Trigger type liquid jet device

Abstract

To provide a trigger type liquid jet device excellent in impact resistance while suppressing occurrence of a sink.SOLUTION: A storage cylinder 40 is provided to project rearward from a vertical supply cylinder section 10 above the vertical supply cylinder section. The vertical supply cylinder section has an outer cylinder 11 formed integrally with the storage cylinder and an inner cylinder 12 disposed inside the outer cylinder. The inner cylinder has a large diameter section 12a opened into a mouth part of a container body A, a small diameter section 12b which is provided inside in the radial direction of the large diameter section and into which liquid in the container body is supplied, and an annular connection section 12c for connecting the inner peripheral surface of the large diameter section to the outer peripheral surface of the small diameter section in the radial direction. In the small diameter section, a pipe fitting cylinder 12h is formed to project further downward than the annular connection section. In the rear section of the pipe fitting cylinder, a plurality of ribs 16 for integrally connecting the pipe fitting cylinder and the large diameter section in the radial direction is formed at intervals in a circumferential direction. The plurality of ribs is formed into a plate shape in which front and rear surfaces of the ribs face the circumferential direction.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] Conventionally, as shown in, for example, Patent Document 1 below, by operating a trigger part, the liquid sucked up from inside the container body through the vertical supply cylinder part is stored in a storage cylinder extending in the front-rear direction while moving a storage plunger backward in the storage cylinder, and is ejected to the outside from an ejection hole. Then, when the operation of the trigger part is stopped, by moving the storage plunger forward for restoration, a trigger-type liquid ejector that ejects the liquid in the storage cylinder to the outside from the ejection hole is known. The vertical supply cylinder part extends downward from the storage cylinder and is formed in a double-cylindrical shape having an outer cylinder and an inner cylinder. The inner cylinder includes a large-diameter part that opens into the mouth part of the container body, a small-diameter part provided inside the large-diameter part in the radial direction and through which the liquid in the container body is supplied to the inside, and an annular connecting part that connects the inner peripheral surface of the large-diameter part and the outer peripheral surface of the small-diameter part in the radial direction. Generally, the storage cylinder is provided above the vertical supply cylinder part so as to protrude rearward from the vertical supply cylinder part, and an impact force is likely to be applied to the rear part of the storage cylinder, such as during dropping. In this case, a load in a direction of falling backward with the upper end part is likely to be transmitted to the vertical supply cylinder part extending downward from the storage cylinder. Therefore, a locally large load is applied to the rear part of the annular connecting part of the inner cylinder of the vertical supply cylinder part, and there is a risk of cracks or the like occurring starting from this part. In order to solve such a problem, in the trigger-type liquid ejector described in Patent Document 1 below, for example, a connecting reinforcement part that integrally connects the pipe fitting cylinder and the large-diameter part in the radial direction is formed at the rear part of the pipe fitting cylinder that protrudes below the annular connecting part among the small-diameter parts of the inner cylinder.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a conventional trigger-type liquid ejector, sink marks occurred in the connecting and reinforcing parts during the molding of the inner cylinder, and it was impossible to accurately mold large-diameter parts and the like, and there was a risk that the mounting strength of the inner cylinder to the outer cylinder would decrease.

[0005] The present invention provides a trigger-type liquid ejector that suppresses the occurrence of sink marks and has excellent impact resistance.

Means for Solving the Problems

[0006] A trigger-type liquid ejector according to one aspect of the present invention includes an ejector body attached to a container body in which a liquid is stored, and a nozzle member attached to the ejector body and having an ejection hole for ejecting the liquid. The ejector body has a vertical supply cylinder portion for sucking up the liquid in the container body, and a trigger portion disposed so as to be movable rearward in a forward-biased state. By the rearward movement of the trigger portion, a trigger mechanism for causing the liquid to flow from inside the vertical supply cylinder portion toward the ejection hole side, and a storage cylinder extending in the front-rear direction into which the liquid that has passed through the vertical supply cylinder portion is supplied by the rearward movement of the trigger portion. A storage plunger disposed movably in the front-rear direction in the storage cylinder, and moving rearward as the liquid is supplied into the storage cylinder and biased forward. The storage cylinder is provided above the vertical supply cylinder portion so as to project rearward from the vertical supply cylinder portion. The vertical supply cylinder portion includes an outer cylinder formed integrally with the storage cylinder, and an inner cylinder disposed inside the outer cylinder. The inner cylinder includes a large-diameter portion opening into the mouth portion of the container body, a small-diameter portion provided radially inside the large-diameter portion and into which the liquid in the container body is supplied, and an annular connecting portion connecting the inner peripheral surface of the large-diameter portion and the outer peripheral surface of the small-diameter portion in the radial direction. A pipe fitting cylinder protruding downward from the annular connecting portion is formed in the small-diameter portion. A plurality of ribs integrally connecting the pipe fitting cylinder and the large-diameter portion in the radial direction are formed at intervals in the circumferential direction at the rear portion of the pipe fitting cylinder. The plurality of ribs are formed in a plate shape with the front and rear surfaces facing the circumferential direction.

[0007] Since ribs integrally connecting the large-diameter portion of the inner cylinder and the pipe fitting cylinder in the radial direction are formed at the rear portion of the pipe fitting cylinder, the rigidity of the rear portions of the large-diameter portion, the annular connecting portion, and the pipe fitting cylinder can be increased. Thereby, for example, even if an impact force due to dropping or the like is applied to the storage cylinder and a load in a direction in which the upper end portion tilts rearward is transmitted to the vertical supply cylinder portion, deformation of the rear portions of the large-diameter portion, the annular connecting portion, and the pipe fitting cylinder can be suppressed, and generation of cracks or the like starting from this portion can be suppressed. Therefore, the impact resistance of the trigger-type liquid ejector can be improved. Since the ribs are formed in a plate shape with the front and back surfaces facing the circumferential direction, the thickness of the ribs can be reduced, it becomes possible to suppress the occurrence of sink marks during molding, the inner cylinder can be accurately molded, and it is possible to prevent the mounting strength of the inner cylinder to the outer cylinder from decreasing. Since a plurality of plate-shaped ribs are provided at intervals in the circumferential direction, it is possible to suppress the difficulty of increasing the rigidity of the rear portions of the large-diameter portion, the annular connecting portion, and the pipe fitting cylinder respectively due to forming the ribs in a plate shape.

[0008] The plurality of ribs may protrude downward from the lower surface of the annular connecting portion.

[0009] Since a plurality of ribs protrude downward from the lower surface of the annular connecting portion, it is possible to surely increase the rigidity of the rear portions of the large-diameter portion, the annular connecting portion, and the pipe fitting cylinder respectively.

[0010] In the vertical supply cylinder portion, a recovery passage disposed at the rear of the vertical supply cylinder portion, extending downward from the storage cylinder and having a lower end opening closed from below by the annular connecting portion, a communication path extending in the circumferential direction from the lower end portion of the recovery passage, and a communication opening disposed in front of the recovery passage and communicating the communication path with the inside of the container body are provided. The recovery passage may communicate with the inside of the storage cylinder when the storage plunger moves backward.

[0011] When the storage plunger moves backward, since the recovery passage communicates with the inside of the storage cylinder, when the liquid is about to be excessively supplied into the storage cylinder, by communicating the inside of the storage cylinder with the inside of the container body through the recovery passage, the communication path, and the communication opening, it becomes possible to recover the liquid into the container body, and it is possible to suppress the excessive supply of the liquid into the storage cylinder. As described above, since the rigidity of the rear portion of the annular connecting portion is increased by the ribs and the occurrence of cracks and the like can be suppressed, even when a load in a direction in which the upper end portion of the vertical supply cylinder portion falls backward is applied, the configuration in which the lower end opening of the recovery passage communicates with the communication opening through the communication path can be surely maintained.

Advantages of the Invention

[0012] According to the above aspect of the present invention, it is possible to provide a trigger-type liquid ejector that suppresses the occurrence of sink marks and has excellent impact resistance.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Mode for Carrying Out the Invention

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the trigger-type liquid ejector 1 of the present embodiment includes an ejector body 2 and a nozzle member 3. Each component of the trigger-type liquid ejector 1 is a molded product made of synthetic resin unless otherwise specified.

[0015] The ejector body 2 is attached to a container body A in which a liquid is stored via a mounting cap 30. The ejector body 2 mainly includes a vertical supply cylinder portion 10, a connection cylinder portion 20, a storage cylinder 40, a storage plunger 50, a plunger biasing member 60, an injection cylinder portion 70, a trigger mechanism 80, a ball valve 90, and a storage valve 91.

[0016] In the present embodiment, the central axis of the vertical supply cylinder portion 10 is referred to as the axis O1. The side of the container body A is the lower side along the axis O1, the opposite side is the upper side, and the direction along the axis O1 is the vertical direction. The direction intersecting the axis O1 as viewed from the vertical direction is the radial direction, and the direction orbiting around the axis O1 as viewed from the vertical direction is the circumferential direction. One direction in the radial direction as viewed from the vertical direction is the front-rear direction, and the direction orthogonal to the front-rear direction as viewed from the vertical direction is the left-right direction. The central axis of the storage cylinder 40 is referred to as the axis O2. The axis O2 extends in the front-rear direction.

[0017] The vertical supply cylinder portion 10 extends in the vertical direction and sucks up the liquid in the container body A. The vertical supply cylinder portion 10 is attached to the container body A by the attachment cap 30. An upper portion of a pipe 10a that extends in the vertical direction and sucks up the liquid from the container body A is fitted to the vertical supply cylinder portion 10. The axis O1 of the vertical supply cylinder portion 10 is located behind the central axis of the container body A. The vertical supply cylinder portion 10 is formed in a double cylinder shape having an outer cylinder 11 and an inner cylinder 12.

[0018] The connection cylinder portion 20 extends forward from the upper end portion of the vertical supply cylinder portion 10. Both front and rear ends of the connection cylinder portion 20 in the front-rear direction are open. The rear end opening of the connection cylinder portion 20 opens into the vertical supply cylinder portion 10. A closing plug 100 is tightly fitted into the front end opening of the connection cylinder portion 20.

[0019] The storage cylinder 40 is provided above the vertical supply cylinder portion 10. The rear portion of the storage cylinder 40 protrudes rearward from the vertical supply cylinder portion 10. The rear end portion of the storage cylinder 40 is located behind the attachment cap 30. The front portion of the storage cylinder 40 protrudes forward from the vertical supply cylinder portion 10. The lower end portion of the storage cylinder 40 is integrally formed with the upper end portions of the vertical supply cylinder portion 10 and the connection cylinder portion 20, respectively. A supply hole 41 that penetrates vertically and communicates the inside of the storage cylinder 40 and the inside of the connection cylinder portion 20 is formed at the lower end portion of the front end portion of the storage cylinder 40. The supply hole 41 is located behind the closing plug 100. Inside the storage cylinder 40 (a storage space 40a described later), the liquid that has passed through the vertical supply cylinder portion 10 and the connection cylinder portion 20 is supplied through the supply hole 41 by the rearward movement of the trigger portion 81.

[0020] The storage plunger 50 is disposed in the storage cylinder 40 so as to be movable in the front-rear direction. The storage plunger 50 moves rearward as the liquid is supplied to the storage space 40a. The storage plunger 50 blocks the communication between the vertical supply cylinder portion 10 through the connection cylinder portion 20 and the ejection hole 4, and allows the communication between the vertical supply cylinder portion 10 through the connection cylinder portion 20 and the ejection hole 4 when it moves rearward. Note that the central axis of the ejection hole 4 is located above the axis O2. The storage plunger 50 includes a sliding cylinder portion 50a that slidably and tightly contacts the inner peripheral surface of the storage cylinder 40 in the front-rear direction over the entire circumference. A supply hole 41 is opened in a portion (hereinafter referred to as the storage space 40a) located in front of the sliding cylinder portion 50a within the storage cylinder 40. The liquid from the vertical supply cylinder portion 10 is stored in the storage space 40a. The storage space 40a expands as the storage plunger 50 moves rearward with the supply of the liquid. In the storage plunger 50, a support portion 50b that protrudes radially outward and continuously extends over the entire circumference is formed in a portion located rearward of the sliding cylinder portion 50a.

[0021] The plunger biasing member 60 biases the rearward-moved storage plunger 50 forward. In the present embodiment, the plunger biasing member 60 biases the storage plunger 50 forward before the storage plunger 50 moves rearward. The plunger biasing member 60 is, for example, a metal coil spring. The front end portion of the plunger biasing member 60 abuts against the support portion 50b of the storage plunger 50 from the rear of the support portion 50b. The rear end portion of the plunger biasing member 60 is fitted into the rear end portion of the storage cylinder 40. The injection cylinder portion 70 extends forward from the storage cylinder 40. The injection cylinder portion 70 communicates with the vertical supply cylinder portion 10 through the storage space 40a, the supply hole 41, and the connection cylinder portion 20.

[0022] The trigger mechanism 80 includes a trigger portion 81, a main cylinder 82, a main piston 83, and a biasing member 84. The trigger mechanism 80 causes the liquid to flow from within the vertical supply cylinder portion 10 through the connection cylinder portion 20 toward the ejection hole 4 side by moving the trigger portion 81 rearward.

[0023] The trigger portion 81 is disposed in front of the vertical supply cylinder portion 10 so as to be movable rearward in a forward-biased state. The trigger portion 81 extends in the vertical direction and is disposed below the injection cylinder portion 70. The trigger portion 81 is provided in front of the main piston 83 and the main cylinder 82 and straddles the main piston 83 and the main cylinder 82 in the vertical direction. The upper end portion of the trigger portion 81 is pivotally supported by the nozzle member 3 so as to be swingable in the front-rear direction. A stopper T is provided in the front-rear direction gap between the trigger portion 81 and the main cylinder 82. The stopper T regulates the rearward movement of the trigger portion 81 by abutting against both the trigger portion 81 and the main cylinder 82. The stopper T is detachably provided with respect to the gap. Note that the stopper T may not be provided.

[0024] Here, between the lower end portion of the connection cylinder portion 20 and the upper end portion of the mounting cap 30, there is provided a bottomed cylindrical main cylinder mounting cylinder portion 110 that protrudes forward from the vertical supply cylinder portion 10, opens forward, and has a closed rear end opening. The main cylinder 82 is fitted within the main cylinder mounting cylinder portion 110. The main cylinder 82 is formed in a bottomed cylindrical shape that opens forward and has a closed rear end opening. A communication passage 2a that communicates between the inside of the main cylinder 82 and the inside of the vertical supply cylinder portion 10 is formed in the bottom wall of each of the main cylinder 82 and the main cylinder mounting cylinder portion 110.

[0025] The main piston 83 is fitted movably back and forth in the main cylinder 82. The main piston 83 moves back and forth in conjunction with the back-and-forth movement of the trigger part 81. Inside the main cylinder 82, pressure is increased and decreased as the main piston 83 moves back and forth. The main piston 83 is formed in a toped cylindrical shape that opens toward the rear and has its front end opening blocked. The front end part of the main piston 83 is connected to the trigger part 81. The main piston 83 is biased forward by the biasing force of the biasing member 84 via the trigger part 81.

[0026] The biasing member 84 is, for example, a metal coil spring. The biasing member 84 is arranged coaxially with the main piston 83 and the main cylinder 82, and biases the trigger part 81, to which the front end part of the main piston 83 is connected, forward. The biasing member 84 is arranged between the spring receiver 130 attached to the front end opening of the main cylinder 82 and the trigger part 81. The biasing member 84 is provided at a position where it does not come into contact with the liquid. Note that the biasing member 84 may be made of, for example, resin, or may be formed of other elastic materials.

[0027] The ball valve 90 and the storage valve 91 are provided in the vertical supply cylinder part 10. In the vertical supply cylinder part 10, a communication passage 2a opens at a portion located between the ball valve 90 and the storage valve 91.

[0028] The ball valve 90 shuts off the communication between the inside of the container body A through the vertical supply cylinder part 10 and the inside of the main cylinder 82 when the pressure inside the main cylinder 82 increases, and allows the communication between the inside of the container body A through the vertical supply cylinder part 10 and the inside of the main cylinder 82 by displacing upward when the pressure inside the main cylinder 82 decreases, and is a check valve. The storage valve 91 is arranged above the ball valve 90. The storage valve 91 allows the supply of liquid from the inside of the vertical supply cylinder part 10 to the storage space 40a through the connection cylinder part 20, and is a check valve that restricts the outflow of liquid from the storage space 40a to the inside of the vertical supply cylinder part 10 through the connection cylinder part 20.

[0029] The nozzle member 3 has a jet hole 4 for jetting a liquid and is attached to the injector body 2. The nozzle member 3 includes a mounting cylinder portion 120 externally fitted to the injection cylinder portion 70 from the front of the injection cylinder portion 70, and a nozzle cylinder 122 attached to the front end portion of the mounting cylinder portion 120. The nozzle cylinder 122 is formed with a jet hole 4 that opens forward and jets the liquid forward.

[0030] The mounting cap 30 is formed in a toped cylindrical shape having an annular top wall. The lower end portion of the vertical supply cylinder portion 10 is inserted inside this top wall. A regulating cylinder 31 that protrudes upward is formed at the inner peripheral edge portion of the top wall. The upper end opening edge of the regulating cylinder 31 is in contact with or close to the outer surface of the injector body 2 (in the illustrated example, the lower end portion of the outer peripheral surface of the main cylinder mounting cylinder portion 110) in the vertical direction. Note that the regulating cylinder 31 may not be provided on the mounting cap 30.

[0031] Here, in the present embodiment, the outer cylinder 11 of the vertical supply cylinder portion 10 has a large diameter portion 11a, a small diameter portion 11b, and an annular connecting portion 11c. The small diameter portion 11b is disposed coaxially with the axis O1. The small diameter portion 11b is provided above the large diameter portion 11a and is formed to have a smaller diameter than the large diameter portion 11a. The small diameter portion 11b is integrally formed with the storage cylinder 40 and extends downward from the storage cylinder 40. The annular connecting portion 11c connects the upper end portion of the large diameter portion 11a and the lower end portion of the small diameter portion 11b in the radial direction.

[0032] The inner cylinder 12 of the vertical supply cylinder portion 10 has a large diameter portion 12a, a small diameter portion 12b, and an annular connecting portion 12c. The large diameter portion 12a opens into the mouth portion of the container body A. The large diameter portion 12a is fitted inside the large diameter portion 11a of the outer cylinder 11. The small diameter portion 12b is provided inside the large diameter portion 12a in the radial direction and is formed to have a smaller diameter than the large diameter portion 12a. A ball valve 90 and a storage valve 91 are provided inside the small diameter portion 12b, and the liquid in the container body A is supplied. The annular connecting portion 12c connects the inner peripheral surface of the large diameter portion 12a and the outer peripheral surface of the small diameter portion 12b in the radial direction.

[0033] The lower end of the large-diameter portion 12a protrudes downward beyond the large-diameter portion 11a of the outer cylinder 11. A flange portion 12d protruding radially outward is formed on the portion of the large-diameter portion 12a that protrudes downward beyond the large-diameter portion 11a of the outer cylinder 11. The flange portion 12d is disposed within the mounting cap 30 and rotatably locks the mounting cap 30 about its axis. The flange portion 12d is sandwiched vertically between the inner surface of the mounting cap 30 and the upper end opening edge at the mouth of the container body A. Thereby, the vertical supply cylinder portion 10 is fixed to the mouth of the container body A. The small-diameter portion 12b is disposed coaxially with the axis O1. The small-diameter portion 12b is disposed within the small-diameter portion 11b of the outer cylinder 11. The upper portion of the pipe 10a is fitted within the lower portion of the small-diameter portion 12b. The lower end opening of the pipe 10a is located within the bottom of the container body A. A pipe fitting cylinder 12h protruding downward beyond the annular connecting portion 12c is formed on the small-diameter portion 12b. The pipe 10a is inserted and fitted into the small-diameter portion 12b from below through the pipe fitting cylinder 12h. Of the annular connecting portion 12c, the portion located on the front side of the small-diameter portion 12b is located above the portion located on the rear side of the small-diameter portion 12b. Note that the annular connecting portion 12c may be formed so as to be located at the same height over the entire circumference.

[0034] The vertical supply cylinder portion 10 is provided with a recovery passage 17, a communication path 17a, a communication opening 17b, and a connection passage 18. The recovery passage 17 extends downward from the storage cylinder 40. The recovery passage 17 communicates with the storage space 40a of the storage cylinder 40 when the storage plunger 50 moves rearward. The lower end opening of the recovery passage 17 is closed from below by the annular connecting portion 12c of the inner cylinder 12. The recovery passage 17 is disposed at the rear of the vertical supply cylinder portion 10. The recovery passage 17 is provided between the inner peripheral surface of the outer cylinder 11 and the outer peripheral surface of the inner cylinder 12. The communication path 17a extends circumferentially from the lower end of the recovery passage 17 while extending forward. A pair of left and right communication paths 17a are provided. The communication opening 17b extends downward from the front end of the communication passage 17a and communicates with the inside of the container body A. The communication opening 17b opens into the lower surface of the annular connecting portion 12c of the inner cylinder 12. The connecting passage 18 is disposed in the front part of the vertical supply tube portion 10. The upper end of the connecting passage 18 communicates with the inside of the main cylinder 82, and the lower end of the connecting passage 18 communicates with the communication opening 17b. When the main piston 83 reaches the retracted end position, the connecting passage 18 releases the increased pressure in the main cylinder 82 into the container body A.

[0035] In this embodiment, a plurality of ribs 16 that connect the pipe fitting tube 12h and the large diameter portion 12a of the inner tube 12 together in the radial direction are formed at the rear of the pipe fitting tube 12h at intervals in the circumferential direction. As shown in Figures 2 and 3, the plurality of ribs 16 are formed in a plate shape with the front and back surfaces facing the circumferential direction. The plate thickness of the ribs 16 is smaller than the interval between adjacent ribs 16 in the circumferential direction.

[0036] The rib 16 protrudes downward from the lower surface of the annular connecting portion 12c of the inner tube 12. The lower edge of the rib 16 is radially connected without any step to the lower end opening edge of the pipe fitting tube 12h. Of the lower edge of the rib 16, a connecting portion (rear end portion) 16a with the inner peripheral surface of the large diameter portion 12a of the inner tube 12 protrudes downward and presents a curved shape that is recessed diagonally upward facing rearward when viewed in the circumferential direction. Of the front and back surfaces of the rib 16, the connecting portion (rear end) 16b with the inner peripheral surface of the large diameter portion 12a of the inner tube 12 on the surface opposite to the surface facing other ribs 16 protrudes outward in the left-right direction, and the amount of protrusion outward in the left-right direction increases as it moves rearward, and when viewed from below, presents a curved shape that is concave diagonally rearward facing inward in the left-right direction. When viewed from below, the ribs 16 are provided on both sides of the left-right center of the pipe fitting tube 12h and the large diameter portion 12a of the inner tube 12. When viewed from below, the two ribs 16 are symmetrical with respect to a straight line L that passes through the left-right center of the pipe fitting tube 12h and the large diameter portion 12a of the inner tube 12 and extends in the front-rear direction.

[0037] (Operation of the trigger-type liquid ejector) Next, the case of using the trigger-type liquid ejector 1 configured as described above will be described. It is assumed that the inside of each part of the trigger-type liquid ejector 1 is filled with liquid by operating the trigger part 81 a plurality of times as shown in FIG. 1.

[0038] When the trigger part 81 is pulled and the trigger part 81 is moved backward against the biasing force of the biasing member 84, the main piston 83 moves backward, and the inside of the main cylinder 82 is pressurized. As a result, the liquid in the main cylinder 82 is supplied into the vertical supply cylinder part 10 (the small-diameter part 12b of the inner cylinder 12) through the communication passage 2a. The liquid supplied into the vertical supply cylinder part 10 presses the ball valve 90 downward and pushes up the storage valve 91.

[0039] As a result, the liquid in the vertical supply cylinder part 10 is supplied into the storage space 40a of the storage cylinder 40 through the connection cylinder part 20 and the supply hole 41, and the storage space 40a is pressurized. Along with the pressurization of the storage space 40a, the storage plunger 50 moves backward against the biasing force of the plunger biasing member 60, and the liquid fills the storage space 40a. When the storage plunger 50 moves backward, the liquid in the storage space 40a with increased pressure reaches the ejection hole 4 through the ejection cylinder part 70. As a result, the liquid is ejected forward from the ejection hole 4.

[0040] As described above, every time the operation of pulling the trigger part 81 backward is performed, the liquid can be ejected from the ejection hole 4, and the storage plunger 50 can be moved backward to store the liquid in the storage space 40a. When the sliding cylinder part 50a of the storage plunger 50 exceeds the vertical supply cylinder part 10 backward, the storage space 40a communicates with the upper end part of the recovery passage 17, and the liquid in the storage space 40a is recovered into the container body A through the recovery passage 17, the communication path 17a, and the communication opening 17b.

[0041] After that, when the trigger part 81 is released, the trigger part 81 moves forward in a restoring manner due to the elastic restoring force (biasing force) of the biasing member 84. Accordingly, the main piston 83 connected to the trigger part 81 also moves forward in a restoring manner within the main cylinder 82. Therefore, the pressure inside the main cylinder 82 decreases to a pressure lower than the pressure inside the container body A, and the ball valve 90 rises while the storage valve 91 remains closed. Accordingly, the liquid inside the container body A is sucked into the vertical supply cylinder part 10 and introduced into the main cylinder 82 through the communication passage 2a. Thereby, it can be prepared for the next ejection.

[0042] When the pulling of the trigger part 81 stops, although the supply of the liquid to the storage space 40a through the vertical supply cylinder part 10 and the connection cylinder part 20 stops, the storage plunger 50 starts to move forward due to the biasing force of the plunger biasing member 60. At this time, the outflow of the liquid from the storage space 40a into the vertical supply cylinder part 10 is regulated by the storage valve 91. Thereby, the liquid filled in the storage space 40a reaches the ejection hole 4 through the ejection cylinder part 70 and continues to be ejected forward through the ejection hole 4. In this way, the liquid can be ejected not only when the operation of pulling the trigger part 81 backward is performed, but also when the trigger part 81 is not operated, and continuous ejection of the liquid can be performed.

[0043] As described above, according to the trigger-type liquid ejector 1 of the present embodiment, since the rib 16 that integrally connects the large-diameter part 12a of the inner cylinder 12 and the pipe fitting cylinder 12h in the radial direction is formed at the rear part of the pipe fitting cylinder 12h, the rigidity of the rear parts of the large-diameter part 12a, the annular connection part 12c, and the pipe fitting cylinder 12h can be increased. Thereby, for example, even if an impact force due to dropping or the like is applied to the storage cylinder 40 and a load in a direction in which the upper end part tilts backward is transmitted to the vertical supply cylinder part 10, it is possible to suppress deformation of the rear parts of the large-diameter part 12a, the annular connection part 12c, and the pipe fitting cylinder 12h, and it is possible to suppress the occurrence of cracks or the like starting from this part. Therefore, the impact resistance of the trigger-type liquid ejector 1 can be improved.

[0044] Since the rib 16 is formed in a plate shape with its front and back surfaces facing the circumferential direction, the thickness of the rib 16 can be suppressed, it becomes possible to suppress the occurrence of sink marks during molding, the inner cylinder 12 can be accurately molded, and it is possible to prevent the mounting strength of the inner cylinder 12 to the outer cylinder 11 from decreasing. Since a plurality of plate-shaped ribs 16 are provided at intervals in the circumferential direction, by forming the ribs 16 in a plate shape, it is possible to suppress the difficulty of increasing the rigidity of the rear portions of the large-diameter portion 12a, the annular connecting portion 12c, and the pipe fitting cylinder 12h, respectively.

[0045] Since the plurality of ribs 16 project downward from the lower surface of the annular connecting portion 12c of the inner cylinder 12, it is possible to surely increase the rigidity of the rear portions of the large-diameter portion 12a, the annular connecting portion 12c, and the pipe fitting cylinder 12h of the inner cylinder 12, respectively.

[0046] When the storage plunger 50 moves rearward, since the recovery passage 17 communicates with the storage space 40a, when the liquid is about to be excessively supplied to the storage space 40a, the liquid can be recovered into the container body A by communicating the storage space 40a and the inside of the container body A through the recovery passage 17, the communication path 17a, and the communication opening 17b, and it is possible to suppress the excessive supply of the liquid to the storage space 40a. As described above, since the rigidity of the rear portion of the annular connecting portion 12c of the inner cylinder 12 is increased by the rib 16 and the occurrence of cracks and the like can be suppressed, even when a load in a direction in which the upper end portion of the vertical supply cylinder portion 10 falls backward is applied, the lower end opening of the recovery passage 17 can surely maintain the configuration of communicating with the communication opening 17b through the communication path 17a.

[0047] As described above, the embodiments of the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. The embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. The embodiments and their modifications include, for example, those that can be easily assumed by those skilled in the art, those that are substantially the same, and those within the scope of equivalents.

[0048] For example, three or more ribs 16 may be provided at intervals in the circumferential direction. The vertical supply cylinder portion 10 may not be provided with the recovery passage 17, the communication passage 17a, the communication opening 17b, and the connection passage 18.

[0049] In addition, within the scope not departing from the gist of the present invention, it is possible to appropriately replace the components in the above embodiment with well-known components.

Explanation of Reference Numerals

[0050] 1 Trigger-type liquid ejector 2 Ejector body 3 Nozzle member 4 Ejection hole 10 Vertical supply cylinder portion 11 Outer cylinder 12 Inner cylinder 12a Large-diameter portion of the inner cylinder 12b Small-diameter portion of the inner cylinder 12c Annular connection portion of the inner cylinder 12h Pipe fitting cylinder 16 Rib 17 Recovery passage 17a Communication passage 17b Communication opening 40 Storage cylinder 50 Storage plunger 80 Trigger mechanism 81 Trigger portion A Container body

Claims

1. An ejector body attached to a container body containing a liquid, and a nozzle member attached to the ejector body and having an ejection hole for ejecting the liquid, wherein the ejector body has a vertical supply cylinder for sucking up the liquid in the container body, has a trigger part disposed so as to be movable rearward in a forward biasing state, and a trigger mechanism for causing the liquid to flow from inside the vertical supply cylinder toward the ejection hole side when the trigger part moves rearward, a storage cylinder extending in the front-rear direction, into which the liquid passing through the vertical supply cylinder is supplied when the trigger part moves rearward, and a storage plunger disposed movably in the front-rear direction in the storage cylinder, which moves rearward as the liquid is supplied into the storage cylinder and is biased forward, wherein the storage cylinder is provided above the vertical supply cylinder so as to project rearward from the vertical supply cylinder, the vertical supply cylinder includes an outer cylinder formed integrally with the storage cylinder and an inner cylinder disposed inside the outer cylinder, wherein the inner cylinder has a large-diameter portion opening into the mouth of the container body, a small-diameter portion provided inside the large-diameter portion in the radial direction, into which the liquid in the container body is supplied, and an annular connecting portion connecting the inner peripheral surface of the large-diameter portion and the outer peripheral surface of the small-diameter portion in the radial direction, wherein a pipe fitting cylinder protruding downward from the annular connecting portion is formed in the small-diameter portion, and a plurality of ribs integrally connecting the pipe fitting cylinder and the large-diameter portion in the radial direction are formed at intervals in the circumferential direction at the rear part of the pipe fitting cylinder, the plurality of ribs being formed in a plate shape with the front and back surfaces facing the circumferential direction, a trigger-type liquid ejector.

2. The trigger-type liquid ejector according to claim 1, wherein the plurality of ribs protrude downward from the lower surface of the annular connecting portion.

3. In the vertical supply cylinder, a recovery passage disposed at the rear part of the vertical supply cylinder, extending downward from the storage cylinder and having a lower end opening closed from below by the annular connecting portion, a communication passage extending in the circumferential direction from the lower end portion of the recovery passage, and a communication opening disposed in front of the recovery passage and communicating the communication passage with the inside of the container body are provided, the recovery passage communicating with the inside of the storage cylinder when the storage plunger moves rearward, the trigger-type liquid ejector according to claim 1 or 2.

Images