Trigger type liquid injector

Abstract

To provide a trigger type liquid injector which can reduce environmental load and can realize easy disposal by a user.SOLUTION: An injector body 2 comprises: an accumulation cylinder 40 into which a liquid is supplied by rearward movement of a trigger part 71; an accumulation plunger 45 which is so located in the accumulation cylinder 40 as to be movable in a cross direction, and moves rearward in association with supply of the liquid into the accumulation cylinder 40; and a plunger energization member 60 which energizes the accumulation plunger 45 forward. A trigger mechanism 70 comprises: a main cylinder 72 which is located in the rear of the trigger part 71, and extends in the cross direction; a main piston 73 which is connected to the trigger part 71, and is so fitted into the main cylinder 72 as to be slidable forward and rearward; and a trigger energization member 75 which energizes the trigger part 71 forward. The plunger energization member 60 and the trigger energization member 75 are formed from a non-metal soft material.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Trigger-type liquid ejectors have been known in the past, such as those shown in Patent Document 1 below, which include an ejector body attached to a container body containing liquid, and a nozzle member attached to the ejector body and formed with an ejection hole through which the liquid is ejected, the ejector body having a vertical supply tube section that sucks up the liquid from the container body, and a trigger section arranged so as to be movable rearward while being biased forward, and which cause the liquid to flow from the vertical supply tube section toward the ejection hole as the trigger section moves rearward, a storage cylinder into which the liquid that has passed through the vertical supply tube section is supplied as the trigger section moves rearward, a storage plunger arranged within the storage cylinder so as to be movable in the axial direction along the central axis of the storage cylinder, and which moves toward one side of the axial direction as liquid is supplied into the storage cylinder and is biased toward the other side, and a plunger biasing member that biases the storage plunger toward the other side, and which are capable of continuously ejecting liquid through the ejection hole.

[0003] In this trigger-type liquid sprayer, the trigger mechanism comprises a main cylinder disposed behind the trigger section and extending in the forward and backward directions, a main piston whose front end is connected to the trigger section and whose rear end is fitted within the main cylinder so as to be able to slide forward and backward, and a trigger biasing member disposed between the rear end of the main piston and the trigger section to bias the trigger section forward. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-98189 Summary of the Invention [Problem to be solved by the invention]

[0005] However, conventional trigger-type liquid ejectors have the problem that it is difficult to remove the biasing member from the ejector body, and it is difficult to separate the metallic biasing member from the other components made of synthetic resin. For this reason, from the perspective of reducing environmental impact and facilitating disposal by users, there is a demand for trigger-type liquid ejectors that do not use metallic biasing members.

[0006] SUMMARY OF THE INVENTION The present invention provides a trigger-type liquid ejector that reduces the environmental impact and allows users to easily dispose of the device. [Means for solving the problem]

[0007] A trigger-type liquid ejector according to a first aspect of the present invention comprises an ejector body attached to a container body containing liquid, and a nozzle member attached to the ejector body and having an ejection hole formed therein for ejecting liquid, the ejector body having a vertical supply tube portion that sucks up liquid from the container body, and a trigger portion disposed in front of the vertical supply tube portion so as to be movable rearward in a forward biased state, a trigger mechanism that causes liquid to flow from inside the vertical supply tube portion to the ejection hole side by the rearward movement of the trigger portion, a storage cylinder into which liquid that has passed through the vertical supply tube portion is supplied by the rearward movement of the trigger portion, and a trigger mechanism that causes liquid to flow from inside the vertical supply tube portion to the ejection hole side by the rearward movement of the trigger portion. the trigger mechanism comprises a storage plunger arranged within the cylinder so as to be movable in an axial direction along the central axis of the storage cylinder, and which moves to a first axial side as liquid is supplied into the storage cylinder, and a plunger biasing member which biases the storage plunger to a second axial side; the trigger mechanism comprises a main cylinder arranged behind the trigger portion and extending in the forward / backward direction, a main piston connected to the trigger portion and fitted within the main cylinder so as to be slidable back and forth, and a trigger biasing member which biases the trigger portion forward; and the plunger biasing member and the trigger biasing member are formed from a non-metallic soft material.

[0008] According to the first aspect, the plunger biasing member and the trigger biasing member are formed from a non-metallic material, which reduces the environmental impact and simplifies disposal by users. Furthermore, for example, a trigger-type liquid ejector can be realized in which all components are formed from a recyclable material, such as synthetic resin. As a result, when disposing of the trigger-type liquid ejector, it is not necessary to separate the plunger biasing member and the trigger biasing member from other components. This makes disposal easier for users.

[0009] A trigger-type liquid ejector according to a second aspect of the present invention may be the trigger-type liquid ejector according to the first aspect, wherein the plunger biasing member is arranged on the first side of the storage plunger, the main piston has a front end connected to the trigger portion and a rear end fitted within the main cylinder so as to be able to slide back and forth, and the trigger biasing member is arranged between the rear end of the main piston and the trigger portion.

[0010] According to the second aspect, the plunger biasing member and the trigger biasing member do not come into contact with the liquid flowing through the trigger-type liquid ejector, so that the transfer of the smell of the plunger biasing member and the trigger biasing member to the liquid can be prevented.

[0011] A trigger-type liquid ejector according to a third aspect of the present invention may be a trigger-type liquid ejector according to the first or second aspect above, wherein the storage plunger is formed in a cylindrical shape that opens to the first side, and the plunger biasing member may include a plunger-side contact portion that contacts the opening edge of the first side of the storage plunger, a cylinder-side contact portion that is pressed inside the storage plunger and whose movement toward the first side relative to the storage cylinder is restricted, and a connection portion that connects the plunger-side contact portion and the cylinder-side contact portion and is positioned inside the storage plunger in an extended state.

[0012] According to the third aspect, the connecting portion functions as an expandable portion that generates the biasing force of the plunger biasing member. Because this expandable portion is pressed into the inside of the storage plunger, it is possible to prevent the expandable portion of the plunger biasing member from being positioned on the first side of the storage plunger. This reduces the axial placement space for the plunger biasing member, thereby enabling the trigger-type liquid ejector to be made smaller. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a trigger-type liquid ejector that reduces the environmental load and makes it easy for users to dispose of it. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 2 is a vertical cross-sectional view of the trigger-type liquid ejector according to the embodiment. [Figure 2] 2 is an enlarged view showing the periphery of a plunger biasing member in the trigger-type liquid ejector of FIG. 1. FIG. [Figure 3] FIG. 2 is an enlarged view showing the periphery of the main cylinder in the trigger-type liquid ejector of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] An embodiment of a trigger-type liquid ejector according to the present invention will be described below with reference to Figures 1 to 3. In this embodiment, a ejection container in which a trigger-type liquid ejector is attached to a container body will be described as an example.

[0016] FIG. 1 is a vertical cross-sectional view of a trigger-type liquid ejector according to an embodiment. As shown in Figure 1, the trigger-type liquid sprayer 1 of this embodiment is attached to a container body A that contains a foamable liquid and comprises a sprayer body 2 having a vertical supply tube portion 10 that sucks up the liquid, a nozzle member 3 attached to the sprayer body 2 and having ejection holes 4 that eject the liquid, and a cover body 100 that covers the sprayer body 2 and the nozzle member 3. Unless otherwise specified, each component part of the trigger-type liquid sprayer 1 is a molded product made of synthetic resin.

[0017] In this embodiment, the central axis of the vertical supply tube portion 10 is defined as axis O1, the side of the container body A along this axis O1 is defined as the lower side, the opposite side is defined as the upper side, and the direction along axis O1 is defined as the up-down direction. In addition, in a plan view seen from the up-down direction, the ejection holes 4 open in a direction intersecting with axis O1, and the direction in which the ejection holes 4 open is defined as the front side, and the opposite direction is defined as the rear side. In addition, the direction perpendicular to both the up-down direction and the front-rear direction in a plan view is defined as the left-right direction.

[0018] The ejector body 2 mainly includes a vertical supply tube portion 10, a connecting tube portion 20, a cylinder tube portion 30, a storage cylinder 40, a storage plunger 45, an injection tube portion 50, a trigger mechanism 70, a ball valve 17, and a storage valve 19.

[0019] The vertical supply tube section 10 extends vertically and sucks up the liquid inside the container body A. The vertical supply tube section 10 is attached to the container body A by an attachment cap 14. The upper part of a pipe 15 that extends vertically and sucks up the liquid from the container body A is fitted into the vertical supply tube section 10. The vertical supply tube section 10 includes an outer tube 11 having a top and an inner tube 12 fitted into the outer tube 11. The outer tube 11 is formed integrally with the cylinder tube section 30, the storage cylinder 40, and the injection tube section 50, and is provided as a single member.

[0020] The connecting tube portion 20 is provided in front of the vertical supply tube portion 10. The connecting tube portion 20 extends forward from the upper end of the vertical supply tube portion 10. The rear end of the connecting tube portion 20 is formed integrally with the upper end of the outer tube 11 of the vertical supply tube portion 10. Both ends in the front-to-rear direction of the connecting tube portion 20 are open. The rear end opening of the connecting tube portion 20 is connected to the interior of the upper end of the vertical supply tube portion 10. A blocking plug is tightly fitted into the front end opening of the connecting tube portion 20.

[0021] The cylinder tubular portion 30 is provided in front of the vertical supply tubular portion 10. The cylinder tubular portion 30 protrudes forward from the vertical supply tubular portion 10, opens forward, and is formed in a bottomed tubular shape having a rear wall. The rear wall of the cylinder tubular portion 30 is formed integrally with the outer tube 11 of the vertical supply tubular portion 10.

[0022] The storage cylinder 40 is disposed above the vertical supply tube section 10 and the connecting tube section 20. The lower end of the storage cylinder 40 is integrally formed with the upper end of the outer tube 11 of the vertical supply tube section 10 and the upper end of the connecting tube section 20. The interior of the storage cylinder 40 is connected to the interior of the connecting tube section 20, forming a storage space 40a to which liquid that has passed through the vertical supply tube section 10 and the connecting tube section 20 is supplied. The central axis of the storage cylinder 40 is referred to as the axis O2. In this embodiment, the axis O2 extends in the front-to-rear direction. Note that the axis O2 may extend in a direction that intersects the front-to-rear direction when viewed from the top-to-bottom direction.

[0023] The storage cylinder 40 includes a cylindrical front tubular portion 41 with a bottom that opens rearward, a stepped portion 42 that protrudes radially outward from the rear-end opening edge of the front tubular portion 41 and extends around the entire circumference, and a rear tubular portion 43 that extends rearward from the outer circumferential edge of the stepped portion 42. The front tubular portion 41 defines a storage space 40a. A communication hole 41a that penetrates in the front-rear direction is formed in the bottom wall of the front end of the front tubular portion 41. A recessed portion 42a that opens rearward is formed in the rear surface of the stepped portion 42. The recessed portion 42a extends continuously in an annular shape around the entire circumference of the axis O2.

[0024] The injection tube portion 50 is disposed in front of the storage cylinder 40. The injection tube portion 50 extends forward from the storage cylinder 40. The rear end of the injection tube portion 50 is integrally formed with the front end of the storage cylinder 40 and the front end of the cylinder tube portion 30. The interior of the injection tube portion 50 communicates with the interior of the storage cylinder 40 (storage space 40a) through a communication hole 41a of the front tube portion 41 of the storage cylinder 40. The interior of the injection tube portion 50 communicates with the interior of the vertical supply tube portion 10 through the interior of the storage cylinder 40 and the interior of the connecting tube portion 20. The injection tube portion 50 guides the liquid that has passed through the interior of the vertical supply tube portion 10, the interior of the connecting tube portion 20, and the interior of the storage cylinder 40 to the ejection hole 4.

[0025] A nozzle member 3 is fitted onto the injection tube portion 50 from the front. The nozzle member 3 is assembled to the ejector body 2. The nozzle member 3 is formed with an ejection hole 4 that opens to the front and ejects liquid forward. The nozzle member 3 comprises an attachment tube portion 3a that is fitted onto the injection tube portion 50 from the front, and a nozzle tube 3b that is attached to the front end of the attachment tube portion 3a. The nozzle tube 3b has an ejection hole 4 formed in it. The nozzle tube 3b foams the liquid ejected from the ejection hole 4.

[0026] The storage plunger 45 is disposed within the storage cylinder 40 so as to be movable in the front-rear direction. The storage plunger 45 includes a sliding cylindrical portion 46 that slides tightly in the front-rear direction along the entire inner circumferential surface of the front cylindrical portion 41 of the storage cylinder 40. The rear end of the storage plunger 45 protrudes rearward beyond the stepped portion 42 of the storage cylinder 40. At the most forward position, the storage plunger 45 closes the communication hole 41a of the storage cylinder 40 to block communication between the interior of the vertical supply cylindrical portion 10 and the ejection hole 4 (in the injection cylindrical portion 50). When the storage plunger 45 moves rearward from the most forward position, it connects the interior of the vertical supply cylindrical portion 10 and the ejection hole 4 (in the injection cylindrical portion 50). Within the storage cylinder 40, the space located forward of the sliding cylindrical portion 46 functions as a storage space 40a.

[0027] The storage space 40a stores the liquid that has passed through the connecting tube portion 20. The storage space 40a expands as the storage plunger 45 moves rearward (to the first side) due to the supply of liquid. The storage space 40a is in communication with the interior of the vertical supply tube portion 10 through the connecting tube portion 20. The storage space 40a can also be in communication with the interior of the injection tube portion 50. When the storage plunger 45 is in the most forward position, the storage space 40a is cut off from communication with the interior of the injection tube portion 50. When the storage plunger 45 is retracted from the most forward position, the storage space 40a is in communication with the interior of the injection tube portion 50.

[0028] The plunger biasing member 60 is disposed within the storage cylinder 40. The plunger biasing member 60 is disposed behind the storage plunger 45. That is, the plunger biasing member 60 is located outside the storage space 40a and is disposed so as not to come into contact with the liquid flowing inside the trigger-type liquid ejector 1. The plunger biasing member 60 is formed of a non-metallic soft material. The non-metallic soft material is a polymeric material, known as an elastomer. For example, rubber can be used as the elastomer. For example, nitrile rubber is suitable as the rubber. A thermoplastic elastomer may also be used as the elastomer. For example, thermoplastic polyurethane is suitable as the thermoplastic elastomer. Note that the elastomer forming the plunger biasing member 60 is not limited to the exemplified materials. However, it is desirable that the elastomer forming the plunger biasing member 60 be a material that can be recycled along with the various synthetic resin components of the trigger-type liquid ejector 1.

[0029] Figure 2 is an enlarged view showing the periphery of the plunger biasing member in the trigger-type liquid ejector of Figure 1. In Figure 2, the shape of the plunger biasing member 60 in its natural state is shown by imaginary lines. As shown in Figures 1 and 2, the plunger biasing member 60 is formed in a circular shape concentric with the storage plunger 45 when viewed from the front-to-rear direction. The plunger biasing member 60 includes an annular outer peripheral portion 61 that is inserted from the rear into the recess 42a of the stepped portion 42 of the storage cylinder 40, and a membrane-like central portion 62 that extends entirely inside the outer peripheral portion 61. The outer peripheral portion 61 is disposed in the recess 42a over the entire circumference. An insertion recess 61a that opens to the rear is formed in the outer peripheral portion 61. The insertion recess 61a extends continuously in an annular shape over the entire circumference of the outer peripheral portion 61. The shape of the central portion 62 will be described later.

[0030] The closing member 65 fixes the plunger biasing member 60 to the storage cylinder 40. The closing member 65 has a peripheral wall portion 66 and a bottom wall portion 67, and is formed in a bottomed cylindrical shape coaxial with the storage cylinder 40. The peripheral wall portion 66 is inserted from the rear into the inside of the rear cylindrical portion 43 of the storage cylinder 40. The front end opening edge of the peripheral wall portion 66 is inserted over the entire circumference into the insertion recess 61a of the plunger biasing member 60. The peripheral surface of the peripheral wall portion 66 is provided with protrusions 66a that protrude radially outward. A plurality of protrusions 66a are provided at intervals around the circumferential direction of the peripheral wall portion 66. The protrusions 66a engage with the rear cylindrical portion 43 of the storage cylinder 40 via undercut fitting so as to be immovable rearward. As a result, the peripheral wall portion 66 fixes the outer circumferential portion 61 of the plunger biasing member 60 to the storage cylinder 40. The bottom wall portion 67 is formed in an annular shape.

[0031] The blocking member 65 further includes a protrusion 68 that protrudes rearward from the bottom wall portion 67. The protrusion 68 is formed in the shape of a closed-topped cylinder coaxial with the axis O2 and opens rearward. The rear end opening edge of the protrusion 68 is connected to the inner peripheral edge of the bottom wall portion 67 along its entire circumference. The protrusion 68 is inserted into the inside of the storage plunger 45 from the rear. The protrusion 68 has a gap with the inner peripheral surface of the storage plunger 45 along its entire circumference. The front end of the protrusion 68 is located forward of the rear opening edge of the storage plunger 45. The protrusion 68 presses the center portion 62 of the plunger biasing member 60 into the inside of the storage plunger 45.

[0032] The central portion 62 of the plunger biasing member 60 extends from the outer peripheral portion 61 toward the center, straddling the rear of the rear opening edge of the storage plunger 45. The central portion 62 includes a plunger-side contact portion 62a that contacts the storage plunger 45, and a closing member-side contact portion 62b (cylinder-side contact portion) that contacts the protrusion 68 of the closing member 65. The plunger-side contact portion 62a is located at the rear end of the plunger biasing member 60. The plunger-side contact portion 62a overlaps and contacts the rear opening edge of the storage plunger 45 from behind. The closing member-side contact portion 62b is located forward of the plunger-side contact portion 62a. The closing member-side contact portion 62b overlaps and contacts the protrusion 68 from the front, and is pushed into the inside of the storage plunger 45 by the protrusion 68. The closing member-side contact portion 62b is restricted from moving backward relative to the closing member 65 and the storage cylinder 40.

[0033] The central portion 62 further includes an annular outer connection portion 62c that connects the outer peripheral portion 61 and the plunger side contact portion 62a, and an annular inner connection portion 62d (connection portion) that connects the plunger side contact portion 62a and the blocking member side contact portion 62b. The outer connection portion 62c is disposed outside the storage plunger 45. The outer connection portion 62c extends rearward and radially inward from the outer peripheral portion 61 toward the plunger side contact portion 62a. The inner connection portion 62d is disposed inside the storage plunger 45. The inner connection portion 62d extends forward and radially inward between the protrusion 68 and the storage plunger 45 from the plunger side contact portion 62a to the blocking member side contact portion 62b. The outer connection portion 62c and the inner connection portion 62d are disposed in an elongated state in which they are tensile-elastically deformed in the front-to-rear direction. Outer connecting portion 62c and inner connecting portion 62d constantly pull plunger side contact portion 62a forward due to their restoring forces. Plunger biasing member 60 constantly biases storage plunger 45 forward (to the second side) by plunger side contact portion 62a pressing the rear opening edge of storage plunger 45 forward.

[0034] In the initial state before the user operates the trigger portion 71, the plunger biasing member 60 biases the storage plunger 45 forward, so that the storage plunger 45 is located in the most forward position. The liquid is pressurized in the storage space 40a of the storage cylinder 40 until the storage plunger 45 moves rearward. When the liquid pressure in the storage space 40a reaches a predetermined value, the storage plunger 45 moves rearward against the plunger biasing member 60, opening the communication hole 41a of the storage cylinder 40. Therefore, the storage plunger 45 can pressurize the liquid in the storage cylinder 40 until it moves rearward, and opens when the liquid pressure reaches a predetermined value and the storage plunger 45 moves rearward, functioning as a pressure accumulator valve that supplies pressurized liquid to the ejection hole 4 side.

[0035] 1, the trigger mechanism 70 includes a trigger portion 71, a main cylinder 72, a main piston 73, a trigger biasing member 75, and a holding member 80. The trigger mechanism 70 is capable of causing the liquid to flow from inside the vertical supply tube portion 10 to the ejection holes 4 side by swinging the trigger portion 71 rearward.

[0036] The trigger portion 71 is arranged in front of the vertical supply tube portion 10 so as to be movable rearward while being biased forward. The trigger portion 71 is formed to extend in the vertical direction and is arranged below the injection tube portion 50. The upper end portion of the trigger portion 71 is axially supported by the nozzle member 3 so as to be swingable in the front-rear direction.

[0037] Figure 3 is an enlarged view showing the periphery of the main cylinder in the trigger-type liquid ejector of Figure 1. In Figure 3, the shape of the trigger biasing member 75 in its natural state is shown by imaginary lines. As shown in Figures 1 and 3, the main cylinder 72 is disposed behind the trigger portion 71. The main cylinder 72 includes a cylinder body 72a and a piston guide 72b. The cylinder body 72a is formed in a cylindrical shape with a bottom that opens forward. The cylinder body 72a is fitted into the cylinder tubular portion 30. The interior of the cylinder body 72a is connected to the interior of the vertical supply tubular portion 10. The front opening edge of the cylinder body 72a is located at approximately the same position in the front-to-rear direction as the front opening edge of the cylinder tubular portion 30. The piston guide 72b protrudes forward from the bottom of the cylinder body 72a. The piston guide 72b is formed in a cylindrical shape that is disposed coaxially with the cylinder body 72a.

[0038] The main piston 73 is disposed within the main cylinder 72 so as to be movable in the front-to-rear direction. The main piston 73 is formed in a cylindrical shape with an open rear end and a closed front end, and is disposed coaxially with the main cylinder 72. The main piston 73 pressurizes and depressurizes the interior of the main cylinder 72 by moving in the front-to-rear direction.

[0039] The main piston 73 has a front end 73a connected to the trigger portion 71 and a rear end 73b fitted within the main cylinder 72 so as to be slidable back and forth. The front end 73a of the main piston 73 is movable back and forth in conjunction with the swing of the trigger portion 71. The rear end 73b of the main piston 73 is disposed between the cylinder body 72a and the piston guide 72b, and is in sliding contact over its entire circumference with both the inner circumferential surface of the cylinder body 72a and the outer circumferential surface of the piston guide 72b. The rear end 73b of the main piston 73 defines a pump chamber within the main cylinder 72 from the front.

[0040] In this embodiment, the main piston 73 is formed by combining a front portion 73f and a rear portion 73r that are separate from each other. The front portion 73f and the rear portion 73r are each formed cylindrically and are integrated by fitting the front portion 73f onto the front end of the rear portion 73r. The outer peripheral surface of the rear portion 73r has a stepped surface 73s that faces forward. The stepped surface 73s is located forward of the rear end portion 73b of the main piston 73. The stepped surface 73s faces the rear opening edge of the front portion 73f with a gap provided in the front-to-rear direction.

[0041] The main piston 73 is biased forward together with the trigger portion 71 by the biasing force of the trigger biasing member 75. As the trigger portion 71 swings rearward, the main piston 73 moves rearward and is pushed into the main cylinder 72. When the trigger portion 71 is in the forward-most swing position, the main piston 73 is correspondingly located in the forward-most position.

[0042] The trigger biasing member 75 is disposed between the rear end 73b of the main piston 73 and the trigger portion 71. That is, the trigger biasing member 75 is located outside the pump chamber in the main cylinder 72 and is disposed so as not to come into contact with the liquid flowing inside the trigger-type liquid sprayer 1. The trigger biasing member 75 biases the main piston 73 forward, thereby biasing the trigger portion 71 forward via the main piston 73. The trigger biasing member 75 is formed of a non-metallic soft material. The non-metallic soft material is a polymeric material known as an elastomer. For example, rubber can be used as the elastomer. Nitrile rubber is a suitable example of rubber. A thermoplastic elastomer may also be used as the elastomer. For example, thermoplastic polyurethane is a suitable example of the thermoplastic elastomer. The elastomer forming the trigger biasing member 75 is not limited to the exemplified materials. However, it is desirable that the elastomer forming the trigger biasing member 75 be a material that can be recycled along with the synthetic resin components of the trigger-type liquid sprayer 1. For example, the trigger biasing member 75 may be made of the same material as the plunger biasing member 60. However, the trigger biasing member 75 may be made of a different material from the plunger biasing member 60.

[0043] The trigger biasing member 75 is formed in a thin plate shape with a thickness in the front-rear direction. The trigger biasing member 75 is formed in an annular shape that is coaxial with the main cylinder 72 when viewed in the front-rear direction. The trigger biasing member 75 includes an outer circumferential portion 76 held by the main cylinder 72, an inner circumferential portion 77 held by the main piston 73, and an extendable portion 78 that connects the outer circumferential portion 76 and the inner circumferential portion 77. The outer circumferential portion 76 overlaps the open end edge of the cylinder tubular portion 30 and the open end edge of the cylinder body 72a from the front. The inner circumferential portion 77 is held by the outer circumferential surface of the main cylinder 72 so as not to be displaced forward. In this embodiment, the inner circumferential portion 77 is sandwiched between the rear end edge of the front portion 73f of the main piston 73 and the stepped surface 73s of the rear portion 73r, and is fixed to the main piston 73. The inner circumferential portion 77 is located rearward of the outer circumferential portion 76. The extendable portion 78 extends radially inward and rearward from the outer circumferential portion 76. The telescopic portion 78 is in an elongated state in which it has been tensile-elastically deformed in the front-to-rear direction. The telescopic portion 78 constantly urges the main piston 73 and the trigger portion 71 forward via the inner circumferential portion 77 due to its restoring force. A through-hole 78a is formed in the telescopic portion 78, penetrating it in the front-to-rear direction. A plurality of through-holes 78a are arranged at intervals in the circumferential direction.

[0044] The retaining member 80 holds the outer peripheral portion 76 of the trigger biasing member 75 between itself and the main cylinder 72. The retaining member 80 includes a flange portion 81 and an engagement piece 82. The flange portion 81 is formed in an annular shape and is disposed coaxially with the main cylinder 72. The flange portion 81 sandwiches the outer peripheral portion 76 of the trigger biasing member 75 between the open end edge of the cylinder tubular portion 30 and the open end edge of the cylinder body 72a. The engagement piece 82 extends rearward from the inner peripheral edge of the flange portion 81 toward the inside of the main cylinder 72. A plurality of engagement pieces 82 are provided at intervals in the circumferential direction. The engagement piece 82 passes through the through-hole 78a of the trigger biasing member 75 and extends to the space behind the trigger biasing member 75. The engagement piece 82 is undercut-fitted into the inner peripheral surface of the cylinder body 72a of the main cylinder 72. This secures the retaining member 80 to the main cylinder 72.

[0045] 1, the ball valve 17 is provided in the vertical supply tube portion 10. The ball valve 17 is a check valve that blocks communication between the inside of the container body A and the inside of the main cylinder 72 through the inside of the vertical supply tube portion 10 when the inside of the main cylinder 72 is pressurized, and displaces upward when the inside of the main cylinder 72 is depressurized, thereby allowing communication between the inside of the container body A and the inside of the main cylinder 72 through the inside of the vertical supply tube portion 10.

[0046] The storage valve 19 is disposed above the ball valve 17 within the vertical supply tube section 10. The storage valve 19 is a check valve that allows the supply of liquid from the vertical supply tube section 10 to the storage cylinder 40 and also restricts the outflow of liquid from the storage cylinder 40 to the vertical supply tube section 10.

[0047] The cover body 100 is formed to cover the entire vertical supply tube portion 10 except for the lower end portion, the entire injection tube portion 50, and the entire storage cylinder 40 from at least both the left and right sides and above.

[0048] Next, a case where the trigger-type liquid ejector 1 configured as described above is used will be described. In the following explanation, the state of the trigger-type liquid sprayer 1 is assumed to be such that, by operating the trigger portion 71 multiple times, liquid is filled into each portion of the trigger-type liquid sprayer 1, and the liquid can be sucked up from the vertical supply tube portion 10.

[0049] When the trigger 71 is pulled rearward in the state shown in FIG. 1 , the main piston 73 moves rearward from its most forward position against the biasing force of the trigger biasing member 75. At this time, the main piston 73 moves rearward while extending the telescopic portion 78 of the trigger biasing member 75 in the front-to-rear direction. The trigger biasing member 75 elastically deforms in the front-to-rear direction, and its restoring force constantly biases the main piston 73 and the trigger 71 forward. When the main piston 73 moves rearward from its most forward position in conjunction with the rearward movement of the trigger 71, pressure is applied inside the main cylinder 72. This allows the liquid in the main cylinder 72 to be supplied into the vertical supply tube 10. The liquid supplied into the vertical supply tube 10 then pressurizes the ball valve 17, closing it, and pushes the reservoir valve 19 upward, opening it.

[0050] As a result, liquid is supplied from the vertical supply tube portion 10 into the storage cylinder 40 via the connecting tube portion 20, and the inside of the storage cylinder 40 is pressurized. As the inside of the storage cylinder 40 is pressurized, the storage plunger 45 moves rearward from the most forward position against the biasing force of the plunger biasing member 60. At this time, the storage plunger 45 moves rearward while extending the outer connecting portion 62c and the inner connecting portion 62d of the plunger biasing member 60 in the front-to-rear direction. The plunger biasing member 60 undergoes tensile elastic deformation in the front-to-rear direction, and biases the storage plunger 45 forward due to its restoring force. The storage plunger 45 receives the restoring force of the plunger biasing member 60 and further pressurizes the liquid in the storage space 40a.

[0051] The rearward movement of storage plunger 45 opens communication hole 41a of storage cylinder 40. Therefore, the pressurized liquid can be guided to ejection hole 4 through communication hole 41a and injection tube portion 50, and the liquid can be ejected forward from ejection hole 4.

[0052] In this way, each time the trigger portion 71 is pulled rearward, liquid can be ejected from the ejection hole 4, and the storage plunger 45 can be moved rearward to store (fill) the liquid in the storage cylinder 40.

[0053] Thereafter, when the trigger portion 71 is released by stopping the pulling operation, the main piston 73 moves forward within the main cylinder 72 due to the biasing force of the trigger biasing member 75, and the trigger portion 71 is biased forward and returned to its original position. As a result, the pressure within the main cylinder 72 can be reduced to a negative pressure lower than the pressure within the container body A, allowing the liquid within the container body A to be sucked up into the vertical supply tube portion 10. The newly sucked up liquid then pushes up and opens the ball valve 17, and is introduced into the main cylinder 72. This prepares for the next ejection.

[0054] When the operation of the trigger portion 71 is stopped, the supply of liquid into the storage cylinder 40 through the vertical supply tube portion 10 and the connecting tube portion 20 stops, but the storage plunger 45 begins to move forward toward the most forward position due to the restoring force of the plunger biasing member 60. At this time, the outflow of liquid from the storage cylinder 40 into the vertical supply tube portion 10 is restricted by the storage valve 19.

[0055] This allows the liquid stored in the storage cylinder 40 to be guided to the ejection hole 4 through the communication hole 41a and the inside of the injection tube portion 50, and the liquid can be continuously ejected forward through the ejection hole 4. In this way, the liquid can be ejected not only when the trigger portion 71 is pulled rearward, but also when the trigger portion 71 is not operated, and thus the liquid can be continuously ejected.

[0056] As described above, the trigger-type liquid ejector 1 of this embodiment includes the plunger biasing member 60 that biases the storage plunger 45 forward and the trigger biasing member 75 that biases the trigger portion 71 forward. The plunger biasing member 60 and the trigger biasing member 75 are formed of a non-metallic soft material. With this configuration, the biasing members 60 and 75 are not formed of a non-metallic material, which reduces the environmental impact and simplifies disposal by users. Furthermore, for example, a trigger-type liquid ejector 1 can be realized in which all components are formed from a recyclable material such as synthetic resin. As a result, there is no need to separate the biasing members 60 and 75 from other components when disposing of the trigger-type liquid ejector 1. This simplifies disposal by users.

[0057] Furthermore, the plunger biasing member 60 is disposed behind the storage plunger 45. The trigger biasing member 75 is disposed between the rear end portion 73b of the main piston 73 and the trigger portion 71. With this configuration, the plunger biasing member 60 and the trigger biasing member 75 do not come into contact with the liquid flowing through the trigger-type liquid sprayer 1, thereby preventing the odor of the plunger biasing member 60 and the trigger biasing member 75 from being transferred to the liquid.

[0058] The plunger biasing member 60 also includes a plunger-side contact portion 62a that contacts the rear opening edge of the storage plunger 45, a closing member-side contact portion 62b that is pressed into the inside of the storage plunger 45 and is restricted from moving rearward relative to the storage cylinder 40, and an inner connecting portion 62d that connects the plunger-side contact portion 62a and the closing member-side contact portion 62b and is positioned inside the storage plunger 45 in an extended state. With this configuration, the inner connecting portion 62d functions as an expandable portion that generates the biasing force of the plunger biasing member 60. Because this expandable portion is pressed into the inside of the storage plunger 45, it is possible to avoid the expandable portion of the plunger biasing member 60 being positioned rearward of the storage plunger 45. This reduces the installation space for the plunger biasing member 60 in the front-to-rear direction, thereby enabling the trigger-type liquid ejector 1 to be made more compact.

[0059] The present invention is not limited to the above-described embodiment explained with reference to the drawings, and various modifications are possible within the technical scope of the present invention. For example, in the above embodiment, the plunger biasing member 60 and the trigger biasing member 75 are configured to generate a biasing force by tensile elastic deformation, but this configuration is not limited thereto. That is, at least one of the plunger biasing member and the trigger biasing member may be configured to generate a biasing force by compressive elastic deformation. However, since the biasing member is made of an elastomer, forming the biasing member to generate a biasing force by tensile elastic deformation allows the biasing member to be formed into a simple shape.

[0060] In addition, the components in the above-described embodiments can be replaced with well-known components as appropriate, without departing from the spirit of the present invention. [Explanation of symbols]

[0061] DESCRIPTION OF SYMBOLS 1...Trigger-type liquid ejector 2...Ejector body 3...Nozzle member 4...Ejection hole 10...Vertical supply tube portion 40...Storage cylinder 45...Storage plunger 60...Plunger biasing member 62a...Plunger side contact portion 62b...Closing member side contact portion (cylinder side contact portion) 62d...Inner connection portion (connection portion) 70...Trigger mechanism 71...Trigger portion 72...Main cylinder 73...Main piston 73a...Front end portion 73b...Rear end portion 75...Trigger biasing member A...Container body

Claims

1. an ejector body attached to a container containing a liquid; a nozzle member attached to the ejector body and having ejection holes formed therein for ejecting the liquid; Equipped with The ejector body includes: a vertical supply tube portion that sucks up the liquid in the container body; a trigger mechanism including a trigger portion disposed in front of the vertical supply tube portion and movable rearward in a forward biased state, the trigger portion moving rearward to cause the liquid to flow from inside the vertical supply tube portion to the ejection hole side; a storage cylinder into which the liquid that has passed through the vertical supply tube portion is supplied by rearward movement of the trigger portion; a storage plunger disposed in the storage cylinder so as to be movable in an axial direction along a central axis of the storage cylinder, and which moves to a first side in the axial direction as liquid is supplied into the storage cylinder; a plunger biasing member that biases the storage plunger toward the second axial direction; Equipped with The trigger mechanism comprises: a main cylinder disposed rearward of the trigger portion and extending in the front-rear direction; a main piston connected to the trigger portion and fitted in the main cylinder so as to be slidable back and forth; a trigger biasing member that biases the trigger portion forward; Equipped with The plunger biasing member and the trigger biasing member are formed of a non-metallic soft material. Trigger-type liquid squirt.

2. the plunger biasing member is disposed on the first side of the reservoir plunger; the main piston has a front end connected to the trigger portion and a rear end fitted within the main cylinder so as to be slidable back and forth; The trigger biasing member is disposed between the rear end of the main piston and the trigger portion. The trigger-type liquid ejector according to claim 1 .

3. The storage plunger is formed in a cylindrical shape that is open to the first side, The plunger biasing member a plunger-side contact portion that contacts the opening edge of the first side of the storage plunger; a cylinder side contact portion that is pressed into the inside of the storage plunger and is restricted in movement toward the first side relative to the storage cylinder; a connecting portion that connects the plunger-side contact portion and the cylinder-side contact portion and is disposed inside the storage plunger in an extended state; Equipped with 3. The trigger-type liquid ejector according to claim 1 or 2.

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