening of the connecting hole 95. A protrusion 26a protruding forward is formed on the front surface of the sealing wall 26.

[0174] The protrusion 26a is formed into a frustum-shaped cone coaxially with the axis O2. The outer diameter of the protrusion 26a decreases from rear to front. Thus, by abutting the outer peripheral surface of the protrusion 26a against the rear end of the connecting hole 95, the connecting hole 95 is sealed.

[0175] The supporting component 33 has a supporting cylinder 34 and a supporting seat 35.

[0176] The receiving cylinder 34 is formed as a topped cylinder that is open at the rear and closed at the front, and is disposed inside the plunger cylinder 25. The rear portion of the receiving cylinder 34 protrudes further rearward than the rear end opening of the plunger cylinder 25 and enters the rear cylinder portion 97 of the cylinder 93. The outer diameter of the receiving cylinder 34 is smaller than the inner diameter of the rear cylinder portion 97. As a result, an annular gap is provided between the outer circumferential surface of the rear portion of the receiving cylinder 34 and the inner circumferential surface of the rear cylinder portion 97. Furthermore, the front portion of the force-applying member 81 is inserted into this gap.

[0177] The bearing seat 35 is formed as a flange protruding from the outer peripheral surface of the rear portion of the bearing cylinder 34. The front surface of the bearing seat 35 abuts against or approaches the rear opening edge of the plunger cylinder 25.

[0178] The force-applying component 81 applies force to the accumulating plunger 80 in a forward-facing direction. While surrounding the rear portion of the receiving cylinder 34, the force-applying component 81 is positioned between the receiving seat portion 35 and the support wall portion 62 in the support component 60 in a compressed state in the front-rear direction. Thus, the front edge of the force-applying component 81 abuts against the rear surface of the receiving seat portion 35, and the rear edge abuts against the front surface of the support wall portion 62.

[0179] It should be noted that the force-applying component 81 is a metal helical spring arranged coaxially with the axis O2. However, it is not limited to this case; for example, a resin spring can be used as the force-applying component 81, or other elastic components can be used.

[0180] When the accumulator plunger 80 moves rearward against the force-applying member 81, causing the sealing wall 26 to move rearward from the front wall portion 92 of the accumulator cylinder 90, the connecting hole 95 is opened. Therefore, the liquid is continuously pressurized in the accumulator space 90a of the accumulator cylinder 90 until the accumulator plunger 80 moves rearward. Then, if the hydraulic pressure in the accumulator space 90a reaches a predetermined value, the accumulator plunger 80 moves rearward against the force-applying member 81. This allows the liquid in the accumulator space 90a to be supplied to the injection hole 4 side through the connecting hole 95. Therefore, the accumulator plunger 80 functions as an accumulator valve.

[0181] The accumulator valve 20 is installed inside the inner cylinder 13 of the longitudinal supply cylinder section 10.

[0182] The accumulator valve 20 is configured as a check valve that allows liquid to be supplied from the longitudinal supply cylinder 10 into the accumulator body 90 and restricts liquid from flowing out of the accumulator body 90 into the longitudinal supply cylinder 10. Specifically, the accumulator valve 20 has: a fixing part 21, which is fixed to the upper end of the inner cylinder 13; a valve body part 22, which is disposed on the upper surface of the valve seat part 13e; and an elastic deformation part 23, which connects the fixing part 21 and the valve body part 22.

[0183] The fixing part 21 is formed in the shape of a circular plate and is tightly fitted into the upper end of the inner cylinder 13.

[0184] The valve body 22 is formed as a column extending in the vertical direction and is opposed to the rear end opening of the connecting cylinder 53d in the front-rear direction. The lower end face of the valve body 22 is opposed to the ball valve 19 in the vertical direction.

[0185] On the outer peripheral surface of the valve body 22, a flange-shaped valve plate 22a is formed in a portion located above the connecting cylinder 53d. This valve plate 22a is disposed on the upper surface of the valve seat 13e in a manner that allows it to move upwards away from the valve. The elastic deformation portion 23 is formed to be elastically deformable in the vertical direction. When pressurized within the main cylinder 53, the valve body 22 is displaced upwards, causing the elastic deformation portion 23 to compress and deform upwards. As a result, the valve plate 22a moves upwards away from the valve seat 13e, allowing liquid to be supplied from the longitudinal supply cylinder 10 into the accumulator 90.

[0186] The cover 100 is formed to cover the entire longitudinal supply cylinder 10, the entire injection cylinder 11, and the entire accumulation cylinder 90, except for the lower end, from at least the left and right sides and the top.

[0187] like Figure 1 and Figure 2 As shown, a first connecting plate 110 is formed above the injection tube portion 11.

[0188] The first connecting plate 110 is formed as a plate extending forward from the upper end of the front wall portion 92 of the accumulator cylinder 90. Thus, the first connecting plate 110 is formed as a top-view rectangular shape extending in the front-rear direction and the left-right direction.

[0189] A locking hole 111 is formed in the first connecting plate 110, extending through the first connecting plate 110 in the vertical direction. It should be noted that the shape of the locking hole 111 is not particularly limited, and it can be formed, for example, as a rectangular shape when viewed from above.

[0190] In addition, a bulge 112 is formed on the upper surface of the first connecting plate 110. The bulge 112 protrudes upward and contacts the cover 100 from below.

[0191] The bulge 112 is formed, for example, to bulge upward in a hemispherical shape when viewed in longitudinal section, and is formed to be transversely long in a manner that extends along the entire length of the first connecting plate 110 in the front-back direction. In addition, a pair of bulges 112 are arranged in a manner that are parallel in the left-right direction with the locking hole 111 between them.

[0192] However, the shape and / or location of the bulge 112 are not limited to this case and can be changed as appropriate.

[0193] The first connecting plate 110 contacts the cover 100 from below via the bulge 112, and its upward displacement is suppressed.

[0194] (Nozzle component)

[0195] like Figure 1 and Figure 2 As shown, the nozzle component 3 is assembled onto the injector body 2 using the injection tube portion 11.

[0196] The nozzle component 3 includes: a mounting cylinder portion 120 that is externally fitted into the injection cylinder portion 11 from the front; a limiting wall 121 that extends downward from the mounting cylinder portion 120; a connecting wall 122 that extends upward from the mounting cylinder portion 120; a nozzle shaft portion 123 located inside the front end of the mounting cylinder portion 120; and a second connecting plate 124 that extends rearward from the connecting wall 122.

[0197] The mounting cylinder 120 has a front cylinder 120a that extends further forward than the limiting wall 121 and the connecting wall 122, and a rear cylinder 120b that extends further rearward than the limiting wall 121 and the connecting wall 122. The rear cylinder 120b of the mounting cylinder 120 is tightly fitted externally into the injection cylinder 11 from the front side.

[0198] The rear cylindrical portion 120b of the mounting cylindrical portion 120 is not externally fitted to the injection cylindrical portion 11 along its entire length, but rather externally fitted to the portion of the injection cylindrical portion 11 excluding the base end, i.e., the rear end (root side). Thus, the rear end edge of the rear cylindrical portion 120b is positioned on the front side of the front wall portion 92 with a gap in the front-rear direction between it and the front wall portion 92.

[0199] The nozzle shaft portion 123 is coaxially disposed with the injection barrel portion 11 inside the front barrel portion 120a of the mounting barrel portion 120. It should be noted that the central axis of the nozzle shaft portion 123 is located slightly above the axis O2 of the accumulator cylinder 90. The front end of the nozzle shaft portion 123 is located slightly rearward than the front end of the front barrel portion 120a in the mounting barrel portion 120.

[0200] A nozzle cover 125 is mounted on the nozzle shaft portion 123. The nozzle cover 125 has a spray hole 4 that opens at the front and sprays liquid forward. It should be noted that the spray hole 4 is coaxially disposed with the injection barrel portion 11. It should be noted that a communication path (not shown) is provided between the outer surface of the nozzle shaft portion 123 and the inner surface of the nozzle cover 125, which communicates with the spray hole 4 to the portion of the interior of the front barrel portion 120a of the mounting barrel portion 120 located further rearward than the nozzle shaft portion 123.

[0201] By having the lower edge of the limiting wall 121 abut against the upper end of the trigger portion 51 from above, the limiting wall 121 positions the trigger portion 51 in the forward swing position, thereby limiting the trigger portion 51 from swinging further forward.

[0202] The second connecting plate 124 is formed as a plate extending rearward from the upper end of the connecting wall 122. Thus, the second connecting plate 124 is formed as a rectangular shape extending in both the front-rear and left-right directions, and is arranged parallel to the first connecting plate 110. The second connecting plate 124 is formed between the mounting cylinder 120 and the first connecting plate 110, and is configured to overlap the first connecting plate 110 from below.

[0203] A locking protrusion 126 is formed on the second connecting plate 124. The locking protrusion 126 protrudes upward and enters into the locking hole 111 formed in the first connecting plate 110, locking with the locking hole 111 from the rear. Thus, the entire nozzle component 3 is assembled to prevent disengagement such as relative forward movement with respect to the injection barrel portion 11.

[0204] Furthermore, the second connecting plate 124 extends rearward beyond the mounting cylinder 120, surrounding the rear end portion of the injection cylinder 11. In addition, the second connecting plate 124 is sandwiched between the first connecting plate 110 and the injection cylinder 11 in a vertical direction. Specifically, a protrusion 127 is formed on the outer peripheral surface of the injection cylinder 11 at a position further rearward than the mounting cylinder 120. This protrusion 127 protrudes upward and clamps the rear end portion of the second connecting plate 124 from below between the protrusion 127 and the first connecting plate 110. In the illustrated example, the protrusion 127 is formed as a rib extending in a front-rear direction.

[0205] In the trigger-type liquid injector 1, such as Figure 1 and Figure 2 As shown, a displacement suppression part 150 is provided between the rear cylinder portion (rear cylinder portion) 97 and the longitudinal supply cylinder portion 10 in the accumulator cylinder 90 to suppress displacement of the rear cylinder portion 97 relative to the longitudinal supply cylinder portion 10. The displacement suppression part 150 has a reinforcing rib 151, which is integrally formed on the longitudinal supply cylinder portion 10 and the rear cylinder portion 97 in such a way that the longitudinal supply cylinder portion 10 and the rear cylinder portion 97 are connected as one unit.

[0206] The reinforcing rib 151 is formed to integrally connect the small-diameter portion 12b of the outer cylinder 12 constituting the longitudinal supply cylinder portion 10 with the rear cylinder portion 97. Specifically, the reinforcing rib 151 is formed in the rear portion of the outer peripheral surface of the small-diameter portion 12b, and is formed as a longitudinal rib extending along the entire length of the small-diameter portion 12b in the vertical direction. The lower end of the reinforcing rib 151 reaches the annular connecting portion 12c of the outer cylinder 12 and is integrally formed with respect to the annular connecting portion 12c. The upper end of the reinforcing rib 151 reaches the rear cylinder portion 97 and is integrally formed with respect to the rear cylinder portion 97.

[0207] Thus, the longitudinal supply cylinder 10 and the rear cylinder 97 are securely connected as one unit via the reinforcing rib 151. In particular, the reinforcing rib 151 is arranged such that it is sandwiched between the annular connecting portion 12c and the rear cylinder 97 in the vertical direction, thereby effectively suppressing the displacement of the rear cylinder 97 relative to the longitudinal supply cylinder 10 in the vertical direction.

[0208] (The function of a trigger-type liquid injector)

[0209] Next, the case of using the trigger-type liquid injector 1 will be explained. It should be noted that by repeatedly operating the trigger section 51, liquid is filled into each part of the trigger-type liquid injector 1A, so that liquid can be drawn into the longitudinal supply cylinder 10.

[0210] Remove Figure 1After the stop T is shown, if the trigger 51 is pulled backward against the force of the coil spring 54, the main piston 52 moves backward from its foremost position, and the main cylinder 53 is pressurized. As a result, the liquid in the main cylinder 53 is supplied to the inner cylinder 13 of the longitudinal supply cylinder 10 through the connecting cylinder 53d. The liquid supplied to the inner cylinder 13 then presses downward against the ball valve 19 located at the upper opening edge of the support cylinder 16, and lifts the valve body 22 of the accumulator valve 20, causing the valve plate 22a to move away from the upper surface of the valve seat 13e.

[0211] Therefore, the liquid in the longitudinally supplied cylinder 10 can be passed through Figure 2 The through hole 13f, through hole 31a, connecting cylinder 30, and supply hole 91 shown are supplied to the storage space 90a of the storage cylinder 90, and the storage space 90a can be pressurized. Therefore, as the storage space 90a is pressurized, the storage plunger 80 can move backward from its maximum forward position against the force applied by the force-applying member 81, and liquid can be stored (filled) in the storage space 90a.

[0212] It should be noted that in the initial stage when liquid begins to be introduced into the accumulation space 90a, the liquid enters the gap between the inner circumferential surface of the front lip 25a and the outer circumferential surface of the front end of the plunger cylinder 25. Therefore, it is easy for the accumulation plunger 80 to move rearward.

[0213] By moving the accumulator plunger 80 rearward, the sealing wall 26 is separated rearward from the front wall portion 92 of the accumulator cylinder 90. This allows the connecting hole 95 to open, and the liquid in the pressurized accumulator space 90a can be guided through the connecting hole 95 and the ejector cylinder portion 11 to the injection hole 4. Therefore, the liquid can be ejected forward from the injection hole 4.

[0214] As described above, whenever the trigger 51 is pulled backward, liquid can be ejected from the injection hole 4, and the accumulator plunger 80 can be moved backward to store the liquid in the accumulator space 90a.

[0215] Subsequently, if the trigger 51 is released, the main piston 52 moves forward within the main cylinder 53 by the elastic restoring force (acting force) of the coil spring 54, and thus the trigger 51 also moves forward to reset. Therefore, the pressure inside the main cylinder 53 can be reduced to a pressure lower than that inside the container A, allowing the ball valve 19 to move upward away from the upper opening edge of the support cylinder 16 while the valve body 22 of the accumulator valve 20 is pressed against the upper surface of the valve seat 13e. Therefore, liquid from the container A can be drawn into the longitudinal supply cylinder 10 and introduced into the main cylinder 53 through the support cylinder 16 and the connecting cylinder 53d.

[0216] This allows preparation for the next spray.

[0217] It should be noted that if the operation of the trigger 51 is stopped, although the supply of liquid to the storage space 90a in the longitudinal supply cylinder 10 and the connecting cylinder 30 is stopped, the storage plunger 80 begins to move forward toward the forwardmost position by the force of the force-applying member 81.

[0218] It should be noted that at this time, the outflow of liquid from the storage space 90a into the longitudinal supply cylinder 10 is restricted by the storage valve 20.

[0219] Therefore, the liquid accumulated in the storage space 90a can be guided to the injection hole 4 through the connecting hole 95 and the injection tube 11, and the liquid can be ejected forward through the injection hole 4.

[0220] Thus, not only when the trigger 51 is pulled backward, but also when the trigger 51 is not operated, liquid can be sprayed out, and the liquid can be sprayed out continuously.

[0221] It should be noted that when the accumulator plunger 80 is in the final retracted position, if the trigger 51 is pulled backward, it is assumed that excessive liquid will be supplied into the accumulator space 90a, resulting in leakage, damage to various parts, etc.

[0222] However, in this embodiment, if the accumulating plunger 80 moves rearward to a certain extent, the front lip 25a reaches the communicating groove 94, thereby connecting the accumulating space 90a with the container body A through the communicating groove 94, the recovery hole 99, and the recovery passage 17. That is, when the accumulating plunger 80 moves rearward, the accumulating space 90a can be connected with the container body A through the recovery passage 17.

[0223] Therefore, a portion of the liquid in the storage space 90a can be returned to the container A, and excessive supply of liquid to the storage space 90a can be suppressed. This prevents excessive pressure build-up in the storage space 90a and inhibits leakage and damage to parts.

[0224] As explained above, the trigger-type liquid injector 1 according to this embodiment can spray liquid not only when the trigger 51 is pulled backward, but also when the trigger 51 is not operated, and can spray liquid continuously.

[0225] It should be noted that the upper end (fulcrum) of the trigger section 51 is pivotally supported on the nozzle component 3, and the main piston 52 is engaged in the middle part (point of action) of the trigger section 51. Therefore, by operating, for example, the lower end (point of force) of the trigger section 51, the main piston 52 can be moved efficiently using the so-called lever principle. Thus, the operability of the trigger section 51 can be improved.

[0226] Furthermore, in the trigger-type liquid injector 1 of this embodiment, a displacement suppression part 150 is provided between the rear cylinder 97 and the longitudinal supply cylinder 10 in the accumulator 90 to suppress the displacement of the rear cylinder 97 relative to the longitudinal supply cylinder 10. Therefore, even if an external force such as an impact caused by falling or an impact caused by contact with the outside is applied to the accumulator 90, the displacement (deformation) of the rear cylinder 97 in the vertical direction can be suppressed.

[0227] like Figure 1 As shown by arrow F1, even when an external force, such as a falling impact, acts on the rear end of the rear cylinder 97, the displacement suppression part 150 can suppress the rear cylinder 97 from bending downwards based on the connection between the rear cylinder 97 and the longitudinal supply cylinder 10 due to rotational torque caused by the external force. This improves rigidity against unexpected external forces and enhances the impact resistance of the trigger-type liquid injector 1.

[0228] Specifically, by means of longitudinal rib-shaped reinforcing ribs 151 integrally formed on the longitudinal supply cylinder 10 and the rear cylinder 97, the longitudinal supply cylinder 10 and the rear cylinder 97 are connected as one unit, thus effectively improving the rigidity of the connection portion between the longitudinal supply cylinder 10 and the rear cylinder 97. Therefore, as Figure 1 As shown by arrow F2, even when an external force is applied to the nozzle component 3 due to a falling impact, the displacement of the rear cylinder 97, which is lifted upwards from the connection between the rear cylinder 97 and the longitudinal supply cylinder 10 due to the rotational torque caused by the external force, can be effectively suppressed.

[0229] As a result, a high-quality trigger-type liquid ejector 1 with strong rigidity can be designed to withstand falling impacts, contact impacts, etc.

[0230] Furthermore, since it can improve impact resistance, for example, by making the rear cylinder 97 longer and positioned further rearward than the longitudinal supply cylinder 10, the internal volume (capacity) within the accumulator cylinder 90 can be further ensured. As a result, liquid can be further accumulated within the accumulator cylinder 90, and it can be configured as a trigger-type liquid injector 1 suitable for continuous injection.

[0231] Furthermore, in the trigger-type liquid injector 1 of this embodiment, the nozzle component 3 is assembled to the injector body 2 by inserting the mounting cylinder portion 120 externally into the injection cylinder portion 11. Moreover, by inserting the mounting cylinder portion 120 externally into the injection cylinder portion 11, the second connecting plate 124 overlaps with the first connecting plate 110 from below when the locking protrusion 126 is engaged with the locking hole 111 from the rear, and the second connecting plate 124 is sandwiched between the first connecting plate 110 and the injection cylinder portion 11 in the vertical direction.

[0232] Therefore, it is possible to suppress detachment (nozzle detachment) such as the nozzle component 3 moving forward relative to the injection barrel 11, while also suppressing movement such as the nozzle component 3 shifting vertically relative to the injector body 2.

[0233] (Second Implementation)

[0234] Next, see below, for reference Figures 6-13 A second embodiment of the trigger-type liquid injector of the present invention will be described. It should be noted that in this description of the embodiment, structures identical to those in the first embodiment described above are labeled with the same reference numerals and their descriptions are omitted; only the differences are described.

[0235] like Figure 6 and Figure 7 As shown, the trigger-type liquid injector 1A of this embodiment, like the trigger-type liquid injector 1 of the first embodiment, includes: an injector body 2, which is mounted on a container body A containing liquid; and a nozzle component 3, which has a spray hole 4 for spraying liquid and is mounted on the injector body 2.

[0236] like Figure 8 As shown, in this embodiment, the annular connecting portion 13c is formed with a step in the vertical direction such that the portion located further rearward than the small diameter portion 13b is positioned lower than the portion located further forward than the small diameter portion 13b. However, it is not limited to this case; the annular connecting portion 13c may also be formed to maintain the same height throughout the entire circumference.

[0237] An annular tube fitting sleeve 13h is formed in the small-diameter portion 13b, protruding further downward than the annular connecting portion 13c. The tube fitting sleeve 13h opens downward and is formed as a longitudinally sectional cone that gradually widens its inner circumference as it faces downward. The tube 15 is inserted into the inside of the small-diameter portion 13b from below through the tube fitting sleeve 13h and thus fitted.

[0238] Furthermore, in the trigger-type liquid injector 1A of this embodiment, such as Figure 7 , Figures 9-11 As shown, an upper rib 160 is integrally formed on the outer peripheral surface of the upper end of the accumulator cylinder 90.

[0239] The upper rib 160 is formed to protrude upward and is disposed on the axis O1 of the longitudinal supply cylinder 10, and extends in the front-rear direction. Specifically, the upper rib 160 is formed to be disposed on the upper part of the cylinder 93 and is located at the connection between the front cylinder 96 and the stepped part 98 in the cylinder 93.

[0240] The upper rib 160 includes: a front wall surface (first wall surface) 161 facing forward (the other side of the axial direction); a rear wall surface (second wall surface) 162 facing rearward (one side of the axial direction); a pair of side wall surfaces 163 facing outward in the left and right direction and connected to the front wall surface 161 and the rear wall surface 162; and a flat top wall surface 164 disposed above the front cylinder portion 96 and connected to the front wall surface 161, the rear wall surface 162 and the pair of side wall surfaces 163.

[0241] The upper rib 160 is formed such that its length along the front-to-back direction is longer than its width along the left-to-right direction. It should be noted that in the illustrated example, the upper rib 160 is not formed with a constant width along the front-to-back direction, but rather widens midway. Therefore, the upper rib 160 has a pair of bulges 165 that bulge outwards in the left-to-right direction.

[0242] A pair of bulges 165 are formed closer to the front wall surface 161 than the middle portion of the upper rib 160 in the front-rear direction. Thus, the upper rib 160 is configured such that the portion with the greatest lateral width is located directly above the axis O1 of the longitudinal supply cylinder 10 via the pair of bulges 165.

[0243] It should be noted that the sidewall surface 163 is formed to bulge outward in the left and right directions in accordance with the bulge of the bulge portion 165.

[0244] The front wall surface 161, the rear wall surface 162, and a pair of side wall surfaces 163 are all configured as sloping surfaces that extend outwards from the top wall surface 164 downwards. This will be explained in detail below. It should be noted that the rear wall surface 162 is configured to cover the stepped portion 98 from above and to connect with the portion of the boundary between the stepped portion 98 and the rear cylinder portion 97.

[0245] The front wall surface 161 is configured as an inclined surface that extends rearward from the outer peripheral surface of the accumulator cylinder 90, i.e., the outer peripheral surface of the front cylinder portion 96, upward. Specifically, the front wall surface 161 is formed such that, when viewed from the side of the accumulator cylinder 90, the angle θ1 of the front wall surface 161 relative to the outer peripheral surface of the front cylinder portion 96 is an acute angle of less than 90 degrees, i.e., 65 degrees.

[0246] Furthermore, a first curved surface 166 is formed at the connection between the front wall surface 161 and the outer peripheral surface of the front cylinder portion 96. This first curved surface 166 is recessed rearward when the accumulator cylinder 90 is viewed from the side. In the illustrated example, the first curved surface 166 is formed as a concave curved surface with a radius of curvature of 2 mm when the accumulator cylinder 90 is viewed from the side.

[0247] It should be noted that the connection between the front wall surface 161 and the top wall surface 164, when viewed from the side of the accumulator cylinder 90, becomes a curved surface with a radius of curvature of 0.5 mm. It should also be noted that the radius of curvature of this curved surface is not limited to 0.5 mm and can be appropriately varied.

[0248] like Figure 9 As shown, the rear wall surface 162 is configured as an inclined surface that, when viewed from the side, extends forward from the outer peripheral surface of the accumulator cylinder 90, i.e., the outer peripheral surface of the rear cylinder portion 97, upward. Specifically, the rear wall surface 162 is formed such that, when viewed from the side, the inclination angle θ2 of the rear wall surface 162 relative to the outer peripheral surface of the rear cylinder portion 97 is an acute angle of less than 90 degrees, i.e., 45 degrees.

[0249] Furthermore, a second curved surface 167 is formed at the connection between the rear wall surface 162 and the outer peripheral surface of the rear cylinder portion 97. This second curved surface 167 is recessed towards the front when the accumulator cylinder 90 is viewed from the side. In the illustrated example, the second curved surface 167 is formed as a concave curved surface with a radius of curvature of 2 mm when the accumulator cylinder 90 is viewed from the side.

[0250] It should be noted that the connection between the rear wall surface 162 and the top wall surface 164 forms a curved surface with a radius of curvature of 0.5 mm when viewed from the side of the accumulator cylinder 90. It should also be noted that the radius of curvature of this curved surface is not limited to 0.5 mm and can be appropriately varied.

[0251] like Figure 10 As shown, a pair of sidewall surfaces 163 are configured as inclined surfaces that extend inward in the left-right direction from the outer peripheral surface of the accumulator cylinder 90, i.e., the outer peripheral surface of the front cylinder 96, upward when viewed from the axis O2. Specifically, the pair of sidewall surfaces 163 are formed to be inclined at an acute angle θ3 of less than 90 degrees, i.e., 15 degrees, between the accumulator cylinder 90 and the axis O1 of the longitudinal supply cylinder 10 when viewed from the main view.

[0252] Furthermore, a third curved surface 168 is formed at the connection between the pair of sidewall surfaces 163 and the outer peripheral surface of the front cylinder 96. This third curved surface 168 is recessed downwards when viewed from the main view of the accumulator cylinder 90. In the illustrated example, the third curved surface 168, like the first curved surface 166 and the second curved surface 167, is formed as a concave curved surface with a radius of curvature of 2 mm.

[0253] It should be noted that the connection between the pair of sidewall surfaces 163 and the top wall surface 164 is configured as a curved surface with a radius of curvature of 0.5 mm when viewed from the main view of the accumulator cylinder 90. It should be noted that the radius of curvature of this curved surface is not limited to 0.5 mm and can be appropriately changed.

[0254] like Figure 6 As shown, the upper rib 160 is configured to project upwards by an amount (rib height) such that the top wall surface 164 forms part of the outermost diameter portion of the accumulator cylinder 90. In particular, the rib height of the upper rib 160 is configured to be the highest position (and also the same height position as other structural components) among the other structural components (excluding the cover 100) including the injection cylinder 11, the first connecting plate 110, and the nozzle component 3, in addition to the accumulator cylinder 90.

[0255] Furthermore, in the trigger-type liquid injector 1A of this embodiment, such as Figure 8 and Figure 12 As shown, a connecting reinforcement portion 170 is formed on the rear side of the tube fitting cylinder 13h constituting the inner cylinder 13, which integrally connects the tube fitting cylinder 13h and the large-diameter portion 13a radially. As a result, the strength of the rear side of the annular connecting portion 13c can be improved, thereby increasing rigidity.

[0256] Specifically, the connecting reinforcement 170 is formed as a top-view arc shape extending circumferentially between the tube fitting cylinder 13h and the large-diameter portion 13a, and is integrally formed to connect with the annular connecting portion 13c from below. This effectively increases the strength of the rear portion of the annular connecting portion 13c, thereby improving rigidity. Furthermore, since the connecting reinforcement 170 extends circumferentially, the rear portion of the tube fitting cylinder 13h can be integrally connected to the large-diameter portion 13a over a wider range, thus further improving the rigidity of the rear portion of the annular connecting portion 13c.

[0257] Furthermore, according to the trigger-type liquid injector 1A of this embodiment, since an upper rib 160 is formed in the accumulator cylinder 90, the longitudinal supply cylinder 10 and the accumulator cylinder 90 can be assembled with good settling accuracy during assembly.

[0258] That is, such as Figure 13 As shown, since an upper rib 160 is formed on the accumulator cylinder 90 in such a way as to be located on the axis O1 of the longitudinal supply cylinder 10, when the inner cylinder 13 is inserted into the outer cylinder 12 which is integrally formed with the accumulator cylinder 90 by means of plugging, the upper rib 160 can properly bear the load F caused by plugging from the inner cylinder 13 that is transmitted to the accumulator cylinder 90.

[0259] In particular, such as Figure 6As shown, the upper rib 160 is positioned at the highest point of other structural components (excluding the cover 100), in addition to the accumulator cylinder 90, including the injection barrel 11, the first connecting plate 110, and the nozzle component 3. Therefore, during operation... Figure 13 During the assembly shown, for example, with the upper rib 160 in contact with the setting surface S, the inner cylinder 13 can be inserted into the outer cylinder 12 by means of plugging or the like. Thus, the upper rib 160 can appropriately bear the load F. As a result, the longitudinal supply cylinder 10 and the accumulator cylinder 90 can be assembled with good installation stability and high precision.

[0260] Furthermore, if the upper rib 160 is not formed in the accumulator cylinder 90, such as Figure 7 As shown, this results in the portion of the accumulator cylinder 90 located on the axis O1 of the longitudinal supply cylinder 10 becoming the front cylinder 96, which has a lower height than the rear cylinder 97. Therefore, as Figure 13 As shown, when the inner cylinder 13 is inserted into the outer cylinder 12 by means of plugging, etc., if the upper rib 160 is not formed, the front cylinder 96 may be displaced (bent, etc.) due to the load F generated by the plugging of the inner cylinder 13, which is believed to lead to poor setting between the longitudinal supply cylinder 10 and the accumulator cylinder 90.

[0261] However, according to this embodiment, since the upper rib 160 is provided, such a poor configuration will not occur.

[0262] In addition, such as Figure 9 As shown, the front wall surface 161 of the upper rib 160 is not set to be a vertical surface, such as a right angle, relative to the outer peripheral surface of the front cylinder portion 96 in the accumulator 90, but is set to be an inclined surface with an inclination angle θ1 of 65 degrees. In addition, a first curved surface 166 is formed at the connection between the front wall surface 161 and the outer peripheral surface of the front cylinder portion 96.

[0263] Similarly, the rear wall surface 162 of the upper rib 160 is set as an inclined surface with an inclination angle θ2 of 45 degrees relative to the outer peripheral surface of the rear cylinder 97 of the accumulator 90, and a second curved surface 167 is formed at the connection between the rear wall surface 162 and the outer peripheral surface of the rear cylinder 97.

[0264] Therefore, even if, for example, an impact caused by falling or an impact force caused by contact with the outside is applied to the accumulator cylinder 90, and the accumulator cylinder 90 is displaced in the vertical direction due to the resulting rotational torque, it is possible to suppress defects such as cracking at the connection between the accumulator cylinder 90 and the front wall surface 161 and the rear wall surface 162.

[0265] Specifically, such as Figure 6As shown by arrow F1, when an impact force is applied to the rear end of the rear cylinder 97 of the accumulator cylinder 90 due to a falling impact, the rear cylinder 97 may be displaced downwards, with the connection between the rear cylinder 97 and the longitudinal supply cylinder 10 as the reference point, due to the rotational torque caused by the impact force. Conversely, as... Figure 6 As shown by arrow F2, when an impact force is applied to the nozzle component 3, the rear cylinder 97 may be lifted upwards due to rotational torque, etc.

[0266] When such displacement occurs, local tensile or compressive forces, for example, act on the connection between the front wall 161 and the rear wall 162 of the accumulator cylinder 90 and the upper rib 160, which is believed to cause defects such as cracking.

[0267] However, according to the upper rib 160 of this embodiment, based on the fact that the front wall surface 161 and the rear wall surface 162 are inclined surfaces, the front wall surface 161 is connected to the outer peripheral surface of the front cylinder portion 96 via the first curved surface 166, and the rear wall surface 162 is connected to the outer peripheral surface of the rear cylinder portion 97 via the second curved surface 167. Therefore, it is possible to alleviate local tensile or compressive forces, and it is difficult to cause the above-mentioned adverse conditions.

[0268] Therefore, the rigidity against unexpected external forces (impact forces, etc.) can be improved, and the impact resistance of the trigger-type liquid injector 1A can be enhanced. As a result, a high-quality trigger-type liquid injector 1A with strong rigidity against falling impacts, contact impacts, etc., can be constructed. Furthermore, since the impact resistance can be improved, for example, by making the rear cylinder 97 longer and positioned further rearward than the longitudinal supply cylinder 10, the internal volume (capacity) within the accumulator cylinder 90 can be further ensured. As a result, liquid can be further accumulated within the accumulator cylinder 90, and a trigger-type liquid injector 1A suitable for continuous injection can be constructed.

[0269] Furthermore, the upper rib 160 is inclined not only relative to the front wall surface 161 and the rear wall surface 162, but also relative to a pair of side wall surfaces 163. On this basis, it is connected to the outer peripheral surface of the front cylinder 96 via the third curved surface 168. Therefore, even if the accumulator cylinder 90 is displaced in the left-right direction due to impact force, it can suppress defects such as cracking at the connection between the pair of side wall surfaces 163 and the front cylinder 96.

[0270] As explained above, the trigger-type liquid injector 1A according to this embodiment can improve the fit between the longitudinal supply cylinder 10 and the accumulator cylinder 90 by utilizing the upper rib 160, and can be configured as a trigger-type liquid injector 1A with excellent impact resistance.

[0271] Furthermore, according to the trigger-type liquid injector 1A of this embodiment, such as Figure 8 As shown, a connecting reinforcement 170 is provided on the rear side of the tube fitting cylinder 13h, which integrally connects the large-diameter portion 13a, which fits into the inner side of the opening A1 of the container body A, to the tube fitting cylinder 13h radially. This increases the strength and rigidity of the rear side of the annular connecting portion 13c. Therefore, even if, for example, an impact caused by falling or an impact force from contact with the outside acts on the accumulator cylinder 90, causing the longitudinal supply cylinder 10 to shift by, for example, bending or tilting, displacement of the rear side of the annular connecting portion 13c, such as bending, can be suppressed. This prevents defects such as cracking at the connection between the rear side of the annular connecting portion 13c and the tube fitting cylinder 13h. Furthermore, the connecting reinforcement 170 also increases the rigidity of the tube fitting cylinder 13h, thus suppressing the aforementioned defects. In this respect, the impact resistance of the trigger-type liquid injector 1A can also be improved.

[0272] Furthermore, in the trigger-type liquid injector 1A of this embodiment, such as Figure 6 As shown, a displacement suppression part 150 is provided between the rear cylinder 97 and the longitudinal supply cylinder 10 in the accumulator cylinder 90 to suppress the displacement of the rear cylinder 97 relative to the longitudinal supply cylinder 10. Therefore, even if the accumulator cylinder 90 is subjected to falling impact or the like, the displacement (deformation) of the rear cylinder 97 in the vertical direction can be suppressed.

[0273] Therefore, as mentioned above, such as Figure 6 As shown by arrow F1, even when external forces such as falling impacts act on the rear end of the rear cylinder 97, the displacement suppression part 150 can suppress displacement such as downward bending of the rear cylinder 97. This improves rigidity against unexpected external forces and enhances the impact resistance of the trigger-type liquid injector 1A. Furthermore, by reducing the burden on the upper rib 160 and the connecting reinforcement 170, the occurrence of cracks and the like can be effectively suppressed.

[0274] Furthermore, since the longitudinally ribbed reinforcing ribs 151 connect the longitudinal supply cylinder 10 and the rear cylinder 97 as a single unit, the rigidity of the connection between the longitudinal supply cylinder 10 and the rear cylinder 97 can be effectively improved. Therefore, as... Figure 6 As shown by arrow F2, even when external forces act on the nozzle component 3 due to falling impacts, displacement such as the rear cylinder 97 being lifted upwards due to rotational torque can be effectively suppressed.

[0275] Furthermore, in the trigger-type liquid injector 1A of this embodiment, by having the mounting cylinder 120 externally fitted into the injection cylinder 11, not only is the nozzle component 3 assembled to the injector body 2, but also, with the locking protrusion 126 locked from the rear into the locking hole 111, the second connecting plate 124 overlaps with the first connecting plate 110 from below, and the second connecting plate 124 is sandwiched between the first connecting plate 110 and the injection cylinder 11 in the vertical direction.

[0276] Therefore, it is possible to prevent the nozzle component 3 from falling off relative to the injection barrel 11 (suppression of nozzle falling off) while suppressing the movement of the nozzle component 3 relative to the injector body 2 in the vertical direction.

[0277] The embodiments of the present invention have been described above; however, these embodiments are merely illustrative and are not intended to limit the scope of the invention. The embodiments can be implemented in various other ways, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. The embodiments and their variations may include, for example, content that is readily conceived by those skilled in the art, substantially the same content, or content of equivalent scope.

[0278] For example, in the above embodiment, a reinforcing rib 151 integrally formed with respect to the longitudinal supply cylinder 10 and the rear cylinder 97 is used to suppress the displacement of the rear cylinder 97 relative to the longitudinal supply cylinder 10, but it is not limited to the reinforcing rib 151.

[0279] For example, such as Figure 3 and Figure 4 As shown, the displacement suppression unit 150 may also include a reinforcing body 155 mounted relative to the longitudinal supply cylinder 10 and the rear cylinder 97, and the displacement of the rear cylinder 97 relative to the longitudinal supply cylinder 10 is suppressed by the separate reinforcing body 155.

[0280] It should be noted that, in Figure 3 In the diagram, dotted shading is used to make it easier to observe reinforcement 155.

[0281] The reinforcing body 155 includes: a first reinforcing body 156 which is mounted from the rear to the longitudinal supply cylinder 10 and retains the longitudinal supply cylinder 10; and a second reinforcing body 157 which is integrally formed with the first reinforcing body 156 and mounted from below to the rear cylinder 97 and retains the rear cylinder 97.

[0282] The first reinforcing body 156 has a top-view C-shaped first clamping portion 158 that surrounds the small-diameter portion 12b of the outer cylinder 12 forming the longitudinal supply cylinder portion 10 from the radially outer side. The first clamping portion 158 is configured to be elastically deformable in the radial direction, for example, and is configured to elastically retain the small-diameter portion 12b when it is installed from the rear.

[0283] The second reinforcement 157 has a second clamping portion 159 in a side-view C-shape, which surrounds the rear cylinder portion 97 from the radially outer side. The second clamping portion 159 is configured to be elastically deformable in the radial direction, for example, and is configured to elastically retain the small diameter portion 12b when it is mounted from below.

[0284] Even with the reinforcement 155 configured as described above, the longitudinal supply cylinder 10 and the rear cylinder 97 can be integrated to improve overall rigidity. Specifically, by installing the first reinforcement 156 from the rear onto the longitudinal supply cylinder 10 and the second reinforcement 157 from below onto the rear cylinder 97, the reinforcement 155 can be used to connect the longitudinal supply cylinder 10 and the rear cylinder 97 as a single unit. Therefore, the same effect as the embodiment described above can be achieved.

[0285] In particular, because of the use of the separate reinforcing body 155, it is difficult to affect the formability of the longitudinal supply cylinder 10 and the rear cylinder 97, and reinforcement can be achieved while maintaining the liquid ejection performance appropriately. In addition, since the reinforcing body 155 can be designed arbitrarily and with a high degree of freedom, displacement of the rear cylinder 97 can be easily and effectively suppressed.

[0286] It should be noted that even when using reinforcement 155, such as Figure 5 As shown, the longitudinal supply cylinder 10 and the rear cylinder 97 can be connected as one unit by using the reinforcing rib 151, and the reinforcing body 155 can be further used.

[0287] Furthermore, the above embodiment shows a structure in which the communication hole 95 is opened when the accumulating plunger 80 closes the communication hole 95 and resists the force-applying member 81 from moving backward. However, a structure in which the supply hole 91 formed in the accumulating cylinder 90 is closed by the accumulating plunger 80 and the supply hole 91 is opened when resisting the force-applying member 81 from moving backward may also be adopted.

[0288] Furthermore, in the second embodiment described above, the upper rib 160 is formed with an inclination angle θ1 of 65 degrees for the front wall surface 161. However, it is not limited to 65 degrees as long as the inclination angle θ1 is an acute angle (less than 90 degrees). Preferably, the inclination angle θ1 is set to an angle of 45 degrees or more. In this case, the rib height of the upper rib 160 can be easily ensured, and the rigidity of the upper rib 160 can be improved. Therefore, during assembly, the load transmitted to the accumulator cylinder 90 from the inner cylinder 13 can be more reliably supported, and the longitudinal supply cylinder 10 and the accumulator cylinder 90 can be assembled with better installation and higher precision.

[0289] It should be noted that the same applies to the rear wall 162 and the pair of side walls 163.

[0290] Furthermore, in the second embodiment described above, the upper rib 160 is formed in a concave curved surface with a radius of curvature of 2 mm for the first curved surface 166, but this is not a limitation. Preferably, the first curved surface 166 is formed in a concave curved surface with a radius of curvature of 1.5 mm or more, and more preferably, with a radius of curvature of 2 mm or more.

[0291] It should be noted that the same applies to the second curve face 167 and the third curve face 168.

[0292] Furthermore, when the radii of curvature of the first curved surface 166, the second curved surface 167, and the third curved surface 168 are set to be less than 1.5 mm, boundary lines (intersecting ridges) are prone to appear at the connection points between the front wall surface 161, the rear wall surface 162, and the pair of side wall surfaces 163 and the cylinder 93 in the accumulator 90. For example, these lines may form a V-shaped notch (cut) in cross-section. As a result, when impact forces such as falling impacts are applied to the accumulator 90, stress concentration is likely to occur at the notch-shaped parts, which can lead to cracking and other damage at the connection points between the upper rib 160 and the cylinder 93.

[0293] However, in the second embodiment, since the radii of curvature of the first curved surface 166, the second curved surface 167, and the third curved surface 168 are set to 1.5 mm or more, it is difficult to produce the aforementioned adverse conditions.

[0294] Industrial availability

[0295] According to the present invention, a trigger-type liquid injector with excellent impact resistance can be provided.

Claims

1. A trigger-type liquid injector, characterized in that, have: The injector body is mounted on a container holding liquid; and A nozzle component, which is mounted at the front end of the injector body, and has a spray hole for spraying liquid forward. The injector body has: A longitudinal supply cylinder extends vertically and draws liquid from the container. The trigger mechanism has a trigger section disposed in front of the longitudinal supply cylinder in such a way that it can move backward when a force is applied forward. The rearward movement of the trigger section causes liquid to flow from inside the longitudinal supply cylinder toward the injection hole side. An accumulator cylinder, whose rearward movement via the trigger section supplies liquid passing through the longitudinal supply cylinder inward; and An accumulator plunger is disposed within the accumulator cylinder in such a way that it is axially movable along the central axis of the accumulator cylinder, moves toward one side of the axial direction as liquid is supplied into the accumulator cylinder, and is subjected to force toward the other side. The accumulating cylinder is positioned above the longitudinal supply cylinder and intersects the central axis of the longitudinal supply cylinder, and is configured to protrude further rearward than the longitudinal supply cylinder. A displacement suppression part is provided between the rear cylinder portion, which protrudes further rearward than the longitudinal supply cylinder portion, and the longitudinal supply cylinder portion in the accumulation cylinder body to suppress the displacement of the rear cylinder portion relative to the longitudinal supply cylinder portion.

2. The trigger-type liquid injector according to claim 1, characterized in that, The displacement suppression part has a reinforcing rib, which is integrally formed on the longitudinal supply cylinder and the rear cylinder in such a way that it connects the longitudinal supply cylinder and the rear cylinder as one unit.

3. The trigger-type liquid injector according to claim 1 or 2, characterized in that, The displacement suppression part includes a reinforcing body, which is installed on the longitudinal supply cylinder part and the rear cylinder part. The reinforcing body has the following features: A first reinforcing member is mounted from the rear to the longitudinal supply cylinder and holds the longitudinal supply cylinder in place; and The second reinforcing body is integrally formed with the first reinforcing body and is mounted from below on the rear cylinder portion, and retains the rear cylinder portion.

4. The trigger-type liquid injector according to claim 1, characterized in that, The longitudinal supply cylinder section includes an outer cylinder integrally formed in the accumulating cylinder body and an inner cylinder fitted inside the outer cylinder. An upper rib is integrally formed on the outer peripheral surface of the upper end of the accumulating cylinder. The upper rib protrudes upward and is disposed on the central axis of the longitudinal supply cylinder, extending along the axial direction. The upper rib has a first wall surface facing the opposite side of the axial direction and is inclined in a manner that extends upward from the outer peripheral surface of the accumulator cylinder toward one side of the axial direction. A first curved surface is formed at the connection between the first wall surface and the outer peripheral surface of the storage cylinder. When the storage cylinder is viewed from the side, the first curved surface is recessed on the side facing the axial direction. The first curved surface is formed as a concave curved surface with a radius of curvature of 1.5 mm or more when the accumulator is viewed from the side.

5. The trigger-type liquid injector according to claim 4, characterized in that, When viewed from the side, the inclination angle of the first wall surface relative to the outer peripheral surface of the storage cylinder is set to 45 degrees or more.

6. The trigger-type liquid injector according to claim 4 or 5, characterized in that, The upper rib has a second wall surface facing one side of the axial direction and inclined in a manner that extends upward from the outer peripheral surface of the accumulator cylinder toward the other side of the axial direction. A second facet is formed at the connection between the second wall surface and the outer peripheral surface of the accumulator cylinder, and the second facet is recessed toward the other side of the axial direction when the accumulator cylinder is viewed from the side.

Images