JP2016087526A - Trigger type liquid ejector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a trigger type liquid ejector that can eject liquid continuously regardless of whether a trigger portion is pulled or not.SOLUTION: In a connection body 60 that communicates an ejector main body 11 with a nozzle 12 are formed a first communication hole 62 that opens toward a front end opening 14a of an injection tube portion 14, a first introduction path 68 that introduces liquid from the first communication hole 62 to an injection hole 12c of the nozzle 12 and has a smaller flow passage-cross section area than the first communication hole 62, and a passage space 61 that communicates the first communication hole 62 with the first introduction path 68. At a front end part of a storing cylinder 60e that stores an auxiliary piston 64 being biased forward is formed a second communication hole 63 that communicates the inside of the storing cylinder 60e with the passage space 61.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a trigger type liquid ejector.

  2. Description of the Related Art Conventionally, there has been known a trigger type liquid ejector that sucks liquid from a container body and discharges it from a nozzle by operating a trigger portion extending below the nozzle (for example, Patent Document 1 below). This is because the injection cylinder part extends in front of the upper part of the suction cylinder part communicating with the container body, a nozzle is attached to the tip side of the injection cylinder part, and it operates by operating the trigger part below the injection cylinder part. A cylinder is disposed, and the liquid is sucked into the cylinder from the suction cylinder part by operating the trigger part, and this liquid is ejected forward from the injection cylinder part through the nozzle.

Japanese Patent No. 3789904

  In the conventional trigger type liquid ejector, liquid is ejected only when the trigger portion is pulled. However, for example, when liquid is sprayed over a large area, the operation of pulling the trigger portion must be repeated many times, which is troublesome.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a trigger type liquid ejector that enables continuous liquid ejection not only when the trigger portion is pulled.

In order to achieve the above object, the present invention provides the following means.
(1) The trigger type liquid ejector according to the present invention includes an ejector body, and a nozzle provided at a front end of the ejector body and having an ejection hole formed therein, and the ejector body is arranged in a vertical direction. An extending suction cylinder part, an injection cylinder part extending forward from the suction cylinder part, extending downward from the injection cylinder part, and swinging backward in a forward biased state A trigger portion that is freely arranged, and when the trigger portion is swung rearward, each inside of the suction tube portion and the injection tube portion, and the front of the injection tube portion A trigger type liquid ejector that ejects liquid through an ejection hole of the nozzle provided on the nozzle, comprising a coupling body that communicates the ejector body and the nozzle, and the coupling body is housed in a front-rear direction. A cylinder and a self-moving backward in a forward biased state in the receiving cylinder. An auxiliary piston disposed in the nozzle, and the connecting body includes a first series of holes that open toward a front end opening of the injection cylinder portion, and liquid from the first series of holes is supplied to the nozzle. A first introduction path that leads to the ejection hole and has a smaller channel cross-sectional area than the first series of through holes, and a passage space that communicates the first series of through holes and the first introduction path, are formed, A second communication hole that communicates the inside of the storage cylinder and the passage space is formed at the front end of the storage cylinder.

According to the trigger type liquid ejector according to the present invention, the trigger type liquid ejector is attached to the container body containing the liquid to be ejected, and the trigger is moved backward in a state where the liquid can be sucked up from the suction cylinder portion. When pulled, the internal pressure of the injection cylinder rises, so that liquid is ejected forward of the nozzle through the suction cylinder and the injection cylinder. At this time, since the flow passage area of the first introduction passage is smaller than the passage area of the first passage hole, a part of the liquid introduced from the first passage hole into the passage space passes through the first introduction passage. It cannot pass through and is introduced into the receiving cylinder through the second communication hole. When the liquid is introduced into the storage cylinder, the auxiliary piston moves backward against the urging force.
After that, when the internal pressure of the injection cylinder part decreases and the liquid supply from the injection cylinder part to the passage space stops, the liquid introduced into the storage cylinder moves forward by the urging force of the auxiliary piston, so that the second communication It is ejected from the nozzle through the hole and the passage space. That is, not only when the trigger part is pulled backward to increase the internal pressure of the injection cylinder part, but also when the internal pressure of the injection cylinder part decreases, the liquid will be ejected from the nozzle, allowing continuous liquid injection It becomes.
If the trigger portion is not pulled again when the auxiliary piston moves forward, the auxiliary piston moves forward to the most advanced position, but the operation of pulling the trigger portion before that can be repeated. In this case, the auxiliary piston repeatedly moves backward and forward with a substantially constant width, and gradually moves backward as a whole. Thereby, the liquid gradually accumulates in the storage cylinder. Then, by moving the auxiliary piston to the last retracted position, the liquid can be continuously ejected for a long time until the auxiliary piston moves from the last retracted position to the most advanced position.

In the present invention, the connecting body is mounted with a second mounting portion mounted on the first mounting portion formed at the front end portion of the injection cylinder portion and a third mounting portion formed at the rear end portion of the nozzle. A fourth mounting portion, and the third mounting portion of the nozzle may be configured to be mountable on the first mounting portion of the injection tube portion.
In this case, the trigger type liquid ejector having the existing configuration without the storage cylinder and the trigger type liquid ejector having the storage cylinder provided to enable continuous injection can be easily switched depending on the presence or absence of the coupling body. Can do. Further, the second mounting portion and the fourth mounting portion can have the same form, and the cost of the mold can be reduced.

In the present invention, the storage cylinder may be configured to extend in parallel with the injection passage portion above the injection cylinder portion.
In this case, the trigger type liquid ejector can be reduced in size in the front-rear direction and the auxiliary piston stroke can be extended to extend the continuous injection time compared to the case where the storage cylinder is formed so as to be continuous with the injection cylinder part. Can do.

  ADVANTAGE OF THE INVENTION According to this invention, the trigger type liquid ejector which enabled continuous injection of the liquid not only when pulling a trigger part can be provided.

It is a longitudinal cross-sectional view of the trigger type liquid ejector which concerns on 1st embodiment of this invention. It is explanatory drawing of the state which pulled the trigger part with respect to FIG. It is a longitudinal cross-sectional view of the trigger type liquid ejector which concerns on 2nd embodiment of this invention.

<First embodiment>
Hereinafter, a trigger type liquid ejector according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the trigger type liquid ejector 10 includes a suction tube portion 13 that extends in the vertical direction, and an injection tube portion 14 that extends forward from the upper front surface of the suction tube portion 13. , And an ejector main body 11 having a substantially L shape in a side view. The trigger type liquid ejector 10 includes a nozzle 12 at the front end of the injection cylinder portion 14. Each configuration of the trigger type liquid ejector 10 of the present embodiment is a molded product using a synthetic resin unless otherwise specified.

The suction cylinder portion 13 includes a top cylinder-shaped outer cylinder 18 and an inner cylinder 19 that is fitted into the outer cylinder 18. The outer cylinder 18 and the inner cylinder 19 form large-diameter portions 18a and 19a and small-diameter portions 18b and 19b, respectively, from the bottom to the top.
The central axes of the small diameter portions 18b and 19b of the outer cylinder 18 and the inner cylinder 19 are located on a common axis. This common axis is the axis O, and the direction along the axis O is the vertical direction. Further, along the vertical direction, the side on which the container body (not shown) is attached to the trigger type liquid ejector 10 is defined as the lower side, and the opposite side as the upper side.

  A mounting cap 20 to be mounted on the mouth of the container body is attached to each large diameter portion 18a, 19a. When the mounting cap 20 is attached to the container body, the upper portion of the pipe 21 that places the lower end opening at the bottom of the container body is fitted into the small diameter portion 19b of the inner cylinder 19. The outer cylinder 18 includes a flange portion 18c that connects the upper end of the large diameter portion 18a and the lower end of the small diameter portion 18b, and the inner cylinder 19 has a flange portion that connects the upper end of the large diameter portion 19a and the lower end of the small diameter portion 19b. 19c.

The injection cylinder part 14 connects the rear end to the upper front surface of the inner cylinder 19 of the suction cylinder part 13. A discharge hole 22 is formed in the upper front surface of the inner cylinder 19 to communicate the inner space with the inner space of the injection cylinder portion 14.
A rear extension cylinder part 25 c of the front end closing member 25 in the ejector body 11 is fitted on the front part of the injection cylinder part 14. The front end closing member 25 includes a counter plate portion 25b facing the front end opening 14a of the injection cylinder portion 14, a rear extension cylinder portion 25c extending rearward from the rear surface of the counter plate portion 25b, and a front surface of the counter plate portion 25b. It has the 1st fitting cylinder 25a extended ahead, and the center protrusion 25d extended ahead from the front surface of the opposing board part 25b in the inner peripheral side of the 1st fitting cylinder 25a. The first fitting cylinder 25a and the central protrusion 25d are provided to be biased downward with respect to the injection cylinder part 14. An injection hole 25e that communicates with the front end opening 14a of the injection cylinder portion 14 is formed in a portion of the counter plate portion 25b that is positioned above the central protrusion 25d and inside the first fitting cylinder 25a.

A second fitting cylinder 60a on the rear side of the connecting body 60, which will be described in detail later, is fitted on the first fitting cylinder 25a. Inside the first fitting cylinder 25a, a cylindrical internal space 25f having a central protrusion 25d disposed at the center is formed.
On the front side of the connecting body 60, a fourth fitting cylinder 60b for fitting the third fitting cylinder 12a inside the nozzle 12 is formed. Inside the fourth fitting cylinder 60b, a cylindrical passage space 61 having a central shaft 60d and a central cylinder 12d arranged at the center is formed. The passage space 61 communicates with the inner space 25f of the first fitting cylinder 25a at the lower rear side through the first through-hole 62, and through the concave grooves 68a and 68b of the central shaft 60d and the central cylinder 12d. The twelve ejection holes 12c communicate with the turning circuit 12e behind. Thereby, the liquid introduced into the injection cylinder part 14 from the suction cylinder part 13 is injected into the injection hole 25e, the internal space 25f of the first fitting cylinder 25a, the first series of through holes 62, the passage space 61, the central axis 60d, and It is injected forward of the nozzle 12 from the injection hole 12c through the concave grooves 68a and 68b of the central cylinder 12d and the turning circuit 12e.

  A center axis (not shown) of the injection cylinder portion 14 extends along an orthogonal plane orthogonal to the axis O. A direction along the central axis of the injection cylinder portion 14 is a front-rear direction. Further, along the front-rear direction, the side where the injection cylinder portion 14 is located with respect to the axis O is defined as the front side, and the opposite side is defined as the rear side. Furthermore, let the direction orthogonal to both the up-down direction and the front-back direction be a left-right direction.

  A discharge valve 23 that is elastically deformable in the vertical direction is disposed in the upper end portion of the inner cylinder 19 of the suction cylinder section 13. The discharge valve 23 includes a base portion 23 a that contacts the lower surface of the upper wall of the outer cylinder 18 from the upper end opening of the inner cylinder 19, and a valve seat that is disposed below the base section 23 a and is formed in a step shape in the inner cylinder 19. It has the valve body 23b which contact | abuts from 19d from upper direction, and the hollow spring part 23c which connects between the base part 23a and the valve body 23b. The valve body 23b is pressed against the hollow spring portion 23c from above and comes into liquid-tight contact with the valve seat 19d, and the communication between the space above the valve seat 19d in the inner cylinder 19 and the space below is blocked. Further, the valve body 23b rises against the urging force of the hollow spring portion 23c and is separated from the valve seat 19d, thereby communicating the space above and below the valve seat 19d.

  On the inner peripheral surface of the inner cylinder 19, a tapered cylinder portion 19 e that projects toward the lower side protrudes from a portion located below the valve seat 19 d and above the upper end of the pipe 21. A spherical suction valve 24 is disposed inside the tapered cylinder portion 19e. The suction valve 24 is detachably seated on the inner peripheral surface of the tapered cylindrical portion 19e. The suction valve 24 communicates and blocks the space between the discharge valve 23 and the suction valve 24 and the space below the suction valve 24 in the inner cylinder 19.

  In the outer cylinder 18 of the suction cylinder 13, a cylinder housing cylinder 27 that projects so as to open toward the front is integrally formed at a portion located below the injection cylinder 14. The lower part of the lower wall of the cylinder housing cylinder part 27 forms a flange part 18 c of the outer cylinder 18. A gap is formed between the flange portion 18 c of the outer cylinder 18 and the flange portion 19 c of the inner cylinder 19.

  The ejector body 11 includes a trigger portion 15 that extends downward from the injection cylinder portion 14 and can swing in the front-rear direction, a piston 16 that moves back and forth in conjunction with the front-back swing of the trigger portion 15, and a piston 16 is a cylinder 17 whose inside is pressurized and depressurized in accordance with the back and forth movement, an elastic plate portion 26 that urges the trigger portion 15 to swing forward, a suction cylinder portion 13, an injection cylinder portion 14, and a connection And a cover body 30 that covers the housing cylinder 60e of the body 60. The cover body 30 covers the suction cylinder portion 13, the injection cylinder portion 14, and the storage cylinder 60 e from the upper side, the rear side, and the left and right sides.

The cylinder 17 has a cylindrical shape that is closed at the rear end, and has an outer cylindrical portion 31 that opens forward, a piston guide portion 32 that extends forward from the center of the rear wall 17a inside the outer cylindrical portion 31, Is provided. In the rear end opening of the piston guide portion 32, a fitting projection 29 protruding from the rear end surface of the cylinder housing cylinder portion 27 is fitted.
The outer cylinder part 31 is fitted into the cylinder housing cylinder part 27. The inner circumferential surface of the cylinder housing cylinder portion 27 and the outer circumferential surface of the outer cylinder portion 31 are in airtight contact with both end portions in the front-rear direction, and a gap is provided between the front and rear contact portions. Create a space. The outer cylinder portion 31 is formed with a first vent hole 31a that communicates the internal space with the cylindrical space.

A second vent hole 27a is formed in the flange portion 18c of the outer cylinder 18 at the lower wall of the cylinder housing cylinder portion 27 so as to open the cylindrical space in a gap between the flange portions 18c and 19c of the inner and outer cylinders 18 and 19. The The flange portion 19c of the inner cylinder 19 is formed with a third ventilation hole 19f that opens the gap into the space inside the large diameter portion 19a of the inner cylinder 19 and the mounting cap 20.
A through cylinder 33 a that penetrates the outer cylinder 18 and opens the internal space of the cylinder 17 into the outer cylinder 18 is formed in a portion of the rear wall 17 a of the cylinder 17 that is located above the piston guide portion 32. The through cylinder 33 a opens in a space between the discharge valve 23 and the suction valve 24 in the inner cylinder 19 through a through hole 33 b formed in the suction cylinder portion 13.

The piston 16 has a cylindrical shape with the front end closed, and the rear portion 16b has a larger diameter than the front portion 16a. The piston 16 is provided at a rear end portion of the piston main body portion 35 that is opened rearward and into which the piston guide portion 32 is inserted, and is in sliding contact with the inner peripheral surface of the outer cylinder portion 31. And a sliding cylinder part 36.
The outer cylinder part 31 and the piston guide part 32 of the cylinder 17 and the piston main body part 35 and the sliding cylinder part 36 of the piston 16 are disposed on a common shaft (not shown) extending along the front-rear direction.

The sliding cylinder portion 36 has an inner diameter that is equal to the inner diameter of the piston main body portion 35 and an outer diameter larger than the outer diameter of the piston main body portion 35, and is coupled to the rear end surface of the piston main body portion 35.
The inner diameters of the piston main body part 35 and the sliding cylinder part 36 are larger than the outer diameter of the piston guide part 32, and the inner peripheral surface of the piston main body part 35 and the sliding cylinder part 36 and the outer peripheral surface of the piston guide part 32 are mutually different. Separate.

On the outer periphery of the piston 16, the piston main body portion 35 does not slidably contact the inner peripheral surface of the outer cylinder portion 31 of the cylinder 17, and only the sliding cylinder portion 36 slidably contacts with the fluid. On the outer periphery of the front and rear end portions of the sliding cylinder portion 36, tapered front and rear lips 36a and 36b each having a diameter increasing toward the end side are provided. The front and rear lips 36a and 36b are in liquid-tight pressure contact with the inner peripheral surface of the outer cylinder portion 31, respectively.
The piston 16 is urged forward together with the trigger portion 15 by the urging force of the elastic plate portion 26. The front portion 16a of the piston 16 is connected to the trigger portion 15. When the trigger portion 15 is pulled rearward, the piston 16 moves rearward and is pushed into the cylinder 17 (see FIG. 2). The piston 16 is in the most advanced position when the trigger portion 15 is in the foremost swing position, and at this time, the sliding cylinder portion 36 closes the first vent hole 31a. When the piston 16 moves backward by a predetermined amount due to the backward swing of the trigger portion 15, the sliding cylinder portion 36 opens the first vent hole 31 a to the outside of the cylinder 17.

  The trigger portion 15 includes a main plate member 41 that forms a front surface that is concave when viewed from the side, and a pair of side plate members 42 that rises rearward from the left and right side edges of the main plate member 41. The upper end portions of the side plate members 42 extend upward to reach the outer side of the injection cylinder portion 14 to form a pair of connecting portions 43 that sandwich the injection cylinder portion 14 from the left and right. A shaft portion 44 projects from the connecting portions 43 toward the outer side in the left-right direction. Both shaft portions 44 are rotatably supported by bearing portions 51 provided on the left and right sides of the upper plate member 50 covering the upper side of the injection cylinder portion 14. As a result, the trigger portion 15 can swing back and forth around both shaft portions 44.

  An opening 45 that penetrates the main plate member 41 in the front-rear direction is formed in the upper portion of the trigger portion 15. A cylindrical portion 46 is continuously provided behind the opening 45 so that the peripheral edge of the opening 45 extends rearward. A pair of shaft portions 48 project from the left and right sides of the inner peripheral surface of the rear portion of the cylindrical portion 46 toward the inner side in the left-right direction. Both shaft portions 48 are connected to both sides of the front portion 16a of the piston 16 so as to be rotatable and movable by a predetermined amount in the vertical direction. As a result, the piston 16 can move back and forth in the axial direction as the trigger portion 15 swings back and forth.

  A horizontal plate-like upper plate member 50 in the ejector body 11 is attached to the upper surface of the injection cylinder portion 14. Elastic plate portions 26 are integrally formed on the left and right sides of the upper plate member 50, respectively. The elastic plate portion 26 has a circular arc shape that protrudes forward in a side view, passes through both sides of the injection cylinder portion 14, and extends below the injection cylinder portion 14. The elastic plate portion 26 has a pair of leaf springs that are concentric with each other in a side view and are arranged in the front-rear direction. Hereinafter, the leaf spring located on the front side of the elastic plate portion 26 is referred to as a main leaf spring 26a, and the leaf spring located on the rear side is referred to as a sub leaf spring 26b. The lower ends of the two leaf springs 26a and 26b are integrally connected via an arcuate folded portion 26c. A latching piece 26d hangs down from the folded portion 26c, and the latching piece 26d is inserted and engaged with a pocket 49 formed on the side surface of the trigger portion 15 from above. The elastic plate portion 26 urges the trigger portion 15 forward via the locking piece 26d and the pocket portion 49.

  The trigger portion 15 is urged by the elastic plate portion 26 to bring the upper end of the main plate member 41 into contact with the lower end of the front end closing member 25, so that the trigger portion 15 reaches the foremost swing position. When the trigger portion 15 is pulled rearward from this position, the elastic plate portion 26 is elastically deformed so as to move the folded portion 26c backward via the locking piece 26d. At this time, the elastic plate portion 26 is elastically deformed so as to greatly bend and stretch the sub-plate spring 26b on the curved inner peripheral side with respect to the main plate spring 26a on the curved outer peripheral side. When the trigger portion 15 is in the foremost swing position, the locking piece 26d is inserted into and engaged with the pocket portion 49 of the trigger portion 15 as a whole, and when the trigger portion 15 is pulled backward, While being pulled upward from the pocket portion 49, the engagement state with the pocket portion 49 is maintained until the trigger portion 15 reaches the rearmost swing position.

  Compared with the case where a metal spring is used as the urging means, the trigger type liquid is formed by forming the urging means of the trigger portion 15 and the piston 16 with the synthetic resin elastic plate portion 26 integrally formed with the ejector body 11. Excellent recycling performance when the ejector 10 is discarded. On the rear side of the upper end portion of the elastic plate portion 26, a C-shaped bearing portion 51 that is opened rearward is integrally formed.

  The nozzle 12 is attached to a fourth fitting cylinder 60b that projects from the front side of the coupling body 60. On the inner side of the nozzle 12, a third fitting cylinder 12a that fits outside the fourth fitting cylinder 60b, and a front wall 12b that closes the front end of the third fitting cylinder 12a and has an ejection hole 12c formed in the center. And having. An outer locking claw 12f protrudes from the inner peripheral surface of the third fitting cylinder 12a, and an inner locking claw 60f protrudes from the outer peripheral surface of the fourth fitting cylinder 60b. The engagement between the inner and outer locking claws 12f and 60f restricts the third fitting cylinder 12a and the nozzle 12 from being separated from the fourth fitting cylinder 60b and the connecting body 60. In this state, the third fitting cylinder 12a and thus the nozzle 12 can rotate about the central axis common to the third and fourth fitting cylinders 12a and 60b with respect to the fourth fitting cylinder 60b and thus the coupling body 60. It is said.

  Inside the third fitting cylinder 12 a of the nozzle 12, a center cylinder 12 d that protrudes from the outer periphery of the center shaft 60 d on the front side of the connecting body 60 so as to be liquid-tight and rotatable is provided. A concave groove 68a extending in the front-rear direction is formed on the inner surface of the central cylinder 12d. The concave groove 68a is in communication with the concave groove 68b formed on the outer surface of the central shaft 60d at a predetermined rotational position of the nozzle 12, and is not in communication at other rotational positions. The central cylinder 12d and the central shaft 60d are arranged coaxially with the third and fourth fitting cylinders 12a and 60b. The nozzle 12 is turned around the central axis 60d to switch whether or not the liquid is ejected.

  On the front side of the nozzle 12, a nozzle plate 52 for switching the liquid ejection form between mist and foam is provided so as to be openable and closable around a shaft 52 a along the left-right direction. On the rear surface of the front wall 12b of the nozzle 12, a turning circuit 12e is recessed inside the central cylinder 12d, and between the central cylinder 12d and the third fitting cylinder 12a, on the inner periphery of the front part of the fourth fitting cylinder 60b. A sealing cylinder portion 12g that comes into contact is projected.

The connecting body 60 has a second fitting cylinder 60a that fits outside the first fitting cylinder 25a of the front end closing member 25 in front of the injection cylinder portion 14, and a second fitting that closes the front end of the second fitting cylinder 60a. A front wall 60c extending above the combined cylinder 60a, a receiving cylinder 60e extending rearward from the upper portion of the front wall 60c, a fourth fitting cylinder 60b protruding forward from the upper and lower central portion of the front wall 60c, and a fourth fitting A central axis 60d protruding forward from the front wall 60c inside the cylinder 60b.
A cylindrical passage space 61 is formed between the center shaft 60d and the center tube 12d of the nozzle 12 fitted on the center shaft 60d and the second fitting tube 60a. The passage space 61 communicates with the ejection hole 12c through the concave grooves 68a and 68b and the turning circuit 12e when the concave grooves 68a and 68b of the central shaft 60d and the central cylinder 12d communicate with each other.

A portion of the front wall 60c located below the central axis 60d is formed with a first series of through holes 62 that connect the passage space 61 and the internal space 25f of the first fitting cylinder 25a of the front end closing member 25. The front end opening 14a of the injection cylinder portion 14 faces the internal space 25f of the first fitting cylinder 25a through the injection hole 25e of the front end closing member 25. On the lower rear surface of the front wall 60c, a seal tube portion 60g that contacts the inner periphery of the front portion of the first fitting tube 25a projects from the inside of the second fitting tube 60a. The first introduction hole has a larger flow area than the first introduction path 68 formed by the concave grooves 68a and 68b of the central shaft 60d and the central cylinder 12d.
A second communication hole 63 that connects the passage space 61 and the internal space of the housing cylinder 60e is formed in a portion of the front wall 60c located above the central axis 60d.

  Here, the first fitting cylinder 25a and the central protrusion 25d provided on the front side of the front end closing member 25 have the same form as the fourth fitting cylinder 60b and the central shaft 60d provided on the front side of the coupling body 60. Further, the second fitting cylinder 60a and the seal cylinder part 60g provided on the lower rear side of the coupling body 60 have the same form as the third fitting cylinder 12a and the seal cylinder part 12g provided inside the nozzle 12. That is, when the connecting body 60 is eliminated, the nozzle 12 can be mounted on the front side of the front end closing member 25.

  The storage cylinder 60e extends in the front-rear direction above the injection cylinder part 14 in parallel with the injection cylinder part 14. The accommodating cylinder 60e accommodates therein an auxiliary piston 64 that is urged forward by a metal coil spring 65 and is movably moved backward. The rear end portion of the storage cylinder 60e extends to the rear of the suction cylinder portion 13. A rear end cap 66 that supports the rear end portion of the coil spring 65 is fitted into the rear end portion of the accommodating cylinder 60e. The auxiliary piston 64 is liquid-tightly inserted into the storage cylinder 60e. The storage cylinder 60e and the auxiliary piston 64 constitute a sub tank 67 capable of sucking and discharging liquid with respect to the passage space 61 through the second communication hole 63.

The auxiliary piston 64 includes a piston main body 64a that supports the front portion of the coil spring 65 and receives a spring force, and a packing 64d that is fitted to the front end portion of the piston main body 64a.
The piston main body 64a is formed in a cylindrical shape extending rearward with the front end closed, and a diameter-expanding guide portion 64b close to the inner surface of the receiving cylinder 60e is formed on the outer periphery of the front end. A protrusion 64c is formed. The rear part of the piston main body 64 a is inserted into the coil spring 65. The front end of the coil spring 65 is in contact with the rear surface of the enlarged diameter guide portion 64b. The coil spring 65 is contracted between the enlarged diameter guide portion 64b and the rear end cap 66, and biases the piston body 64a forward.

  The packing 64d has a cylindrical shape with a closed front end, and is externally fitted to match the shape of the front end of the piston body 64a. Tapered front and rear lips 64e and 64f each having a diameter increasing toward the distal end are provided on the outer periphery of the front and rear ends of the packing 64d. The front and rear lips 64e and 64f are in liquid-tight pressure contact with the inner peripheral surface of the storage cylinder 60e, respectively.

  The rear end cap 66 has a cylindrical shape with the front end closed, and is fitted into the rear end portion of the receiving cylinder 60e so that the front surface of the rear end flange 66a abuts the rear end of the receiving cylinder 60e. The rear end of the coil spring 65 contacts the front wall 66b of the rear end cap 66. In the center of the front wall 66b of the rear end cap 66, an air hole 66c for allowing air in and out of the storage cylinder 60e when the auxiliary piston 64 moves is formed.

  The auxiliary piston 64 has a state in which the front surface of the packing 64d is in contact with the rear surface of the front wall 60c of the coupling body 60 as the most advanced position. When the auxiliary piston 64 is at the most advanced position, the liquid comes out from the sub tank 67. When the auxiliary piston 64 is at the most advanced position, the auxiliary piston 64 is separated from the rear end cap 66 and can move rearward. The auxiliary piston 64 has a state in which the rear end of the piston main body 64a is in contact with the front surface of the rear end cap 66 as a last retracted position. When the auxiliary piston 64 is in the last retracted position, the liquid is completely in the sub tank 67.

The operation of the above configuration will be described below.
First, the trigger type liquid ejector 10 is attached to the mouth part of the container body containing the liquid to be ejected, and the trigger part 15 is operated a plurality of times to fill each part of the trigger type liquid ejector 10 with the liquid. The liquid can be sucked up from the tube portion 13. Thereafter, when the trigger portion 15 is pulled backward against the urging force of the elastic plate portion 26, the piston 16 moves backward to introduce the liquid in the cylinder 17 into the suction cylinder portion 13, and this liquid is sucked in by the suction valve 24. Is pushed down and closed, and the discharge valve 23 is pushed up and opened to be introduced into the injection cylinder portion 14 (see FIG. 2). Thereafter, the liquid introduced into the injection cylinder portion 14 is introduced into the passage space 61 through the front end opening 14a, the injection hole 25e, the internal space 25f of the first fitting cylinder 25a, and the first series of through holes 62. The liquid introduced into the passage space 61 is ejected to the front of the nozzle 12 from the ejection hole 12c through the first introduction path 68 and the turning circuit 12e formed by the concave grooves 68a and 68b of the central shaft 60d and the central cylinder 12d.

  At this time, since the flow path area of the first introduction path 68 is smaller than the flow path area of the first series passage hole 62, the pressure of the liquid introduced from the first series passage hole 62 into the passage space 61 increases. Since the passage space 61 communicates with the accommodation cylinder 60e through the second communication hole 63, when the pressure of the liquid in the passage space 61 increases, a part of the liquid is introduced into the accommodation cylinder 60e. In the present embodiment, as an example, it is designed such that about half of the liquid introduced into the passage space 61 is directly ejected from the nozzle 12 and the remaining half is introduced into the containing cylinder 60e. When the liquid is introduced into the storage cylinder 60e, the auxiliary piston 64 moves backward against the biasing force of the coil spring 65.

  Next, when the trigger portion 15 is released, the piston 16 moves forward by the elastic restoring force of the elastic plate portion 26, and a negative pressure is generated in the cylinder 17. Due to this negative pressure, the liquid in the container body is sucked up from the pipe 21, and the liquid pushes up the suction valve 24 to open and is introduced into the cylinder 17. At this time, the discharge valve 23 is closed.

  On the other hand, on the nozzle 12 side, liquid introduction from the injection cylinder portion 14 to the passage space 61 stops, but the liquid introduced into the accommodation cylinder 60e is advanced by the auxiliary piston 64 by the elastic restoring force of the coil spring 65. Then, it is introduced into the passage space 61 through the second communication hole 63, and is ejected forward of the nozzle 12 from the ejection hole 12c through the first introduction path 68 and the turning circuit 12e. That is, not only the operation of pulling the trigger portion 15 backward, but also the operation of the trigger portion 15 returning to the front, the liquid is ejected from the nozzle 12, and the liquid can be continuously ejected.

  If the trigger portion 15 is not pulled again when the auxiliary piston 64 moves forward, the auxiliary piston 64 moves forward to the most advanced position, but the operation of pulling the trigger portion 15 can be repeated before that. In this case, the auxiliary piston 64 repeatedly moves backward and forward with a substantially constant width, and gradually moves backward as a whole. Thereby, the liquid gradually accumulates in the storage cylinder 60e. Then, by moving the auxiliary piston 64 to the last retracted position, the liquid can be continuously ejected for a long time until the auxiliary piston 64 moves from the last retracted position to the most advanced position.

  In a state where the auxiliary piston 64 has moved back to the last retracted position and the storage cylinder 60e has been completely filled with liquid, all of the liquid introduced into the passage space 61 by the operation of the trigger unit 15 is directly ejected from the nozzle 12. In addition, a return passage that is opened when the auxiliary piston 64 is fully retracted may be provided to return a part of the liquid in the passage space 61 into the container.

  As described above, in the trigger type liquid ejector 10 of the present embodiment, the first series that opens toward the front end opening 14 a of the injection cylinder portion 14 in the connecting body 60 that communicates the ejector body 11 and the nozzle 12. The first introduction passage 68 that guides the liquid from the through-hole 62 and the liquid from the first series through-hole 62 to the ejection hole 12 c of the nozzle 12 and has a smaller channel cross-sectional area than the first series through-hole 62, and the first series through-hole 62 and the first introduction path 68 are formed, and the inside of the accommodating cylinder 60e and the passing space 61 are communicated with the front end portion of the accommodating cylinder 60e that accommodates the auxiliary piston 64 in the forward biased state. A second communication hole 63 is formed.

  Thereby, when pulling the trigger part 15 and injecting the liquid in front of the nozzle 12, a part of the liquid introduced into the passage space 61 is introduced into the accommodating cylinder 60 e through the second communication hole 63, and then the trigger When the portion 15 is released, the liquid introduced into the storage cylinder 60 e is ejected from the nozzle 12 through the second communication hole 63 and the passage space 61. That is, not only when the trigger portion 15 is pulled backward, but also when the trigger portion 15 returns to the front, the liquid is ejected from the nozzle 12, and continuous liquid ejection is possible.

  Moreover, since the connection body 60 becomes an attachment of the sub-tank 67, and the nozzle 12 is connected to the ejector body 11 through the connection body 60, the connection body 60 and the nozzle 12 can be continuously connected without special changes and processing. The trigger type liquid ejector 10 which enabled injection can be comprised easily.

<Second embodiment>
Next, a second embodiment of the present invention will be described with reference to FIG.
In the trigger type liquid ejector 110 of the second embodiment, a nozzle adapter 70 is further attached to the front side of the coupling body 60 with respect to the first embodiment, and a pressure accumulation type nozzle 112 is provided on the front side of the nozzle adapter 70. It differs especially in the point of wearing. The other components that are the same as those in the above embodiment are given the same reference numerals, and detailed description thereof is omitted.

  The fifth fitting cylinder 70a inside the nozzle adapter 70 is fitted on the fourth fitting cylinder 60b on the front side of the connecting body 60. Inside the fourth fitting cylinder 60b, a cylindrical passage space 71 having a central axis 60d disposed at the center is formed. The passage space 71 has a lower rear side communicating with the inner space 25f of the first fitting cylinder 25a through the first through-hole 62, and an upper front side having a pressure accumulation chamber 112d inside the nozzle 112 via the second introduction path 72. Communicate with. The flow path area of the second introduction path 72 is smaller than the flow path area of the first through hole 62.

  The nozzle adapter 70 includes a second front wall 70c that is spaced forward of the front wall 60c of the coupling body 60 and faces the front wall 60c, a peripheral wall 70d that extends from the outer periphery of the second front wall 70c to the outer periphery of the front wall 60c, A fifth fitting cylinder 70a that protrudes rearward from the second front wall 70c and fits outside the fourth fitting cylinder 60b, and a fourth fitting cylinder 60b that stands rearward inside the fifth fitting cylinder 70a. And a seal tube portion 70e in contact with the inner periphery of the front portion. The fifth fitting cylinder 70a and the seal cylinder part 70e have the same configuration as the second fitting cylinder 60a and the seal cylinder part 60g of the connecting body 60.

  Inside the nozzle 112, a seventh fitting cylinder 112 a that is externally fitted to a sixth fitting cylinder 70 b that protrudes from the upper front side of the nozzle adapter 70, and a front end of the seventh fitting cylinder 112 a are closed and centered. And a front wall 112b in which an ejection hole 112c is formed. The nozzle 112 is restricted from being detached from the nozzle adapter 70 by the fitting of the sixth and seventh fitting cylinders 70b and 112a, and around the central axis common to the sixth and seventh fitting cylinders 70b and 112a. It can be turned.

  A pressure accumulation chamber 112 d for accommodating the pressure accumulation valve 73 is formed in the nozzle 112. The pressure accumulation valve 73 is urged forward by a metal coil spring 74 to close the ejection hole 112c. The latter half of the pressure accumulating valve 73 forms a small diameter piston portion 73a, and the front half of the pressure accumulating valve 73 forms a large diameter piston portion 73b. The pressure accumulating valve 73 causes the pressure of the liquid introduced from the passage space 71 to act on both piston portions. When this pressure exceeds a certain level, the pressure accumulating valve 73 moves backward due to the difference in diameter between the two cylinder portions, and the ejection hole 112c is opened.

  In the trigger type liquid ejector 110 of the second embodiment described above, the front end opening 14a of the injection cylinder portion 14 is connected to the connection body 60 among the connection body 60 and the nozzle adapter 70 that communicate the ejector body 11 and the nozzle 112. A first through-hole 62 is formed to open toward the nozzle, the liquid from the first through-hole 62 is guided to the nozzle adapter 70 to the ejection hole 112c of the nozzle 112, and the flow path is cut off from the first through-hole 62. A second introduction path 72 having a small area, and a passage space 71 that connects the first through hole 62 and the second introduction path 72 are formed, and the accommodation cylinder 60e that accommodates the auxiliary piston 64 in a forward-biased state is formed. A second communication hole 63 that communicates the inside of the accommodating cylinder 60e and the passage space 71 is formed at the front end.

  As a result, as in the first embodiment, not only the operation of pulling the trigger portion 15 backward, but also the operation of the trigger portion 15 returning to the front, the liquid is ejected from the nozzle 112, and the liquid can be continuously ejected. . In addition, by mounting the pressure accumulation type nozzle 112, stable liquid injection at a predetermined pressure becomes possible, and when the injection pressure becomes lower than the predetermined pressure, the pressure accumulation valve 73 is closed to suppress liquid leakage from the nozzle 112. It is done.

  Moreover, since the connection body 60 becomes an attachment of the sub-tank 67, and the nozzle 112 is connected to the ejector body 11 via the connection body 60 and the nozzle adapter 70, the change can be connected to the ejector body 11 and the nozzle 112. By using a small nozzle adapter, it is possible to easily configure the trigger type liquid ejector 110 that enables continuous ejection.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in each of the above embodiments, the attachment of the sub-tank 67 is attached without changing the existing nozzles 12 and 112 and the ejector main body 11, but a new one in which various functions are added to the nozzle and the ejector main body, etc. It is good. In addition, it is possible to appropriately replace the constituent elements in the above-described embodiment with known constituent elements.

DESCRIPTION OF SYMBOLS 10,110 Trigger type liquid ejector 11 Ejector main body 12,112 Nozzle 12a 3rd fitting cylinder (3rd mounting part)
12c, 112c Ejection hole 13 Suction cylinder part 14 Injection cylinder part 14a Front end opening 15 Trigger part 25a First fitting cylinder (first mounting part)
60 coupling body 60a second fitting cylinder (second mounting portion)
60b Fourth fitting cylinder (fourth mounting part)
60e Receiving cylinder 61, 71 Passing space 62 First communication hole 63 Second communication hole 64 Auxiliary piston 68 First introduction path 70 Nozzle adapter (connector)
72 Second introduction route (first introduction route)

Claims (3)

An ejector body, and a nozzle provided at a front end of the ejector body and having an ejection hole formed therein,
The ejector body includes a suction tube portion extending in the vertical direction, an injection tube portion extending forward from the suction tube portion, and extending downward from the injection tube portion, A trigger portion arranged to be swingable rearward in a forward biased state,
When the trigger portion is swung rearward, the liquid is passed through the inside of each of the suction tube portion and the injection tube portion, and through the ejection hole of the nozzle provided in front of the injection tube portion. A trigger-type liquid ejector for ejecting,
Comprising a connector for communicating the ejector body and the nozzle;
The coupling body includes a storage cylinder that extends in the front-rear direction, and an auxiliary piston that is disposed in the storage cylinder so as to be movable backward in a forward-biased state.
The coupling body has a first series of holes that open toward the front end opening of the injection cylinder portion, and guides liquid from the first series of holes to the ejection holes of the nozzle, and the first series of holes. A first introduction path having a smaller channel cross-sectional area, and a passage space that communicates the first series of through holes and the first introduction path, are formed,
The trigger type liquid ejector according to claim 1, wherein a second communication hole that communicates the inside of the storage cylinder and the passage space is formed at a front end portion of the storage cylinder. The connecting body includes a second mounting portion mounted on a first mounting portion formed at a front end portion of the injection cylinder portion, and a fourth mounting portion mounted on a rear end portion of the nozzle. A mounting portion;
The trigger type liquid ejector according to claim 1, wherein the third mounting portion of the nozzle is formed so as to be mountable on the first mounting portion of the injection cylinder portion.   3. The trigger type liquid ejector according to claim 1, wherein the storage cylinder extends above the injection cylinder portion in parallel with the injection passage portion. 4.

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