JP7653899B2 - Trigger-type liquid ejector - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act (1) Shipment and sales of products Location of shipment: Kao Corporation, Wakayama Plant (1334 Minato, Wakayama City, Wakayama Prefecture) Shipment date: August 16, 2021 / Sales date: September 1, 2021 (2) Kao Corporation website Website address: https://www.kao.com/jp/corporate/news/products/2021/20210824-001/ https://www.kao.com/content/dam/sites/kao/www-kao-com/jp/ja/corporate/news/2021/pdf/20210824-001-01. pdf Date of website publication August 24, 2021

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

Trigger-type liquid ejectors are known that suck up liquid from a container by operating a trigger portion and eject the liquid through an ejection hole.
As this type of trigger type liquid ejector, for example, a trigger type liquid ejector as shown in Patent Document 1 below is known.
The trigger type liquid ejector comprises a ejector body that is attached to a container body that contains liquid, a nozzle member that is disposed on the front side of the ejector body and has an ejection hole that ejects the liquid forward, and a cover body that covers the ejector body and the nozzle member. The ejector body includes a vertical supply tube that extends in the vertical direction and sucks up the liquid in the container body, and a trigger mechanism that has a trigger portion that is disposed in front of the vertical supply tube so as to be movable backward in a forward biased state, and causes the liquid to flow from inside the vertical supply tube toward the ejection hole side by the rearward movement of the trigger portion. The trigger mechanism includes a piston that moves back and forth with the movement of the trigger portion, and a cylinder whose interior is pressurized and depressurized with the movement of the piston and whose interior is connected to the inside of the vertical supply tube.

JP 2017-213497 A

However, in the conventional trigger-type liquid ejector, when the internal pressure of the container body rises due to a change in the environmental temperature, the inside of the container body may communicate with the inside of the cylinder through the vertical supply tube section, and the piston in the cylinder may advance unintentionally. In this case, there is a risk that the piston may come off the cylinder, causing liquid leakage, etc.

The present invention was made in consideration of the above-mentioned circumstances, and aims to restrict unintended forward movement of the piston.

<1> A trigger-type liquid ejector according to one aspect of the present invention comprises a ejector body attached to a container body containing liquid, a nozzle member disposed on the front side of the ejector body and having an ejection hole formed therein for ejecting liquid forward, and a cover body covering the ejector body and the nozzle member, the ejector body extending in the vertical direction and having a vertical supply tube section that sucks up liquid in the container body, and a trigger section disposed in front of the vertical supply tube section so as to be movable rearward in a forward biased state, the trigger mechanism causing liquid to flow from within the vertical supply tube section towards the ejection hole side by the rearward movement of the trigger section, the trigger mechanism comprising a piston that moves back and forth with the movement of the trigger section, and a cylinder whose interior is pressurized and depressurized with the movement of the piston and whose interior is connected to the inside of the vertical supply tube section, the trigger section is supported so as to be swingable in the front and rear directions around an upper end of the trigger section, and the cover body is provided with a regulating section that engages with the trigger section from below and regulates the forward swing of the trigger section.

The restricting portion engages with the trigger portion to restrict the forward swing of the trigger portion. Therefore, even if the internal pressure of the cylinder rises and the piston attempts to move forward, the trigger portion engages with the restricting portion, restricting the forward movement of the piston.

<2> In the trigger-type liquid ejector according to <1> above, the trigger portion may have a rearward protruding portion that protrudes rearward and engages with the regulating portion, and the regulating portion may have a wall portion that protrudes upward from the regulating portion and sandwiches the rearward protruding portion between the regulating portion and the cover body.

The wall portion sandwiches the rearward protruding portion between itself and the cover body. Therefore, even if the rearward protruding portion attempts to shift left or right relative to the restricting portion, this shift can be restricted by the wall portion. This ensures that the forward movement of the piston can be restricted.

<3> In the trigger-type liquid ejector according to <1> or <2> above, the trigger mechanism may be configured to include a metal coil spring that biases the piston forward.

The trigger mechanism is equipped with a metal coil spring that urges the piston forward. The urging force of the metal coil spring is stronger than, for example, a resin urging member. Therefore, when a metal coil spring is used as the member that urges the piston forward, the piston is more likely to move forward when the internal pressure of the cylinder increases. Therefore, the effect of restricting the forward movement of the piston by the restricting portion is significantly achieved.

<4> In the trigger-type liquid ejector according to any one of <1> to <3> above, the ejector body may be configured to include a storage cylinder into which liquid that has passed through the vertical supply tube portion from the cylinder is supplied by the rearward movement of the trigger portion, a storage plunger that is arranged in the storage cylinder so as to be movable in the axial direction along its central axis, and that moves toward one side in the axial direction and is biased toward the other side as liquid is supplied into the storage cylinder, a first check valve that blocks communication between the inside of the container body and the inside of the cylinder through the vertical supply tube portion when the inside of the cylinder is pressurized, and allows communication between the inside of the container body and the inside of the cylinder through the vertical supply tube portion when the inside of the cylinder is depressurized, and a second check valve that allows communication between the inside of the storage cylinder and the inside of the cylinder through the vertical supply tube portion when the inside of the cylinder is pressurized, and blocks communication between the inside of the storage cylinder and the inside of the cylinder through the vertical supply tube portion when the inside of the cylinder is depressurized.

In this case, continuous liquid ejection can be achieved.

The present invention makes it possible to prevent the piston from moving forward unintentionally.

1 is a vertical cross-sectional view of a trigger type liquid ejector according to an embodiment of the present invention; FIG. 2 is an enlarged vertical cross-sectional view of the trigger type liquid ejector shown in FIG. 1 . 2 is a diagram showing the trigger-type liquid ejector shown in FIG. 1 , showing a state in which a restricting portion and a rearward protruding portion are viewed from the inner surface side of a side wall of a cover body; FIG. 3 is a vertical cross-sectional view showing a state in which the trigger of the trigger-type liquid ejector shown in FIG. 2 is pulled rearward. FIG.

Below, an embodiment of a trigger-type liquid ejector according to the present invention will be described with reference to Figures 1 to 4. In this embodiment, a ejection container in which a trigger-type liquid ejector is attached to a container body will be described as an example.

(General configuration)
As shown in Figures 1 and 2, the trigger-type liquid ejector 1 of this embodiment comprises a ejector body 2 that is attached to a container body A that contains liquid, a nozzle member 3 that is attached to the ejector body 2 and has an ejection hole 4 for ejecting the liquid, and a cover body 100 that covers the ejector body 2 and the nozzle member 3.
Unless otherwise specified, each component part of the trigger type liquid ejector 1 is a molded product made of synthetic resin.

The ejector body 2 mainly comprises a vertical supply tube section 10, an attachment cap 14, a storage cylinder 90, an injection tube section 11, a trigger mechanism 50, a storage plunger 80, a biasing member 81, a ball valve 19 (first check valve), and a storage valve 20 (second check valve).

In this embodiment, the central axis of the vertical supply tube section 10 is the axis O1, the side of the container body A along this axis O1 is called the lower side, and the opposite side is called the upper side, and the direction along the axis O1 is called the up-down direction. In addition, in a plan view seen from the up-down direction, the direction that intersects with the axis O1 is called the front-rear direction, and the direction perpendicular to both the up-down direction and the front-rear direction is called the left-right direction.

Furthermore, in this embodiment, the central axis of the storage cylinder 90 is the axis O2. In this embodiment, the axis O2 extends in the front-rear direction. In this embodiment, the front-rear direction corresponds to the axial direction along the central axis of the storage cylinder 90. In this embodiment, the rear corresponds to one side of the axial direction along the central axis of the storage cylinder 90, and the front corresponds to the other side of the axial direction along the central axis of the storage cylinder 90. However, the axial direction along the axis O2 does not have to coincide with the front-rear direction.

The vertical supply tube portion 10 extends in the vertical direction and sucks up the liquid in the container body A. The vertical supply tube portion 10 is attached to the container body A by an attachment cap 14. The upper part of a pipe 15 that extends in the vertical direction and sucks up the liquid from the container body A is fitted into the vertical supply tube portion 10.
A connecting tube portion 30 extending forward is provided at the upper end portion of the vertical supply tube portion 10. The inside of the connecting tube portion 30 is in communication with the inside of the vertical supply tube portion 10.

A cylinder tube portion 40 is provided below the connection tube portion 30 and above the mounting cap 14. The cylinder tube portion 40 protrudes forward from the vertical supply tube portion 10 and opens forward. A main cylinder 53 is fitted into the cylinder tube portion 40. The main cylinder 53 is formed in a bottomed tube shape that opens forward and is closed at the rear. The inside of the main cylinder 53 is connected to the inside of the vertical supply tube portion 10.

The storage cylinder 90 is disposed above the vertical supply tube section 10 and the connecting tube section 30. In this embodiment, the lower end of the storage cylinder 90 is integrally formed with the upper end of the vertical supply tube section 10 and the upper end of the connecting tube section 30. Liquid that has passed through the vertical supply tube section 10 and the connecting tube section 30 is supplied to the inside of the storage cylinder 90 (storage space 90a described below) by the rearward swinging of the trigger section 51.

The injection tube portion 11 extends forward from the storage cylinder 90. The injection tube portion 11 communicates with the interior of the vertical supply tube portion 10 through the interior of the storage cylinder 90 (storage space 90a) and the interior of the connection tube portion 30. The injection tube portion 11 guides the liquid that has passed through the interior of the vertical supply tube portion 10, the interior of the connection tube portion 30, and the interior of the storage cylinder 90 (storage space 90a) to the ejection hole 4.
A nozzle member 3 is fitted from the front onto the injection tube portion 11. The nozzle member 3 is attached to the ejector body 2. The nozzle member 3 is formed with an ejection hole 4 that opens forward and ejects liquid forward.

The storage plunger 80 is disposed in the storage cylinder 90 so as to be movable in the front-rear direction along the axis O2. The storage plunger 80 slides tightly in the storage cylinder 90 in the front-rear direction.
At the forwardmost position, the storage plunger 80 blocks communication between the interior of the vertical supply tube section 10 and the ejection hole 4 (inside the injection tube section 11). When the storage plunger 80 moves rearward from the forwardmost position, the storage plunger 80 connects the interior of the vertical supply tube section 10 and the ejection hole 4 (inside the injection tube section 11). In the storage cylinder 90, the space located forward of the storage plunger 80 functions as a storage space 90a.

The storage space 90a stores liquid that has passed through the vertical supply tube section 10. The storage space 90a expands as the storage plunger 80 moves rearward due to the supply of liquid. The storage plunger 80 moves rearward as liquid is supplied into the storage cylinder 90. The storage space 90a is connected to the vertical supply tube section 10 through the connecting tube section 30. The storage space 90a can also communicate with the inside of the injection tube section 11. When the storage plunger 80 is in the forwardmost position, the storage space 90a is not connected to the inside of the injection tube section 11. When the storage plunger 80 retracts from the forwardmost position, the storage space 90a communicates with the inside of the injection tube section 11.

The biasing member 81 biases the storage plunger 80 forward. The biasing member 81 is disposed behind the storage plunger 80 within the storage cylinder 90. In the initial state before the user operates the trigger portion 51, the biasing member 81 biases the storage plunger 80 forward, so that the storage plunger 80 is positioned at the forward-most position. The biasing member 81 is a metal coil spring disposed coaxially with the axis O2. However, for example, a resin spring or other elastic members may be used as the biasing member 81.

The liquid is pressurized in the storage space 90a of the storage cylinder 90 until the storage plunger 80 moves rearward. When the liquid pressure in the storage space 90a reaches a predetermined value, the storage plunger 80 moves rearward against the biasing member 81. This makes it possible to supply the liquid in the storage space 90a to the ejection hole 4 side. The storage plunger 80 functions as a pressure accumulator valve.

The trigger mechanism 50 includes a trigger portion 51, the main cylinder 53, a main piston 52 (piston), and a coil spring (biasing member) 54. The trigger mechanism 50 is capable of circulating liquid from inside the vertical supply tube portion 10 toward the nozzle hole 4 by the rearward swinging of the trigger portion 51.

The trigger portion 51 is disposed in front of the vertical supply tube portion 10 so as to be movable rearward in a forward biased state. The trigger portion 51 is formed to extend in the vertical direction and is disposed below the injection tube portion 11. The upper end portion of the trigger portion 51 is journaled to the nozzle member 3 so as to be swingable in the front-rear direction. The trigger portion 51 extends downward from the nozzle member 3. The lower end portion of the trigger portion 51 is disposed in front of the main cylinder 53.

In the illustrated example, a stopper T is removably provided in the gap between the trigger portion 51 and the main cylinder 53 in the front-rear direction. The stopper T restricts the rearward swing of the trigger portion 51 by abutting against both the trigger portion 51 and the main cylinder 53. The stopper T is not necessarily required.

The main piston 52 is disposed inside the main cylinder 53 so that it can move in the front-rear direction. The main piston 52 can move in the front-rear direction in conjunction with the swinging of the trigger portion 51. The inside of the main cylinder 53 is pressurized and depressurized as the main piston 52 moves in the front-rear direction. The main piston 52 is formed in a topped cylindrical shape that is open at the rear and closed at the front.

The main piston 52, together with the trigger part 51, is biased forward by the biasing force of the coil spring 54. As the trigger part 51 swings backward, the main piston 52 moves backward and is pushed into the main cylinder 53. When the trigger part 51 is in the forward-most swing position, the main piston 52 is correspondingly located in the forward-most position.

The coil spring (biasing member) 54 is made of metal. The coil spring 54 is disposed coaxially with the main piston 52 and the main cylinder 53, and biases the trigger portion 51 forward via the main piston 52. The coil spring 54 is disposed between the bottom wall of the main piston 52 and the top wall of the main cylinder 53. Note that the material of the coil spring 54 is not limited to metal, and for example, a resin spring or the like may be used.

The ball valve 19 and the storage valve 20 are provided within the vertical supply tube portion 10 .
The ball valve 19 serves as a check valve that blocks communication between the inside of the container body A and the inside of the main cylinder 53 through the vertical supply tube section 10 when pressure is applied inside the main cylinder 53, and allows communication between the inside of the container body A and the inside of the main cylinder 53 through the vertical supply tube section 10 by displacing upward when pressure is reduced inside the main cylinder 53.

A storage valve 20 is disposed above the ball valve 19. The storage valve 20 is a check valve that allows liquid to be supplied from the vertical supply tube section 10 to the storage cylinder 90, and prevents liquid from flowing out of the storage cylinder 90 into the vertical supply tube section 10.

The cover body 100 is formed to cover the entire vertical supply tube section 10 except for the lower end, the entire injection tube section 11, and the entire storage cylinder 90 from at least both left and right sides and from above. The cover body 100 has a pair of side walls 101, a top wall 102, a rear wall 103, and a bottom wall 104.

The pair of side walls 101 sandwich the ejector body 2 and the nozzle member 3 in the left-right direction. A gap is provided between the inner surface of the side wall 101 (the surface of the side wall 101 facing the ejector body 2 in the left-right direction) and the ejector body 2 in the left-right direction.
The top wall 102 covers the ejector body 2 and the nozzle member 3 from above. The top wall 102 connects the upper ends of the pair of side walls 101. The top wall 102 is supported from below by the injection tube portion 11 (ejector body 2).

The rear wall 103 covers the ejector body 2 from the rear. The rear wall 103 connects the rear ends of the pair of side walls 101 to each other.
The bottom wall 104 connects the lower ends of the pair of side walls 101. The bottom wall 104 connects the portions of the lower ends of the pair of side walls 101 that are located rearward of the center in the front-to-rear direction. The portions of the lower ends of the pair of side walls 101 that are located forward of the center in the front-to-rear direction are not connected.

The cover body 100 is open forward and downward. The cover body 100 is open forward from between the front ends of the pair of side walls 101. The cover body 100 is open downward from between the lower ends of the pair of side walls 101, between the portions that are not connected by the bottom wall 104.

The cover body 100 is attached from the rear to the combined body in which the ejector body 2 and the nozzle member 3 are combined. When the cover body 100 is attached to the combined body, the cover body 100 is moved forward while positioned rearward relative to the combined body. Then, the combined body passes through an opening in the cover body 100 facing forward, and is housed within the cover body 100.

The cover body 100 is provided with an engagement portion 105. The engagement portion 105 prevents the cover body 100 from coming off the combined body (the ejector main body 2 in the illustrated example). In the illustrated example, the engagement portion 105 is provided on the bottom wall 104. The engagement portion 105 engages with the vertical supply tube portion 10 from the rear. The engagement portion 105 prevents the cover body 100 from moving rearward relative to the combined body.

(Function of trigger-type liquid ejector)
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 by operating the trigger portion 51 multiple times, liquid is filled into each portion of the trigger type liquid ejector 1, and the liquid can be sucked up into the vertical supply tube portion 10.

After removing the stopper T, the user operates the trigger portion 51 by pulling it backward against the biasing force of the coil spring 54. Then, as shown in FIG. 4, the main piston 52 moves backward from the forwardmost position, and the inside of the main cylinder 53 is pressurized. This causes the liquid in the main cylinder 53 to be supplied to the vertical supply tube portion 10. Then, the liquid supplied to the vertical supply tube portion 10 presses the ball valve 19 downward and pushes up the storage valve 20.

This allows the liquid in the vertical supply tube section 10 to be supplied to the storage space 90a of the storage cylinder 90 through the connecting tube section 30, and the storage space 90a can be pressurized. Therefore, as the storage space 90a is pressurized, the storage plunger 80 can be moved rearward from its most forward position against the biasing force of the biasing member 81, and the liquid can be stored (filled) in the storage space 90a.

By the rearward movement of the storage plunger 80, the liquid in the storage space 90a, whose pressure has increased, can be guided to the ejection hole 4 through the inside of the injection tube portion 11. Therefore, the liquid can be ejected forward from the ejection hole 4.
As described above, each time the trigger portion 51 is pulled rearward, liquid can be ejected from the ejection hole 4, and the storage plunger 80 can be moved rearward to store liquid in the storage space 90a.

Thereafter, when the trigger portion 51 is released, the main piston 52 moves forward in the main cylinder 53 due to the elastic restoring force (biasing force) of the coil spring 54, and the trigger portion 51 also moves forward in response to this. This reduces the pressure inside the main cylinder 53 to a pressure lower than the pressure inside the container body A, so that the ball valve 19 can be raised while the storage valve 20 remains closed. This allows the liquid inside the container body A to be sucked up into the vertical supply tube portion 10 and introduced into the main cylinder 53.
This allows preparation for the next eruption.

In this embodiment, a metallic coil spring 54 biases the main piston 52. The metallic coil spring 54 has superior durability and resilience (elasticity) compared to resin biasing members and the like. Therefore, by using a metallic coil spring 54 as in this embodiment, the main piston 52 can be quickly returned (advanced) after it retreats as the trigger portion 51 moves. As a result, it becomes possible to continuously send liquid from the main cylinder 53 to the storage space 90a, making it easier to continuously eject the liquid without interruption.

Furthermore, when the operation of the trigger portion 51 toward the rear is stopped, the supply of liquid to the storage space 90a through the vertical supply tube portion 10 and the connecting tube portion 30 stops, but the storage plunger 80 begins to move forward toward the most forward position due to the biasing force of the biasing member 81.
At this time, the outflow of liquid from the storage space 90 a into the vertical supply tube portion 10 is regulated by the storage valve 20 .

This allows the liquid stored in the storage space 90 a to be guided through the inside of the injection tube portion 11 to the ejection hole 4 , and the liquid can be continuously ejected forward through the ejection hole 4 .
In this way, liquid can be ejected not only when the trigger portion 51 is pulled rearward, but also when the trigger portion 51 is not operated, and liquid can be ejected continuously.

(Regulation Department)
1, the cover body 100 is provided with a restricting portion 201 (flange portion). The restricting portion 201 engages with the trigger portion 51 from below. The restricting portion 201 restricts the forward swinging of the trigger portion 51.
The restricting portion 201 is provided on the inner surface of the cover body 100. The restricting portion 201 is provided on the inner surface of the side wall 101.

Two restricting parts 201 are provided on either side of the cylinder 202 in the left-right direction. The cylinder 202 is composed of a main cylinder 53 and a cylinder tube part 40. The main cylinder 53 and the cylinder tube part 40 may be molded as a single unit.

Each regulating portion 201 extends linearly in the front-rear direction. Each regulating portion 201 extends over almost the entire length in the front-rear direction relative to the side wall 101. The front end of each regulating portion 201 is located rearward of the front end of the cylinder 202 (cylinder tubular portion 40) and forward of the rear end of the cylinder 202. The rear end of each regulating portion 201 is located rearward of the ejector main body 2. Each regulating portion 201 is plate-shaped with the front and back surfaces facing up and down.

The restricting portion 201 is located below the rotating shaft portion 55 and the central axis O3 of the piston. The central axis O3 of the piston is located between the rotating shaft portion 55 and the restricting portion 201 in the vertical direction.

Each regulating portion 201 is provided with a wall portion 203. The wall portion 203 protrudes upward from the regulating portion 201. The wall portion 203 is disposed at the outer end of the regulating portion 201 in the left-right direction. The wall portion 203 is disposed with a gap between it and the inner surface of the side wall 101. The wall portion 203 is plate-shaped with the front and back surfaces facing the left-right direction. The wall portion 203 extends over the entire length of the regulating portion 201 in the front-rear direction.

As shown in FIG. 2, the trigger unit 51 includes a main plate member 51a and a side plate member 51b. The front and back surfaces of the main plate member 51a face the front-rear direction. The main plate member 51a extends in the up-down direction. In the illustrated example, the main plate member 51a is curved concavely toward the rear in a side view seen from the left-right direction.

A pair of side plate members 51b are provided. Each side plate member 51b extends rearward from the left and right side edges of the main plate member 51a. The front and back surfaces of each side plate member 51b face in the left-right direction. In the illustrated example, each side plate member 51b has an inverted L shape that is convex rearward when viewed from the left-right direction. The upper end of each side plate member 51b is supported by a rotating shaft portion 55. This allows the trigger portion 51 to be supported so that it can swing in the front-rear direction around the rotating shaft portion 55.

Each side plate member 51b is provided with a rear protrusion 51c. The rear protrusion 51c protrudes rearward from the vertical middle portion of the rear end of the side plate member 51b. As shown in FIG. 3, the rear protrusion 51c becomes smaller in the vertical direction toward the rear. The rear protrusion 51c has a triangular shape that is convex toward the rear. The rear end of the rear protrusion 51c is disposed in the gap between the side wall 101 and the wall surface portion 203. The wall surface portion 203 sandwiches the rear protrusion 51c between the side wall 101 and the rear protrusion 51c. The lower end of the rear protrusion 51c is supported from below by the restricting portion 201. The rear protrusion 51c engages with the restricting portion 201.

In the illustrated example, a notch 51d is provided at the rear end of the rear protrusion 51c. The notch 51d is provided at the lower end of the rear end of the rear protrusion 51c. The notch 51d is recessed upward at the rear end of the rear protrusion 51c. In this embodiment, the inner surface of the notch 51d in the rear protrusion 51c engages with the restricting portion 201.

The rear protruding portion 51c is a plate-like portion facing the left-right direction. The front and back surfaces of the rear protruding portion 51c are flush with the front and back surfaces of the side plate member 51b. A part of the rear protruding portion 51c may be a thick portion that is thicker than the other part of the rear protruding portion 51c. It is preferable that such a thick portion is a part of the rear protruding portion 51c that engages with the restricting portion 201 (the rear end and the lower end of the rear protruding portion 51c).
When the main piston 52 is in the forwardmost position, the lower end of the rearward protruding portion 51 c is engaged with the restricting portion 201 while extending parallel to the restricting portion 201 .

As described above, according to the trigger-type liquid ejector 1 of this embodiment, the restricting portion 201 engages with the trigger portion 51 to restrict the forward swing of the trigger portion 51. Therefore, even if the internal pressure of the cylinder 202 rises and the main piston 52 attempts to move forward, the trigger portion 51 engages with the restricting portion 201, thereby restricting the forward movement of the main piston 52.

The wall portion 203 sandwiches the rearward protruding portion 51c between itself and the side wall 101. Therefore, even if the rearward protruding portion 51c attempts to shift left or right relative to the restricting portion 201, this shift can be restricted by the wall portion 203. This ensures that the forward movement of the main piston 52 can be restricted.

The trigger mechanism 50 is equipped with a metal coil spring 54 that biases the main piston 52 forward. The biasing force of the metal coil spring 54 is stronger than, for example, a resin biasing member 81. Therefore, when the metal coil spring 54 is used as the member that biases the main piston 52 forward, the main piston 52 is more likely to move forward when the internal pressure of the cylinder 202 increases. Therefore, the effect of restricting the forward movement of the main piston 52 by the restricting portion 201 is significantly effective.

The central axis O3 of the main piston 52 is located between the rotating shaft 55 and the restricting portion 201 in the vertical direction. Therefore, the cover body 100 can effectively support the load of the trigger portion 51 at two points (the rotating shaft 55 and the restricting portion 201) that are separated in the vertical direction.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

The reservoir cylinder 90 and the reservoir plunger 80 may be omitted. The trigger type liquid ejector 1 does not have to be designed for continuous ejection.
The central axis O3 of the main piston 52 does not have to be located between the rotating shaft portion 55 and the restricting portion 201 in the up-down direction. The central axis O3 of the main piston 52 may be located below the rotating shaft portion 55 and the restricting portion 201.
The trigger portion 51 does not have to include the rear protruding portion 51c. The side plate member 51b or the main plate member 51a may be engaged with the restricting portion 201.

In addition, the components in the above embodiment may be replaced with well-known components as appropriate without departing from the spirit of the present invention, and the above-mentioned modifications may be combined as appropriate.

1 Trigger-type liquid ejector 2 Ejector body 3 Nozzle member 4 Ejection hole 10 Vertical supply tube portion 50 Trigger mechanism 51 Trigger portion 51c Rearward protruding portion 52 Main piston (piston)
55 Rotating shaft portion 80 Storage plunger 90 Storage cylinder 100 Cover body 201 Restriction portion 202 Cylinder 203 Wall portion A Container body O2 Axis

Claims (4)

An ejector body that is attached to a container that contains a liquid;
a nozzle member disposed on a front side of the ejector body and having an ejection hole formed therein for ejecting liquid forward;
a cover body that covers the ejector body and the nozzle member,
The ejector body includes:
A vertical supply tube portion that extends in a vertical direction and sucks up the liquid in 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 in a forward biased state, the trigger portion moving rearward to cause liquid to flow from inside the vertical supply tube portion toward the nozzle hole side,
The trigger mechanism includes:
A piston that moves back and forth with the movement of the trigger portion;
a cylinder whose inside is pressurized and depressurized in accordance with the movement of the piston and whose inside is in communication with the inside of the vertical supply tube portion;
The trigger portion is supported so as to be swingable in the front-rear direction around an upper end portion of the trigger portion,
The trigger type liquid ejector, wherein the cover body is provided with a restricting portion that engages with the trigger portion from below and restricts the forward swing of the trigger portion. The trigger portion includes a rear protruding portion that protrudes rearward and engages with the restricting portion,
The trigger-type liquid ejector according to claim 1 , wherein the restricting portion is provided with a wall portion that protrudes upward from the restricting portion and that sandwiches the rearward protruding portion between the restricting portion and the cover body. The trigger-type liquid ejector according to claim 1 or 2, wherein the trigger mechanism includes a metal coil spring that biases the piston forward. The ejector body includes:
a storage cylinder into which the liquid that has passed through the vertical supply tube portion is supplied from the cylinder by the rearward movement of the trigger portion;
a storage plunger disposed in the storage cylinder so as to be movable in an axial direction along a central axis thereof, and which moves toward one side in the axial direction and is biased toward the other side as liquid is supplied into the storage cylinder;
a first check valve that blocks communication between the inside of the container body and the inside of the cylinder through the vertical supply tube portion when the inside of the cylinder is pressurized, and allows communication between the inside of the container body and the inside of the cylinder through the vertical supply tube portion when the inside of the cylinder is depressurized;
4. The trigger-type liquid ejector according to claim 1, further comprising a second check valve that allows communication between the interior of the storage cylinder and the interior of the cylinder through the vertical supply tube portion when the pressure in the cylinder is increased, and blocks communication between the interior of the storage cylinder and the interior of the cylinder through the vertical supply tube portion when the pressure in the cylinder is decreased.

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