Trigger-type liquid ejector

Abstract

To provide a trigger-type liquid ejector having a structure capable of reducing a metal material to be used.SOLUTION: A trigger-type liquid ejector (1) includes an ejector main body (2) and a nozzle member. The ejector main body includes: a vertical supply tube portion (10); a trigger mechanism that causes a liquid to flow from inside the vertical supply tube portion toward an ejection hole side by rearward movement of a trigger portion; a reservoir cylinder (60) into which the liquid passing through inside the vertical supply tube portion is supplied by the rearward movement of the trigger portion; a reservoir plunger (70) that is disposed in the reservoir cylinder movably in an axial direction along a central axis of the reservoir cylinder, moves toward one side in the axial direction as the liquid is supplied into the reservoir cylinder, and is biased toward the other side in the axial direction; and an elastic bag body (90) that is elastically deformable and the inside of which is hermetically sealed. The elastic bag body is compressed to be elastically deformed as the reservoir plunger moves toward one side, and biases the reservoir plunger toward the other side.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a trigger-type liquid ejector.

Background Art

[0002] There is known a trigger-type liquid ejector including a storage cylinder into which liquid passing through a vertical supply cylinder is supplied by moving a trigger portion rearward, and a storage plunger disposed movably in the axial direction along its central axis in the storage cylinder, the storage plunger moving toward one side in the axial direction as the liquid is supplied into the storage cylinder and being biased toward the other side in the axial direction (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the trigger-type liquid ejector as described above, for reasons such as cost reduction and weight reduction in manufacturing, there is a demand to reduce the metal materials used in the trigger-type liquid ejector. However, in the trigger-type liquid ejector as described above, it has been necessary to provide a metal coil spring to bias the storage plunger toward the other side in the axial direction. Therefore, there has been a problem that the metal materials used in the trigger-type liquid ejector cannot be sufficiently reduced.

[0005] One aspect of the present invention is, in view of the above circumstances, to provide a trigger-type liquid ejector having a structure capable of reducing the metal materials used as one of the objectives.

Means for Solving the Problems

[0006] One aspect of the trigger-type liquid ejector of the present invention includes an ejector body attached to a container body containing a liquid, and a nozzle member formed with an ejection hole for ejecting the liquid. The ejector body has a vertical supply cylinder portion for sucking up the liquid in the container body, and a trigger portion disposed so as to be movable rearward in a forwardly biased state. By the rearward movement of the trigger portion, a trigger mechanism for circulating the liquid from inside the vertical supply cylinder portion toward the ejection hole side, a storage cylinder into which the liquid that has passed through the vertical supply cylinder portion is supplied when the trigger portion moves rearward, a storage plunger disposed movably in the axial direction along the central axis of the storage cylinder in the storage cylinder, and moving toward one side in the axial direction as the liquid is supplied into the storage cylinder, and biased toward the other side in the axial direction, and an elastic bag body that is elastically deformable and has a sealed interior. The elastic bag body is elastically deformed in compression as the storage plunger moves toward the one side, and biases the storage plunger toward the other side. A trigger-type liquid ejector.

[0007] According to one aspect of the trigger-type liquid ejector of the present invention, when the elastic bag body is elastically deformed in compression and the air inside the sealed elastic bag body is compressed, a restoring force is generated in the elastic bag body, and a force in the direction of the other side can be applied to the storage plunger via the elastic bag body. Thereby, the storage plunger can be biased toward the other side without using a metal coil spring. Therefore, the amount of metal material used in the trigger-type liquid ejector can be reduced. Also, the manufacturing cost of the elastic bag body is likely to be lower than that of a metal coil spring. Therefore, by using the elastic bag body instead of the metal coil spring, the manufacturing cost of the trigger-type liquid ejector can be easily reduced. Further, the elastic bag body is likely to be lighter than a metal coil spring. Therefore, by using the elastic bag body instead of the metal coil spring, the trigger-type liquid ejector can be easily lightened. Thereby, the energy required for transporting the trigger-type liquid ejector can be easily reduced.

[0008] The ejector body may have a cylindrical guide member extending in the axial direction, and the elastic bag body may be housed inside the guide member. According to this configuration, it is easy to limit the deformation manner when the elastic bag body elastically deforms and the deformation manner when the elastic bag body restores and deforms by the guide member, and it is possible to suppress the elastic bag body from deforming into an unintended shape. Thereby, the elastic bag body can suitably apply the biasing force in the axial direction to the storage plunger.

[0009] The elastic bag body may be configured to have a bellows portion extending in the axial direction. According to this configuration, the elastic bag body can be easily elastically deformed in the axial direction at the bellows portion. Thereby, when the elastic bag body is pushed to the one side by the storage plunger, the elastic bag body can be easily compressed and elastically deformed. Further, since the bellows portion elastically deforms in the axial direction, it is possible to suppress the elastic bag body from elastically deforming into an unintended shape. Therefore, even without providing the guide member, the elastic bag body can suitably apply the biasing force in the axial direction to the storage plunger.

[0010] The storage plunger may have a protrusion protruding to the one side, and the elastic bag body may be configured to be pushed to the one side by the protrusion as the storage plunger moves to the one side. According to this configuration, pressure can be suitably applied to the elastic bag body via the protrusion, and the elastic bag body can be easily compressed and elastically deformed.

[0011] A concave portion recessed to the one side may be formed in a portion of the elastic bag body that is pushed to the one side by the protrusion. According to this configuration, compared with the case where the concave portion is not formed, the relative position of the elastic bag body with respect to the protrusion of the elastic bag body is suppressed from shifting. Thereby, the protrusion can push the elastic bag body more suitably in the axial direction, and the elastic bag body can be suitably compressed and elastically deformed.

Advantages of the Invention

[0012] According to one aspect of the present invention, the amount of metal material used in a trigger-type liquid ejector can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

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Figure 6

Figure 7

Figure 8

[0014] Hereinafter, a trigger-type liquid ejector according to an embodiment of the present invention will be described with reference to the drawings. Note that the scope of the present invention is not limited to the following embodiments and can be arbitrarily changed within the scope of the technical idea of the present invention. Also, in the following drawings, in order to make each configuration easier to understand, the scale and number, etc. of each structure may be different from those in the actual structure.

[0015] <First Embodiment> As shown in FIG. 1, the trigger-type liquid ejector 1 of the present embodiment includes an ejector body 2 attached to a container body A in which a liquid is stored, and a nozzle member 3 in which an ejection hole 133 for ejecting the liquid is formed. Each component of the trigger-type liquid ejector 1 is, unless otherwise specified, a molded product made of, for example, synthetic resin. The ejector body 2 has a vertical supply cylinder portion 10, a mounting cap 14, an injection cylinder portion 11, a trigger mechanism 50, a storage cylinder 60, a storage plunger 70, a biasing member 100 having a guide member 80 and an elastic bag body 90, a support member 40, a storage valve 20, and a cover body 140. The storage cylinder 60 is formed in a toped cylindrical shape, and the storage plunger 70 and the biasing member 100 are disposed inside the storage cylinder 60. The cover body 140 covers the entire vertical supply cylinder portion 10, the injection cylinder portion 11, and the storage cylinder 60 from both the left-right direction and above, which will be described later.

[0016] In the present embodiment, the central axis of the vertical supply cylinder portion 10 is referred to as axis O1. The direction along axis O1 (Z-axis direction) is referred to as the vertical direction. In the vertical direction, the container body A side (-Z side) is referred to as the lower side or the downward side, and the opposite side (+Z side) is referred to as the upper side or the upward side. In a plan view seen in the vertical direction, one direction (X-axis direction) intersecting axis O1 is referred to as the front-rear direction, and a direction (Y-axis direction) orthogonal to both the vertical direction and the front-rear direction is referred to as the left-right direction. In the front-rear direction, the side (+X side) where the ejection hole 133 formed in the nozzle member 3 opens is referred to as the front side or the forward side, and the opposite side (-X side) is referred to as the rear side or the rearward side.

[0017] Also, in the present embodiment, the central axis of the storage cylinder 60 is referred to as axis O2. In the present embodiment, axis O2 extends in the front-rear direction. That is, in the present embodiment, the front-rear direction corresponds to the axial direction along the central axis of the storage cylinder 60. Also, in the present embodiment, the rear side (-X side) corresponds to one side in the axial direction along the central axis of the storage cylinder 60. Also, in the present embodiment, the front side (+X side) corresponds to the other side in the axial direction along the central axis of the storage cylinder 60. Note that the axial direction along axis O2 does not necessarily coincide with the front-rear direction.

[0018] The vertical supply cylinder portion 10 extends in the vertical direction and is a portion that sucks up the liquid in the container body A. The vertical supply cylinder portion 10 has a toped cylindrical outer cylinder 12 and an inner cylinder 13 fitted inside the outer cylinder 12. In the present embodiment, the outer cylinder 12 and the inner cylinder 13 are formed in a two-stage cylindrical shape with a reduced diameter from the bottom upward. The axis O1 of the vertical supply cylinder portion 10 composed of the outer cylinder 12 and the inner cylinder 13 is eccentric rearward with respect to the container axis O3 of the container body A. 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 portion of the large-diameter portion 12a and the lower end portion of the small-diameter portion 12b. The small-diameter portion 12b is a toped cylindrical shape coaxially arranged with the axis O1. As shown in FIG. 2, the top wall portion 12d of the small-diameter portion 12b is integrally formed with the storage cylinder 60.

[0019] The liquid supplied to the inside of the storage cylinder 60 passes through the inner cylinder 13. As shown in FIG. 1, 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 portion of the large-diameter portion 13a and the lower side portion of the small-diameter portion 13b.

[0020] The large-diameter portion 13a is located inside the large-diameter portion 12a of the outer cylinder 12. The lower end portion of the large-diameter portion 13a protrudes downward more than the lower end portion of the large-diameter portion 12a of the outer cylinder 12. An annular flange portion 13d protruding outward in the radial direction of the large-diameter portion 13a 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. The flange portion 13d is disposed inside a mounting cap 14 that is mounted (for example, screwed) on the mouth portion A1 of the container body A. The flange portion 13d is sandwiched in the vertical direction by the mounting cap 14 and the upper end opening edge of the mouth portion A1 of the container body A.

[0021] The small-diameter portion 13b is cylindrical and arranged coaxially with the axis O1, and is open in both the vertical directions. The upper end portion of the small-diameter portion 13b is the upper end portion of the inner cylinder 13 and is an upper end opening portion 13g that opens upward. The small-diameter portion 13b is located inside the small-diameter portion 12b of the outer cylinder 12. The upper end portion of the small-diameter portion 13b faces the top wall portion 12d of the outer cylinder 12 with a slight gap therebelow. The upper part of a pipe 15 extending in the vertical direction is fitted inside the lower side portion of the small-diameter portion 13b. The pipe 15 is arranged inside the container body A. The lower end opening of the pipe 15 is located at the bottom (not shown) of the container body A. Liquid from the pipe 15 flows into the small-diameter portion 13b inside the container body A. The annular connecting portion 13c is located below the annular connecting portion 12c of the outer cylinder 12 while securing a gap S1 therebetween.

[0022] As shown in FIG. 2, a first valve seat portion 13e is formed on the inner peripheral surface of the inner cylinder 13. In the present embodiment, the first valve seat portion 13e is formed by a step such that the inner diameter of the upper portion of the inner cylinder 13 above the first valve seat portion 13e is larger than the inner diameter of the lower portion of the inner cylinder 13 below the first valve seat portion 13e. A storage valve 20 seats on the first valve seat portion 13e from above. As shown in FIG. 1, a second valve seat portion 16 that protrudes radially inward about the axis O1 and whose diameter decreases downward is formed on the portion of the inner peripheral surface of the inner cylinder 13 that is located below the first valve seat portion 13e and above the upper end of the pipe 15.

[0023] A ball valve 36 is arranged inside the inner cylinder 13 so as to be movable in the vertical direction. In the present embodiment, the ball valve 36 is arranged in the portion inside the small-diameter portion 13b of the inner cylinder 13 that is located above the second valve seat portion 16. The ball valve 36 seats on the upper surface of the second valve seat portion 16 in a separable manner. The ball valve 36 communicates and blocks the space above the second valve seat portion 16 and the space below the second valve seat portion 16 inside the inner cylinder 13.

[0024] A recovery passage 17 is provided between the outer cylinder 12 and the inner cylinder 13. The recovery passage 17 extends in the vertical direction and opens in both the upper and lower directions. In the present embodiment, the recovery passage 17 is located behind the axis O1. The recovery passage 17 is formed, for example, in a longitudinal groove shape on the outer peripheral surface of the small-diameter portion 13b of the inner cylinder 13. The lower end portion of the recovery passage 17 communicates with the inside of the container body A through the large-diameter portion 13a.

[0025] As shown in FIG. 2, a connecting cylinder portion 30 extending forward is provided at the upper end portion of the vertical supply cylinder portion 10. The rear end portion of the connecting cylinder portion 30 is connected to the outer cylinder 12. The connecting cylinder portion 30 is a bottomed cylinder shape that opens forward. The bottom portion 31 of the connecting cylinder portion 30 is integrally formed with the upper end portion of the outer cylinder 12. A through hole 31a penetrating the bottom portion 31 in the front-rear direction is formed in the lower side portion of the bottom portion 31. The through hole 31a communicates with a through hole 13f formed in the upper end portion of the inner cylinder 13. The through hole 13f is formed in a portion of the small-diameter portion 13b of the inner cylinder 13 that is located above the first valve seat portion 13e. Thereby, the inside of the connecting cylinder portion 30 communicates with the inside of the portion of the inner cylinder 13 that is located above the first valve seat portion 13e through the through holes 31a and 13f. A closing plug 32 that fits tightly into the connecting cylinder portion 30 is provided at the front end portion of the connecting cylinder portion 30. The front end opening of the connecting cylinder portion 30 is closed by the closing plug 32. As shown in FIG. 1, a cylinder cylinder portion 33 is provided below the connecting cylinder portion 30 at an interval. The cylinder cylinder portion 33 protrudes forward from the small-diameter portion 12b of the outer cylinder 12 and opens forward. The rear side portion of the lower end portion of the cylinder cylinder portion 33 is integrally formed with the annular connecting portion 12c.

[0026] A fitting cylinder portion 34 that protrudes forward from the small-diameter portion 12b of the outer cylinder 12 is provided inside the cylinder cylinder portion 33. The fitting cylinder portion 34 is arranged coaxially with the cylinder cylinder portion 33. The front end portion of the fitting cylinder portion 34 is located behind the front end portion of the cylinder cylinder portion 33. The fitting cylinder portion 34 opens in both the front-rear directions. In a front portion between the inner peripheral surface of the outer cylinder 12 and the outer peripheral surface of the inner cylinder 13 in the vertical supply cylinder portion 10, a connection passage 18 extending in the vertical direction is formed. The connection passage 18 communicates the inside of the fitting cylinder portion 34 and the inside of the large-diameter portion 13a.

[0027] The injection cylinder portion 11 extends along the front-rear direction, and the inside of the injection cylinder portion 11 communicates with the inside of the vertical supply cylinder portion 10. The injection cylinder portion 11 extends forward from the storage cylinder 60 and guides the liquid in the vertical supply cylinder portion 10 to the ejection hole 133. Note that the injection cylinder portion 11 is arranged such that, for example, an axis O4 passing through the center of the injection cylinder portion 11 is positioned above the axis O2 of the storage cylinder 60.

[0028] The trigger mechanism 50 includes a trigger portion 51, a cylinder 53, a piston 52, and a coil spring 54. The trigger portion 51 extends downward from a portion of the cover body 140 that is located below the injection cylinder portion 11. The trigger portion 51 is arranged to be swingable (movable) rearward in a forward-biased state in front of the vertical supply cylinder portion 10. The trigger portion 51 is swingable in the front-rear direction about a rotary shaft portion 141 provided on the cover body 140. As the trigger portion 51 swings in the front-rear direction, the piston 52 is movable back and forth. The trigger mechanism 50 causes the liquid to flow from the inside of the vertical supply cylinder portion 10 through the inside of the injection cylinder portion 11 toward the ejection hole 133 side by swinging (moving) the trigger portion 51 rearward.

[0029] The cylinder 53 includes an outer cylinder portion 53a that opens forward, a rear wall portion 53b that closes the rear opening of the outer cylinder portion 53a, a cylindrical piston guide 53c that projects forward from the central portion of the rear wall portion 53b, and a cylindrical communication cylinder portion 53d that projects rearward from a portion of the rear wall portion 53b that is located above the piston guide 53c and opens rearward. The outer cylinder part 53a is fitted inside the cylinder cylinder part 33. The inner peripheral surface of the cylinder cylinder part 33 and the outer peripheral surface of the outer cylinder part 53a are in close contact at both ends in the front-rear direction. On the other hand, an annular gap S2 is secured in the intermediate part located between both ends in the front-rear direction among the space between the inner peripheral surface of the cylinder cylinder part 33 and the outer peripheral surface of the outer cylinder part 53a. A spring receiving member 130 is attached to the front end opening of the outer cylinder part 53a.

[0030] A first vent hole 53f that communicates the inside of the outer cylinder part 53a with the above-mentioned gap S2 is formed in the outer cylinder part 53a. A second vent hole 12f that communicates the above-mentioned gap S2 with a gap S1 defined between the annular connecting part 12c of the outer cylinder 12 and the annular connecting part 13c of the inner cylinder 13 is formed in the annular connecting part 12c of the outer cylinder 12. Further, a third vent hole 13h that communicates the above-mentioned gap S1 with the inside of the large-diameter part 13a is formed in the annular connecting part 13c of the inner cylinder 13.

[0031] The rear end part of the communication cylinder part 53d penetrates through a through hole formed in the outer cylinder 12 and a through hole formed in the inner cylinder 13 and protrudes into the inside of the inner cylinder 13. More specifically, the rear end part of the communication cylinder part 53d protrudes into the inside of the part of the small-diameter part 13b of the inner cylinder 13 that is located between the first valve seat part 13e and the second valve seat part 16 in the vertical direction. The communication cylinder part 53d is tightly fitted in the through hole formed in the outer cylinder 12 and the through hole formed in the inner cylinder 13. The inside of the inner cylinder 13 in the vertical supply cylinder part 10 and the inside of the cylinder 53 communicate with each other through the communication cylinder part 53d. More specifically, the inside of the cylinder 53 communicates through the communication cylinder part 53d with the space located between the first valve seat part 13e and the second valve seat part 16 in the inner cylinder 13. Therefore, the ball valve 36 that is detachably seated on the second valve seat part 16 can switch the communication and cutoff between the inside of the container body A and the inside of the cylinder 53.

[0032] The ball valve 36 closes when pressurized inside the cylinder 53 to cut off the communication between the inside of the container body A and the vertical supply cylinder part 10, and opens by displacing upward when depressurized inside the cylinder 53 to allow the communication between the inside of the container body A and the vertical supply cylinder part 10. Thus, when the ball valve 36 is closed, the communication between the inside of the container body A and the inside of the cylinder 53 through the vertical supply cylinder part 10 is cut off, and when the ball valve 36 is open, the communication between the inside of the container body A and the inside of the cylinder 53 through the vertical supply cylinder part 10 is allowed. Since the storage valve 20 is arranged above the ball valve 36, it is possible to regulate further displacement of the ball valve 36 upward by the storage valve 20.

[0033] The piston guide 53c is tubular and has openings on both sides in the front-rear direction. The piston guide 53c is located inside the outer cylinder part 53a. The front end part of the piston guide 53c is located behind the front end part of the outer cylinder part 53a. The fitting cylinder part 34 is fitted into the rear end part of the piston guide 53c from the rear. The front end part of the fitting cylinder part 34 projects inside the piston guide 53c. The piston guide 53c and the fitting cylinder part 34 are arranged coaxially. An annular recessed part 53e is formed on the outer peripheral surface at the rear end part of the piston guide 53c.

[0034] The piston 52 is arranged inside the cylinder 53 so as to be movable in the front-rear direction. The piston 52 moves in the front-rear direction in conjunction with the swing of the trigger part 51. Along with the movement of the piston 52 in the front-rear direction, the inside of the cylinder 53 is pressurized and depressurized. The piston 52 is arranged coaxially with the cylinder 53 and is a toped cylindrical shape that opens rearward. The piston 52 is biased forward by the biasing force of the coil spring 54 together with the trigger part 51. The piston 52 moves rearward and is pushed into the cylinder 53 as the trigger part 51 swings rearward. The piston 52 has a piston main body part 52a that opens rearward and into which the piston guide 53c is inserted, and a sliding cylinder part 52b that projects radially outward from the rear end part of the piston main body part 52a and is in sliding contact with the inner peripheral surface of the outer cylinder part 53a.

[0035] The inner diameter of the piston main body portion 52a is formed to be slightly larger than the outer diameter of the piston guide 53c. The inner peripheral surface of the piston main body portion 52a and the outer peripheral surface of the piston guide 53c face each other with a slight gap in the radial direction of the piston 52. The front end portion of the piston main body portion 52a is connected to the trigger portion 51. An annular inner lip portion 52c that protrudes toward the inner side in the radial direction of the piston main body portion 52a and is in sliding contact with the outer peripheral surface of the piston guide 53c is formed at the rear end portion of the piston main body portion 52a. Thereby, a sealing property is ensured between the inner lip portion 52c and the outer peripheral surface of the piston guide 53c.

[0036] Here, when the piston 52 moves rearward and the inner lip portion 52c reaches a position where it faces the recessed portion 53e in the radial direction, a slight gap is formed between the inner lip portion 52c and the recessed portion 53e. Thereby, through the gap between the inner lip portion 52c and the recessed portion 53e, the inside of the outer cylinder portion 53a of the cylinder 53 and the gap between the inner peripheral surface of the piston main body portion 52a and the outer peripheral surface of the piston guide 53c communicate with each other. Thereby, the inside of the outer cylinder portion 53a of the cylinder 53 communicates with the fitting cylinder portion 34 through the inside of the piston guide 53c. In the present embodiment, the inner lip portion 52c reaches a position where it faces the recessed portion 53e in the radial direction when the piston 52 moves to the rearmost position.

[0037] The sliding cylinder portion 52b is formed in a tapered shape that gradually increases in diameter from the central portion in the front-rear direction toward the front and rear. The sliding cylinder portion 52b has outer lip portions 52d located at both end portions in the front-rear direction. The outer lip portions 52d are in close sliding contact with the inner peripheral surface of the outer cylinder portion 53a. Thereby, a sealing property is ensured between the outer lip portions 52d and the inner peripheral surface of the outer cylinder portion 53a.

[0038] The piston 52 is positioned at the foremost position correspondingly when the trigger part 51 is at the foremost swing position (foremost movement position), and the sliding cylinder part 52b closes the first vent hole 53f formed in the outer cylinder part 53a. Then, when the piston 52 moves rearward by a predetermined amount from the foremost position due to the rearward swing of the trigger part 51, the sliding cylinder part 52b opens the first vent hole 53f to the outside of the trigger-type liquid ejector 1. Thereby, the inside of the container body A communicates with the outside of the trigger-type liquid ejector 1 through the third vent hole 13h formed in the annular connecting part 13c of the inner cylinder 13, the second vent hole 12f formed in the annular connecting part 12c of the outer cylinder 12, and the first vent hole 53f.

[0039] The coil spring 54 extends in the front-rear direction. The coil spring 54 is made of, for example, metal. The coil spring 54 surrounds the piston main body part 52a. The rear end part of the coil spring 54 is supported by the spring receiving member 130. The front end part of the coil spring 54 contacts the trigger part 51 from behind. The coil spring 54 biases the trigger part 51 forward. The coil spring 54 applies a forward biasing force to the piston 52 connected to the trigger part 51 via the trigger part 51.

[0040] As shown in FIG. 2, the storage cylinder 60 is disposed above the connection cylinder part 30. Inside the storage cylinder 60, the liquid that has passed through the vertical supply cylinder part 10 and the connection cylinder part 30 is supplied by the rearward swing (movement) of the trigger part 51. The storage cylinder 60 extends in the front-rear direction and straddles the vertical supply cylinder part 10 in the front-rear direction. The storage cylinder 60 is disposed, for example, parallel to the connection cylinder part 30 and the cylinder barrel part 33.

[0041] The storage cylinder 60 is formed to protrude rearward from the vertical supply cylinder portion 10. A part of the lower portion of the storage cylinder 60 is integrally formed with the upper end portion of the vertical supply cylinder portion 10 and the upper end portion of the connection cylinder portion 30. The storage cylinder 60 has a front wall portion 62 disposed above the front side portion of the connection cylinder portion 30 and a cylinder tube 63 extending rearward from the front wall portion 62, and is formed in a cylindrical shape that opens rearward as a whole. A communication hole 62a penetrating the front wall portion 62 in the front-rear direction is formed in the front wall portion 62. The communication hole 62a is, for example, a circular hole coaxially arranged with the axis O2. The communication hole 62a communicates the inside of the storage cylinder 60 with the inside of the injection cylinder portion 11.

[0042] The cylinder tube 63 has a front cylinder portion 63a connected to the front wall portion 62, a rear cylinder portion 63b formed with a larger outer diameter and inner diameter than the front cylinder portion 63a and located rearward of the front cylinder portion 63a, and a connecting portion 63c connecting the front cylinder portion 63a and the rear cylinder portion 63b in the front-rear direction, and is formed in a multi-stage cylindrical shape that gradually increases in diameter from the front to the rear. The connecting portion 63c gradually increases in diameter from the front to the rear. The rear cylinder portion 63b is disposed rearward of the vertical supply cylinder portion 10. The storage cylinder 60 is formed with a supply hole 61, a communication groove 64, and a recovery hole 69. The supply hole 61 communicates with the inside of the connection cylinder portion 30. In the present embodiment, the supply hole 61 is formed in the lower portion of the front end portion of the front cylinder portion 63a. In the storage cylinder 60, the liquid that has passed through the inside of the vertical supply cylinder portion 10 and the inside of the connection cylinder portion 30 is supplied through the supply hole 61.

[0043] The communication groove 64 is formed on the inner peripheral surface at the rear end portion of the front cylinder portion 63a. The communication groove 64 extends in the front-rear direction and opens rearward. A plurality of communication grooves 64 are arranged at intervals around the axis O2. The recovery hole 69 is formed in the connecting portion 63c. The recovery hole 69 penetrates the lower wall portion of the storage cylinder 60 in the vertical direction. The front side portion of the recovery hole 69 is formed in the top wall portion 12d of the outer cylinder 12. The recovery hole 69 communicates with a recovery passage 17 provided in the ejector body 2. The recovery passage 17 communicates the recovery hole 69 with the inside of the container body A. The rear end portion of the communication groove 64 located on the lower side among the plurality of communication grooves 64 is connected to the recovery hole 69.

[0044] The support member 40 is inserted into the storage cylinder 60 from the rear end opening of the storage cylinder 60. The support member 40 is formed in a cylindrical shape coaxially arranged with the axis O2. The support member 40 has a first fitting cylinder portion 41, a second fitting cylinder portion 42, and a bottom portion 43. The first fitting cylinder portion 41 is arranged coaxially with the axis O2 and is in a cylindrical shape that opens forward. The first fitting cylinder portion 41 is fitted into the rear end opening of the storage cylinder 60.

[0045] The second fitting cylinder portion 42 is located inside the first fitting cylinder portion 41. The second fitting cylinder portion 42 is in a cylindrical shape coaxially arranged with the axis O2. The second fitting cylinder portion 42 has a top wall portion in the front and opens in the rear. The outer peripheral surface of the second fitting cylinder portion 42 is arranged radially inward about the axis O2 away from the inner peripheral surface of the first fitting cylinder portion 41. The front end portion of the second fitting cylinder portion 42 is located rearward of the front end portion of the first fitting cylinder portion 41. The second fitting cylinder portion 42 is airtightly fitted into the rear end portion of an elastic bag body 90 described later. The bottom portion 43 is in an annular shape coaxially arranged with the axis O2. The bottom portion 43 connects the rear end portion of the first fitting cylinder portion 41 and the rear end portion of the second fitting cylinder portion 42.

[0046] The storage plunger 70 is disposed within the storage cylinder 60 so as to be movable in the axial direction (front-rear direction) along the central axis (axis O2) of the storage cylinder 60. The storage plunger 70 moves rearward as the liquid is supplied into the storage cylinder 60. The storage plunger 70 is formed in a cylindrical shape extending in the front-rear direction. The storage plunger 70 is arranged coaxially with the axis O2 and has a substantially cylindrical shape that opens rearward. The storage plunger 70 slides back and forth within the storage cylinder 60.

[0047] The storage plunger 70 includes a plunger cylinder 71 extending in the front-rear direction, a closing wall 72 closing the front-end opening of the plunger cylinder 71, and a protrusion 75 protruding rearward from the closing wall 72. The plunger cylinder 71 includes a large-diameter cylinder portion 71a and a small-diameter cylinder portion 71b connected to the front of the large-diameter cylinder portion 71a. The outer diameter of the small-diameter cylinder portion 71b is smaller than the outer diameter of the large-diameter cylinder portion 71a. The front-end portion of the small-diameter cylinder portion 71b is the front-end portion of the plunger cylinder 71. A gap is provided between the outer peripheral surface of the small-diameter cylinder portion 71b and the inner peripheral surface of the storage cylinder 60. The gap between the outer peripheral surface of the small-diameter cylinder portion 71b and the inner peripheral surface of the storage cylinder 60 communicates with a supply hole 61 formed in the storage cylinder 60.

[0048] On the outer peripheral surface of the plunger cylinder 71, a front lip portion 73a and a rear lip portion 73b are formed over the entire circumference in the circumferential direction of the plunger cylinder 71. In the present embodiment, the front lip portion 73a and the rear lip portion 73b are formed on the outer peripheral surface of the large-diameter cylinder portion 71a. The front lip portion 73a is formed on the outer peripheral surface at the front-end portion of the large-diameter cylinder portion 71a. The rear lip portion 73b is formed on the outer peripheral surface at the rear-end portion of the large-diameter cylinder portion 71a. The front lip portion 73a slides tightly in the front-rear direction on the inner peripheral surface of the front cylinder portion 63a of the cylinder barrel 63. Thereby, a sealing property is ensured between the front lip portion 73a and the inner peripheral surface of the front cylinder portion 63a.

[0049] The front lip portion 73a is formed in a cylindrical shape that opens forward. The front lip portion 73a is disposed with a gap outside the small-diameter cylindrical portion 71b in the radial direction centered on the axis O2. As a result, an annular concave groove 74 that is recessed rearward and surrounds the axis O2 is formed between the small-diameter cylindrical portion 71b and the front lip portion 73a. The concave groove 74 communicates with the supply hole 61 of the storage cylinder 60. The rear lip portion 73b slides tightly in the front-rear direction on the inner peripheral surface of the rear cylinder portion 63b of the cylinder tube 63. As a result, a sealing property is ensured between the rear lip portion 73b and the inner peripheral surface of the rear cylinder portion 63b.

[0050] The closing wall 72 closes the front end portion of the small-diameter cylindrical portion 71b. A protruding portion 72a that protrudes forward is formed at the center of the front end surface of the closing wall 72. The protruding portion 72a has a frustum shape arranged coaxially with the axis O2. The outer diameter of the protruding portion 72a becomes smaller from the rear to the front. The outer peripheral surface of the protruding portion 72a closes the communication hole 62a by contacting the rear end edge portion of the communication hole 62a. Thereby, the closing wall 72 closes the communication hole 62a in an openable manner. Note that the position of the storage plunger 70 when the closing wall 72 closes the communication hole 62a is the most advanced position. When the storage plunger 70 is arranged at the most advanced position, almost no liquid is stored in the storage cylinder 60.

[0051] The protruding portion 75 extends rearward from the rear surface of the closing wall 72. In the present embodiment, the protruding portion 75 has a cylindrical shape arranged coaxially with the axis O2. The protruding portion 75 penetrates the inside of the small-diameter cylindrical portion 71b in the front-rear direction. The rear end portion of the protruding portion 75 is located in front of the rear end portion of the large-diameter cylindrical portion 71a and is located inside the large-diameter cylindrical portion 71a. The rear end portion of the protruding portion 75 is in contact with the front end portion of an elastic bag body 90 described later. The outer peripheral edge portion of the rear end surface of the protruding portion 75 has a chamfered shape. The outer diameter of the protruding portion 75 becomes slightly smaller toward the rear.

[0052] In the biasing member 100, the guide member 80 and the elastic bag body 90 are separate from each other. The guide member 80 is cylindrical and extends in the front-rear direction. In the present embodiment, the guide member 80 is arranged coaxially with the axis O2 and is substantially cylindrical with an opening at the rear. The guide member 80 is accommodated inside the storage cylinder 60. More specifically, the guide member 80 is accommodated in the rear portion inside the storage cylinder 60. The guide member 80 is located behind the storage plunger 70. The guide member 80 has a cylindrical portion 81, a lid portion 82, and a flange portion 83.

[0053] The cylindrical portion 81 is cylindrical and arranged coaxially with the axis O2. The cylindrical portion 81 has a main body portion 81a and a fitting portion 81b. The front end of the main body portion 81a is the front end of the cylindrical portion 81. The front end of the main body portion 81a is inserted inside the plunger cylinder 71. The rear end of the main body portion 81a is located behind the storage plunger 70. The fitting portion 81b is connected to the rear end of the main body portion 81a. The rear end of the fitting portion 81b is the rear end of the cylindrical portion 81. The inner diameter of the fitting portion 81b is larger than the inner diameter of the main body portion 81a. The outer diameter of the fitting portion 81b is larger than the outer diameter of the main body portion 81a. The fitting portion 81b is externally fitted to the second fitting cylinder portion 42 via the elastic bag body 90.

[0054] The lid portion 82 is provided at the front end of the cylindrical portion 81. The lid portion 82 is annular and arranged coaxially with the axis O2. The outer peripheral edge portion of the lid portion 82 is connected to the front end of the cylindrical portion 81. The lid portion 82 is located inside the plunger cylinder 71. A through hole 82a penetrating the lid portion 82 in the front-rear direction is formed in the lid portion 82. The through hole 82a is a circular hole arranged coaxially with the axis O2. A protrusion 75 is inserted into the through hole 82a. The rear end of the protrusion 75 is passed through in the front-rear direction in the through hole 82a.

[0055] The flange portion 83 protrudes radially outward about the axis O2 from the rear end of the cylindrical portion 81. The flange portion 83 is an annular shape arranged coaxially with the axis O2. The flange portion 83 is located inside the rear end of the first fitting cylinder portion 41. The flange portion 83 is engaged from behind with an engaging projection 41a formed on the inner peripheral surface of the first fitting cylinder portion 41. The flange portion 83 is supported from behind by the bottom portion 43 of the support member 40 via a bag body flange portion 93 described later. In this embodiment, the guide member 80 is made of resin. The resin forming the guide member 80 is, for example, polypropylene (PP), high-density polyethylene (HDPE), etc. Note that the material constituting the guide member 80 may be a material other than resin.

[0056] The elastic bag body 90 is a bag-shaped member that can be elastically deformed. In this embodiment, the elastic bag body 90 is housed inside the guide member 80. The elastic bag body 90 is detachably adhered to the inner surface of the guide member 80. The elastic bag body 90 extends in the front-rear direction. The elastic bag body 90 is a bag shape that opens to the rear. The thickness of the elastic bag body 90 is thinner than the thickness of the guide member 80. A second fitting cylinder portion 42 is airtightly fitted inside the rear end of the elastic bag body 90. Thereby, the inside of the elastic bag body 90 is sealed. The inside of the elastic bag body 90 is filled with air. Note that the inside of the elastic bag body 90 may be filled with a gas other than air.

[0057] The elastic bag body 90 has a bag body cylindrical portion 91, a bag body lid portion 92, a bag body flange portion 93, and a bag body annular portion 94. The bag body cylindrical portion 91 is arranged coaxially with the axis O2 and is a cylindrical shape that opens rearward. The bag body cylindrical portion 91 is a cylindrical shape that closely adheres to the inner peripheral surface of the cylindrical portion 81 of the guide member 80. The shape of the bag body cylindrical portion 91 is the same as the shape of the cylindrical portion 81 of the guide member 80. The bag body cylindrical portion 91 has a main body portion 91a that closely adheres to the inner peripheral surface of the main body portion 81a of the guide member 80, and a blocked portion 91b that closely adheres to the inner peripheral surface of the fitting portion 81b of the guide member 80. The inner peripheral surface of the blocked portion 91b is closely adhered and fixed to the outer peripheral surface of the second fitting cylinder portion 42 over one circumference around the axis O2. Thereby, the rear end portion of the elastic bag body 90 is blocked, and the inside of the elastic bag body 90 is sealed. The outer diameter of the blocked portion 91b is larger than the outer diameter of the main body portion 91a. The inner diameter of the blocked portion 91b is larger than the inner diameter of the main body portion 91a.

[0058] The bag body lid portion 92 is provided at the front end portion of the bag body cylindrical portion 91, that is, the front end portion of the main body portion 91a. The bag body lid portion 92 is in close contact with the rear surface of the lid portion 82. The bag body lid portion 92 covers the through hole 82a formed in the lid portion 82 from the rear. The rear end portion of the protrusion portion 75 of the storage plunger 70 is in contact with the bag body lid portion 92. The portion of the bag body lid portion 92 that faces the through hole 82a in the front-rear direction is elastically deformed rearward by the rear end portion of the protrusion portion 75. Thereby, in the present embodiment, even when the storage plunger 70 is in the most forward position, the elastic bag body 90 is slightly elastically deformed by compression in the front-rear direction, and the storage plunger 70 is biased forward by the elastic bag body 90.

[0059] Since the elastic bag body 90 biases the storage plunger 70 forward, the closing wall 72 is pressed against the rear edge of the communication hole 62a from behind. Thereby, the closing wall 72 suitably seals the communication hole 62a. The storage plunger 70 opens the valve when it moves backward against the elastic bag body 90 as a whole and releases the communication hole 62a. Therefore, the storage plunger 70 can pressurize the liquid in the storage cylinder 60 until it moves backward, and when the pressure of the liquid reaches a predetermined value, that is, when the storage plunger 70 moves backward against the elastic bag body 90, it opens the valve and functions as a pressure accumulator valve that supplies the pressurized liquid to the ejection hole 133 side.

[0060] The bag body flange portion 93 protrudes radially outward about the axis O2 from the rear end portion of the bag body cylindrical portion 91, that is, from the rear end portion of the portion to be closed 91b. The bag body flange portion 93 is annular and arranged coaxially with the axis O2. The bag body flange portion 93 is in close contact with the rear surface of the flange portion 83 of the guide member 80. The bag body flange portion 93 is in contact with the front surface of the bottom portion 43 of the support member 40. Thereby, the elastic bag body 90 is supported from behind by the support member 40. The bag body annular portion 94 protrudes forward from the outer peripheral edge portion of the bag body flange portion 93. The bag body annular portion 94 is annular and arranged coaxially with the axis O2. The bag body annular portion 94 is in close contact with the outer peripheral surface of the flange portion 83 of the guide member 80. The bag body annular portion 94 is located between the outer peripheral surface of the flange portion 83 and the inner peripheral surface of the first fitting cylinder portion 41.

[0061] The longitudinal elastic modulus of the material forming the elastic bag body 90 is smaller than that of the material forming the guide member 80. The material forming the elastic bag body 90 is, for example, a resin such as polyethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), ethylene-vinyl alcohol copolymer (EVOH), or an elastomer such as rubber. The guide member 80 and the elastic bag body 90 are integrally formed, for example, by laminated injection molding.

[0062] Figure 3 shows a cross-sectional view of the biasing member 100 in a state before being assembled into the storage cylinder 60 after being molded by laminated injection molding. As shown in Figure 3, immediately after the biasing member 100 is molded, a closing portion 84 is formed on the lid portion 82, and the front end portion of the guide member 80 is closed. The closing portion 84 is substantially disc-shaped and is arranged coaxially with the axis O2. The outer peripheral edge portion of the closing portion 84 is connected to the inner peripheral edge portion of the lid portion 82 via a thin-walled weakening portion 84a. When a force is applied to the closing portion 84 and the weakening portion 84a is broken, the closing portion 84 is removed and a through-hole 82a is formed.

[0063] The storage valve 20 shown in Figure 2 is a valve that allows the supply of liquid from the inside of the vertical supply cylinder portion 10 into the storage cylinder 60 and restricts the outflow of liquid from the inside of the storage cylinder 60 into the vertical supply cylinder portion 10. The storage valve 20 is provided inside the inner cylinder 13 of the vertical supply cylinder portion 10. In the present embodiment, the storage valve 20 includes a fixing portion 21 fixed inside the upper end opening portion 13g of the inner cylinder 13, a valve body portion 22 seated on the first valve seat portion 13e from above, and an elastically deformable portion 23 connecting the fixing portion 21 and the valve body portion 22.

[0064] The fixing portion 21 has a disk portion 21a arranged coaxially with the axis O1, and a cylindrical portion 21b protruding upward from the outer peripheral edge portion of the disk portion 21a. The outer peripheral surface of the cylindrical portion 21b is liquid-tightly fitted to the inner peripheral surface of the upper end opening 13g. Thereby, the fixing portion 21 liquid-tightly closes the upper end opening 13g of the inner cylinder 13. The valve body portion 22 is arranged coaxially with the axis O1 and is substantially cylindrical extending in the vertical direction. The lower end portion of the valve body portion 22 is arranged to face upward of the ball valve 36. The upper end portion of the valve body portion 22 is a flange portion 22a that extends radially outward. The flange portion 22a is located above the first valve seat portion 13e. The flange portion 22a is seated on the first valve seat portion 13e in a separable manner. When the flange portion 22a seats on the first valve seat portion 13e, a part inside the inner cylinder 13 is blocked. Thereby, the storage valve 20 can regulate the outflow of the liquid from the storage cylinder 60 through the connection cylinder portion 30 into the vertical supply cylinder portion 10.

[0065] The elastic deformation portion 23 is a portion that can be elastically deformed in the vertical direction. The elastic deformation portion 23 has, for example, an annular outer shape that is substantially figure-eight shaped in a side view when viewed in the left-right direction. When the liquid flows from the vertical supply cylinder portion 10 into the storage cylinder 60, the elastic deformation portion 23 is elastically deformed in compression in the vertical direction by the valve body portion 22 being lifted upward by the liquid. Thereby, the flange portion 22a is separated upward from the first valve seat portion 13e, and the supply of the liquid from the vertical supply cylinder portion 10 into the storage cylinder 60 is allowed. Thus, the storage valve 20 allows the supply of the liquid from the vertical supply cylinder portion 10 into the storage cylinder 60 by elastically deforming in the vertical direction.

[0066] As shown in FIG. 1, the nozzle member 3 is attached to the ejector body 2. The nozzle member 3 has a mounting cylinder portion 131 extending in the front-rear direction, and a nozzle cylinder 132 provided in front of the mounting cylinder portion 131. The mounting cylinder portion 131 is externally fitted to the injection cylinder portion 11 in a liquid-tight manner. The nozzle cylinder 132 is formed with a discharge hole 133 that opens forward and discharges the liquid forward.

[0067] Next, the case of using the trigger-type liquid ejector 1 configured as described above will be explained. In the following description, it is assumed that the state of the trigger-type liquid ejector 1 is such that, by operating the trigger portion 51 a plurality of times, the inside of each part of the trigger-type liquid ejector 1 is filled with liquid and the liquid can be sucked up from the vertical supply cylinder portion 10.

[0068] In the state shown in FIG. 1, when the trigger portion 51 is pulled backward against the biasing force of the coil spring 54, the piston 52 moves backward from the most forward position as the trigger portion 51 moves backward, so that the inside of the cylinder 53 can be pressurized. As a result, the liquid in the cylinder 53 can be supplied into the inner cylinder 13 of the vertical supply cylinder portion 10 through the communication cylinder portion 53d. Then, the liquid supplied to the inner cylinder 13 pushes down the ball valve 36 to close it and pushes up the valve body portion 22 of the storage valve 20 to open the storage valve 20.

[0069] As a result, the liquid is supplied from the inside of the inner cylinder 13 into the storage cylinder 60 through the connection cylinder portion 30 and the supply hole 61, and the inside of the storage cylinder 60 is pressurized. As the inside of the storage cylinder 60 is pressurized, as shown in FIG. 4, the storage plunger 70 moves backward from the most forward position against the biasing force of the elastic bag body 90. At this time, the elastic bag body 90 is further pushed backward by the protrusion 75, so that the elastic bag body 90 is further elastically deformed in the compression direction in the front-rear direction. In this way, the elastic bag body 90 is elastically deformed in compression as the storage plunger 70 moves backward, and biases the storage plunger 70 forward.

[0070] When the storage plunger 70 moves backward, the protruding portion 72a of the closing wall 72 is separated from the communication hole 62a to open the valve, and the communication hole 62a can be opened. Therefore, the liquid with increased pressure can be guided to the ejection hole 133 through the communication hole 62a and the injection cylinder portion 11, and the liquid can be ejected forward from the ejection hole 133. Thus, every time an operation of pulling the trigger unit 51 backward is performed, the liquid can be ejected from the ejection hole 133, and the storage plunger 70 can be moved backward to store (fill) the liquid in the storage cylinder 60.

[0071] Thereafter, when the operation of pulling the trigger unit 51 is stopped and the trigger unit 51 is released, the piston 52 moves forward in the cylinder 53 by the biasing force of the coil spring 54, so the trigger unit 51 is biased forward and returns to its original position. Therefore, the pressure in the cylinder 53 can be reduced to a negative pressure lower than the pressure in the container body A, so that the liquid in the container body A can be sucked into the vertical supply cylinder portion 10. Then, the newly sucked liquid pushes up the ball valve 36 to open it and is introduced into the cylinder 53 through the communication cylinder portion 53d. Thereby, it can be prepared for the next ejection.

[0072] When the operation of the trigger unit 51 is stopped, although the supply of the liquid into the storage cylinder 60 through the vertical supply cylinder portion 10 and the connection cylinder portion 30 stops, the storage plunger 70 begins to move forward toward the most advanced position by the biasing force of the elastic bag body 90. At this time, the outflow of the liquid from the storage cylinder 60 into the vertical supply cylinder portion 10 is regulated by the storage valve 20.

[0073] Thereby, the liquid accumulated in the storage cylinder 60 can be guided to the ejection hole 133 through the communication hole 62a and the injection cylinder portion 11, and the liquid can be continuously ejected forward through the ejection hole 133. In this way, the liquid can be ejected not only when the operation of pulling the trigger unit 51 backward is performed, but also when the trigger unit 51 is not operated, and continuous ejection of the liquid can be performed.

[0074] Here, when the storage plunger 70 is in the fully retracted position and an operation of pulling the trigger part 51 backward is performed, it is conceivable that the liquid is excessively supplied into the storage cylinder 60, resulting in liquid leakage and damage to each part. However, in the present embodiment, as shown in FIG. 4, when the storage plunger 70 moves backward to a certain extent, the front lip part 73a reaches a position radially opposed to the communication groove 64, and the space in the storage cylinder 60 located in front of the storage plunger 70 communicates with the inside of the container body A through the communication groove 64, the recovery hole 69, and the recovery passage 17. That is, the recovery passage 17 communicates the inside of the storage cylinder 60 with the inside of the container body A when the storage plunger 70 moves backward. Therefore, a part of the liquid in the storage cylinder 60 is returned to the inside of the container body A, and it is possible to suppress the excessive supply of the liquid into the storage cylinder 60. Thereby, it is possible to suppress the pressure in the storage cylinder 60 from becoming excessively high, and it is possible to suppress the occurrence of liquid leakage and damage to each part.

[0075] According to this embodiment, the trigger-type liquid ejector 1 includes an ejector body 2 attached to a container body A containing a liquid, and a nozzle member 3 in which an ejection hole 133 for ejecting the liquid is formed. The ejector body 2 has a vertical supply cylinder portion 10 that sucks up the liquid in the container body A, and a trigger portion 51 that is arranged to be movable rearward in a forward-biased state. By the rearward movement of the trigger portion 51, a trigger mechanism 50 that causes the liquid to flow from inside the vertical supply cylinder portion 10 toward the ejection hole 133 side, a storage cylinder 60 into which the liquid that has passed through the vertical supply cylinder portion 10 is supplied, a storage plunger 70 that is arranged to be movable axially along the central axis of the storage cylinder 60, that is, the axis O2, in the storage cylinder 60, and that moves toward one side (rear side) in the axial direction as the liquid is supplied into the storage cylinder 60 and is biased toward the other side (front side) in the axial direction, and an elastic bag body 90 that is elastically deformable and has a sealed interior. The elastic bag body 90 is elastically deformed in compression as the storage plunger 70 moves toward the one side (rear side), and biases the storage plunger 70 toward the other side (front side). Therefore, when the elastic bag body 90 is elastically deformed in compression and the air inside the sealed elastic bag body 90 is compressed, a restoring force is generated in the elastic bag body 90, and a force in the direction of the other side can be applied to the storage plunger 70 via the elastic bag body 90. Thereby, the storage plunger 70 can be biased toward the other side without using a metal coil spring. Therefore, according to this embodiment, the amount of metal material used in the trigger-type liquid ejector 1 can be reduced. Also, the manufacturing cost of the elastic bag body 90 is likely to be lower than that of a metal coil spring. Therefore, by using the elastic bag body 90 instead of the metal coil spring, the manufacturing cost of the trigger-type liquid ejector 1 can be easily reduced. Also, the elastic bag body 90 is likely to be lighter than a metal coil spring. Therefore, by using the elastic bag body 90 instead of the metal coil spring, the trigger-type liquid ejector 1 can be easily lightened. Thereby, the energy required for transporting the trigger-type liquid ejector 1 can be easily reduced.

[0076] Further, according to the present embodiment, the ejector body 2 has a cylindrical guide member 80 extending in the axial direction along the axis O2. The elastic bag body 90 is accommodated inside the guide member 80. Therefore, the guide member 80 can easily limit the deformation manner when the elastic bag body 90 elastically deforms and the deformation manner when the elastic bag body 90 restores and deforms, and can suppress the elastic bag body 90 from deforming into an unintended shape. Thereby, the elastic bag body 90 can suitably apply the axial biasing force to the storage plunger 70.

[0077] Further, according to the present embodiment, the storage plunger 70 has a protrusion 75 protruding toward one side (rear side) in the axial direction along the axis O2. The elastic bag body 90 is pushed toward the one side by the protrusion 75 as the storage plunger 70 moves toward the one side. Therefore, pressure can be suitably applied to the elastic bag body 90 via the protrusion 75, and the elastic bag body 90 can be easily compressed and elastically deformed.

[0078] <Second Embodiment> In the present embodiment, the shape of the biasing member 200 is different from that in the first embodiment. For the configurations similar to those in the above-described embodiments in the present embodiment, the description may be omitted by appropriately assigning the same reference numerals. As shown in FIG. 5, in the support member 240 of the ejector body 202 of the trigger-type liquid ejector 201 of the present embodiment, the engaging protrusion 241a of the first fitting cylinder portion 241 is located further forward than the engaging protrusion 41a in the first embodiment. Other configurations of the support member 240 are the same as those of the support member 40 in the first embodiment.

[0079] The biasing member 200 includes a guide member 280 and an elastic bag body 290. In the present embodiment, the guide member 280 and the elastic bag body 290 are formed in a state of being detachably adhered to each other, for example, by biaxial stretch blow molding. Different from the guide member 80 of the first embodiment, the guide member 280 does not have a flange portion 83. The cylindrical portion 281 of the guide member 280 has a main body portion 281a and a fitting portion 281b. In the present embodiment, the main body portion 281a has a small-diameter portion 281c and a large-diameter portion 281d.

[0080] The front end of the small-diameter portion 281c is the front end of the main body portion 281a and the front end of the cylindrical portion 281. The front end of the small-diameter portion 281c is located inside the plunger cylinder 71. The large-diameter portion 281d is connected to the rear end of the small-diameter portion 281c. The rear end of the large-diameter portion 281d is the rear end of the main body portion 281a. The inner diameter of the large-diameter portion 281d is larger than the inner diameter of the small-diameter portion 281c. The outer diameter of the large-diameter portion 281d is larger than the outer diameter of the small-diameter portion 281c. The large-diameter portion 281d is fitted into the cylinder barrel 63. The outer peripheral surface of the large-diameter portion 281d is in contact with the inner peripheral surface of the rear cylinder portion 63b. Between the small-diameter portion 281c and the large-diameter portion 281d in the front-rear direction of the outer peripheral surface of the cylindrical portion 281, a stepped portion 281f having a forward-facing stepped surface 281g is formed. The stepped surface 281g is annular and arranged coaxially with the axis O2. The stepped surface 281g is located rearward as it goes outward in the radial direction centered on the axis O2. The stepped surface 281g is arranged opposite to the rear of the rear end of the storage plunger 70 with a gap therebetween.

[0081] The fitting portion 281b is connected to the rear end of the cylindrical portion 281. The inner diameter of the fitting portion 281b is larger than the inner diameter of the small-diameter portion 281c and smaller than the inner diameter of the large-diameter portion 281d. The outer diameter of the fitting portion 281b is larger than the outer diameter of the small-diameter portion 281c and smaller than the outer diameter of the large-diameter portion 281d. The fitting portion 281b is externally fitted to the second fitting cylinder portion 42 via the elastic bag body 290. An engaging protrusion 281e is formed on the outer peripheral surface of the fitting portion 281b. The engaging protrusion 281e is engaged with the engaging protrusion 241a formed on the inner peripheral surface of the first fitting cylinder portion 241 from the rear.

[0082] The lid portion 282 of the guide member 280 has an annular portion 282b and a separating portion 284. The annular portion 282b is an annular shape arranged coaxially with the axis O2. A weakening portion 284a is formed on the inner peripheral edge portion of the annular portion 282b. The weakening portion 284a is formed, for example, by forming a notch by machining after the guide member 280 is formed by biaxial stretch blow molding.

[0083] The separating portion 284 is located inside the annular portion 282b in the radial direction centered on the axis O2. The separating portion 284 is a substantially disc shape arranged coaxially with the axis O2. The front surface of the separating portion 284 is a spherical surface that is recessed rearward. The rear end portion of the protrusion portion 75 is in contact with the front surface of the separating portion 284. The rear surface of the separating portion 284 is a spherical surface that protrudes rearward. In a state before the biasing member 200 is assembled into the storage cylinder 60, the separating portion 284 is connected to the annular portion 282b via the weakening portion 284a. When the biasing member 200 is assembled into the storage cylinder 60, the separating portion 284 is pushed rearward by the protrusion portion 75, the weakening portion 284a is broken, and the separating portion 284 is separated from the annular portion 282b. At this time, the elastic bag body 290 is pushed through the separating portion 284, so that the elastic bag body 290 is elastically deformed in compression in the front-rear direction. Thereby, the storage plunger 70 is biased forward by the elastic bag body 290.

[0084] The separating part 284 is made of a material that easily adheres to the lid part 292 of the elastic bag body 290 and is pressed against the elastic bag body 290 by the protruding part 75, so that it is suppressed from coming off between the protruding part 75 and the elastic bag body 290. When the separating part 284 separates from the annular part 282b, a through-hole 282a through which the protruding part 75 passes is formed in the lid part 282. Note that the weakened part 284a may be broken when the operation of the trigger part 51 is first performed and the storage plunger 70 moves backward.

[0085] The elastic bag body 290 has a bag body cylindrical part 291, a bag body lid part 292, and a bag body flange part 293. Different from the elastic bag body 90 of the first embodiment, the elastic bag body 290 does not have a bag body annular part 94. The bag body cylindrical part 291 is cylindrical and adheres to the inner peripheral surface of the cylindrical part 281 of the guide member 280. The shape of the bag body cylindrical part 291 is substantially the same as the shape of the cylindrical part 281 of the guide member 280. The bag body cylindrical part 291 has a main body part 291a that adheres to the inner peripheral surface of the main body part 281a of the guide member 280 and a closed part 291b that adheres to the inner peripheral surface of the fitting part 281b of the guide member 280.

[0086] The main body part 291a has a small diameter part 291c that adheres to the inner peripheral surface of the small diameter part 281c of the guide member 280 and a large diameter part 291d that adheres to the inner peripheral surface of the large diameter part 281d of the guide member 280. The large diameter part 291d is connected to the rear end of the small diameter part 291c. The inner diameter of the large diameter part 291d is larger than the inner diameter of the small diameter part 291c. The outer diameter of the large diameter part 291d is larger than the outer diameter of the small diameter part 291c. A stepped part 291f having a front-facing stepped surface 291g is formed between the small diameter part 291c and the large diameter part 291d in the front-rear direction on the outer peripheral surface of the bag body cylindrical part 291. The stepped surface 291g is annular and arranged coaxially with the axis O2. The stepped surface 291g is located rearward as it goes outward in the radial direction centered on the axis O2. The stepped surface 291g adheres to the inner surface of the part of the guide member 280 where the stepped part 281f is formed. The inner peripheral surface of the closed portion 291b is fixed in close contact with the outer peripheral surface of the second fitting cylinder portion 42 over one full rotation around the axis O2. As a result, the rear end portion of the elastic bag body 290 is closed, and the inside of the elastic bag body 290 is sealed. The thickness of the closed portion 291b is larger than the thickness of the main body portion 291a.

[0087] The bag body lid portion 292 is provided at the front end portion of the bag body cylinder portion 291, that is, the front end portion of the main body portion 291a. The rear surface of the separation portion 284 is in contact with the front surface of the bag body lid portion 292. The front surface of the bag body lid portion 292 is the portion that is pushed rearward by the protrusion portion 75 in the elastic bag body 290. In the present embodiment, the front surface of the bag body lid portion 292 is pushed rearward by the protrusion portion 75 via the separation portion 284. A recessed portion 292a that is recessed rearward is formed on the front surface of the bag body lid portion 292. The separation portion 284 is in contact with the recessed portion 292a. The surface of the recessed portion 292a that faces the front side is a spherical surface that is recessed rearward.

[0088] The bag body flange portion 293 protrudes radially outward about the axis O2 from the rear end portion of the bag body cylinder portion 291, that is, the rear end portion of the closed portion 291b. The bag body flange portion 293 is an annular shape arranged coaxially with the axis O2. The bag body flange portion 293 is in contact with the rear end surface of the fitting portion 281b in the guide member 280. The other configurations of the guide member 280 are the same as the other configurations of the guide member 80 in the first embodiment. The other configurations of the elastic bag body 290 are the same as the other configurations of the elastic bag body 90 in the first embodiment. The other configurations of the trigger-type liquid ejector 201 are the same as the other configurations of the trigger-type liquid ejector 1 in the first embodiment.

[0089] According to this embodiment, in a portion of the elastic bag body 290 that is pushed by the protrusion 75 toward one axial side (rear side) along the axis O2, a concave portion 292a that is recessed toward the one side is formed. Therefore, compared with the case where the concave portion 292a is not formed, the relative position of the elastic bag body 290 with respect to the protrusion 75 of the elastic bag body 290 is suppressed from shifting. Thereby, the protrusion 75 can more suitably push the elastic bag body 290 in the front-rear direction, and the elastic bag body 290 can be suitably compressed and elastically deformed.

[0090] <Third Embodiment> This embodiment is different from the first embodiment in that the guide member 80 is not provided. Note that, for the same configurations as those in the above-described embodiments in this embodiment, the description may be omitted by appropriately assigning the same reference numerals. As shown in FIG. 6, the storage plunger 370 in the ejector body 302 of the trigger-type liquid ejector 301 according to this embodiment does not have a protrusion 75, unlike the storage plunger 70 in the first embodiment. Other configurations of the storage plunger 370 are the same as those of the storage plunger 70 in the first embodiment.

[0091] The first fitting cylinder portion 341 of the support member 340 does not have an engagement protrusion 41a. The support member 340 has a protruding cylinder portion 344 that protrudes forward from the bottom portion 43. The protruding cylinder portion 344 is arranged coaxially with the axis O2 and is cylindrical with an opening at the front. The front end portion of the protruding cylinder portion 344 is located behind the front end portion of the second fitting cylinder portion 42. The protruding cylinder portion 344 is located between the first fitting cylinder portion 341 and the second fitting cylinder portion 42. An engagement protrusion 345 is formed on the inner peripheral surface at the front end portion of the protruding cylinder portion 344. Other configurations of the support member 340 are the same as those of the support member 40 in the first embodiment.

[0092] In this embodiment, the biasing member 300 does not have the guide member 80. The biasing member 300 is composed only of the elastic bag body 390. The elastic bag body 390 has a bag body cylindrical portion 391, a bag body lid portion 392, and a bag body flange portion 393. Different from the elastic bag body 90 of the first embodiment, the elastic bag body 390 does not have the bag body annular portion 94. The bag body cylindrical portion 391 has a bellows portion 395 that extends in the front-rear direction. The bellows portion 395 is the portion of the bag body cylindrical portion 391 that has a bellows shape. In this specification, the "bellows shape" means that in a cross-section along the direction in which the portion provided with the bellows shape extends, the shape of the portion is such that the unevenness is alternately provided in the extending direction. In this embodiment, the bellows portion 395 has a shape in which the annular convex portions 395a and the annular concave portions 395b are alternately arranged in the front-rear direction. The annular convex portion 395a protrudes outward in the radial direction around the axis O2 and is an annular portion surrounding the axis O2. The annular concave portion 395b is recessed inward in the radial direction around the axis O2 and is an annular portion surrounding the axis O2.

[0093] The portion to be blocked 391b is located behind the bellows portion 395. The outer diameter of the portion to be blocked 391b is smaller than the outer diameter of the bellows portion 395. The inner diameter of the portion to be blocked 391b is smaller than the inner diameter of the bellows portion 395. The portion to be blocked 391b is airtightly externally fitted to the second fitting cylinder portion 42. The portion to be blocked 391b is inserted inside the protruding cylinder portion 344. The rear end of the portion to be blocked 391b is supported from behind by the bottom portion 43 of the support member 340. The bag body flange portion 393 is engaged from behind with the engagement protrusion 345 formed on the inner peripheral surface of the protruding cylinder portion 344.

[0094] In the lid portion 392 of the elastic bag body 390, a recessed portion 392a that is recessed rearward is formed. In the present embodiment, the outer diameter of the lid portion 392 of the bag body is larger than the inner diameter at the rear end portion of the plunger cylinder 71. The outer peripheral edge portion of the lid portion 392 of the bag body contacts the inner peripheral edge portion at the rear end portion of the plunger cylinder 71 from the rear. In the present embodiment, the elastic bag body 390 is pushed rearward by the rear end portion of the plunger cylinder 71, and the elastic bag body 390 undergoes compression elastic deformation. In FIG. 6, a state in which the elastic bag body 390 is not elastically deformed before being assembled into the storage cylinder 60 is shown by a two-dot chain line. Other configurations of the elastic bag body 390 are the same as those of the elastic bag body 90 in the first embodiment. Other configurations of the trigger-type liquid ejector 301 are the same as those of the trigger-type liquid ejector 1 in the first embodiment.

[0095] According to the present embodiment, the elastic bag body 390 has a bellows portion 395 that extends in the axial direction (front-rear direction) along the axis O2. Therefore, the elastic bag body 390 can be easily elastically deformed in the axial direction at the bellows portion 395. As a result, when being pushed rearward by the storage plunger 370, the elastic bag body 390 can be easily compressed and elastically deformed. Further, when the bellows portion 395 is elastically deformed in the front-rear direction, it is possible to suppress the elastic bag body 390 from being elastically deformed into an unintended shape. Therefore, even without providing the guide members 80 and 280 described above, the elastic bag body 390 can suitably apply the biasing force in the axial direction to the storage plunger 370.

[0096] Also, according to the present embodiment, the rear end portion of the plunger cylinder 71 contacts the outer peripheral edge portion of the lid portion 392 of the bag body. Therefore, the rear end portion of the plunger cylinder 71 can push the outer peripheral edge portion of the lid portion 392 rearward over one circumference around the axis O2. As a result, the storage plunger 370 can push the elastic bag body 390 rearward more stably, and the elastic bag body 390 can be more suitably and easily compressed and elastically deformed.

[0097] <Fourth Embodiment> This embodiment is different from the third embodiment in that the elastic bag body 490 is not sealed by a separate member. For components in this embodiment that are the same as those in the above-described embodiments, the description may be omitted by appropriately assigning the same reference numerals etc. As shown in FIG. 7, the support member 440 in the ejector body 402 of the trigger-type liquid ejector 401 of this embodiment does not have the second fitting cylinder portion 42. The bottom portion 443 of the support member 440 is substantially disc-shaped and arranged coaxially with the axis O2. The bottom portion 443 covers the elastic bag body 490 from behind. Other configurations of the support member 440 are the same as those of the support member 40 in the first embodiment.

[0098] In this embodiment, the biasing member 400 does not have the guide member 80. The biasing member 400 consists only of the elastic bag body 490. The elastic bag body 490 is a bag body whose interior is sealed without relying on other members. The elastic bag body 490 has a bag body cylinder portion 491, a bag body lid portion 492, and a bag body bottom portion 496. The bag body cylinder portion 491 has a bellows portion 495 that extends in the front-rear direction. The bellows portion 495 is the same as the bellows portion 395 in the third embodiment. The bag body cylinder portion 491 has a reduced-diameter portion 491e that is connected to the front-side end of the bellows portion 495. The outer diameter and inner diameter of the reduced-diameter portion 491e become smaller as it goes forward. The outer peripheral surface of the reduced-diameter portion 491e is in contact with the rear-side end of the plunger cylinder 71 in the storage plunger 370 from behind. The elastic bag body 490 undergoes compressive elastic deformation in the front-rear direction when the reduced-diameter portion 491e is pushed backward by the storage plunger 370. The portion of the bag body cylinder portion 491 located in front of the reduced-diameter portion 491e is inserted into the plunger cylinder 71.

[0099] The bag body lid portion 492 closes the front-side end of the elastic bag body 490. The bag body bottom portion 496 closes the rear-side end of the elastic bag body 490. A recess 496a that is recessed forward is formed on the rear-side surface of the bag body bottom portion 496. The portion of the rear-side surface of the bag body bottom portion 496 outside the recess 496a is in contact with the bottom portion 443 of the support member 440 from the front. Thereby, the elastic bag body 490 is supported from behind by the support member 440.

[0100] The elastic bag body 490 is made, for example, by closing the opening of a molded body formed by extrusion blow molding by heat sealing. The bag body lid portion 492 is formed by the heat sealing. In FIG. 7, a state in which the elastic bag body 490 is not elastically deformed before being assembled into the storage cylinder 60 is shown by a two-dot chain line. Other configurations of the elastic bag body 490 are the same as those of the elastic bag body 390 in the third embodiment. Other configurations of the trigger-type liquid ejector 401 are the same as those of the trigger-type liquid ejector 301 in the third embodiment.

[0101] According to the present embodiment, the inside of the elastic bag body 490 is sealed without relying on other members. Therefore, it is not necessary to provide a portion for sealing the inside of the elastic bag body 490 in the ejector main body 402. Thereby, it is possible to suppress the complication of the structure of the ejector main body 402. Therefore, the manufacturing cost of the ejector main body 402 can be reduced, and the manufacturing cost of the trigger-type liquid ejector 401 can be reduced.

[0102] <Fifth Embodiment> In this embodiment, the shape of the bellows 595 is different from that in the third embodiment. For configurations that are the same as those in the above-described embodiments in this embodiment, the description may be omitted by appropriately assigning the same reference numerals. As shown in FIG. 8, the second fitting cylinder portion 542 of the support member 540 in the ejector main body 502 of the trigger-type liquid ejector 501 of this embodiment has a two-stage cylinder shape with a reduced diameter from the rear to the front. The outer diameter of the rear portion of the second fitting cylinder portion 542 is larger than the outer diameter of the front portion of the second fitting cylinder portion 542. Other configurations of the support member 540 are the same as those of the support member 40 in the first embodiment.

[0103] In this embodiment, the biasing member 500 does not have the guide member 80. The biasing member 500 consists only of the elastic bag body 590. The elastic bag body 590 has a bag body cylindrical portion 591, a bag body lid portion 592, and a bag body flange portion 593. Different from the elastic bag body 90 of the first embodiment, the elastic bag body 590 does not have the bag body annular portion 94. The bag body cylindrical portion 591 has a bellows portion 595 and a blocked portion 591b. In this embodiment, each of the concavo-convex shapes formed on the outer peripheral surface of the bellows portion 595 has a shape extending spirally. The blocked portion 591b is connected to the rear end portion of the bellows portion 595. The outer diameter of the blocked portion 591b is larger than the outer diameter of the bellows portion 595. The inner diameter of the blocked portion 591b is larger than the inner diameter of the bellows portion 595. The blocked portion 591b is airtightly externally fitted to the rear portion of the second fitting cylinder portion 542. Thereby, the inside of the elastic bag body 590 is sealed.

[0104] The bag body lid portion 592 closes the front end portion of the bag body cylindrical portion 591. The bag body lid portion 592 has a substantially disc shape arranged coaxially with the axis O2. A recess 592a that is recessed rearward is formed on the front surface of the bag body lid portion 592. The rear end portion of the protrusion 75 is in contact with the recess 592a. The bag body flange portion 593 is formed on the outer peripheral surface at the rear end portion of the blocked portion 591b. The bag body flange portion 593 is engaged from the rear with an engaging protrusion 41a formed on the inner peripheral surface of the first fitting cylinder portion 41. In FIG. 8, a state in which the elastic bag body 590 is not elastically deformed before being assembled into the storage cylinder 60 is shown by a two-dot chain line. In this embodiment, the elastic bag body 590 is made, for example, by injection molding. Other configurations of the elastic bag body 590 are the same as those of the elastic bag body 390 in the third embodiment. Other configurations of the trigger-type liquid ejector 501 are the same as those of the trigger-type liquid ejector 301 in the third embodiment.

[0105] According to the present embodiment, each of the uneven shapes formed on the outer peripheral surface of the bellows 595 extends spirally. Therefore, when the elastic bag body 590 is formed by injection molding, the resin can be easily flowed into the portion of the mold that forms the uneven shape extending spirally. As a result, the elastic bag body 590 can be easily manufactured.

[0106] Note that the present invention is not limited to the above-described embodiment, and the following configurations can also be adopted. The shape of the elastic bag body is not particularly limited. The elastic bag body may have any configuration as long as it is a bag-shaped member that can be elastically deformed in compression and can bias the storage plunger. The central axis of the storage cylinder may be inclined with respect to the front-rear direction. As described above, the respective configurations described in this specification can be combined with each other within a range where they do not conflict with each other.

[0107] Aspects of the present invention are as follows, for example. <1> An ejector body attached to a container body containing a liquid, A nozzle member having a jet hole for jetting the liquid, Comprising, The ejector body, A vertical supply cylinder for sucking up the liquid in the container body, Having a trigger portion arranged to be movable rearward in a forwardly biased state, and a trigger mechanism for circulating the liquid from the inside of the vertical supply cylinder toward the jet hole side by the rearward movement of the trigger portion, A storage cylinder into which the liquid passing through the vertical supply cylinder is supplied by the rearward movement of the trigger portion, A storage plunger arranged to be movable axially along the central axis of the storage cylinder in the storage cylinder, moving toward one side in the axial direction as the liquid is supplied into the storage cylinder, and biased toward the other side in the axial direction, An elastic bag body that can be elastically deformed and has a sealed interior, Having, The elastic bag body is a trigger-type liquid ejector that undergoes compressive elastic deformation as the storage plunger moves toward the one side, and biases the storage plunger toward the other side. <2> The ejector body has a cylindrical guide member extending in the axial direction. The elastic bag body is housed inside the guide member, and is the trigger-type liquid ejector according to <1>. <3> The elastic bag body has a bellows extending in the axial direction, and is the trigger-type liquid ejector according to <1> or <2>. <4> The storage plunger has a protrusion protruding toward the one side. As the storage plunger moves toward the one side, the elastic bag body is pushed toward the one side by the protrusion, and is the trigger-type liquid ejector according to any one of <1> to <3>. <5> In the portion of the elastic bag body that is pushed toward the one side by the protrusion, a recess that is recessed toward the one side is formed, and is the trigger-type liquid ejector according to <4>.

Description of Reference Numerals

[0108] 1,201,301,401,501... Trigger-type liquid ejector; 2,202,302,402,502... Ejector body; 3... Nozzle member; 10... Vertical supply cylinder portion; 50... Trigger mechanism; 51... Trigger portion; 53... Cylinder; 60... Storage cylinder; 70,370... Storage plunger; 75... Protrusion; 80,280... Guide member; 90,290,390,490,590... Elastic bag body; 133... Ejection hole; 292a,392a,592a... Recess; 395,495,595... Bellows; A... Container body; O2... Axis (central axis)

Claims

1. An ejector body attached to a container body containing a liquid, A nozzle member formed with an ejection hole for ejecting the liquid, Comprising, The ejector body, A vertical supply cylinder portion for sucking up the liquid in the container body, It has a trigger portion arranged to be movable rearward in a forwardly biased state, and by the rearward movement of the trigger portion, a trigger mechanism for circulating the liquid from inside the vertical supply cylinder portion toward the ejection hole side, A storage cylinder into which the liquid that has passed through the vertical supply cylinder portion is supplied by the rearward movement of the trigger portion, A storage plunger arranged to be movable axially along the central axis of the storage cylinder in the storage cylinder, moving toward one side in the axial direction as the liquid is supplied into the storage cylinder, and biased toward the other side in the axial direction, An elastic bag body that can be elastically deformed and has a sealed interior, Having, The elastic bag body is elastically deformed in compression as the storage plunger moves toward the one side, and biases the storage plunger toward the other side, a trigger-type liquid ejector.

2. The ejector body has a cylindrical guide member extending in the axial direction, The elastic bag body is housed inside the guide member, the trigger-type liquid ejector according to claim 1.

3. The elastic bag body has a bellows portion extending in the axial direction, the trigger-type liquid ejector according to claim 1.

4. The storage plunger has a protrusion protruding toward the one side, The elastic bag body is pushed toward the one side by the protrusion as the storage plunger moves toward the one side, the trigger-type liquid ejector according to any one of claims 1 to 3.

5. In the portion of the elastic bag body that is pushed toward the one side by the protrusion, a recess that is recessed toward the one side is formed, the trigger-type liquid ejector according to claim 4.

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