Trigger type liquid ejector

Abstract

To secure proper actuation property of a main piston.SOLUTION: A trigger type liquid jetting device 1 includes: an ejector body 2 installed to a container body A; and a nozzle part 3 in which an ejection hole 4 is formed. The ejector body includes: a vertical supply cylinder part 10; and a trigger mechanism 60 including a trigger part 61 disposed so as to be movable backward while being biased forward by an elastic member 52. The trigger part includes: a trigger body 65; and a main piston 63 for pressing the interior of a main cylinder 62 with the backward movement of the trigger part. In the trigger body, a second locking part 131 is formed that is locked to a first locking part 130 formed in the main piston and positions the main piston in the foremost position when the trigger body is positioned in the foremost swing position. In the trigger body, a regulation part 114 is formed that regulates displacement of forward of the main piston when at least one of the first locking part and the second locking part deforms forward.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 within 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 main cylinder disposed behind the trigger portion, and a main piston that pressurizes the main cylinder as the trigger portion moves rearward, thereby supplying liquid in the main 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 main piston, thereby combining the trigger portion and the main piston with each other. However, when an operation such as quickly moving the trigger part backward is performed, the main piston may not be able to keep up with the trigger part due to the pressure relationship in the main cylinder. In this case, the boss part is subjected to a stress that tries to move backward along with the trigger part, and a stress that tries to suppress the backward movement of the boss part by the main piston trying to stay in place. As a result, there is a risk that the boss part will be deformed toward the front due to the influence of the opposing stresses. In particular, when the pressing force of the main 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 main piston cannot be pushed to a specified position, and the main cylinder cannot be pressurized properly. In addition, the stroke of the main piston may change, which may affect the ejection performance. Furthermore, the main piston may move further forward beyond the forwardmost position, which may cause insufficient sealing between the main cylinder and the main piston, 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 main 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 having a vertical supply tube portion that sucks up liquid in the container body, and a trigger portion disposed so as to be movable rearward in a forwardly biased state by an elastic member, and a trigger mechanism for circulating liquid from within the vertical supply tube portion toward the ejection hole side by the rearward movement of the trigger portion, the trigger portion having a trigger body extending so as to incline forward as it goes from above to below, and a trigger mechanism for pressurizing the inside of a main cylinder as the trigger portion moves rearward to supply the liquid in the main cylinder into the vertical supply tube portion, and a main piston that reduces the pressure inside the main cylinder as it moves back to its original position forward, sucking up the liquid inside the container body into the vertical supply tube portion and introducing it into the main cylinder, wherein the trigger body is formed with a second locking portion that is locked to a first locking portion formed on the main piston, combines the trigger body and the main piston together, and positions the main piston at its forwardmost position when the trigger body is in its forwardmost swing position, and a regulating portion is formed in a portion of the trigger body located in front of the main piston, which regulates the forward displacement of the main piston when at least one of the first locking portion and the second locking portion is deformed forward.

[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 main cylinder can be pressurized using the main piston, and the liquid in the main 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 main cylinder to be reduced using the main piston, so that the liquid inside the container body can be sucked up into the vertical supply tube part and introduced into the main cylinder. This makes it possible to prepare for the next ejection.

[0010] In particular, since the restricting portion is formed on the trigger body, even if at least one of the first and second locking portions is deformed forward, for example, by a sudden operation of the trigger body toward the rear, the restricting portion can be used to restrict the main piston from being displaced forward. This ensures proper operability of the main piston. This makes it possible to operate the main piston with an appropriate stroke amount, maintain the sealing between the main piston and the main cylinder, and suppress liquid leakage. This makes it possible to provide a trigger-type liquid ejector with improved operability and quality.

[0011] (2) A portion of the regulating portion that is located forward of a front end surface of the main piston may be formed with a regulating surface that faces the front end surface of the main piston from the front while the trigger body moves from the forwardmost swing position to the rearmost swing position.

[0012] In this case, even if the main piston is displaced forward by a sudden operation of the trigger body toward the rear, the front end face of the main piston can be brought into surface contact with the regulating surface, and the forward displacement of the main piston can be more reliably suppressed. In particular, since the regulating surface and the front end face of the main piston can be brought into surface contact with each other, displacement of the main piston that tilts in the up-down and left-right directions can also be suppressed. Therefore, the sealing performance between the main cylinder and the main piston can be appropriately maintained.

[0013] (3) The first locking portion may include a through hole penetrating the main piston in the left-right direction, the second locking portion may include a pair of locking protrusions that protrude from the trigger body in the left-right direction and engage with the through hole when inserted into the through hole, and the regulating portion may regulate forward displacement of the main piston when the pair of locking protrusions are deformed forward.

[0014] In this case, the trigger body and the main piston can be combined integrally with a simple configuration in which a pair of boss-shaped locking protrusions formed on the trigger body are simply locked into a through hole formed in the main piston. Therefore, a trigger-type liquid ejector with a simplified configuration and improved ease of assembly can be obtained. Furthermore, even if the pair of locking protrusions are deformed forward, the restricting portion can be used to suppress the main piston from displacing forward.

[0015] (4) The trigger body may be formed with a reinforcing rib extending forward from a connection portion between the pair of locking protrusions and the trigger body.

[0016] In this case, the pair of locking protrusions can be supported from the front by the reinforcing ribs, making it difficult for the pair of locking protrusions to deform forward, thereby further ensuring proper operability of the main piston. Effect of the Invention

[0017] According to the present invention, it is possible to ensure proper operability of the main piston, and to provide a trigger-type liquid ejector with improved operability and quality. [Brief description of the drawings]

[0018] [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] FIG. 2 is a front view of the trigger-type liquid ejector shown in FIG. 1. [Diagram 3]2 is an enlarged perspective view of the periphery of an upper end portion of the trigger portion shown in FIG. 1. [Figure 4] 4 is a cross-sectional view of the trigger portion taken along line AA shown in FIG. 3. [Diagram 5] FIG. 2 is an enlarged cross-sectional view of the periphery of the trigger portion and the main piston shown in FIG. 1, showing a state in which the trigger portion is operated toward the rear. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] 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.

[0020] As shown in Figure 1, the trigger-type liquid ejector 1 of this embodiment comprises an ejector body 2 which is attached to a container body A which contains liquid, a nozzle portion 3 which is attached to the ejector body 2 and has an ejection hole 4 for ejecting the liquid, and a cover body 5 which covers the ejector body 2 and the nozzle portion 3. Unless otherwise specified, each component part of the trigger type liquid ejector 1 is a molded product made of synthetic resin.

[0021] (Ejector body) The ejector body 2 mainly includes a vertical supply tube portion 10, an ejection tube portion 20, an attachment cap 30, a pressure accumulating member 40, a closing member 50, a trigger mechanism 60, and a ball valve 70.

[0022] In this embodiment, the central axis of the vertical supply tube portion 10 is defined as an axis O1, the container body A side along this axis O1 is defined as the lower side, the opposite side is defined as the upper side, and the direction along the axis O1 is defined as the up-down direction. Furthermore, in a plan view seen from the up-down direction, one direction intersecting the axis O1 is defined as the front-rear direction L1, and the direction perpendicular to both the up-down direction and the front-rear direction L1 is defined as the left-right direction L2. Furthermore, in this embodiment, the central axis of the injection tube portion 20 is defined as axis O2. In this embodiment, axis O2 extends in the front-rear direction L1. Therefore, in this embodiment, front-rear direction L1 corresponds to the axial direction along the central axis of the injection tube portion 20. However, the axial direction along axis O2 does not have to coincide with the front-rear direction L1.

[0023] (Vertical supply tube) 1, the vertical supply tube portion 10 extends in the vertical direction and has a function of sucking up liquid inside the container body A. The vertical supply tube portion 10 mainly includes an outer tube 11 and an inner tube 12 fitted into the outer tube 11.

[0024] The outer tube 11 comprises a tube portion 11a into which the inner tube 12 is fitted, a connecting tube portion 11b disposed above the tube portion 11a and having a smaller diameter than the tube portion 11a, and a top wall portion 11c connecting the upper end of the tube portion 11a and the lower end of the connecting tube portion 11b.

[0025] The inner cylinder 12 is formed to extend in the vertical direction and is fitted inside the cylinder portion 11a while being arranged coaxially with the axis O1. This allows the inner cylinder 12 to be combined integrally with the outer cylinder 11. The inner cylinder 12 has a flange portion 12a that is arranged on the upper end opening edge of the mouth of the container body A via a packing. Furthermore, the upper portion of a pipe 13 that extends in the vertical direction and sucks up liquid from the container body A is fitted inside the inner cylinder 12.

[0026] The vertical supply tube portion 10 constructed as described above is attached (screwed) to the mouth of the container body A by means of an attachment cap 30 which presses the flange portion 12a of the inner tube 12 from above.

[0027] (Injection cylinder part) Above the vertical supply tube portion 10, an injection tube portion 20 is disposed. The injection tube portion 20 is connected to the upper end of the connecting tube portion 11b in the vertical supply tube portion 10, and is formed so as to extend forward around the axis O2. The injection tube portion 20 is formed in a cylindrical shape having a front wall and an open rear. A communication hole is formed in the front wall of the injection tube portion 20, penetrating the front wall in the front-rear direction L1. The inside of this communication hole is an injection opening portion 21 that opens forward. The inside of the injection tube portion 20 is also connected to the inside of the connecting tube portion 11b. Furthermore, a rear cylinder portion 22 that is disposed coaxially with the axis O2 is formed at the rear end of the injection cylinder portion 20. The rear cylinder portion 22 is a part that constitutes the injection cylinder portion 20.

[0028] A blocking member 50 that blocks rear cylinder portion 22 from the rear is attached to injection cylinder portion 20 configured as described above. As a result, the entire inside of injection cylinder portion 20 is blocked by blocking member 50.

[0029] (Accumulator member) The pressure accumulating member 40 is disposed within the injection tube portion 20 so as to be movable back and forth, and blocks communication between the interior of the vertical supply tube portion 10 and the ejection holes 4 through the injection tube portion 20. The pressure accumulating member 40 is formed in a rod shape extending in the front-rear direction L1, and blocks communication between the interior of the vertical supply tube portion 10 and the ejection holes 4 through the injection tube portion 20 by abutting against the inner circumferential surface of the injection tube portion 20 in the front-rear direction L1. The pressure accumulating member 40 moves rearward when the pressure within the injection tube portion 20 rises, thereby connecting the interior of the vertical supply tube portion 10 to the ejection holes 4 through the injection tube portion 20.

[0030] (Relay parts) A relay member 80 that connects between injection tube portion 20 and nozzle portion 3 is attached to injection tube portion 20. 1, relay member 80 is attached to injection tube portion 20 from the front. Relay member 80 is located forward of injection opening 21 of injection tube portion 20 and includes an opposing wall portion 81 disposed opposite injection opening 21, a first relay tube portion 82 extending rearward from opposing wall portion 81 and fitted onto injection tube portion 20, a second relay tube portion 83 extending forward from opposing wall portion 81, and a guide shaft 84 located inside second relay tube portion 83 and extending forward from opposing wall portion 81.

[0031] The second relay tube portion 83 and the guide shaft 84 are disposed about an axis O3 that is eccentric downward with respect to the axis O2 of the injection tube portion 20. A communication hole 85 that communicates with the injection opening 21 of the injection tube portion 20 is formed in a portion of the opposing wall portion 81 that is located above the guide shaft 84 and inside the second relay tube portion 83. As a result, the interior of the second relay tube portion 83 communicates with the interior of the injection tube portion 20 through the communication hole 85 and the injection opening 21. A first switching groove (not shown) extending in the front-rear direction L1 is formed on the outer circumferential surface of the guide shaft 84. A plurality of first switching grooves are formed at intervals around the axis O3. A pair of lever support walls (not shown) extending rearward are formed in portions of the opposing wall portion 81 located on both sides in the left-right direction L2 across the second relay tube portion 83. The pair of lever support walls are disposed with a gap between them and the second relay tube portion 83.

[0032] (Trigger mechanism) 1 and 2, the trigger mechanism 60 includes a trigger portion 61, a main cylinder 62, and a main piston 63. The trigger mechanism 60 is capable of circulating the liquid from inside the vertical supply tube portion 10 through the injection tube portion 20 toward the ejection hole 4 side by the rearward swinging of the trigger portion 61.

[0033] The main cylinder 62 is fitted into the cylinder tube portion 15. The main cylinder 62 is formed in a bottomed tube shape that opens forward. The inside of the main cylinder 62 is connected to a portion of the inside of the outer tube 11 of the vertical supply tube portion 10 that is located above the inner tube 12.

[0034] The main piston 63 is disposed in the main cylinder 62 so as to be movable in the front-rear direction L1. The main piston 63 is movable in the front-rear direction L1 in conjunction with the swinging of the trigger portion 61. As a result, the inside of the main cylinder 62 is pressurized and depressurized as the main piston 63 moves in the front-rear direction L1. The main piston 63 is formed in a topped cylindrical shape that is open to the rear and closed at the front. The main piston 63 is biased forward together with the trigger portion 61 by the biasing force of the elastic arm portion 52 described later. The main piston 63 moves rearward as the trigger portion 61 swings rearward, and is pushed into the main cylinder 62. When the trigger portion 61 is in the forwardmost swing position, the main piston 63 is correspondingly located in the forwardmost position.

[0035] The trigger portion 61 includes a trigger body 65 and a support piece 66, and is disposed in front of the main piston 63 so as to be movable back and forth. The trigger body 65 extends in a forward inclined manner from above to below in front of the main piston 63. The trigger body 65 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 65 and the main piston 63 are integrally assembled via a locking protrusion 131 and a through hole 130, which will be described later. As a result, the main piston 63 moves back and forth in association with the back and forth movement of the trigger portion 61.

[0036] The support pieces 66 are formed so as to protrude upward from the upper end of the trigger body 65, and are provided as a pair with a gap therebetween in the left-right direction L2. The pair of support pieces 66 are respectively combined with a pair of lever support walls formed on the relay member 80 so as to be rotatable about an axis O4 along the left-right direction L2. This allows the trigger portion 61 to be rotated about the axis O4 with the pair of support pieces 66 as fulcrums.

[0037] The trigger body 65 configured as described above will be described in detail later.

[0038] (Ball valve) As shown in FIG. 1, the ball valve 70 is provided inside the inner cylinder 12 of the vertical supply cylinder portion 10. The ball valve 70 is disposed inside the upper end of the inner cylinder 12, and is seated removably on an annular tapered cylinder 71 that protrudes inward from the inner peripheral surface of the inner cylinder 12. The ball valve 70 is a check valve that blocks communication between the inside of the container body A and the inside of the main cylinder 62 through the inside of the vertical supply cylinder portion 10 when the inside of the main cylinder 62 is pressurized, and moves upward and separates from the tapered cylinder 71 when the inside of the main cylinder 62 is depressurized, thereby allowing communication between the inside of the container body A and the inside of the main cylinder 62 through the inside of the vertical supply cylinder portion 10.

[0039] In the illustrated example, a plurality of elastic protrusions 72 protruding downward are formed on the lower surface of the top wall portion 11c of the outer cylinder 11. The elastic protrusions 72 are provided at intervals in the circumferential direction. When the ball valve 70 moves upward away from the tapered cylinder 71, the elastic protrusions 72 elastically deform radially outward, expanding the space surrounded by the elastic protrusions 72. This restricts the amount of upward movement of the ball valve 70.

[0040] (Blocking member) 1, the blocking member 50 is assembled to the rear cylinder portion 22 of the injection cylinder portion 20 from the rear. In this way, the blocking member 50 blocks the injection cylinder portion 20 from the rear with the pressure accumulating member 40 trapped inside the injection cylinder portion 20. The blocking member 50 includes at least an elastic piece 51 that contacts the pressure accumulation member 40 from behind and positions the pressure accumulation member 40 in a state in which the injection opening 21 is blocked, and a pair of elastic arm portions (elastic members according to the present invention) 52 that urge the trigger portion 61 forward.

[0041] The blocking member 50 includes a blocking wall 53 that contacts the rear open end of the rear cylindrical portion 22 of the injection cylindrical portion 20 from behind, and a fitting cylinder 54 that extends forward from the blocking wall 53 and is fitted into the inside of the rear cylindrical portion 22. The fitting cylinder 54 is fitted into the inside of the rear cylindrical portion 22 in a state where it is prevented from coming off rearward.

[0042] The elastic piece 51 biases the pressure accumulating member 40 forward after it has moved rearward. Specifically, the elastic piece 51 allows the pressure accumulating member 40 to move rearward by elastically deforming due to an increase in pressure inside the injection tube portion 20, and biases the pressure accumulating member 40 forward by elastically restoring deformation in association with a decrease in pressure inside the injection tube portion 20. In this embodiment, the elastic piece 51 positions the pressure accumulating member 40 so as to block the flow of liquid through the injection opening 21 until the pressure inside the injection tube section 20 reaches a predetermined value, and when the pressure inside the injection tube section 20 reaches or exceeds the predetermined value, it elastically deforms to connect the injection opening 21 to the inside of the vertical supply tube section 10.

[0043] The pair of elastic arm portions 52 are disposed on both sides in the left-right direction L2 across the injection tube portion 20. In a side view seen from the left-right direction L2, the pair of elastic arm portions 52 are in a state of elastic deformation so as to have an upwardly protruding arc shape, and their front end portions (lower end portions) are in contact with the trigger portion 61 from behind. As a result, the elastic arm portions 52 urge the trigger portion 61 forward. The elastic arm portion 52 may be elastically deformed and urge the trigger portion 61 forward only when the trigger portion 61 moves backward.

[0044] The entire closing member 50 including the elastic piece 51 and the elastic arm portion 52 is integrally formed from synthetic resin. Examples of synthetic resin include olefin resin such as polypropylene (PP), polyacetal (POM), polyketone (POK), etc. Furthermore, the entire blocking member 50 may be made of polyethylene terephthalate (PET) that does not contain a copolymer component that is a highly crystalline polyester resin, so-called homopolyethylene terephthalate (homoPET).

[0045] (Nozzle part) 1 and 2, the nozzle portion 3 is attached to the second relay cylindrical portion 83. As a result, the nozzle portion 3 is attached to the ejector main body 2 via the relay member 80. The nozzle portion 3 is disposed forward of the opposing wall portion 81 of the relay member 80, and includes a nozzle wall portion 90 in which the ejection hole 4 is formed, and an external fitting cylinder portion 91 that extends rearward from the nozzle wall portion 90 and is externally fitted from the front onto the second relay cylinder portion 83. The inside of the second relay cylinder portion 83 is capable of communicating with the inside of the injection cylinder portion 20 through a communication hole 85. The outer fitting cylinder portion 91 is attached rotatably about the axis O3 in a state in which it is prevented from slipping out of the second relay cylinder portion 83. As a result, the nozzle portion 3 is combined with the relay member 80 so as to be rotatable about the axis O3.

[0046] Furthermore, an inner cylinder portion 92 that is rotatably fitted onto the guide shaft 84 protrudes rearward from a portion of the nozzle wall portion 90 that is located inside the outer fitting cylinder portion 91. A second switching groove (not shown) that extends along the front-rear direction L1 is formed on the inner peripheral surface of the inner cylinder portion 92.

[0047] The first switching groove formed in the guide shaft 84 and the second switching groove formed in the inner cylinder portion 92 communicate with each other at a predetermined rotational position of the nozzle portion 3 about the axis O3, and are not communicated with each other at other rotational positions. The communication between the first switching groove and the second switching groove communicates the ejection hole 4 with the inside of the second relay cylinder portion 83. Therefore, the nozzle portion 3 can switch between an ejection permissive state in which ejection of liquid from the ejection hole 4 is permitted and an ejection restricted state in which ejection is restricted as the nozzle portion 3 rotates about the axis O3.

[0048] (Cover body) As shown in FIG. 1, the cover body 5 is formed so as to cover the entire vertical supply tube portion 10 except for the lower end portion and the entire injection tube portion 20 at least from both sides in the left-right direction L2 and from above.

[0049] (Trigger body) Next, the trigger body 65 constituting the trigger portion 61 will be described in detail. As shown in FIGS. 1 to 4, the trigger body 65 is integrally formed with a protrusion 100 that protrudes forward in a V-shape when viewed from the side. The protrusion 100 is formed on the upper end of the trigger body 65, and is formed so as to be located forward of the lower end of the elastic arm portion 52 and the main piston 63. The protrusion 100 is formed so as to be wider in the width direction of the trigger body 65 (left-right direction L2) than the lower end of the trigger body 65.

[0050] The protruding portion 100 includes a front wall portion 110 having a first inclined surface 111 and a second inclined surface 112, and a pair of side walls 120 that are connected to the front wall portion 110 and arranged at an interval in the left-right direction L2. As a result, the portion surrounded by the front wall portion 110 and the pair of side walls 120 is an open space that is open to the rear. First inclined surface 111 is formed so as to incline forward as it goes from the top to the bottom. Second inclined surface 112 is formed so as to incline backward as it goes downward from the lower end of first inclined surface 111. As a result, the connecting portion between first inclined surface 111 and second inclined surface 112 is the apex portion that protrudes most forward.

[0051] The front wall portion 110 has an accommodating hole 113 formed therein, penetrating the front wall portion 110 in the front-rear direction. The accommodating hole 113 is located in the center of the front wall portion 110 in the left-right direction L2, and is formed so as to penetrate the first inclined surface 111 and the second inclined surface 112 in the front-rear direction L1. The accommodating hole 113 is formed in a rectangular shape when viewed from the front. Furthermore, inside the accommodation hole 113, a restricting beam portion (restricting portion according to the present invention) 114 is formed so as to divide the accommodation hole 113 in the left-right direction L2.

[0052] In the opening space, a pair of inner side walls 115 are formed on the inner side of the pair of side walls 120, the pair of inner side walls 115 being spaced apart in the left-right direction L2. The pair of inner side walls 115 are formed so as to protrude rearward from the entire front wall 110, and are formed so as to face each other in the left-right direction L2. The accommodation hole 113 is formed on the inner side of the pair of inner side walls 115. Therefore, the inner surfaces of the pair of inner side walls 115 function as the inner wall surfaces of the accommodation hole 113. The pair of support pieces 66 are formed so as to extend further upward from the upper ends of the pair of inner side walls 115 .

[0053] Of the open space, a space S located between the pair of side walls 120 and the pair of inner side walls 115 accommodates a lower end of the elastic arm portion 52. When accommodated in this space S, the elastic arm portion 52 contacts the rear surface of the front wall portion 110 from behind. As a result, the elastic arm portion 52 biases the trigger portion 61 forward.

[0054] The restricting beam portion 114 has a constant width in the left-right direction L2, and is formed to extend in the up-down direction along the shape of the front wall portion 110. However, the restricting beam portion 114 is formed so that the amount of protrusion toward the rear is shorter than the pair of inner side walls 115. As a result, the space of the accommodation hole 113 located behind the restricting beam portion 114 is widely opened toward the rear.

[0055] When the main piston 63 is located at the frontmost position, the front end portion is accommodated in the space from the rear. Therefore, the front end surface 63a of the main piston 63 is located behind the restricting beam portion 114 with a gap between the restricting beam portion 114 and the front end surface 63a. The restricting beam portion 114 is positioned in front of the main piston 63 on the trigger body 65, and serves to restrict the forward displacement of the main piston 63 when a pair of locking protrusions 131, which will be described later, are deformed forward.

[0056] The main piston 63 has a front end portion formed with a through hole (first locking portion according to the present invention) 130 extending in the left-right direction L2. In contrast, the trigger body 65 is provided with a pair of locking protrusions (second locking portions according to the present invention) 131 which are engaged with the through hole 130, combine the trigger body 65 and the main piston 63 together as a unit, and position the main piston 63 at the forwardmost position when the trigger body 65 is in the forwardmost swing position.

[0057] The pair of locking protrusions 131 are formed so as to protrude in the left-right direction L2 from the rear end edges of the pair of inner side walls 115. Specifically, the pair of locking protrusions 131 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 131 are inserted into a through hole 130 formed in the main piston 63 and are locked in the through hole 130. The pair of locking protrusions 131 are locked to the through hole 130 so as to be vertically displaceable within the through hole 130 .

[0058] As described above, the trigger body 65 and the main piston 63 are combined together as a unit by the engagement between the through hole 130 and the pair of locking protrusions 131, and operate in conjunction with each other. In other words, the main piston 63 moves back and forth in association with the back and forth movement of the trigger part 61. Furthermore, when the trigger body 65 is located at the forward-most swing position, the main piston 63 is positioned at the forward-most position.

[0059] Reinforcing ribs 135 are formed on the inner surfaces of the pair of inner side walls 115, respectively, and extend forward from the connection portion between the inner surface of the inner side wall 115 and the locking protrusion 131. The protruding height of the reinforcing ribs 135 from the inner surface of the inner side wall 115 in the left-right direction L2 is set to a height that does not contact the front end of the main piston 63. The pair of locking protrusions 131 are supported from the front by the reinforcing ribs 135, and are therefore structured to be difficult to displace forward.

[0060] A protrusion 136 that protrudes toward the front end surface 63a of the main piston 63 is formed on the rear end surface of the restricting beam portion 114. When the main piston 63 is located at the front-most position, a gap is provided between the protrusion 136 and the front end surface 63a of the main piston 63. As shown in FIG. 5, the protrusion 136 has a restriction surface 136a that faces the front end surface 63a of the main piston 63 from the front while the trigger body 65 moves from the forward most swing position to the rearmost swing position. In this embodiment, when the trigger body 65 is positioned in the rearmost swing position and the main piston 63 is pushed all the way into the main cylinder 62 to its rearmost position, the regulating surface 136a and the front end surface 63a of the main piston 63 are formed so as to face each other.

[0061] In this embodiment, the protrusion 136 having the restriction surface 136a is formed on the rear end surface of the restriction beam 114, but the protrusion 136 is not essential. For example, a part of the rear end surface of the restriction beam 114 may be formed to serve as the restriction surface 136a.

[0062] (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 61 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 10.

[0063] 1, the main piston 63 moves rearward from the frontmost position, pressurizing the inside of the main cylinder 62. This allows the liquid in the main cylinder 62 to be supplied into the vertical supply tube portion 10, and also pressurizes the ball valve 70 downward against the tapered tube 71.

[0064] As a result, the liquid supplied into the vertical supply tube portion 10 can be supplied into the injection tube portion 20 through the connection tube portion 11b. At this time, since the communication between the injection opening portion 21 and the inside of the vertical supply tube portion 10 is blocked by the pressure accumulating member 40, the pressure inside the injection tube portion 20 can be increased.

[0065] When the pressure inside the injection tube portion 20 exceeds a predetermined value, the elastic piece 51 is elastically deformed, so that the pressure accumulating member 40 can be moved rearward against the bias of the elastic piece 51. This allows the injection opening 21 to communicate with the vertical supply tube portion 10. Therefore, the pressurized liquid can be forcefully injected from the injection tube portion 20 through the injection opening 21 into the second relay tube portion 83, and can also be ejected from the ejection hole 4 to the outside.

[0066] After the liquid is ejected, the supply of liquid from the main cylinder 62 through the vertical supply tube 10 to the injection tube 20 can be stopped by releasing the trigger 61. This reduces the pressure in the injection tube 20, causing the elastic piece 51 to undergo elastic restoration deformation. This allows the elastic piece 51 to move the pressure accumulating member 40 forward in a restoration state. This allows the communication between the injection opening 21 and the vertical supply tube 10 to be blocked again, as shown in FIG. 1.

[0067] Furthermore, the trigger portion 61 can be biased forward by the elastic restoring force of the elastic arm portion 52, and the trigger portion 61 can be restored. Therefore, the main piston 63 can be restored forward in the main cylinder 62 in conjunction with the trigger portion 61. Therefore, the pressure inside the main cylinder 62 can be reduced to a pressure lower than the pressure inside the container body A, and the ball valve 70 can be raised and separated from the tapered cylinder 71. Therefore, the liquid in the container body A can be sucked up into the vertical supply tube portion 10 and introduced into the main cylinder 62. This makes it possible to prepare for the next ejection.

[0068] As described above, according to the trigger type liquid ejector 1 of this embodiment, every time the trigger portion 61 is pulled backward, liquid can be ejected from the ejection hole 4. In particular, since the pressure accumulating member 40 is provided, the pressure of the liquid ejected from the ejection hole 4 can be stabilized, and the liquid can be ejected in a desired form (for example, as a mist, etc.).

[0069] In particular, during the above-mentioned liquid ejection process, if the trigger portion 61 is suddenly operated backward, for example, the main piston 63 may not be able to keep up with the trigger portion 61 due to the pressure relationship within the main cylinder 62. In this case, the pair of locking protrusions 131 is subjected to a stress that tries to move backward along with the trigger portion 61, and a stress that tries to suppress the backward movement of the pair of locking protrusions 131 by the main piston 63 trying to stay in place. Therefore, the pair of locking protrusions 131 may be deformed forward due to the influence of the opposing stresses. However, even in such a case, since the trigger body 65 is formed with a regulating beam portion 114, the regulating beam portion 114 can be utilized to prevent the main piston 63 from being unintentionally displaced forward due to the forward deformation of the locking protrusion 131. Therefore, it is possible to ensure proper operability of the main piston 63. This makes it possible to operate the main piston 63 with an appropriate stroke amount, and to maintain the sealing between the main cylinder 62 and suppress liquid leakage, etc. Therefore, it is possible to provide a trigger-type liquid ejector 1 with improved operability and quality.

[0070] As described above, according to this embodiment, it is possible to ensure appropriate operability of the main piston 63, and it is possible to provide a trigger-type liquid ejector 1 with improved operability and quality.

[0071] Furthermore, in this embodiment, a protrusion 136 having a regulating surface 136a is formed on the regulating beam portion 114, so that even if the main piston 63 is displaced forward, the front end surface 63a of the main piston 63 can be brought into surface contact with the regulating surface 136a of the protrusion 136, and the forward displacement of the main piston 63 can be more reliably suppressed. In particular, since the restricting surface 136a and the front end surface 63a of the main piston 63 can be brought into surface contact with each other, it is possible to suppress displacement of the main piston 63 such that the main piston 63 tilts in the up-down direction and the left-right direction L2. Therefore, it is possible to appropriately maintain the sealing performance between the main cylinder 62 and the main piston 63.

[0072] Furthermore, since the reinforcing ribs 135 are formed on the pair of inner side walls 115, the pair of locking protrusions 131 can be supported from the front. Therefore, the pair of locking protrusions 131 can be made difficult to deform toward the front, and proper operability of the main piston 63 can be further ensured.

[0073] Furthermore, the trigger body 65 and the main piston 63 can be combined integrally with a simple configuration in which a pair of locking protrusions 131 formed on the trigger body 65 are simply locked into the through hole 130 formed in the main piston 63. Therefore, a trigger type liquid ejector 1 with a simplified configuration and improved ease of assembly can be obtained.

[0074] Furthermore, according to the trigger type liquid ejector 1 of this embodiment, the pressure accumulating member 40 is provided inside the ejection tube portion 20. Therefore, compared to the conventional case where the pressure accumulating member 40 is provided inside the nozzle portion 3, the nozzle portion 3 can be made smaller and the structure can be simplified, and for example, bulkiness in the front-back direction L1, left-right direction L2, and up-down direction of the nozzle portion 3 can be easily suppressed. Therefore, the entire trigger-type liquid ejector 1 can be made smaller. Furthermore, by providing the pressure accumulating member 40 inside the ejection tube portion 20, it is possible to increase the degree of freedom in the structure of the nozzle portion 3. Therefore, as the trigger-type liquid ejector 1, for example, as in this embodiment, a configuration in which the rotation of the nozzle portion 3 switches between an ejection permitted state in which ejection from the ejection hole 4 is permitted and an ejection restricted state in which ejection is restricted can be easily adopted.

[0075] Furthermore, because pressure accumulator member 40 is provided inside injection barrel portion 20, the internal volume of injection barrel portion 20 can be reduced without increasing the number of parts. This allows the pressure of the liquid inside injection barrel portion 20 to be increased quickly when trigger portion 61 is operated, and reduces the number of times priming is performed. Furthermore, since air is less likely to remain inside ejection tube portion 20, variations in the ejection amount and dripping from ejection hole 4 caused by remaining air can be suppressed.

[0076] 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.

[0077] For example, in the above embodiment, an example was given of the case where the pressure accumulating member 40 is provided over the entire length of the injection tube portion 20, but this is not limited to this case, and for example, the pressure accumulating member 40 may be disposed in only a portion of the injection tube portion 20 in the forward / rearward direction L1.

[0078] Furthermore, in the above embodiment, a trigger-type liquid ejector 1 that ejects liquid forward from the ejection hole 4 has been described; however, 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.

[0079] Furthermore, in the above embodiment, a case has been described in which the main piston 63 is formed with the through hole 130 as an example of the first locking portion, and the trigger body 65 is formed with the locking protrusion 131 as an example of the second locking portion, but the present invention is not limited to these cases. For example, the main piston 63 may be formed with the locking protrusion 131, and the trigger body 65 may be formed with the through hole 130. Furthermore, the first locking portion and the second locking portion are not limited to the through hole 130 and the locking protrusion 131, as long as they can be locked to each other.

[0080] Furthermore, in the above embodiment, the elastic arm portion 52 whose lower end portion contacts the trigger portion 61 from behind in a state where it is elastically deformed to form an arc-like protrusion upward in a side view seen from the left-right direction L2 has been described as an example of the urging member that urges the trigger portion forward, but the present invention is not limited to this case. For example, the elastic arm portion may be configured to contact the trigger portion 61 from behind in a state where it is elastically deformed to form an arc-like protrusion downward. In any case, various shapes and structures can be adopted as the urging member as long as it can urge the trigger portion 61 forward. [Explanation of symbols]

[0081] A…Container body 1...Trigger-type liquid ejector 2...Ejector body 3…Nozzle section 4…Blowout hole 10…Vertical supply tube 52...Elastic arm (elastic member) 60…Trigger mechanism 61…Trigger section 62…Main cylinder 63…Main piston 65…Trigger body 114...Regulation beam section (regulation section) 130...Through hole (first locking portion) 131...Latching protrusion (second locking portion) 135…Reinforcing rib 136...Protrusion 136a…Regulatory aspects

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 portion is A trigger body that extends so as to incline forward as it goes from above to below; a main piston which pressurizes the inside of a main cylinder as the trigger portion moves rearward to supply the liquid in the main cylinder into the vertical supply tube portion, and which reduces the pressure in the main 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 main cylinder, The trigger body is formed with a second locking portion that is locked to a first locking portion formed on the main piston, combines the trigger body and the main piston together, and positions the main piston at a most forward position when the trigger body is in a most forward swing position. A trigger-type liquid ejector characterized in that a regulating portion is formed in a portion of the trigger body located in front of the main piston, which regulates the forward displacement of the main piston when at least one of the first locking portion and the second locking portion is deformed forward.

2. 2. The trigger type liquid ejector according to claim 1, A trigger-type liquid ejector, wherein a portion of the regulating portion that is located forward of the front end surface of the main piston is formed with a regulating surface that faces the front end surface of the main piston from the front while the trigger body moves from the forwardmost swing position to the rearmost swing position.

3. The trigger type liquid ejector according to claim 1 or 2, The first engaging portion includes a through hole penetrating the main piston in the left-right direction, The second locking portion includes a pair of locking protrusions that protrude from the trigger body in the left-right direction and that are locked in the through hole when inserted into the through hole, The regulating portion regulates forward displacement of the main piston when the pair of locking protrusions are deformed forward.

4. 4. The trigger type liquid ejector according to claim 3, A trigger-type liquid ejector, wherein a reinforcing rib is formed on the trigger body and extends forward from a connection portion between the pair of engaging protrusions and the trigger body.

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