Trigger-type liquid dispenser

Abstract

To prevent liquid in a container body from leaking out of an introduction port through an outside air introduction passage because a main piston moved backward does not return to the foremost position.SOLUTION: The trigger mechanism 80 includes the biasing member 84, the front receiving member 85, and the rear receiving member 86 which are provided between the trigger portion 81 and the 83a of the sliding portion of the main piston 83, the 2b of the introduction port of the outside air introduction path 82a is open to the inner circumferential surface of the main cylinder 82, the sliding portion of the main piston located at the foremost position closes the introduction port, and the rear receiving member supports the rear end portion of the biasing member, is provided behind the front receiving member, and is fixed to the ejector main body 2. The front receiving member is fixed to the piston shaft part 83b and supports a front end part of the biasing member.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] A known trigger-type liquid ejector ejects liquid from an ejection hole by causing the sliding part of the main piston to slide rearward on the inner surface of the main cylinder as the trigger part moves rearward. For example, as shown in Patent Document 1 below, the trigger part has an opening that penetrates in the front-to-rear direction and a connecting protrusion provided on the inside of the opening, and the connecting protrusion is inserted into a connecting hole formed in the piston shaft part of the main piston, connecting the piston shaft part to the trigger part, and the piston shaft part is inserted inside a cylindrical biasing member that biases the trigger part forward. In this configuration, the biasing member is provided outside the main cylinder where it does not come into contact with the liquid, thereby preventing the biasing member from being altered by the liquid. Note that the trigger-type liquid jetter shown in Patent Document 1 below is provided with a storage cylinder and storage plunger that enable continuous jetting of liquid in addition to the main cylinder and main piston, so the biasing member needs to have a high spring constant, which limits the material that can be used for the biasing member, and there is a concern that this material may be altered by contact with the liquid. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-98189 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional trigger-type liquid sprayers, for example, when an unexpected external force is applied to the trigger portion in a forward direction during transportation, or when some component (such as an enclosed pipe component) is inserted into the opening of the trigger portion from the front and the main piston is pushed rearward, there is a risk that the connecting protrusion will come off the connecting hole and the connection between the trigger portion and the piston shaft will be released. Here, the cylindrical biasing member abuts against the trigger portion with the piston shaft inserted inside. Therefore, if the connection between the trigger portion and the piston shaft is released and an unintended external force is applied rearward to the trigger portion, the trigger portion will move rearward together with the main piston. However, after the external force is released, even if the trigger portion moves forward in its restoration state due to the biasing member, the main piston will not move forward in its restoration state and will remain in its position. In this case, as the liquid in the container body is supplied into the main cylinder, the inlet port of the outside air introduction passage that introduces outside air into the container body opens to the inner surface of the main cylinder, and when the main piston is positioned in the forward-most position, the sliding part of the main piston blocks the inlet port, so there is a risk that the liquid in the container body will leak out of the inlet port through the outside air introduction passage.

[0005] The present invention provides a trigger-type liquid ejector in which the main piston, which has moved rearward, does not return to its forwardmost position, and liquid in the container body can be prevented from leaking out of the inlet port through an outside air inlet passage. [Means for solving the problem]

[0006] a trigger mechanism having a trigger section disposed in front of the vertical supply section so as to be movable rearward, the trigger section causing the liquid to flow from the vertical supply section toward the nozzle hole when the trigger section moves rearward; a storage cylinder extending in the front-rear direction, into which the liquid that has passed through the vertical supply section is supplied when the trigger section moves rearward; and a storage plunger disposed in the storage cylinder so as to be movable in the front-rear direction, the storage plunger moving rearward and being urged forward when the liquid is supplied into the storage cylinder. The mechanism comprises a main cylinder formed in a horizontal, bottomed cylindrical shape that opens forward and has a closed rear end opening, and that communicates with the interior of the vertical supply tube section; a sliding section that is fitted into the main cylinder so as to be slidable back and forth; and a main piston that has a piston shaft that protrudes forward from the sliding section towards the outside of the main cylinder, and that moves rearward from its forwardmost position as the trigger section moves rearward to pressurize the inside of the main cylinder; and a biasing member, a front support member, and a rear support member that are provided between the trigger section and the sliding section, and an inlet port of the outside air introduction passage opens on the inner peripheral surface of the main cylinder, and the sliding section of the main piston, which is located at the forwardmost position, closes the inlet port, and the rear support member supports the rear end of the biasing member, and is provided behind the front support member and fixed to the ejector main body, and the front support member is fixed to the piston shaft and supports the front end of the biasing member.

[0007] The rear end of the urging member is supported by a rear receiving member fixed to the ejector body, and the front end of the urging member is supported by a front receiving member fixed to the piston shaft.As the main piston moves back and forth, the front receiving member moves back and forth, causing the urging member to expand and contract in the front-to-back direction between it and the rear receiving member.Regardless of the front-to-back position of the trigger, if the main piston moves rearward from its forward-most position, the forward urging force of the urging member is exerted on the main piston via the front receiving member. Therefore, for example, if an unexpected external force directed forward is applied to the trigger portion, or the main piston is pushed rearward by a member other than the trigger portion, causing the trigger portion and main piston to move away from each other in the front-to-rear direction, and then the main piston is pushed rearward by the trigger portion and the sliding portion opens the inlet, the forward biasing force of the biasing member will return the main piston to its forwardmost position, and the sliding portion will close the inlet, preventing the liquid in the container body from leaking out of the inlet through the outside air introduction passage.

[0008] The trigger portion may be provided with a push-in protrusion that protrudes rearward and abuts against the front end of the piston shaft portion in the front-to-rear direction, and as the trigger portion moves rearward, the push-in protrusion pushes the front end of the piston shaft portion rearward, causing the main piston to move rearward.

[0009] The trigger portion is provided with a push-in protrusion that protrudes rearward and abuts against the front end of the piston shaft in the front-to-rear direction, and as the trigger portion moves rearward, the push-in protrusion pushes the front end of the piston shaft rearward, causing the main piston to move rearward. Therefore, when an unexpected external force is applied forward to the trigger portion, the push-in protrusion moves forward away from the front end of the piston shaft, preventing the external force from being transmitted to the main piston. This makes it possible to ensure a sealed state between the sliding portion and the inner surface of the main cylinder, for example, even if an unexpected external force is applied forward to the trigger portion.

[0010] A pushed-in recess recessed rearward may be formed at the front end of the piston shaft, and the rear end of the push-in protrusion may abut against the inner surface of the pushed-in recess in the front-rear direction.

[0011] Since the rear end of the push-in protrusion abuts against the inner surface of the push-in recess formed at the front end of the piston shaft in the front-to-back direction, the position of the push-in protrusion relative to the front end of the piston shaft is stabilized, thereby preventing the trigger portion from wobbling when pulled.

[0012] The trigger portion may have a front wall that faces the front end portion of the piston shaft portion in the fore-and-aft direction, and the push-in protrusion may extend rearward from a portion on the rear surface of the front wall that faces the front end portion of the piston shaft portion in the fore-and-aft direction.

[0013] The front wall of the trigger portion faces the front end portion of the piston shaft portion in the front-to-rear direction, and the front end portion of the piston shaft portion is covered from the front by the front wall, so that the main piston can be prevented from being pushed rearward by members other than the trigger portion.

[0014] The biasing member may be formed in a cylindrical shape extending in the front-to-rear direction, the piston shaft portion may be inserted inside the biasing member, and at least one of the front support member and the rear support member may be provided with a covering tube that covers the biasing member over its entire length in the front-to-rear direction.

[0015] At least one of the front receiving member and the rear receiving member is provided with a covering tube that covers the urging member over its entire length in the front-to-rear direction, making it difficult to see the urging member from the outside, improving the design, and preventing liquids and other substances scattered by spraying from adhering to the urging member.

[0016] The covering tube may comprise a rear covering tube extending forward from the rear receiving member and a front covering tube extending rearward from the front receiving member, and either the rear covering tube or the front covering tube may be inserted inside the other tube so as to be movable back and forth.

[0017] The covering tube comprises a rear covering tube and a front covering tube, and either one of the rear covering tube or the front covering tube is inserted inside the other tube so as to be able to move back and forth, so that as the trigger part moves back and forth, the main piston can move stably and straight without tilting in the front and back direction. [Effects of the Invention]

[0018] According to the above aspect of the present invention, the rearwardly moved main piston does not return to the frontmost position, and the liquid in the container body can be prevented from leaking out of the introduction port through the outside air introduction passage. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a vertical cross-sectional view of a trigger-type liquid ejector according to one embodiment. [Figure 2] FIG. 2 is an enlarged view of a portion of FIG. [Figure 3] FIG. 3 is a diagram showing a state in which the main piston in FIG. 2 is positioned at the rearmost position. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in Fig. 1, the trigger-type liquid ejector 1 of this embodiment comprises an ejector main body 2, a nozzle member 3, and a cover 5. 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 is attached to a container body A containing a liquid via an attachment cap 30. The ejector body 2 mainly includes a vertical supply tube portion 10, a storage cylinder 40, a storage plunger 50, a trigger mechanism 80, and an outside air introduction passage 2b.

[0022] In this embodiment, the central axis of the vertical supply tube portion 10 is referred to as the axis O1, the container body A side along the axis O1 is referred to as the lower side, and the opposite side is referred to as the upper side, and the direction along the axis O1 is referred to as the up-down direction. A direction intersecting the axis O1 as viewed from the up-down direction is referred to as the front-rear direction, and a direction perpendicular to the front-rear direction as viewed from the up-down direction is referred to as the left-right direction.

[0023] The vertical supply tube portion 10 extends vertically and sucks up the liquid inside the container body A. The upper part of a pipe 10a that also extends vertically and sucks up the liquid from the container body A is fitted into the vertical supply tube portion 10. The vertical supply tube portion 10 is formed in a double-cylinder shape having an outer tube and an inner tube. The vertical supply tube portion 10 is attached to the container body A with an attachment cap 30. The mounting cap 30 is formed in the shape of a topped cylinder having an annular top wall, and the lower end of the vertical supply cylinder 10 is inserted inside this top wall.

[0024] The vertical supply tube portion 10 is provided with a main cylinder tube portion 110 and a connecting tube portion 20. The main cylinder tubular portion 110 is provided above the mounting cap 30, protrudes forward, and is formed in a horizontally oriented, bottomed tubular shape that opens forward and has a closed rear end opening. A second space S2 is provided between the outer peripheral surface of the rear part of the lower end of the main cylinder tubular portion 110 and the vertical supply tubular portion 10. The connecting tube portion 20 protrudes forward and is provided above the main cylinder tube portion 110, connecting the interior of the vertical supply tube portion 10 to the interior of the storage cylinder 40. The connecting tube portion 20 extends forward from the upper end of the vertical supply tube portion 10. Both ends of the connecting tube portion 20 in the front-to-rear direction are open. The rear end opening of the connecting tube portion 20 opens into the vertical supply tube portion 10. The front end opening of the connecting tube portion 20 is sealed by a blocking plug 100.

[0025] The storage cylinder 40 is provided above the vertical supply tube section 10 and the connecting tube section 20. A central axis O2 of the storage cylinder 40 extends in the front-to-rear direction. The storage cylinder 40 straddles the vertical supply tube section 10 in the front-to-rear direction, with the rear part of the storage cylinder 40 protruding rearward from the vertical supply tube section 10 and the front part of the storage cylinder 40 protruding forward from the vertical supply tube section 10. The rear end of the storage cylinder 40 is located rearward of the mounting cap 30. The lower end of the storage cylinder 40 is formed integrally with the upper end parts of the vertical supply tube section 10 and the connecting tube section 20.

[0026] A supply hole 41 is formed in the lower end of the front end of the storage cylinder 40, penetrating vertically and connecting the interior of the storage cylinder 40 to the interior of the connecting cylindrical portion 20. The supply hole 41 is located behind the blocking plug 100. When the trigger portion 81 moves rearward, liquid that has passed through the vertical supply cylindrical portion 10 and the connecting cylindrical portion 20 is supplied through the supply hole 41 to the interior of the storage cylinder 40 (storage space 40a, described below).

[0027] The storage plunger 50 is disposed in the storage cylinder 40 so as to be movable in the front-rear direction. The storage plunger 50 moves rearward as liquid is supplied to the storage space 40a. The storage plunger 50 blocks communication between the interior of the vertical supply tube portion 10 and the ejection holes 4 through the interior of the connecting tube portion 20, and allows communication between the interior of the vertical supply tube portion 10 and the ejection holes 4 through the interior of the connecting tube portion 20 when moved rearward. The storage plunger 50 has a sliding cylindrical portion 50a that slides tightly in the front-to-rear direction all around the inner circumferential surface of the storage cylinder 40. A supply hole 41 opens into a portion of the storage cylinder 40 located forward of the sliding cylindrical portion 50a (hereinafter referred to as storage space 40a). Liquid from the vertical supply cylindrical portion 10 is stored in the storage space 40a. The storage space 40a expands as the storage plunger 50 moves rearward as liquid is supplied. On the outer peripheral surface of the storage plunger 50, a support protrusion 50b is formed at a portion located rearward of the sliding cylindrical portion 50a, and extends continuously around the entire circumference.

[0028] A plunger biasing member 60 is provided to bias the storage plunger 50 forward after it has moved rearward. In this embodiment, the plunger biasing member 60 biases the storage plunger 50 forward before the storage plunger 50 moves rearward. The plunger biasing member 60 is, for example, a metal coil spring. The front end of the plunger biasing member 60 abuts against the support protrusion 50b of the storage plunger 50 from behind the support protrusion 50b. The rear end of the plunger biasing member 60 is fitted into and fixed to the rear end of the storage cylinder 40.

[0029] An injection tube portion 70 is provided extending forward from the storage cylinder 40. Liquid from the vertical supply tube portion 10 that has passed through the storage space 40a is supplied into the injection tube portion 70. The injection tube portion 70 is in communication with the interior of the vertical supply tube portion 10 through the storage space 40a, the supply hole 41, and the interior of the connecting tube portion 20.

[0030] The trigger mechanism 80 includes a trigger portion 81, a main cylinder 82, a main piston 83, a biasing member 84, a front receiving member 85, and a rear receiving member 86. The trigger mechanism 80 causes the liquid to flow from inside the vertical supply tube portion 10 through the connecting tube portion 20 toward the ejection hole 4 side by moving the trigger portion 81 rearward.

[0031] The main cylinder 82, main piston 83, and biasing member 84 are formed in a cylindrical shape extending in the front-rear direction, and the front support member 85 and rear support member 86 are formed in an annular shape with their front and rear surfaces facing in the front-rear direction. The main cylinder 82, main piston 83, biasing member 84, front support member 85, and rear support member 86 are arranged coaxially with a common axis extending in the front-rear direction. Hereinafter, this common axis will be referred to as axis O3, the direction intersecting axis O3 as viewed from the front-rear direction will be referred to as cylinder radial direction, and the direction circumferential around axis O3 as viewed from the front-rear direction will be referred to as cylinder circumferential direction.

[0032] The trigger portion 81 is disposed in front of the vertical supply tube portion 10 so as to be swingable around a rotation axis 81f toward the rear. The rotation axis 81f is formed at the upper end of the trigger portion 81 and extends in the left-right direction. The trigger portion 81 extends in the up-down direction and is disposed below the injection tube portion 70. The trigger portion 81 is provided in front of the main cylinder 82 and straddles the main piston 83 and the main cylinder 82 in the up-down direction. The rotation axis 81f of the trigger portion 81 is supported by the nozzle member 3 so as to be rotatable around an axis extending in the left-right direction.

[0033] A stopper T is provided in the gap in the front-rear direction between the trigger portion 81 and the main cylinder 82. The stopper T is sandwiched between the trigger portion 81 and the main cylinder 82 in the front-rear direction, thereby restricting the rearward movement of the trigger portion 81. The stopper T is provided detachably in the gap. In the illustrated example, the stopper T is combined with the nozzle member 3 and is provided rotatably about the nozzle axis O4 of the nozzle member 3 relative to the ejector body 2. The nozzle axis O4 extends in the front-rear direction and is disposed coaxially with the ejection holes 4. The nozzle axis O4 and the axis O3 are positioned in the same left-right direction. Note that the stopper T does not necessarily have to be provided.

[0034] The trigger portion 81 includes a pair of left and right side walls 81a (see FIGS. 2 and 3), a front wall 81b, and a push-in protrusion 81c.

[0035] The pair of left and right side walls 81a are formed in the shape of plates with their front and back surfaces facing the left-right direction. A rotation shaft 81f is formed at the upper end of the side walls 81a, protruding outward in the left-right direction and supported by the nozzle member 3. The rear end edge of the side walls 81a extends forward as it goes from top to bottom, and presents a curved shape that protrudes rearward when viewed from the left-right direction. The front wall 81b connects the front ends of the pair of left and right side walls 81a. The front wall 81b is formed in a plate shape with its front and back surfaces facing the front-rear direction. The rear surface of the front wall 81b faces the front end of the piston shaft 83b of the main piston 83 in the front-rear direction. No opening extending through in the front-rear direction is formed in the part of the front wall 81b that faces the front end of the piston shaft 83b of the main piston 83 in the front-rear direction. The push-in protrusion 81c protrudes rearward and abuts against the front end of the piston shaft portion 83b of the main piston 83 in the front-rear direction. As the trigger portion 81 moves rearward, the push-in protrusion 81c pushes the front end of the piston shaft portion 83b rearward, causing the main piston 83 to move rearward. The push-in protrusion 81c is formed in a rod shape and extends rearward from a portion of the rear surface of the front wall 81b that faces the front end of the piston shaft portion 83b in the front-rear direction. The rear end of the push-in protrusion 81c is formed in a semi-spherical shape that protrudes rearward. The push-in protrusion 81c is provided in the center of the front wall 81b in the left-right direction. The push-in protrusion 81c extends downward from the front to the rear and is located forward of the rear end edge of the side wall 81a.

[0036] The main cylinder 82 is fitted into the main cylinder tubular portion 110 and is disposed behind the trigger portion 81. The main cylinder 82 is formed in a horizontally oriented, bottomed tubular shape that opens forward and has a closed rear end opening. A communication passage 2a that connects the inside of the main cylinder 82 with the inside of the vertical supply tubular portion 10 is formed in the bottom wall of each of the main cylinder 82 and the main cylinder tubular portion 110.

[0037] As shown in Figure 2, an inlet 82a is formed in the front part of the main cylinder 82, penetrating in the cylinder diameter direction. The inlet 82a is connected to a first space S1 between the outer peripheral surface of the main cylinder 82 and the inner peripheral surface of the main cylinder tubular portion 110. The first space S1 extends continuously over the entire length in the cylinder circumferential direction. A first communication hole 110a is formed in the main cylinder tubular portion 110, connecting the first space S1 to the second space S2. A second communication hole 10d is formed in the wall surface of the vertical supply tubular portion 10 that defines the second space S2, connecting the second space S2 to the inside of the container body A. The inlet 82a, the first space S1, the first communication hole 110a, the second space S2, and the second communication hole 10d constitute an outside air introduction passage 2b that introduces outside air into the container body A as the liquid in the container body A is supplied into the main cylinder 82. The inlet 82a opens to the inner circumferential surface of the main cylinder 82 and is closed by the sliding portion 83a of the main piston 83, which is positioned at the foremost position.

[0038] The main piston 83 has a sliding portion 83a fitted inside the main cylinder 82 so as to be able to slide back and forth, and a piston shaft portion 83b protruding forward from the sliding portion 83a towards the outside of the main cylinder 82, and moves rearward from the frontmost position as the trigger portion 81 moves rearward. As the main piston 83 moves back and forth, the inside of the main cylinder 82 is pressurized and depressurized. The main piston 83 is formed in a horizontally facing, top-closed cylinder shape that opens rearward and has a closed front-end opening. A sliding portion 83a is provided at the rear end of the main piston 83. A piston shaft portion 83b protrudes forward from the sliding portion 83a toward the outside of the main cylinder 82, and its front end abuts against the trigger portion 81.

[0039] In the illustrated example, the front end of the piston shaft portion 83b is inserted between the pair of left and right side walls 81a and abuts against the rear end of the pushing protrusion 81c in the front-to-rear direction. A pushed-in recess 83c that is recessed toward the rear is formed at the front end of the piston shaft portion 83b. The rear end of the pushing protrusion 81c abuts against the inner surface of the pushed-in recess 83c in the front-to-rear direction. The pushed-in recess 83c is formed on the front end surface of the piston shaft portion 83b and has a curved shape that is recessed toward the rear in a vertical cross-sectional view along the up-down and front-to-rear directions. The pushed-in recess 83c is arranged coaxially with the axis O3.

[0040] The biasing member 84 is provided between the trigger portion 81 and the sliding portion 83a of the main piston 83, is formed in a cylindrical shape extending in the front-rear direction, and is, for example, a metal coil spring. The biasing member 84 may be made of, for example, resin or other elastic material. The piston shaft portion 83b is inserted inside the biasing member 84. The biasing member 84 is provided in a position where it does not come into contact with liquid.

[0041] The rear receiving member 86 is provided between the trigger portion 81 and the sliding portion 83a of the main piston 83, and supports the rear end portion of the urging member 84. The rear receiving member 86 is provided behind the front receiving member 85, and is fixed to the ejector body 2. The piston shaft portion 83b is inserted inside the rear receiving member 86. In the example shown, the rear receiving member 86 is fitted into and fixed in the main cylinder 82. The rear end portion of the urging member 84 is supported on the front surface of the rear receiving member 86.

[0042] The front receiving member 85 is provided between the trigger portion 81 and the sliding portion 83a of the main piston 83, is fixed to the piston shaft portion 83b, and supports the front end portion of the biasing member 84. As a result, the main piston 83 is directly biased forward by the biasing force of the biasing member 84. The piston shaft portion 83b is inserted inside the front receiving member 85. The front receiving member 85 is located rearward of the front end surface of the piston shaft portion 83b. The front receiving member 85 is provided at the front end portion of the piston shaft portion 83b and is located forward of the main cylinder 82. A fitting cylinder 85b is formed on the inner peripheral edge of the front receiving member 85, extending rearward and fitted and fixed to the front end portion of the piston shaft portion 83b. The front receiving member 85, together with the front end portion of the piston shaft portion 83b, is inserted between the pair of left and right side walls 81a over the entire circumference except for the lower end portion. When the trigger portion 81 moves rearward, the front receiving member 85 enters between the pair of left and right lateral walls 81a over the entire periphery, as shown in FIG.

[0043] At least one of the front receiving member 85 and the rear receiving member 86 is provided with a covering tube 87 that covers the entire length of the biasing member 84 in the front-rear direction. In this embodiment, the covering tube 87 comprises a rear covering tube 86a extending forward from the rear receiving member 86 and a front covering tube 85a extending rearward from the front receiving member 85, and either the rear covering tube 86a or the front covering tube 85a is inserted inside the other tube so as to be movable back and forth.

[0044] The rear covering tube 86a extends forward from the outer peripheral edge of the rear receiving member 86 and protrudes forward from the front end opening of the main cylinder 82. The rear covering tube 86a is fitted inside the main cylinder 82. The front covering tube 85a extends rearward from the outer peripheral edge of the front receiving member 85, and its rear end is inserted into the front end of the rear covering tube 86a. The size of the front covering tube 85a in the front-to-rear direction is smaller than the size of the rear covering tube 86a in the front-to-rear direction.

[0045] 1, a ball valve 90 and a storage valve 91 are provided in the vertical supply tube portion 10. A communication passage 2a opens into the vertical supply tube portion 10 at a portion located between the ball valve 90 and the storage valve 91.

[0046] The ball valve 90 is a check valve that blocks communication between the inside of the container body A and the inside of the main cylinder 82 through the inside of the vertical supply tube section 10 when the inside of the main cylinder 82 is pressurized, and displaces upward when the inside of the main cylinder 82 is depressurized, thereby allowing communication between the inside of the container body A and the inside of the main cylinder 82 through the inside of the vertical supply tube section 10. The storage valve 91 is disposed above the ball valve 90. The storage valve 91 is a check valve that allows the supply of liquid from the vertical supply tube portion 10 through the connecting tube portion 20 to the storage space 40a, and restricts the outflow of liquid from the storage space 40a through the connecting tube portion 20 into the vertical supply tube portion 10.

[0047] (cover) The cover 5 covers the ejector body 2 while exposing the ejection holes 4. The cover 5 covers the entire vertical supply tube portion 10 of the ejector body 2 except for the lower end portion, the entire injection tube portion 70, and the entire storage cylinder 40 from at least both left and right sides and above.

[0048] (Nozzle member) The nozzle member 3 has ejection holes 4 for ejecting liquid, and is attached to the ejector body 2. The nozzle member 3 includes a fitting cylindrical portion 31, a nozzle cylinder 32, and a bearing portion .

[0049] The fitting cylinder portion 31 is fitted into the injection cylinder portion 70. The fitting cylinder portion 31 is fitted onto the outside of the injection cylinder portion 70 from the front of the injection cylinder portion 70. Nozzle cylinder 32 is attached to the front end of fitting cylinder portion 31. Nozzle cylinder 32 is formed with ejection holes 4 that open to the front and eject liquid that has passed through injection cylinder portion 70 forward. The bearing portion 34 protrudes downward from a pair of left and right sandwiching walls provided on both sides of the fitting cylindrical portion 31 in the left-right direction. The sandwiching walls are attached to the front end portion of the ejector main body 2. The bearing portion 34 protrudes downward from the sandwiching walls and extends in a curved manner rearward, rotatably supporting the rotation shaft 81f of the trigger portion 81. The inside of the bearing portion 34, into which the rotation shaft 81f is inserted, is closed at the top, front, and bottom and open at the rear. The bearing portion 34 is provided in the middle portion in the front-to-rear direction on the lower end surface of the sandwiching walls.

[0050] (The action of the trigger-type liquid jet) Next, a description will be given of a case where the trigger-type liquid ejector 1 configured as described above is used. It is assumed that liquid is filled into each part of the trigger-type liquid ejector 1 by operating the trigger part 81 multiple times. First, the stopper T is rotated around the nozzle axis O4 relative to the ejector body 2 to retract from the gap in the front-rear direction between the trigger part 81 and the main cylinder 82. This allows the trigger part 81 to move backward.

[0051] When the trigger portion 81 is pulled and moved rearward, the main piston 83 moves rearward against the biasing force of the biasing member 84, and pressure is applied inside the main cylinder 82. As a result, the liquid inside the main cylinder 82 is supplied into the vertical supply tube portion 10 through the communication passage 2a. The liquid supplied into the vertical supply tube portion 10 presses the ball valve 90 downward and pushes the storage valve 91 upward.

[0052] As a result, the liquid in the vertical supply tube portion 10 is supplied to the storage space 40a of the storage cylinder 40 through the connecting tube portion 20 and the supply hole 41, and the storage space 40a is pressurized. As the storage space 40a is pressurized, the storage plunger 50 moves rearward against the biasing force of the plunger biasing member 60, and the liquid fills the storage space 40a. As the storage plunger 50 moves rearward, the pressurized liquid in the storage space 40a reaches the ejection hole 4 through the injection tube portion 70. As a result, the liquid is ejected forward from the ejection hole 4.

[0053] As described above, each time the trigger portion 81 is pulled rearward, liquid can be ejected from the ejection hole 4, and the storage plunger 50 can be moved rearward to store liquid in the storage space 40a.

[0054] When the main piston 83 moves rearward as the trigger portion 81 is pulled, the sliding portion 83a moves rearward away from the introduction port 82a, opening the introduction port 82a to the outside. When the trigger portion 81 is pulled, the rear end of the pushing protrusion 81c of the trigger portion 81 slides rearward along the inner surface of the pushed-in recess 83c formed in the front end of the piston shaft portion 83b of the main piston 83. As the main piston 83 moves rearward, the front receiving member 85 and the front covering tube 85a enter rearward inside the rear covering tube 86a, as shown in FIG. 3. At this time, the biasing member 84 is compressed and deformed in the front-to-rear direction as the front receiving member 85 approaches the rear receiving member 86 rearward.

[0055] Thereafter, when the trigger portion 81 is released, the main piston 83 moves forward in its restoration state due to the elastic restoring force (biasing force) of the biasing member 84, reducing the pressure inside the main cylinder 82 to a level lower than the pressure inside the container body A, and the ball valve 90 rises while the storage valve 91 remains closed. Therefore, the liquid inside the container body A is sucked up into the vertical supply tube portion 10 and introduced into the main cylinder 82 through the communication passage 2a. This makes it possible to prepare for the next ejection.

[0056] As the main piston 83 moves forward in its restoration, the trigger portion 81 having the push-in protrusion 81c that abuts against the front end of the piston shaft portion 83b also moves forward in its restoration. Furthermore, since the inlet port 82a is open to the outside until the main piston 83 returns from the rear to the frontmost position, as the liquid in the container body A is sucked up into the vertical supply tube portion 10, outside air is introduced into the container body A through the outside air introduction passage 2b.

[0057] When the pulling of the trigger portion 81 is stopped, the supply of liquid to the storage space 40a through the vertical supply tube portion 10 and the connecting tube portion 20 stops, but the storage plunger 50 begins to move forward due to the biasing force of the plunger biasing member 60. At this time, the outflow of liquid from the storage space 40a into the vertical supply tube portion 10 is restricted by the storage valve 91. As a result, the liquid filled in the storage space 40a reaches the ejection hole 4 through the injection tube portion 70 and continues to be ejected forward through the ejection hole 4. In this way, liquid can be ejected not only when the trigger portion 81 is pulled backward, but also when the trigger portion 81 is not operated, and liquid can be ejected continuously.

[0058] As explained above, according to the trigger-type liquid ejector 1 of this embodiment, the rear end of the urging member 84 is supported by the rear receiving member 86 fixed to the ejector body 2, and the front end of the urging member 84 is supported by the front receiving member 85 fixed to the piston shaft portion 83b. Therefore, as the main piston 83 moves back and forth, the front receiving member 85 moves back and forth, causing the urging member 84 to expand and contract in the front-to-back direction between it and the rear receiving member 86. Therefore, regardless of the front-to-back position of the trigger portion 81, when the main piston 83 moves rearward from its forwardmost position, the forward urging force of the urging member 84 is exerted on the main piston 83 via the front receiving member 85.

[0059] Therefore, for example, if an unexpected external force directed forward is applied to the trigger portion 81, or the main piston 83 is pushed rearward by a member other than the trigger portion 81, causing the trigger portion 81 and main piston 83 to move away from each other in the front-to-rear direction, and then the main piston 83 is pushed rearward by the trigger portion 81 and the sliding portion 83a opens the inlet 82a, the forward biasing force of the biasing member 84 will return the main piston 83 to its forwardmost position, and the sliding portion 83a will close the inlet 82a, thereby preventing the liquid in the container body A from leaking out of the inlet 82a through the outside air introduction passage 2b.

[0060] The trigger portion 81 is provided with a push-in protrusion 81c that protrudes rearward and abuts against the front end of the piston shaft portion 83b in the front-to-rear direction, and as the trigger portion 81 moves rearward, the push-in protrusion 81c pushes the front end of the piston shaft portion 83b rearward, causing the main piston 83 to move rearward, so that when an unexpected external force is applied forward to the trigger portion 81, the push-in protrusion 81c moves forward away from the front end of the piston shaft portion 83b, preventing the external force from being transmitted forward to the main piston 83. This makes it possible to ensure, for example, a sealed state between the sliding portion 83a and the inner circumferential surface of the main cylinder 82, even if an unexpected external force is applied forward to the trigger portion 81.

[0061] Since the rear end of the push-in protrusion 81c abuts against the inner surface of the push-in recess 83c formed at the front end of the piston shaft portion 83b in the front-to-back direction, the position of the push-in protrusion 81c relative to the front end of the piston shaft portion 83b is stabilized, and the trigger portion 81 can be prevented from wobbling when the trigger portion 81 is pulled.

[0062] The front wall 81b of the trigger portion 81 faces the front end portion of the piston shaft portion 83b in the front-to-rear direction, and the front end portion of the piston shaft portion 83b is covered from the front of the piston shaft portion 83b by the front wall 81b, so that the main piston 83 can be prevented from being pushed rearward by members other than the trigger portion 81.

[0063] At least one of the front receiving member 85 and the rear receiving member 86 is provided with a covering tube 87 that covers the urging member 84 over the entire length in the front-to-rear direction, making it difficult to see the urging member 84 from the outside, improving the design, and preventing liquids and the like scattered by spraying from adhering to the urging member 84.

[0064] The covering tube 87 comprises a rear covering tube 86a and a front covering tube 85a, and either the rear covering tube 86a or the front covering tube 85a is inserted inside the other tube so as to be able to move back and forth. As a result, as the trigger portion 81 moves back and forth, the main piston 83 can move stably and straight without tilting in the front-to-back direction.

[0065] 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 spirit 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, and those that are equivalent.

[0066] For example, the trigger mechanism 80 may have a connecting hole formed in the front end of the main piston 83 in the left-right direction, and the trigger portion 81 may have no push-in protrusion 81c but has an opening that penetrates in the front-rear direction, and a pair of left and right connecting protrusions that are provided inside the opening and connected to the connecting holes in the main piston 83. The rear covering tube 86a may be inserted inside the front covering tube 85a. The covering tube 87 may not be provided.

[0067] In addition, within the scope of the spirit of the present invention, it is possible to replace the components in the above-described embodiments with well-known components as appropriate, and the above-described embodiments and the above-described variations may be combined as appropriate.

[0068] The aspects of the present invention are as follows, for example. <1> an ejector body attached to a container containing a liquid; a nozzle member attached to the ejector body and having ejection holes for ejecting the liquid; The ejector body includes: a vertical supply tube portion that sucks up the liquid in the container body; an outside air introduction passage for introducing outside air into the container body; a trigger mechanism including a trigger portion disposed in front of the vertical supply tube portion so as to be movable rearward, the trigger portion moving rearward to cause the liquid to flow from inside the vertical supply tube portion toward the ejection holes; a storage cylinder extending in the front-rear direction and into which the liquid that has passed through the vertical supply tube portion is supplied by rearward movement of the trigger portion; a storage plunger that is disposed in the storage cylinder so as to be movable in the front-rear direction, and that moves rearward and is urged forward as liquid is supplied into the storage cylinder; The trigger mechanism includes: a main cylinder formed in a horizontally oriented cylindrical shape with a bottom that opens forward and a closed rear end opening, the main cylinder communicating with the inside of the vertical supply cylindrical portion; a main piston having a sliding portion fitted within the main cylinder so as to be slidable forward and backward, and a piston shaft portion protruding forward from the sliding portion toward the outside of the main cylinder, the main piston moving rearward from a forwardmost position as the trigger portion moves rearward to apply pressure to the inside of the main cylinder; a biasing member, a front receiving member, and a rear receiving member provided between the trigger portion and the sliding portion, an inlet of the outside air introduction passage opens on an inner circumferential surface of the main cylinder; The sliding portion of the main piston located at the most forward position closes the inlet port, the rear support member supports a rear end of the biasing member, is provided behind the front support member, and is fixed to the ejector body; The front receiving member is fixed to the piston shaft portion and supports a front end portion of the biasing member. <2> The trigger portion is provided with a push-in protrusion that protrudes rearward and abuts against a front end portion of the piston shaft portion in the front-rear direction, As the trigger portion moves rearward, the pushing protrusion pushes the front end portion of the piston shaft portion rearward, thereby moving the main piston rearward. <1> The trigger-type liquid ejector according to claim 1. <3> A recessed portion to be pressed in is formed at the front end of the piston shaft portion so as to be recessed rearward, and a rear end of the pushing protrusion abuts against an inner surface of the recessed portion in the front-rear direction. <2> The trigger-type liquid ejector according to claim 1. <4> the trigger portion includes a front wall that faces a front end portion of the piston shaft portion in the front-rear direction, the push-in projection extends rearward from a portion of the rear surface of the front wall that faces the front end of the piston shaft in the front-rear direction; <2> or <3> The trigger-type liquid ejector according to claim 1. <5> The biasing member is formed in a cylindrical shape extending in the front-rear direction, and the piston shaft portion is inserted into the biasing member, a covering tube that covers the biasing member over the entire length in the front-rear direction is provided on at least one of the front receiving member and the rear receiving member; <1> from <4> 10. A trigger-type liquid ejector according to any one of the preceding claims. <6> The covering tube includes a rear covering tube extending forward from the rear receiving member and a front covering tube extending rearward from the front receiving member, One of the rear covering tube and the front covering tube is inserted inside the other tube so as to be movable back and forth. <5> The trigger-type liquid ejector according to claim 1. [Explanation of symbols]

[0069] 1 trigger-type liquid jet 2 Squirt body 2b Outside air intake passage 3 Nozzle member 4 Spout hole 10 Vertical supply tube 40 Storage cylinder 50 Reservoir Plunger 80 Trigger mechanism 81 Trigger section 81b front wall 81c Push-in protrusion 82 Main cylinder 82a entrance 83 Main piston 83a Sliding part 83b Piston shaft 83c Pressed recess 84 biasing member 85 Front support member 85a Front cover tube 86 Rear support member 86a Rear cover tube 87 Covered tube A Container body

Claims

1. an ejector body attached to a container containing a liquid; a nozzle member attached to the ejector body and having ejection holes for ejecting the liquid; The ejector body includes: a vertical supply tube portion that sucks up the liquid in the container body; an outside air introduction passage for introducing outside air into the container body; a trigger mechanism including a trigger portion disposed in front of the vertical supply tube portion so as to be movable rearward, the trigger portion moving rearward to cause the liquid to flow from inside the vertical supply tube portion toward the ejection holes; a storage cylinder extending in the front-rear direction and into which the liquid that has passed through the vertical supply tube portion is supplied by rearward movement of the trigger portion; a storage plunger that is disposed in the storage cylinder so as to be movable in the front-rear direction, and that moves rearward and is urged forward as liquid is supplied into the storage cylinder; The trigger mechanism comprises: a main cylinder formed in a horizontally oriented cylindrical shape with a bottom that opens forward and a closed rear end opening, the main cylinder communicating with the inside of the vertical supply cylindrical portion; a main piston having a sliding portion fitted within the main cylinder so as to be slidable forward and backward, and a piston shaft portion protruding forward from the sliding portion toward the outside of the main cylinder, the main piston moving rearward from a forwardmost position as the trigger portion moves rearward to apply pressure to the inside of the main cylinder; a biasing member, a front receiving member, and a rear receiving member provided between the trigger portion and the sliding portion, an inlet of the outside air introduction passage opens on an inner circumferential surface of the main cylinder; The sliding portion of the main piston located at the most forward position closes the inlet port, the rear support member supports a rear end of the biasing member, is provided behind the front support member, and is fixed to the ejector body; The front receiving member is fixed to the piston shaft portion and supports a front end portion of the biasing member.

2. The trigger portion is provided with a push-in protrusion that protrudes rearward and abuts against a front end portion of the piston shaft portion in the front-rear direction, 2. The trigger-type liquid ejector according to claim 1, wherein the pushing protrusion pushes the front end of the piston shaft rearward as the trigger portion moves rearward, thereby moving the main piston rearward.

3. 3. The trigger-type liquid ejector according to claim 2, wherein a pushed-in recess recessed toward the rear is formed at the front end of the piston shaft, and the rear end of the push-in protrusion abuts against the inner surface of the pushed-in recess in the front-to-rear direction.

4. the trigger portion includes a front wall that faces a front end portion of the piston shaft portion in the front-rear direction, 4. The trigger-type liquid ejector according to claim 2, wherein the push-in projection extends rearward from a portion of the rear surface of the front wall that faces the front end of the piston shaft in the front-rear direction.

5. The biasing member is formed in a cylindrical shape extending in the front-rear direction, and the piston shaft portion is inserted into the biasing member, 4. The trigger-type liquid ejector according to claim 1, wherein at least one of the front receiving member and the rear receiving member is provided with a covering cylinder that covers the biasing member over the entire length in the front-rear direction.

6. The covering tube includes a rear covering tube extending forward from the rear receiving member and a front covering tube extending rearward from the front receiving member, 6. The trigger-type liquid ejector according to claim 5, wherein either one of the rear covering barrel and the front covering barrel is inserted inside the other barrel so as to be movable back and forth.

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