Trigger-type liquid ejector

Abstract

To surely activate a valve body, passed through a vertical supply tube part, which switches between communication between the inside of a container body and the inside of a cylinder and blocking of the communication.SOLUTION: A trigger-type liquid sprayer comprises a valve body 10, passed through a vertical supply tube part 13, which switches between communication between the inside of a container body A and the inside of a cylinder 17 and blocking of the communication, in which a first hole 25 through which liquid in the cylinder is flown into the vertical supply tube part when a piston 16 moves rearward and a second hole 26 through which liquid in the container body is flown into the cylinder through the vertical supply tube part when the piston moves forward and which is opened and closed by the valve body are formed. The valve body is provided to be movable back and forth, which moves rearward in liaison with the piston moving rearward, so as to block the second hole.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Conventionally, as shown in Patent Document 1 below, for example, there has been known a trigger-type liquid ejector which has a vertical supply tube section which extends in the vertical direction and sucks up liquid within a container body, and a trigger section which is arranged in front of the vertical supply tube section and can move backward in a forward biased state, and which causes liquid to flow from within the vertical supply tube section towards the ejection hole side by moving the trigger section backward, wherein the trigger mechanism has a valve body which blocks communication between the inside of the container body and the inside of the cylinder when the piston moves backward, and which opens communication between the inside of the container body and the inside of the cylinder when the piston moves forward, and the valve body is arranged on a valve seat in the vertical supply tube section so that it can be moved upwardly away from the valve seat. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-50423 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional trigger-type liquid ejector described above, depending on the properties of the liquid, for example, the valve body may adhere to the valve seat, and when the piston moves back toward the front, the valve body may remain in contact with the valve seat and not operate, resulting in no communication between the inside of the container and the inside of the cylinder.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide a trigger-type liquid ejector that can reliably operate a valve body that switches between communication between the inside of the container and the inside of the cylinder through the vertical supply tube portion and the blocking of communication therebetween. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention proposes the following means. The ejector body is equipped with a liquid-containing container body, and a nozzle member that is attached to a front end of the ejector body and has an ejection hole for ejecting liquid forward. The ejector body extends in the vertical direction and has a vertical supply tube portion that sucks up liquid in the container body, and a trigger portion that is provided in front of the vertical supply tube portion and can move rearward in a forward biased state, and a trigger mechanism that causes liquid to flow from inside the vertical supply tube portion toward the ejection hole side by the rearward movement of the trigger portion. The trigger mechanism has a piston that moves back and forth in conjunction with the forward and backward movement of the trigger portion, The ejector body is provided with a cylinder into which the piston is inserted, and a valve body which switches between communication between the inside of the container body and the inside of the cylinder through the vertical supply tube portion and between communication and blocking of the communication. The ejector body is formed with a first hole which allows the liquid in the cylinder to flow into the vertical supply tube portion when the piston moves backward, and a second hole which allows the liquid in the container body to flow into the cylinder through the vertical supply tube portion when the piston moves forward and is opened and closed by the valve body. The valve body is provided so as to be movable back and forth, and moves backward in conjunction with the piston moving backward to close the second hole. The valve body is attached to the piston so as to be slidable back and forth. .

[0007] According to the present invention, the valve body is provided so as to be movable back and forth, and moves back in conjunction with the rearward moving piston to close the second hole, so that even if the valve body becomes difficult to move back and forth, for example, by being left for a while, the valve body is forcibly moved back by linking with the rearward movement of the piston, and the valve body can be reliably operated to block communication between the inside of the container body and the inside of the cylinder through the inside of the vertical supply tube part. Then, as the piston moves back toward the front, the valve body is moved forward to open the second hole, and the liquid in the container body flows into the cylinder through the second hole.

[0008] The second hole may connect the inside of the cylinder and the inside of the vertical supply tube portion in the front-rear direction, and at least a front end portion of the second hole on the cylinder side may have a diameter that narrows toward the rear, and a curved portion that protrudes toward the rear may be formed at the rear end of the valve body, and when the piston moves rearward, the curved portion may abut against an inner circumferential surface of the front end portion of the second hole.

[0009] In this case, at least the front end of the second hole on the cylinder side narrows in diameter as it moves rearward, and a curved portion protruding rearward is formed at the rear end of the valve body. Therefore, even if a force is applied to the valve body in a direction that intersects the front-to-rear direction as the piston moves rearward, the curved portion of the valve body can be abutted against the inner surface of the front end of the second hole, thereby reliably blocking communication between the inside of the cylinder and the inside of the vertical supply tube portion through the second hole.

[0011] valve Since the body is attached to the piston so as to be slidable back and forth, the valve body can be made to reliably follow the back and forth movement of the piston.

[0012] The valve body and the piston may abut against each other so as to be slidable in the front-rear direction while being spaced apart from each other around a central axis of the cylinder extending in the front-rear direction.

[0013] In this case, the valve body and the piston abut against each other while being spaced apart around the central axis of the cylinder extending in the fore-and-aft direction and are capable of sliding in the fore-and-aft direction. This makes it possible to prevent an enclosed space from being created between the valve body and the piston, thereby suppressing, for example, an increase in the pulling force toward the rear of the trigger portion and an insufficient amount of movement of the piston toward the rear. Effect of the Invention

[0014] According to the present invention, the valve body that switches between communication and cut-off between the inside of the container body and the inside of the cylinder through the vertical supply tube portion can be reliably operated. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a vertical cross-sectional view of a trigger type liquid ejector shown as a first embodiment. [Diagram 2] FIG. 2 is an enlarged view showing a part II in FIG. [Diagram 3] FIG. 11 is a vertical cross-sectional view of a trigger type liquid ejector shown as a second embodiment. [Figure 4] FIG. 4 is an enlarged view showing a portion IV in FIG. [Diagram 5] FIG. 11 is a vertical cross-sectional view of a trigger type liquid ejector shown as a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] A first embodiment of a trigger type liquid ejector will be described below with reference to Figures 1 and 2. The trigger type liquid ejector 1 of this embodiment comprises an ejector body 11 that is attached to a container body A that contains liquid, and a nozzle member 12 that is attached to the ejector body 11. Unless otherwise specified, each component part of the trigger type liquid ejector 1 is a molded product made of synthetic resin.

[0017] The ejector body 11 has a vertical supply tube portion 13 and a trigger mechanism T. Hereinafter, the direction along the central axis O1 of the vertical supply tube portion 13 is referred to as the vertical direction, and the bottom side of the container body A along the vertical direction is referred to as the lower side, and the opposite side is referred to as the upper side. When viewed from the vertical direction, the side where the nozzle member 12 is located with respect to the vertical supply tube portion 13 is referred to as the front side, and the opposite side is referred to as the rear side. When viewed from the vertical direction, the direction perpendicular to the front-rear direction is referred to as the left-right direction.

[0018] The nozzle member 12 is attached to the front end of the ejector body 11 and has an ejection hole 15 for ejecting liquid forward.

[0019] The vertical supply tube portion 13 is inserted into the mouth portion A1 and sucks up the liquid in the container body A. The trigger mechanism T includes a trigger portion 14, a piston 16, a cylinder 17, and a first valve body (valve body) 10. The trigger mechanism T causes the liquid to flow from inside the vertical supply tube portion 13 toward the nozzle hole 15 side by the rearward movement of the trigger portion 14.

[0020] The trigger portion 14 is provided in front of the vertical supply cylinder portion 13 so as to be movable rearward while being biased forward. The trigger portion 14 extends in the vertical direction and is supported so as to be rotatable in the front-rear direction around its upper end portion. The piston 16 moves back and forth in coordination with the back and forth movement of the trigger portion 14. The piston 16 is formed in a cylindrical shape with the front closed by a front end wall 16a and the rear open. The front end wall 16a of the piston 16 is connected to the trigger portion 14. The cylinder 17 is formed in a cylindrical shape extending in the front-rear direction, and the piston 16 is slidably fitted inside the cylinder 17. The first valve body 10 switches between communication and blocking between the inside of the container body A and the inside of the cylinder 17 through the inside of the vertical supply tube portion 13. The first valve body 10 is provided in the cylinder 17.

[0021] An injection tube portion 20 is provided in front of the vertical supply tube portion 13 . The injection tube portion 20 allows the liquid in the vertical supply tube portion 13 to flow toward the ejection hole 15. The injection tube portion 20 extends forward from the upper end portion of the vertical supply tube portion 13. The inside of the injection tube portion 20 is connected to the inside of the vertical supply tube portion 13.

[0022] A second valve body 23 is provided inside the vertical supply tube portion 13. The second valve body 23 communicates between the inside of the cylinder 17 and the inside of the injection tube section 20 when the internal pressure of the cylinder 17 increases due to the rearward movement of the trigger section 14, and blocks communication between the inside of the cylinder 17 and the inside of the injection tube section 20 when the internal pressure of the cylinder 17 becomes negative due to the forward return movement of the trigger section 14. The second valve body 23 is provided in the upper end section of the vertical supply tube section 13.

[0023] Relay member 18 is attached to injection tube portion 20 from the front. The relay member 18 includes a partition 19 that covers the front end opening of the injection tube portion 20 from the front, an outer fitting tube portion 21 that extends rearward from the partition 19 and is fitted onto the injection tube portion 20, and an attachment tube portion 22 that extends forward from the partition 19 and has the nozzle member 12 attached thereto. A communication hole 24 that communicates with the inside of the injection tube 20 is formed in the partition wall 19 at a portion located inside the mounting tube 22 .

[0024] In this embodiment, the ejector body 11 is formed with a first hole 25 which allows the liquid in the cylinder 17 to flow into the vertical supply tube portion 13 when the piston 16 moves backward, and a second hole 26 which allows the liquid in the container body A to flow into the cylinder 17 through the vertical supply tube portion 13 when the piston 16 moves forward, and is opened and closed by the first valve body 10.

[0025] The first hole 25 and the second hole 26 communicate the inside of the cylinder 17 with the inside of the vertical supply tube section 13 in the front-rear direction. The first hole 25 is located above the second hole 26. The first hole 25 opens to a portion of the vertical supply tube section 13 that is located below the valve seat 13a on which the second valve body 23 is seated so as to be able to separate upward. The second hole 26 is disposed coaxially with the cylinder 17. At least the front end of the second hole 26 on the cylinder 17 side is tapered in diameter toward the rear of the vertical supply tube section 13. A partition wall 13b is formed on the inner surface of the vertical supply tube portion 13, blocking communication in the vertical direction between the portion of the vertical supply tube portion 13 where the first hole 25 is open and the portion of the vertical supply tube portion 13 where the second hole 26 is open.

[0026] Here, the first valve body 10 is provided so as to be movable forward and backward, and moves backward in conjunction with the piston 16 moving backward to close the second hole 26. The first valve body 10 is inserted inside the piston 16. The first valve body 10 is formed in a cylindrical shape extending in the forward and backward directions, and is disposed coaxially with the cylinder 17. The rear part of the first valve body 10 protrudes rearward from the piston 16.

[0027] The first valve body 10 is inserted into a guide tube 29 that protrudes forward from a bottom surface that faces forward and is located at the rear end of the inner surface of the cylinder 17. The front part of the guide tube 29 is inserted into the piston 16. The guide tube 29 prevents the first valve body 10 from tilting in the front-rear direction.

[0028] The first valve body 10 and the guide tube 29 are provided with a restricting portion 28 that restricts further forward movement of the first valve body 10. The restricting portion 28 is composed of a protrusion provided at the rear end of the outer circumferential surface of the first valve body 10, and a locking surface formed on the guide tube 29 and abutting against the protrusion of the first valve body 10 from the front of the protrusion. As shown in Fig. 1, when the piston 16 is waiting before moving backward, the protrusion and the locking surface of the restricting portion 28 abut against each other in the front-rear direction.

[0029] A curved surface portion 10a protruding rearward is formed at the rear end portion of the first valve body 10, and when the piston 16 moves rearward, the curved surface portion 10a abuts against the inner peripheral surface of the front end portion of the second hole 26. The curved surface portion 10a is a part of a spherical surface. During the above-mentioned standby state, the rear end portion of the first valve body 10 is inserted into the front end portion of the second hole 26 with the second hole 26 open. Note that during this standby state, the rear end portion of the first valve body 10 may be located forward of the second hole 26.

[0030] The first valve body 10 is attached to the piston 16 so as to be slidable in the front-rear direction. The first valve body 10 and the piston 16 abut against each other so as to be slidable in the front-rear direction with a gap therebetween about a central axis (hereinafter referred to as the horizontal axis) O2 of the cylinder 17 extending in the front-rear direction.

[0031] In the illustrated example, the piston 16 is formed with a sliding body 27 that extends rearward from the front end wall 16a to which the trigger portion 14 is connected and is inserted into the first valve body 10. The sliding body 27 is formed in a rod shape and disposed coaxially with the horizontal axis O2. A sliding protrusion 27a is formed on the outer circumferential surface of the sliding body 27, which abuts against the inner circumferential surface of the first valve body 10 so as to be slidable in the front-rear direction. A plurality of the sliding protrusions 27a are provided at intervals around the horizontal axis O2. The first valve body 10 and the piston 16 abut against each other at a plurality of points spaced apart around the horizontal axis O2 so as to be slidable in the front-rear direction. The sliding projection 27a may be provided at only one location so that a gap is provided between the sliding projection 27a and the inner circumferential surface of the first valve body 10 in a portion of the direction along the horizontal axis O2. For example, one sliding projection 27a may be provided and extend around the horizontal axis O2 so as to have a C-shape when viewed from the front-rear direction.

[0032] Next, the operation of the trigger type liquid ejector 1 configured as above will be described. It is assumed that liquid is filled into each part of the ejector body 11 by operating the trigger portion 14 multiple times.

[0033] When the trigger portion 14 is pulled backward against the forward biasing force, the piston 16 moves backward as the trigger portion 14 moves backward, and the liquid in the cylinder 17 flows into the vertical supply tube portion 13 through the first hole 25. The liquid that has flowed into the vertical supply tube portion 13 pushes the second valve body 23 up from the valve seat 13a to open the valve, and the liquid is supplied in a pressurized state into the injection tube portion 20. The liquid supplied into the injection tube portion 20 is ejected from the ejection hole 15 through the communication hole 24 and the mounting tube portion 22.

[0034] When the piston 16 moves rearward, the sliding projection 27a slides rearward on the inner peripheral surface of the first valve body 10, causing the first valve body 10 to move rearward, and the curved surface portion 10a of the first valve body 10 abuts against the inner peripheral surface of the front end portion of the second hole 26, blocking communication between the inside of the cylinder 17 and the inside of the vertical supply tube portion 13 through the second hole 26. At this time, since the sliding projections 27a are provided at intervals around the horizontal axis O2, the inside of the first valve body 10 is not sealed, and communicates with the inside of the cylinder 17 through the inside of the piston 16.

[0035] When the trigger portion 14 is released after the liquid is ejected, the trigger portion 14 is urged forward and returns to its original position, and the piston 16 moves forward accordingly. Therefore, the sliding protrusion 27a slides forward on the inner peripheral surface of the first valve body 10, which moves the first valve body 10 forward, and the curved surface portion 10a of the first valve body 10 moves forward away from the inner peripheral surface of the front end of the second hole 26, which opens the second hole 26. The liquid in the container body A flows into the cylinder 17 through the vertical supply tube portion 13 and the second hole 26 due to the negative pressure generated in the cylinder 17. At this time, the second valve body 23 is kept in a closed state due to the negative pressure in the cylinder 17.

[0036] It should be noted that the piston 16 does not need to slide on the first valve body 10 when the piston 16 moves forward to return to its original position. In this case, the negative pressure generated in the cylinder 17 can cause the liquid in the container body A to reach the second hole 26 through the vertical supply tube portion 13, and the flow of the liquid at this time can move the first valve body 10 forward, completely opening the second hole 26.

[0037] As described above, according to the trigger-type liquid sprayer 1 of this embodiment, the first valve body 10 is arranged to be movable back and forth, and moves backward in conjunction with the rearward moving piston 16 to block the second hole 26. Therefore, even if the first valve body 10 becomes difficult to move back and forth, for example by being left alone for a while, the first valve body 10 will be forced to move backward in conjunction with the rearward movement of the piston 16, and the first valve body 10 will be reliably operated to block communication between the inside of the container body A and the inside of the cylinder 17 through the vertical supply tube portion 13.

[0038] At least the front end of the second hole 26 on the cylinder 17 side narrows in diameter as it moves rearward, and a curved portion 10a protruding rearward is formed at the rear end of the first valve body 10. Therefore, even if a force is applied to the first valve body 10 in a direction that intersects the front-to-rear direction as the piston 16 moves rearward, the curved portion 10a of the first valve body 10 can be abutted against the inner surface of the front end of the second hole 26, thereby reliably blocking communication between the inside of the cylinder 17 and the inside of the vertical supply tube portion 13 through the second hole 26. Since the rear end of the first valve body 10 is formed into a hemispherical shape that bulges toward the rear, communication between the inside of the cylinder 17 and the inside of the vertical supply tube portion 13 through the second hole 26 can be blocked more reliably.

[0039] Since the first valve body 10 is attached to the piston 16 so as to be slidable back and forth, the first valve body 10 can be made to reliably follow the back and forth movement of the piston 16.

[0040] Since the first valve body 10 and the piston 16 abut against each other while being spaced apart about the horizontal axis O2 and slidably movable in the front-to-rear direction, it is possible to prevent an enclosed space from being generated between the first valve body 10 and the piston 16, and it is possible to suppress, for example, an increase in the pulling force toward the rear of the trigger portion 14 and an insufficient amount of movement of the piston 16 toward the rear.

[0041] Next, a trigger type liquid ejector 2 according to a second embodiment will be described with reference to FIGS. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and their description will be omitted, with only the differences being described.

[0042] In this embodiment, the piston 16 is provided with a slide body 31 instead of the slide body 27. The slide body 31 is formed on the inner circumferential surface of the piston 16, extends rearward from a front end wall 16a of the piston 16, and is inserted into a slit 29a (described later) of the guide tube 29 so as to be movable rearward. The slide body 31 is formed in a plate shape with the front and back surfaces facing about the horizontal axis O2. A plurality of slide bodies 31 are provided at intervals around the horizontal axis O2. Note that one slide body 31 may be provided and extends around the horizontal axis O2 so as to have a C-shape when viewed from the front-rear direction. The guide tube 29 has a plurality of slits 29a formed at intervals around the horizontal axis O2, the slits 29a extending rearward from the front end opening edge of the guide tube 29. The sliding body 31 abuts against the outer circumferential surface of the first valve body 10 through the slits 29a. In the illustrated example, a protrusion 10b extending around the horizontal axis O2 is formed on the outer circumferential surface of the first valve body 10, and this protrusion 10b abuts against the slide body 31.

[0043] As described above, in this embodiment as well, similarly to the trigger-type liquid jetting device 1 of the first embodiment, the first valve body 10 and the piston 16 abut against each other while being spaced apart around the horizontal axis O2 and able to slide in the forward and backward directions, thereby providing the same functional effects as the trigger-type liquid jetting device 1 of the first embodiment.

[0044] Next, a trigger type liquid ejector 3 according to a third embodiment will be described with reference to FIG. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and their description will be omitted, with only the differences being described.

[0045] In this embodiment, a slide body 32 is formed in the piston 16 instead of the slide body 27 . The slide body 32 protrudes rearward from the inner peripheral surface of the piston 16, and extends rearward toward the outer peripheral surface of the first valve body 10. The rear end of the slide body 32 abuts against the outer peripheral surface of the first valve body 10. A plurality of slide bodies 32 are provided at intervals around the horizontal axis O2. Note that one slide body 32 may be provided and extends around the horizontal axis O2 so as to have a C-shape when viewed from the front-rear direction. The guide tube 29 is located rearward of the piston 16. The guide tube 29 enters inside the piston 16 when the piston 16 is at the retracted end position.

[0046] As described above, in this embodiment as well, similarly to the trigger-type liquid jetting device 1 of the first embodiment, the first valve body 10 and the piston 16 abut against each other while being spaced apart around the horizontal axis O2 and able to slide in the forward and backward directions, thereby providing the same functional effects as the trigger-type liquid jetting device 1 of the first embodiment.

[0047] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0048] For example, the first valve body 10 does not need to be formed with the curved surface portion 10a. The first valve body 10 and the piston 16 may abut against each other over their entire length about the horizontal axis O2. The first valve body 10 and the piston 16 may be in contact with each other so as to be slidable in the front-rear direction continuously over the entire length around the horizontal axis O2. In this case, for example, the forward biasing force of the trigger portion 14 may be designed in consideration of the internal pressure of the sealed space defined between the first valve body 10 and the piston 16.

[0049] The second valve body 23 does not need to be provided. A configuration may be adopted in which the valve seat on which the second valve body is releasably seated faces rearward, and the second valve body is releasably seated on this valve seat facing rearward. In this configuration, the second valve body may face the first hole 25 in the front-rear direction.

[0050] In addition, within the scope of the spirit of the present invention, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described embodiments and variations may be combined as appropriate. [Explanation of symbols]

[0051] 1, 2, 3 Trigger Liquid Squirter 10 First valve body (valve body) 10a Curved section 11 Squirt body 12 Nozzle member 13 Vertical supply tube 14 Trigger section 15 Spout hole 16 Piston 17 Cylinder 25 Hole 1 26 2nd hole A Container body A1 Mouth O2 Horizontal axis (center axis) T Trigger Mechanism

Claims

1. An ejector body that is attached to a container that contains a liquid; a nozzle member attached to a front end of the ejector body and having an ejection hole for ejecting liquid forward; The ejector body includes: A vertical supply tube portion that extends in a vertical direction and sucks up the liquid in the container body; a trigger mechanism including a trigger portion provided in front of the vertical supply tube portion and movable rearward in a forward biased state, the trigger portion moving rearward to cause liquid to flow from inside the vertical supply tube portion toward the nozzle hole side, The trigger mechanism includes: A piston that moves back and forth in coordination with the back and forth movement of the trigger portion; a cylinder into which the piston is inserted; a valve body for switching communication between the inside of the container body and the inside of the cylinder through the vertical supply tube portion and blocking the communication, The ejector body includes: a first hole that allows the liquid in the cylinder to flow into the vertical supply tube portion when the piston moves rearward; a second hole that allows the liquid in the container body to flow into the cylinder through the vertical supply tube portion when the piston moves forward, and that is opened and closed by the valve body; the valve body is provided to be movable forward and backward, and moves backward in conjunction with the piston moving backward to close the second hole, The valve body is attached to the piston so as to be slidable back and forth.

2. The second hole communicates the inside of the cylinder with the inside of the vertical supply tube portion in the front-rear direction, At least a front end portion of the second hole on the cylinder side is tapered toward the rear, 2. The trigger-type liquid ejector according to claim 1, wherein a curved surface portion protruding rearward is formed at the rear end of the valve body, and when the piston moves rearward, the curved surface portion abuts against the inner circumferential surface of the front end of the second hole.

3. 3. The trigger type liquid ejector according to claim 1, wherein the valve body and the piston abut against each other so as to be slidable in the front-rear direction while being spaced apart from each other around a central axis of the cylinder extending in the front-rear direction.

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