Trigger-type liquid dispenser

Abstract

To prevent a trigger part from coming off from a front end part of a main piston even when an unexpected forward external force is applied to the trigger part.SOLUTION: An ejector body (2) is provided with a pair of mounting wall sections (71) provided on both sides in the left-right direction of an injection tube section to which liquid having passed through a storage cylinder is supplied, and a covering wall section (72) located below the pair of mounting wall sections and extending in the front-rear direction, wherein a nozzle member (3) is provided with a pair of sandwiching wall sections (33) which are sandwiched in the left-right direction in a state in which vertical movement is restricted by the pair of mounting wall sections, and the nozzle member (3) extends in a curved manner toward the rear while projecting downward from the sandwiching wall sections. The front end portion of the covering wall portion is located between the lower end surface of the sandwiching wall portion and the rear end edge of the pivot hook, and is in contact with or close to the pivot, and the outer surfaces of the attachment wall portion and the covering wall portion facing outward in the left-right direction are connected to each other via the reinforcing wall portion 73. 81f.SELECTED DRAWING: Figure 3

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 swings rearward. For example, as shown in Patent Document 1 below, a connecting protrusion formed on the trigger part is inserted into a connecting hole formed in the front end of the main piston, thereby connecting the front end of the main piston to the trigger part, and a portion of the main piston located between the sliding part and the trigger 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 ejectors, if an unexpected external force is applied to the trigger portion in the forward direction, for example during transportation, there is a risk that the connecting protrusion will come off the connecting hole and the trigger portion will come off the front end of the main piston. Here, the cylindrical biasing member abuts against the trigger portion with the front end of the main piston inserted inside. Therefore, if the trigger portion comes off the front end of the main piston, and an unintended external force is applied to the trigger portion in a rearward direction, 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 that 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 that can prevent the trigger portion from coming off the front end of the main piston even if an unexpected external force is applied to the trigger portion in the forward direction. [Means for solving the problem]

[0006] A trigger-type liquid ejector according to one aspect of the present invention comprises an ejector body attached to a container body containing liquid, and a nozzle member attached to the ejector body and having an ejection hole formed therein for ejecting liquid, wherein the ejector body has a vertical supply tube portion that sucks up liquid from within the container body, an outside air introduction passage that introduces outside air into the container body, and a trigger portion disposed in front of the vertical supply tube portion so as to be able to swing rearward about a rotation axis in a forward biased state, and wherein rearward swinging of the trigger portion causes liquid to flow from within the vertical supply tube portion towards the ejection hole side. a storage cylinder that extends in the front-rear direction and into which the liquid that has passed through the vertical supply cylinder is supplied by the rearward swing 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 the liquid is supplied into the storage cylinder; an injection cylinder that extends forward from the storage cylinder and into which the liquid that has passed through the storage cylinder is supplied; and a plunger that is disposed on both sides of the injection cylinder in the left-right direction perpendicular to the front-rear direction and the up-down direction. the trigger mechanism comprises a pair of mounting wall portions, each of which is formed in a cylindrical shape with a bottom and a closed rear end opening, and which communicates with the inside of the vertical supply tube portion; a main cylinder having a sliding portion fitted in the main cylinder so as to be slidable in the front-rear direction, and which protrudes forward from the sliding portion towards the outside of the main cylinder and has a front end connected to the trigger portion; and a portion of the main piston located between the sliding portion and the trigger portion is inserted inside the main piston. a cylindrical biasing member that biases the trigger portion forward, wherein a connecting protrusion formed on either the front end of the main piston or the trigger portion is inserted into a connecting hole formed on the other, thereby connecting the front end of the main piston to the trigger portion, an inlet of the outside air introduction passage opens on an inner circumferential surface of the main cylinder, and a sliding portion of the main piston located at a frontmost position closes the inlet, and the nozzle members are provided on both sides of a fitting cylindrical portion that is fitted into the injection cylindrical portion and that sandwich the fitting cylindrical portion in the left-right direction,The device comprises a pair of sandwiching walls that are sandwiched in the left-right direction with their up-down movement restricted by the pair of mounting walls, and a bearing hook that protrudes downward from the sandwiching walls and extends in a curved manner rearward, rotatably supporting the rotation shaft of the trigger part, wherein the front end of the covering wall part is located between the lower end surface of the sandwiching wall part and the rear end edge of the bearing hook and abuts or is close to the rotation shaft of the trigger part, and the outer surfaces of the mounting wall part and the covering wall part that face outward in the left-right direction are connected via a reinforcing wall part.

[0007] Since the outer surfaces facing outward in the left-right direction of the mounting wall portion and the covering wall portion are connected via the reinforcing wall portion, when an unexpected external force is applied forward to the trigger portion and the trigger portion attempts to swing forward around the rotation axis, this external force is transmitted to the mounting wall portion of the ejector body via the bearing hook and clamping wall portion of the nozzle member, and even if the mounting wall portion attempts to displace upward relative to the covering wall portion, this displacement is restricted by the reinforcing wall portion. Therefore, even if an unexpected external force is applied to the trigger portion in the forward direction, the reinforcing wall portion maintains the relative positions of the mounting wall portion and the covering wall portion, making it possible to restrict the trigger portion from swinging excessively forward around the rotation axis, and preventing the connecting protrusion from coming out of the connecting hole and the trigger portion from coming off the front end of the main piston. This makes it possible to prevent the liquid in the container from leaking out of the inlet port through the outside air intake passage even if an unexpected external force is applied to the trigger portion in a trigger-type liquid ejector that is provided outside the main cylinder and does not come into contact with the liquid, and has a spring member with a high spring constant that enables continuous ejection.

[0008] The longitudinal size of the mounting wall portion may be greater than the longitudinal size of the covering wall portion, the front end portion of the mounting wall portion may be located forward of the front end portion of the covering wall portion, and the upper portion of the reinforcing wall portion connected to the outer surface of the mounting wall portion may protrude forward more than the lower portion connected to the outer surface of the covering wall portion.

[0009] The front-to-rear dimension of the mounting wall portion is greater than the front-to-rear dimension of the covering wall portion, and the front end portion of the mounting wall portion is located forward of the front end portion of the covering wall portion, so that the pair of mounting wall portions can stably hold the clamping wall portion of the nozzle member. The upper part of the reinforcing wall portion, which is connected to the outer surface of the mounting wall portion, protrudes further forward than the lower part, which is connected to the outer surface of the covering wall portion, so that the mounting wall portion can be reliably prevented from displacing upward relative to the covering wall portion due to a forward external force suddenly applied to the trigger portion.

[0010] The vertical supply tube portion is provided with a main cylinder tube portion that protrudes forward and opens forward, and a connecting tube portion that protrudes forward and is arranged above the main cylinder tube portion, connecting the interior of the vertical supply tube portion with the interior of the storage cylinder, and the main cylinder is fitted into the main cylinder tube portion, and the storage cylinder is arranged above the connecting tube portion and straddles the vertical supply tube portion in the front-to-back direction, and the lower end of the connecting tube portion and the upper end of the main cylinder tube portion may be connected via a connecting wall.

[0011] Since the lower end of the connecting tube portion and the upper end of the main cylinder tube portion are connected via a connecting wall, when an unexpected external force is applied forward to the trigger portion and the trigger portion attempts to swing forward around the rotation axis, this external force is transmitted via the bearing hook and clamping wall portion of the nozzle member to the mounting wall portion of the ejector body, the injection tube portion, the storage cylinder, and the connecting tube portion, and even if the connecting tube portion etc. attempts to displace upward relative to the main cylinder tube portion, this displacement is restricted by the connecting wall. Therefore, even if an unexpected external force is applied to the trigger portion in the forward direction, the relative positions of the connecting tube portion and the main cylinder tube portion are maintained by the connecting wall, making it possible to restrict the trigger portion from swinging excessively forward around the rotation axis, and reliably preventing the trigger portion from coming off the front end of the main piston.

[0012] The storage cylinder spans the vertical supply tube section in the front-to-rear direction, and a reinforcing rib may be provided integrally with the storage cylinder and the vertical supply tube section so as to connect the rear portion of the storage cylinder that protrudes rearward from the vertical supply tube section to the vertical supply tube section.

[0013] A reinforcing rib is provided integrally with the storage cylinder and the vertical supply tube portion so as to connect the rear of the storage cylinder and the vertical supply tube portion together. Therefore, when an unexpected external force is applied forward to the trigger portion and the trigger portion attempts to swing forward around the rotation axis, this external force is transmitted via the bearing hook and clamping wall portion of the nozzle member to the mounting wall portion of the ejector body, the injection tube portion, and the storage cylinder, and even if the storage cylinder attempts to tilt so that the rear portion is displaced downward, this tilt is restricted by the reinforcing rib. Therefore, even if an unexpected external force is applied to the trigger portion in the forward direction, the reinforcing rib prevents the storage cylinder from tilting, making it possible to restrict the trigger portion from swinging excessively forward around the rotation axis, thereby reliably preventing the trigger portion from coming off the front end of the main piston. [Effects of the Invention]

[0014] According to the above aspect of the present invention, even if an unexpected external force is applied to the trigger portion in the forward direction, the trigger portion can be prevented from coming off the front end portion of the main piston. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a vertical cross-sectional view of a trigger-type liquid ejector according to an embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged view of a portion of FIG. [Figure 3] FIG. 2 is a side view of the trigger-type liquid ejector of FIG. 1 with the cover removed. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. [Figure 5] FIG. 2 is a perspective view of a vertical section showing a part of the ejector body of FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0016] 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.

[0017] (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, an injection tube portion 70, a trigger mechanism 80, an outside air introduction passage 2b, a pair of mounting wall portions 71, and a pair of covering wall portions 72.

[0018] 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.

[0019] 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.

[0020] 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 cylindrical shape with 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. A vertical gap is provided between the lower end of the connecting tube portion 20 and the upper end of the main cylinder tube portion 110. The connecting tube portion 20 extends forward from the upper end of the vertical supply tube portion 10. Both front-to-rear end portions of the connecting tube portion 20 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.

[0021] The lower end of the connecting tube portion 20 and the upper end of the main cylinder tube portion 110 are connected via a connecting wall 101. The connecting wall 101 is provided in the vertical gap between the lower end of the connecting tube portion 20 and the upper end of the main cylinder tube portion 110. The connecting wall 101 is formed in a plate shape with its front and back surfaces facing the left-right direction. When viewed from the left-right direction, the connecting wall 101 has a rectangular shape that is long in the front-to-rear direction. The rear end of the connecting wall 101 is connected to the outer peripheral surface of the vertical supply tube portion 10. The front end of the connecting wall 101 is located rearward of the front end of the main cylinder tube portion 110. The connecting wall 101 is connected to the left-to-right centers of the connecting tube portion 20, the main cylinder tube portion 110, and the vertical supply tube portion 10.

[0022] 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.

[0023] A reinforcing rib 102 is provided that is integrally formed with the storage cylinder 40 and the vertical supply tube portion 10 so as to integrally connect the rear portion of the storage cylinder 40 and the vertical supply tube portion 10. The reinforcing rib 102 connects the outer peripheral surface of the rear portion of the storage cylinder 40 with the outer peripheral surface of the upper portion of the vertical supply tube portion 10. The reinforcing rib 102 is formed in a plate shape with the front and back surfaces facing the left-right direction. When viewed from the left-right direction, the reinforcing rib 102 has a rectangular shape that is long in the up-down direction. The reinforcing rib 102 is connected to the left-right center of each of the storage cylinder 40 and the vertical supply tube portion 10.

[0024] 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 swings 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 (a storage space 40a, described below).

[0025] 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. A support protrusion 50b is formed on the outer peripheral surface of the storage plunger 50 at a portion located rearward of the sliding cylindrical portion 50a, and extends continuously around the entire circumference.

[0026] The plunger biasing member 60 biases 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.

[0027] The injection tube 70 extends forward from the storage cylinder 40. Liquid from the vertical supply tube 10 that has passed through the storage space 40a is supplied into the injection tube 70. The injection tube 70 is in communication with the interior of the vertical supply tube 10 through the storage space 40a, the supply hole 41, and the interior of the connecting tube 20.

[0028] The trigger mechanism 80 includes a trigger portion 81, a main cylinder 82, a main piston 83, and a biasing member 84. The trigger mechanism 80 causes the liquid to flow from the vertical supply tube portion 10 through the connecting tube portion 20 toward the nozzle hole 4 by the rearward swing of the trigger portion 81.

[0029] The main cylinder 82, the main piston 83, and the biasing member 84 are formed in a cylindrical shape extending in the front-rear direction, and 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.

[0030] The trigger portion 81 is disposed in front of the vertical supply tube portion 10 so as to be swingable rearward about a rotation shaft 81f in a forward biased state. The rotation shaft 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 disposed 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 shaft 81f of the trigger portion 81 is supported by the nozzle member 3 so as to be rotatable about an axis extending in the left-right direction. 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. Note that the stopper T does not necessarily have to be provided.

[0031] The trigger portion 81 includes a pair of left and right side walls 81a, a front wall 81b, and a pair of left and right push-in walls 81c.

[0032] 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 lateral walls 81a together. The front wall 81b is formed in a plate shape with its front and back surfaces facing the front-rear direction. The pair of left and right push-in walls 81c protrude rearward from the front wall 81b and are formed as plates with their front and back surfaces facing left and right. The push-in walls 81c are provided on both left and right sides of the front wall 81b, sandwiching the center in the left and right direction. A left-right gap is provided between the push-in walls 81c and the side walls 81a. This gap is narrower than the distance between the pair of left and right push-in walls 81c. The rear end edges of the push-in walls 81c extend forward from top to bottom and are located rearward of the rear end edges of the side walls 81a. Each of the pair of left and right push-in walls 81c has a connecting protrusion 81g that protrudes inward in the left-right direction and is connected to the front end of the main piston 83. A connecting hole 83b is formed in the front end of the main piston 83, penetrating it in the left-right direction, and the connecting protrusion 81g is inserted into the connecting hole 83b. This connects the front end of the main piston 83 to the trigger portion 81. The connecting protrusion 81g is provided at the center in the up-down direction at the rear of the pushing wall 81c, and is located forward of the rear end edge of the lateral wall 81a. Alternatively, a connecting protrusion 81g may be formed on the front end of the main piston 83, and a connecting hole 83b may be formed in the trigger portion 81. The connecting protrusion 81g may extend in a direction intersecting the left-right direction.

[0033] 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 cylindrical shape with a bottom that opens forward and 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. 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.

[0034] The main piston 83 has a sliding portion 83a that is fitted within the main cylinder 82 so as to be slidable back and forth. The main piston 83 is formed in a cylindrical shape with an opening facing rearward and a closed front end. The main piston 83 protrudes forward from the sliding portion 83a toward the outside of the main cylinder 82, and its front end is connected to the trigger portion 81. The sliding portion 83a is provided at the rear end of the main piston 83. The front end of the main piston 83 is inserted between a pair of pushing walls 81c and connected to the trigger portion 81. The main piston 83 is urged forward by the urging force of the urging member 84 via the trigger portion 81. The main piston 83 moves back and forth in conjunction with the swinging of the trigger portion 81 in the back and forth direction. The pressure inside the main cylinder 82 is increased and decreased as the main piston 83 moves back and forth.

[0035] The biasing member 84 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. A portion of the main piston 83 located between the sliding portion 83a and the trigger portion 81 is inserted inside the biasing member 84, and biases the trigger portion 81 forward. The biasing member 84 is located in a position where it does not come into contact with liquid. The front end opening edge of the biasing member 84 abuts against the rear end edge of the push-in wall 81c of the trigger portion 81. The rear end of the biasing member 84 is supported by a spring bearing 130 attached to the front end opening of the main cylinder 82.

[0036] The spring bearing 130 is formed in a cylindrical shape extending in the front-rear direction, and is inserted into and fixed in the main cylinder 82. The rear portion of the urging member 84 is inserted into the spring bearing 130. As shown in FIG. 2 , an annular receiving portion 131 is formed at the rear end of the spring bearing 130, protruding radially inward and extending continuously over the entire length of the cylinder in the circumferential direction. The main piston 83 is inserted inside the receiving portion 131. The receiving portion 131 is located forward of the rear end of the main piston 83. The rear end opening edge of the urging member 84 abuts against the front surface of the receiving portion 131.

[0037] Here, the ejector main body 2 is provided with a pair of side wall portions 135 that cover the biasing member 84 from both the left and right sides. In the illustrated example, the side wall portions 135 protrude forward from the spring bearing 130 and are formed in the shape of a plate with its front and back surfaces facing the left-right direction. The front ends of the pair of side wall portions 135 cover the rear end portion of the trigger portion 81 from the outside in the left-right direction. The front ends of the side wall portions 135 abut or are close to the outer surfaces of the lateral walls 81a of the trigger portion 81 that face outward in the left-right direction.

[0038] 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.

[0039] 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.

[0040] In this embodiment, as shown in Figures 3 to 5, the ejector main body 2 has a pair of mounting wall portions 71 provided on both sides of the injection tube portion 70 in the left-right direction, and covering wall portions 72 provided separately below the pair of mounting wall portions 71 and extending in the front-to-rear direction. The rear opening edge of the injection tube portion 70 and the front opening edge of the storage cylinder 40 are connected via a partition wall 42 whose front and back surfaces face the front-rear direction. The partition wall 42 protrudes in the left-right direction and downward relative to the injection tube portion 70 and the storage cylinder 40. The mounting wall portion 71 and the covering wall portion 72 protrude forward from the partition wall 42 .

[0041] The mounting wall portion 71 is formed in the shape of a plate with its front and back surfaces facing the left-right direction. When viewed from the left-right direction, the mounting wall portion 71 has a rectangular shape that is long in the front-rear direction. The front ends of the mounting wall portion 71 and the injection tube portion 70 are located at the same position in the front-rear direction. Protrusions 71a that protrude inward in the left-right direction and extend in the front-rear direction are formed on both ends of the mounting wall portion 71 in the up-down direction. Protrusions 71a are provided over the entire length of the mounting wall portion 71 in the front-rear direction and are connected to the front surface of the partition wall 42. The covering wall portions 72 are located directly below the pair of mounting wall portions 71. The covering wall portions 72 are formed in the shape of a plate with the front and back surfaces facing the left-right direction. When viewed from the left-right direction, the covering wall portion 72 has a rectangular shape that is long in the front-rear direction. The front end portion of the covering wall portion 72 abuts against or is close to the rotation shaft 81f of the trigger portion 81 from behind the rotation shaft 81f. The size of the mounting wall portion 71 in the front-rear direction is larger than the size of the covering wall portion 72 in the front-rear direction, and the front end of the mounting wall portion 71 is located forward of the front end of the covering wall portion 72.

[0042] In this embodiment, the outer surfaces of the mounting wall portion 71 and the covering wall portion 72 facing outward in the left-right direction are connected via the reinforcing wall portion 73. The reinforcing wall portion 73 is formed in a plate shape with its front and back surfaces facing left and right. An upper portion of the reinforcing wall portion 73 connected to the outer surface of the mounting wall portion 71 is located above the rotation axis 81f of the trigger portion 81. A front end portion of the upper portion of the reinforcing wall portion 73 is located forward of the rotation axis 81f of the trigger portion 81, and a rear end portion is located rearward of the rotation axis 81f. An upper portion of the reinforcing wall portion 73 connected to the outer surface of the mounting wall portion 71 protrudes forward more than a lower portion connected to the outer surface of the covering wall portion 72. The lower portion of the reinforcing wall portion 73 is provided over the entire outer surface of the covering wall portion 72 except for the front end portion.

[0043] (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.

[0044] (Nozzle member) The nozzle member 3 has a nozzle hole 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, a pair of left and right clamping wall portions 33, and a bearing hook 34.

[0045] 1, fitting cylinder portion 31 is fitted into injection cylinder portion 70. In the example shown in the figure, fitting cylinder portion 31 is fitted onto the outside of injection cylinder portion 70 from the front of 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.

[0046] As shown in FIG. 4 , the pair of clamping walls 33 are provided on both sides of the fitting tube 31 in the left-right direction, and are clamped in the left-right direction by the pair of mounting walls 71 while their movement in the up-down direction is restricted. The clamping wall 33 is formed in a plate shape with its front and back surfaces facing the left-right direction. Two recessed portions 33a extending in the front-to-rear direction are formed at an interval in the up-down direction on the outer surface of the clamping wall 33 facing outward in the left-to-right direction. The recessed portions 33a are provided over the entire length of the clamping wall 33 in the front-to-rear direction. Of the two recessed portions 33a, the lower recessed portion 33a is located above the lower end of the clamping wall 33 and is formed in a groove shape, while the upper recessed portion 33a is open upward. The protrusions 71a formed on both vertical ends of the mounting wall 71 are inserted into the two recesses 33a, respectively, thereby restricting the relative vertical movement of the clamping wall 33 and the mounting wall 71. The upper ends of the pair of clamping walls 33 are connected in the left-right direction by a top wall 33b whose front and back surfaces face the vertical direction.

[0047] As shown in FIG. 3 , the bearing hook 34 protrudes downward from the clamping wall 33 and extends in a curved manner rearward, rotatably supporting the rotation shaft 81f of the trigger 81. The inside of the bearing hook 34, into which the rotation shaft 81f is inserted, is closed at the top, front, and bottom and is open at the rear. The bearing hook 34 is provided in a central portion in the front-to-rear direction on the lower end surface of the clamping wall 33. The front end of the covering wall 72 is located between the lower end surface of the clamping wall 33 and the rear end edge of the bearing hook 34, and abuts against or is close to the rotation shaft 81f of the trigger 81. The lower end surface of the clamping wall 33 abuts against or is close to the upper end surface of the covering wall 72.

[0048] (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.

[0049] When the trigger portion 81 is pulled and moved rearward against the biasing force of the biasing member 84, the main piston 83 moves rearward, 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.

[0050] 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.

[0051] 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. 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, and the introduction port 82a is opened to the outside.

[0052] Thereafter, when the trigger portion 81 is released, the trigger portion 81 moves forward in its restoration state due to the elastic restoring force (biasing force) of the biasing member 84, and accordingly the main piston 83 connected to the trigger portion 81 also moves forward in its restoration state within the main cylinder 82. As a result, the pressure within the main cylinder 82 is reduced to a level lower than the pressure within the container body A, and the ball valve 90 rises while the storage valve 91 remains closed. Therefore, the liquid within 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. Here, 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.

[0053] 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.

[0054] As described above, according to the trigger-type liquid ejector 1 of this embodiment, the outer surfaces facing outward in the left-right direction of the mounting wall portion 71 and the covering wall portion 72 are connected via the reinforcing wall portion 73, so that when an unexpected external force is applied forward to the trigger portion 81 and the trigger portion 81 attempts to swing forward around the rotation axis 81f, this external force is transmitted to the mounting wall portion 71 of the ejector main body 2 via the bearing hook 34 and the clamping wall portion 33 of the nozzle member 3, and even if the mounting wall portion 71 attempts to displace upward relative to the covering wall portion 72, this displacement is restricted by the reinforcing wall portion 73. Therefore, even if an unexpected external force is applied to the trigger portion 81 in the forward direction, the reinforcing wall portion 73 maintains the relative positions of the mounting wall portion 71 and the covering wall portion 72, making it possible to prevent the trigger portion 81 from swinging excessively forward around the rotation axis 81f, and preventing the connecting protrusion 81g from coming off the connecting hole 83b and the trigger portion 81 from coming off the front end portion of the main piston 83. As a result, in a trigger-type liquid sprayer 1 that is provided outside the main cylinder 82 and does not come into contact with the liquid, and that has a spring member 84 with a high spring constant that enables continuous spraying, even if an unexpected external force is applied forward to the trigger part 81, the liquid in the container body A can be prevented from leaking out of the inlet 82a through the outside air introduction passage 2b.

[0055] The front-to-rear size of the mounting wall portion 71 is larger than the front-to-rear size of the covering wall portion 72, and the front end portion of the mounting wall portion 71 is located forward of the front end portion of the covering wall portion 72, so that the pair of mounting wall portions 71 can stably hold the clamping wall portion 33 of the nozzle member 3. Of the reinforcing wall portion 73, the upper portion connected to the outer surface of the mounting wall portion 71 protrudes further forward than the lower portion connected to the outer surface of the covering wall portion 72, thereby reliably preventing the mounting wall portion 71 from displacing upward relative to the covering wall portion 72 due to a forward external force suddenly applied to the trigger portion 81.

[0056] Since the lower end of the connecting tube portion 20 and the upper end of the main cylinder tube portion 110 are connected via the connecting wall 101, when an unexpected external force is applied forward to the trigger portion 81 and the trigger portion 81 attempts to swing forward around the rotation axis 81f, this external force is transmitted via the bearing hook 34 and clamping wall portion 33 of the nozzle member 3 to the mounting wall portion 71 of the ejector main body 2, the injection tube portion 70, the storage cylinder 40, and the connecting tube portion 20, and even if the connecting tube portion 20 etc. attempts to displace upward relative to the main cylinder tube portion 110, this displacement is restricted by the connecting wall 101. Therefore, even if an unexpected external force is applied to the trigger portion 81 in the forward direction, the relative positions of the connecting tube portion 20 and the main cylinder tube portion 110 are maintained by the connecting wall 101, making it possible to restrict the trigger portion 81 from swinging excessively forward around the rotation axis 81f, and reliably preventing the trigger portion 81 from coming off the front end portion of the main piston 83.

[0057] A reinforcing rib 102 is provided that is integrally formed with the storage cylinder 40 and the vertical supply tube portion 10 so as to connect the rear of the storage cylinder 40 and the vertical supply tube portion 10 together. Therefore, when an unexpected external force is applied forward to the trigger portion 81 and the trigger portion 81 attempts to swing forward around the rotation axis 81f, this external force is transmitted via the bearing hook 34 and clamping wall portion 33 of the nozzle member 3 to the mounting wall portion 71 of the ejector main body 2, the injection tube portion 70, and the storage cylinder 40. Even if the storage cylinder 40 attempts to tilt so that its rear portion is displaced downward, this tilt is restricted by the reinforcing rib 102. Therefore, even if an unexpected external force is applied to the trigger portion 81 in the forward direction, the reinforcing rib 102 prevents the storage cylinder 40 from tilting, making it possible to restrict the trigger portion 81 from swinging excessively forward around the rotation axis 81f, and reliably preventing the trigger portion 81 from coming off the front end of the main piston 83.

[0058] 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.

[0059] For example, the ejector body 2 may not include the side wall portion 135, the connecting wall 101, and the reinforcing rib 102.

[0060] 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.

[0061] 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 swingable rearward about a rotation axis in a forward biased state, the trigger portion swinging rearward to cause the liquid to flow from inside the vertical supply tube portion toward the ejection hole; 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 swing 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 biased forward as liquid is supplied into the storage cylinder; an injection tube portion extending forward from the storage cylinder and into which the liquid that has passed through the storage cylinder is supplied; a pair of mounting walls provided on both sides of the injection tube portion in a left-right direction perpendicular to the front-rear direction and the up-down direction; a covering wall portion provided below each of the pair of mounting walls and extending in the front-rear direction; Equipped with The trigger mechanism includes: a main cylinder formed in a cylindrical shape with a bottom that opens forward and has a closed rear end opening, and that communicates 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, protruding forward from the sliding portion toward the outside of the main cylinder, and having a front end portion connected to the trigger portion; a cylindrical biasing member into which a portion of the main piston located between the sliding portion and the trigger portion is inserted, and which biases the trigger portion forward; a connecting protrusion formed on either the front end of the main piston or the trigger portion is inserted into a connecting hole formed on the other of the front end of the main piston and the trigger portion, thereby connecting the front end of the main piston to the trigger 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 nozzle member is a fitting cylinder portion fitted to the injection cylinder portion; a pair of clamping walls provided on both sides of the fitting tube portion in a left-right direction and clamped in the left-right direction by the pair of mounting walls in a state in which vertical movement is restricted; a bearing hook that protrudes downward from the clamping wall portion and extends in a curved manner rearward, and rotatably supports the rotation shaft of the trigger portion, The front end of the covering wall portion is located between the lower end surface of the clamping wall portion and the rear end edge of the bearing hook, and is in contact with or close to the rotation axis of the trigger portion, A trigger-type liquid ejector, wherein outer surfaces of the mounting wall portion and the covering wall portion facing outward in the left-right direction are connected via a reinforcing wall portion. <2> a front-rear dimension of the mounting wall portion is greater than a front-rear dimension of the covering wall portion, and a front end portion of the mounting wall portion is located forward of a front end portion of the covering wall portion; an upper portion of the reinforcing wall portion connected to the outer surface of the mounting wall portion protrudes forward more than a lower portion of the reinforcing wall portion connected to the outer surface of the covering wall portion; <1> The trigger-type liquid ejector according to claim 1. <3> The vertical supply tube portion has a main cylinder cylindrical portion that protrudes forward and opens forward; a connecting cylindrical portion that protrudes forward and is disposed above the main cylinder cylindrical portion, and that communicates with the vertical supply cylindrical portion and the storage cylinder; The main cylinder is fitted into the main cylinder cylindrical portion, The storage cylinder is disposed above the connecting tube portion and straddles the vertical supply tube portion in the front-rear direction, The lower end of the connecting cylindrical portion and the upper end of the main cylinder cylindrical portion are connected via a connecting wall. <1> or <2> The trigger-type liquid ejector according to claim 1. <4> The storage cylinder straddles the vertical supply tube portion in the front-rear direction, A reinforcing rib is provided integrally with the storage cylinder and the vertical supply cylindrical portion so as to integrally connect a rear portion of the storage cylinder protruding rearward from the vertical supply cylindrical portion and the vertical supply cylindrical portion. <1> from <3> 10. A trigger-type liquid ejector according to any one of the preceding claims. [Explanation of symbols]

[0062] 1 trigger-type liquid jet 2 Squirt body 2b Outside air intake passage 3 Nozzle member 4 Spout hole 10 Vertical supply tube 20 Connecting tube 31 Fitting cylinder 33 Clamping wall part 34 Bearing hook 40 Storage cylinder 50 Reservoir Plunger 70 Injection cylinder part 71 Mounting wall 72 Covered wall section 73 Reinforced wall 80 Trigger mechanism 81 Trigger section 81f Rotation axis 81g connecting protrusion 82 Main cylinder 82a entrance 83 Main piston 83a Sliding part 83b Connection hole 84 biasing member 101 Connecting Wall 102 Reinforcing rib 110 Main cylinder barrel 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 swingable rearward about a rotation axis in a forward biased state, the trigger portion swinging rearward to cause the liquid to flow from inside the vertical supply tube portion toward the ejection hole; 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 swing 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 biased forward as liquid is supplied into the storage cylinder; an injection tube portion extending forward from the storage cylinder and into which the liquid that has passed through the storage cylinder is supplied; a pair of mounting walls provided on both sides of the injection tube portion in a left-right direction perpendicular to the front-rear direction and the up-down direction; a covering wall portion provided below each of the pair of mounting walls and extending in the front-rear direction; Equipped with The trigger mechanism comprises: a main cylinder formed in a cylindrical shape with a bottom that opens forward and has a closed rear end opening, and that communicates 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, protruding forward from the sliding portion toward the outside of the main cylinder, and having a front end connected to the trigger portion; a cylindrical biasing member into which a portion of the main piston located between the sliding portion and the trigger portion is inserted, and which biases the trigger portion forward; a connecting protrusion formed on either the front end of the main piston or the trigger portion is inserted into a connecting hole formed on the other of the front end of the main piston and the trigger portion, thereby connecting the front end of the main piston to the trigger 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 nozzle member is a fitting cylinder portion fitted to the injection cylinder portion; a pair of clamping walls provided on both sides of the fitting tube portion in a left-right direction and clamped in the left-right direction by the pair of mounting walls in a state in which vertical movement is restricted; a bearing hook that protrudes downward from the clamping wall portion and extends in a curved manner rearward, and rotatably supports the rotation shaft of the trigger portion, The front end of the covering wall portion is located between the lower end surface of the clamping wall portion and the rear end edge of the bearing hook, and is in contact with or close to the rotation axis of the trigger portion, A trigger-type liquid ejector, wherein outer surfaces of the mounting wall portion and the covering wall portion facing outward in the left-right direction are connected via a reinforcing wall portion.

2. a front-rear dimension of the mounting wall portion is greater than a front-rear dimension of the covering wall portion, and a front end portion of the mounting wall portion is located forward of a front end portion of the covering wall portion; 2. The trigger-type liquid ejector according to claim 1, wherein an upper portion of the reinforcing wall portion connected to the outer surface of the mounting wall portion protrudes forward more than a lower portion connected to the outer surface of the covering wall portion.

3. The vertical supply tube portion has a main cylinder cylindrical portion that protrudes forward and opens forward; a connecting cylindrical portion that protrudes forward and is disposed above the main cylinder cylindrical portion, and that communicates with the vertical supply cylindrical portion and the storage cylinder; The main cylinder is fitted into the main cylinder cylindrical portion, The storage cylinder is disposed above the connecting tube portion and straddles the vertical supply tube portion in the front-rear direction, 3. The trigger-type liquid ejector according to claim 1, wherein a lower end of the connecting cylindrical portion and an upper end of the main cylinder cylindrical portion are connected via a connecting wall.

4. The storage cylinder straddles the vertical supply tube portion in the front-rear direction, 3. A trigger-type liquid ejector as described in claim 1 or 2, wherein a reinforcing rib is formed integrally with the storage cylinder and the vertical supply tube portion so as to connect the rear portion of the storage cylinder, which protrudes rearward from the vertical supply tube portion, to the vertical supply tube portion.

Images