Trigger-type liquid ejector

Abstract

To provide a trigger type liquid ejection device capable of ensuring durability of an urging member and exhibiting good ejection performance over a long period of time.SOLUTION: In a trigger type liquid ejection device 1 of the aspect according to the present invention, an ejection device body 10 has a vertical supply cylindrical part 20 extending in a vertical direction, a trigger part 45 provided in front of the vertical supply cylindrical part 20 so as to be movable in a longitudinal direction, and an urging member 46 made of a resin material that urges the trigger part 45 forward, and includes a trigger mechanism 24 that circulates a liquid from the vertical supply cylindrical part 20 toward an ejection hole 11a side by moving the trigger part 45 rearward. The urging member 46 includes: a pair of elastic parts 46a extending in a longitudinal direction on both sides in a left and right direction with respect to the vertical supply cylindrical part 20, whose front ends are connected to the trigger part 45 and are elastically displaceable in the longitudinal direction; and a connection part 46b that connects the rear ends of the pair of elastic parts 46a to each other at the rear of the vertical supply cylindrical part 20.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] The trigger type liquid ejector includes a vertical supply tube section extending in the up-down direction, a trigger section provided in front of the vertical supply tube section so as to be movable back and forth, a cylinder communicating with the inside of the vertical supply tube section, a piston that slides back and forth on the inner peripheral surface of the cylinder as the trigger section moves back and forth, and a nozzle member having an ejection hole (see, for example, Patent Document 1 below). An injection tube section extending forward is provided at the upper end of the vertical supply tube section. A nozzle member is disposed in front of the injection tube section with the ejection hole facing forward. According to this configuration, when the trigger portion is pulled backward, the liquid contained in the cylinder flows through the vertical supply tube portion and the injection tube portion toward the ejection hole. This causes the liquid to be ejected through the ejection hole. Meanwhile, when the trigger portion is released and the trigger portion returns to its forward position, the liquid in the container body is sucked up into the vertical supply tube portion. The liquid sucked up into the vertical supply tube portion flows into the cylinder.

[0003] In the configuration of Patent Document 1, the trigger portion is biased forward via a biasing member that is interposed between the injection tube portion and the trigger portion, in front of the vertical supply tube portion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-82042 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in conventional trigger-type liquid ejectors, it is difficult to ensure the length of the biasing member, and the biasing member is likely to become distorted due to the operation of the trigger. In this case, the biasing member is likely to become distorted due to repeated use of the trigger-type liquid ejector, and the biasing member is likely to become worn. When the biasing member becomes worn, it becomes difficult to ensure the biasing force of the biasing member, and the ejection performance may decrease.

[0006] The present invention provides a trigger type liquid ejector that ensures the durability of a biasing member and can exhibit good ejection performance over a long period of time. [Means for solving the problem]

[0007] In order to solve the above problems, the present disclosure employs the following aspects. A trigger-type liquid ejector according to one aspect of the present disclosure comprises a ejector body attached to a container body that contains liquid, and a nozzle member attached to the front end of the ejector body and having an ejection hole formed therein for ejecting liquid forward, wherein the ejector body comprises a vertical supply tube section extending in the up-down direction, a trigger section provided in front of the vertical supply tube section so as to be movable in the front-rear direction, and a biasing member made of a resin material that biases the trigger section forward, and wherein the rearward movement of the trigger section causes liquid to flow from within the vertical supply tube section toward the ejection hole side, and the biasing member extends in the front-rear direction on both the left and right sides of the vertical supply tube section, and comprises a pair of elastic sections whose front ends are connected to the trigger sections and which are provided so as to be elastically displaceable in the front-rear direction, and a connecting section that connects the rear ends of the pair of elastic sections to each other behind the vertical supply tube section.

[0008] According to this aspect, the rear ends of the pair of elastic parts are connected to each other behind the vertical supply tube part, which makes it easier to ensure the length of the elastic parts. Therefore, it is possible to reduce distortion of the elastic parts caused by repeated use of the trigger-type liquid ejector. This makes it possible to suppress the wear of the biasing member and ensure the biasing force of the biasing member for a long period of time. As a result, it is possible to maintain good ejection performance for a long period of time. In addition, because the biasing member can be prevented from becoming worn, a material with low cost and excellent moldability, such as an olefin resin, can be used for the biasing member, which makes it possible to provide a trigger-type liquid ejector with excellent shape accuracy at low cost compared to a case where a hard resin material, such as POM, is used for the biasing member.

[0009] In the trigger-type liquid ejector of the above aspect, it is preferable that the biasing member is formed separately from the vertical supply tube portion, and the connection portion is attached to the vertical supply tube portion. According to this aspect, the degree of freedom in design can be improved compared to when the biasing member is formed integrally with the vertical supply tube portion. In addition, by attaching the biasing member to the vertical supply tube portion, the degree of freedom in designing the cover that functions as the exterior body can also be improved.

[0010] In the trigger-type liquid ejector of the above-mentioned aspect, the trigger mechanism is provided with a cylinder extending forward of the vertical supply tube portion on both left-right sides relative to the vertical supply tube portion, and communicating with the vertical supply tube portion, and a piston slidably provided on the inner surface of the cylinder and moving in the front-rear direction relative to the cylinder as the trigger portion moves in the front-rear direction, and it is preferable that the elastic portion is on both left-right sides of the vertical supply tube portion and extends in the front-rear direction through one side in the up-down direction relative to the cylinder. According to this aspect, the trigger-type liquid ejector can be made smaller in size in the left-right direction than in a configuration in which the elastic portion extends in the front-rear direction on both the left and right sides of the cylinder.

[0011] In the trigger-type liquid ejector of the above aspect, it is preferable that the elastic portion is formed in an arc shape protruding toward one side in the up-down direction when viewed from the left-right direction. According to this aspect, it is easier to ensure the length of the elastic part compared to a configuration in which the elastic part extends linearly between the connection part and the trigger part. Also, since the elastic part is flexibly deformed in response to the operation of the trigger part, it is possible to prevent the biasing force from becoming excessive compared to a case in which the elastic part is elastically displaced by compression or buckling deformation. As a result, it is possible to achieve excellent operability and ensure durability.

[0012] In the trigger-type liquid ejector of the above-mentioned aspect, it is preferable that the trigger portion comprises a trigger body extending in the vertical direction in front of the vertical supply tube portion and having a front wall portion that can be grasped, and a spring receiving portion that protrudes from the trigger body and against which the elastic portion abuts from behind. According to this aspect, it is easier to ensure the rigidity of the trigger body compared to a configuration in which the elastic portion is engaged with a recess formed in the trigger body, etc. As a result, good ejection performance can be maintained for a long period of time. Furthermore, by connecting the trigger body and the elastic portion by abutting the elastic portion against the spring receiving portion, it is possible to prevent the trigger portion from getting caught during its initial movement, thereby allowing the trigger portion to move back and forth smoothly. Effect of the Invention

[0013] According to the aspects of the present invention, the durability of the urging member can be ensured, and good ejection performance can be exhibited over a long period of time. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a vertical cross-sectional view of a trigger type liquid ejector according to a first embodiment. [Diagram 2] FIG. 2 is a partial perspective view of the trigger-type liquid ejector from the rear with the cover removed. [Diagram 3] FIG. 11 is a vertical cross-sectional view of a trigger type liquid ejector according to a second embodiment. [Figure 4] FIG. 11 is a vertical cross-sectional view of a trigger type liquid ejector according to a third embodiment. [Diagram 5] FIG. 2 is a partial perspective view of the trigger-type liquid ejector from the rear with the cover removed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the embodiments and modifications described below, the same reference numerals are used to designate corresponding configurations, and the description thereof may be omitted.

[0016] (First embodiment) 1, the trigger type liquid ejector 1 of this embodiment is capable of ejecting liquid contained in a container body A. The trigger type liquid ejector 1 includes a ejector body 10, a nozzle member 11, and a cover 13. Unless otherwise specified, each component part of the trigger type liquid ejector 1 is a molded product made of synthetic resin such as olefin resin.

[0017] The ejector body 10 includes a vertical supply tube portion 20, an attachment cap 21, a pipe 22, a trigger mechanism 24 having a pump portion 23, an ejection tube portion 25, and a relay member 26.

[0018] Hereinafter, the direction along the axis O1 of the vertical supply tube section 20 (axial direction) is referred to as the up-down direction, and the bottom (not shown) side of the container body A along the up-down direction is referred to as the lower side, and the opposite side is referred to as the upper side. When viewed from the up-down direction, the direction intersecting the axis O1 is referred to as the radial direction. Within the radial direction, the direction in which the vertical supply tube section 20 and the nozzle member 11 are aligned is referred to as the front-rear direction. Within the front-rear direction, the nozzle member 11 side with respect to the vertical supply tube section 20 is referred to as the front side, and the opposite side is referred to as the rear side. Additionally, within the radial direction, the direction perpendicular to the front-rear direction when viewed from the up-down direction is referred to as the left-right direction.

[0019] The vertical supply tube section 20 sucks up the liquid in the container body A through the mouth section A1 of the container body A. The vertical supply tube section 20 is formed in a multi-stage tube shape with the diameter decreasing as it is positioned higher. Specifically, the vertical supply tube section 20 has a small diameter section 20a positioned at the top and a large diameter section 20c connected to the lower side of the small diameter section 20a via a step section 20b. In the illustrated example, the vertical supply tube section 20 has a double tube structure including an outer tube and an inner tube disposed inside the outer tube.

[0020] The large diameter portion 20c is provided with a flange portion 20d that protrudes radially outward. A ball valve 28 is provided in the vertical middle part of the small diameter part 20a. The ball valve 28 approaches and separates from the lower valve seat part 20e protruding into the small diameter part 20a from above. The ball valve 28 switches between communication and blocking between the inside of the container body A and the pump part 23 through the vertical supply tube part 20 in the small diameter part 20a. Specifically, when the ball valve 28 is in a state where it is separated upward from the lower valve seat part 20e, it allows the liquid to flow from the inside of the container body A to the pump part 23 through the vertical supply tube part 20. When the ball valve 28 is seated on the lower valve seat part 20e, it regulates the flow of the liquid from the pump part 23 to the inside of the container body A through the vertical supply tube part 20.

[0021] A changeover valve 29 is provided at the upper end (a portion located above the ball valve 28) in the small diameter portion 20a. The changeover valve 29 is integrally formed from an elastically deformable material such as LDPE (low density polyethylene). The changeover valve 29 is fitted into the small diameter portion 20a so as to be movable upward in a downwardly biased state. The changeover valve 29 moves from above to and away from an upper valve seat portion 20f protruding into the small diameter portion 20a. In the small diameter portion 20a, the changeover valve 29 switches between communication and blocking between the pump portion 23 and the injection tube portion 25 through the vertical supply tube portion 20. Specifically, the changeover valve 29 allows the flow of liquid from the pump portion 23 to the injection tube portion 25 through the vertical supply tube portion 20 when it is separated upward from the upper valve seat portion 20f. When the switching valve 29 is seated on the upper valve seat portion 20f, the switching valve 29 regulates the flow of liquid from the injection tube portion 25 to the pump portion 23 through the vertical supply tube portion 20.

[0022] The attachment cap 21 is formed in a cylindrical shape extending in the vertical direction. The attachment cap 21 is detachably fastened to the mouth portion A1 in a state in which the flange portion 20d is sandwiched between the attachment cap 21 and the upper end opening edge of the mouth portion A1 of the container body A. Note that the method of fixing the attachment cap 21 to the mouth portion A1 may be a method other than a screw (for example, fitting, etc.).

[0023] The pipe 22 is inserted into the vertical supply tube portion 20 through the inside of the large diameter portion 20c, and fitted into the small diameter portion 20a from below. When the trigger-type liquid ejector 1 is attached to the container body A, the pipe 22 extends downward inside the container body A.

[0024] The injection tube portion 25 guides the liquid in the vertical supply tube portion 20 toward the nozzle member 11. The injection tube portion 25 extends forward from a portion of the upper end portion of the vertical supply tube portion 20 that is located above the upper valve seat portion 20f. Relay member 26 connects between injection tube portion 25 and nozzle member 11. Relay member 26 is attached to injection tube portion 25 from the front.

[0025] The trigger mechanism 24 includes a pump portion 23, a trigger portion 45, and a biasing member 46. The pump section 23 stores and pumps the liquid in the container body A in response to the movement of the trigger portion 45. The pump section 23 includes a cylinder 51 and a piston 52. The cylinder 51 is provided in front of the small diameter portion 20a of the vertical supply tube portion 20. The cylinder 51 is formed in a bottomed tube shape that protrudes on both the left and right sides of the vertical supply tube portion 20 (small diameter portion 20a) and opens forward. The cylinder 51 has a double tube structure that includes an outer cylinder tube that is integral with the vertical supply tube portion and an inner cylinder tube that is provided inside the outer cylinder tube.

[0026] The cylinder 51 includes a bottom wall portion 51a, a cylinder tube 51b, and a piston guide 51c. The bottom wall portion 51a is formed in a disk shape centered on the cylinder axis O2 along the front-rear direction. The outer diameter of the bottom wall portion 51a is larger than the outer diameter of the small diameter portion 20a. Therefore, the bottom wall portion 51a protrudes on both sides in the left-right direction relative to the small diameter portion 20a. A communication hole 51d is formed in the outer peripheral portion of the bottom wall portion 51a (a portion located above the cylinder axis O2). The communication hole 51d opens in a portion of the small diameter portion 20a located between the ball valve 28 and the switching valve 29. The communication hole 51d communicates between the inside of the cylinder 51 and the inside of the small diameter portion 20a. In the following description, the direction intersecting the cylinder axis O2 when viewed from the front-rear direction may be referred to as the pump radial direction.

[0027] The cylinder 51b extends forward from the outer circumferential edge of the bottom wall portion 51a. The piston guide 51c protrudes forward from a portion of the bottom wall portion 51a that is located on the cylinder axis O2.

[0028] The piston 52 is provided in the cylinder 51 so as to be movable in the front-rear direction. The piston 52 includes a piston body 52a, a piston flange 52b, and a sliding cylindrical portion 52c. The piston body 52a is formed in a cylindrical shape with a top centered on a piston axis O3 along the front-rear direction. In this embodiment, the cylinder axis O2 and the piston axis O3 are arranged coaxially. A piston guide 51c is inserted into the piston body 52a from the rear. The piston body 52a is configured to be movable in the front-rear direction while being guided by the piston guide 51c.

[0029] The piston flange 52b protrudes outward in the radial direction of the pump from the rear end of the piston body 52a. The sliding cylindrical portion 52c is connected to the outer circumferential edge of the piston flange 52b. The sliding cylindrical portion 52c is formed in a cylindrical shape arranged coaxially with the piston axis O3. The sliding cylindrical portion 52c surrounds the piston body 52a from the outside in the pump radial direction. The sliding cylindrical portion 52c is in close contact with the inner circumferential surface of the cylinder tube 51b at both ends in the front-rear direction. The sliding cylindrical portion 52c slides on the inner circumferential surface of the cylinder tube 51b as the piston 52 moves back and forth relative to the cylinder 51.

[0030] The trigger portion 45 is provided in front of the pump portion 23 so as to be movable back and forth. Specifically, the trigger portion 45 includes a trigger body 45a, a support piece 45b, a connecting portion 45c, and a spring receiving portion 45d. The trigger body 45a has a front wall portion 71 and a peripheral wall portion 72, and is formed in a shallow box shape that is open toward the rear. The trigger body 45a extends in front of the pump portion 23, inclining forward from the top to the bottom. The trigger portion 45 is configured to be movable forward and backward by being gripped via the trigger body 45a (front wall portion 71).

[0031] A pair of left and right support pieces 45b are provided on the upper end of the trigger body 45a. The support pieces 45b extend upward on both left and right sides with respect to the relay member 26. The upper end of each support piece 45b is supported by the relay member 26 so as to be rotatable about an axis along the left and right direction. The connecting portion 45c protrudes in the left-right direction from the upper end of the peripheral wall portion 72. The connecting portion 45c is connected to the front end of the piston body 52a. Therefore, the piston 52 moves rearward relative to the cylinder 51 as the trigger portion 45 moves rearward. The spring receiving portions 45d are provided in a pair on both the left and right sides of the peripheral wall portion 72. The spring receiving portions 45d protrude on both the left and right sides from the trigger body 45a (peripheral wall portion 72). Each spring receiving portion 45d is open upward and rearward.

[0032] 1 and 2, the biasing member 46 biases the trigger portion 45 forward. The biasing member 46 is formed in a U-shape in a plan view. The biasing member 46 includes a pair of elastic portions 46a and a connecting portion 46b. In this embodiment, the biasing member 46 is also integrally formed from an olefin resin (e.g., PP, etc.).

[0033] The connection portion 46b is formed in an arc shape surrounding the upper end portion of the vertical supply tube portion 20 from the rear to both left and right sides in a plan view. The radial dimension of the connection portion 46b increases from both circumferential ends toward the center (rear end portion).

[0034] The connecting portion 46b is engaged with a locking portion 60 provided on the vertical supply tube portion 20. The locking portion 60 includes an upper locking piece 60a and a lower locking piece 60b. The locking pieces 60a, 60b protrude radially outward from the vertical supply tube portion 20 with a gap therebetween in the up-down direction. The locking pieces 60a, 60b are formed in an arc shape surrounding the upper end portion of the vertical supply tube portion 20 from the rear to both sides in the left-right direction in a plan view. The connecting portion 46b is inserted between the locking pieces 60a, 60b, and is attached to the vertical supply tube portion 20 with its movement relative to the vertical supply tube portion 20 restricted.

[0035] The elastic parts 46a extend forward from both ends of the connecting part 46b. That is, the connecting part 46b integrally connects the rear ends of the elastic parts 46a to each other. Each elastic part 46a is disposed on both sides in the left-right direction with respect to the vertical supply tube part 20. Each elastic part 46a has an arc shape protruding upward in a side view. Each elastic part 46a passes above the part of the cylinder 51 that protrudes from the vertical supply tube part 20, and reaches from the upper end of the vertical supply tube part 20 to the front of the cylinder 51. Therefore, a part of each elastic part 46a overlaps with the injection tube part 25 in a side view, and overlaps with the cylinder 51 in a plan view.

[0036] The elastic portion 46a has a rectangular cross section perpendicular to the extension direction. The cross-sectional area of ​​the elastic portion 46a gradually decreases toward the front. The vertical dimension of the rear end of the elastic portion 46a is greater than the vertical dimension of the connecting portion 46b. Therefore, the rear end of the elastic portion 46a protrudes on both sides in the vertical direction relative to the connecting portion 46b. The rear end surface of the elastic portion 46a is close to or in contact with the front end edges of the locking pieces 60a, 60b from the front. However, the cross-sectional shape of the elastic portion 46a can be changed as appropriate. The front end (lower end) of the elastic portion 46a is accommodated in the spring receiving portion 45d in front of the cylinder 51. The elastic portion 46a is connected to the inner surface of the spring receiving portion 45d in the spring receiving portion 45d. In the illustrated example, the elastic portion 46a is connected to the trigger portion 45 by abutting against the rearward-facing surface of the inner surface of the spring receiving portion 45d. In this embodiment, a configuration in which the elastic portion 46a is "connected" to the trigger portion 45 by abutting against the inner surface of the spring receiving portion 45d will be described, but the connection structure between the elastic portion 46a and the trigger portion 45 is not limited to abutment. That is, in this embodiment, the state in which the elastic portion 46a and the trigger portion 45 are "connected" may be in contact so that the biasing force of the elastic portion 46a can be transmitted to the trigger portion 45. In this case, the configuration may be a physical connection other than abutment, such as engagement or fixation by a claw or the like, and also includes a state in which they are chemically connected (joined) by adhesion or the like.

[0037] The elastic portion 46a is configured to be elastically deformable (flexibly deformable) in a direction perpendicular to the extending direction. In this embodiment, the elastic portion 46a flexibly deforms from the rear end, so that the front end is elastically displaced in the front-rear direction. Therefore, the elastic portion 46a is interposed between the upper end of the vertical supply tube portion 20 and the trigger portion 45, and biases the trigger portion 45 forward.

[0038] As shown in Fig. 1, the nozzle member 11 is attached to the relay member 26 from the front. The nozzle member 11 is formed in a cylindrical shape with a bottom that opens to the rear. An ejection hole 11a extending in the front-rear direction is formed in the top wall portion (front wall portion) of the nozzle member 11. The ejection hole 11a communicates with the inside of the injection tube portion 25 through the inside of the nozzle member 11 and the relay member 26.

[0039] The cover 13 surrounds from above, behind and sides a portion of the ejector body 10 that is located above the mounting cap 21. The cover 13 is attached to the ejector body 10 by inserting the ejector body 10 toward the front.

[0040] The cover 13 includes a top wall portion 13a, a rear wall portion 13b, a bottom wall portion 13c, and a side wall portion 13d. The top wall portion 13a extends linearly from the front to the rear above the relay member 26, the injection tube portion 25, and the vertical supply tube portion 20. The rear wall portion 13b extends rearward while curving from the rear end of the top wall portion 13a. The bottom wall portion 13c extends forward from the lower end edge of the rear wall portion 13b. The front end edge of the bottom wall portion 13c is adjacent to the large diameter portion 20c from the rear. The side wall portions 13d are disposed on both left and right sides of the ejector body 10. The outer peripheral edges of the side wall portions 13d are continuous with the left and right end edges of the top wall portion 13a, the rear wall portion 13b and the bottom wall portion 13c, respectively.

[0041] Next, a case where the trigger-type liquid ejector 1 configured as described above is used will be described. It is assumed that by operating the trigger portion 45 multiple times, each portion of the trigger-type liquid ejector 1 is filled with liquid, and the liquid can be sucked up into the vertical supply tube portion 20.

[0042] First, when the trigger portion 45 is pulled backward via the trigger body 45a, the trigger portion 45 rotates around the support piece 45b as a starting point, and the trigger portion 45 moves backward. Then, the elastic portion 46a is pushed backward via the spring receiving portion 45d, and the elastic portion 46a is bent and deformed. As a result, the elastic portion 46a is elastically displaced backward as the trigger portion 45 moves backward. As a result, a biasing force is applied to the trigger portion 45 in the forward direction. Note that, when the trigger portion 45 moves backward, the elastic portion 46a may slide on the inner surface of the spring receiving portion 45d.

[0043] When the trigger portion 45 moves rearward, the piston 52 moves rearward relative to the cylinder 51. Then, the sliding tube portion 52c slides on the inner circumferential surface of the cylinder 51b, pressurizing the inside of the cylinder 51. As a result, the liquid in the cylinder 51 is supplied into the vertical supply tube portion 20 (small diameter portion 20a) through the communication hole 51d. Then, the ball valve 28 is pressed toward the lower valve seat portion 20e by the pressure of the liquid supplied to the small diameter portion 20a, blocking communication between the inside of the container body A and the inside of the vertical supply tube portion 20. As a result, the liquid in the small diameter portion 20a flows upward through the vertical supply tube portion 20.

[0044] As the liquid flows into small diameter portion 20a, the space within small diameter portion 20a that is surrounded by ball valve 28 and switching valve 29 is pressurized. As a result, switching valve 29 is pushed upward, and switching valve 29 moves away from upper valve seat 20f. As a result, small diameter portion 20a and injection tube portion 25 communicate with each other, and the liquid within small diameter portion 20a flows toward injection tube portion 25. The liquid flowing through injection tube portion 25 reaches nozzle member 11 through relay member 26 and is ejected through ejection hole 11a.

[0045] When the operation of the trigger portion 45 is released, the trigger portion 45 moves forward due to the restoring force of the elastic portion 46a. Accordingly, the piston 52 moves forward relative to the cylinder 51. This reduces the pressure inside the piston 52. This causes the ball valve 28 to float from the lower valve seat portion 20e, and the inside of the container body A communicates with the cylinder 51 through the small diameter portion 20a. On the other hand, the switching valve 29 maintains a state of being seated on the upper valve seat portion 20f, blocking communication between the inside of the cylinder 51 and the inside of the injection tube portion 25 through the inside of the small diameter portion 20a. As a result, the liquid in the container body A is sucked up into the vertical supply tube portion 20. The liquid that has flowed into the vertical supply tube portion 20 is introduced into the cylinder 51 through the communication hole 51d, and can be prepared for the next ejection operation.

[0046] In this manner, in the present embodiment, the biasing member 46 is configured to include a pair of elastic portions 46a extending in the front-rear direction on both the left-right sides of the vertical supply tube portion 20, and a connecting portion 46b connecting the rear ends of the pair of elastic portions 46a to each other behind the vertical supply tube portion 20. According to this configuration, by connecting the rear ends of the pair of elastic parts 46a to each other behind the vertical supply tube part 20, it is easy to ensure the length of the elastic parts 46a. Therefore, it is possible to reduce the distortion of the elastic parts 46a caused by the operation of the trigger part 45. This makes it possible to suppress the wear of the urging member 46 caused by repeated use of the trigger type liquid ejector 1, and to ensure the urging force of the urging member 46 for a long period of time. As a result, it is possible to maintain good ejection performance for a long period of time. Furthermore, since the sagging of the biasing member 46 can be suppressed, a material with low cost and excellent moldability, such as an olefin-based resin, can be used for the biasing member 46. Therefore, compared to using a hard resin material such as POM for the biasing member, the freedom of material selection is improved, and a trigger-type liquid ejector 1 with excellent shape accuracy can be provided at low cost. Furthermore, by using an olefin-based resin for the biasing member 46 as in this embodiment, the entire trigger-type liquid ejector 1 can be formed from an olefin-based resin, and the environmental impact can be reduced.

[0047] In this embodiment, the biasing member 46 is formed separately from the vertical supply tube portion 20, and is attached to the vertical supply tube portion 20 via the connection portion 46b. This configuration improves the degree of freedom in design compared to the case where the biasing member 46 is formed integrally with the vertical supply tube portion 20. In addition, by attaching the biasing member 46 to the vertical supply tube portion 20, the degree of freedom in designing the cover 13 that functions as an exterior body can also be improved.

[0048] In this embodiment, the elastic portion 46a extends in the front-rear direction above the portion of the cylinder 51 that protrudes from the vertical supply tube portion 20. With this configuration, compared to a configuration in which the elastic portions 46a extend in the front-rear direction on both the left and right sides of the cylinder 51, the trigger-type liquid ejector 1 can be made smaller in size in the left-right direction.

[0049] In this embodiment, the elastic portion 46a is configured to be formed in an arc shape that protrudes upward when viewed from the left-right direction. According to this configuration, it is easier to ensure the length of the elastic portion 46a compared to a configuration in which the elastic portion 46a extends linearly between the connection portion 46b and the trigger portion 45. Also, since the elastic portion 46a is flexibly deformed in response to the operation of the trigger portion 45, it is possible to prevent the biasing force from becoming excessive compared to a case in which the elastic portion 46a is elastically displaced by compression or buckling deformation. As a result, it is possible to achieve excellent operability and ensure durability.

[0050] In this embodiment, the trigger portion 45 is configured to include a trigger body 45a extending in the vertical direction in front of the vertical supply tube portion 20 and having a front wall portion 71 that can be grasped, and a spring receiving portion 45d that protrudes from the trigger body 45a and is abutted by the elastic portion 46a from behind. This configuration makes it easier to ensure the rigidity of trigger body 45a compared to a configuration in which an elastic portion is engaged in a recess formed in the trigger body, etc. As a result, good ejection performance can be maintained for a long period of time. Furthermore, by connecting the trigger body 45a and the elastic portion 46a by abutting the elastic portion 46a against the spring receiving portion 45d, it is possible to prevent the trigger portion 45 from getting caught during the initial movement. This allows the trigger portion 45 to move smoothly back and forth.

[0051] Second embodiment This embodiment differs from the first embodiment in that a biasing member 46 is attached to the cover 13. 3, a locking hole 13f is formed in the front end portion (the boundary portion with the top wall portion 13a) of the rear wall portion 13b of the cover 13. A downwardly protruding jumping protrusion 13g is formed on the front end opening edge of the locking hole 13f. The lower surface of the jumping protrusion 13g is inclined downward as it extends rearward. A support wall 13h is formed in a portion of the rear wall 13b that is located rearward of the locking hole 13f. The front end of the support wall 13h reaches below the locking hole 13f inside the cover 13. The left and right end edges of the support wall 13h are continuous with the side wall 13d.

[0052] In the urging member 46, the connection portion 46b is inserted from the front between the rear wall portion 13b and the support wall 13h inside the cover 13. A locking protrusion 46c protrudes upward from the connection portion 46b. The locking protrusion 46c is locked in the locking hole 13f in a state in which the connection portion 46b is inserted between the rear wall portion 13b and the support wall 13h. The upper surface of the locking protrusion 46c is arranged flush with the outer surface of the rear wall portion 13b in a state in which the locking protrusion 46c is locked in the locking hole 13f. The locking protrusion 46c climbs over the jumping protrusion 13g backward in the process of the connection portion 46b being inserted between the rear wall portion 13b and the support wall 13h.

[0053] In this embodiment, the front end of each elastic portion 46a is housed inside the trigger body 45a. In the illustrated example, the front end of each elastic portion 46a abuts against a rib 45f protruding from the trigger body 45a from the rear. That is, the elastic portion 46a biases the trigger portion 45 forward via the rib 45f. In this embodiment, the rib 45f protrudes rearward from the front wall portion 71 and is connected to the peripheral wall portion 72 at both ends in the left-right direction. The rear end edge of the rib 45f is located forward of the rear end edge of the peripheral wall portion 72. When the trigger portion 45 moves rearward, the elastic portion 46a elastically deforms rearward while sliding on the rib 45f.

[0054] In this embodiment as well, the pair of elastic parts 46a are connected by the connecting part 46b behind the vertical supply tube part 20, so that the length of the elastic parts 46a can be easily ensured. In particular, in this embodiment, the connecting part 46b is supported by the cover 13, so that the elastic parts 46a can be ensured to be longer than when the connecting part 46b is supported by the vertical supply tube part 20. Therefore, similar to the first embodiment described above, the durability of the urging member 46 can be ensured, and good ejection performance can be exhibited for a long period of time.

[0055] Third embodiment This embodiment differs from the above-described embodiment in that the biasing member 46 is supported at the lower end of the small diameter portion 20a. In the trigger-type liquid ejector 1 shown in Figures 4 and 5, a locking piece 100 is formed at the lower end of the small diameter portion 20a. The locking piece 100 protrudes radially outward from the vertical supply tube portion 20 with a gap in the up-down direction from the step portion 20b. The locking piece 100 is formed in an arc shape that surrounds the upper end of the vertical supply tube portion 20 from the rear to both left and right sides in a plan view.

[0056] The connection portion 101 of the urging member 46 is formed in an X-shape when viewed from the rear. The connection portion 101 connects the rear ends of the elastic portions 46a to each other behind the vertical supply tube portion 20, and is attached to the vertical supply tube portion 20. Specifically, the connection portion 101 includes an upper end connecting portion 101a, a bridge portion 101b, and a lower end connecting portion 101c.

[0057] The upper end connecting portion 101a is formed in an arc shape surrounding the upper end of the vertical supply tube portion 20 from the rear to both left and right sides in a plan view. The rear end of the elastic portion 46a is integrally connected to both ends of the upper end connecting portion 101a. The bridge portion 101b bridges between the upper end connecting portion 101a and the lower end connecting portion 101c. The bridge portion 101b is formed in a circular arc shape protruding toward the rear in a side view. The bridge portion 101b extends downward behind the vertical supply tube portion 20.

[0058] The lower end connecting portion 101c extends forward from the lower end of the bridge portion 101b. The lower end connecting portion 101c is formed in an arc shape surrounding the upper end of the vertical supply tube portion 20 from the rear to both left and right sides in a plan view. The lower end connecting portion 101c is attached to the vertical supply tube portion 20 by being inserted between the step portion 20b and the locking piece 100 from the rear. Locking protrusions 101d protruding upward are formed on both ends of the lower end connecting portion 101c. The locking protrusions 101d are locked to the front end edges of the locking pieces 100 from the front.

[0059] In this manner, also in this embodiment, the pair of elastic portions 46a are connected by the connecting portion 46b at the rear of the vertical supply tube portion 20, so that the length of the elastic portion 46a can be easily ensured. In particular, in this embodiment, the urging member 46 wraps around the upper end portion of the vertical supply tube portion 20 and is attached to the lower end portion of the vertical supply tube portion 20, so that the connecting portion 46b itself can also contribute to the elastic displacement of the urging member 46. This makes it easier to suppress the sagging of the urging member 46.

[0060] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments. Addition, omission, substitution, and other modifications of the configuration are possible without departing from the spirit of the present invention. The present invention is not limited by the above description, but is limited only by the scope of the attached claims. In the above embodiment, the trigger portion 45 is configured to be rotatable, but the pattern is not limited to this checkered pattern. The trigger portion 45 may be configured to be slidable as long as it is configured to be movable in the front-rear direction. In the above-described embodiment, the biasing member 46 is provided separately from the trigger portion 45, the vertical supply tube portion 20, the cover 13, etc., but the present invention is not limited to this configuration. The biasing member may be formed integrally with at least one of the trigger portion 45, the vertical supply tube portion 20, and the cover 13.

[0061] In the above-described embodiment, the elastic portion 46a is formed in an arc shape protruding upward, but the present invention is not limited to this configuration. The elastic portion 46a may be formed in an arc shape protruding downward. In addition, the elastic portion 46a may have various shapes, such as a straight shape or a wavy shape, as long as the elastic portion 46a is elastically displaced in the front-rear direction in response to the front-rear movement of the trigger portion 45. In the above-described embodiment, the elastic portion is connected (contacts) with the spring receiving portion 45d or the rib 45f, but the present invention is not limited to this configuration. The elastic portion may be connected at any position of the trigger portion as long as the elastic portion is connected to the rear of the vertical supply tube portion by the connecting portion.

[0062] In addition, within the scope of the invention, the components in the above-described embodiments may be replaced with well-known components, and the above-described modified examples may be combined as appropriate. [Explanation of symbols]

[0063] 1: Trigger-type liquid ejector 10: Squirt body 11: Nozzle material 11a:Blowout hole 20: Vertical supply tube 24: Trigger mechanism 45: Trigger section 45a: Trigger body 45d: Spring bearing part 45f: Rib (spring bearing part) 46: Pressing member 46a: Elastic part 46b: Connection 51: Cylinder 52: Piston 71: Front wall 101: Connection A: Container body

Claims

1. An ejector body that is attached to a container body that contains a liquid; a nozzle member attached to a front end of the ejector body and having an ejection hole for ejecting liquid forward; The ejector body includes: A vertical supply tube portion extending in the vertical direction; a trigger mechanism including a trigger portion provided in front of the vertical supply tube portion so as to be movable in a front-rear direction, and a biasing member made of a resin material which biases the trigger portion forward, and which causes liquid to flow from inside the vertical supply tube portion toward the nozzle hole side by the backward movement of the trigger portion, The biasing member is a pair of elastic parts extending in the front-rear direction on both the left and right sides of the vertical supply tube part, with front ends connected to the trigger part and elastically displaceable in the front-rear direction; a connecting portion that connects rear ends of the pair of elastic portions to each other behind the vertical supply tube portion; a locking projection that protrudes from the connection portion and is locked to a portion of the cover that covers the ejector body, the portion being located rearward of the vertical supply tube portion through a locking hole formed in the cover; A trigger-type liquid ejector in which the cross-sectional area of ​​the elastic portion perpendicular to the extending direction gradually decreases from the rear end to the front end.

2. The biasing member is formed separately from the vertical supply tube portion, The trigger type liquid ejector according to claim 1 , wherein the connecting portion is attached to the vertical supply tube portion.

3. The trigger mechanism includes: a cylinder provided in front of the vertical supply tube portion and extending to both sides in the left-right direction with respect to the vertical supply tube portion, the cylinder communicating with the inside of the vertical supply tube portion; A piston that is slidably provided on an inner circumferential surface of the cylinder and moves in a front-rear direction relative to the cylinder in accordance with the movement of the trigger portion in the front-rear direction, 3. The trigger type liquid ejector according to claim 1, wherein the elastic portion is disposed on both left and right sides of the vertical supply tube portion and extends in the front-rear direction through one side in the up-down direction of the cylinder.

4. 4. The trigger type liquid ejector according to claim 1, wherein the elastic portion is formed in an arc shape protruding toward one side in the up-down direction when viewed from the left-right direction.

5. The trigger portion is A trigger body extending in the vertical direction in front of the vertical supply tube portion and having a front wall portion that can be gripped; 5. The trigger type liquid ejector according to claim 1, further comprising: a spring receiving portion that protrudes from the trigger body and against which the elastic portion abuts from behind.

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