Trigger liquid sprayer

Abstract

The trigger-type liquid ejector (1) comprises: a longitudinal supply barrel (10); an accumulation cylinder (90) which supplies liquid passing through the longitudinal supply barrel to the interior; and an accumulation plunger (80) which is arranged in the accumulation cylinder in a manner capable of moving in the axial direction along the central axis of the accumulation cylinder, moves toward one axial side as liquid is supplied into the accumulation cylinder, and is urged toward the other axial side by a force-applying member, and is provided in the longitudinal supply barrel with: a recovery passage (17) which is arranged at the rear end of the longitudinal supply barrel, extends downward from the accumulation cylinder, and the lower end of the recovery passage (17) is closed from below; a connecting passage (17a) which extends from the recovery passage along the circumferential direction of the longitudinal supply barrel; and a connecting opening (18a) which is arranged at a position further forward than the recovery passage and connects the connecting passage with the interior of the container body (A).

Description

Technical Field

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

[0002] This application claims priority based on patent application No. 2020-199142 filed in Japan on November 30, 2020, and patent application No. 2020-217409 filed in Japan on December 25, 2020, and the contents of which are incorporated herein. Background Art

[0003] A trigger-type liquid sprayer includes a nozzle member having a spray hole formed therein for spraying liquid forward, and a sprayer body.

[0004] The injector body comprises: an accumulation cylinder, which supplies liquid passing through the longitudinal supply barrel to the interior by the rearward movement of the trigger portion; and an accumulation plunger, which is arranged in the accumulation cylinder in a manner capable of moving in the axial direction along the central axis of the accumulation cylinder, moves toward the rear as the liquid is supplied into the accumulation cylinder, and is urged toward the front by a force-applying member (for example, refer to Patent Document 1).

[0005] A recovery passage extending downward from the storage cylinder is provided at the rear end of the vertical supply tube. The lower end of the recovery passage serves as an opening that opens into the container body.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Laid-Open No. 2017-213497 Summary of the Invention

[0009] Technical issues

[0010] When an existing trigger-type liquid injector falls from the side of the nozzle component in an inverted posture, and an impact force such as a falling impact acts on the trigger-type liquid injector from the front in the up and down directions, a higher load may be generated at the rear end of the longitudinal supply cylinder, and damage may occur in the longitudinal supply cylinder starting from the lower end (opening) of the recovery passage.

[0011] It should be noted that, in conventional trigger-type liquid injectors, while a separate structure is integrally provided at the front end of the longitudinal supply cylinder, reinforcing the front end of the longitudinal supply cylinder with this structure, no such separate structure is provided at the rear end of the longitudinal supply cylinder. Therefore, if, for example, the trigger-type liquid injector is dropped from the side of the reservoir cylinder in an inverted position, and an impact force such as a drop impact acts on the trigger-type liquid injector from behind in the vertical direction, a high load may be applied to the rear end of the longitudinal supply cylinder.

[0012] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a trigger-type liquid sprayer capable of improving impact resistance.

[0013] Technical Solution

[0014] A trigger-type liquid sprayer according to one embodiment of the present invention comprises: an injector body, which is mounted on a container body for storing liquid; and a nozzle member, which is mounted on the front end portion of the injector body and is formed with an injection hole for spraying liquid toward the front, the injector body having: a longitudinal supply cylinder portion, which extends in the up-down direction and absorbs the liquid in the container body; a trigger mechanism, which has a trigger portion arranged in front of the longitudinal supply cylinder portion so as to be movable rearward when a force is applied forward, and the rearward movement of the trigger portion causes the liquid to flow from the inside of the longitudinal supply cylinder portion toward the injection hole side; and an accumulating cylinder body, which causes the liquid to flow through the inside of the longitudinal supply cylinder portion toward the injection hole side due to the rearward movement of the trigger portion. The liquid is supplied to the interior; and an accumulating plunger is arranged in the accumulating cylinder in a manner that is movable in the axial direction along the central axis of the accumulating cylinder, moves toward one side of the axial direction as the liquid is supplied into the accumulating cylinder, and is urged toward the other side of the axial direction by a force-applying component, and is provided in the longitudinal supply cylinder: a recovery passage is arranged at the rear end portion of the longitudinal supply cylinder, extends downward from the accumulating cylinder, and the lower end portion of the recovery passage is closed from below; a connecting passage extends from the recovery passage along the circumferential direction of the longitudinal supply cylinder; and a connecting opening is arranged at a position further forward than the recovery passage, and connects the connecting passage with the container body.

[0015] According to this trigger-type liquid ejector, the liquid in the storage cylinder is recovered into the container through the recovery passage, the communication passage, and the communication opening.

[0016] Here, the lower end of the recovery passage is sealed from below. Therefore, even if an impact force acts on the trigger-type liquid injector in the vertical direction, generating a high load on the rear end of the longitudinal supply cylinder, damage to the longitudinal supply cylinder starting from the lower end of the recovery passage is unlikely to occur. This improves the impact resistance of the trigger-type liquid injector.

[0017] The communication opening may be arranged at a front end portion of the longitudinal supply cylinder.

[0018] In this case, the communication opening is arranged at the front end portion of the longitudinal supply cylinder. Therefore, when the above-mentioned impact force acts, it is possible to effectively suppress the generation of damage starting from the communication opening.

[0019] The trigger mechanism may include: a main piston, which moves back and forth as the trigger part moves; and a main cylinder body, which pressurizes and depressurizes the interior as the main piston moves, and the interior is connected to the longitudinal supply cylinder part. A residual pressure release passage may be provided at the front end portion of the longitudinal supply cylinder part, and the residual pressure release passage extends downward from the main cylinder body and opens in the container body. The connecting passage can connect the recovery passage with the residual pressure release passage, and the connecting opening can be formed by the lower end portion of the residual pressure release passage.

[0020] In this case, the communication opening is formed by the lower end of the residual pressure relief passage. Therefore, it can serve both as the communication opening and the residual pressure relief passage. This simplifies the structure of the trigger-type liquid sprayer and reduces the number of openings that could become a starting point for damage.

[0021] The vertical supply cylinder portion may include an outer cylinder and an inner cylinder fitted into the outer cylinder, and the recovery passage and the communication passage may be provided between the outer cylinder and the inner cylinder.

[0022] In this case, the recovery passage and the communication passage are provided between the outer tube and the inner tube. Therefore, it is sufficient to form grooves corresponding to the recovery passage and / or the communication passage on the outer circumference of the outer tube and / or the inner circumference of the inner tube, thereby simplifying the structure.

[0023] The storage cylinder body can be arranged above the longitudinal supply cylinder body, and is set to intersect with the central axis of the longitudinal supply cylinder body, and protrude further to one side of the axial direction than the longitudinal supply cylinder body. The longitudinal supply cylinder body can include an outer cylinder formed integrally with the storage cylinder body, and an inner cylinder embedded in the inner side of the outer cylinder. The inner cylinder can include: a large diameter portion, which is embedded in the inner side of the mouth of the container body; a small diameter portion, which is arranged radially inside the large diameter portion, and a tube for drawing liquid from the container body is embedded in the inner side; and an annular connecting portion, which radially connects the inner circumferential surface of the large diameter portion with the outer circumferential surface of the small diameter portion. An annular tube embedding cylinder protruding further downward than the annular connecting portion can be formed in the small diameter portion, and a connecting reinforcement portion can be formed on the rear side of the tube embedding cylinder, and the connecting reinforcement portion radially connects the tube embedding cylinder and the large diameter portion as a whole.

[0024] In this case, a connection reinforcement portion is provided on the rear side of the tube fitting tube, which radially connects the large-diameter portion on the inner side of the mouth of the container body and the tube fitting tube into one piece. This increases the strength of the rear side of the annular connection portion and improves its rigidity. Thus, even if an impact caused by, for example, a drop and / or an impact force caused by contact with the outside acts on the storage cylinder, causing the longitudinal supply tube portion to shift, for example, by bending or toppling, the rear side of the annular connection portion can be suppressed from shifting, such as by bending. This can prevent the occurrence of undesirable conditions such as cracks in the connection portion between the rear side of the annular connection portion and the tube fitting tube. In addition, it can be expected that the rigidity of the tube fitting tube will be increased by the connection reinforcement portion, thereby also preventing the occurrence of the above-mentioned undesirable conditions.

[0025] This improves rigidity against unexpected external forces and enhances the trigger-type liquid injector's impact resistance. This results in a high-quality trigger-type liquid injector with strong rigidity against drop impacts, contact shocks, and the like. Furthermore, due to this improved impact resistance, the internal volume (capacity) within the storage cylinder can be further increased, for example by making the storage cylinder longer and positioned axially farther from the longitudinal supply barrel. This allows for further liquid storage within the storage cylinder, making it suitable for continuous injection.

[0026] The connection reinforcement portion may be formed to be connected to the annular connection portion from below.

[0027] In this case, the connection reinforcement portion is also formed integrally with the annular connection portion, thereby further increasing the strength of the rear portion of the annular connection portion and improving the rigidity. Thus, it is possible to effectively suppress the occurrence of defects such as cracks in the connection portion between the rear portion of the annular connection portion and the pipe fitting tube.

[0028] The connection reinforcement portion may be formed to extend in the circumferential direction between the pipe fitting cylinder and the large diameter portion.

[0029] In this case, the circumferentially extending connection reinforcement portion allows the rear portion of the tube fitting tube to be integrally connected to the large-diameter portion over a wider range, further increasing the rigidity of the rear portion of the annular connection portion. Consequently, cracking and other defects can be more effectively suppressed at the connection portion between the rear portion of the annular connection portion and the tube fitting tube.

[0030] Technical Effects

[0031] According to the trigger-type liquid sprayer of the present invention, impact resistance can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1This is a longitudinal sectional view showing a first embodiment of the trigger-type liquid sprayer of the present invention.

[0033] Figure 2 It will Figure 1 An enlarged longitudinal sectional view of the periphery of the accumulator cylinder and accumulator plunger is shown.

[0034] Figure 3 It will Figure 1 An enlarged longitudinal cross-sectional view of the periphery of the longitudinal supply cylinder is shown.

[0035] Figure 4 yes Figure 3 An enlarged view of the main parts.

[0036] Figure 5 It is along Figure 4 A cross-sectional view taken along line VV is shown.

[0037] Figure 6 This is a longitudinal sectional view showing a second embodiment of the trigger-type liquid sprayer of the present invention.

[0038] Figure 7 It will Figure 6 An enlarged longitudinal sectional view of the periphery of the accumulator cylinder and accumulator plunger is shown.

[0039] Figure 8 It will Figure 6 An enlarged longitudinal cross-sectional view of the periphery of the inner cylinder and tube is shown.

[0040] Figure 9 It will Figure 6 An enlarged longitudinal section of the upper rib is shown.

[0041] Figure 10 yes Figure 6 A longitudinal cross-sectional view of the inner cylinder is shown.

[0042] Figure 11 Observed from below Figure 8 A top view of the inner barrel is shown.

[0043] Figure 12 It is along Figure 10 The cross-sectional view is shown along the arrow line AA.

[0044] Explanation of symbols

[0045] 1. 1A trigger liquid sprayer

[0046] 2. 102 injector body

[0047] 3. 103 nozzle parts

[0048] 4. 104 injection holes

[0049] 10, 110 longitudinal supply cylinder

[0050] 12.112 outer cylinder

[0051] 13, 113 inner tube

[0052] 13a, 113a large diameter part

[0053] 13b, 113b small diameter sections

[0054] 13c, 113c annular connecting portion

[0055] 17, 117 recycling channel

[0056] 17a, 117a connecting passage

[0057] 18, 118 residual pressure relief channel

[0058] 18a, 118a communicating openings

[0059] 33, 133 bearing components

[0060] 34, 134 bearing tube

[0061] 50, 150 trigger mechanism

[0062] 51, 151 trigger unit

[0063] 52, 152 main piston

[0064] 53, 153 main cylinder

[0065] 80, 180 accumulation plunger

[0066] 81, 181 force-applying components

[0067] 90, 190 accumulation cylinder

[0068] 95, 195 connecting holes

[0069] 113h pipe fitting tube

[0070] 270 connection reinforcement

[0071] A container body

[0072] O1 axis

[0073] O2 axis DETAILED DESCRIPTION

[0074] (First embodiment)

[0075] Below, refer to Figures 1 to 5The first embodiment of the present invention will be described. In this embodiment, a trigger-type liquid sprayer 1 is mounted on a spray container body A as an example.

[0076] like Figure 1 As shown, a trigger-type liquid sprayer 1 of this embodiment includes an sprayer body 2 attached to a container A containing liquid, and a nozzle member 3 having a spray hole 4 for spraying liquid formed therein and attached to the sprayer body 2 .

[0077] It should be noted that, unless otherwise specified, each component of the trigger liquid sprayer 1 is a molded product made of synthetic resin.

[0078] The injector body 2 includes a vertical supply cylinder 10 , a mounting cap 14 , an ejection cylinder 11 , a trigger mechanism 50 , an accumulation cylinder 90 , a support member 60 , an accumulation plunger 80 , an urging member 81 , an accumulation valve 20 , and a cover C.

[0079] In this embodiment, the central axis of the longitudinal supply cylinder 10 is referred to as the axis O1. The direction along the axis O1 (Z-axis direction) is referred to as the up-down direction. In the up-down direction, the side of the container body A (-Z side) is referred to as the lower side or the bottom, and the opposite side (+Z side) is referred to as the upper side or the top. When viewed from the up-down direction, a direction intersecting the axis O1 (X-axis direction) is referred to as the front-to-back direction, and the direction orthogonal to both the up-down direction and the front-to-back direction (Y-axis direction) is referred to as the left-to-right direction. In the front-to-back direction, the side (+X side) where the injection hole 4 formed in the nozzle component 3 opens is referred to as the front side or the front, and the opposite side (-X side) is referred to as the rear side or the rear.

[0080] In this embodiment, the central axis of the storage cylinder 90 is referred to as the axis O2. In this embodiment, the axis O2 extends in the front-to-back direction. That is, in this embodiment, the front-to-back direction corresponds to the axial direction along the central axis of the storage cylinder 90. In this embodiment, the rear side (-X side) corresponds to one side in the axial direction along the central axis of the storage cylinder 90. In this embodiment, the front side (+X side) corresponds to the other side in the axial direction along the central axis of the storage cylinder 90. However, the axial direction along the axis O2 does not necessarily need to coincide with the front-to-back direction.

[0081] The vertical supply cylinder 10 extends in the vertical direction and draws liquid from the container body A. The vertical supply cylinder 10 includes an outer cylinder 12 with a top and an inner cylinder 13 that fits within the outer cylinder 12. The axis O1 of the vertical supply cylinder 10, which is composed of the outer cylinder 12 and the inner cylinder 13, is located rearward of the container axis of the container body A.

[0082] The outer cylinder 12 has: a large diameter portion 12a; a small diameter portion 12b, which is arranged above the large diameter portion 12a and has a smaller diameter than the large diameter portion 12a; and an annular connecting portion 12c, which connects the upper end of the large diameter portion 12a to the lower end of the small diameter portion 12b. The upper end of the large diameter portion 12a is smaller in diameter than the portion located below the upper end. The outer peripheral surface of the upper end of the large diameter portion 12a is recessed throughout the entire circumference of the large diameter portion 12a. No ribs or the like are provided on the outer peripheral surface of the upper end of the large diameter portion 12a. The small diameter portion 12b is formed into a cylindrical shape with a top, and is arranged coaxially with the axis O1. As Figure 2 As shown, the top wall portion 12 d of the small-diameter portion 12 b is formed integrally with the accumulating cylinder 90 .

[0083] like Figure 1 As shown, the inner tube 13 has: a large diameter portion 13a; a small diameter portion 13b, which is arranged above the large diameter portion 13a and has a smaller diameter than the large diameter portion 13a; and an annular connecting portion 13c, which connects the upper end portion of the large diameter portion 13a and the lower side portion of the small diameter portion 13b.

[0084] The large diameter portion 13a is disposed within the large diameter portion 12a of the outer cylinder 12. The upper end of the large diameter portion 13a fits within the upper end of the large diameter portion 12a of the outer cylinder 12. The upper end of the large diameter portion 13a is in surface contact with the inner circumference of the large diameter portion 12a of the outer cylinder 12 throughout its entire circumference. A seal is formed between the outer circumference of the upper end of the large diameter portion 13a and the inner circumference of the upper end of the large diameter portion 12a of the outer cylinder 12. The lower end of the large diameter portion 13a protrudes downward from the large diameter portion 12a of the outer cylinder 12. An annular flange 13d is formed on the portion of the large diameter portion 13a that protrudes downward from the large diameter portion 12a of the outer cylinder 12, protruding radially outward of the large diameter portion 13a. The flange 13d is disposed within the upper end of the mounting cap 14, which is mounted (e.g., screwed) to the mouth A1 of the container body A, and secures the upper end of the mounting cap 14 so that it can rotate freely about its axis. The flange portion 13d is held between the upper end portion of the mounting cap 14 and the upper opening edge of the mouth portion A1 of the container body A in the vertical direction.

[0085] Small-diameter portion 13b is cylindrical and coaxially arranged with axis O1. Small-diameter portion 13b is open in both the vertical and horizontal directions. Small-diameter portion 13b is disposed within small-diameter portion 12b of outer tube 12. The upper opening edge of small-diameter portion 13b is slightly spaced downward from top wall 12d of outer tube 12. The upper portion of tube 15, extending vertically, is fitted into the interior of the lower portion of small-diameter portion 13b. The lower opening of tube 15 is located at the bottom of container body A (not shown).

[0086] A gap S1 in the up-down direction is provided between the upper surface of the annular connecting portion 13 c and the lower surface of the annular connecting portion 12 c of the outer tube 12 .

[0087] A valve seat portion 13e is formed on the inner circumferential surface of the inner tube 13. In the illustrated example, the valve seat portion 13e is formed by a step in which the inner diameter of the portion above the valve seat portion 13e is larger than the inner diameter of the portion below the valve seat portion 13e. The accumulation valve 20 is seated on the upper surface of the valve seat portion 13e.

[0088] A cylindrical support tube portion 16 is provided on the inner circumferential surface of the inner tube 13, located below the valve seat portion 13e and above the upper end of the tube 15. The outer diameter of the support tube portion 16 is smaller than the inner diameter of the inner tube 13. The support tube portion 16 is coaxial with the axis O1 and protrudes upward from the inner circumferential surface of the inner tube 13. A ball valve 19 is disposed at the upper end opening edge of the support tube portion 16 so as to be able to move away from the support tube portion 16.

[0089] like Figure 3 and Figure 4 As shown, a recovery passage 17 is provided between the outer tube 12 and the inner tube 13. The recovery passage 17 extends downward from the storage cylinder 90. The upper end of the recovery passage 17 is open at the top. The lower end of the recovery passage 17 is closed from below by a closing portion 13h of the inner tube 13. The recovery passage 17 is a vertical groove extending in the vertical direction formed on the inner circumferential surface of the small-diameter portion 12b of the outer tube 12. The closing portion 13h is a portion of the inner tube 13 that faces the vertical groove from below (in the illustrated example, the annular connecting portion 13c).

[0090] The recovery passage 17 is located rearward of the axis O1 and is disposed at the rear end of the vertical supply cylinder 10. The recovery passage 17 communicates with the interior of the container body A via a communication passage 17a and a communication opening 18a, which will be described later.

[0091] The recovery passage 17 may be, for example, a longitudinal groove formed in the outer peripheral surface of the inner tube 13. The recovery passage 17 may also be formed by combining longitudinal grooves formed in the outer tube 12 and the inner tube 13, respectively.

[0092] like Figure 1 and Figure 2 As shown, a connecting cylinder portion 30 extending forward is provided at the upper end portion of the longitudinal supply cylinder portion 10. The connecting cylinder portion 30 is formed into a bottomed cylinder shape that is open at the front and closed at the rear. Figure 2As shown, the bottom 31 of the connecting cylinder 30 is integrally formed with the upper end of the outer cylinder 12. A through-hole 31a is formed in the bottom 31, extending through the bottom 31 in the front-to-back direction. Through-hole 31a opens toward through-hole 13f formed in the upper end of the inner cylinder 13. Through-hole 13f is formed in the small-diameter portion 13b of the inner cylinder 13, located above the valve seat 13e. Thus, the interior of the connecting cylinder 30 communicates with the interior of the inner cylinder 13, located above the valve seat 13e, via through-holes 31a and 13f.

[0093] The inner diameter of the connecting cylindrical portion 30 is equal to or larger than the inner diameter of the inner cylinder 13. A closing plug 32 is tightly fitted into the front end portion of the connecting cylindrical portion 30.

[0094] The closing plug 32 includes a plug body 32a and a flange portion 32b.

[0095] The plug body 32a is formed into a bottomed cylindrical shape that is open to the front and closed at the rear. The plug body 32a is tightly fitted into the front end of the connecting cylinder 30. Thus, the closing plug 32 closes the front end opening of the connecting cylinder 30.

[0096] The flange portion 32b extends outward from the front end opening edge of the plug body 32a. When the plug body 32a is mounted on the connecting cylinder 30, the flange portion 32b abuts against the front end opening edge of the connecting cylinder 30 from the front.

[0097] like Figure 1 As shown, a cylinder tube portion 40 is provided below the connecting tube portion 30 .

[0098] The cylinder tube portion 40 protrudes forward from the small diameter portion 12b of the outer tube 12 and opens forward. The rear portion of the lower end portion of the cylinder tube portion 40 is integrally formed with the annular connecting portion 12c of the outer tube 12.

[0099] Lower ribs 46 are provided around the cylinder barrel portion 40. The lower ribs 46 are arranged between the cylinder barrel portion 40 and the large diameter portion 12a. The lower ribs 46 are provided, for example, at a position avoiding directly below the cylinder barrel portion 40. A pair of lower ribs 46 are provided at intervals in the circumferential direction around the axis of the cylinder barrel portion 40. The upper end of each lower rib 46 is connected to the outer peripheral surface of the cylinder barrel portion 40, and the rear end of each lower rib 46 is connected to the outer peripheral surface of the large diameter portion 12a. It should be noted that the lower ribs 46 may also be provided directly below the cylinder barrel portion 40.

[0100] A fitting cylindrical portion 41 is provided inside the cylinder cylindrical portion 40. This fitting cylindrical portion 41 protrudes forward from the small-diameter portion 12b of the outer cylinder 12 and is open forward. The fitting cylindrical portion 41 is coaxially disposed with the cylinder cylindrical portion 40. The front end of the fitting cylindrical portion 41 is located further rearward than the front end of the cylinder cylindrical portion 40.

[0101] like Figure 3 and Figure 4 As shown, a residual pressure relief passage 18 is formed between the inner circumferential surface of the outer tube 12 and the outer circumferential surface of the inner tube 13. The residual pressure relief passage 18 extends downward from the cylinder body 53 (described later). The residual pressure relief passage 18 extends in the vertical direction. The residual pressure relief passage 18 connects the interior of the fitting cylindrical portion 41 with the interior of the large-diameter portion 13a of the inner tube 13. The residual pressure relief passage 18 connects the interior of the fitting cylindrical portion 41 with the interior of the container body A through the interior of the large-diameter portion 13a.

[0102] The residual pressure relief passage 18 is spaced apart from the recovery passage 17 about the axis O1. The residual pressure relief passage 18 (communication opening 18a described later) is located forward of the recovery passage 17 and the axis O1. The residual pressure relief passage 18 is disposed at the front end of the vertical supply cylinder 10.

[0103] The upper end of the residual pressure relief passage 18 is located behind the fitting cylindrical portion 41. The lower end of the residual pressure relief passage 18 is open downward. The lower end of the residual pressure relief passage 18 is a communication opening 18a formed in the inner cylinder 13 (annular connecting portion 13c). The communication opening 18a opens downward from the inner cylinder 13 and communicates with the interior of the container body A.

[0104] The portion of the residual pressure relief passage 18 located above the lower end (communication opening 18a) is a vertical groove extending in the vertical direction formed on the inner circumferential surface of the small-diameter portion 12b of the outer tube 12. It should be noted that the residual pressure relief passage 18 may also be formed by, for example, a vertical groove formed on the outer circumferential surface of the inner tube 13. Furthermore, the residual pressure relief passage 18 may be formed by combining vertical grooves formed separately in the outer tube 12 and the inner tube 13.

[0105] like Figure 1 and Figure 2 As shown, the ejection tube 11 extends in the front-to-back direction. The interior of the ejection tube 11 is connected to the interior of the longitudinal supply tube 10. The ejection tube 11 extends forward from the storage cylinder 90 and guides the liquid that has passed through the longitudinal supply tube 10 and the connecting tube 30 to the injection hole 4. The central axis of the ejection tube 11 is arranged parallel to the axis O2. In the example shown in the figure, the central axis of the ejection tube 11 is located above the axis O2 of the storage cylinder 90.

[0106] The cover C covers the entire vertical supply cylinder 10 excluding the lower end portion, the entire ejection cylinder 11 , and the entire storage cylinder 90 from at least both sides in the left-right direction and from above.

[0107] The trigger mechanism 50 includes a trigger portion 51 , a cylinder 53 (main cylinder), a piston 52 (main piston), and a coil spring 54 .

[0108] The trigger portion 51 is arranged in front of the longitudinal supply cylinder 10 in such a manner that it can move backward when a force is applied to the front. The trigger portion 51 is arranged below the ejection cylinder 11 and extends in the up-down direction. The trigger portion 51 is supported so as to be able to swing in the front-to-back direction with the rotation axis portion 55 extending in the left-right direction as the center. When viewed from the left-right direction, the rotation axis portion 55 is arranged adjacent to the bottom of the ejection cylinder 11 in the middle part in the front-to-back direction of the ejection cylinder 11. As the trigger portion 51 swings in the front-to-back direction, the piston 52 can move forward and backward. The trigger mechanism 50 causes the liquid to flow from the inside of the longitudinal supply cylinder 10 toward the injection hole 4 side by swinging the trigger portion 51 backward.

[0109] The upper end of the trigger portion 51 abuts against the lower end edge of a later-described restriction wall 72 in the vertical direction due to the forward biasing force of the coil spring 54. As a result, the trigger portion 51 is positioned at the forwardmost swing position.

[0110] The cylinder 53 is arranged behind the trigger portion 51 and faces the trigger portion 51 in the front-rear direction.

[0111] The cylinder body 53 has: an outer cylinder portion 53a, which is open toward the front; a rear wall portion 53b, which closes the rear end opening of the outer cylinder portion 53a; a cylindrical piston guide portion 53c, which protrudes toward the front from the central portion of the rear wall portion 53b; and a cylindrical connecting cylinder portion 53d, which protrudes toward the rear from a portion of the rear wall portion 53b located above the piston guide portion 53c and is open in both the front and rear directions.

[0112] The outer tube portion 53a is coaxially arranged with the cylinder tube portion 40. The outer tube portion 53a is fitted into the cylinder tube portion 40. The inner circumferential surface of the cylinder tube portion 40 and the outer circumferential surface of the outer tube portion 53a are in close contact with each other at both ends in the front-to-back direction. An annular gap S2 is provided between the inner circumferential surface of the cylinder tube portion 40 and the outer circumferential surface of the outer tube portion 53a, in the middle portion between the two ends in the front-to-back direction.

[0113] The outer tube portion 53a is formed with a first vent hole 53g that allows the inner side of the outer tube portion 53a to communicate with the gap S2. Figure 1 As shown, a second vent hole 12f is formed in the annular connecting portion 12c of the outer cylinder 12, which connects the gap S2 with the gap S1 between the annular connecting portion 12c of the outer cylinder 12 and the annular connecting portion 13c of the inner cylinder 13. Furthermore, a third vent hole 13g is formed in the annular connecting portion 13c of the inner cylinder 13, which connects the gap S1 with the inside of the mounting cover 14.

[0114] The connecting cylinder 53d is integrally fitted with the through holes formed in the outer cylinder 12 and the inner cylinder 13. The interior of the inner cylinder 13 of the longitudinal supply cylinder 10 and the interior of the cylinder 53 are connected to each other through the connecting cylinder 53d. The rear end portion of the connecting cylinder 53d protrudes into the interior of the inner cylinder 13. The through hole for the connecting cylinder 53d to be fitted is opened in the portion located between the valve seat portion 13e and the supporting cylinder 16 in the small diameter portion 13b of the inner cylinder 13. Therefore, the ball valve 19, which is seated on the upper end opening edge of the supporting cylinder 16 in a manner capable of moving away from the upper end opening edge of the supporting cylinder 16, switches the connection and disconnection between the container body A and the cylinder 53.

[0115] The ball valve 19 is configured as a check valve that blocks communication between the interior of the container body A within the vertical supply tube 10 and the interior of the cylinder 53 when the cylinder 53 is pressurized. When the cylinder 53 is depressurized, it displaces upward, allowing communication between the interior of the container body A within the vertical supply tube 10 and the interior of the cylinder 53. Because the accumulation valve 20 is disposed above the ball valve 19, excessive upward displacement of the ball valve 19 is limited by the accumulation valve 20. It should be noted that excessive upward displacement of the ball valve 19 can also be limited by the rear end of the communication tube 53d.

[0116] The piston guide portion 53c is formed into a bottomed cylindrical shape that is open at the front and closed at the rear. The piston guide portion 53c is located inside the outer tube portion 53a. The front end of the piston guide portion 53c is located further rearward than the front end of the outer tube portion 53a. The bottom of the piston guide portion 53c is formed into an annular shape, and the fitting tube portion 41 is fitted inside. The front end of the fitting tube portion 41 protrudes into the interior of the piston guide portion 53c. The piston guide portion 53c is coaxially arranged with the fitting tube portion 41. An annular recessed portion 53e is formed on the outer peripheral surface of the rear end of the piston guide portion 53c.

[0117] The piston 52 is arranged inside the cylinder 53 so as to be movable in the front-rear direction. The piston 52 moves in the front-rear direction in conjunction with the swinging of the trigger portion 51. The interior of the cylinder 53 is pressurized and depressurized as the piston 52 moves in the front-rear direction. The piston 52 is coaxially arranged with the cylinder 53 and is formed into a topped cylindrical shape that is open at the rear and closed at the front. The piston 52 is urged forward together with the trigger portion 51 by the force of the coil spring 54. As the trigger portion 51 swings rearward, the piston 52 moves rearward and is pressed into the cylinder 53.

[0118] The piston 52 includes a piston body 52a that opens at the rear and into which a piston guide 53c is inserted, and a sliding tube 52b that projects radially outward from the rear end of the piston body 52a and is in sliding contact with the inner circumferential surface of the outer tube 53a.

[0119] The piston body 52a is formed into a cylindrical shape with a top, which is open at the rear and closed at the front. The inner diameter of the piston body 52a is slightly larger than the outer diameter of the piston guide 53c. The front end of the piston body 52a contacts the trigger 51 from the rear.

[0120] An annular inner lip 52c is formed at the rear end of the piston body 52a. This inner lip 52c protrudes radially inward and slides against the outer circumferential surface of the piston guide 53c. This ensures sealing between the inner lip 52c and the outer circumferential surface of the piston guide 53c.

[0121] Here, when the piston 52 moves rearward and the inner lip 52c reaches the recess 53e of the piston guide 53c, a slight gap is formed between the inner lip 52c and the recess 53e. This gap connects the interior of the outer tube 53a of the cylinder 53 with the gap between the inner circumferential surface of the piston body 52a and the outer circumferential surface of the piston guide 53c. Thus, the interior of the outer tube 53a communicates with the interior of the fitting tube 41 through the interior of the piston guide 53c. The inner lip 52c reaches the recess 53e when the piston 52 is in the rearmost position.

[0122] The sliding cylindrical portion 52b increases in diameter from its center in the front-to-back direction toward the front and rear. The sliding cylindrical portion 52b has outer lip portions 52d located at both ends in the front-to-back direction. The outer lip portions 52d are in close sliding contact with the inner circumferential surface of the outer cylindrical portion 53a. This ensures a tight seal between the outer lip portions 52d and the inner circumferential surface of the outer cylindrical portion 53a.

[0123] When the trigger portion 51 is in the forwardmost swing position, the piston 52 is correspondingly in the forwardmost position. At this point, the sliding cylinder portion 52b closes the first vent hole 53g formed in the outer cylinder portion 53a. Then, when the trigger portion 51 swings rearward, causing the piston 52 to move a predetermined amount rearward from the forwardmost position, the sliding cylinder portion 52b opens the first vent hole 53g. The first vent hole 53g is then exposed to the exterior of the trigger-type liquid sprayer 1 through the interior of the outer cylinder portion 53a. Thus, the interior of the container body A communicates with the exterior of the trigger-type liquid sprayer 1 via the third vent hole 13g formed in the annular connecting portion 13c of the inner cylinder 13, the gap S1, the second vent hole 12f, the gap S2, and the first vent hole 53g.

[0124] The coil spring 54 is formed from, for example, a metal material and is coaxially disposed with the piston 52 and cylinder 53. The coil spring 54 is arranged so as to span the interior of the piston guide 53c and the interior of the piston body 52a. The rear end of the coil spring 54 is supported by the bottom (rear wall 53b) of the piston guide 53c. The rear end of the coil spring 54 surrounds the front end of the engaging cylinder 41. The front end of the coil spring 54 is supported by a rearwardly directed stepped surface formed within the piston body 52a. The coil spring 54 applies a force to the trigger 51 forward via the piston 52.

[0125] A stopper T is detachably provided in the gap between the trigger portion 51 and the cylinder 53 in the front-to-rear direction. The stopper T abuts against the trigger portion 51 and the cylinder 53, thereby restricting the rearward swing of the trigger portion 51. The user can discard the removed stopper T or reattach it after use of the trigger-type liquid sprayer 1 to restrict the rearward swing of the trigger portion 51.

[0126] The storage cylinder 90 is arranged above the longitudinal supply cylinder 10 and the connecting cylinder 30. The trigger 51 is swung rearward to supply the liquid that has passed through the longitudinal supply cylinder 10 and the connecting cylinder 30 into the interior of the storage cylinder 90. The storage cylinder 90 extends in the front-to-back direction, straddling the longitudinal supply cylinder 10 in the front-to-back direction. The storage cylinder 90 is arranged approximately parallel to the connecting cylinder 30 and the cylinder barrel 40. The lower end of the storage cylinder 90 is integrally formed with the upper end of the longitudinal supply cylinder 10 and the upper end of the connecting cylinder 30.

[0127] like Figure 2 As shown, the storage cylinder 90 includes a front wall portion 92 at the front end portion and a cylinder tube 93 extending rearward from the front wall portion 92 . The storage cylinder 90 is formed as a whole in a topped cylindrical shape that is open at the rear and closed at the front.

[0128] The front wall portion 92 protrudes upward from the middle portion of the connecting tube portion 30 in the front-to-back direction. A communication hole 95 is formed in the front wall portion 92, extending through the front wall portion 92 in the front-to-back direction. The communication hole 95 is circular and coaxial with the axis O2. The communication hole 95 opens into a storage space 90a (described later) within the storage cylinder 90 and into the interior of the ejection tube portion 11, which communicates with the injection hole 4.

[0129] It should be noted that the communication hole 95 may be formed in the cylinder 93 .

[0130] The cylinder tube 93 includes a front tube portion 96 extending rearward from the front wall portion 92; a rear tube portion 97 having a larger outer and inner diameter than the front tube portion 96 and located further rearward than the front tube portion 96; and a step portion 98 connecting the front and rear tube portions 96 and 97 in the front-to-back direction. The step portion 98 increases in diameter from the front toward the rear. The top wall portion 12d of the outer tube 12 is connected to the connection between the front tube portion 96 and the step portion 98. The rear tube portion 97 is located further rearward than the longitudinal supply tube portion 10.

[0131] The storage cylinder 90 is formed with a supply hole 91 , a communication groove 94 , and a recovery hole 99 .

[0132] The supply hole 91 is formed in the connecting cylinder 30, in a portion located further rearward of the plug body 32a. The supply hole 91 is formed in the lower portion of the front end of the front cylinder 96. Liquid that has passed through the vertical supply cylinder 10 and the connecting cylinder 30 is supplied to the storage cylinder 90 through the supply hole 91.

[0133] The communication grooves 94 are formed on the inner peripheral surface of the rear portion of the front cylindrical portion 96. The plurality of communication grooves 94 are arranged at intervals around the axis O2.

[0134] Recovery hole 99 integrally extends vertically through the connection between front tube portion 96 and step portion 98, as well as top wall portion 12d of outer tube 12. Recovery hole 99 opens toward the upper end of recovery passage 17 provided in longitudinal supply tube portion 10. Recovery hole 99 communicates with the interior of container body A via recovery passage 17. The rear end of the lower communicating groove 94 of the plurality of communicating grooves 94 is disposed at the front end of recovery hole 99.

[0135] The support member 60 is fixed to the rear end of the accumulating cylinder 90. The support member 60 includes a support wall 62 at the rear end and a fixed cylindrical portion 61 extending forward from the support wall 62. The support member 60 is formed as a whole into a bottomed cylindrical shape, open at the front and closed at the rear. The support member 60 is coaxially arranged with the axis O2. The fixed cylindrical portion 61 fits within the rear end of the accumulating cylinder 90, restricting rearward movement and rotational movement about the axis O2. The support wall 62 is annular in shape. Its exterior communicates with a portion of the accumulating cylinder 90 located further rearward than the accumulating plunger 80 via the inner side of the support wall 62. The fixed cylindrical portion 61 is formed with locking protrusions 63 projecting radially outward. Multiple locking protrusions 63 are spaced apart around the axis O2. The locking protrusions 63 are locked within locking recesses 97a formed in the rear cylindrical portion 97.

[0136] The accumulating plunger 80 is disposed within the accumulating cylinder 90 so as to be movable in the front-rear direction along the axis O2. The accumulating plunger 80 moves rearward as liquid is supplied into the accumulating cylinder 90. The accumulating plunger 80 cuts off the communication between the interior of the vertical supply cylinder 10 and the injection hole 4 through the communication hole 95, and when it moves rearward, it connects the interior of the vertical supply cylinder 10 with the injection hole 4 through the communication hole 95.

[0137] The accumulation plunger 80 includes a sliding member 24 that slides longitudinally within the accumulation cylinder 90, and a receiving member 33 that fits within the sliding member 24. The sliding member 24 and the receiving member 33 are formed into cylindrical shapes extending longitudinally and are disposed coaxially with the axis O2.

[0138] The sliding member 24 is formed of a material softer than the receiving member 33 and the storage cylinder 90 , for example, and includes a plunger tube 25 extending in the front-rear direction and a closing wall 26 closing the front end opening of the plunger tube 25 .

[0139] A front lip portion 25 a and a rear lip portion 25 b are protrudingly provided on the outer peripheral surface of the plunger tube 25 over the entire circumference.

[0140] The front lip 25a slides tightly in the front-to-back direction on the inner circumferential surface of the front barrel portion 96 of the cylinder tube 93. This ensures a tight seal between the front lip 25a and the inner circumferential surface of the front barrel portion 96. The front lip 25a is formed into a cylindrical shape that protrudes forward from the outer circumferential surface of the plunger tube 25. A gap is provided between the inner circumferential surface of the front lip 25a and the outer circumferential surface of the front end portion of the plunger tube 25. The front end portion of the plunger tube 25 located further forward than the front lip 25a is smaller in diameter than the portion located further rearward than the front end portion. A gap is provided between the outer circumferential surface of the front end portion of the plunger tube 25 and the inner circumferential surface of the storage cylinder 90. The supply hole 91 formed inside the front lip 25a and in the storage cylinder 90 is located in this gap.

[0141] This gap becomes a storage space 90 a that stores the liquid that has passed through the vertical supply cylinder 10 , and the storage space 90 a expands as the storage plunger 80 moves rearward as the liquid is supplied.

[0142] The rear lip 25b slides tightly in the front-to-rear direction on the inner circumferential surface of the rear tube portion 97 of the cylinder tube 93. This ensures a tight seal between the rear lip 25b and the inner circumferential surface of the rear tube portion 97. The rear lip 25b is formed into a cylindrical shape that protrudes forward from the rear end outer circumferential edge of the plunger tube 25. A gap is provided between the inner circumferential surface of the rear lip 25b and the outer circumferential surface of the rear end of the plunger tube 25.

[0143] The sealing wall 26 is pressed against the opening periphery of the communicating hole 95 on the rear surface of the front wall 92 of the storage cylinder 90. A protrusion 26a is formed on the front surface of the sealing wall 26, protruding forward. The protrusion 26a is formed in a frustum-shaped shape coaxially with the axis O2. The outer diameter of the protrusion 26a decreases from the rear toward the front. The outer peripheral surface of the protrusion 26a abuts against the inner rear end of the communicating hole 95, thereby sealing the communicating hole 95.

[0144] The receiving member 33 includes a receiving tube 34 and a receiving seat 35 .

[0145] The receiving tube 34 is formed into a topped cylindrical shape, open at the rear and closed at the front, and is disposed inside the plunger tube 25. The rear portion of the receiving tube 34 protrudes rearward from the rear end opening of the plunger tube 25 and enters the rear tube portion 97 of the cylinder tube 93. The outer diameter of the receiving tube 34 is smaller than the inner diameter of the rear tube portion 97. An annular gap is provided between the outer circumferential surface of the rear portion of the receiving tube 34 and the inner circumferential surface of the rear tube portion 97. The front portion of the force-applying member 81 is inserted into this gap.

[0146] The receiving seat 35 is formed in a flange shape protruding from the outer peripheral surface of the receiving tube 34. The receiving seat 35 is provided on the outer peripheral surface of the rear portion of the receiving tube 34. The front surface of the receiving seat 35 abuts or is adjacent to the rear end opening edge of the plunger tube 25.

[0147] The urging member 81 urges the accumulating plunger 80 forward. The front portion of the urging member 81 surrounds the rear portion of the receiving tube 34. The urging member 81 is compressed in the front-to-back direction and positioned between the receiving seat 35 and the support wall 62 of the support member 60. The front edge of the urging member 81 abuts the rear surface of the receiving seat 35. The rear edge of the urging member 81 abuts the front surface of the support wall 62.

[0148] The urging member 81 is a metal coil spring disposed coaxially with the axis O2. In addition, as the urging member 81, a resin spring or other elastic member may be used.

[0149] The accumulating plunger 80 moves rearward against the biasing member 81. As the closing wall 26 moves rearward from the front wall portion 92 of the accumulating cylinder 90, the communicating hole 95 is opened. Therefore, until the accumulating plunger 80 moves rearward, the liquid remains pressurized in the accumulating space 90a of the accumulating cylinder 90, and the hydraulic pressure in the accumulating space 90a reaches a predetermined value. When the accumulating plunger 80 moves rearward against the biasing member 81, the liquid in the accumulating space 90a is supplied to the injection port 4 through the communicating hole 95. In other words, the accumulating plunger 80 functions as a pressure accumulator valve.

[0150] The accumulation valve 20 is a check valve that allows liquid to be supplied from the vertical supply tube 10 into the accumulation cylinder 90 while restricting the outflow of liquid from the accumulation cylinder 90 into the vertical supply tube 10. The accumulation valve 20 is disposed within the inner tube 13 of the vertical supply tube 10. The accumulation valve 20 includes a fixed portion 21 fixed to the upper end of the inner tube 13; a valve body 22 disposed on the upper surface of the valve seat 13e; and an elastically deformable portion 23 connecting the fixed portion 21 and the valve body 22.

[0151] The fixing portion 21 is formed in a disk shape and is tightly fitted into the upper end portion of the inner tube 13 .

[0152] The valve body 22 is formed into a columnar shape extending in the vertical direction. The lower end surface of the valve body 22 is vertically opposed to the ball valve 19. The valve body 22 is also opposed to the rear end opening of the connecting tube 53d in the front-to-back direction. A flange-shaped valve plate 22a is formed on the outer circumference of the valve body 22, located above the connecting tube 53d. This valve plate 22a is positioned upwardly away from the upper surface of the valve seat 13e.

[0153] The elastically deformable portion 23 is formed to be elastically deformable in the vertical direction. When the cylinder 53 is pressurized, the valve body 22 is displaced upward, compressing and deforming the elastically deformable portion 23 upward. This causes the valve plate 22a to move upward away from the valve seat 13e, allowing liquid to be supplied from the vertical supply tube 10 into the storage cylinder 90.

[0154] like Figure 1 As shown, the nozzle member 3 includes a mounting cylinder 71 extending in the front-rear direction, a restriction wall 72 protruding downward from the mounting cylinder 71 , and a nozzle shaft portion 74 located inside the front end portion of the mounting cylinder 71 .

[0155] The rear portion of the mounting tube 71 is tightly fitted onto the ejection tube 11 .

[0156] The restriction wall 72 protrudes downward from the connection portion between the front portion and the rear portion of the mounting tube 71. The upper end portion of the trigger portion 51 abuts against the lower end edge of the restriction wall 72 in the vertical direction.

[0157] The central axis of the nozzle shaft portion 74 is located slightly above the axis O2 of the storage cylinder 90. The nozzle shaft portion 74 is coaxially arranged with the ejection tube portion 11. The front end portion of the nozzle shaft portion 74 is located slightly rearward of the front end portion of the mounting tube 71. A nozzle cover 78 is mounted on the nozzle shaft portion 74. The nozzle cover 78 is formed with an ejection hole 4 that opens forward and ejects liquid forward. The ejection hole 4 is coaxially arranged with the ejection tube portion 11. Although not shown in the figure, a connecting path is provided between the outer surface of the nozzle shaft portion 74 and the inner surface of the nozzle cover 78, which connects the portion of the interior of the mounting tube 71 that is located further rearward than the nozzle shaft portion 74 with the ejection hole 4.

[0158] In the trigger-type liquid injector 1 of this embodiment, the protrusions relative to the axis O1 of the front portion (primarily the ejection cylinder 11 and / or the nozzle member 3, etc.) located forward of the longitudinal supply cylinder 10 and the rear portion (primarily the accumulation plunger 80 and / or the accumulation cylinder 90, etc.) located rearward of the longitudinal supply cylinder 10 are set so that the center of gravity of the trigger-type liquid injector 1 in the front-to-back direction is located near the axis O1. In the illustrated example, the protrusion of the front portion of the trigger-type liquid injector 1 (the length from the axis O1 to the front end of the nozzle member 3) is greater than the protrusion of the rear portion of the trigger-type liquid injector 1 (the length from the axis O1 to the rear end of the accumulation cylinder 90). Furthermore, in the trigger-type liquid injector 1 of this embodiment, the front portion located forward of the longitudinal supply cylinder 10 also protrudes forward relative to the axis of the mounting cap 14. In the illustrated example, the trigger-type liquid sprayer 1 has the same amount of forward and rearward projection relative to the axis of the mounting cap 14. Therefore, in the case of a cylindrical container with the axis of the container body A coaxial with the axis of the mounting cap 14, for example, the center of gravity of the spray container is located near the center in the front-to-back direction. However, in the trigger-type liquid sprayer 1, the amount of projection of the front and rear portions relative to the axis O1, as well as the amount of forward and rearward projection relative to the axis of the mounting cap 14, can be appropriately modified as long as the weight balance of the spray container in the front-to-back direction is achieved.

[0159] Here, if Figure 4 and Figure 5As shown, in this embodiment, a connecting passage 17a is provided in the longitudinal supply cylinder 10. The connecting passage 17a is provided between the outer cylinder 12 and the inner cylinder 13. The connecting passage 17a connects the recovery passage 17 with the residual pressure release passage 18. The connecting passage 17a extends from the recovery passage 17 along the circumferential direction of the longitudinal supply cylinder 10. The connecting passage 17a extends forward from the lower end portion of the recovery passage 17 without shifting in the vertical direction and is connected to the recovery passage 17. The two connecting passages 17a are provided in the radial direction with the axis O1 therebetween. Both connecting passages 17a are arc-shaped.

[0160] The communication passage 17a is a circumferential groove extending in the circumferential direction formed on the inner circumferential surface of the small-diameter portion 12b of the outer tube 12. It should be noted that the communication passage 17a may also be a circumferential groove formed on the inner circumferential surface of the inner tube 13, for example. Furthermore, the communication passage 17a may be formed by combining circumferential grooves formed separately in the outer tube 12 and the inner tube 13.

[0161] The communication passage 17a communicates with the interior of the container body A through the communication opening 18a. The communication passage 17a is not open downward (inside the container body A) in a portion of the inner tube 13 except for the communication opening 18a.

[0162] Next, a description will be given of a case where the trigger-type liquid sprayer 1 configured as described above is used.

[0163] When the trigger 51 is first operated from a non-use state, the piston 52 moves rearward from its forwardmost position by pulling the trigger 51 backward against the biasing force of the coil spring 54. At this time, a portion of the air in the cylinder 53 is discharged into the container body A through the residual pressure release passage 18.

[0164] Thereafter, when the trigger 51 is released, the piston 52 returns forward within the cylinder 53 due to the force of the coil spring 54, and the trigger 51 also returns forward. Consequently, the pressure within the cylinder 53 decreases, reaching a lower pressure than that within the container A. Consequently, with the valve body 22 of the accumulator valve 20 pressed against the upper surface of the valve seat 13e, the ball valve 19 moves upward away from the upper opening edge of the support cylinder 16. Liquid within the container A is drawn into the vertical supply cylinder 10, then introduced into the cylinder 53 via the support cylinder 16 and the connecting cylinder 53d.

[0165] Thus, by providing the residual pressure release passage 18, the air in the cylinder 53 can be efficiently discharged while the liquid sucked from the container body A is stored in the cylinder 53, and preparations before use can be completed quickly with a small number of priming and refilling times.

[0166] Thereafter, by operating the trigger portion 51 as described above, the liquid is filled into each portion of the trigger-type liquid ejector 1 , and the liquid is drawn into the vertical supply cylinder 10 .

[0167] First, when the trigger 51 is pulled rearward against the biasing force of the coil spring 54, the piston 52 moves rearward from its forwardmost position, pressurizing the interior of the cylinder 53. This causes the liquid within the cylinder 53 to be supplied through the connecting tube 53d into the inner tube 13 of the vertical supply tube 10. The liquid supplied to the inner tube 13 then presses downward on the ball valve 19 located at the upper opening edge of the support tube 16, lifting the valve body 22 of the storage valve 20 and separating the valve plate 22a from the upper surface of the valve seat 13e.

[0168] Thus, the liquid in the longitudinal supply cylinder 10 passes through Figure 2 Liquid is supplied to the accumulating space 90a of the accumulating cylinder 90 via the through-holes 13f and 31a, the interior of the connecting tube 30, and the supply hole 91, thereby pressurizing the accumulating space 90a. As the accumulating space 90a is pressurized, the accumulating plunger 80 moves rearward from its most advanced position against the force of the biasing member 81, accumulating liquid in the accumulating space 90a. In the initial stages of liquid introduction into the accumulating space 90a, the liquid enters the gap between the inner circumferential surface of the front lip 25a and the outer circumferential surface of the front end of the plunger barrel 25. This facilitates rearward movement of the accumulating plunger 80.

[0169] By moving the accumulating plunger 80 rearward, the sealing wall 26 moves rearward away from the front wall portion 92 of the accumulating cylinder 90, thereby opening the communicating hole 95. Therefore, the liquid in the accumulating space 90a, whose pressure has been increased, can be guided to the injection hole 4 through the communicating hole 95 and the ejection tube 11, and the liquid can be ejected forward from the injection hole 4.

[0170] In this manner, each time the trigger portion 51 is pulled rearward, the liquid can be ejected from the injection hole 4 , and the accumulation plunger 80 can be moved rearward to accumulate the liquid in the accumulation space 90 a .

[0171] Thereafter, when the trigger 51 is released, the piston 52 returns forward within the cylinder 53 due to the force of the coil spring 54, and the trigger 51 also returns forward. Consequently, the pressure within the cylinder 53 decreases, reaching a lower pressure than that within the container A. Consequently, with the valve body 22 of the accumulator valve 20 pressed against the upper surface of the valve seat 13e, the ball valve 19 moves upward away from the upper opening edge of the support cylinder 16. Liquid within the container A is drawn into the vertical supply cylinder 10, then introduced into the cylinder 53 via the support cylinder 16 and the connecting cylinder 53d.

[0172] When the rearward pulling operation of the trigger portion 51 is stopped, the supply of liquid into the accumulation space 90a through the vertical supply cylinder 10 and the connecting cylinder 30 stops, but the accumulation plunger 80 begins to move forward toward the most advanced position due to the force of the biasing member 81. At this time, the outflow of liquid from the accumulation space 90a into the vertical supply cylinder 10 is restricted by the accumulation valve 20.

[0173] Thus, the liquid accumulated in the storage space 90 a can be guided to the injection hole 4 through the communication hole 95 and the injection tube 11 , and the liquid can be continuously injected forward through the injection hole 4 .

[0174] In this manner, liquid can be ejected not only when the trigger portion 51 is pulled rearward but also when the trigger portion 51 is not pulled, and continuous ejection of liquid is possible.

[0175] If the trigger 51 is pulled rearward with the accumulation plunger 80 at the most retracted position, excessive liquid may be supplied to the accumulation space 90 a , causing leakage or damage to various parts.

[0176] However, in this embodiment, when the accumulating plunger 80 moves rearward to a certain extent, the front lip 25a reaches the communication groove 94, and the accumulating space 90a communicates with the interior of the container body A via the communication groove 94, the recovery hole 99, the recovery passage 17, the communication passage 17a, and the communication opening 18a (residual pressure relief passage 18). Specifically, the recovery passage 17 connects the accumulating space 90a with the interior of the container body A when the accumulating plunger 80 moves rearward. Consequently, a portion of the liquid in the accumulating space 90a returns to the container body A, preventing excessive liquid from being supplied to the accumulating space 90a. This prevents excessive pressure increases in the accumulating space 90a, and prevents leakage and damage to various components.

[0177] As described above, according to the trigger-type liquid injector 1 of this embodiment, the lower end of the recovery passage 17 is sealed from below. Therefore, even if an impact force acts on the trigger-type liquid injector 1 in the vertical direction, generating a high load on the rear end of the vertical supply cylinder 10, damage to the vertical supply cylinder 10 starting from the lower end of the recovery passage 17 is unlikely to occur. This improves the impact resistance of the trigger-type liquid injector 1.

[0178] The connecting opening 18a is arranged at the front end portion of the longitudinal supply cylinder 10. Therefore, when the above-mentioned impact force acts, the damage starting from the connecting opening 18a can be effectively suppressed. It should be noted that in the present embodiment, a connecting cylinder 30 and a cylinder cylinder 40 are provided at the front end portion of the longitudinal supply cylinder 10, so that the front end portion of the longitudinal supply cylinder 10 is reinforced by these connecting cylinder 30 and cylinder cylinder 40. Therefore, even when the above-mentioned impact force acts, the deformation of the front end portion of the longitudinal supply cylinder 10 in the up-down direction is suppressed, and the load generated at the front end portion of the longitudinal supply cylinder 10 is suppressed.

[0179] Furthermore, in this embodiment, the communication opening 18a is located at the front end of the annular connecting portion 13c of the inner tube 13, that is, in front of the small-diameter portion 13b. Here, the small-diameter portion 13b is offset rearward relative to the large-diameter portion 13a. Therefore, when viewed from above, the front end of the annular connecting portion 13c is larger than the rear end. Therefore, when the communication opening 18a is formed at the front end of the annular connecting portion 13c, as in this embodiment, the strength of the annular connecting portion 13c is less likely to decrease than when the communication opening 18a is formed at the rear end. This effectively prevents damage originating from the communication opening 18a, as described above.

[0180] The communication opening 18a is formed by the lower end of the residual pressure release passage 18. Therefore, the communication opening 18a and the residual pressure release passage 18 can be used together. This simplifies the structure of the trigger-type liquid sprayer 1 and reduces the number of openings that may become the starting point of damage.

[0181] The recovery passage 17 and the communication passage 17a are provided between the outer cylinder 12 and the inner cylinder 13. Therefore, it is sufficient to form grooves corresponding to the recovery passage 17 and / or the communication passage 17a on the outer circumferential surface of the outer cylinder 12 and / or the inner circumferential surface of the inner cylinder 13, thereby simplifying the structure.

[0182] (Second embodiment)

[0183] Below, refer to Figures 6-12 A second embodiment of the trigger-type liquid sprayer of the present invention will be described. In this embodiment, a trigger-type liquid sprayer is attached to a spray container as an example.

[0184] like Figure 6 As shown, a trigger-type liquid sprayer 1A of this embodiment includes a sprayer body 102 attached to a container A containing liquid, and a nozzle member 103 having a spray hole 104 for spraying liquid formed therein and attached to the sprayer body 102 .

[0185] It should be noted that, unless otherwise specified, each component of the trigger-type liquid sprayer 1A is a molded product made of synthetic resin.

[0186] (Injector body)

[0187] The injector body 102 mainly includes a vertical supply cylinder 110 , a mounting cap 114 , an ejection cylinder 111 , a trigger mechanism 150 , an accumulation cylinder 190 , a support member 160 , an accumulation plunger 180 , an urging member 181 , a ball valve 119 , an accumulation valve 120 , and a cover 200 .

[0188] In this embodiment, the central axis of the vertical supply cylinder 110 is referred to as axis O1. The container body A side along axis O1 is referred to as the lower side, the opposite side is referred to as the upper side, and the direction along axis O1 is referred to as the up-down direction. Furthermore, when viewed from above, a direction intersecting axis O1 is referred to as the front-back direction, and a direction orthogonal to both the up-down direction and the front-back direction is referred to as the left-right direction.

[0189] In this embodiment, the central axis of the storage cylinder 190 is referred to as the axis O2. In this embodiment, the axis O2 extends in the front-rear direction. Therefore, in this embodiment, the front-rear direction corresponds to the axial direction along the central axis of the storage cylinder 190.

[0190] In this embodiment, the rear corresponds to one side in the axial direction along the central axis of the storage cylinder 190, and the front corresponds to the other side in the axial direction along the central axis of the storage cylinder 190. However, the axial direction along the axis O2 may not coincide with the front-rear direction.

[0191] The vertical supply cylinder 110 extends vertically and draws liquid from the container body A. The vertical supply cylinder 110 comprises a topped cylindrical outer cylinder 112 and an inner cylinder 113 that fits within the outer cylinder 112. The axis O1 of the vertical supply cylinder 110, formed by the outer cylinder 112 and the inner cylinder 113, is positioned rearward of the container axis of the container body A.

[0192] The outer cylinder 112 comprises a large diameter portion 112a, a small diameter portion 112b which is located above the large diameter portion 112a and has a smaller diameter than the large diameter portion 112a, and an annular connecting portion 112c which connects the upper end of the large diameter portion 112a to the lower end of the small diameter portion 112b. The small diameter portion 112b is formed into a topped cylindrical shape and is coaxially arranged with the axis O1. Figure 7 As shown, the top wall portion 112 d of the small-diameter portion 112 b is formed integrally with the accumulating cylinder 190 .

[0193] Thus, the outer tube 112 constituting the vertical supply tube portion 110 is formed integrally with the storage cylinder 190 .

[0194] like Figures 6 to 8 As shown, the inner cylinder 113 has: a large diameter portion 113a; a small diameter portion 113b, which is arranged radially inside the large diameter portion 113a and has a smaller diameter than the large diameter portion 113a; and an annular connecting portion 113c, which radially connects the inner circumference of the large diameter portion 113a and the outer circumference of the small diameter portion 113b.

[0195] The large-diameter portion 113a is disposed within the large-diameter portion 112a of the outer cylinder 112. The lower end of the large-diameter portion 113a protrudes downward from the large-diameter portion 112a of the outer cylinder 112 and fits within the inner side of the mouth A1 of the container body A. An annular flange 113d is formed in the portion of the large-diameter portion 113a that protrudes downward from the large-diameter portion 112a of the outer cylinder 112, protruding radially outward from the large-diameter portion 113a. The flange 113d is disposed within the upper end of the mounting cap 114, which is mounted (e.g., screwed) to the mouth A1 of the container body A, and is secured to the upper end of the mounting cap 114 so that it can rotate freely about its axis. The flange 113d is vertically sandwiched between the upper end of the mounting cap 114 and the upper opening edge of the mouth A1 of the container body A.

[0196] Small-diameter portion 113b is coaxially arranged with axis O1 and has a cylindrical shape that is open in both the vertical and horizontal directions. Small-diameter portion 113b is disposed within small-diameter portion 112b of outer tube 112. The upper opening edge of small-diameter portion 113b is slightly offset downward from top wall 112d of outer tube 112. Fitted within the lower portion of small-diameter portion 113b is the upper portion of tube 115, which extends vertically and draws liquid from container A. The lower opening of tube 115 is located at the bottom of container A (not shown).

[0197] like Figure 8 As shown, the annular connecting portion 113c is formed with a step in the vertical direction so that the portion located further rearward than the small-diameter portion 113b is located lower than the portion located further forward than the small-diameter portion 113b. However, the annular connecting portion 113c may also be formed to maintain the same height throughout the entire circumference.

[0198] A gap S1 is provided in the up-down direction between the upper surface of the annular connecting portion 113 c and the lower surface of the annular connecting portion 112 c of the outer cylinder 112 .

[0199] An annular tube-fitting tube 113h is formed in the small-diameter portion 113b, protruding downward from the annular connecting portion 113c. The tube-fitting tube 113h opens downward and has a tapered shape in longitudinal cross-section, with the inner circumference gradually increasing in diameter as it approaches. The tube 115 is inserted from below through the tube-fitting tube 113h into the inside of the small-diameter portion 113b, thereby fitting therein.

[0200] like Figure 6 and Figure 7 As shown, a valve seat portion 113e is formed on the inner circumferential surface of the inner tube 113. In the illustrated example, the valve seat portion 113e is formed by a step in which the inner diameter of the portion of the inner tube 113 located above the valve seat portion 113e is larger than the inner diameter of the portion located below the valve seat portion 113e. The accumulation valve 120 is seated on the upper surface of the valve seat portion 113e.

[0201] A cylindrical support tube portion 116 is provided on the inner circumferential surface of the inner tube 113, located below the valve seat portion 113e and above the upper end of the tube 115. The outer diameter of the support tube portion 116 is smaller than the inner diameter of the inner tube 113. The support tube portion 116 is coaxially arranged with the axis O1 and protrudes upward from the inner circumferential surface of the inner tube 113. A ball valve 119 is disposed at the upper end opening edge of the support tube portion 116 so as to be able to move away from the support tube portion 116.

[0202] A recovery passage 117 is provided between the outer tube 112 and the inner tube 113 so as to be positioned rearward of the axis O1. The recovery passage 117 extends in the up-down direction and is open at the top and closed at the bottom.

[0203] Specifically, the recovery passage 117 is provided as a longitudinal groove formed on the inner peripheral surface of the small diameter portion 112b of the outer cylinder 112. The recovery passage 117 is provided over the entire length of the small diameter portion 112b in the vertical direction. Figure 8 As shown, the lower end of the recovery passage 117 is closed from below by the annular connecting portion 113c in the inner tube 113. The lower end of the recovery passage 117 is connected to the residual pressure release passage (connection passage) 118 described later through the communication passage 117a, and is connected to the interior of the container body A through the communication opening 118a.

[0204] The recovery passage 117 may be, for example, a longitudinal groove formed in the outer peripheral surface of the inner tube 113. The recovery passage 117 may also be formed by combining longitudinal grooves formed in the outer tube 112 and the inner tube 113, respectively.

[0205] The communication passage 117a connects the recovery passage 117 with the residual pressure relief passage (connecting passage) 118, described later. The communication passage 117a extends from the recovery passage 117 in the circumferential direction of the longitudinal supply cylinder 110. The communication passage 117a extends forward from the lower end of the recovery passage 117 and connects to the residual pressure relief passage 118. The communication passage 117a may be formed, for example, in an arc shape. The two communication passages 117a are arranged radially with the axis O1 interposed therebetween.

[0206] The communication passage 117a is formed on the inner circumferential surface of the small-diameter portion 112b of the outer tube 112 and is configured as a circumferential groove extending in the circumferential direction. It should be noted that the communication passage 117a may also be a circumferential groove formed on the inner circumferential surface of the inner tube 113, for example. Furthermore, the communication passage 117a may be formed by combining circumferential grooves formed separately in the outer tube 112 and the inner tube 113.

[0207] The communication passage 117a communicates with the interior of the container body A through a communication opening 118a described later. The communication passage 117a is closed downward (inside the container body A) except for the communication opening 118a.

[0208] like Figure 6 and Figure 7 As shown, a connecting cylinder portion 130 extending forward is provided at the upper end portion of the longitudinal supply cylinder portion 110 .

[0209] The connecting cylinder 130 is formed into a bottomed cylinder that is open at the front and closed at the rear. The bottom 131 of the connecting cylinder 130 is formed integrally with the upper end of the outer cylinder 112. The bottom 131 has a through hole 131a that passes through the bottom 131 in the front-to-back direction.

[0210] Through-hole 131a opens toward through-hole 113f formed in the upper end of inner tube 113. It should be noted that through-hole 113f is formed in the portion of small-diameter portion 113b of inner tube 113 located above valve seat 113e. Thus, the interior of connecting tube 130 communicates with the portion of inner tube 113 located above valve seat 113e via through-hole 131a and through-hole 113f.

[0211] The inner diameter of the connecting cylinder 130 is equal to or larger than the inner diameter of the inner cylinder 113. In addition, a closing plug 132 is tightly fitted into the front end portion of the connecting cylinder 130.

[0212] The closing plug 132 includes a plug body 132a and a flange portion 132b.

[0213] The plug body 132a is formed into a bottomed cylindrical shape that is open to the front and closed at the rear, and is tightly fitted into the front end of the connecting cylinder 130. Thus, the closing plug 132 closes the front end opening of the connecting cylinder 130.

[0214] The flange portion 132b extends outward from the front end opening edge of the plug body 132a and abuts against the front end opening edge of the connecting cylinder 130 from the front when the plug body 132a is attached to the connecting cylinder 130.

[0215] like Figure 6 As shown, a cylinder tube portion 140 is provided below the connecting tube portion 130 .

[0216] The cylinder tube portion 140 protrudes forward from the small diameter portion 112b of the outer tube 112 and opens forward. The rear portion of the lower end of the cylinder tube portion 140 is integrally formed with the annular connecting portion 112c of the outer tube 112.

[0217] For example, a lower rib 146 is provided around the cylinder tube portion 140 .

[0218] The lower ribs 146 are formed so as to be arranged between the cylinder barrel 140 and the large diameter portion 112a. The lower ribs 146 are, for example, arranged at a position avoiding the position directly below the cylinder barrel 140. A pair of lower ribs 146 are arranged at intervals in the circumferential direction around the axis of the cylinder barrel 140. The upper end of each lower rib 146 is connected to the outer peripheral surface of the cylinder barrel 140, and the rear end of each lower rib 146 is connected to the outer peripheral surface of the large diameter portion 112a. It should be noted that the lower ribs 146 can also be arranged directly below the cylinder barrel 140.

[0219] A fitting cylindrical portion 141 is provided inside the cylinder cylindrical portion 140 . The fitting cylindrical portion 141 protrudes forward from the small-diameter portion 112 b of the outer cylinder 112 and opens forward.

[0220] The fitting cylindrical portion 141 is disposed coaxially with the cylinder cylindrical portion 140. The front end portion of the fitting cylindrical portion 141 is located rearward of the front end portion of the cylinder cylindrical portion 140.

[0221] like Figure 7 and Figure 8 As shown, a residual pressure relief passage (connecting passage) 118 extending vertically is formed between the inner circumferential surface of the outer cylinder 112 and the outer circumferential surface of the inner cylinder 113. Residual pressure relief passage 118 extends downward from the main cylinder 153, described later. Residual pressure relief passage 118 is spaced apart from the recovery passage 117 about the axis O1 and is located forward of both the recovery passage 117 and the axis O1. Specifically, residual pressure relief passage 118 is disposed at the front end of the longitudinal supply cylinder 110.

[0222] The upper end of the residual pressure relief passage 118 is located behind the fitting cylinder 141 . The lower end of the residual pressure relief passage 118 communicates with the interior of the container body A through a communication opening 118a formed in the annular connecting portion 113c of the inner cylinder 113 .

[0223] Thus, the residual pressure relief passage 118 communicates with the interior of the fitting cylindrical portion 141 and the interior of the container body A via the communication opening 118a and the interior of the large-diameter portion 113a. The residual pressure relief passage 118 discharges the air in the main cylinder 153 into the container body A. Furthermore, the recovery passage 117 communicates with the interior of the container body A via the communication passage 117a, the residual pressure relief passage 118, and the communication opening 118a.

[0224] The residual pressure release passage 118 may be formed by, for example, a longitudinal groove formed on the outer peripheral surface of the inner tube 113 , or may be formed by combining longitudinal grooves formed in the outer tube 112 and the inner tube 113 .

[0225] like Figure 6 As shown, the ejection tube 111 extends in the front-to-back direction and communicates with the interior of the longitudinal supply tube 110 through the interior of the storage cylinder 190 and the connecting tube 130. The ejection tube 111 extends forward from the front wall 192 of the storage cylinder 190 and guides the liquid that has passed through the interior of the longitudinal supply tube 110 and the connecting tube 130 to the injection hole 104. The central axis of the ejection tube 111 is arranged parallel to the axis O2. It should be noted that in the example shown in the figure, the central axis of the ejection tube 111 is located above the axis O2 of the storage cylinder 190.

[0226] The trigger mechanism 150 includes a trigger portion 151, a main cylinder 153, a main piston 152, and a coil spring (urging member) 154. The trigger mechanism 150 allows liquid to flow from the vertical supply cylinder 110 toward the injection hole 104 by swinging the trigger portion 151 backward.

[0227] The trigger portion 151 is arranged in front of the vertical supply cylinder portion 110 so as to be movable rearward when urged forward. The trigger portion 151 is formed to extend in the up-down direction and is arranged below the ejection cylinder portion 111.

[0228] The trigger portion 151 is pivotally supported on the nozzle member 103 such that its upper end can swing in the front-rear direction. Specifically, the trigger portion 151 includes a main plate member 151a having a front surface that is curved concavely toward the rear when viewed from the side in the left-right direction; and a pair of side plate members 151b that rise toward the rear from the left and right side edges of the main plate member 151a.

[0229] A pair of connecting plates 151c are formed at the upper ends of the pair of side plate members 151b. These connecting plates 151c extend upward to the sides of the nozzle member 103 and sandwich the nozzle member 103 from the left and right directions. Rotating shafts 155 are protruding outward from the pair of connecting plates 151c in the left and right directions. These rotating shafts 155 are rotatably supported by bearings 156 provided on the sides of the nozzle member 103.

[0230] Thus, the trigger portion 151 is supported so as to be swingable in the front-rear direction about the rotation shaft portion 155 .

[0231] like Figure 6 and Figure 7 As shown, the master cylinder 153 is disposed behind the trigger portion 151 and is disposed opposite the trigger portion 151 in the front-to-back direction. The master cylinder 153 includes an outer cylinder portion 153a that is open toward the front; a rear wall portion 153b that closes the rear end opening of the outer cylinder portion 153a; a cylindrical piston guide portion 153c that protrudes forward from the center portion of the rear wall portion 153b; and a cylindrical connecting cylinder portion 153d that protrudes rearward from a portion of the rear wall portion 153b located above the piston guide portion 153c and is open in both the front-to-back directions.

[0232] The outer tube portion 153a is coaxially arranged with the cylinder tube portion 140 and is fitted into the cylinder tube portion 140. The inner circumferential surface of the cylinder tube portion 140 and the outer circumferential surface of the outer tube portion 153a are in close contact with each other at both ends in the front-to-back direction. An annular gap S2 is provided between the inner circumferential surface of the cylinder tube portion 140 and the outer circumferential surface of the outer tube portion 153a, in the middle portion between the two ends in the front-to-back direction.

[0233] The outer tube portion 153a is formed with a first vent hole 153g that allows the inner side of the outer tube portion 153a to communicate with the gap S2. Figure 6 As shown, a second vent hole 112f is formed in the annular connecting portion 112c of the outer cylinder 112, which connects the gap S2 with the gap S1 between the annular connecting portion 112c of the outer cylinder 112 and the annular connecting portion 113c of the inner cylinder 113. Furthermore, a third vent hole 113g is formed in the annular connecting portion 113c of the inner cylinder 113, which connects the gap S1 with the inner side of the mounting cover 114.

[0234] The connecting tube 153d is integrally fitted into the through-holes formed in the outer tube 112 and the inner tube 113. The interior of the inner tube 113 of the longitudinal supply tube 110 and the interior of the main cylinder 153 are connected through the connecting tube 153d. The rear end of the connecting tube 153d protrudes into the interior of the inner tube 113.

[0235] The through hole into which the connecting cylinder 153d is fitted opens in the portion of the small-diameter portion 113b of the inner cylinder 113 between the valve seat portion 113e and the supporting cylinder 116. Therefore, the ball valve 119, which is seated on the upper end opening edge of the supporting cylinder 116 so as to be able to move away from the upper end opening edge of the supporting cylinder 116, can switch between connecting the container body A and the main cylinder 153 and shutting off the connection.

[0236] The ball valve 119 is configured to cut off the communication between the container body A in the longitudinal supply cylinder 110 and the main cylinder 153 when the main cylinder 153 is pressurized, and to move upward when the main cylinder 153 is depressurized, thereby allowing the communication between the container body A in the longitudinal supply cylinder 110 and the main cylinder 153 to pass through the check valve.

[0237] Since the accumulation valve 120 is arranged above the ball valve 119, the excessive upward displacement of the ball valve 119 is restricted by the accumulation valve 120. In addition, the ball valve 119 may also be restricted from excessive upward displacement by communicating with the rear end of the cylindrical portion 153d.

[0238] The piston guide 153c is formed into a bottomed cylindrical shape, open at the front and closed at the rear. It is located inside the outer tube 153a. The front end of the piston guide 153c is located further rearward than the front end of the outer tube 153a. The bottom of the piston guide 153c is formed into an annular shape, and the fitting tube 141 is fitted inside. The front end of the fitting tube 141 protrudes into the interior of the piston guide 153c.

[0239] The piston guide portion 153c is disposed coaxially with the fitting cylindrical portion 141. An annular recessed portion 153e is formed on the outer peripheral surface of the rear end portion of the piston guide portion 153c.

[0240] The master piston 152 is disposed inside the master cylinder 153 so as to be movable in the front-rear direction and is movable in the front-rear direction in conjunction with the swinging of the trigger portion 151. The interior of the master cylinder 153 is pressurized and depressurized as the master piston 152 moves in the front-rear direction.

[0241] The master piston 152 is formed in a topped cylindrical shape with an opening at the rear and a closed front, and is coaxially disposed with the master cylinder 153. The master piston 152 is locked to a vertically intermediate portion of the trigger portion 151.

[0242] The primary piston 152 is urged forward together with the trigger portion 151 by the biasing force of the coil spring 154. The primary piston 152 moves rearward as the trigger portion 151 swings rearward, and is pressed into the master cylinder 153.

[0243] The primary piston 152 includes a piston body 152a that opens at the rear and into which a piston guide 153c is inserted, and a sliding cylinder 152b that projects radially outward from the rear end of the piston body 152a and is in sliding contact with the inner circumferential surface of the outer cylinder 153a.

[0244] The piston body 152a is formed into a cylindrical shape with a top, open at the rear and closed at the front. The inner diameter of the piston body 152a is slightly larger than the outer diameter of the piston guide 153c. The front end of the piston body 152a is locked to the trigger 151 by contacting the trigger 151 from the rear.

[0245] An annular inner lip 152c is formed at the rear end of the piston body 152a. This inner lip 152c protrudes radially inward and slides against the outer circumference of the piston guide 153c. This ensures sealing between the inner lip 152c and the outer circumference of the piston guide 153c.

[0246] It should be noted that as the primary piston 152 moves rearward, when the inner lip 152c reaches the recessed portion 153e of the piston guide 153c, a slight gap is formed between the inner lip 152c and the recessed portion 153e. This gap allows the interior of the outer tube 153a of the primary cylinder 153 to communicate with the gap between the inner circumferential surface of the piston body 152a and the outer circumferential surface of the piston guide 153c. Consequently, the interior of the outer tube 153a communicates with the interior of the fitting tube 141 through the interior of the piston guide 153c.

[0247] It should be noted that the inner lip portion 152 c reaches the recessed portion 153 e when the primary piston 152 is located at the rearmost position.

[0248] The sliding cylindrical portion 152b increases in diameter from its center in the front-to-back direction toward the front and rear. The sliding cylindrical portion 152b has outer lip portions 152d located at both ends in the front-to-back direction. The outer lip portions 152d are in close sliding contact with the inner circumference of the outer cylindrical portion 153a. This ensures a tight seal between the outer lip portions 152d and the inner circumference of the outer cylindrical portion 153a.

[0249] When the trigger portion 151 is in the forwardmost swing position, the primary piston 152 is correspondingly positioned in the forwardmost position. At this time, the sliding cylindrical portion 152b closes the first vent hole 153g formed in the outer cylindrical portion 153a. Then, when the trigger portion 151 swings rearward, causing the primary piston 152 to move rearward a predetermined amount from the forwardmost position, the sliding cylindrical portion 152b opens the first vent hole 153g. This opens the first vent hole 153g to the outside of the trigger-type liquid sprayer 1A through the interior of the outer cylindrical portion 153a.

[0250] Thus, the interior of the container body A can communicate with the outside of the trigger liquid sprayer 1A through the third vent hole 113g formed in the annular connecting portion 113c of the inner tube 113, the gap S1, the second vent hole 112f, the gap S2, and the first vent hole 153g.

[0251] The coil spring (urging member) 154 is made of metal, is disposed coaxially with the primary piston 152 and the master cylinder 153 , and urges the trigger portion 151 forward via the primary piston 152 .

[0252] Coil spring 154 is arranged so as to span the interior of piston guide 153c and piston body 152a. The rear end of coil spring 154 is supported by the bottom (rear wall 153b) of piston guide 153c, surrounding the front end of fitting cylinder 141. The front end of coil spring 154 is supported by a rearward-facing step formed in piston body 152a.

[0253] It should be noted that the material of the coil spring 154 is not limited to metal, and a resin spring or the like may be used, for example.

[0254] A stopper T is detachably provided in a gap in the front-rear direction between the trigger portion 151 and the master cylinder 153 .

[0255] The stopper T is a restricting member that restricts the rearward swing of the trigger portion 151 by contacting the trigger portion 151 and the main cylinder 153. The user can discard the removed stopper T or reattach the stopper T after use of the trigger-type liquid sprayer 1A to restrict the rearward swing of the trigger portion 151.

[0256] like Figure 6 and Figure 7 As shown, the accumulating cylinder 190 is positioned above the longitudinal supply cylinder 110 and the connecting cylinder 130. Rearward swinging of the trigger 151 supplies the liquid that has passed through the longitudinal supply cylinder 110 and the connecting cylinder 130 into the interior of the accumulating cylinder 190. The accumulating cylinder 190 extends in the front-to-back direction, straddling the longitudinal supply cylinder 110. In the illustrated example, the accumulating cylinder 190 is positioned approximately parallel to the connecting cylinder 130 and the cylinder barrel 140. The lower end of the accumulating cylinder 190 is integrally formed with the upper ends of the longitudinal supply cylinder 110 and the connecting cylinder 130.

[0257] The storage cylinder 190 includes a front wall portion 192 at the front end portion and a cylinder tube 193 extending rearward from the front wall portion 192 . The storage cylinder 190 is formed as a whole in a topped cylindrical shape that is open at the rear and closed at the front.

[0258] The front wall portion 192 protrudes upward from the middle portion of the connecting tube portion 130 in the front-to-back direction. A communication hole 195 is formed in the front wall portion 192, extending through the front wall portion 192 in the front-to-back direction. The communication hole 195 is circular and coaxial with the axis O2. This allows the storage space 190a (described later) within the storage cylinder 190 to communicate with the interior of the ejection tube portion 111, which communicates with the injection hole 104, through the communication hole 195. It should be noted that the communication hole 195 may also be formed in the cylinder tube 193.

[0259] The cylinder 193 includes: a front cylinder portion 196, which extends rearward from the front wall portion 192; a rear cylinder portion 197, whose outer diameter and inner diameter are larger than those of the front cylinder portion 196 and is located further rearward than the front cylinder portion 196; and a step portion 198, which connects the front cylinder portion 196 and the rear cylinder portion 197 in the front-to-back direction.

[0260] The step portion 198 increases in diameter from the front toward the rear. The top wall portion 112 d of the outer tube 112 is connected to the portion of the connection between the front tube portion 196 and the step portion 198 located at the lower side of the cylinder tube 193 .

[0261] The rear cylinder portion 197 is located further rearward than the vertical supply cylinder portion 110. Therefore, the rear cylinder portion 197 functions as a rear cylinder portion of the storage cylinder 190 that protrudes further rearward than the vertical supply cylinder portion 110. It should be noted that the rear cylinder portion 197 is formed integrally with the upper end portion of the vertical supply cylinder portion 110.

[0262] Furthermore, the storage cylinder 190 is formed with a supply hole 191 , a communication groove 194 , and a recovery hole 199 .

[0263] The supply hole 191 is formed at the lower portion of the front end of the front cylinder 196 and is located further rearward of the plug body 132a within the connecting cylinder 130. Thus, liquid passing through the longitudinal supply cylinder 110 and the connecting cylinder 130 is supplied to the storage cylinder 190 through the supply hole 191.

[0264] The communication groove 194 is formed on the inner peripheral surface of the rear portion of the front cylindrical portion 196. The plurality of communication grooves 194 are arranged at intervals around the axis O2.

[0265] Recovery hole 199 integrally extends vertically through the connection between front tube portion 196 and step portion 198, as well as top wall portion 112d of outer tube 112. Recovery hole 199 opens toward the upper end of recovery passage 117 provided in longitudinal supply tube portion 110. Thus, recovery hole 199 communicates with the interior of container body A via recovery passage 117. It should be noted that the rear end of the lower communicating groove 194, among the plurality of communicating grooves 194, is located at the front end of recovery hole 199.

[0266] The support member 160 is fixed to the rear end of the storage cylinder 190 and is arranged coaxially with the axis O2. The support member 160 includes a support wall portion 162 located at the rear end and a fixed cylindrical portion 161 extending forward from the support wall portion 162. The support member 160 is formed as a whole into a bottomed cylindrical shape that is open at the front and closed at the rear.

[0267] The fixed cylindrical portion 161 is fitted into the rear end of the accumulating cylinder 190, while its rearward movement and rotational movement about the axis O2 are restricted. The support wall 162 is formed into an annular shape. The interior of the support wall 162 allows communication between the exterior and a portion of the accumulating cylinder 190 located further rearward than the accumulating plunger 180.

[0268] A locking projection 163 protruding forward is formed on the support wall portion 162. Multiple locking projections 163 are spaced apart around the axis O2 and are locked from the front into a locking recess 197a formed in the rear cylindrical portion 197. This prevents the fixed cylindrical portion 161 from falling rearward from the storage cylinder 190.

[0269] The accumulating plunger 180 is disposed within the accumulating cylinder 190 so as to be movable in the front-to-rear direction along the axis O2. The accumulating plunger 180 moves rearward as liquid is supplied into the accumulating cylinder 190. The accumulating plunger 180 cuts off the communication between the interior of the vertical supply cylinder 110 and the injection hole 104 through the communication hole 195. When moving rearward, the accumulating plunger 180 connects the interior of the vertical supply cylinder 110 with the injection hole 104 through the communication hole 195.

[0270] Accumulating plunger 180 includes sliding member 124 that slides longitudinally within accumulating cylinder 190, and receiving member 133 that fits within sliding member 124. Sliding member 124 and receiving member 133 are formed into cylindrical shapes extending longitudinally and are disposed coaxially with axis O2.

[0271] The sliding member 124 is formed of a material softer than the receiving member 133 and the storage cylinder 190 , for example, and includes a plunger tube 125 extending in the front-rear direction and a closing wall 126 closing the front end opening of the plunger tube 125 .

[0272] A front lip portion 125 a and a rear lip portion 125 b are protrudingly provided on the outer peripheral surface of the plunger tube 125 over the entire circumference.

[0273] The front lip 125a slides closely in the front-to-back direction on the inner peripheral surface of the front tube portion 196 of the cylinder 193. Thus, sealing performance is ensured between the front lip 125a and the inner peripheral surface of the front tube portion 196.

[0274] Specifically, the front lip 125a is formed into a cylindrical shape that protrudes forward from the outer circumferential surface of the plunger barrel 125. A gap is provided between the inner circumferential surface of the front lip 125a and the outer circumferential surface of the front end portion of the plunger barrel 125. Furthermore, the front end portion of the plunger barrel 125 located forward of the front lip 125a is reduced in diameter relative to the portion located rearward of the front end portion. A gap is provided between the outer circumferential surface of the front end portion of the plunger barrel 125 and the inner circumferential surface of the storage cylinder 190.

[0275] Furthermore, the supply hole 191 formed inside the front lip 125a and the storage cylinder 190 is opened in this gap. Therefore, this gap functions as a storage space 190a that stores the liquid that has passed through the longitudinal supply cylinder 110, and the storage space 190a expands by causing the storage plunger 180 to move rearward due to the supply of liquid.

[0276] The rear lip 125b slides tightly in the front-to-rear direction on the inner circumferential surface of the rear tube portion 197 in the cylinder tube 193. This ensures a tight seal between the rear lip 125b and the inner circumferential surface of the rear tube portion 197. The rear lip 125b is formed into a cylindrical shape that protrudes forward from the outer circumferential edge of the rear end of the plunger tube 125. A gap is provided between the inner circumferential surface of the rear lip 125b and the outer circumferential surface of the rear end of the plunger tube 125.

[0277] The closing wall 126 is pressed against a portion of the rear surface of the front wall portion 192 of the storage cylinder 190 that is located around the opening of the communication hole 195. A protrusion 126a that protrudes forward is formed on the front surface of the closing wall 126.

[0278] The protrusion 126a is formed in a frustum shape coaxially with the axis O2. The outer diameter of the protrusion 126a decreases from the rear to the front. Thus, the outer peripheral surface of the protrusion 126a abuts against the rear end of the communicating hole 195, thereby closing the communicating hole 195.

[0279] The receiving member 133 includes a receiving tube 134 and a receiving seat 135 .

[0280] The receiving tube 134 is formed in a topped cylindrical shape, open at the rear and closed at the front. It is located inside the plunger tube 125. The rear portion of the receiving tube 134 protrudes further rearward than the rear end opening of the plunger tube 125 and enters the rear tube portion 197 of the cylinder tube 193. The outer diameter of the receiving tube 134 is smaller than the inner diameter of the rear tube portion 197. As a result, an annular gap is formed between the outer circumferential surface of the rear portion of the receiving tube 134 and the inner circumferential surface of the rear tube portion 197. The front portion of the force-applying member 81 is inserted into this gap.

[0281] The receiving seat portion 135 is formed in a flange shape protruding from the outer peripheral surface of the rear portion of the receiving tube 134. The front surface of the receiving seat portion 135 abuts against or is close to the rear end opening edge of the plunger tube 125.

[0282] The urging member 181 urges the accumulating plunger 180 forward. The urging member 181 surrounds the rear portion of the receiving tube 134 and is compressed in the front-to-back direction between the receiving seat 135 and the support wall 162 of the support member 160. As a result, the front edge of the urging member 181 abuts the rear surface of the receiving seat 135, and the rear edge abuts the front surface of the support wall 162.

[0283] The urging member 181 is a metal coil spring disposed coaxially with the axis O2. However, the present invention is not limited to this, and for example, a resin spring or other elastic member may be used as the urging member 181.

[0284] As the accumulating plunger 180 moves rearward against the biasing member 181, the communication hole 195 opens as the closing wall 126 moves rearward from the front wall portion 192 of the accumulating cylinder 190. Consequently, the liquid remains pressurized in the accumulating space 190a of the accumulating cylinder 190 until the accumulating plunger 180 moves rearward. Then, when the hydraulic pressure in the accumulating space 190a reaches a predetermined value, the accumulating plunger 180 moves rearward against the biasing member 181. This allows the liquid in the accumulating space 190a to be supplied to the injection port 104 through the communication hole 195. Thus, the accumulating plunger 180 functions as a pressure accumulator valve.

[0285] The accumulation valve 120 is provided in the inner tube 113 of the vertical supply tube portion 110 .

[0286] Accumulation valve 120 is a check valve that allows liquid to be supplied from vertical supply tube 110 into accumulation cylinder 190 while restricting liquid from flowing out of accumulation cylinder 190 into vertical supply tube 110. Specifically, accumulation valve 120 includes a fixing portion 121 fixed to the upper end of inner tube 113; a valve body 122 disposed on the upper surface of valve seat 113e; and an elastically deformable portion 123 connecting fixing portion 121 and valve body 122.

[0287] The fixing portion 121 is formed in a disk shape and is tightly fitted into the upper end portion of the inner cylinder 113 .

[0288] The valve body 122 is formed in a vertically extending columnar shape and faces the rear end opening of the communication tube 153 d in the front-rear direction.

[0289] A flange-shaped valve plate portion 122a is formed on the outer circumference of the valve body 122, located above the connecting tube portion 153d. This valve plate portion 122a is positioned on the upper surface of the valve seat portion 113e so that it can move upward. The elastically deformable portion 123 is formed so that it can elastically deform in the vertical direction. When the main cylinder 153 is pressurized, the valve body 122 is displaced upward, causing the elastically deformable portion 123 to compress and deform upward. As a result, the valve plate portion 122a moves upward from the valve seat portion 113e, allowing liquid to be supplied from the longitudinal supply tube portion 110 into the storage cylinder 190.

[0290] The cover 200 is formed to cover the entire vertical supply cylinder 110 excluding the lower end portion of the vertical supply cylinder 110 , the entire injection cylinder 111 , and the entire storage cylinder 190 from at least both sides in the left-right direction and from above.

[0291] like Figure 6 and Figure 7 As shown, a first connecting plate 210 is formed above the ejection tube 111 .

[0292] The first connecting plate 210 is formed in a plate shape extending forward from the upper end of the front wall portion 192 of the storage cylinder 190. Thus, the first connecting plate 210 is formed in a rectangular shape in plan view extending in the front-rear direction and the left-right direction.

[0293] The first connecting plate 210 has a locking hole 211 extending vertically therethrough. The shape of the locking hole 211 is not particularly limited, and the locking hole 211 may be formed to have an opening in a rectangular shape in plan view, for example.

[0294] Furthermore, a bulging portion 212 is formed on the upper surface of the first connecting plate 210 . The bulging portion 212 protrudes upward and contacts the cover 200 from below.

[0295] The bulge 212 is formed, for example, to bulge upward in a hemispherical shape when viewed in a longitudinal section and is formed to be long in the transverse direction so as to extend in the front-rear direction over the entire length of the first connecting plate 210. The pair of bulges 212 are arranged parallel to each other in the left-right direction with the locking hole 211 interposed therebetween.

[0296] However, the shape and / or formation position of the bulging portion 212 are not limited to this case and may be changed as appropriate.

[0297] The first connecting plate 210 contacts the cover 200 from below via the bulging portion 212 , and is thereby prevented from being displaced upward.

[0298] (Nozzle parts)

[0299] like Figure 6 and Figure 7 As shown, the nozzle member 103 is assembled to the injector body 102 mainly by utilizing the ejection tube portion 111 .

[0300] The nozzle component 103 includes: a mounting cylinder 220, which is embedded in the ejection cylinder 111 from the front; a limiting wall 221, which extends downward from the mounting cylinder 220; a connecting wall 222, which extends upward from the mounting cylinder 220; a nozzle shaft 223, which is located on the inner side of the front end portion of the mounting cylinder 220; and a second connecting plate 224, which extends rearward from the connecting wall 222.

[0301] The mounting cylinder 220 includes a front cylinder 220a extending forward from the limiting wall 221 and the connecting wall 222, and a rear cylinder 220b extending rearward from the limiting wall 221 and the connecting wall 222. The rear cylinder 220b of the mounting cylinder 220 is tightly fitted onto the ejection cylinder 111 from the front.

[0302] The rear side cylinder portion 220b of the mounting cylinder portion 220 is not fitted onto the ejection cylinder portion 111 over the entire length thereof, but is fitted onto the portion of the ejection cylinder portion 111 excluding the base end portion, i.e., the rear end portion (root side). Thus, the rear end edge of the rear side cylinder portion 220b is positioned forward of the front wall portion 192 with a gap in the front-to-back direction therebetween.

[0303] The nozzle shaft portion 223 is coaxially arranged with the ejection cylinder 111 inside the front cylinder portion 220a of the mounting cylinder 220. The central axis of the nozzle shaft portion 223 is located slightly above the axis O2 of the accumulator cylinder 190. The front end of the nozzle shaft portion 223 is located slightly rearward of the front end of the front cylinder portion 220a of the mounting cylinder 220.

[0304] A nozzle cap 225 is attached to the nozzle shaft 223. This cap 225 has a spray hole 104 formed therein, opening forward and ejecting liquid forward. The spray hole 104 is coaxially arranged with the ejection tube 111. A communication path (not shown) is provided between the outer surface of the nozzle shaft 223 and the inner surface of the nozzle cap 225, connecting the portion of the front tube 220a of the mounting tube 220 located further rearward than the nozzle shaft 223 with the spray hole 104.

[0305] By causing the lower edge of the restriction wall 221 to abut against the upper end of the trigger portion 151 from above, the restriction wall 221 positions the trigger portion 151 at the forwardmost swing position, thereby restricting the trigger portion 151 from further swinging forward.

[0306] The second connecting plate 224 is formed in a plate shape extending rearward from the upper end of the connecting wall 222. Thus, the second connecting plate 224 is formed in a rectangular shape in plan view that extends in the front-to-back and left-to-right directions, and is arranged parallel to the first connecting plate 210. The second connecting plate 224 is formed so as to be located between the mounting cylinder 220 and the first connecting plate 210, and is arranged so as to overlap the first connecting plate 210 from below.

[0307] The second connecting plate 224 is formed with a locking protrusion 226. The locking protrusion 226 projects upward and enters the locking hole 211 formed in the first connecting plate 210, locking from the rear with the locking hole 211. As a result, the entire nozzle component 103 is assembled in a state in which it is prevented from moving forward relative to the injection tube 111.

[0308] Furthermore, the second connecting plate 224 extends further rearward than the mounting cylinder 220, surrounding the rear end of the ejection cylinder 111. Furthermore, the second connecting plate 224 is sandwiched vertically between the first connecting plate 210 and the ejection cylinder 111. Specifically, a protrusion 227 is formed on the outer peripheral surface of the ejection cylinder 111, located further rearward than the mounting cylinder 220, on the rear end side. This protrusion 227 protrudes upward and, between this protrusion 227 and the first connecting plate 210, clamps the rear end of the second connecting plate 224 from below. In the illustrated example, the protrusion 227 is formed in the shape of a rib extending in the front-to-back direction.

[0309] In the trigger type liquid sprayer 1A, as Figure 6 and Figure 7 As shown, a displacement suppressing portion 250 is provided between the rear cylinder portion (rear cylinder portion) 197 of the storage cylinder 190 and the longitudinal supply cylinder portion 110 to suppress displacement of the rear cylinder portion 197 relative to the longitudinal supply cylinder portion 110. The displacement suppressing portion 250 includes a reinforcing rib 251 integrally formed on the longitudinal supply cylinder portion 110 and the rear cylinder portion 197 so as to integrally connect the longitudinal supply cylinder portion 110 and the rear cylinder portion 197.

[0310] The reinforcing rib 251 is formed to integrally connect the small-diameter portion 112b of the outer cylinder 112, which constitutes the longitudinal supply cylinder 110, with the rear cylinder portion 197. Specifically, the reinforcing rib 251 is formed on the rearward portion of the outer circumferential surface of the small-diameter portion 112b and is formed as a longitudinal rib extending along the entire vertical length of the small-diameter portion 112b. The lower end of the reinforcing rib 251 reaches the annular connecting portion 112c of the outer cylinder 112, forming an integral part thereof. The upper end of the reinforcing rib 251 reaches the rear cylinder portion 197, forming an integral part thereof.

[0311] Thus, the longitudinal supply cylinder 110 and the rear cylinder 197 are firmly connected as a whole via the reinforcing ribs 251. In particular, the reinforcing ribs 251 are arranged so as to be sandwiched between the annular connecting portion 112c and the rear cylinder 197 in the vertical direction, thereby effectively suppressing displacement of the rear cylinder 197 relative to the longitudinal supply cylinder 110 in the vertical direction.

[0312] In addition, if Figure 7 and Figure 9 As shown, the trigger-type liquid sprayer 1A of the present embodiment has an upper rib 260 integrally formed on the outer peripheral surface of the upper end portion of the storage cylinder 190 .

[0313] The upper rib 260 is formed to protrude upward and is arranged on the axis O1 of the longitudinal supply cylinder portion and extends in the front-to-back direction. Specifically, the upper rib 260 is formed to be arranged on the upper side of the cylinder 193 and is located at the connection portion between the front cylinder portion 196 and the step portion 198 in the cylinder 193.

[0314] The upper rib 260 includes: a front wall surface (first wall surface) 261, which faces the front side (the other axial side); a rear wall surface (second wall surface) 262, which faces the rear side (one axial side); a pair of side wall surfaces not shown, which face outward in the left and right directions and are connected relative to the front wall surface 261 and the rear wall surface 262; and a flat top wall surface 263, which is arranged at a position higher than the front cylinder portion 196 and is connected to the front wall surface 261, the rear wall surface 262 and a pair of side wall surfaces.

[0315] The front wall surface 261 and the rear wall surface 262 of the upper rib 260 are both formed as inclined surfaces that expand outward as they move downward from the top wall surface 263. The rear wall surface 262 is arranged so as to cover the step portion 198 from above and is connected to the boundary between the step portion 198 and the rear tube portion 197.

[0316] like Figure 9 As shown, the front wall surface 261 is formed as an inclined surface that is inclined so as to extend upward and rearward from the outer peripheral surface of the storage cylinder 190, that is, the outer peripheral surface of the front tube portion 196. Specifically, the front wall surface 261 is formed so that the inclination angle θ1 of the front wall surface 261 relative to the outer peripheral surface of the front tube portion 196 when the storage cylinder 190 is viewed from the side is an acute angle less than 90 degrees, that is, 65 degrees.

[0317] Furthermore, a first curved surface portion 265 is formed at the connection portion between the front wall surface 261 and the outer peripheral surface of the front tube portion 196. This first curved surface portion 265 is recessed toward the rear when viewed from the side of the storage cylinder 190. In the illustrated example, the first curved surface portion 265 is formed into a concave curved surface having a curvature radius of 2 mm when viewed from the side of the storage cylinder 190.

[0318] The connection portion between the front wall surface 261 and the top wall surface 263 is a curved surface with a curvature radius of 0.5 mm when viewing the storage cylinder 190 from the side. The curvature radius of the curved surface is not limited to 0.5 mm and may be changed as appropriate.

[0319] The rear wall surface 262 is formed as an inclined surface that is inclined so as to extend forward as it moves upward from the outer peripheral surface of the storage cylinder 190, that is, the outer peripheral surface of the rear tube portion 197, when the storage cylinder 190 is viewed from the side. Specifically, the rear wall surface 262 is formed so that the inclination angle θ2 of the rear wall surface 262 relative to the outer peripheral surface of the rear tube portion 197 when the storage cylinder 190 is viewed from the side is an acute angle less than 90 degrees, that is, 45 degrees.

[0320] Furthermore, a second curved surface portion 266 is formed at the connection portion between the rear wall surface 262 and the outer peripheral surface of the rear tube portion 197. This second curved surface portion 266 is recessed forward when viewed from the side of the storage cylinder 190. In the illustrated example, the second curved surface portion 266 is formed into a concave curved surface having a curvature radius of 2 mm when viewed from the side of the storage cylinder 190.

[0321] The connection portion between the rear wall surface 262 and the top wall surface 263 is a curved surface with a curvature radius of 0.5 mm when viewing the storage cylinder 190 from the side. The curvature radius of this curved surface is not limited to 0.5 mm and may be changed as appropriate.

[0322] In addition, if Figure 8 、 Figures 10 to 12 As shown, the trigger-type liquid sprayer 1A of this embodiment has a connection reinforcement portion 270 formed on the rear side of the tube fitting tube 113h constituting the inner tube 113. This connection reinforcement portion 270 integrally connects the tube fitting tube 113h and the large-diameter portion 113a in the radial direction. This improves the strength of the rear side of the annular connection portion 113c and enhances its rigidity.

[0323] In particular, the connection reinforcement portion 270 is formed into a circular arc shape extending circumferentially between the tube fitting tube 113h and the large diameter portion 113a when viewed from above, and is integrally formed to connect with the annular connection portion 113c from below. This effectively increases the strength of the rear portion of the annular connection portion 113c, thereby enhancing its rigidity. Furthermore, since the connection reinforcement portion 270 extends circumferentially, it can integrally connect the rear portion of the tube fitting tube 113h to the large diameter portion 113a over a wider range, further enhancing the rigidity of the rear portion of the annular connection portion 113c.

[0324] In this embodiment, if Figure 11As shown, the connection reinforcement portion 270 is formed on the rear side of the tube fitting tube 113h. Furthermore, the connection reinforcement portion 270 is formed in a plan view in a circular arc shape, perpendicular to the axis O1, and extending circumferentially around an imaginary line O3 extending in the front-to-back direction, extending over a predetermined angle θ3 on both sides. In the illustrated example, the angle θ3 is set to 50 degrees.

[0325] It should be noted that the angle θ3 formed by the connection reinforcement portion 270 is not limited to 50 degrees, but is preferably 22 degrees or greater (or 1.5 mm or greater if defined by the circumferential width along the circumferential direction).

[0326] Furthermore, in this embodiment, the peripheral end portion of the connection reinforcement portion 270 is formed by two concave curved surface portions 271 that are recessed inward in the circumferential direction when viewed from above. One curved surface portion 271 is connected to the outer circumferential surface of the tube fitting tube 113h, while the other curved surface portion 271 is connected to the inner circumferential surface of the large-diameter portion 113a. Furthermore, the first curved surface portion 271 and the second curved surface portion 271 are connected to each other.

[0327] In the example shown in the figure, the two curved surface portions 271 are formed with the same curvature radius in a plan view. Specifically, the two curved surface portions 271 are formed in a concave curved surface shape with a curvature radius of 0.65 mm in a plan view.

[0328] It should be noted that the curvature radius of the curved surface portion 271 is not limited to 0.65 mm, and is preferably 0.5 mm or greater.

[0329] When the curvature radius of the curved surface portion 271 is less than 0.5 mm, the entire inner cylinder 113 including the connection reinforcement portion 270 (see Figure 10 ) When injection molding is performed, the front end of the mold for the part of the molding mold that molds the connection reinforcement portion 270, that is, the C-shaped mold portion when viewed from above, has to be made too thin, making it difficult to maintain the durability of the mold.

[0330] However, by setting the curvature radius of the curved surface portion 271 to 0.5 mm or more, the mold durability can be maintained.

[0331] It should be noted that the two curved surface portions 271 do not need to be formed with the same curvature radius when viewed from above, and may, for example, be formed with different curvature radii. Furthermore, the peripheral end portion of the connection reinforcement portion 270 is not limited to being formed by connecting the two curved surface portions 271 to each other. For example, a straight portion may be formed between the two curved surface portions 271, and the two curved surface portions 271 may be connected via the straight portion.

[0332] (The function of the trigger liquid sprayer)

[0333] The trigger-type liquid ejector 1A is used as described above. The trigger 151 is repeatedly operated to fill various parts of the trigger-type liquid ejector 1A with liquid, allowing the liquid to be drawn into the vertical supply cylinder 110 .

[0334] In dismantling Figure 6 After releasing the stopper T shown, if the trigger portion 151 is pulled rearward against the biasing force of the coil spring 154, the master piston 152 moves rearward from its forwardmost position, pressurizing the interior of the master cylinder 153. Consequently, the liquid within the master cylinder 153 is supplied through the connecting tube 153d into the inner tube 113 of the longitudinal supply tube 110. The liquid supplied to the inner tube 113 then presses downward on the ball valve 119 located at the upper opening edge of the support tube 116, pushing up the valve body 122 of the accumulator valve 120, causing the valve plate 122a to separate from the upper surface of the valve seat 113e.

[0335] Thus, the liquid in the vertical supply cylinder 110 can be passed through Figure 7 The liquid is supplied to the storage space 190a of the storage cylinder 190 through the through-hole 113f, the through-hole 131a, the interior of the connecting tube 130, and the supply hole 191, thereby pressurizing the storage space 190a. Therefore, as the storage space 190a is pressurized, the storage plunger 180 can be moved backward from the maximum forward position against the force of the biasing member 181, and the liquid can be accumulated (filled) in the storage space 190a.

[0336] In the initial stage of liquid introduction into the storage space 190a, the liquid enters the gap between the inner peripheral surface of the front lip 125a and the outer peripheral surface of the front end of the plunger tube 125. Therefore, the storage plunger 180 is easily moved rearward.

[0337] By moving the accumulating plunger 180 rearward, the sealing wall 126 moves rearward away from the front wall portion 192 of the accumulating cylinder 190. This opens the communicating hole 195, and the liquid in the accumulating space 190a, whose pressure has been increased, is guided to the injection hole 104 through the communicating hole 195 and the ejection tube 111. As a result, the liquid can be ejected forward from the injection hole 104.

[0338] As described above, every time the trigger portion 151 is pulled rearward, the liquid can be ejected from the injection hole 104 , and the accumulation plunger 180 can be moved rearward to accumulate the liquid in the accumulation space 190 a .

[0339] Thereafter, when the trigger 151 is released, the primary piston 152 returns forward within the master cylinder 153 due to the elastic restoring force (biasing force) of the coil spring 154, causing the trigger 151 to also return forward. This reduces the pressure within the master cylinder 153 to a pressure lower than that within the container A. This allows the ball valve 119 to move upward away from the upper opening edge of the support cylinder 116 while the valve body 122 of the accumulation valve 120 is pressed against the upper surface of the valve seat 113e. Consequently, the liquid within the container A is drawn into the vertical supply cylinder 110 and then introduced into the master cylinder 153 through the support cylinder 116 and the connecting cylinder 153d.

[0340] This makes it possible to prepare for the next injection.

[0341] It should be noted that when the rearward operation of the trigger portion 151 is stopped, the supply of liquid to the storage space 190a through the longitudinal supply cylinder 110 and the connecting cylinder 130 is stopped, but the storage plunger 180 begins to move forward toward the most advanced position due to the force of the biasing member 181.

[0342] It should be noted that, at this time, the outflow of the liquid from the storage space 190 a into the vertical supply cylinder 110 is restricted by the storage valve 120 .

[0343] Thus, the liquid accumulated in the storage space 190 a can be guided to the injection hole 104 through the communication hole 195 and the injection tube 111 , and the liquid can be continuously injected forward through the injection hole 104 .

[0344] In this manner, liquid can be ejected not only when the trigger portion 151 is pulled rearward but also when the trigger portion 151 is not operated, and continuous ejection of liquid is possible.

[0345] If the trigger 151 is pulled rearward with the accumulating plunger 180 at the most retracted position, excessive liquid may be supplied to the accumulating space 190a, causing leakage or damage to various parts.

[0346] However, in this embodiment, when the accumulation plunger 180 moves rearward to a certain extent, the front lip 125a reaches the communication groove 194, thereby allowing the accumulation space 190a to communicate with the interior of the container body A through the communication groove 194, the recovery hole 199, and the recovery passage 117. In other words, when the accumulation plunger 180 moves rearward, the accumulation space 190a can communicate with the interior of the container body A via the recovery passage 117.

[0347] Therefore, a portion of the liquid in the storage space 190a can be returned to the container body A, and excessive liquid supply to the storage space 190a can be suppressed. As a result, the pressure in the storage space 190a can be suppressed from excessively increasing, and leakage and damage to various parts can be suppressed.

[0348] As described above, according to the trigger-type liquid sprayer 1A of this embodiment, liquid can be ejected not only when the trigger portion 151 is pulled rearward but also when the trigger portion 151 is not operated, and liquid can be ejected continuously.

[0349] It should be noted that the upper end (fulcrum) of the trigger portion 151 is pivotally supported on the nozzle member 103 in a swingable manner, and the main piston 152 is locked to the middle portion (action point) of the trigger portion 151. Therefore, by operating the lower end (force point) of the trigger portion 151, for example, the main piston 152 can be efficiently moved using the so-called lever principle. Therefore, the operability of the trigger portion 151 can be improved.

[0350] Furthermore, according to the trigger type liquid sprayer 1A of this embodiment, as Figure 8 As shown, a connection reinforcement portion 270 is provided at the rear portion of the tube-fitting tube 113h, radially and integrally connecting the large-diameter portion 113a, which fits inside the mouth A1 of the container body A, to the tube-fitting tube 113h. This increases the strength and rigidity of the rear portion of the annular connection portion 113c. This prevents the rear portion of the annular connection portion 113c from bending or tipping, even if the accumulation cylinder 190 is subjected to an impact force, such as from a drop or contact with an external source. This prevents the rear portion of the annular connection portion 113c from shifting, such as by bending or toppling. This prevents cracks and other problems from occurring at the connection between the rear portion of the annular connection portion 113c and the tube-fitting tube 113h. Furthermore, the connection reinforcement portion 270 can be expected to increase the rigidity of the tube-fitting tube 113h, thereby also preventing the aforementioned problems.

[0351] like Figure 6 As shown by the arrow F1, when an impact force is applied to the rear end portion of the rear cylinder 197 due to a drop impact, the rear cylinder 197 is displaced such as bending downward due to the rotational torque caused by the impact force, thereby transmitting the impact force to the longitudinal supply cylinder 110, which may cause the longitudinal supply cylinder 110 to be displaced such as bending or tilting. Figure 6As shown by the arrow F2, when an impact force acts on the nozzle component 103 side, the rear cylinder 197 is displaced such as being lifted upward due to the rotational torque caused by the impact force, so that the impact force is transmitted to the longitudinal supply cylinder 110 and it is possible to cause the longitudinal supply cylinder 110 to be displaced such as bending or tilting, for example.

[0352] Even in such a case, the displacement of the rear part of the annular connecting portion 113c can be suppressed by connecting the reinforcement portion 270, and on this basis, the rigidity of the tube fitting tube 113h can be improved, thereby suppressing the occurrence of cracks and other defects in the connection portion between the rear part of the annular connecting portion 113c and the tube fitting tube 113h (for example, the root part of the tube fitting tube 113h).

[0353] This improves the rigidity against unexpected external forces and the shock resistance of the trigger-type liquid injector 1A. As a result, a high-quality trigger-type liquid injector 1A with strong rigidity against drop shocks, contact shocks, and the like can be achieved. Furthermore, because shock resistance can be improved, the internal volume (internal capacity) within the accumulation cylinder 190 can be further increased by, for example, forming the rear cylinder 197 longer and further rearward than the longitudinal supply cylinder 110. This allows for further liquid to be stored within the accumulation cylinder 190, making the trigger-type liquid injector 1A suitable for continuous injection.

[0354] As described above, according to the trigger-type liquid ejector 1A of the present embodiment, since the connection reinforcement portion 270 is provided, the trigger-type liquid ejector 1A can be provided with excellent impact resistance.

[0355] Furthermore, the connection reinforcement portion 270 is formed in a plan view arc shape extending in the circumferential direction between the pipe fitting cylinder 113h and the large diameter portion 113a, and is integrally formed so as to be connected to the annular connection portion 113c from below.

[0356] This effectively increases the strength of the rear portion of the annular connecting portion 113c, improving its rigidity. Furthermore, since the connection reinforcement portion 270 extends circumferentially, the rear portion of the tube fitting tube 113h and the large-diameter portion 113a can be integrally connected over a wider range, further enhancing the rigidity of the rear portion of the annular connecting portion 113c. Consequently, cracks and other defects can be effectively prevented from occurring at the base of the tube fitting tube 113h.

[0357] Furthermore, according to the trigger type liquid sprayer 1A of this embodiment, as Figure 9As shown, an upper rib 260 is formed on the storage cylinder 190. Furthermore, the front wall surface 261 of the upper rib 260 is not a perpendicular surface, such as a right angle, relative to the outer peripheral surface of the front tube portion 196 of the storage cylinder 190, but is an inclined surface having an inclination angle θ1 of 65 degrees. Furthermore, a first curved surface portion 265 is formed at the connection between the front wall surface 261 and the outer peripheral surface of the front tube portion 196.

[0358] Similarly, the rear wall surface 262 of the upper rib 260 is set as an inclined surface with an inclination angle θ2 of 45 degrees relative to the outer peripheral surface of the rear tube portion 197 of the storage cylinder body 190, and on this basis, a second curved surface portion 266 is formed in the connecting part between the rear wall surface 262 and the outer peripheral surface of the rear tube portion 197.

[0359] Thus, even if an impact force acts on the storage cylinder 190 due to, for example, falling, and the storage cylinder 190 is displaced such as bending in the vertical direction due to the resulting rotational torque, it is possible to suppress the occurrence of defects such as cracks in the connection parts between the storage cylinder 190 and the front wall surface 261 and the rear wall surface 262.

[0360] Furthermore, according to the trigger-type liquid injector 1A of this embodiment, the lower end of the recovery passage 117 is sealed from below by the annular connecting portion 113c of the inner tube 113. Therefore, even if an impact force acts on the trigger-type liquid injector 1A, resulting in a high load on the rear portion of the vertical supply cylinder 110, it is unlikely to cause problems such as damage to the vertical supply cylinder 110 starting from the lower end of the recovery passage 117. In particular, the annular connecting portion 113c that seals the lower end of the recovery passage 117 is strengthened by being connected to the reinforcing portion 270, making such problems less likely to occur.

[0361] Furthermore, in the trigger-type liquid ejector 1A of this embodiment, as Figure 6 As shown, a displacement suppression portion 250 is provided between the rear cylinder portion 197 in the accumulation cylinder 190 and the longitudinal supply cylinder portion 110 to suppress the displacement of the rear cylinder portion 197 relative to the longitudinal supply cylinder portion 110. Therefore, even if a falling impact or the like acts on the accumulation cylinder 190, the displacement (deformation) of the rear cylinder portion 197, for example, in the up and down directions, can be suppressed.

[0362] Therefore, as mentioned above, Figure 6As shown by arrow F1, even if an external force acts on the rear end of rear tube portion 197 due to a drop impact or the like, the presence of displacement suppressing portion 250 suppresses displacement such as downward bending of rear tube portion 197. This improves rigidity against unexpected external forces and enhances the impact resistance of trigger-type liquid sprayer 1A. Furthermore, since the burden on upper rib 260 and connection reinforcement portion 270 is reduced, the occurrence of cracks and the like can be effectively suppressed.

[0363] In addition, since the longitudinal rib-shaped reinforcement rib 251 connects the longitudinal supply cylinder 110 and the rear cylinder 197 as a whole, the rigidity of the connection portion between the longitudinal supply cylinder 110 and the rear cylinder 197 can be effectively improved. Figure 6 As shown by arrow F2, even when an external force acts on the nozzle member 103 side due to a drop impact or the like, displacement of the rear cylinder portion 197 upward due to rotational torque or the like can be effectively suppressed.

[0364] Furthermore, in the trigger-type liquid sprayer 1A of this embodiment, the nozzle member 103 is assembled to the sprayer body 102 by fitting the mounting cylinder 220 onto the ejection cylinder 111. Furthermore, by fitting the mounting cylinder 220 onto the ejection cylinder 111, the second connecting plate 224 overlaps the first connecting plate 210 from below with the locking protrusion 226 locked with the locking hole 211 from behind, and the second connecting plate 224 is sandwiched vertically between the first connecting plate 210 and the ejection cylinder 111.

[0365] Therefore, it is possible to suppress the nozzle member 103 from falling off (nozzle falling off) by moving forward relative to the injection tube 111, and suppress the nozzle member 103 from being displaced in the vertical direction relative to the injector body 102.

[0366] While preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments. Additional, omitted, replaced, and other modifications may be made to the structure 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 appended claims.

[0367] As a component that urges the trigger part 51, 151 and the piston (main piston) 52, 152 forward, for example, a pair of resin springs arranged on both sides of the ejection cylinder 11, 111 in the left-right direction and connected to the trigger part 51, 151 can be used instead of the coil spring 54, 154.

[0368] The trigger parts 51 and 151 may be provided so as to be able to slide linearly, for example.

[0369] While the above embodiment shows a configuration in which the accumulating plungers 80, 180 close the communicating holes 95, 195 and then open the communicating holes 95, 195 when moving rearward against the biasing members 81, 181, the present invention is not limited to this configuration. For example, a configuration in which the accumulating plungers 80, 180 close the supply holes 91, 191 formed in the accumulating cylinders 90, 190 and then open the supply holes 91, 191 when moving rearward against the biasing members 81, 181 may also be employed.

[0370] In the above embodiment, the nozzle member 3, 103 is described as being fitted with the ejection tube 11, 111, but the present invention is not limited to this structure. For example, the nozzle member 3, 103 may be directly connected to the front of the storage cylinder 90, 190.

[0371] In the above embodiment, the communication openings 18a and 118a are formed at the lower end portions of the residual pressure relief passages 18 and 118 , but the present invention is not limited to this structure.

[0372] In the above embodiment, the communication openings 18a, 118a are arranged at the front end of the longitudinal supply cylinder 10, 110, but are not limited to this structure. The communication openings 18a, 118a may not be arranged at the front end of the longitudinal supply cylinder 10, 110. For example, other structures in which the communication openings 18a, 118a are arranged at a position further forward than the recovery passage 17, 117 may be appropriately adopted. For example, the communication openings 18a, 118a may also be provided at the side ends (ends in the left and right directions) of the longitudinal supply cylinder 10, 110. In this case, it is preferred that the communication openings 18a, 118a are provided only at one of the two side ends of the longitudinal supply cylinder 10, 110. In addition, in this case, it is preferred that not only the lower end of the recovery passage 17, 117 but also the lower end of the residual pressure release passage 18, 118 is closed from below. In this case, by providing a second connecting passage (not shown) extending from the residual pressure release passage 18, 118 to the circumferential direction (rearward) of the longitudinal supply cylinder 10, 110, it is possible to preferably adopt a structure in which the residual pressure release passage 18, 118 is connected to the container body A through the second connecting passage and the connecting openings 18a, 118a.

[0373] In the above embodiment, the accumulating cylinders 90 and 190 are described as protruding rearward relative to the vertical supply cylinders 10 and 110, but the present invention is not limited to this configuration. The accumulating cylinders 90 and 190 may also protrude vertically and / or horizontally relative to the vertical supply cylinders 10 and 110. Furthermore, the accumulating cylinders 90 and 190 may have an increased outer diameter while reducing the amount of protrusion from the vertical supply cylinders 10 and 110.

[0374] In the second embodiment described above, the connection reinforcement portion 270 is formed into a circular arc shape extending circumferentially in a plan view, but the present invention is not limited to this configuration. For example, the connection reinforcement portion 270 may be formed into a slender bridge shape extending radially. Furthermore, a plurality of bridge-shaped connection reinforcement portions may be formed at intervals along the circumferential direction.

[0375] Furthermore, within the scope not departing from the gist of the present invention, components in the above-described embodiments may be appropriately replaced with known components, and the above-described modifications may be appropriately combined.

[0376] Industrial applicability

[0377] According to the present invention, a trigger-type liquid sprayer capable of improving impact resistance can be provided.

Claims

1. A trigger-type liquid sprayer, characterized in that: have: an injector body mounted on a container body for accommodating liquid; and a nozzle member mounted on the front end of the injector body and having a spray hole for spraying liquid forward; The injector body has: a longitudinal supply cylinder extending in an up-down direction and absorbing the liquid in the container body; a trigger mechanism having a trigger portion disposed in front of the longitudinal supply cylinder so as to be movable rearward when urged forward, the trigger mechanism causing liquid to flow from within the longitudinal supply cylinder toward the injection port by the rearward movement of the trigger portion; an accumulating cylinder which supplies the liquid having passed through the longitudinal supply tube portion to the interior thereof as the trigger portion moves rearward; and The accumulating plunger is arranged in the accumulating cylinder so as to be movable in the axial direction along the central axis of the accumulating cylinder, moves toward one side of the axial direction as liquid is supplied into the accumulating cylinder, and is urged toward the other side of the axial direction by an urging member. The longitudinal supply cylinder is provided with: a recovery passage, which is arranged at the rear end of the longitudinal supply cylinder and extends downward from the accumulation cylinder, and the lower end of the recovery passage is closed from below; a communication passage extending from the recovery passage along the circumference of the longitudinal supply cylinder; as well as A communication opening is arranged at a position further forward than the recovery passage, connecting the communication passage with the container body, The trigger mechanism comprises: a main piston that moves back and forth as the trigger portion moves; and The main cylinder body pressurizes and depressurizes its interior as the main piston moves, and its interior is connected to the longitudinal supply cylinder. A residual pressure relief passage is provided at the front end portion of the longitudinal supply cylinder. The residual pressure relief passage extends downward from the main cylinder and opens into the container body. The communication passage connects the recovery passage and the residual pressure release passage. The communication opening is formed by a lower end portion of the residual pressure relief passage.

2. The trigger-type liquid sprayer according to claim 1, wherein: The communication opening is arranged at the front end portion of the vertical supply cylinder.

3. The trigger-type liquid sprayer according to claim 1 or 2, characterized in that: The longitudinal supply cylinder comprises: outer cylinder; and an inner cylinder, which is embedded in the outer cylinder, The recovery passage and the communication passage are provided between the outer tube and the inner tube.

4. The trigger-type liquid sprayer according to claim 1, wherein: The storage cylinder is arranged above the longitudinal supply cylinder and is arranged to intersect with the central axis of the longitudinal supply cylinder and protrude further to one side in the axial direction than the longitudinal supply cylinder. The vertical supply cylinder portion includes an outer cylinder formed integrally with the storage cylinder, and an inner cylinder fitted inside the outer cylinder. The inner cylinder has: a large diameter portion fitted into the inner side of the mouth of the container body; a small diameter portion, which is arranged radially inward of the large diameter portion and has a tube fitted therein for sucking liquid from the container body; and an annular connecting portion that connects the inner circumference of the large diameter portion and the outer circumference of the small diameter portion in the radial direction; An annular pipe fitting cylinder is formed in the small diameter portion and protrudes downward from the annular connecting portion. A connection reinforcement portion is formed at a rear portion of the tube fitting cylinder, and the connection reinforcement portion integrally connects the tube fitting cylinder and the large diameter portion in a radial direction.

5. The trigger-type liquid sprayer according to claim 4, wherein: The connection reinforcement portion is formed to be connected to the annular connection portion from below.

6. The trigger-type liquid sprayer according to claim 4 or 5, characterized in that: The connection reinforcement portion is formed to extend in the circumferential direction between the pipe fitting cylinder and the large diameter portion.

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