Trigger type liquid jetting device

Abstract

To provide a trigger type liquid jetting device in which appropriate operation performance of a piston is secured.SOLUTION: A trigger type liquid jetting device includes: a jetting device body 10 attached to a container body A storing liquid; and a nozzle part 20 formed with a jetting hole 21. The jetting device body includes a trigger mechanism 80 that causes liquid to circulate from the inside of a vertical supply cylinder part 60 to the jetting hole side by movement of a trigger part 81 to rearward. The trigger mechanism includes a piston 83 that pressurizes the inside of a cylinder 82 along the movement of the trigger part to rearward. The piston includes a connection part 111 extending from a piston body 110 to forward. The trigger part includes: a contact part 130 that contacts a front end surface 111a of the connection part from forward; and a second lock part 140 that is locked to a first lock part 113 of the connection part from rearward. The second lock part is locked to the first lock part 113 from rearward in a state of having a gap with the piston body in a front and back direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Trigger-type liquid ejectors are known that suck up liquid from a container by operating a trigger portion and eject the liquid through an ejection hole. One known example of this type of trigger-type liquid ejector is shown in Patent Document 1 below, which has a ejector body that is attached to a container body that contains liquid, and a nozzle portion that has an ejection hole that ejects the liquid forward.

[0003] The ejector body includes a vertical supply tube section that sucks up the liquid in the container body, an ejection tube section that extends forward from the vertical supply tube section, and a trigger mechanism that introduces the liquid from the vertical supply tube section into the ejection tube section and ejects it from the ejection tube section toward the ejection hole side by moving the forward-biased trigger section rearward. The trigger mechanism includes a cylinder disposed behind the trigger portion, and a piston that pressurizes the inside of the cylinder as the trigger portion moves rearward, thereby supplying liquid inside the cylinder into the vertical supply tube portion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2023-34982 A Summary of the Invention [Problem to be solved by the invention]

[0005] In a conventional trigger-type liquid ejector, a boss portion (convex portion) formed on the trigger portion is engaged with the piston, thereby combining the trigger portion and the piston with each other. However, when an operation such as quickly moving the trigger part backward is performed, the piston may not be able to keep up with the trigger part due to the pressure relationship in the cylinder. In this case, the boss part is subjected to stress that moves backward along with the trigger part, and stress that suppresses the backward movement of the boss part by the piston trying to stay in place. As a result, there is a risk that the boss part will be deformed forward due to the influence of the opposing stresses. In particular, when the pressing pressure of the piston is set relatively strong, the boss part is likely to be deformed.

[0006] If the boss is deformed, for example, when the trigger is moved backward, the piston cannot be pushed to a specified position, and the cylinder cannot be pressurized properly. In addition, the stroke of the piston may change, which may affect the ejection performance. Furthermore, the piston may move forward beyond the forwardmost position, which may cause the seal between the piston and the cylinder to become insufficient, resulting in liquid leakage.

[0007] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a trigger-type liquid ejector in which appropriate operability of the piston is ensured. [Means for solving the problem]

[0008] (1) A trigger type liquid ejector according to the present invention comprises an ejector body attached to a container body containing liquid, and a nozzle portion attached to the ejector body and having an ejection hole formed therein for ejecting liquid, the ejector body comprising a vertical supply tube portion that draws up the liquid in the container body, and a trigger portion arranged to be movable rearward while being biased forward by an elastic member, the trigger portion being configured to cause liquid to flow from within the vertical supply tube portion toward the ejection hole side by the rearward movement of the trigger portion, the trigger mechanism pressurizing an interior of the cylinder as the trigger portion moves rearward to supply the liquid in the cylinder into the vertical supply tube portion, and depressurizing an interior of the cylinder as the trigger portion moves back toward the front to draw up the liquid in the container body into the vertical supply tube portion, and a piston to be introduced into the cylinder, the piston comprising a piston body that is in sliding contact with the inner surface of the cylinder so as to be movable back and forth, and a connecting portion extending forward from the piston body, the connecting portion comprising a first locking portion provided between a front end surface of the connecting portion and a connecting portion between the connecting portion and the piston body, the trigger portion comprising an abutment portion that abuts against the front end surface of the connecting portion from the front, and a second locking portion that is locked to the first locking portion from the rear, the abutment portion and the second locking portion position the piston at the forward most position when the trigger portion is in the forward most swing position, and the second locking portion locks to the first locking portion from the rear with a gap left between the piston body in the forward and backward directions.

[0009] According to the trigger-type liquid ejector of the present invention, by operating the trigger against the biasing force of the elastic member and moving it backward from the forwardmost swing position, the inside of the cylinder can be pressurized using the piston, and the liquid in the cylinder can be supplied into the vertical supply tube portion. This allows the liquid to flow from the vertical supply tube portion toward the ejection hole side, and the liquid can be ejected from the ejection hole to the outside. Furthermore, when the operation of the trigger part is released after the liquid has been ejected, the trigger part is urged forward by the urging force (elastic restoring force) of the elastic member, and the trigger part can be moved back to its original position. This allows the pressure inside the cylinder to be reduced using the piston, so that the liquid inside the container can be sucked up into the vertical supply tube part and introduced into the cylinder. This makes it possible to prepare for the next ejection.

[0010] In particular, the trigger part has an abutment part that abuts against the front end face of the connecting part of the piston from the front, so that when the trigger part is operated backward, the stress (operating force) acting on the trigger part can be directly transmitted to the connecting part via the abutment part. This allows the piston to be pushed into the cylinder in conjunction with the operation of the trigger part, and the inside of the cylinder can be pressurized. On the other hand, when the trigger part moves forward to return to its original position, the second locking part of the trigger part locks to the first locking part of the connecting part from the rear, so that the forward biasing force acting on the trigger part can be directly transmitted to the connecting part via the first locking part and the second locking part. This allows the piston to move forward as the trigger part moves to return to its original position, thereby reducing the pressure inside the cylinder.

[0011] In this way, when the piston is moved backward to pressurize the inside of the cylinder, the abutment portion can be used, and when the piston is moved forward to depressurize the inside of the cylinder, the first locking portion and the second locking portion that lock with each other can be used. Moreover, the second locking portion of the trigger portion is locked to the first locking portion from the rear with a gap between it and the piston body in the front-rear direction. Therefore, for example, when the trigger portion is suddenly operated backward, even if the piston cannot keep up with the trigger portion due to the pressure inside the cylinder, the gap can prevent the second locking portion from contacting the piston body from the front. Therefore, it is possible to prevent the second locking portion from deforming and thereby displacing the piston. Therefore, it is possible to ensure proper operability of the piston. This makes it possible to operate the piston with an appropriate stroke amount, and to maintain the sealing between the piston and the cylinder to suppress liquid leakage, etc. Therefore, it is possible to provide a trigger-type liquid ejector with improved operability and quality.

[0012] (2) The first locking portion may include a pair of locking recesses recessed in the left-right direction from the outer peripheral surface of the connecting portion, and the second locking portion may include a pair of locking protrusions protruding in the left-right direction from the trigger portion and locking into the locking recesses from behind when inserted into the pair of locking recesses, respectively.

[0013] In this case, the trigger part and the piston can be combined integrally with a simple structure in which a pair of boss-shaped locking protrusions formed on the trigger part are simply locked into a pair of locking recesses formed on the connecting part of the piston, thus making it possible to provide a trigger-type liquid ejector with a simplified structure and improved ease of assembly.

[0014] (3) The abutment portion may include a pair of opposing walls extending rearward from the front plate portion of the trigger portion and arranged facing each other with a gap in between in the left-right direction, and an abutment wall that connects the rear end edges of the pair of opposing walls in the left-right direction so that the rear end surface makes surface contact or line contact with the front end surface of the connecting portion.

[0015] In this case, the rear end surface of the abutment wall connecting the rear end edges of the pair of opposing walls can be brought into surface or line contact with the front end surface of the connecting portion of the piston, so that the rear end surface of the abutment wall and the front end surface of the connecting portion can be brought into contact with a sufficient contact area. Therefore, stress can be efficiently transmitted to the piston via the abutment portion, and the piston can be smoothly pushed into the cylinder in conjunction with the operation of the trigger portion. Therefore, operability can be further improved. Effect of the Invention

[0016] According to the present invention, it is possible to ensure appropriate operability of the piston, and to provide a trigger-type liquid ejector with improved operability and quality. [Brief description of the drawings]

[0017] [Figure 1] 1 is a vertical cross-sectional view showing an embodiment of a trigger type liquid ejector according to the present invention. [Diagram 2] 2 is a cross-sectional view of the trigger portion and the piston taken along the line AA shown in FIG. 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a trigger type liquid ejector according to the present invention will be described with reference to the drawings. In this embodiment, a ejection container having a trigger type liquid ejector attached to a container body will be described as an example.

[0019] As shown in Figure 1, the trigger-type liquid ejector 1 of this embodiment comprises an ejector body 10 that is attached to a container body A that contains liquid, a nozzle portion 20 that is attached to the ejector body 10 and has an ejection hole 21 for ejecting the liquid, and an outer cover 30 that covers the ejector body 10 and the nozzle portion 20. Unless otherwise specified, each component part of the trigger type liquid ejector 1 is a molded product made of synthetic resin.

[0020] (Ejector body) The ejector body 10 mainly includes a vertical supply tube portion 60 , an ejection tube portion 66 , a relay member 70 , a trigger mechanism 80 , a ball valve 90 , and a storage valve 100 .

[0021] In this embodiment, the central axis of the vertical supply tube portion 60 is the axis O1, the side of the container body A along this axis O1 is called the lower side, and the opposite side is called the upper side, and the direction along the axis O1 is called the up-down direction. In addition, in a plan view seen from the up-down direction, one direction intersecting the axis O1 is called the front-rear direction L1, and a direction perpendicular to both the up-down direction and the front-rear direction L1 is called the left-right direction L2. Furthermore, within the front-rear direction L1, the direction in which the ejection hole 21 ejects liquid is called the forward direction. Therefore, the trigger-type liquid ejector 1 of this embodiment ejects liquid forward.

[0022] (Vertical supply tube) 1, the vertical supply tube portion 60 extends in the vertical direction and has a function of sucking up liquid in the container body A. The vertical supply tube portion 60 is attached to the container body A by an attachment cap 65. The vertical supply tube portion 60 includes an outer tube 61 having a top and an inner tube 62 fitted into the outer tube 61. The axis O1 of the vertical supply tube portion 60 is disposed at a position closer to the rear side than the container axis that passes through the center of the mouth of the container body A in the vertical direction.

[0023] The vertical supply tube portion 60 has an internal flow path R through which liquid flows toward the ejection hole 21 of the nozzle portion 20 through the ejection tube portion 66 by the rearward movement of a trigger portion 81 described later. The internal flow path R is an internal space located inside the inner tube 62. An upper portion of a pipe 67 that extends in the vertical direction and sucks up the liquid from the container body A is fitted into the inner tube 62.

[0024] (Injection cylinder part) An injection tube portion 66 is provided at the upper end of the vertical supply tube portion 60. The injection tube portion 66 is formed so as to extend forward with the axis O2 as the center. The injection tube portion 66 is formed in a cylindrical shape having an injection opening portion 66a that opens to the front of the ejector body 10, and communicates with a portion of the internal flow path R of the vertical supply tube portion 60 that is located above a ball valve 90, which will be described later. This allows the injection tube portion 66 to guide the liquid in the internal flow path R to the ejection hole 21.

[0025] A cylinder tube portion 68 is provided below the injection tube portion 66 and above the mounting cap 65. The cylinder tube portion 68 protrudes forward from the vertical supply tube portion 60 and is open forward.

[0026] (Relay parts) A relay member 70 that connects between injection tube portion 66 and nozzle portion 20 is attached to the front end portion of injection tube portion 66 . The relay member 70 is attached to the injection tube portion 66 from the front. The relay member 70 includes a partition wall portion 71 located forward of the injection opening 66a of the injection tube portion 66 and disposed opposite the injection opening 66a, a first relay tube portion 72 extending rearward from the partition wall portion 71 and fitted onto the injection tube portion 66, a second relay tube portion 73 extending forward from the partition wall portion 71, and a guide shaft 74 located inside the second relay tube portion 73 and extending forward from the partition wall portion 71.

[0027] The second relay tube portion 73 and the guide shaft 74 are disposed about an axis O3 that is eccentric downward with respect to the axis O2 of the injection tube portion 66. A communication hole 75 that communicates with the injection opening 66a of the injection tube portion 66 is formed in a portion of the partition portion 71 that is located above the guide shaft 74 and inside the second relay tube portion 73. As a result, the interior of the second relay tube portion 73 communicates with the interior of the injection tube portion 66 through the communication hole 75 and the injection opening 66a. A pair of lever support walls (not shown) extending rearward are formed in portions of the partition wall 71 located on both sides in the left-right direction L2 with the first relay tube portion 72 interposed therebetween.

[0028] A first switching groove 76 extending in the front-rear direction is formed on the outer circumferential surface of the guide shaft 74. A plurality of first switching grooves 76 are formed around the axis of the guide shaft 74 at intervals.

[0029] (Trigger mechanism) The trigger mechanism 80 includes a trigger portion 81, a cylinder 82, and a piston 83. The trigger mechanism 80 is capable of circulating the liquid from inside the vertical supply tube portion 60 through the injection tube portion 66 toward the ejection hole 21 side by the rearward swinging of the trigger portion 81.

[0030] The cylinder 82 is fitted into the cylinder tube portion 68. The cylinder 82 is formed in a bottomed cylindrical shape that is open at the front and closed at the rear, and communicates with a portion of the internal flow path R in the vertical supply tube portion 60 that is located above the ball valve 90. The rear wall of the cylinder 82 is formed with a piston guide 84 protruding forward from the center of the rear wall, and a communication hole 85 penetrating the rear wall in the front-rear direction L1 and communicating with the internal flow path R of the vertical supply tube portion 60. The communication hole 85 is formed in a portion of the rear wall located above the piston guide 84. The piston guide 84 is formed in a cylindrical shape with a closed front end, but is not limited to this case, and may be formed in, for example, a solid cylindrical shape.

[0031] The piston 83 is disposed inside the cylinder 82 so as to be movable in the front-rear direction L1 in conjunction with the swing (movement) of the trigger portion 81. As a result, the inside of the cylinder 82 is pressurized and depressurized in accordance with the swing of the piston 83 in the front-rear direction L1.

[0032] As shown in Figures 1 and 2, the piston 83 includes a piston body 110 formed in a cylindrical shape with a top that is open to the rear and closed at the front, and a connecting portion 111 extending forward from the piston body 110. The piston body 110 is supported by the piston guide 84 so as to be movable back and forth. A sliding cylindrical portion (lip portion) 112 that protrudes radially outward from the piston body 110 and comes into close sliding contact with the inner surface of the cylinder 82 is formed at the rear end of the piston body 110.

[0033] The connecting portion 111 is formed in a cylindrical shape extending forward from the front end of the piston body 110. The front end of the connecting portion 111 is formed in a semicircular shape that protrudes forward in a vertical cross section (see FIG. 1), and is formed so as to be flat in the left-right direction L2 in a horizontal cross section (see FIG. 2). Therefore, the front end surface 111a of the connecting portion 111 is smoothly and continuously curved so as to be semicircular and protrude forward in a vertical cross section, while being formed flat in the left-right direction L2 in a horizontal cross section.

[0034] 1 and 2, the connecting portion 111 is formed with a pair of locking recesses (first locking portions according to the present invention) 113 recessed from the outer circumferential surface of the connecting portion 111 along the left-right direction L2. The pair of locking recesses 113 are formed in a portion of the connecting portion 111 located between a front end surface 111a and a base end portion of the connecting portion 111 (a portion where the connecting portion 111 and the front end portion of the piston body 110 are joined). The pair of locking recesses 113 open outward in the left-right direction L2, and are formed so that their outer shape is rectangular when viewed from the side of the trigger-type liquid ejector 1. However, the shape of the pair of locking recesses 113 is not limited to this case, and may be formed, for example, in a circular shape larger than the diameter of a locking protrusion 140 described later in side view.

[0035] The piston 83 configured as described above is biased forward by the elastic restoring force (biasing force) of the elastic plate 86 (see FIG. 2) together with the trigger portion 81. When the trigger portion 81 is in the forwardmost swing position, the piston 83 is located in the corresponding forwardmost position. It should be noted that elastic plate (elastic member according to the present invention) 86 may be disposed in any manner as long as it biases trigger portion 81 forward. For example, elastic plate 86 may be disposed between injection tube portion 66 and trigger portion 81.

[0036] The trigger portion 81 includes a trigger body 87 and a support piece 88, and is disposed in front of the piston 83 so as to be movable back and forth. The trigger body 87 extends in a forward inclined manner from above to below in front of the piston 83. The trigger body 87 is a part that is gripped when performing a spraying operation, and is hooked from the front by, for example, an index finger. The trigger body 87 and the piston 83 are integrally assembled by the engagement between the above-mentioned locking recess 113 and a locking protrusion 140 (described later) and by the abutment between a front end surface 111a of the connecting portion 111 and an abutment portion 130 (described later). As a result, the piston 83 moves back and forth in association with the back and forth movement of the trigger portion 81.

[0037] The support pieces 88 are formed so as to protrude upward from the upper end of the trigger body 87, and are provided as a pair spaced apart in the left-right direction L2. The pair of support pieces 88 are respectively combined with a pair of lever support walls formed on the relay member 70 so as to be rotatable about an axis O4 along the left-right direction L2. This allows the trigger portion 81 to be rotated about the axis O4 with the pair of support pieces 88 as fulcrums.

[0038] The trigger body 87 configured as above will be described in detail later.

[0039] (ball valves, storage valves) A ball valve 90 and a storage valve 100 are provided in the inner cylinder 62 of the vertical supply cylinder portion 60 . The ball valve 90 serves as a check valve that blocks communication between the inside of the container body A and the inside of the cylinder 82 through the internal flow path R when the inside of the cylinder 82 is pressurized, and allows communication between the inside of the container body A and the inside of the cylinder 82 through the inner tube 62 by displacing upward when the inside of the cylinder 82 is depressurized.

[0040] A storage valve 100 is disposed above the ball valve 90. The storage valve 100 is a check valve that allows the supply of liquid from the internal flow path R into the injection tube portion 66, and regulates the backflow of liquid from the injection tube portion 66 into the cylinder 82. As a result, the storage valve 100 has the function of regulating the liquid (and outside air) from the injection tube portion 66 side from entering the cylinder 82 when the pressure inside the cylinder 82 is reduced.

[0041] The storage valve 100 includes a base portion 101, a valve body 102, and an elastic member 103, and is capable of switching between communication and blocking between the interior of the vertical supply tube portion 60 and the ejection hole 21. The base portion 101 is fitted into the inner cylinder 62 and abuts against the lower surface of the top wall portion of the outer cylinder 61. The valve body 102 is disposed below the base portion 101 and is seated on a valve seat 10a formed on the vertical supply cylinder portion 60 so as to be movable upward. The elastic member 103 vertically connects the base portion 101 to the entire unit, and biases the valve body 102 downward. In the illustrated example, the elastic member 103 is an annular hollow spring that is expandable and contractible in the vertical direction.

[0042] The valve body 102 is pressed from above by the elastic member 103, and thus comes into close contact with the valve seat 10a from above. As a result, the valve body 102 blocks communication between the space located above the valve seat 10a in the inner cylinder 62 and the space located below the valve seat 10a.

[0043] (Exterior cover) 1, the exterior cover 30 is formed so as to cover the ejector body 10 at least from both sides in the left-right direction L2 and from above. In the illustrated example, the exterior cover 30 mainly covers the ejector body 10 except for the mounting cap 65 from both sides in the left-right direction L2 and from above. The exterior cover 30 is formed so as to bulge rearward from the vertical supply tube portion 60, and is formed so as to cover the ejector body 10 from the rear as well.

[0044] (Nozzle part) 1, the nozzle portion 20 is attached to the second relay cylindrical portion 73. As a result, the nozzle portion 20 is attached to the ejector main body 10 via the relay member 70. The nozzle portion 20 includes a nozzle wall portion 22 in which an ejection hole 21 is formed, and an attachment tube portion 23 that extends rearward from the nozzle wall portion 22 and is fitted onto the second relay tube portion 73 from the front. The mounting cylinder portion 23 is attached rotatably about the axis O3 in a state in which it is prevented from slipping out of the second relay cylinder portion 73. As a result, the nozzle portion 20 is combined with the relay member 70 so as to be rotatable about the axis O3.

[0045] An inner cylinder 24 is provided protruding rearward from a portion of the nozzle wall 22 located inside the mounting cylinder 23 and fitted rotatably around the guide shaft 74. A second switching groove 25 extending along the front-rear direction L1 is formed on the inner circumferential surface of the inner cylinder 24. Furthermore, a spin chamber 26 that can be communicated with the first switching groove 76 is formed in a concave shape on a portion of the rear surface of the nozzle wall 22 located inside the inner cylinder 24.

[0046] The first switching groove 76 formed in the guide shaft 74 and the second switching groove 25 formed in the inner cylinder portion 24 are connected at a predetermined rotational position of the nozzle portion 20 centered on the axis O3, and are not connected at other rotational positions. The first switching groove 76 and the second switching groove 25 communicate with each other, so that the ejection hole 21 and the inside of the second relay cylinder portion 73 communicate with each other via the spin chamber 26. Therefore, the nozzle portion 20 can switch, as it rotates about the axis O3, between an ejection permissive state in which ejection of liquid from the ejection hole 21 is permitted, and an ejection restricted state in which ejection is restricted.

[0047] (Trigger body) Next, the trigger body 87 constituting the trigger portion 81 will be described in detail. As shown in FIG. 1, the trigger body 87 includes a front plate portion 87a having a front surface that is concavely curved toward the rear when viewed from the side in the left-right direction L2, and a pair of side plate portions 87b extending rearward from the side edges of the front plate portion 87a in the left-right direction L2. A pair of support pieces 88 are formed on the upper ends of the pair of side plate portions 87b so as to extend upward.

[0048] 1 and 2, an accommodating hole 120 penetrating the front plate portion 87a in the front-rear direction is formed in a portion of the front plate portion 87a located in front of the piston 83. The accommodating hole 120 is located in the center of the front plate portion 87a in the left-right direction L2, and is formed in, for example, a rectangular shape when viewed from the front. Furthermore, on the inner side of the accommodation hole 120, a contact portion 130 is formed so as to divide the accommodation hole 120 in the left-right direction L2.

[0049] The abutment portion 130 extends rearward from the front plate portion 87a and includes a pair of opposing walls 131 arranged facing each other with a gap therebetween in the left-right direction L2, and an abutment wall 132 connecting the rear end edges of the pair of opposing walls 131 in the left-right direction L2. As a result, the abutment portion 130 has a shape in which a slit-shaped gap opening forward is secured between the pair of opposing walls 131 and the abutment wall 132 in a cross-sectional view. The pair of opposing walls 131 are formed so that the length from the front plate portion 87a toward the rear is shorter than the pair of side plate portions 87b. As a result, the space in the accommodation hole 120 located rearward of the abutment portion 130 is largely open toward the rear.

[0050] When the piston 83 is located at the frontmost position, the connecting portion 111 is accommodated in the space from the rear. At this time, the contact portion 130 contacts the front end surface 111a of the connecting portion 111 of the piston 83 from the front. Specifically, the rear end surface 132a of the contact wall 132 constituting the contact portion 130 contacts the front end surface 111a of the connecting portion 111 of the piston 83 from the front in a planar or linear manner. In the illustrated example, the rear end surface 132a of the contact wall 132 and the front end surface 111a of the connecting portion 111 contact each other linearly along the left-right direction L2.

[0051] Of the pair of side plate portions 87b, the portions in which the accommodating hole 120 is formed function as inner walls that define the accommodating hole 120. A pair of locking protrusions (second locking portions according to the present invention) 140 that lock from behind to a pair of locking recesses 113 formed in the connecting portion 111 of the piston 83 are formed on the rear end edges of the portions of the pair of side plate portions 87b that function as the inner walls.

[0052] The pair of locking protrusions 140 are formed so as to protrude in the left-right direction L2 from the rear end edges of the pair of side plate portions 87b. Specifically, the pair of locking protrusions 140 are boss-shaped protrusions protruding inward in the left-right direction L2 so as to approach each other, and are formed in a cylindrical shape in the illustrated example. The pair of locking protrusions 140 are inserted into the pair of locking recesses 113 and are locked to the locking recesses 113 from the rear. The pair of locking protrusions 140 are formed in a cylindrical shape with an outer diameter smaller than the inner diameter of the pair of locking recesses 113, and are locked to the locking recesses 113 from the rear so as to be displaceable in the up and down direction. In particular, the pair of locking protrusions 140 are locked to the locking recesses 113 from the rear with a gap H (see FIG. 2) between the pair of locking protrusions 140 and the piston body 110 of the piston 83 in the front-rear direction.

[0053] As described above, the trigger body 87 and the piston 83 are combined as one unit by the engagement between the pair of locking recesses 113 and the pair of locking protrusions 140, and by the abutment between the front end surface 111a of the connecting portion 111 and the rear end surface 132a of the abutment portion 130, and operate in conjunction with each other. In other words, the piston 83 moves back and forth in association with the back and forth movement of the trigger portion 81. Furthermore, when the trigger portion 81 is located at the forward-most swing position, the piston 83 is positioned at the forward-most position.

[0054] The pair of side plate portions 87b are formed with a storage wall 87c that protrudes outward in the left-right direction L2 and opens at least rearward. A part of the elastic plate 86 is stored inside the storage wall 87c. As a result, the elastic plate 86 biases the trigger portion 81 forward.

[0055] (Function of trigger-type liquid ejector) Next, a case where the trigger type liquid ejector 1 configured as described above is used will be described. Note that by operating the trigger part 81 shown in Fig. 1 multiple times, each part of the trigger type liquid ejector 1 is filled with liquid, and the liquid can be sucked up into the vertical supply tube part 60.

[0056] By operating the trigger portion 81 so as to pull it backward as indicated by the arrow F in FIG. 1 against the biasing force of the elastic plate 86 (see FIG. 2), the piston 83 can be moved backward from the frontmost position in conjunction with the trigger portion 81. This allows the inside of the cylinder 82 to be pressurized. Therefore, the liquid in the cylinder 82 can be supplied to the inside of the inner cylinder 62 of the vertical supply tube portion 60, i.e., into the internal flow path R, and the ball valve 90 can be pressed downward and the storage valve 100 can be pushed upward. Specifically, the valve body 102 rises against the biasing force of the elastic member 103 and moves away from the valve seat 10a.

[0057] Therefore, the liquid in the internal flow path R can be circulated through the ejection tube portion 66 toward the ejection hole 21 of the nozzle portion 20. Specifically, as shown in Fig. 1, the liquid can be ejected from the ejection tube portion 66 toward the inside of the second relay tube portion 73 through the ejection opening 66a, and can also be guided to the ejection hole 21 through the first switching groove 76, the second switching groove 25, and the spin chamber 26, and can be ejected from the ejection hole 21 to the outside. As a result, the liquid can be ejected forward from the ejection hole 21.

[0058] 1 is released after the liquid is ejected, the trigger portion 81 can be biased forward by the elastic restoring force of the elastic plate 86, so that the trigger portion 81 can be restored. Therefore, in conjunction with the trigger portion 81, the piston 83 can be restored forward within the cylinder 82. Therefore, the pressure inside the cylinder 82 can be reduced to a pressure lower than the pressure inside the container body A, and the ball valve 90 can be raised. Therefore, the liquid inside the container body A can be sucked up into the internal flow path R and can be sucked into the cylinder 82. This makes it possible to prepare for the next ejection.

[0059] As described above, according to the trigger type liquid ejector 1 of this embodiment, liquid can be ejected from the ejection hole 21 every time the trigger portion 81 is pulled backward.

[0060] In particular, the trigger portion 81 has an abutment portion 130 that abuts against the front end surface 111a of the connecting portion 111 of the piston 83 from the front, so that when the trigger portion 81 is operated rearward, the stress (operating force) acting on the trigger portion 81 can be directly transmitted to the connecting portion 111 via the abutment portion 130. This allows the piston 83 to be pushed into the cylinder 82 in conjunction with the operation of the trigger portion 81, and the inside of the cylinder 82 can be appropriately pressurized. On the other hand, when the trigger portion 81 moves forward to return to its original position, the pair of locking protrusions 140 of the trigger portion 81 are locked to the pair of locking recesses 113 of the connecting portion 111 from behind, so that the forward biasing force acting on the trigger portion 81 can be directly transmitted to the connecting portion 111. This allows the piston 83 to move forward in conjunction with the return movement of the trigger portion 81, and the pressure inside the cylinder 82 can be appropriately reduced.

[0061] In this way, when the piston 83 is moved backward to pressurize the inside of the cylinder 82, the abutment portion 130 can be used, and when the piston 83 is moved forward to reduce the pressure inside the cylinder 82, the locking protrusion 140 and the locking recess 113 that lock with each other can be used. Moreover, the locking protrusion 140 of the trigger portion 81 is locked to the locking recess 113 from the rear with a gap H in the front-rear direction between it and the piston body 110. Therefore, for example, when the trigger portion 81 is suddenly operated backward, even if the piston 83 cannot keep up with the trigger portion 81 due to the pressure inside the cylinder 82, it is possible to prevent the locking protrusion 140 from contacting the piston body 110 from the front. Therefore, it is possible to prevent the locking protrusion 140 from deforming and thereby displacing the piston 83.

[0062] Therefore, it is possible to ensure appropriate operability of the piston 83. This makes it possible to operate the piston 83 with an appropriate stroke amount, and to maintain the sealing between the piston 83 and the cylinder 82 to suppress liquid leakage, etc. Therefore, it is possible to provide a trigger-type liquid ejector 1 with improved operability and quality.

[0063] As described above, according to this embodiment, it is possible to ensure appropriate operability of the piston 83, and it is possible to provide a trigger-type liquid ejector 1 with improved operability and quality. In the trigger type liquid ejector 1 of this embodiment, when the nozzle portion 20 is in a jetting restricted state where jetting is restricted (when the first switching groove 76 and the second switching groove 25 are switched to a non-communicating state), if the trigger portion 81 is operated backward (particularly strongly or suddenly), the pressure in the cylinder 82 is not released, so that the trigger portion 81 is forced to move backward in a state in which the backward movement of the piston 83 is restricted. Therefore, it is considered possible that the locking protrusion 140 will come into contact with the piston body 110 from the front, causing the locking protrusion 140 to deform. However, even in such a case, since the gap H in the front-rear direction is provided between the locking protrusion 140 and the piston body 110, the locking protrusion 140 can be prevented from being deformed. In this way, according to the trigger-type liquid ejector 1 of this embodiment, even if the trigger portion 81 is operated backward when the nozzle portion 20 is positioned in a spray restriction state in which spraying is restricted, deformation of the locking protrusion 140 can be suppressed.

[0064] Furthermore, in this embodiment, the trigger body 87 and the piston 83 can be combined integrally with a simple configuration in which a pair of locking protrusions 140 formed on the trigger body 87 are simply locked into a pair of locking recesses 113 formed in the connecting portion 111 of the piston 83. Therefore, a trigger-type liquid ejector 1 with a simplified configuration and improved ease of assembly can be obtained.

[0065] Furthermore, in this embodiment, the rear end surface 132a of the abutment wall 132 can be brought into line contact with the front end surface 111a of the connecting portion 111 of the piston 83, so that the rear end surface 132a of the abutment wall 132 and the front end surface 111a of the connecting portion 111 can be brought into contact with a sufficient contact area. Therefore, stress can be efficiently transmitted to the piston 83 via the abutment portion 130, and the piston 83 can be smoothly pushed into the cylinder 82 in conjunction with the operation of the trigger portion 81. Therefore, operability can be further improved.

[0066] Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. The embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. The embodiments and their modifications include, for example, those that can be easily imagined by a person skilled in the art, those that are substantially the same, those that are within the scope of the equivalents, and the like.

[0067] For example, in the above embodiment, a trigger-type liquid ejector 1 that ejects liquid forward from the ejection hole 21 was described, but this is not limited to this case, and the trigger-type liquid ejector 1 may also eject liquid in a direction other than forward, such as upward or to the left.

[0068] Furthermore, in the above embodiment, a so-called direct pressure type trigger type liquid ejector 1 that does not include a pressure accumulator valve has been described as an example, but the trigger type liquid ejector may be, for example, a pressure accumulator type that includes a pressure accumulator valve. The accumulator valve is a valve that switches between communication and cut-off between the inside of the cylinder 82 and the ejection hole 21, and is capable of opening when the internal pressure rises to a predetermined level. Note that any known valve structure may be used as the valve structure.

[0069] For example, one example of the accumulator valve has an accumulator valve main body that is disposed inside the second relay cylindrical portion 73 of the nozzle portion 20 and switches between communication and blocking between the inside of the cylinder 82 through the communication hole 75 and the ejection hole 21 through the second switching groove 25. The accumulator valve main body is biased from the rear toward the front (valve closing direction) by a biasing member such as a coil spring, for example, to close the valve and block communication between the inside of the cylinder 82 and the ejection hole 21. When the accumulator valve main body receives a pressure higher than the biasing force of the biasing member, it moves toward the rear (valve opening direction) against the biasing force to open the valve and allow communication between the inside of the cylinder 82 and the ejection hole 21. Specifically, for example, the pressure accumulator valve body has at least a first pressure-receiving portion that receives pressure mainly from the front and a second pressure-receiving portion that receives pressure mainly from the rear. The pressure-receiving area of ​​the first pressure-receiving portion and the pressure-receiving area of ​​the second pressure-receiving portion are different from each other. For example, the pressure-receiving area of ​​the first pressure-receiving portion is formed to be larger than the pressure-receiving area of ​​the second pressure-receiving portion. As a result, when the pressure of the liquid acts on the pressure accumulator valve main body, a rearward pressure acts on the pressure accumulator valve main body due to the area difference between the pressure-receiving area of ​​the first pressure-receiving portion and the pressure-receiving area of ​​the second pressure-receiving portion. Then, when the rearward pressure becomes higher than the biasing force of the biasing member, the pressure accumulator valve main body moves rearward (in the valve opening direction) against the biasing force, thereby opening the valve and allowing communication between the inside of the cylinder 82 and the ejection hole 21. When such a pressure accumulator valve is provided, the pressure of the liquid ejected from the ejection hole 21 can be stabilized, and the liquid can be ejected in a desired form (for example, in the form of a mist, etc.). Therefore, ejection can be performed in a variety of ejection forms. The installation position of the pressure accumulator valve is not limited to the nozzle portion 20.

[0070] In particular, in the case where the nozzle portion 20 is provided with a pressure accumulator valve, the piston 83 is pushed into the cylinder 82 when the trigger portion 81 is operated, and the space between the cylinder 82 and the pressure accumulator valve is pressurized. Therefore, there are cases where the piston 83 is unable to follow the trigger portion 81 in time just before the pressure accumulator valve opens. Therefore, it is considered possible that the locking protrusion 140 may come into contact with the piston main body 110 from the front, causing the locking protrusion 140 to deform. This is likely to occur significantly when the trigger portion 81 is operated strongly or suddenly toward the rear. However, even in such a case, since the gap H in the front-rear direction is provided between the locking protrusion 140 and the piston body 110, the locking protrusion 140 can be prevented from being deformed. Therefore, according to the trigger type liquid ejector 1 of this embodiment, even a pressure accumulation type configuration in which a pressure accumulation valve is provided in the nozzle portion 20 can be suitably adopted.

[0071] Furthermore, in the above embodiment, the case where the locking recess 113 is formed as an example of the first locking portion on the connecting portion 111 of the piston 83, and the locking protrusion 140 is formed as an example of the second locking portion on the trigger body 87 has been described as an example, but the present invention is not limited to these cases. For example, the locking protrusion 140 may be formed on the connecting portion 111 of the piston 83, and the locking recess 113 may be formed on the trigger body 87. Furthermore, the first locking portion and the second locking portion are not limited to the locking recess 113 and the locking protrusion 140 as long as they can be locked to each other. [Explanation of symbols]

[0072] A…Container body 1...Trigger-type liquid ejector 10...Ejector body 20…Nozzle section 21...Blowout hole 60…Vertical supply tube 80...Trigger mechanism 81…Trigger section 82…Cylinder 83…Piston 103...Elastic member 110…Piston body 111...Connection part 113...Latching recess (first locking part) 130...Abutting part 131...Facing wall 132…Abutting wall 140...Latching protrusion (second locking portion)

Claims

1. An ejector body that is attached to a container that contains a liquid; a nozzle portion attached to the ejector body and having an ejection hole for ejecting liquid; The ejector body includes: A vertical supply tube portion that sucks up the liquid in the container body; a trigger mechanism including a trigger portion that is arranged to be movable rearward while being biased forward by an elastic member, and that causes liquid to flow from inside the vertical supply tube portion toward the nozzle hole side by the rearward movement of the trigger portion, the trigger mechanism includes a piston that pressurizes an interior of a cylinder as the trigger portion moves rearward to supply the liquid in the cylinder into the vertical supply tube portion, and reduces the pressure in the cylinder as the trigger portion moves back toward the front to suck up the liquid in the container body into the vertical supply tube portion and introduces it into the cylinder; The piston includes a piston body that is in sliding contact with an inner surface of the cylinder so as to be movable back and forth, and a connecting portion that extends forward from the piston body, the connecting portion includes a first engaging portion provided between a front end surface of the connecting portion and a connecting portion between the connecting portion and the piston body, the trigger portion includes an abutment portion that abuts against the front end surface of the connecting portion from the front and a second locking portion that is locked to the first locking portion from the rear, and the abutment portion and the second locking portion position the piston at a frontmost position when the trigger portion is in a frontmost swing position, 2. A trigger-type liquid ejector, wherein the second engaging portion engages with the first engaging portion from behind with a gap between the second engaging portion and the piston body in the front-rear direction.

2. 2. The trigger type liquid ejector according to claim 1, The first locking portion includes a pair of locking recesses recessed in the left-right direction from an outer circumferential surface of the connecting portion, A trigger-type liquid ejector, wherein the second engagement portion protrudes in the left-right direction from the trigger portion and includes a pair of engagement protrusions that engage with the engagement recesses from behind when inserted into the pair of engagement recesses, respectively.

3. The trigger type liquid ejector according to claim 1 or 2, The abutment portion is A pair of opposing walls extending rearward from a front plate portion of the trigger portion and arranged opposite each other with a gap therebetween in the left-right direction; a contact wall that connects the rear end edges of the pair of opposing walls in the left-right direction, so that the rear end surface comes into surface contact or line contact with the front end surface of the connecting portion.

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