CN118176064A

CN118176064A - Trigger type liquid ejector

Info

Publication number: CN118176064A
Application number: CN202280071734.1A
Authority: CN
Inventors: 坂田耕太; 藤原宏太郎; 早川茂
Original assignee: Yoshino Kogyosho Co Ltd
Current assignee: Yoshino Kogyosho Co Ltd
Priority date: 2021-10-29
Filing date: 2022-10-26
Publication date: 2024-06-11
Also published as: JP2023098189A

Abstract

The invention relates to a trigger type liquid ejector (1, 201), wherein the trigger type liquid ejector (1, 201) comprises an ejector main body (2, 202) and a nozzle component (3, 203), the ejector main body (2, 202) comprises a longitudinal supply cylinder part (10, 210), a trigger mechanism (80, 220), a storage cylinder body (40, 240) and a storage plunger (50, 250), and the trigger mechanism (80, 220) comprises a main cylinder body (82, 223), a main piston (83, 222) and a force application component (84, 224).

Description

Trigger type liquid ejector

Technical Field

The present application relates to a trigger type liquid ejector. The present application claims priority based on japanese patent application No. 2021-214794 filed in japan at 12 months of 2021 and japanese patent application No. 2021-177973 filed in japan at 10 months of 2021 and the contents of which are incorporated herein by reference.

Background

A trigger type liquid injector is known which sucks liquid from a container body by operation of a trigger portion and injects the liquid through an injection hole. The trigger type liquid ejector described in patent document 1 below includes: a piston which moves forward and backward with the movement of the trigger portion; a cylinder that pressurizes and depressurizes the interior with movement of the piston and communicates the interior with the inside of the longitudinal supply cylinder; and a biasing member disposed inside the cylinder and biasing the trigger portion forward via the piston.

The trigger type liquid ejector described in patent document 1 includes: a storage cylinder for supplying the liquid passing through the longitudinal supply cylinder to the inside by the trigger moving backward; and an accumulation plunger disposed in the accumulation cylinder, the accumulation plunger being moved toward one side in the axial direction and biased toward the other side in response to supply of the liquid into the accumulation cylinder, the trigger type liquid injector being capable of continuous injection of the liquid.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2021-159841

Disclosure of Invention

Technical problem

In the trigger type liquid sprayer, various kinds of liquid such as a mold remover containing hypochlorite used in a bathroom are continuously sprayed. However, depending on the type of liquid, there are cases where the movement of the piston and/or the operation of the trigger portion become sluggish due to deterioration of the biasing member in contact with the liquid, and cases where the liquid itself is deteriorated due to contact with the biasing member.

In addition, in the conventional trigger type liquid injector, the tip end portion of the piston is brought into contact with the trigger portion so that the piston biased forward by the biasing member does not come off the cylinder. However, the advance of the piston cannot be restricted until the trigger portion is assembled, and if the assembly accuracy of the trigger portion is deviated or deformed, the piston may advance to a position more advanced than the designed forward-most position, and leakage or the like may occur. If the piston is advanced to a position that is advanced more than the designed forward-most position, the piston may not be retracted to the designed rearward-most position or the like when the trigger portion is pulled.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a trigger type liquid injector capable of suppressing contact between a biasing member for biasing a trigger portion and liquid, and continuously injecting the liquid, and capable of restricting advance of a piston without depending on an assembled state of the trigger portion.

Technical proposal

A trigger type liquid ejector according to a first aspect of the present invention includes: an ejector main body attached to a container body containing a liquid; and a nozzle member that is attached to the injector body and that is formed with an injection hole that injects a liquid, the injector body including: a longitudinal supply tube portion that sucks the liquid in the container body; a trigger mechanism having a trigger portion disposed so as to be movable rearward in a state of being biased forward, the trigger mechanism causing liquid to flow from within the longitudinal supply tube portion toward the injection hole side by rearward movement of the trigger portion; an accumulation cylinder for supplying the liquid passing through the longitudinal supply tube portion to the inside by the rearward movement of the trigger portion; and an accumulation plunger disposed in the accumulation cylinder so as to be movable in an axial direction along a central axis of the accumulation cylinder, the accumulation plunger being movable toward one side in the axial direction and biased toward the other side as liquid is supplied into the accumulation cylinder, the trigger mechanism including: a main cylinder body which is opened forward and communicates with the inside of the longitudinal supply cylinder portion rearward; a main piston having a sliding portion disposed in the main cylinder so as to be movable in a front-rear direction, and a protrusion protruding forward from the sliding portion toward the outside of the main cylinder, and having a front end portion connected to the trigger portion; and a biasing member that is inserted into the protrusion of the master piston and biases the trigger portion forward.

According to the trigger type liquid injector of the first aspect of the present invention, the trigger portion is operated to move rearward, so that the liquid can flow from the inside of the longitudinal supply tube portion toward the injection hole side. This allows the liquid to be ejected to the outside through the ejection hole of the nozzle member. Further, the liquid is supplied from the inside of the longitudinal supply tube portion into the accumulation cylinder, and the inside of the accumulation cylinder can be pressurized. Therefore, the accumulation plunger can be pushed toward one side in the axial direction against the other side in the axial direction, and the accumulation plunger can be moved toward one side in the axial direction while ejecting the liquid. Therefore, each time the trigger portion is pulled, the accumulation plunger can be moved to one side in the axial direction, and the liquid can be injected while accumulating (filling) the liquid in the accumulation cylinder. When the operation of the trigger portion is stopped after the liquid is filled into the accumulation cylinder, the supply of the liquid into the accumulation cylinder is stopped by the longitudinal supply tube portion, but the accumulation plunger starts to return to the other side in the axial direction. This allows the liquid filled in the accumulation cylinder to be pushed out from the accumulation cylinder toward the injection hole, and to be injected from the injection hole. Thus, continuous ejection of liquid can be performed.

However, the trigger portion is biased forward by the biasing member. In particular, a protrusion of the main piston, which protrudes outward from the front opening of the main cylinder and has a distal end connected to the trigger portion, is inserted into the biasing member. Therefore, the trigger portion can be biased by disposing the biasing member outside the space surrounded by the main cylinder and the main piston. Thus, the liquid sucked into the main cylinder does not react by coming into liquid contact with the biasing member. Therefore, deterioration of the biasing member, deterioration of the liquid, and the like can be prevented, and the trigger type liquid ejector suitable for continuous ejection of the liquid can be obtained.

A second aspect of the present invention is the trigger type liquid injector according to the first aspect, further comprising a spring seat attached to the front opening of the main cylinder and receiving the rear end of the biasing member.

In this case, the spring seat can be attached to the front opening of the main cylinder, and the biasing member can be disposed between the spring seat and the trigger portion. In addition, the spring seat can restrict the main piston from falling out of the front opening of the main cylinder.

In a third aspect of the present invention, in the trigger type liquid ejector according to the second aspect, the spring seat includes a pair of side wall portions sandwiching the biasing member in a left-right direction.

In this case, the biasing member disposed outside the space surrounded by the main cylinder and the main piston is sandwiched by the pair of left and right side wall portions, so that the biasing member is hard to be seen from the outside, and the designability can be improved. Further, the adhesion of the liquid or the like scattered by the spray to the biasing member can be suppressed by the pair of left and right side wall portions.

A fourth aspect of the present invention is the trigger type liquid ejector according to the second or third aspect, wherein the spring seat includes: an inner cylinder portion inserted into the main cylinder; and a receiving portion formed inside the inner tube portion and receiving a rear end of the urging member.

In this case, the inner cylinder portion of the spring seat is inserted into the main cylinder. Therefore, the installation of the spring seat with respect to the main cylinder body becomes easy. Further, the inner cylinder portion inserted into the main cylinder can restrict the main piston sliding in the main cylinder from falling forward.

A trigger type liquid ejector according to a fifth aspect of the present invention includes: an ejector main body attached to a container body containing a liquid; and a nozzle member which is disposed on the front side of the injector body and which is formed with an injection hole for injecting liquid toward the front, the injector body including: a longitudinal supply tube portion extending in the up-down direction and sucking the liquid in the container body; and a trigger mechanism having a trigger portion disposed in front of the longitudinal supply tube portion so as to be movable rearward in a state of being biased forward, the trigger mechanism causing liquid to flow from within the longitudinal supply tube portion toward the injection hole side by rearward movement of the trigger portion, the trigger mechanism comprising: a main piston which moves forward and backward with the movement of the trigger portion; a main cylinder that pressurizes and depressurizes an inside as the main piston moves, and the inside communicates with the inside of the longitudinal supply cylinder; a biasing member that is disposed inside the main cylinder and biases the main piston toward the front; and a restricting member that is fitted to the main cylinder and restricts the main piston from falling forward.

According to the trigger type liquid injector of the fifth aspect of the present invention, when the trigger mechanism is operated to move the trigger portion rearward, the main piston retreats to pressurize the main cylinder body, and the liquid in the main cylinder body flows from the inside of the longitudinal supply cylinder portion toward the injection hole side. This allows the liquid to be ejected forward through the ejection hole of the nozzle member. Further, when the operation of the trigger mechanism is stopped, since the urging member that urges the master piston forward is provided in the master cylinder, the master piston advances together with the trigger portion to decompress the master cylinder, and the liquid can be sucked from the reservoir. Here, a restricting member is fitted to the main cylinder, and the restricting member restricts the main piston from coming off forward. Therefore, even in a state before the trigger portion is assembled, the advance of the master piston can be reliably restricted. In addition, the main cylinder, the urging member, the main piston, and the restricting member can be unitized and assembled in advance. Therefore, the assembly of the injector body becomes easy.

A sixth aspect of the present invention is the trigger type liquid injector according to the fifth aspect, wherein a guide cylinder that guides the main piston in the front-rear direction is provided inside the main cylinder, and the main piston includes: an inner lip portion that is in sliding contact with an outer wall surface of the guide cylinder; an outer lip portion that is in sliding contact with an inner wall surface of the main cylinder; and a lip connecting portion connecting the inner lip and the outer lip, wherein the regulating member includes a regulating piece that abuts the lip connecting portion in the front-rear direction to regulate the main piston from coming off forward.

In this case, the restriction piece of the restriction member directly contacts the lip connecting portion connecting the inner lip and the outer lip of the master piston in the front-rear direction, so that the advance of the master piston can be restricted without deforming the inner lip and the outer lip. Therefore, the slidability and sealability of the master piston with respect to the guide cylinder and the master cylinder can be ensured.

A seventh aspect of the present invention is the trigger type liquid ejector according to the fifth or sixth aspect, wherein the regulating member includes: an outer cylinder part which is externally embedded in the main cylinder body; an inner cylinder portion that is provided in connection with the outer cylinder portion, is inserted into the inside of the main cylinder, and is disposed so as to be spaced apart from the entire circumference of the inner wall surface of the main cylinder; and a pair of groove portions formed on the outer peripheral surface of the inner tube portion and extending in the front-rear direction.

In this case, since the outer tube portion of the regulating member is fitted to the main cylinder, the mounting of the regulating member to the main cylinder is facilitated. Further, since the inner tube portion of the regulating member is inserted into the inner side of the main cylinder body so as to be disposed with a gap therebetween with respect to the entire circumference of the inner wall surface of the main cylinder body, and the pair of groove portions extending in the front-rear direction are formed in the outer circumferential surface of the inner tube portion, the inner tube portion can be inserted into a predetermined position in the main cylinder body without depending on the dimensional accuracy of the inner wall surface of the main cylinder body, and the advance of the main piston can be regulated.

An eighth aspect of the present invention is the trigger type liquid ejector according to any one of the fifth to seventh aspects, wherein the biasing member is a metal spring, and the ejector body includes: an accumulation cylinder for supplying the liquid passing through the longitudinal supply tube portion from the main cylinder to the inside by the rearward movement of the trigger portion; an accumulation plunger disposed in the accumulation cylinder so as to be movable in an axial direction along a central axis of the accumulation cylinder, the accumulation plunger being movable toward one side in the axial direction and biased toward the other side as liquid is supplied into the accumulation cylinder; a first check valve that cuts off communication in the longitudinal supply tube portion passing between the reservoir body and the master cylinder body when the master cylinder body is pressurized, and allows communication in the longitudinal supply tube portion between the reservoir body and the master cylinder body when the master cylinder body is depressurized; and a second check valve that allows communication in the longitudinal supply tube portion between the accumulation cylinder body and the master cylinder body to pass therethrough when the master cylinder body is pressurized, and cuts off communication in the longitudinal supply tube portion between the accumulation cylinder body and the master cylinder body when the master cylinder body is depressurized.

In this case, the force application member is a metal spring, so that the suction of the liquid into the master cylinder body can be enhanced. In addition, the liquid can be injected through the injection hole while the liquid is supplied from the main cylinder into the accumulation cylinder through the longitudinal supply tube portion by the first check valve and the second check valve, and the accumulation cylinder can be pressurized. Therefore, the accumulation plunger can be pushed toward one side in the axial direction against the forward biasing force, and the accumulation plunger can be moved toward one side in the axial direction while ejecting the liquid. Therefore, each time the trigger portion is pulled, the accumulation plunger can be moved to one side in the axial direction, and the liquid can be injected while accumulating (filling) the liquid in the accumulation cylinder. When the operation of the trigger portion is stopped after the liquid is filled into the accumulation cylinder, the supply of the liquid into the accumulation cylinder is stopped by the longitudinal supply tube portion, but the accumulation plunger starts to return to the other side in the axial direction. This allows the liquid filled in the accumulation cylinder to be pushed out from the accumulation cylinder toward the injection hole, and to be injected from the injection hole. Thus, continuous ejection of liquid can be performed.

Technical effects

According to the trigger type liquid ejector of the present invention, contact between the biasing member that biases the trigger portion and the liquid can be suppressed, and the liquid can be continuously ejected, and further, the advance of the main piston can be restricted without depending on the assembled state of the trigger portion.

Drawings

Fig. 1 is a longitudinal sectional view of a trigger type liquid ejector according to a first embodiment of the present invention.

Fig. 2 is an enlarged view of a main portion of the trigger type liquid ejector shown in fig. 1.

Fig. 3 is a front view of a trigger type liquid ejector according to a first embodiment of the present invention.

Fig. 4 is a side view of a trigger type liquid sprayer of the first embodiment of the invention.

Fig. 5 is a side view showing a case where a trigger portion of the trigger type liquid ejector of the first embodiment of the present invention is pulled.

Fig. 6 is a longitudinal sectional view showing a trigger type liquid ejector according to a second embodiment of the present invention.

Fig. 7 is an enlarged view showing a main part of a trigger mechanism of a second embodiment of the present invention.

Fig. 8 is a rear view showing a restricting member of a second embodiment of the present invention.

Fig. 9 is a longitudinal sectional view showing a modified example of the trigger type liquid ejector according to the second embodiment of the present invention.

Fig. 10 is a rear view showing a regulating member in a modification of the trigger type liquid ejector according to the second embodiment of the present invention.

Symbol description

1. 201 Trigger type liquid ejector

2. 202 Injector body

3. 203 Nozzle assembly

4. 204 Spray holes

5. 205 Cover (cover parts)

10. 210 Longitudinal feed barrel

11. 212 Pipe

20. 230 Connecting cylinder part

21. An opening part

30. 211 Mounting cover

40. 240 Accumulating cylinder

40A, 241 storage space

41. Supply hole

50. 250 Accumulating plunger

60. 251 Plunger force application component

70. 260 Injection cylinder part

80. 220 Trigger mechanism

81. 221 Trigger portion

81A side wall

81A opening part

81B front wall

81C reinforcing rib

81D connecting shaft

82. 223 Master cylinder

82A, 225 guide cylinder

83. 222 Main piston

84 Coil spring (force application component)

224 Piston force applying component (force applying component)

85. 270 Sliding part

85A, 222b inner lip

85B, 222c lip connection

85C, 222d outer lip

86. 222A protrusion (piston body)

86A, 271 front end portion

86B recess

90. 213 Ball valve (first check valve)

91. 214 Accumulator valve (second check valve)

100. 231 Closure plug

110. Barrel part for 215 cylinder body

111, 216 Fitting the cylindrical portion

120. Mounting cylinder part

121. Nozzle shaft

122. Nozzle cover

130 Spring holder (spring seat)

131. 302 Inner cylinder part

131A rear end part

132 Locking part

132A extension

132B insert

133. 307 Groove part

134 Bearing part

135 Side wall portion

210A third vent

215A second vent hole

223A flange

223B first vent

225A recess

300. Limiting component

301. Outer cylinder

302. Inner cylinder

306. Through hole

303. Limiting sheet

304. Fitting sheet

305. Annular connecting part

306. Through hole

A container body

O1 axis

O2 axis

O3 axis

T-stop

S1 first gap

S2 second gap

Detailed Description

< First embodiment >, first embodiment

A first embodiment of the trigger type liquid ejector according to the present invention will be described below with reference to the drawings. In this embodiment, a spray container in which a trigger type liquid sprayer is attached to a container body will be described as an example.

As shown in fig. 1, a trigger type liquid ejector 1 of the present embodiment includes: an ejector main body 2 attached to a container body a for accommodating a liquid; a nozzle member 3 formed with an injection hole 4 for injecting a liquid and mounted to the injector body 2; and a cover 5 that covers the injector body 2 and the nozzle member 3. The respective components of the trigger type liquid ejector 1 are molded products using synthetic resin unless otherwise specified.

(Injector body)

The injector body 2 mainly includes a longitudinal supply cylinder 10, a connection cylinder 20, a mounting cover 30, a storage cylinder 40, a storage plunger 50, a plunger biasing member 60, an injection cylinder 70, a trigger mechanism 80, a ball valve 90, and a storage valve 91.

In the present embodiment, the central axis of the longitudinal supply tube portion 10 is defined as an axis O1, the container body a side is defined as a lower side along the axis O1, the opposite side is defined as an upper side, and the direction along the axis O1 is defined as an up-down direction. In a plan view from the vertical direction, one direction intersecting the axis O1 is referred to as a front-rear direction, and a direction orthogonal to both the vertical direction and the front-rear direction is referred to as a left-right direction.

In the present embodiment, the central axis of the accumulation cylinder 40 is defined as the axis O2. In the present embodiment, the axis O2 extends in the front-rear direction. Therefore, in the present embodiment, the front-rear direction corresponds to the axial direction along the central axis of the accumulation cylinder 40. In the present embodiment, the rear corresponds to one side in the axial direction along the central axis of the accumulation cylinder 40, and the front corresponds to the other side in the axial direction along the central axis of the accumulation cylinder 40. The axial direction along the axis O2 may not coincide with the front-rear direction.

The longitudinal supply tube portion 10 extends in the up-down direction and has a function of sucking the liquid in the container body a. The longitudinal supply tube 10 is attached to the container body a by the attachment cover 30. An upper portion of a tube 11 extending in the up-down direction and sucking liquid from the container body a is fitted to the longitudinal supply tube portion 10.

As shown in fig. 1, a connecting tube 20 extending forward is provided at an upper end of the longitudinal supply tube 10. The connection tube portion 20 is formed in a tubular shape having an opening portion 21 that opens to the front of the injector body 2, and communicates with the inside of the longitudinal supply tube portion 10. A closing plug 100 is attached to the opening 21 of the connection tube 20, and the closing plug 100 closes (seals) the opening 21.

A cylinder block tube 110 is provided below the connection tube 20 and above the mounting cover 30. The cylinder tube 110 protrudes forward from the longitudinal supply tube 10 and opens forward. The main cylinder 82 is fitted into the cylinder tube 110. The main cylinder 82 is formed in a bottomed cylinder shape that is open at the front and closed at the rear. The main cylinder 82 communicates with the inside of the longitudinal feed cylinder 10.

The accumulation cylinder 40 is disposed above the longitudinal supply cylinder 10 and the connection cylinder 20. In the present embodiment, the lower end of the accumulation cylinder 40 is integrally formed with the upper end of the longitudinal supply tube 10 and the upper end of the connection tube 20. By the trigger portion 81 swinging backward, the liquid passing through the inside of the longitudinal supply tube portion 10 and the inside of the connection tube portion 20 is supplied to the inside of the accumulation cylinder 40 (accumulation space 40a described later). Specifically, a supply hole 41 communicating with the inside of the connecting tube portion 20 is formed in a lower portion of the front end portion of the accumulation cylinder 40. The supply hole 41 is opened at a position further rearward than the closing plug 100 described later. This allows the liquid passing through the inside of the longitudinal supply tube 10 and the inside of the connection tube 20 to be supplied into the accumulation cylinder 40 through the supply hole 41.

The accumulation plunger 50 is disposed in the accumulation cylinder 40 so as to be movable in the front-rear direction along the axis O2. Thereby, the accumulation plunger 50 slides tightly in the front-rear direction in the accumulation cylinder 40. The accumulation plunger 50 moves rearward as the liquid is supplied into the accumulation cylinder 40. When the accumulation plunger 50 is moved rearward while cutting off the communication between the inside of the longitudinal supply cylinder 10 and the injection hole 4 in the connection cylinder 20, the communication between the inside of the longitudinal supply cylinder 10 and the injection hole 4 in the connection cylinder 20 is allowed. That is, the accumulation plunger 50 cuts off the communication between the inside of the longitudinal supply cylinder 10 and the injection hole 4 (inside of the injection cylinder 70) in the connection cylinder 20 at the forefront position, and allows the communication between the inside of the longitudinal supply cylinder 10 and the injection hole 4 (inside of the injection cylinder 70) in the connection cylinder 20 to pass when moving backward from the forefront position. In the accumulation cylinder 40, a space located forward of the accumulation plunger 50 functions as an accumulation space 40 a.

The accumulation space 40a accumulates the liquid passing through the inside of the longitudinal supply cylinder 10 and the inside of the connection cylinder 20 and passing through the supply hole 41. Since the accumulation plunger 50 moves rearward due to the supply of the liquid, the accumulation space 40a expands. The accumulation space 40a can also communicate with the inside of the injection tube portion 70 described later.

The plunger biasing member 60 biases the accumulation plunger 50 forward. The plunger biasing member 60 is disposed in the accumulation cylinder 40 at a position further rearward than the accumulation plunger 50. In an initial state before the trigger 81 is operated, the plunger biasing member 60 biases the accumulation plunger 50 forward. Thereby, the accumulation plunger 50 is positioned at the forefront position. The plunger biasing member 60 is a metal coil spring disposed coaxially with the axis O2. Here, for example, a spring made of resin may be used as the plunger biasing member 60, or another member having elasticity may be used.

In the accumulation cylinder 40 and the accumulation plunger 50 configured as described above, the liquid can be pressurized in the accumulation space 40a until the accumulation plunger 50 moves backward. After that, when the hydraulic pressure in the accumulation space 40a reaches a predetermined value, the accumulation plunger 50 moves rearward against the plunger biasing member 60. This allows the liquid in the accumulation space 40a to be supplied to the injection hole 4. Therefore, the accumulation plunger 50 can be made to function as an accumulation valve.

The injection tube 70 extends forward from the accumulation cylinder 40. The injection cylinder 70 communicates with the inside of the longitudinal supply cylinder 10 through the inside of the accumulation cylinder 40 (accumulation space 40 a) and the inside of the connection cylinder 20. Thus, the injection cylinder 70 can guide the liquid passing through the inside of the longitudinal supply cylinder 10, the inside of the connecting cylinder 20, and the inside of the accumulation cylinder 40 (accumulation space 40 a) to the injection hole 4.

The trigger mechanism 80 includes a trigger portion 81, a main cylinder 82, a main piston 83, and a coil spring 84 (urging member). The trigger mechanism 80 can circulate the liquid from the inside of the longitudinal supply tube 10 to the injection hole 4 side through the inside of the connection tube 20 by swinging the trigger portion 81 rearward.

The trigger 81 is disposed in front of the longitudinal supply tube 10 so as to be movable rearward in a state of being biased forward. The trigger portion 81 is formed to extend in the up-down direction and is disposed below the injection cylinder portion 70. The upper end of the trigger 81 is pivotally supported by the nozzle member 3 so as to be swingable in the front-rear direction, and the lower end of the trigger 81 is disposed in front of the main cylinder 82.

In the illustrated example, a stopper T is provided in a gap in the front-rear direction between the trigger portion 81 and the main cylinder 82. The stopper T is abutted against the trigger portion 81 and the main cylinder 82, respectively, to thereby restrict rearward swing of the trigger portion 81. The stopper T is not necessarily required, and may not be provided.

The master piston 83 is disposed inside the master cylinder 82 so as to be movable in the front-rear direction. The master piston 83 is movable in the front-rear direction in conjunction with the swing of the trigger 81. Thereby, the inside of the main cylinder 82 is pressurized and depressurized with the movement of the main piston 83 in the front-rear direction. The main piston 83 is formed in a cylinder shape having a top and opened at the rear and closed at the front.

The main piston 83 is biased forward by the biasing force of the coil spring 84 via the trigger 81. The main piston 83 is pushed into the main cylinder 82 by being moved rearward by the rearward swing of the trigger 81. When the trigger 81 is located at the forward-most swing position, the master piston 83 is located at the forward-most position corresponding to the trigger 81 located at the forward-most swing position.

The coil spring 84 is made of, for example, metal. The coil spring 84 is disposed coaxially with the main piston 83 and the main cylinder 82, and biases the trigger portion 81 to which the main piston 83 is coupled in the forward direction. The coil spring 84 is disposed between a spring holder 130 (spring seat) attached to the front opening of the main cylinder 82 and the trigger 81. The material of the coil spring 84 is not limited to metal, and for example, a resin spring or the like may be used.

The ball valve 90 and the accumulation valve 91 are provided in the longitudinal supply cylinder 10. The ball valve 90 is provided as a check valve, that is, a check valve that cuts off communication between the inside of the container body a and the inside of the main cylinder 82 in the longitudinal supply cylinder 10 when the inside of the main cylinder 82 is pressurized, and is displaced 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 in the longitudinal supply cylinder 10 to pass.

An accumulation valve 91 is disposed above the ball valve 90. The accumulation valve 91 is a check valve that allows the liquid to be supplied from the inside of the longitudinal supply cylinder 10 into the accumulation cylinder 40 passing through the inside of the connection cylinder 20, and restricts the outflow of the liquid from the inside of the accumulation cylinder 40 into the longitudinal supply cylinder 10 passing through the inside of the connection cylinder 20.

The cover 5 is formed to cover the entire longitudinal supply cylinder 10, the entire injection cylinder 70, and the entire accumulation cylinder 40 except for the lower end portion of the longitudinal supply cylinder 10 at least from both sides and above in the left-right direction.

(Nozzle component)

The nozzle member 3 is assembled to the injector body 2 mainly by the injection tube portion 70. The nozzle member 3 includes: a mounting cylinder 120 externally fitted to the injection cylinder 70 from the front; a nozzle shaft portion 121 located at a position inside the front end portion of the mounting tube portion 120; and a nozzle cover 122 mounted to the nozzle shaft 121. The nozzle cover 122 is formed with an injection hole 4 that opens forward and injects liquid forward.

(Coil spring)

In the trigger type liquid ejector 1 configured as described above, the arrangement of the coil spring 84 and the configuration of the periphery of the coil spring 84 described above will be described.

As shown in fig. 2, a cylindrical guide cylinder 82a protruding forward from the central portion of the rear wall portion is provided in a bottomed cylindrical main cylinder 82 that opens forward. The front end portion of the guide tube 82a is located further rearward than the front end portion of the main cylinder 82. The bottom of the guide tube 82a is formed in a ring shape. A fitting tube 111 provided in the cylinder tube 110 is fitted inside the guide tube 82a. The distal end of the fitting tube 111 protrudes into the guide tube 82a. The guide tube 82a is disposed coaxially with the fitting tube portion 111.

In the present embodiment, the coaxial center axes of the main cylinder 82, the guide cylinder 82a, the cylinder portion 110, and the fitting cylinder portion 111 extending in the front-rear direction are defined as the axis O3. In a plan view from the axis O3 direction, a direction intersecting the axis O3 is referred to as a radial direction, and a direction surrounding the axis O3 is referred to as a circumferential direction.

The master piston 83 includes: a sliding portion 85 disposed inside the main cylinder 82 so as to be movable in the front-rear direction; and a protrusion 86 protruding forward from the slide portion 85 toward the outside of the main cylinder 82, wherein a front end 86a of the protrusion 86 is coupled to the trigger portion 81. The sliding portion 85 is annularly provided at the rear end portion of the main piston 83 having a top cylindrical shape. A guide tube 82a is inserted inside the slide portion 85.

The slide portion 85 includes: an inner lip 85a in sliding contact with the outer peripheral surface of the guide tube 82 a; a lip coupling portion 85b extending radially outward from the inner lip portion 85 a; and an outer lip 85c that is provided in connection with the radially outer side of the lip coupling portion 85b and that is in sliding contact with the inner peripheral surface of the main cylinder 82. The rear end portion of the inner lip 85a extends radially inward and is in sliding contact with the outer peripheral surface of the guide tube 82 a. Thereby, sealability is ensured between the inner lip 85a and the outer peripheral surface of the guide cylinder 82 a.

The lip connecting portion 85b is formed in an annular shape connecting the inner lip 85a and the outer lip 85c in the radial direction. The front surface of the lip connecting portion 85b is formed in a planar shape. The outer lip 85c is formed so as to have a pair of front and rear portions that expand in diameter from the outer Zhou Duanchao of the lip coupling portion 85b forward and rearward, and is in sliding contact with the inner peripheral surface of the main cylinder 82. Thereby, the sealing property is ensured between the outer lip 85c and the inner peripheral surface of the main cylinder 82.

The protrusion 86 of the main piston 83 extends forward from the front end portion of the inner lip 85a, and protrudes outward from the front opening of the main cylinder 82. A pair of concave portions 86b recessed in the left-right direction are formed in the front end portion 86a of the protrusion 86. The concave portion 86b extends in the up-down direction, and is formed in a substantially arc shape protruding rearward, even in a substantially half-moon shape. A coupling shaft 81d provided in the trigger portion 81 is inserted into the recess 86b from the left-right direction.

The trigger 81 includes: a pair of left and right side walls 81a; a front wall 81b connecting between the pair of left and right side walls 81a; and a plurality of reinforcing ribs 81c connecting the front wall 81b and the pair of left and right side walls 81a at the rear side of the front wall 81 b. An opening 81A is formed in the front wall 81 b. A coupling shaft 81d is provided in the opening 81A, and the coupling shaft 81d is coupled to a distal end 86a of the protrusion 86 inserted into the opening 81A.

The coil spring 84 is disposed outside the space surrounded by the main cylinder 82 and the main piston 83, and biases the trigger portion 81 forward in a state where the protrusion 86 of the main piston 83 is inserted inside. The tip of the coil spring 84 abuts against the trigger portion 81. In the present embodiment, the distal end of the coil spring 84 abuts against the rear end portions of the pair of right and left side walls 81A of the trigger portion 81, the rear end portions of the reinforcing ribs 81c disposed below the opening portion 81A, and the like.

A spring seat for receiving the tip of the coil spring 84 in a flat surface may be provided on the rear side of the trigger portion 81. However, the protrusion 86 of the main piston 83 is inserted inside the coil spring 84, limiting the posture of the coil spring 84. Therefore, there is no problem even if the tip of the coil spring 84 is made to abut obliquely with respect to the trigger portion 81 as in the present embodiment. In addition, there is no problem even if the coil spring 84 is disposed so that the intermediate portion in the front-rear direction is curved.

A spring holder 130 receiving the rear end of the coil spring 84 is attached to the front opening of the main cylinder 82. The spring holder 130 is formed in a ring shape coaxial with the axis O3. The spring holder 130 includes: an inner cylinder 131 inserted into the main cylinder 82; and a locking portion 132 that is provided in connection with the inner tube portion 131, extends radially outward of the cylinder tube portion 110, and is locked to the outside of the cylinder tube portion 110.

The locking portion 132 includes: an extension 132a extending upward from the upper portion of the distal end of the inner tube 131; and an insertion portion 132b extending rearward from an upper end portion of the extension portion 132 a. The upper end of the extension 132a extends upward from the upper end of the cylinder tube 110. The insertion portion 132b is inserted into a gap between the cylinder portion 110 and the connecting cylinder portion 20 radially outside the cylinder portion 110. A step facing the closure plug 100 in the front-rear direction is provided on the upper surface side of the insertion portion 132 b.

The inner tube 131 is inserted into the main cylinder 82 and extends rearward from a position where it is connected to the locking portion 132. The outer peripheral surface of the inner tube 131 is disposed with a gap therebetween with respect to the entire inner peripheral surface of the main cylinder 82. That is, the inner tube 131 is suspended via the locking portion 132 and positioned in the front-rear direction. The rear end 131a of the inner tube 131 is slightly reduced in diameter relative to the inner peripheral surface of the main cylinder 82.

The rear end 131a of the inner cylinder 131 faces the lip coupling 85b in the front-rear direction, and regulates the main piston 83 from coming off forward. A groove 133 extending in the front-rear direction is formed in the outer peripheral surface of the inner tube 131. The groove 133 is formed at a constant depth at least in the lower portion of the outer peripheral surface of the inner tube 131. The groove 133 forms a gap extending in the front-rear direction between the outer peripheral surface of the inner tube 131 and the inner peripheral surface of the main cylinder 82. The gap extends to an opening portion in front of the main cylinder 82.

A protrusion 86 of the master piston 83 is inserted in the front-rear direction inside the inner cylinder 131. Further, a receiving portion 134 for receiving the rear end of the coil spring 84 is formed inside the inner tube portion 131. The receiving portion 134 is a step formed on the front surface side of the rear end portion 131a of the inner tube portion 131, and is formed in a ring shape coaxial with the axis O3.

The spring holder 130 having the above-described structure is provided with a pair of side wall portions 135 protruding forward and sandwiching the coil spring 84 in the left-right direction. The pair of side wall portions 135 cover the coil spring 84 from the left and right sides. In addition, a pair of side wall portions 135 extend in the front-rear direction along the coil spring 84. The front end portions of the pair of side wall portions 135 are disposed so as to sandwich the trigger portion 81 in the left-right direction. As shown in fig. 3, the pair of side wall portions 135 are plate members having a thickness in the left-right direction, and guide the left-right pair of side walls 81a of the trigger portion 81 in the front-rear direction.

(Action of trigger type liquid ejector)

Next, a case will be described in which the trigger type liquid ejector 1 configured as described above is used. First, the movement restriction of the trigger portion 81 by the stopper T is released from the state shown in fig. 4. Next, as shown in fig. 5, the trigger 81 is pulled rearward against the biasing force of the coil spring 84 (see fig. 1). The trigger type liquid ejector 1 fills each portion of the trigger type liquid ejector 1 with liquid by a plurality of operations of the trigger portion 81, and is in a state in which liquid can be sucked into the longitudinal supply tube portion 10.

When the trigger portion 81 is pulled rearward against the biasing force of the coil spring 84, the master piston 83 moves rearward from the forefront position, and the inside of the master cylinder 82 is pressurized. Thereby, the liquid in the main cylinder 82 is supplied to the longitudinal supply cylinder 10. The liquid supplied to the vertical supply tube portion 10 presses the ball valve 90 downward, and lifts the accumulation valve 91.

Thereby, the liquid in the longitudinal supply tube portion 10 can be supplied to the accumulation space 40a of the accumulation cylinder 40 through the inside of the connection tube portion 20 and the supply hole 41, and the accumulation space 40a can be pressurized. Accordingly, with the pressurization of the accumulation space 40a, the accumulation plunger 50 can be moved rearward from the maximum advanced position against the urging force of the plunger urging member 60, and the liquid can be accumulated (filled) in the accumulation space 40a. By moving the accumulation plunger 50 rearward, the liquid in the accumulation space 40a having an increased pressure can be guided to the injection hole 4 through the injection tube 70. This allows the liquid to be ejected forward from the ejection hole 4.

As described above, each time the trigger portion 81 is pulled backward, the liquid can be ejected from the ejection hole 4, and the accumulation plunger 50 can be moved backward to accumulate the liquid in the accumulation space 40 a.

Then, when the trigger 81 is released, the trigger 81 is returned forward by the elastic restoring force (urging force) of the coil spring 84, and therefore the master piston 83 connected to the trigger 81 is also returned forward in the master cylinder 82. Accordingly, the pressure in the main cylinder 82 can be reduced to a pressure lower than the pressure in the container a, and the ball valve 19 can be raised while the accumulation valve 91 is kept closed. Therefore, the liquid in the container body a can be sucked into the longitudinal supply cylinder 10 and introduced into the main cylinder 82. This makes it possible to prepare for the next injection.

When the rearward operation of the trigger 81 is stopped, the supply of the liquid to the accumulation space 40a in the longitudinal supply tube 10 and the connection tube 20 is stopped, and the accumulation plunger 50 is moved forward toward the maximum advanced position by the biasing force of the plunger biasing member 60. At this time, the outflow of the liquid from the accumulation space 40a into the longitudinal supply tube portion 10 is restricted by the accumulation valve 91.

This can guide the liquid stored in the storage space 40a to the injection hole 4 through the inside of the injection tube 70, and can continuously inject the liquid forward through the injection hole 4. In this way, not only when the trigger portion 81 is pulled backward, but also when the trigger portion 81 is not operated, the liquid can be ejected, and the liquid can be ejected continuously.

As described above, according to the trigger type liquid ejector 1 of the present embodiment, not only when the trigger portion 81 is pulled backward, but also when the trigger portion 81 is not operated, the liquid can be ejected, and the continuous ejection of the liquid can be performed. The upper end portion (fulcrum) of the trigger portion 81 is swingably pivotally supported by the nozzle member 3, and a master piston 83 is connected to the intermediate portion (operating point) of the trigger portion 81. Thus, for example, by operating the lower end portion (force point) of the trigger portion 81, the main piston 83 can be efficiently moved by the lever principle. Therefore, the operability of the trigger portion 81 can be improved.

Further, as shown in fig. 2, according to the trigger type liquid ejector 1 of the present embodiment, the trigger portion 81 is biased toward the front by the coil spring 84. In particular, a protrusion 86 of the main piston 83, which protrudes outward from the front opening of the main cylinder 82 and has a distal end 86a connected to the trigger 81, is inserted inside the coil spring 84. Accordingly, the coil spring 84 can be disposed outside the space surrounded by the main cylinder 82 and the main piston 83, and the trigger portion 81 can be biased. Thus, the liquid sucked into the main cylinder 82 does not react by coming into liquid contact with the coil spring 84. Therefore, deterioration of the coil spring 84, deterioration of the liquid, and the like can be prevented, and the trigger type liquid ejector 1 suitable for continuous ejection of the liquid can be obtained.

As described above, the trigger type liquid ejector 1 of the present embodiment includes: an ejector main body 2 attached to a container body a containing a liquid; and a nozzle member 3 which is attached to the injector body 2 and is formed with an injection hole 4 to inject liquid. The injector body 2 includes: a longitudinal supply tube portion 10 that sucks the liquid in the container body a; a trigger mechanism 80 having a trigger portion 81 disposed so as to be movable rearward in a state of being biased forward, the trigger mechanism 80 causing liquid to flow from the inside of the longitudinal supply tube portion 10 toward the injection hole 4 side by rearward movement of the trigger portion 81; a storage cylinder 40 that moves the trigger 81 rearward to supply the liquid passing through the longitudinal supply tube 10 to the inside; and an accumulation plunger 50 disposed in the accumulation cylinder 40 so as to be movable in an axial direction along a central axis of the accumulation cylinder 40, and biased toward one side in the axial direction as the liquid is supplied into the accumulation cylinder 40. The trigger mechanism 80 includes: a main cylinder 82 that is open to the front and communicates with the inside of the longitudinal supply cylinder 10 at the rear; a main piston 83 having a sliding portion 85 movably disposed in the front-rear direction inside the main cylinder 82, and a protrusion 86 protruding forward from the sliding portion 85 toward the outside of the main cylinder 82 and having a front end portion 86a coupled to the trigger portion 81; and a coil spring 84 that is inserted with a protrusion 86 of the main piston 83 inside and biases the trigger portion 81 forward. According to this structure, contact between the coil spring 84 that biases the trigger portion 81 and the liquid can be suppressed, and the liquid can be continuously ejected.

In the present embodiment, the trigger type liquid injector 1 includes a spring holder 130, and the spring holder 130 is attached to the front opening of the main cylinder 82 and receives the rear end of the coil spring 84. According to this structure, the spring holder 130 can be attached to the front opening of the main cylinder 82, and the coil spring 84 can be disposed between the spring holder 130 and the trigger 81. Further, the spring holder 130 can restrict the main piston 83 from falling out of the front opening of the main cylinder 82.

In the present embodiment, the spring holder 130 includes a pair of side wall portions 135 sandwiching the coil spring 84 in the left-right direction. According to this structure, the coil spring 84 disposed outside the space surrounded by the main cylinder 82 and the main piston 83 is sandwiched by the pair of left and right side wall portions 135, so that the coil spring 84 is less visible from outside, and the design can be improved (see fig. 4 and 5). Further, the adhesion of the liquid or the like scattered by the spray to the coil spring 84 can be suppressed by the pair of left and right side wall portions 135. Further, the diagonal pulling of the trigger portion 81 (pulling such as twisting the shaft support portion of the trigger portion 81) can be suppressed by the pair of left and right side wall portions 135.

In the present embodiment, the spring holder 130 includes: an inner cylinder 131 inserted into the main cylinder 82; a receiving portion 134 formed inside the inner tube portion 131 and receiving a rear end of the coil spring 84; and a groove 133 formed on the outer side of the inner cylinder 131, and forming a gap extending in the front-rear direction between the outer peripheral surface of the inner cylinder 131 and the inner peripheral surface of the main cylinder 82. According to this structure, since the inner cylinder portion 131 of the spring holder 130 is inserted into the main cylinder 82, the attachment of the spring holder 130 to the main cylinder 82 is facilitated. Further, the main piston 83 sliding in the main cylinder 82 can be restricted from falling forward by the inner cylinder 131 inserted into the main cylinder 82. Further, since the groove 133 formed in the inner tube portion 131 of the spring holder 130 forms a gap extending in the front-rear direction between the outer peripheral surface of the inner tube portion 131 and the inner peripheral surface of the main cylinder 82, even if liquid leaks from the gap between the inner peripheral surface of the main cylinder 82 and the sliding contact portion of the main piston 83 that is in sliding contact with the inner peripheral surface, the liquid passes through the gap outside the inner tube portion 131, and therefore, the liquid can be prevented from winding back to the receiving portion 134 that supports the rear end of the coil spring 84 inside the inner tube portion 131 and the liquid contact with the coil spring 84.

Although the first embodiment of the present invention has been described above, the first embodiment is presented as an example of the present invention and is not intended to limit the scope of the invention. The embodiments of the present invention can be implemented in various other modes, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. The embodiments and modifications thereof include, for example, those that can be easily understood by those skilled in the art, those that are substantially the same, those that are equivalent in scope, and the like.

For example, in the above embodiment, the case where the spring holder 130 is attached to the front opening of the main cylinder 82 has been described as an example, but the spring holder 130 receiving the rear end of the coil spring 84 may not be attached. In this case, for example, the rear end of the coil spring 84 may be received on the front surface side of the lip coupling portion 85b of the main piston 83.

For example, in the above embodiment, the case where the diagonal pulling of the trigger portion 81 is suppressed by the pair of right and left side wall portions 135 has been described as an example, but the pair of right and left side wall portions 135 may have only the cover function of covering the coil spring 84 without the guide function of the trigger portion 81.

For example, only one locking portion 132 of the spring holder 130 may be formed, or a plurality of locking portions may be formed at intervals in the circumferential direction. In the case where only one locking portion 132 is formed, the locking portion 132 may be formed in a tubular shape surrounding the cylinder portion 110 from the outside in the radial direction. The locking portion 132 may be locked to the cylinder tube 11 by screwing the locking portion 132 to the outer peripheral surface of the cylinder tube 110.

The components in the above-described embodiments may be appropriately replaced with known components within a range not departing from the gist of the present invention.

< Second embodiment >

A trigger type liquid ejector according to a second embodiment of the present invention will be described below with reference to the accompanying drawings. In the following description, a spouting container having a trigger type liquid spouting device mounted on a container body is exemplified.

As shown in fig. 6, the trigger type liquid ejector 201 of the present embodiment includes: an ejector main body 202 attached to a container body a for containing a liquid; a nozzle member 203 formed with an injection hole 204 for injecting liquid and mounted to the injector body 202; and a cover member (cover body) 205 that covers the injector body 202 and the nozzle member 203. The respective components of the trigger type liquid ejector 201 are molded products using synthetic resin unless otherwise specified.

The injector body 202 mainly includes a longitudinal supply cylinder 210, a trigger mechanism 220, a connection cylinder 230, an accumulation cylinder 240, an accumulation plunger 250, and an injection cylinder 260. In the following description, the central axis of the longitudinal supply tube portion 210 is defined as an axis O1, along which axis O1, the container body a side is defined as the lower side, the opposite side is defined as the upper side, and the direction along the axis O1 is defined as the up-down direction. In a plan view from the vertical direction, one direction intersecting the axis O1 is referred to as a front-rear direction, and a direction orthogonal to both the vertical direction and the front-rear direction is referred to as a left-right direction.

The central axis of the accumulation cylinder 240 is defined as the axis O2. In the present embodiment, the axis O2 extends in the front-rear direction. In the present embodiment, the front-rear direction corresponds to the axial direction along the central axis of the accumulation cylinder 240. In the present embodiment, the rear corresponds to one side in the axial direction along the central axis of the accumulation cylinder 240, and the front corresponds to the other side in the axial direction along the central axis of the accumulation cylinder 240. The axial direction along the axis O2 may not coincide with the front-rear direction.

The longitudinal supply tube portion 210 extends in the up-down direction and sucks the liquid in the container body a. The longitudinal supply tube 10 is attached to the container body a by the attachment cover 211. An upper portion of a tube 212 extending in the up-down direction and sucking liquid from the container body a is fitted to the longitudinal supply tube portion 210. A first check valve 213 (ball valve) and a second check valve 214 (accumulation valve) are provided in the longitudinal supply tube portion 210 at positions above the fitting position of the tube 212.

The first check valve 213 cuts off communication between the inside of the container body a and the inside of the main cylinder 223 passing through the inside of the longitudinal feed cylinder 210 when the inside of the main cylinder 223 of the trigger mechanism 220 is pressurized, and is displaced upward when the inside of the main cylinder 223 is depressurized, thereby allowing communication between the inside of the container body a and the inside of the main cylinder 223 passing through the inside of the longitudinal feed cylinder 210.

A second check valve 214 is disposed above the first check valve 213. The second check valve 214 allows the liquid to be supplied from the inside of the longitudinal supply cylinder portion 210 into the accumulation cylinder 240, and restricts the outflow of the liquid from the inside of the accumulation cylinder 240 into the longitudinal supply cylinder portion 210.

A cylinder portion 215 is provided on the front side of the longitudinal feed cylinder portion 210. The cylinder tube 215 protrudes forward from the longitudinal supply tube 10 and opens forward. A main cylinder 223 is fitted into the cylinder tube 215. The main cylinder 223 is formed in a bottomed cylinder shape that is open at the front and closed at the rear. The main cylinder 223 communicates with a space between the first check valve 213 and the second check valve 214 in the longitudinal feed tube 210 at a part of the rear wall portion thereof.

The trigger mechanism 220 includes a trigger portion 221, a master piston 222, a master cylinder 223, and a piston urging member 224 (urging member). The trigger mechanism 220 can circulate the liquid from the inside of the longitudinal supply tube 210 toward the injection hole 204 side by moving the trigger portion 221 rearward.

The trigger 221 is disposed in front of the longitudinal supply tube 210 so as to be movable rearward in a state of being biased forward. The trigger 221 is pivotally supported below the injection cylinder 260 by the nozzle member 203 so as to be swingable in the front-rear direction. The trigger 221 extends downward from the axial supporting position of the nozzle member 203 and is located in front of the master piston 222 and the master cylinder 223.

In the present embodiment, a stopper T is detachably provided in a gap in the front-rear direction between the trigger portion 221 and the main cylinder 223. Stopper T is brought into contact with trigger unit 221 and main cylinder 223, respectively, to thereby restrict rearward swing of trigger unit 221. The stopper T may be detached.

The master piston 222 is disposed inside the master cylinder 223 so as to be movable in the front-rear direction. The master piston 222 is movable in the front-rear direction in conjunction with the movement of the trigger 221. The inside of the main cylinder 223 is pressurized and depressurized as the main piston 222 moves in the front-rear direction. The main piston 222 is formed in a cylinder shape having a top that is open at the rear and closed at the front.

The master piston 222 is urged forward by the urging force of the piston urging member 224 together with the trigger portion 221. The master piston 222 is pushed into the master cylinder 223 by rearward movement of the trigger 221. When the trigger portion 221 is located at the forward-most swing position, the master piston 222 is located at the forward-most position corresponding to the trigger portion 221 located at the forward-most swing position.

The piston urging member 224 is a metal spring. The piston urging member 224 is disposed coaxially with the master piston 222 and the master cylinder 223, and urges the trigger portion 221 forward via the master piston 222. The piston urging member 224 is disposed between the top wall of the main piston 222 and the bottom wall of the main cylinder 223. The material of the piston biasing member 224 is not limited to metal, and for example, a resin spring or the like may be used.

The connection tube 230 is disposed above the cylinder 215. The connection tube 230 extends forward from the upper end of the longitudinal supply tube 210. The inside of the connection tube 230 communicates with a position above the closed position of the second check valve 214 in the longitudinal feed tube 210. A closing plug 231 is fitted to the front end of the connection tube 230. The liquid flowing forward in the connection tube 230 collides with the closing plug 231 and changes its direction upward, and flows into the accumulation cylinder 240 from the gap between the closing plug 231 and the upper end of the connection tube 230.

The accumulation cylinder 240 is disposed above the longitudinal supply cylinder 210 and the connection cylinder 230. The lower end of the accumulation cylinder 240 of the present embodiment is integrally formed with the upper end of the longitudinal supply cylinder 210 and the upper end of the connection cylinder 230. By the rearward movement of the trigger 221, the liquid passing through the inside of the longitudinal supply tube 210 and the inside of the connection tube 230 is supplied to the inside of the accumulation cylinder 240 (accumulation space 241).

The accumulation plunger 250 is disposed in the accumulation cylinder 240 so as to be movable in the front-rear direction along the axis O2. The accumulation plunger 250 slides in the front-rear direction in the accumulation cylinder 240. The accumulation plunger 250 cuts off communication between the inside of the longitudinal supply cylinder 210 and the injection hole 204 (inside of the injection cylinder 260) at the foremost position. When the accumulation plunger 250 moves rearward from the forefront position, the inside of the longitudinal supply cylinder 210 is communicated with the injection hole 204 (inside of the injection cylinder 260). In the accumulation cylinder 240, a space located forward of the accumulation plunger 250 functions as an accumulation space 241.

The accumulation space 241 accumulates the liquid passing through the inside of the longitudinal supply tube portion 210. The accumulation plunger 250 is moved rearward by the supply of the liquid, and the accumulation space 41 expands. The accumulation plunger 250 moves rearward as the liquid is supplied into the accumulation cylinder 240. The accumulation space 241 communicates with the inside of the longitudinal supply tube 210 through the connection tube 230. The accumulation space 241 may also communicate with the inside of the injection tube 260. When the accumulation plunger 250 is positioned at the forefront position, the accumulation space 241 is blocked from communicating with the inside of the injection cylinder 260. When the accumulation plunger 250 retreats from the forefront position, the accumulation space 241 communicates with the inside of the injection cylinder 260.

A plunger biasing member 251 for biasing the accumulation plunger 250 forward is provided in the accumulation cylinder 240. The plunger biasing member 251 is disposed in the accumulation cylinder 240 at a position further rearward than the accumulation plunger 250. In an initial state before the user operates the trigger 221, the plunger biasing member 251 biases the accumulation plunger 250 forward, and the accumulation plunger 250 is positioned at the forefront position. The plunger biasing member 251 is a metal coil spring disposed coaxially with the axis O2. The plunger biasing member 251 may be a spring made of resin, for example, or may be another member having elasticity.

Until the accumulation plunger 250 moves rearward, the liquid is pressurized in the accumulation space 241 of the accumulation cylinder 240. When the hydraulic pressure in the accumulation space 241 reaches a predetermined value, the accumulation plunger 250 moves rearward against the plunger biasing member 251. This allows the liquid in the storage space 241 to be supplied to the injection hole 204. The accumulation plunger 250 functions as an accumulation valve.

The injection cylinder 260 extends forward from the accumulation cylinder 240. The injection cylinder 260 communicates with the inside of the longitudinal supply cylinder 210 through the inside of the accumulation cylinder 240 (accumulation space 241) and the inside of the connection cylinder 230. The injection cylinder 260 guides the liquid passing through the inside of the longitudinal supply cylinder 210, the inside of the connection cylinder 230, and the inside of the accumulation cylinder 240 (accumulation space 241) to the injection hole 204. The nozzle member 203 is fitted to the injection tube 260 from the front. The nozzle member 203 is formed with an injection hole 204 that opens forward and injects liquid forward.

The cover member 205 is formed to cover the entire supply cylinder portion 210, the entire injection cylinder portion 260, and the entire accumulation cylinder 240 except for the lower end portion of the longitudinal supply cylinder portion 210 at least from both sides and above in the left-right direction.

The trigger type liquid ejector 201 having the above-described structure includes the regulating member 300, and the regulating member 300 is fitted to the main cylinder 223 to regulate the main piston 222 from coming off forward. As shown in the enlarged view of fig. 7, the restricting member 300 includes: an outer cylinder 301 externally fitted to the main cylinder 223; an inner cylinder 302 that is provided in connection with the outer cylinder 301, is inserted into the inside of the main cylinder 223, and is disposed with a gap therebetween with respect to the entire circumference of the inner wall surface of the main cylinder 223; and a regulating piece 303 protruding rearward from the inner tube 302.

Fitting pieces 304 are provided to protrude from the inner peripheral surface of the outer tube 301. As shown in the rear view of the regulating member 300 in fig. 8, a plurality of fitting pieces 304 are provided at intervals in the circumferential direction of the outer tube 301 (in the present embodiment, four pieces are provided at intervals of 90 ° centering on the axis O2). As shown in fig. 7, the fitting piece 304 is in contact with a flange 223a provided at the front end opening of the main cylinder 223 from the rear.

The flange 223a has the same outer diameter as the cylinder tube 215. The flange 223a is disposed with a gap therebetween in the front-rear direction with respect to the front end opening edge of the cylinder tube 215. The fitting piece 204 is disposed so as to be accommodated in a gap between the flange 223a and the front end opening edge of the cylinder tube 215. In this way, by providing the gap between the flange 223a and the front end opening edge of the cylinder tube 215 and housing the fitting piece 304 of the restricting member 300 in the gap, the outer diameter of the main cylinder 223 and the outer diameter of the cylinder tube 215 can be suppressed to the minimum.

The distal end portion of the outer tube 301 and the distal end portion of the inner tube 302 are connected by an annular connecting portion 305. The annular connecting portion 305 is in contact with the front end opening edge of the front surface of the main cylinder 223 including the flange 223a from the front. In the annular connecting portion 305, a through hole 306 (molding hole) for molding the fitting piece 304 is formed at a position opposed to the fitting piece 304 in the front-rear direction.

The inner tube 302 extends rearward from the radially inner end edge of the annular coupling portion 305. The outer peripheral surface of the inner cylinder 302 is disposed with a gap therebetween with respect to the entire inner wall surface of the main cylinder 223. That is, the inner tube 302 is suspended from the outer tube 301 via the annular coupling portion 305, and is positioned in the front-rear direction. The rear end portion side of the outer peripheral surface of the inner tube portion 302 is slightly reduced in diameter in accordance with the shape of the inner wall surface of the main cylinder 223.

As shown in fig. 8, a pair of groove portions 307 extending in the front-rear direction are formed on the outer peripheral surface of the inner tube portion 302. A pair of grooves 307 are formed at a constant depth above and below the outer peripheral surface of the inner tube 302. The pair of grooves 307 extend to the rear surface of the annular coupling portion 305 and extend to the through holes 306 arranged vertically.

As shown in fig. 7, a tubular guide cylinder 225 protruding forward from the central portion of the rear wall portion thereof is provided in a bottomed tubular main cylinder 223 that opens forward. The guide cylinder 225 is formed in a bottomed cylinder shape that is open at the front and closed at the rear. The front end portion of the guide cylinder 225 is located further rearward than the front end portion of the main cylinder 223.

The guide tube 225 is formed in a ring shape at its bottom, and has a fitting tube portion 216 provided in the cylinder portion 215. The distal end of the fitting tube 216 protrudes into the guide tube 225. The guide tube 225 is disposed coaxially with the fitting tube portion 216. An annular recess 225a is formed in the outer peripheral surface of the rear end portion of the guide tube 225.

The master piston 222 includes: a piston main body portion 222a which opens rearward and into which a guide cylinder 225 is inserted; an inner lip 222b provided at a rear end portion of the piston main body 222a and in sliding contact with an outer wall surface of the guide cylinder 225; a lip coupling portion 222c protruding radially outward from a rear end portion of the piston main body portion 222 a; and a pair of front and rear outer lips 222d which are provided so as to be connected to the radially outer side of the lip connecting portion 222c and which are in sliding contact with the inner wall surface of the main cylinder 223.

The piston main body 222a is formed in a closed-ended tubular shape that opens rearward and closes forward. The inner diameter of the piston main body portion 222a is formed slightly larger than the outer diameter of the guide cylinder 225. The front end 271 of the piston main body 222a is engaged with the trigger 221 by abutting against the trigger 221 from behind the trigger 221 (see fig. 6).

The master piston 222 can also be described as follows. The master piston 222 includes: a sliding portion 270 disposed inside the main cylinder 223 so as to be movable in the front-rear direction; and a piston main body portion (projection) 222a that projects forward from the sliding portion 270 toward the outside of the main cylinder 223, and whose tip 271 is coupled with the trigger portion 221. The sliding portion 270 includes an inner lip 222b, a lip connecting portion 222c, and an outer lip 222d.

An annular inner lip 222b protruding inward in the radial direction thereof and slidably contacting the outer wall surface of the guide cylinder 225 is formed at the rear end portion of the piston main body 222 a. Thereby, sealability is ensured between the inner lip 222b and the outer wall surface of the guide cylinder 225. The inboard lip 222b reaches the recess 25a when the master piston 222 is in the rearmost position.

If the inner lip 222b reaches the recess 225a of the guide cylinder 25, a plurality of gaps are formed between the inner lip 222b and the recess 225 a. Through this gap, the inside of the main cylinder 223 communicates with the gap between the inner peripheral surface of the piston main body portion 222a and the outer wall surface of the guide cylinder 225. Thereby, the inside of the main cylinder 223 communicates with the inside of the fitting cylinder portion 216 through the inside of the guide cylinder 225.

The lip connecting portion 222c is formed in an annular shape connecting the inner lip 222b and the outer lip 222d in the radial direction. The front surface of the lip connecting portion 222c is a flat surface. The outer lip 222d is formed so as to have a pair of front and rear portions that expand in diameter from the outer Zhou Duanchao of the lip connecting portion 222c to the front and rear sides, and is in sliding contact with the inner wall surface of the main cylinder 223. Thereby, sealability is ensured between the outer lip 222d and the inner wall surface of the main cylinder 223.

When the trigger portion 221 is located at the forward-most swing position, the master piston 222 is located at the forward-most position corresponding to the trigger portion 221 located at the forward-most swing position. At this time, the main piston 222 closes the first vent hole 223b formed in the main cylinder 223 between the front and rear pair of outer lips 222 d. Then, when the main piston 222 is moved rearward from the forefront position by a predetermined amount by the rearward swing of the trigger portion 221, the main piston 222 opens the first vent hole 223b.

Thus, the first vent hole 223b is opened to the outside of the trigger type liquid ejector 201 through the inside of the main cylinder 223. The first vent hole 223b communicates with the inside of the container body a via various gaps and various vent holes (the first gap S1, the second vent hole 215a, the second gap S2, and the third vent hole 210 a). This allows the inside of the container body a to which the liquid is sprayed to be replaced with air. The first gap S1 is an annular gap formed between the inner peripheral surface of the cylinder portion 215 and the outer peripheral surface of the main cylinder 223. The second ventilation hole 215a is a through hole formed in the peripheral wall of the cylinder tube 215, and extends downward from the lower portion of the first gap S1. The second gap S2 is a gap formed between the lower surface of the cylinder tube 215 and the upper surface of the inner tube-side flange 210A of the longitudinal supply tube 210, and communicates with the lower end of the second vent hole 215 a. As shown in fig. 6, the mounting cover 211 is locked to the inner cylinder side flange 210A. The third vent hole 210A is a through hole that penetrates the inner cylinder-side flange 210A vertically, and communicates the second gap S2 with the inside of the container body a.

The regulating member 300 includes a regulating piece 303, and the regulating piece 303 abuts against the lip coupling portion 222c in the front-rear direction to regulate the main piston 222 from coming off in the front direction. As shown in the rear view of the regulating member 300 of fig. 8, a plurality of regulating pieces 303 are provided at intervals in the circumferential direction of the inner tube portion 302 (in the present embodiment, two regulating pieces are provided at intervals of 180 ° centering on the axis O2). As shown in fig. 7, the restricting piece 303 protrudes rearward from the inner peripheral surface side of the rear end portion of the inner tube portion 302. The outer peripheral surface side of the rear end portion of the restriction piece 303 is tapered rearward. The rear end surface of the restricting piece 303 is a plane parallel to the lip connecting portion 222c, and faces the lip connecting portion 222c in the front-rear direction.

(Action of trigger type liquid ejector)

Next, a case where the trigger type liquid ejector 201 configured as described above is used will be described. The trigger type liquid ejector 201 fills each portion of the trigger type liquid ejector 201 with liquid by a plurality of operations of the trigger portion 221, and is in a state capable of sucking the liquid into the longitudinal supply tube portion 210.

After removing the stopper T, the user operates to pull the trigger 221 rearward against the force of the piston urging member 224. Then, the master piston 222 moves rearward from the forefront position, and the inside of the master cylinder 223 is pressurized. Thereby, the liquid in the main cylinder 223 is supplied to the longitudinal supply cylinder 210. Then, the liquid supplied to the longitudinal supply tube portion 210 presses the first check valve 213 downward, and lifts the second check valve 214.

Thereby, the liquid in the longitudinal supply tube portion 210 can be supplied to the accumulation space 241 of the accumulation cylinder 240 through the inside of the connection tube portion 230, and the accumulation space 241 can be pressurized. Accordingly, with the pressurization of the accumulation space 241, the accumulation plunger 250 can be moved rearward from the maximum advanced position against the urging force of the plunger urging member 251, and the liquid can be accumulated (filled) in the accumulation space 241.

By moving the accumulation plunger 250 rearward, the liquid in the accumulation space 241 having an increased pressure can be guided to the injection hole 204 through the injection tube 260. Further, the liquid can be ejected from the ejection hole 204 toward the front. In this way, each time the trigger 221 is pulled backward, the liquid can be injected from the injection hole 204, and the accumulation plunger 250 can be moved backward to accumulate the liquid in the accumulation space 241.

Then, when the trigger 221 is released, the main piston 222 is returned to the front by the elastic restoring force (urging force) of the piston urging member 224 in the main cylinder 223, and thus, the trigger 221 is returned to the front in response to this. Accordingly, the pressure in main cylinder 223 can be reduced to a pressure lower than the pressure in container a, and therefore, first check valve 213 can be raised while second check valve 214 is kept closed. Therefore, the liquid in the container body a can be sucked into the longitudinal supply tube portion 210 and introduced into the main cylinder 223. This makes it possible to prepare for the next injection.

When the rearward operation of the trigger 221 is stopped, the liquid supplied to the accumulation space 241 in the longitudinal supply tube 210 and the connection tube 230 is stopped, and the accumulation plunger 250 starts to move forward toward the most advanced position by the biasing force of the plunger biasing member 251. At this time, the outflow of the liquid from the accumulation space 241 into the longitudinal supply tube portion 210 is restricted by the second check valve 214.

This can guide the liquid stored in the storage space 241 to the injection hole 204 through the inside of the injection tube 260, and can continuously inject the liquid forward through the injection hole 204. In this way, not only when the trigger 221 is pulled backward, but also when the trigger 221 is not operated, the liquid can be ejected, and the liquid can be ejected continuously.

According to the trigger type liquid injector 201 having the above-described structure, when the trigger mechanism 220 is operated and the trigger portion 221 is moved rearward, the main piston 222 retreats, so that the main cylinder 223 is pressurized, and the liquid in the main cylinder 223 flows from the inside of the longitudinal supply tube portion 210 toward the injection hole 204. This allows the liquid to be ejected forward through the ejection hole 204 of the nozzle member 203. Further, when the operation of the trigger mechanism 220 is stopped, since the piston urging member 224 that urges the main piston 222 forward is provided in the main cylinder 223, the main piston 222 advances together with the trigger portion 221, and the inside of the main cylinder 223 is depressurized, so that the liquid can be sucked from the container a. Here, the restricting member 300 is fitted to the main cylinder 223, and the restricting member 300 directly restricts the forward falling of the main piston 222. Therefore, even in a state before the trigger portion 221 is assembled, the forward movement of the master piston 222 can be reliably restricted.

That is, if the force of the piston urging member 224 is increased to enhance the suction of the liquid into the main cylinder 223, the main piston 222 is intended to advance. In the case where the advance of the main piston 222 is restricted only by the trigger portion 221, the advance of the main piston 222 cannot be completely restricted because the assembly accuracy and/or deformation of the trigger portion 221 are dependent. If the main piston 222 is advanced to a position that is advanced more than the designed forward-most position, leakage or the like may occur. If the master piston 222 is advanced to a position that is advanced more than the designed forward-most position, the master piston 222 may not be retracted to the designed rearward-most position or the like when the trigger portion 221 is pulled. When the outer lip 222d passes through the first vent hole 223b for air replacement by the advance of the main piston 222, the liquid is immersed in the first vent hole 23b, and the immersed liquid may be sprayed in a reverse flow when the trigger portion 21 is pulled. In order to suppress such a possibility, in the present embodiment, the annular restriction member 300 is fitted to the flange 223a of the main cylinder 223 to directly press the main piston 222, thereby reliably restricting the progress. Further, since the main cylinder 223, the piston urging member 224, the main piston 222, and the regulating member 300 can be assembled in advance by unitizing the regulating member 300, the assembly of the main cylinder 223, the piston urging member 224, the main piston 222, and the regulating member 300 to the injector body 202 is facilitated.

As described above, the trigger type liquid ejector 201 of the present embodiment includes: an ejector main body 202 attached to a container body a containing a liquid; and a nozzle member 203 which is disposed on the front side of the injector body 202 and which is formed with an injection hole 204 that injects liquid toward the front. The injector body 202 has: a longitudinal supply tube portion 210 that extends in the up-down direction and sucks the liquid in the container body a; a trigger mechanism 220 having a trigger portion 221 disposed in front of the longitudinal supply tube portion 210 so as to be movable rearward in a state of being biased forward, the trigger mechanism 220 causing liquid to flow from within the longitudinal supply tube portion 210 toward the injection hole 204 side by rearward movement of the trigger portion 221; a storage cylinder 240 for supplying the liquid passing through the longitudinal supply tube 210 from the main cylinder 223 to the inside by the rearward movement of the trigger 221; and an accumulation plunger 250 disposed in the accumulation cylinder 240 so as to be movable in the axial direction along the central axis of the accumulation cylinder 240, and biased toward one side in the axial direction as the liquid is supplied into the accumulation cylinder 240. The trigger mechanism 220 includes: a main piston 222 that moves forward and backward with the movement of the trigger 221; a main cylinder 223 that pressurizes and depressurizes the inside as the main piston 222 moves, and the inside communicates with the inside of the longitudinal supply cylinder 210; a piston urging member 224 which is disposed inside the main cylinder 223 and urges the main piston 222 forward; and a regulating member 300 which is fitted to the main cylinder 223 and regulates the main piston 222 from coming off forward. According to this structure, the advance of the master piston 222 can be restricted without depending on the assembled state of the trigger portion 221.

The trigger type liquid ejector 201 of the present embodiment can also be described as follows. The trigger type liquid ejector 201 of the present embodiment includes: an ejector main body 202 attached to a container body a containing a liquid; and a nozzle member 203 which is attached to the injector body 202 and is formed with an injection hole 204 that injects liquid. The injector body 202 includes: a longitudinal supply tube portion 210 that sucks the liquid in the container body a; a trigger mechanism 220 having a trigger portion 221 disposed so as to be movable rearward in a state of being biased forward, wherein the trigger mechanism 220 causes liquid to flow from the inside of the longitudinal supply tube portion 210 toward the injection hole 204 side by rearward movement of the trigger portion 221; a storage cylinder 240 for supplying the liquid passing through the longitudinal supply tube 210 to the inside by the rearward movement of the trigger 221; and an accumulation plunger 250 disposed in the accumulation cylinder 240 so as to be movable in the axial direction along the central axis of the accumulation cylinder 240, and biased toward one side in the axial direction as liquid is supplied into the accumulation cylinder 240. The trigger mechanism 220 includes: a main cylinder 223 which is opened forward and communicates with the inside of the longitudinal supply cylinder 210 rearward; a master piston 222 having a sliding portion 270 movably disposed in the front-rear direction inside a master cylinder 223, and a piston main body portion (protrusion portion) 222a protruding forward from the sliding portion 270 toward the outside of the master cylinder 223 and having a front end portion 271 coupled to the trigger portion 221; a biasing member (piston biasing member) 224 that biases the trigger 221 forward; and a regulating member 300 which is fitted to the main cylinder 223 and regulates the main piston 222 from coming off forward. According to this structure, the advance of the master piston 222 can be restricted without depending on the assembled state of the trigger portion 221. The urging member (piston urging member) 224 is disposed inside the main cylinder 223.

In the present embodiment, a guide cylinder 225 for guiding the master piston 222 in the front-rear direction is provided inside the master cylinder 223. The master piston 222 includes: an inner lip 222b in sliding contact with an outer wall surface of the guide cylinder 225; an outer lip 222d in sliding contact with an inner wall surface of the main cylinder 223; and a lip connecting portion 222c connecting the inner lip 222b and the outer lip 222 d. The regulating member 300 includes a regulating piece 303, and the regulating piece 303 abuts against the lip coupling portion 222c in the front-rear direction to regulate the main piston 222 from coming off in the front direction. According to this configuration, the restriction piece 303 of the restriction member 300 directly abuts against the lip connecting portion 222c connecting the inner lip 222b and the outer lip 222d of the main piston 222 in the front-rear direction, so that the advance of the main piston 222 can be restricted without applying deformation to the inner lip 222b and the outer lip 222 d. Therefore, the slidability and sealability of the master piston 222 with respect to the guide cylinder 225 and the master cylinder 223 can be ensured.

In the present embodiment, the restricting member 300 includes: an outer cylinder 301 externally fitted to the main cylinder 223; an inner cylinder 302 that is provided in connection with the outer cylinder 301, is inserted into the inside of the main cylinder 223, and is disposed with a gap therebetween with respect to the entire circumference of the inner wall surface of the main cylinder 223; and a pair of groove portions 307 formed on the outer peripheral surface of the inner tube portion 302 and extending in the front-rear direction. With this structure, the outer tube 301 of the restriction member 300 is fitted to the main cylinder 223. Therefore, the attachment of the restriction member 300 to the main cylinder 223 becomes easy. The inner cylinder 302 of the regulating member 300 is inserted into the main cylinder 223, is disposed with a gap therebetween with respect to the entire circumference of the inner wall surface of the main cylinder 223, and has a pair of grooves extending in the front-rear direction formed in the outer circumferential surface of the inner cylinder 302. Therefore, the inner cylinder 302 can be inserted into a predetermined position in the main cylinder 223 without depending on the dimensional accuracy of the inner wall surface of the main cylinder 223, and the advance of the main piston 222 can be restricted.

In the present embodiment, the piston biasing member 224 is a metal spring, and the injector body 202 includes: a storage cylinder 240 for supplying the liquid passing through the longitudinal supply tube 210 from the main cylinder 223 to the inside by the rearward movement of the trigger 221; an accumulation plunger 250 disposed in the accumulation cylinder 240 so as to be movable in an axial direction along a central axis of the accumulation cylinder 240, and biased toward one side in the axial direction in response to supply of the liquid into the accumulation cylinder 240; a first check valve 213 that cuts off communication in the longitudinal supply cylinder portion 210 passing between the inside of the container body a and the inside of the main cylinder 223 when the inside of the main cylinder 223 is pressurized, and allows communication in the longitudinal supply cylinder portion 210 between the inside of the container body a and the inside of the main cylinder 223 when the inside of the main cylinder 223 is depressurized; and a second check valve 214 that allows communication in the longitudinal supply tube 210 between the inside of the accumulation cylinder 240 and the inside of the main cylinder 223 to pass when the inside of the main cylinder 223 is pressurized, and cuts off communication in the longitudinal supply tube 210 between the inside of the accumulation cylinder 240 and the inside of the main cylinder 223 when the inside of the main cylinder 223 is depressurized. According to this structure, the piston biasing member 224 is a metal spring, so that the suction of the liquid into the main cylinder 223 can be enhanced. Further, the liquid can be injected through the injection hole 204 while the liquid is supplied from the main cylinder 223 into the accumulation cylinder 240 through the inside of the longitudinal supply tube portion 210 by the first check valve 213 and the second check valve 214, and the inside of the accumulation cylinder 240 can be pressurized. Therefore, the accumulation plunger 250 can be pushed toward one side in the axial direction against the forward biasing force, and the accumulation plunger 50 can be moved toward one side in the axial direction while ejecting the liquid. Therefore, each time the trigger unit 221 is pulled, the accumulation plunger 250 can be moved to one side in the axial direction, and the liquid can be injected while accumulating (filling) the liquid in the accumulation cylinder 240. After filling the storage cylinder 240 with the liquid, when the operation of the trigger 221 is stopped, the supply of the liquid into the storage cylinder 240 through the longitudinal supply tube 210 is stopped, but the storage plunger 250 starts to return to the other side in the axial direction. This allows the liquid filled in the accumulation cylinder 240 to be pushed out from the accumulation cylinder 240 toward the injection hole 204, and to be injected from the injection hole 4. Thus, continuous ejection of liquid can be performed.

Although the second embodiment of the present invention has been described above, the second embodiment is presented as an example of the present invention and is not intended to limit the scope of the invention. The embodiments of the present invention can be implemented in various other modes, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. The embodiments and modifications thereof include, for example, those that can be easily understood by those skilled in the art, those that are substantially the same, those that are equivalent in scope, and the like.

For example, a modification as shown in fig. 9 may be employed. The regulating member 300 shown in fig. 9 abuts against the front side outer lip 22d of the front-rear pair of outer lips 222d in the front-rear direction, thereby regulating the forward drop of the master piston 22. As shown in the rear view of fig. 10, the regulating member 300 has a structure in which a rear end portion formed continuously over the entire circumference of the inner tube 302 doubles as the regulating piece 303. Even with the above configuration, the advance of the master piston 22 can be restricted without depending on the assembled state of the trigger portion 221. The restricting member 300 may have the following structure: the regulating piece 303 shown in fig. 7 is separated radially inward from the inner peripheral surface of the outer lip 222d, and abuts only the lip connecting portion 222 c. The restricting member 300 may not be in the form of a ring.

The accumulation cylinder 240 and the accumulation plunger 250 may not be provided. The trigger type liquid ejector 201 may not be based on continuous ejection.

In addition, the components in the above-described embodiments may be appropriately replaced with known components within a range not departing from the gist of the present invention.

Industrial applicability

Claims

1. A trigger type liquid ejector, comprising:

An ejector main body attached to a container body containing a liquid; and

A nozzle member mounted to the injector body and formed with an injection hole for injecting a liquid,

The injector body is provided with:

A longitudinal supply tube portion that sucks the liquid in the container body;

a trigger mechanism having a trigger portion disposed so as to be movable rearward in a state of being biased forward, the trigger mechanism causing liquid to flow from within the longitudinal supply tube portion toward the injection hole side by rearward movement of the trigger portion;

An accumulation cylinder for supplying the liquid passing through the longitudinal supply tube portion to the inside by the rearward movement of the trigger portion; and

An accumulation plunger disposed in the accumulation cylinder so as to be movable in an axial direction along a central axis of the accumulation cylinder, the accumulation plunger being movable toward one side in the axial direction and biased toward the other side as liquid is supplied into the accumulation cylinder,

The trigger mechanism is provided with:

a main cylinder body which is opened forward and communicates with the inside of the longitudinal supply cylinder portion rearward;

A main piston having a sliding portion disposed in the main cylinder so as to be movable in a front-rear direction, and a protrusion protruding forward from the sliding portion toward the outside of the main cylinder and having a front end portion connected to the trigger portion; and

And a biasing member that is inserted into the protrusion of the main piston and biases the trigger portion forward.

2. The trigger type liquid ejector according to claim 1, wherein,

The trigger type liquid injector includes a spring seat attached to an opening in front of the main cylinder and receiving a rear end of the biasing member.

3. The trigger type liquid ejector according to claim 2, wherein,

The spring seat includes a pair of side wall portions sandwiching the biasing member in the left-right direction.

4. A trigger type liquid sprayer according to claim 2 or 3, wherein,

The spring seat includes:

An inner cylinder portion inserted into the main cylinder; and

And a receiving portion formed inside the inner tube portion and receiving a rear end of the urging member.