JP6971190B2 - Triggered liquid ejector - Google Patents

Description

The present invention relates to a trigger type liquid ejector.

Conventionally, as shown in Patent Document 1 below, a trigger type liquid ejector capable of continuously injecting a liquid has been known. This trigger type liquid ejector has an ejector body mounted on a container body containing a liquid, and a nozzle portion arranged in front of the ejector body and having an ejection hole for ejecting the liquid forward. , Is equipped. The ejector main body includes a vertical supply cylinder portion, an injection cylinder portion, a trigger mechanism, a storage cylinder, and a storage plunger. The vertical supply cylinder portion extends in the vertical direction and sucks up the liquid in the container. The injection cylinder portion is provided in front of the vertical supply cylinder portion, and guides the liquid in the vertical supply cylinder portion to the ejection hole. The trigger mechanism has a trigger portion extending downward from the injection cylinder portion. A storage plunger in a forward urged state is provided in the storage cylinder.
This trigger type liquid discharger is configured so that the liquid is temporarily stored in the storage cylinder while the storage plunger moves backward with the operation of the trigger portion. Then, even if the operation of the trigger portion is stopped, the liquid is continuously ejected from the ejection hole as the storage plunger moves forward due to the forward urging force.

Japanese Unexamined Patent Publication No. 2017-2134997

In this type of trigger type liquid ejector, it is required to increase the volume of the portion of the storage plunger in which the liquid can be stored so that more liquid can be continuously injected. Here, if the stroke amount toward the rear of the storage plunger is simply increased so that more liquid can be stored in the storage plunger, the dimension of the ejector main body in the front-rear direction becomes large.

The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a trigger type liquid ejector capable of continuously injecting a larger amount of liquid while suppressing the bulkiness of the ejector main body.

In order to solve the above problems, the trigger type liquid ejector according to one aspect of the present invention is arranged in front of the ejector main body mounted on the container body containing the liquid and the ejector main body to discharge the liquid. A nozzle portion having a ejection hole for ejecting is provided, and the ejector main body extends in the vertical direction to suck up the liquid in the container and in front of the vertical supply cylinder portion. It has an injection cylinder portion that is arranged and guides the liquid in the vertical supply cylinder portion to the ejection hole, and a trigger portion that is arranged in front of the vertical supply cylinder portion so as to be movable rearward in a forward urged state. A trigger type liquid ejector including a trigger mechanism for flowing a liquid from the vertical supply cylinder portion through the injection cylinder portion toward the ejection hole side by moving the trigger portion to the rear, wherein the trigger mechanism is provided. Is a main cylinder that moves back and forth with the movement of the trigger portion, and a main cylinder whose inside is pressurized and depressurized with the movement of the main piston and whose inside communicates with the inside of the vertical supply cylinder portion. The ejector main body has a storage cylinder in which the liquid that has passed through the vertical supply cylinder portion is supplied to the inside by moving the trigger portion to the rear, and an axial direction in the storage cylinder along the central axis thereof. A storage plunger that is movably arranged and moves toward one side of the axial direction as the liquid is supplied into the storage cylinder, and the inside of the container and the vertical direction when pressurization is performed in the main cylinder. A first check valve that cuts off communication with the inside of the supply cylinder and allows communication between the inside of the container and the inside of the vertical supply cylinder when the pressure is reduced in the main cylinder, and the storage when pressurization in the main cylinder. A second check valve that allows communication between the inside of the cylinder and the inside of the vertical supply cylinder portion and shuts off communication between the inside of the storage cylinder and the inside of the vertical supply cylinder portion when depressurizing the inside of the main cylinder, and the storage plunger. An urging member that generates an urging force toward the other side in the axial direction, a first end portion connected to the storage plunger, and a second end portion connected to the storage cylinder. A band having an intermediate portion located between the first end portion and the second end portion and receiving the urging force of the urging member is provided.

According to the above aspect, when the trigger portion is pulled backward and moved, the main piston moves rearward from the frontmost position to pressurize the inside of the main cylinder. As a result, the liquid in the main cylinder is supplied into the vertical supply cylinder portion. At this time, the first check valve blocks communication between the inside of the container and the inside of the vertical supply cylinder portion, and the second check valve allows communication between the ejection hole and the inside of the vertical supply cylinder portion. Therefore, the liquid supplied from the main cylinder into the vertical supply cylinder portion can be supplied into the storage cylinder through the vertical supply cylinder portion, and the inside of the storage cylinder can be pressurized. As a result, the storage plunger can be moved toward one side in the axial direction while supplying the liquid into the storage cylinder.
Therefore, each time the trigger portion is pulled, the storage plunger can be moved to store (fill) the liquid in the storage cylinder.

When the operation of the trigger part is stopped after filling the storage cylinder with the liquid, the supply of the liquid into the storage cylinder through the vertical supply cylinder part is stopped, but the storage plunger is restored and moved by the urging force of the urging member. do. As a result, the liquid filled in the storage cylinder can be pushed out from the storage cylinder toward the ejection hole side, and can be ejected from the ejection hole. Therefore, continuous injection of liquid can be performed.
Moreover, during continuous injection of liquid, the outflow of liquid from the storage cylinder to the vertical supply cylinder side can be regulated by the second check valve, so that the liquid is injected to the outside at a high pressure, for example, from the ejection hole. Can be done.

The ejector main body is provided with a band having a first end portion connected to the storage plunger, a second end portion connected to the storage cylinder, and an intermediate portion receiving the urging force of the urging member. .. According to this configuration, when the storage plunger moves toward one side in the axial direction, the first end portion approaches the second end portion following the movement. At this time, since the intermediate portion receives the urging force of the urging member, the band body is deformed so as to be folded in a state where the tension caused by the urging force is applied. That is, the band acts like a moving pulley. As a result, even if the stroke amount of the storage plunger toward one side in the axial direction is increased and the volume of the liquid that can be stored in the storage cylinder is increased, the space on one side of the storage plunger in the storage cylinder is increased. Can be made smaller, and the bulkiness of the ejector body can be suppressed.
Furthermore, due to the principle of work in the moving pulley, about half of the restoring force of the urging member acts as an urging force on the storage plunger. For this reason, compared to the case where a moving pulley is not used, for example, when a coil spring is used as an urging member, the restoring force can be doubled, the number of effective turns can be reduced, and the contact height can be reduced. can. The smaller the contact height of the coil spring as the urging member, the larger the stroke amount of the storage plunger can be while suppressing the bulkiness of the ejector body.

Here, the storage cylinder extends in the front-rear direction, and the ejector main body is provided with an actuating member arranged so as to be movable rearward with respect to the storage cylinder, and the actuating member is attached to the storage plunger. The locked portion is arranged rearward from the formed locked portion, and when the storage plunger moves rearward, the locked portion is locked from the front and the operation is performed with respect to the storage cylinder. When the member moves backward, it may have a restricting portion that is close to or abuts on the trigger portion to regulate the swing of the trigger portion.

In this case, when the storage plunger moves significantly backward by continuously and repeatedly pulling the trigger portion, the locked portion of the storage plunger is locked to the locking portion of the operating member. Therefore, when the storage plunger further moves backward due to the further operation of the trigger portion, the operating member moves rearward with respect to the storage cylinder. As a result, the restricting portion of the operating member can be brought close to or in contact with the trigger portion, and the swing of the trigger portion can be regulated.
Therefore, it is possible to mechanically prevent the storage plunger from moving excessively toward the rear, and it is possible to prevent the storage cylinder from being filled with more liquid than the allowable amount. As a result, it is possible to prevent the pressure in the storage cylinder from rising excessively and prevent problems such as breakage from occurring.

Further, the storage cylinder is formed with a recovery hole for communicating the inside of the storage cylinder and the inside of the vertical supply cylinder portion when the storage plunger moves backward by a predetermined amount or more, and the vertical supply cylinder portion is formed with the recovery hole. A collection passage may be formed that communicates with the hole and vertically traverses the vertical supply cylinder portion to communicate with the inside of the container.

In this case, when the storage plunger moves backward by a predetermined amount or more, the inside of the storage cylinder and the inside of the container communicate with each other through the collection hole and the collection passage. As a result, when the storage plunger is moved backward by a predetermined amount or more and the liquid is further introduced into the storage cylinder, the liquid can be returned to the inside of the container through the recovery hole and the recovery passage. Therefore, it is possible to prevent the pressure in the storage cylinder from becoming excessively high.

Further, the intermediate portion may be folded back so as to open toward the one side in the axial direction.

In this case, since the intermediate portion that receives the urging force of the urging member is the folded portion of the band, the urging force of the urging member can be more reliably received and transmitted to the storage plunger.
In addition, the strips change so that as the storage plunger moves axially, the length between the middle and the first end and the length between the middle and the second end change. Deform. Therefore, for example, it is possible to prevent the band from loosening due to the movement of the storage plunger, and the storage plunger can be moved more smoothly.

According to the above aspect of the present invention, it is possible to provide a trigger type liquid ejector capable of continuously injecting a larger amount of liquid while suppressing the bulkiness of the ejector main body in the front-rear direction.

It is a vertical sectional view of the trigger type liquid ejector which concerns on 1st Embodiment. FIG. 3 is an enlarged vertical cross-sectional view of the periphery of the vertical supply cylinder portion of FIG. 1. It is an enlarged vertical sectional view around the storage plunger of FIG. FIG. 3 is a cross-sectional view taken along the line AA of FIG. It is a vertical sectional view which shows the state which the storage plunger moved backward from the state shown in FIG. It is a vertical sectional view of the trigger type liquid ejector which concerns on 2nd Embodiment. FIG. 6 is an enlarged vertical cross-sectional view of the periphery of the vertical supply cylinder portion of FIG. It is an enlarged vertical sectional view around the storage plunger of FIG. It is a vertical sectional view which shows the state which the storage plunger moved backward from the state shown in FIG.

(First Embodiment)
Hereinafter, the first embodiment of the trigger type liquid ejector according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the trigger type liquid ejector 1A of the present embodiment is attached to a container body A for accommodating a liquid, and has an ejector main body 2 having a vertical supply cylinder portion 10 for sucking up the liquid, and an ejector hole 4. Is formed and includes a nozzle portion 3 mounted on the ejector main body 2.
Unless otherwise specified, each configuration of the trigger type liquid ejector 1A is a molded product using a synthetic resin.

Here, in the present embodiment, the central axis of the vertical supply cylinder portion 10 is referred to as the axis O1, the container A side is referred to as the lower side, and the opposite side thereof is referred to as the upper side along the axis O1. Further, one direction orthogonal to the axis O1 is referred to as a front-back direction, and a direction orthogonal to both the axis O1 direction and the front-back direction is referred to as a left-right direction.
The nozzle portion 3 is arranged above the ejector main body 2.

The ejector main body 2 extends from the vertical supply cylinder portion 10 extending in the vertical direction and the vertical supply cylinder portion 10 in the front-rear direction, and the inside communicates with the inside of the vertical supply cylinder portion 10. 11 is provided, and is formed in an L shape when viewed from the left and right directions.
Of the front-rear directions, the direction in which the injection cylinder portion 11 extends from the vertical supply cylinder portion 10 is referred to as the front, and the opposite direction is referred to as the rear.

The vertical supply cylinder portion 10 includes a topped cylinder-shaped outer cylinder 12 and an inner cylinder 13 fitted in the outer cylinder 12.
As shown in FIG. 2, the outer cylinder 12 has a large diameter portion 12a, a small diameter portion 12b arranged above the large diameter portion 12a and having a smaller diameter than the large diameter portion 12a, and an upper end portion of the large diameter portion 12a. A flange portion 12c that connects the small diameter portion 12b and the lower end portion of the small diameter portion 12b is provided, and the diameter is reduced from the lower side to the upper side to form a two-stage cylinder. The upper end opening of the small diameter portion 12b is closed by the top wall portion 12d.

The inner cylinder 13 has a large diameter portion 13a, a small diameter portion 13b arranged above the large diameter portion 13a and reduced in diameter from the large diameter portion 13a, an upper end portion of the large diameter portion 13a, and a lower end portion of the small diameter portion 13b. It is provided with a flange portion 13c for connecting the above, and is formed in a two-stage tubular shape whose diameter is reduced from the lower side to the upper side.

In the small diameter portion 13b of the inner cylinder 13, the upper portion of the pipe 15 arranged in the container body A and having the lower end opening located at the bottom portion of the container body A (not shown) is fitted. The flange portion 13c of the inner cylinder 13 is located below the flange portion 12c of the outer cylinder 12 with a gap S1 secured between the flange portion 13c of the inner cylinder 12 and the flange portion 12c of the outer cylinder 12. In the large-diameter portion 13a of the inner cylinder 13, an annular flange portion 13d protruding outward in the radial direction is formed in a portion of the outer cylinder 12 protruding downward from the large-diameter portion 12a. The flange portion 13d is arranged in the upper end portion of the mounting cap 14 mounted (for example, screwed) on the mouth portion A1 of the container body A, and is rotatably locked to the upper end portion of the mounting cap 14 around its axis. .. The flange portion 13d is sandwiched in the vertical direction by the mounting cap 14 and the upper end opening edge of the mouth portion A1 of the container body A.
The axis O1 of the vertical supply cylinder portion 10 composed of the outer cylinder 12 and the inner cylinder 13 is eccentric to the rear with respect to the container shaft of the container body A.

The rear end of the injection cylinder portion 11 is connected to the front side of the upper end portion of the vertical supply cylinder portion 10. The inside of the injection cylinder portion 11 communicates with the inside of the vertical supply cylinder portion 10 through the outer ejection hole 16 formed in the outer cylinder 12 and the inner ejection hole 17 formed in the inner cylinder 13.

A second check valve (discharge valve) 30 formed so as to be elastically deformable in the vertical direction is arranged inside the inner cylinder 13 on the upper end side.
The second check valve 30 is fitted in the inner cylinder 13 and is arranged below the base portion 31 and the base portion 31 that abuts on the lower surface of the top wall portion 12d of the outer cylinder 12, and is the inner circumference of the inner cylinder 13. It includes a valve body 33 that comes into contact with the valve seat 32 formed in a stepped shape on the surface from above, and a hollow spring portion 34 that vertically connects the base portion 31 and the valve body 33.

The valve body 33 is pressed from above by the hollow spring portion 34 and is in close contact with the valve seat 32. As a result, the valve body 33 blocks communication between the space located above the valve seat 32 and the space located below the valve seat 32 in the inner cylinder 13.
The valve body 33 rises against the urging force of the hollow spring portion 34, and by separating from the valve seat 32, the space located above the valve seat 32 in the inner cylinder 13 and the valve seat 32. Also communicates with the space located below.

An annular tapered cylinder portion 35 protruding inward is formed on a portion of the inner peripheral surface of the inner cylinder 13 located below the valve seat 32 and above the upper end of the pipe 15. There is.
The diameter of the tapered cylinder portion 35 is gradually reduced toward the bottom. Inside the tapered cylinder portion 35, a spherical first check valve (suction valve) 36 that is seated on the inner peripheral surface of the tapered cylinder portion 35 so as to be detachable is arranged. The first check valve 36 communicates with and shuts off the space located above the tapered cylinder portion 35 and the space located below the tapered cylinder portion 35 in the inner cylinder 13.

In the outer cylinder 12, a cylinder portion 40 projecting forward is integrally formed in a portion located below the injection cylinder portion 11.
The cylinder portion 40 is open toward the front and is partially integrally formed with the flange portion 12c of the outer cylinder 12.

The ejector main body 2 extends downward from the injection cylinder portion 11 and moves in the front-rear direction in conjunction with the swing of the trigger portion 51 and the trigger portion 51 which are oscillated rearward in a forward urged state. The main piston 52, the main cylinder 53 whose inside is pressurized and depressurized as the main piston 52 moves, the elastic plate portion 54 that urges the trigger portion 51 forward, the vertical supply cylinder portion 10, and the injection cylinder portion. 11 and a cover body 55 (see FIG. 1) that covers the entire storage member 90 (see FIG. 1) described later from above, rear, and left and right directions are further provided.

Further, the above-mentioned second check valve 30, first check valve 36, trigger portion 51, main piston 52, main cylinder 53, and elastic plate portion 54 vertically swing the trigger portion 51 to the rear. It constitutes a trigger mechanism 50 that is introduced from the inside of the supply cylinder portion 10 into the injection cylinder portion 11 and is injected from the inside of the injection cylinder portion 11 to the ejection hole 4 side.

The main cylinder 53 is provided so as to project forward from the outer cylinder portion 60 that opens toward the front, the rear wall portion 61 that closes the rear opening of the outer cylinder portion 60, and the central portion of the rear wall portion 61. It includes a piston guide 62 whose front end is closed.

The inside of the piston guide 62 is open to the rear, and the fitting cylinder portion 41 projecting forward from the rear wall (small diameter portion 12b of the outer cylinder 12) of the cylinder portion 40 is provided in the opening. It is fitted.
The outer cylinder portion 60 is fitted inside the cylinder portion 40. The inner peripheral surface of the cylinder portion 40 and the outer peripheral surface of the outer cylinder portion 60 are in close contact with each other at both ends in the front-rear direction. On the other hand, an annular gap S2 is secured in the intermediate portion between the inner peripheral surface of the cylinder portion 40 and the outer peripheral surface of the outer cylinder portion 60, which is located between both ends in the front-rear direction. ..

The outer cylinder portion 60 is formed with a first ventilation hole 63 for communicating the inside of the outer cylinder portion 60 with the gap S2. In the flange portion 12c of the outer cylinder 12, the gap S2 and the gap S1 defined between the flange portion 12c of the outer cylinder 12 and the flange portion 13c of the inner cylinder 13 communicate with each other. Is formed. Further, the flange portion 13c of the inner cylinder 13 is formed with a third ventilation hole 65 for communicating the gap S1 with the large diameter portion 13a of the inner cylinder 13 and the inside of the mounting cap 14.

The rear wall portion 61 of the main cylinder 53 is formed with a first through hole 66 penetrating in the front-rear direction in a portion located above the piston guide 62. In the illustrated example, a tubular portion protruding rearward is formed at the opening peripheral edge portion of the first through hole 66 in the rear wall portion 61, and this tubular portion is formed in the small diameter portion 12b of the outer cylinder 12. It is fitted in the through hole. The first through hole 66 is formed between the second check valve 30 and the first check valve 36 in the inner cylinder 13 through the second through hole 67 formed in the inner cylinder 13 of the vertical supply cylinder portion 10. It communicates with the space located in.
As a result, the inside of the main cylinder 53 is a space located between the second check valve 30 and the first check valve 36 in the inner cylinder 13 through the first through hole 66 and the second through hole 67. Communicate with. Therefore, the second check valve 30 switches the communication between the inside of the injection cylinder portion 11 and the inside of the main cylinder 53 and the shutoff thereof, and the first check valve 36 communicates between the inside of the container body A and the inside of the main cylinder 53 and Switch the cutoff.

The main piston 52 includes a cylindrical connecting portion 70 connected to the trigger portion 51, and a piston cylinder 71 located behind the connecting portion 70 and having a diameter larger than that of the connecting portion 70, as a whole. It is formed in the shape of a cylinder that opens to the rear.
The main cylinder 53 and the main piston 52 are arranged on a common axis (not shown) extending along the front-rear direction.

The piston cylinder 71 is an outer cylinder that opens rearward and protrudes outward in the radial direction from the piston main body 72 into which the piston guide 62 is inserted and the rear end of the piston main body 72. A sliding cylinder portion 73 that is in close sliding contact with the inner peripheral surface of the portion 60 is provided.

The inner diameter of the piston body 72 is formed to be larger than the outer diameter of the piston guide 62. In the illustrated example, there is a slight gap between the inner peripheral surface of the piston body 72 and the outer peripheral surface of the piston guide 62.
At the rear end of the piston body 72, an annular inner lip portion 72a is formed that projects inward in the radial direction of the piston body 72 and is in close sliding contact with the outer peripheral surface of the piston guide 62. As a result, a sealing property is ensured between the inner lip portion 72a and the outer peripheral surface of the piston guide 62.
The sliding cylinder portion 73 is formed in a tapered shape that gradually expands in diameter from the central portion in the front-rear direction toward the front and rear, and the lip portions 73a located at both ends in the front-rear direction form the inner peripheral surface of the outer cylinder portion 60. Sliding against.

The connecting portion 70 of the main piston 52 is connected to the trigger portion 51 via a connecting shaft 86 described later. As a result, the main piston 52 is urged forward together with the trigger portion 51 by the urging force of the elastic plate portion 54, and moves rearward as the trigger portion 51 moves rearward into the main cylinder 53. Be pushed in.

Further, when the trigger portion 51 is in the foremost swing position, the sliding cylinder portion 73 of the main piston 52 closes the first ventilation hole 63. Then, when the main piston 52 moves rearward by a predetermined amount due to the rearward swing of the trigger portion 51, the sliding cylinder portion 73 opens the first ventilation hole 63. As a result, the inside of the container body A communicates with the outside through the third ventilation hole 65, the second ventilation hole 64, and the first ventilation hole 63.

The trigger portion 51 includes a main plate member 80 having a front surface that curves concavely toward the rear when viewed from the left and right sides, and a pair of side plate members 81 that stand up from the left and right side edges of the main plate member 80 toward the rear. And has.

At the upper ends of the pair of side plate members 81, a pair of connecting plates 82 extending upward to the side of the injection cylinder portion 11 and sandwiching the injection cylinder portion 11 from the left-right direction are formed. A rotating shaft portion 83 is provided so as to project outward from the pair of connecting plates 82 in the left-right direction. These rotating shaft portions 83 are rotatably supported by bearing portions provided on the upper plate member 84 that covers the upper part of the injection cylinder portion 11.
As a result, the trigger portion 51 can swing in the front-rear direction around the rotation shaft portion 83.

The trigger portion 51 is formed with an opening 51a that penetrates the main plate member 80 in the front-rear direction, and a connecting cylinder 85 is formed so as to extend rearward from the peripheral edge of the opening 51a.
A pair of connecting shafts 86 protruding in the left-right direction toward the inside of the connecting cylinder 85 are formed on a portion of the inner peripheral surface of the connecting cylinder 85 located at the rear. These connecting shafts 86 are inserted into connecting holes formed in the connecting portion 70 of the main piston 52. As a result, the trigger portion 51 and the main piston 52 are connected to each other.

The connecting portion 70 of the main piston 52 is rotatably connected to the connecting shaft 86 around the axis thereof, and is movably connected to the connecting shaft 86 by a predetermined amount in the vertical direction. As a result, the main piston 52 can move back and forth as the trigger portion 51 swings in the front-rear direction.

On the upper surface of the injection cylinder portion 11, the horizontal plate-shaped upper plate member 84 connected to the top wall portion 12d of the outer cylinder 12 in the vertical supply cylinder portion 10 is attached.
On both the left and right sides of the upper plate member 84, the elastic plate portions 54 that are formed in an arc shape that is convex forward when viewed from the left and right directions and that extends to the lower side of the injection cylinder portion 11 are integrally formed. There is. The elastic plate portion 54 is formed in an arc shape concentric with each other when viewed from the left-right direction, and includes a pair of leaf springs arranged in the front-rear direction.

Of the pair of leaf springs, the leaf spring located on the front side is the main leaf spring 54a, and the leaf spring located on the rear side is the sub leaf spring 54b.
The lower ends of the main leaf spring 54a and the sub leaf spring 54b are integrally connected via a curved portion 54c curved in an arc shape. A locking piece 54d is projected downward from the curved portion 54c, and the locking piece 54d is inserted into and engaged with the pocket portion 81a formed in the side plate member 81 of the trigger portion 51 from above. ing.
As a result, the elastic plate portion 54 urges the trigger portion 51 forward via the locking piece 54d and the pocket portion 81a.

The upper end portion of the main plate member 80 of the trigger portion 51 is in contact with the lower end portion of the connection wall 123, which will be described later, from the rear by the urging by the elastic plate portion 54. As a result, the trigger portion 51 is positioned at the most forward swing position.
When the trigger portion 51 is pulled backward from the foremost swing position, the elastic plate portion 54 is elastically deformed so as to move the curved portion 54c rearward via the locking piece 54d. At this time, in the elastic plate portion 54, the sub-leaf spring 54b is elastically deformed more than the main leaf spring 54a.

Even when the trigger portion 51 is pulled backward, the locking piece 54d is engaged with the pocket portion 81a until the trigger portion 51 reaches the rearmost swing position while being pulled out upward from the pocket portion 81a. Maintain a good condition.

Further, in the trigger type liquid ejector 1A of the present embodiment, when the main piston 52 moves from the frontmost position to the rearward position between the main piston 52 and the main cylinder 53, the inside of the inner cylinder 13 is formed. A communication passage 180 is formed in which the inside of the main cylinder 53 is communicated with the inside of the container body A by a route different from the route via the above.

The communication passage 180 will be described in detail.
An annular recess 181 is formed on the outer peripheral surface of the rear end of the piston guide 62. As a result, when the main piston 52 moves rearward from the frontmost position, the inner lip portion 72a formed in the piston main body portion 72 reaches the recessed portion 181 and can be accommodated in the recessed portion 181.
The recessed portion 181 is not limited to the case where it is formed in an annular shape, and may be recessed toward the inside of the piston guide 62. For example, only one recessed portion 181 is formed on the outer peripheral surface of the piston guide 62. Alternatively, a plurality of piston guides 62 may be formed at intervals in the circumferential direction.

In the present embodiment, the recessed portion 181 is formed at a position facing the inner lip portion 72a in the radial direction of the piston guide 62 when the main piston 52 moves to the rearmost position. As a result, when the main piston 52 moves to the rearmost position, the inner lip portion 72a is accommodated in the recessed portion 181.

Since the inner lip portion 72a is housed in the recess portion 181, a slight gap is formed between the inner lip portion 72a and the recess portion 181. As a result, the inside of the main cylinder 53 and the gap between the inner peripheral surface of the piston main body 72 and the outer peripheral surface of the piston guide 62 can communicate with each other through the gap between the inner lip portion 72a and the recessed portion 181. ing.

The rear wall portion 61 of the main cylinder 53 is formed with a plurality of ribs 182 that project forward and extend along the radial direction of the piston guide 62 at intervals in the circumferential direction of the piston guide 62. The inner lip portion 72a comes into contact with the plurality of ribs 182 from the front when the main piston 52 moves to the rearmost position. As a result, the inside of the main cylinder 53 can easily communicate with the gap between the inner lip portion 72a and the recessed portion 181 through the gap between the ribs 182 adjacent to each other in the circumferential direction. The rib 182 may not be formed.

The front end wall of the piston guide 62 is formed with a communication opening 183 that penetrates the front end wall in the front-rear direction and communicates between the inside of the piston body 72 and the inside of the piston guide 62.
In the illustrated example, a plurality of communication openings 183 are formed at intervals in the circumferential direction of the piston guide 62. The communication opening 183 communicates with the gap between the inner peripheral surface of the piston main body 72 and the outer peripheral surface of the piston guide 62, and communicates with the inside of the fitting cylinder 41 through the inside of the piston guide 62.
The form of the communication opening 183 is not limited to the illustrated example, and for example, only one communication opening 183 having the same diameter as the inner diameter of the piston guide 62 may be formed.

In the front portion between the inner peripheral surface of the small diameter portion 12b of the outer cylinder 12 and the outer peripheral surface of the small diameter portion 13b of the inner cylinder 13 in the vertical supply cylinder portion 10, the inside of the fitting cylinder portion 41 and the third communication A connecting passage 184 that communicates with the inside of the pore 65 is formed.

As a result, the inside of the main cylinder 53 and the inside of the container body A are between the inner lip portion 72a and the recessed portion 181 and the gap between the inner peripheral surface of the piston main body portion 72 and the outer peripheral surface of the piston guide 62, and a communication opening. Through the inside of the portion 183, the inside of the piston guide 62, and the inside of the connecting passage 184, communication is possible by a route different from the route passing through the inside cylinder 13.
Therefore, there is a gap between the inner lip portion 72a and the recessed portion 181 and between the inner peripheral surface of the piston main body 72 and the outer peripheral surface of the piston guide 62, inside the communication opening 183, inside the piston guide 62, and the connection passage 184. The inside functions as the communication passage 180.

As shown in FIG. 3, the ejector main body 2 has a storage member 90 extending in the front-rear direction, a storage plunger 91 housed in the storage member 90, and a mounting cylinder 92 mounted on the injection cylinder portion 11. And an actuating member 130 disposed so as to be movable rearward with respect to the storage member 90.

The storage member 90 is arranged above the injection cylinder portion 11 and extends in the front-rear direction. As a result, the storage member 90 is arranged parallel to the injection cylinder portion 11.
The storage member 90 includes a front wall portion 95 and a storage cylinder 96 extending rearward from the front wall portion 95, and is formed in a tubular shape that opens rearward. The front wall portion 95 projects upward and downward from the storage cylinder 96, and is formed longer in the vertical direction than in the horizontal direction when viewed from the front. Hereinafter, the central axis of the storage cylinder 96 is referred to as an axis O2, and the direction along the axis O2 is referred to as an axial direction. In the present embodiment, the axial direction and the front-back direction coincide with each other, but the two directions may be different from each other.

As shown in FIG. 3, the storage cylinder 96 has a front cylinder portion 96a, a tapered cylinder portion 96b, a middle cylinder portion 96c, and a rear cylinder portion 96d. The front cylinder portion 96a extends rearward from the front wall portion 95. The tapered cylinder portion 96b extends radially outward of the storage cylinder 96 from the rear end of the front cylinder portion 96a toward the rear. The middle cylinder portion 96c extends rearward from the rear end of the tapered cylinder portion 96b. The rear cylinder portion 96d extends further rearward from the rear end of the middle cylinder portion 96c. The inner and outer diameters of the front cylinder portion 96a, the middle cylinder portion 96c, and the rear cylinder portion 96d are substantially constant along the front-rear direction. The inner diameter of the middle cylinder portion 96c is larger than the inner diameter of the front cylinder portion 96a, and the inner diameter of the rear cylinder portion 96d is larger than the inner diameter of the middle cylinder portion 96c. The rear cylinder portion 96d is formed with a locking hole 96e that penetrates the rear cylinder portion 96d.

The storage cylinder 96 is arranged on the upper plate member 84 and protrudes rearward from the vertical supply cylinder portion 10. A cap 97 is attached to the rear end of the storage cylinder 96.
The cap 97 includes a cap inner cylinder 97a fitted inside the storage cylinder 96, a locking convex portion 97b protruding outward in the radial direction from the cap inner cylinder 97a, and a rear end opening of the cap inner cylinder 97a. It is provided with an annular spring seat 97c that extends radially inward from the portion. The locking convex portion 97b is located in the locking hole 96e. As a result, the cap 97 is locked to the rear cylinder portion 96d of the storage cylinder 96.

The front wall portion 95 is formed with a communication hole 95b that penetrates the front wall portion 95 in the front-rear direction. The communication hole 95b communicates the inside of the storage cylinder 96 with the ejection hole 4.
Further, in the lower portion of the front end portion of the storage cylinder 96, a supply hole 95a penetrating this portion in the vertical direction is formed. The supply hole 95a communicates the inside of the front cylinder portion 96a with the minute flow path 126 described later.

The storage plunger 91 is movably arranged in the axial direction (front-back direction) along the axis O2, and moves toward one side (rearward) in the axial direction as the liquid is supplied into the storage cylinder 96. The storage plunger 91 includes a rod 110 and an auxiliary piston 111 fitted to the front end portion of the rod 110, and is housed in the storage member 90.
The rod 110 is formed in a cylindrical shape that opens rearward, and a diameter-expanding guide portion 110a that projects toward the inner peripheral surface of the storage cylinder 96 is formed on the outer peripheral surface. The rear end opening edge of the rod 110 functions as a locked portion 110b that is locked from the front to the annular wall (locking portion) 137 of the operating member 130 described later.
The auxiliary piston 111 is formed in a tapered shape whose diameter gradually increases from the central portion in the front-rear direction toward the front and rear, and both ends in the front-rear direction are closely slid with respect to the inner peripheral surface of the storage cylinder 96. The lip portion 111a is in contact with the lip portion 111a.

An urging member 160 for generating a forward urging force on the storage plunger 91 is provided between the storage plunger 91 and the cap 97. The urging member 160 is, for example, a metal coil spring, which is arranged in a state of extending in the front-rear direction and being compressed in the front-rear direction.
The urging member 160 is arranged so as to surround the rear end portion of the rod 110. The rear end portion of the urging member 160 abuts on the spring seat 97c of the cap 97 from the front, and the front end portion of the urging member 160 abuts on the sliding portion 151 described later from the rear.

The auxiliary piston 111 is formed with a convex portion 113 that protrudes forward and enters the communication hole 95b formed in the front wall portion 95 of the storage member 90 and directly closes the communication hole 95b.
As a result, the storage plunger 91 closes the communication hole 95b so as to be openable. In particular, the convex portion 113 closes the communication hole 95b in a sealed state by the urging from the urging member 160.

The position of the storage plunger 91 when the convex portion 113 closes the communication hole 95b is set as the most advanced position. When the storage plunger 91 is arranged at the most advanced position, almost no liquid is stored in the storage member 90, and the communication between the storage cylinder 96 and the communication hole 95b is cut off.
On the other hand, the position of the storage plunger 91 when the locked portion 110b of the rod 110 is in contact with the annular wall 137 of the operating member 130 described later from the front due to the backward movement of the storage plunger 91 is finally set. It is the position just before the retreat. Further, the position of the storage plunger 91 when the storage plunger 91 moves further backward beyond the position immediately before the last retreat and the operating member 130 moves rearward with respect to the storage member 90 is defined as the last retreat position (FIG. 5). ..
When the storage plunger 91 has reached the last retracted position, the maximum amount of liquid is stored in the storage cylinder 96.

An outer cylinder 98 projecting forward is formed on the front wall portion 95 of the storage member 90. A nozzle portion 3 is attached to the outer cylinder 98.
The front wall portion 95 is integrally formed with the mounting cylinder 92. The mounting cylinder 92 is fitted to the injection cylinder portion 11 from the front.

A vertical hole extending in the vertical direction and communicating the inside of the storage member 90 and the inside of the injection cylinder portion 11 is formed between the front wall portion 95 and the connection wall 123 described later, and the upper end of the vertical hole is formed. The opening is the supply hole 95a described above. In the vertical hole, the plug 125 is inserted over almost the entire length in the vertical direction of the vertical hole. In the vertical hole, the plug body 125 has the supply hole 95a open and the lower end opening tightly closed, and the plug body 125 has the inside of the injection cylinder portion 11 and the inside of the storage cylinder 96 between the inner peripheral surface of the vertical hole. The microchannel 126 that communicates with the above is formed. Due to this plug body 125, the space volume of the vertical hole is further reduced.
From the above, the inside of the injection cylinder portion 11 and the inside of the storage cylinder 96 communicate with each other through the minute flow path 126 and the supply hole 95a. Since the path from the injection cylinder portion 11 to the supply hole 95a is the minute flow path 126, it is possible to suppress an increase in the space volume of this path.

An insertion portion 201 extending rearward is formed in a portion of the storage member 90 that faces the front end opening of the injection cylinder portion 11 in the front-rear direction. The insertion portion 201 is inserted into the injection cylinder portion 11 over almost the entire length in the front-rear direction of the injection cylinder portion 11. The insertion portion 201 is inserted into the injection cylinder portion 11 so as to secure a slight gap S3 in the upper portion of the internal space of the injection cylinder portion 11. Thereby, the volume of the space in the injection cylinder portion 11 can be further reduced.
Further, a connecting wall 123 is projected downward from the connecting portion between the front wall portion 95 and the mounting cylinder 92. Then, the lower end portion of the connection wall 123 abuts from the front on the upper end portion of the main plate member 80 of the trigger portion 51, thereby positioning the trigger portion 51 at the foremost swing position.

In this embodiment, the inside of the injection cylinder portion 11 and the ejection hole 4 communicate with each other through the micro flow path 126, the supply hole 95a, the inside of the storage cylinder 96, and the communication hole 95b. Therefore, the communication hole 95b communicates the inside of the storage cylinder 96 with the ejection hole 4, but in addition, the inside of the injection cylinder portion 11 communicates with the ejection hole 4.

As shown in FIGS. 1 to 3, the operating member 130 is integrally formed with the insertion portion 131 inserted into the storage cylinder 96 from the rear and the insertion portion 131, and is formed forward outside the storage member 90. It includes a connecting portion 132 extending toward the connecting portion 132, and a regulating portion 133 that is integrally formed with the connecting portion 132 and is arranged in front of the trigger portion 51 to regulate the swing of the trigger portion 51.

The insertion portion 131 is inserted into the inside of the storage cylinder 96 from the rear through the inside of the spring seat 97c in the cap 97, and extends in the front-rear direction.
The insertion portion 131 is arranged inside the spring seat 97c, and extends further forward from the columnar first insertion portion 135 and the first insertion portion 135 guided so as to be movable rearward by the spring seat 97c, and is the first. It is formed in a two-stage columnar shape provided with a columnar second insertion section 136 having a diameter reduced from that of the insertion section 135.

At the connecting portion between the first insertion portion 135 and the second insertion portion 136, a stepped portion having an annular wall 137 facing forward is formed. The annular wall 137 is arranged behind the locked portion 110b of the rod 110 of the storage plunger 91. The second insertion portion 136 is inserted into the rod 110 of the storage plunger 91 from the rear. As a result, the storage plunger 91 can be moved backward in the storage cylinder 96 while being guided by the second insertion portion 136.
When the storage plunger 91 moves backward from the most advanced position and reaches the position immediately before the last retreat, the locked portion 110b of the rod 110 is locked to the annular wall 137 from the front.

(Obi)
Here, the ejector main body 2 of the present embodiment includes a plurality of strips 114 and a sliding member 150.
Each band 114 is located between the first end 114a connected to the storage plunger 91, the second end 114c connected to the storage cylinder 96, and the first end 114a and the second end 114c. It has an intermediate portion 114b that receives the urging force of the urging member 160. The first end portion 114a is connected to the rear end portion (locked portion 110b) of the rod 110 and extends outward in the radial direction of the rod 110. The intermediate portion 114b is folded back so as to open toward one side (rear) in the axial direction along the axis O2, and is curved forward in a U-shape in a vertical cross-sectional view.

As shown in FIG. 4, in the present embodiment, the four strips 114 are arranged at intervals in the circumferential direction of the rod 110. The four strips 114 are arranged in a cross shape when viewed from the front. Each band 114 of the present embodiment is formed in a band shape having a rectangular cross section, but the shape of the band 114 can be appropriately changed. For example, the band 114 may be formed in a linear shape having a small width.
As shown in FIG. 3, the second end portion 114c of each band 114 is connected to the annular body 115 formed in an annular shape when viewed from the direction along the axis O2. The second end portions 114c are connected to each other via the annular body 115. The annular body 115 is located in the rear cylinder portion 96d, and is sandwiched in the front-rear direction between the rear end surface of the middle cylinder portion 96c and the front end surface of the cap inner cylinder 97a. As a result, the movement of the annular body 115 with respect to the storage cylinder 96 in the front-rear direction is restricted, and each second end portion 114c is connected to the storage cylinder 96.

The sliding member 150 has a sliding portion 151 and a holding portion 152. The sliding portion 151 is formed in an annular shape when viewed from the front. The front end surface of the sliding portion 151 is formed in a curved surface shape that is convex toward the front. The front end surface of the urging member 160 is in contact with the rear end surface of the sliding portion 151. The holding portion 152 is formed in a cylindrical shape extending rearward from the outer peripheral edge of the annular sliding portion 151. The holding portion 152 surrounds the front end portion of the urging member 160 from the outside thereof, and holds the urging member 160.

The sliding portion 151 is in contact with the intermediate portion 114b of each band 114. The sliding portion 151 is formed in the radial direction of the rod 110 by the portion of each band 114 between the first end portion 114a and the intermediate portion 114b and the portion between the second end portion 114c and the intermediate portion 114b. It is sandwiched between. The sliding portion 151 is pressed from behind against the intermediate portion 114b by the forward urging force of the urging member 160. Therefore, tension is applied to each band 114 by the urging member 160, and the forward urging force acts on the storage plunger 91 by transmitting this tension. That is, when the intermediate portion 114b receives the urging force of the urging member 160, the band 114 transmits the forward urging force of the urging member 160 to the storage plunger 91.

(Action of trigger type liquid ejector)
Next, a case where the trigger type liquid ejector 1A configured as described above is used will be described.
It is assumed that each part of the trigger type liquid ejector 1A is filled with the liquid by a plurality of operations of the trigger part 51, and the liquid can be sucked up from the vertical supply cylinder part 10.

When the trigger portion 51 is pulled backward against the urging force of the elastic plate portion 54, the main piston 52 moves backward with the backward movement of the trigger portion 51, so that the liquid in the main cylinder 53 is passed through the first through hole. It can be introduced into the inner cylinder 13 of the vertical supply cylinder portion 10 through the 66 and the second through hole 67. Then, the liquid introduced into the inner cylinder 13 pushes down the first check valve 36 to close the valve and pushes up the second check valve 30 to open the valve, so that the liquid is opened through the inner ejection hole 17 and the outer ejection hole 16. A liquid can be introduced into the injection tube portion 11.

As a result, the internal pressure of the injection cylinder portion 11 rises, so that the liquid in the injection cylinder portion 11 can be introduced into the storage cylinder 96 through the minute flow path 126 and the supply hole 95a. Then, as shown in FIG. 5, the storage plunger 91 can be moved rearward from the most advanced position against the urging force of the urging member 160, and the convex portion 113 is separated from the communication hole 95b to separate the communication hole. 95b can be opened.

Therefore, the liquid can be guided to the ejection hole 4 through the communication hole 95b, and the liquid can be ejected from the ejection hole 4 toward the front, and at the same time, the storage plunger 91 can be moved toward the rear.
In this way, each time the trigger portion 51 is pulled backward, the liquid can be ejected from the ejection hole 4, and the storage plunger 91 is moved rearward to store the liquid in the storage cylinder 96 (filling). can do.

Then, when the operation of pulling the trigger portion 51 is stopped and the trigger portion 51 is released, the trigger portion 51 is urged forward by the elastic restoring force of the elastic plate portion 54 and returns to the original position. The main piston 52 moves forward. Therefore, a negative pressure is generated in the main cylinder 53, and the liquid in the container body A can be sucked up to the vertical supply cylinder portion 10 through the pipe 15.
Then, the newly sucked liquid pushes up the first check valve 36 to open the valve and is introduced into the main cylinder 53. This makes it possible to prepare for the next injection. The second check valve 30 is closed.

At this time, although the supply of the liquid from the injection cylinder portion 11 into the storage cylinder 96 is stopped, the storage plunger 91 starts to move forward toward the most advanced position due to the elastic restoring force of the urging member 160. As a result, the liquid accumulated in the storage cylinder 96 can be guided to the ejection hole 4 through the communication hole 95b, and the liquid can be ejected forward through the ejection hole 4.
In this way, the liquid can be ejected not only when the trigger portion 51 is pulled backward, but also when the trigger portion 51 is not operated, and the liquid can be continuously injected.

In particular, the storage cylinder 96 is formed with a communication hole 95b communicating with the ejection hole 4 and a supply hole 95a communicating with the inside of the injection cylinder portion 11, and the storage plunger 91 directly closes the communication hole 95b. Therefore, the space volume of the path from the injection cylinder portion 11 to the storage cylinder 96 can be easily reduced. Therefore, when the trigger portion 51 is operated, the liquid can be immediately introduced into the storage cylinder 96 from the injection cylinder portion 11, the pressure in the storage cylinder 96 is rapidly increased, and the storage plunger 91 is immediately moved backward. Easy to make. Therefore, it is possible to quickly inject the liquid while suppressing the number of priming. Therefore, it is easy to use and has excellent operability.

Further, since the storage plunger 91 directly closes the communication hole 95b, the liquid is not injected unless the internal pressure of the storage cylinder 96 exceeds a predetermined value. Therefore, the liquid can be injected at an appropriate pressure (injection pressure) without separately providing a high-pressure valve or the like, and the configuration can be easily simplified. Moreover, since the pressure can be accumulated by moving the storage plunger 91 urged forward by the urging member 160 backward, it is possible to inject the liquid in a state where the pressure is further applied to the liquid.
In addition, it is possible to effectively suppress liquid leakage from the ejection hole 4 when not in use.

When the storage plunger 91 is advanced, the storage plunger 91 moves to the most advanced position unless the operation of pulling the trigger unit 51 is performed again, but the operation of pulling the trigger unit 51 may be repeated before that.
In this case, the storage plunger 91 gradually moves backward as a whole while repeating backward and forward movements. As a result, the liquid can be gradually stored in the storage cylinder 96.
Then, by moving the storage plunger 91 to, for example, the position immediately before the last retreat, the liquid can be continuously injected for a long time until the storage plunger 91 moves from the position immediately before the last retreat to the most advanced position.

By the way, when the storage plunger 91 moves backward, the first end portion 114a of the band 114 approaches the second end portion 114c following the movement. At this time, since the intermediate portion 114b is subjected to the urging force of the urging member 160, the band 114 is deformed so as to be folded in a state where the tension caused by the urging force is applied. Then, in conjunction with the deformation of the band 114, the sliding portion 151 slides on the surface of the band 114. That is, the band 114 and the sliding portion 151 function like a moving pulley in which the sliding portion 151 moves in the front-rear direction due to the deformation of the band 114. As a result, even when the stroke amount toward one side (rear) in the axial direction of the storage plunger 91 is increased and the volume of the liquid that can be stored in the storage cylinder 96 is increased, the storage plunger 91 in the storage cylinder 96 is increased. It is possible to make the space behind the cylinder smaller, and it is possible to suppress the bulkiness of the ejector main body 2 in the front-rear direction.

Further, the amount of compression deformation of the urging member 160 is about half of the amount of backward movement of the storage plunger 91. Therefore, due to the principle of work in the moving pulley, about half of the elastic force generated by the urging member 160 acts as a forward urging force on the storage plunger 91. Therefore, compared to the case where the moving pulley is not used, for example, when a coil spring is used as the urging member 160, the restoring force can be doubled, the effective number of turns can be reduced, and the adhesion height can be reduced. can. The smaller the contact height of the coil spring as the urging member 160, the larger the stroke amount of the storage plunger 91 can be while suppressing the bulkiness of the ejector main body 2.

Further, for example, when the storage plunger 91 moves to the position immediately before the last retreat by continuously repeating the operation of pulling the trigger portion 51, as shown in FIG. 5, the locked portion 110b of the rod 110 is moved to the operating member 130. Locks from the front to the annular wall 137 of the insertion portion 131 in the above. Therefore, when the storage plunger 91 is further moved backward by the further operation of the trigger portion 51, the entire operating member 130 moves backward with respect to the storage member 90. As a result, the restricting portion 133 arranged in front of the trigger portion 51 can be brought into contact with or close to the trigger portion 51 swung backward from the front, and the trigger portion 51 cannot be returned to the front. be able to.

Therefore, it is possible to keep the storage plunger 91 in the rearmost retracted position and mechanically prevent it from moving further backward, and it is possible to prevent the storage cylinder 96 from being filled with more liquid than the allowable amount. .. As a result, it is possible to prevent the pressure in the storage cylinder 96 from rising excessively, and it is possible to prevent problems such as breakage from occurring. Therefore, it is easy to use and continuous liquid injection can be performed with peace of mind.
In particular, since the trigger portion 51 does not return to the front, it is easy and surely easy to grasp it tactilely and visually. Therefore, it is easy to prevent an erroneous operation such as forcibly performing a further operation of the trigger portion 51.

Further, since the storage cylinder 96 is arranged above the injection cylinder portion 11 and is arranged in parallel with the injection cylinder portion 11, when the storage cylinder 96 is arranged so as to be connected to the injection cylinder portion 11 in the front-rear direction. In comparison, it is easy to secure the stroke of the storage plunger 91 and perform continuous injection for a long time while shortening the total length of the trigger type liquid ejector 1A to reduce the size.
Further, since the space volume in the injection cylinder portion 11 and the vertical hole is further reduced by the insertion portion 201 and the plug body 125, the pressure in the storage cylinder 96 can be increased more quickly.
Therefore, the liquid can be injected at a high injection pressure, and the storage plunger 91 can be moved backward more smoothly.

Further, the intermediate portion 114b that receives the urging force of the urging member 160 is folded back so as to open toward the rear (one side in the axial direction). In this way, by receiving the urging force at the folded portion of the band 114, this urging force can be more reliably received and transmitted to the storage plunger 91.
Further, the length between the intermediate portion 114b and the first end portion 114a and the length between the intermediate portion 114b and the second end portion 114c when the storage plunger 91 moves in the front-rear direction (axial direction). The band 114 is deformed so as to change. Therefore, for example, the band 114 is prevented from loosening with the movement of the storage plunger 91, and the storage plunger 91 can be moved more smoothly.

(Second Embodiment)
Hereinafter, the trigger type liquid ejector 1B according to the second embodiment will be described.
As shown in FIG. 6, the trigger type liquid ejector 1B of the present embodiment is mounted on a container body A for accommodating a liquid, and has an ejector main body 2 having a vertical supply cylinder portion 210 for sucking the liquid, and a liquid forward. An ejection hole 4 for ejecting toward the surface is formed, and the nozzle portion 3 mounted on the ejector main body 2 is provided.
Unless otherwise specified, each configuration of the trigger type liquid ejector 1B is a molded product using a synthetic resin.

In the present embodiment, the central axis of the vertical supply cylinder 210 is referred to as the axis O1, the container A side along the axis O1 is referred to as the lower side, the opposite side thereof is referred to as the upper side, and the direction along the axis O1 is referred to as the vertical direction. Further, in a plan view seen from the vertical direction, one direction orthogonal to the axis O1 is referred to as a front-rear direction, and a direction orthogonal to both the vertical direction and the front-rear direction is referred to as a left-right direction.

The ejector main body 2 has a vertical supply cylinder portion 210 extending in the vertical direction and an injection cylinder portion 211 extending in the front-rear direction from the vertical supply cylinder portion 210 and communicating with the inside of the vertical supply cylinder portion 210 inside. And have. Further, the ejector main body 2 includes a connecting cylinder portion 230, a blocking plug 231, a first check valve (ball valve) 236, a cylinder cylinder portion 240, a storage member 290, a second check valve (storage valve) 302, and storage. It is equipped with a plunger 310.
Of the front-rear directions, the direction in which the injection cylinder portion 211 extends from the vertical supply cylinder portion 210 is referred to as the front, and the opposite direction is referred to as the rear.

As shown in FIG. 7, the vertical supply cylinder portion 210 includes a ridged outer cylinder 212 and an inner cylinder 213 fitted in the outer cylinder 212.
The outer cylinder 212 has a large diameter portion 212a, a small diameter portion 212b that is arranged above the large diameter portion 212a and has a smaller diameter than the large diameter portion 212a, and an upper end portion of the large diameter portion 212a and a lower end portion of the small diameter portion 212b. It is provided with a flange portion 212c for connecting the above, and is formed in a two-stage tubular shape whose diameter is reduced from the lower side to the upper side. The upper opening of the small diameter portion 212b is closed by the top wall portion 212d.

The top wall portion 212d is formed with a seal cylinder portion 212e extending downward and a regulation protrusion 212f. Both the seal cylinder portion 212e and the regulation protrusion 212f are arranged coaxially with the axis O1. The seal cylinder portion 212e is formed so as to surround the regulation protrusion 212f from the outside in the radial direction, and extends downward with a length similar to that of the regulation protrusion 212f.

The inner cylinder 213 has a large diameter portion 213a, a small diameter portion 213b arranged above the large diameter portion 213a and having a smaller diameter than the large diameter portion 213a, and an upper end portion of the large diameter portion 213a and a lower end portion of the small diameter portion 213b. The flange portion 213c and the like are provided, and the diameter is reduced from the lower side to the upper side to form a two-stage cylinder.

A seal cylinder portion 212e of the outer cylinder 212 is fitted in the upper end portion of the small diameter portion 213b of the inner cylinder 213. Further, in the small diameter portion 213b, the upper portion of the pipe 215 which is arranged in the container body A and whose lower end opening is located at the bottom portion of the container body A (not shown) is fitted. The flange portion 213c of the inner cylinder 213 is located below the flange portion 212c of the outer cylinder 212 with a gap S1 secured between the flange portion 213c of the outer cylinder 212 and the flange portion 212c of the outer cylinder 212.

In the large-diameter portion 213a of the inner cylinder 213, an annular flange portion 213d protruding outward in the radial direction is formed in a portion protruding downward from the large-diameter portion 212a of the outer cylinder 212. The flange portion 213d is arranged in the upper end portion of the mounting cap 214 mounted (for example, screwed) on the mouth portion A1 of the container body A, and is rotatably locked to the upper end portion of the mounting cap 214 around its axis. ..
The flange portion 213d is sandwiched in the vertical direction by the mounting cap 214 and the upper end opening edge of the mouth portion A1 of the container body A.
The axis O1 of the vertical supply cylinder portion 210 composed of the outer cylinder 212 and the inner cylinder 213 is eccentric to the rear with respect to the container shaft of the container body A.

The portion of the inner peripheral surface of the inner cylinder 213 located below the seal cylinder portion 212e and above the upper end of the pipe 215 is formed in a cylindrical shape having a diameter smaller than that of the inner cylinder 213. 1 A support cylinder portion 235 that supports the check valve 236 from below is arranged.
The support cylinder portion 235 is arranged coaxially with the axis O1, and its lower end portion projects outward in the radial direction and is integrally formed on the inner peripheral surface of the inner cylinder 213. The upper end opening end of the support cylinder portion 235 is a seating surface on which the first check valve 236 is seated, and the cross section is formed in a tapered shape.

The first check valve 236 is arranged inside the inner cylinder 213 in a state where it is seated on the seating surface of the support cylinder portion 235 so as to be detachable. The first check valve 236 communicates with and shuts off the space located above the support cylinder portion 235 and the space located below the support cylinder portion 235 in the inner cylinder 213.

The connection cylinder portion 230 extends forward from the upper end portion of the vertical supply cylinder portion 210. Specifically, the rear end portion of the connection cylinder portion 230 is connected to the front side of the upper end portion of the small diameter portion 212b of the outer cylinder 212. The rear end opening of the connection cylinder portion 230 is opened in the seal cylinder portion 212e. As a result, the connection cylinder portion 230 communicates with the inside of the vertical supply cylinder portion 210.
The front end portion of the connection cylinder portion 230 is provided with the blocking plug 231 that fits tightly into the connection cylinder portion 230 and closes the front end opening of the connection cylinder portion 230.

The cylinder portion 240 is integrally formed in the outer cylinder 212 at a portion located below the connecting cylinder portion 230. The cylinder portion 240 protrudes forward from the outer cylinder 212 and opens toward the front. The cylinder portion 240 is arranged between the connection cylinder portion 230 and the flange portion 212c, has a partition wall W1 common to the connection cylinder portion 230, and has a partition wall W2 common to the flange portion 212c.

As shown in FIG. 8, above the connecting cylinder portion 230, the liquid that has passed through the inside of the vertical supply cylinder portion 210 and the inside of the connecting cylinder portion 230 due to the backward swing (movement) of the trigger portion 51 described later is inside. A storage member 290 to be supplied to the storage member 290 is arranged.

The storage member 290 has a tubular storage cylinder 293 extending in the front-rear direction. The storage cylinder 293 is arranged in parallel with the connection cylinder portion 230 and the cylinder cylinder portion 240. In the illustrated example, the storage cylinder 293 is formed so as to project rearward from the vertical supply cylinder portion 210. The central axis of the storage cylinder 293 extends along the front-rear direction. Hereinafter, the central axis of the storage cylinder 293 is referred to as an axis O2, and the direction along the axis O2 is referred to as an axial direction. In the present embodiment, the axial direction and the front-back direction coincide with each other, but the two directions may be different from each other.

The storage cylinder 293 is formed with a supply hole 291 that communicates with the connecting cylinder portion 230. As a result, the liquid that has passed through the vertical supply cylinder portion 210 and the connection cylinder portion 230 is supplied into the storage cylinder 293 through the supply hole 291.
The connection cylinder portion 230 and the storage cylinder 293 are arranged in parallel in the vertical direction and have a common partition wall W3. In the illustrated example, the storage cylinder 293 is also arranged on the vertical supply cylinder portion 210. Therefore, the vertical supply cylinder portion 210 and the storage cylinder portion 293 are provided with a common partition wall W4 formed by the top wall portion 212d.

The storage member 290 includes a front wall portion 292 arranged above the front end portion of the connection cylinder portion 230, and a storage cylinder 293 extending rearward from the front wall portion 292, and is a cylinder opened rearward as a whole. It is formed in a shape.
The front wall portion 292 is formed with a mounting recess 294 and a communication hole 295.
The mounting recess 294 is formed on the rear end surface of the front wall portion 292 in an annular shape coaxial with the axis O2 of the storage cylinder 293. The communication hole 295 is formed so as to penetrate the front wall portion 292 in the front-rear direction. The communication hole 295 is arranged inside the mounting recess 294 when the front wall portion 292 is viewed from the front-rear direction, and penetrates the front wall portion 292 in the front-rear direction.

The storage cylinder 293 has a front cylinder portion 296 connected to the front wall portion 292, and a rear cylinder portion 297 having a larger outer diameter and inner diameter than the front cylinder portion 296 and located behind the front cylinder portion 296. It is provided with a stepped portion 298 that connects the front cylinder portion 296 and the rear cylinder portion 297 in the front-rear direction, and is formed in a multi-step cylinder shape that gradually expands in diameter from the front to the rear.

The diameter of the step portion 298 is gradually increased from the front to the rear. A lip member 299 is attached to the inside of the step portion 298. The lip member 299 has a lip portion 299a that abuts on the outer peripheral surface of the plunger cylinder 321 of the storage plunger 310.
The rear cylinder portion 297 is arranged behind the vertical supply cylinder portion 210. A plurality of locking convex portions 297a are formed on the rear end portion side of the rear cylinder portion 297 at intervals in the circumferential direction of the rear cylinder portion 297. The locking convex portion 297a projects radially outward from the rear cylinder portion 297.

The front cylinder portion 296 constitutes the partition wall W3 described above. The rear end portion of the front cylinder portion 296 and the step portion 298 constitute the partition wall W4 described above.
In addition to the supply hole 291, the storage cylinder 293 is further formed with a connecting groove 340 and a recovery hole 341.

The supply hole 291 is formed in the lower portion of the front end portion of the front cylinder portion 296 and penetrates the partition wall W3 in the vertical direction. The connecting groove 340 is formed on the inner peripheral surface of the rear end portion of the front cylinder portion 296. The connecting groove 340 extends in the front-rear direction and opens rearward. In the illustrated example, a plurality of connecting grooves 340 are formed at intervals around the axis O2.
The recovery hole 341 is formed in the stepped portion 298 and penetrates the partition wall W4 (top wall portion 212d) in the vertical direction. The lower end of the recovery hole 341 is open to the inside of the seal cylinder portion 212e. In this way, the recovery hole 341 is arranged directly above the vertical supply cylinder portion 210.

As shown in FIG. 7, the vertical supply cylinder portion 210 is formed with a collection passage 342 that communicates with the collection hole 341 and vertically traverses the vertical supply cylinder portion 210. The recovery passage 342 is formed in a vertical groove shape on the outer peripheral surface of the inner cylinder 213, penetrates the small diameter portion 213b in the vertical direction, and communicates with the large diameter portion 213a. As a result, the recovery passage 342 communicates the recovery hole 341 with the inside of the container body A.

As shown in FIG. 8, a valve body 300 in which the second check valve 302 is formed is arranged in the storage cylinder 293.
The second check valve 302 allows the liquid to be supplied from the inside of the connection cylinder portion 230 through the supply hole 291 into the storage cylinder 293, and from the inside of the storage cylinder 293 to the inside of the connection cylinder portion 230 through the supply hole 291. It is said to be a check valve that regulates the outflow of liquid. That is, the second check valve 302 allows communication between the ejection hole 4 and the inside of the vertical supply cylinder portion 210 when the pressure is applied in the main cylinder 253, which will be described later, and the ejection hole 4 is allowed when the pressure is reduced in the main cylinder 253. It is a check valve that shuts off communication between the vertical supply cylinder and the inside of the vertical supply cylinder 210.

The valve body 300 includes a valve base 301 and a second check valve 302.
The valve base 301 is formed in an annular shape coaxial with the axis O2, and is arranged on the rear end surface side of the front wall portion 292. The valve base 301 is provided with a mounting protrusion 303 that is projected forward and is mounted in the mounting recess 294 by entering the mounting recess 294 from the rear. As a result, the entire valve body 300 is integrally combined with the front wall portion 292.

The second check valve 302 is formed in an annular shape so as to project rearward from the outer peripheral edge portion of the valve base portion 301. The second check valve 302 is elastically deformable in the radial direction of the storage cylinder 293, and the rear end portion having a free end is seated so as to be detachable from the inner peripheral surface of the storage cylinder 293. The rear end of the second check valve 302 is located behind the supply hole 291. As a result, the second check valve 302 closes the supply hole 291 from the inside of the storage cylinder 293 so as to be openable.

The storage cylinder 293 is movably arranged in the axial direction (front-back direction) along the axis O2, and moves toward one side (rearward) in the axial direction as the liquid is supplied into the storage cylinder 293. The storage plunger 310 is housed.
The storage plunger 310 includes an auxiliary piston 320 that slides in the storage cylinder 293 in the front-rear direction, and a rod 330 fitted inside the auxiliary piston 320. The auxiliary piston 320 and the rod 330 are formed in a cylindrical shape extending in the front-rear direction, and are arranged coaxially with the axis O2.

The auxiliary piston 320 includes, for example, a plunger cylinder 321 formed of a material softer than the rod 330 and extending in the front-rear direction, and a closing wall 322 for closing the front end opening of the plunger cylinder 321.
The plunger cylinder 321 is formed in a multi-stage tubular shape whose diameter gradually increases from the front to the rear. At the front end of the plunger cylinder 321, a lip portion 323 is formed over the entire circumference of the plunger cylinder 321 in the circumferential direction.

The lip portions 323 are arranged at intervals in the front-rear direction, and slide closely on the inner peripheral surface of the storage cylinder 293 in the front-rear direction.
Specifically, the lip portion 323 slides on the inner peripheral surface of the front cylinder portion 296. The lip portion 323 is in close contact with the inner peripheral surface of the front cylinder portion 296. As a result, a sealing property is ensured between the lip portion 323 and the inner peripheral surface of the front cylinder portion 296.

The closed wall 322 is seated so that the front end surface can be separated from the rear end surface of the valve base 301. As a result, the closing wall 322 closes the communication hole 295 so as to be openable.
In particular, the closing wall 322 is urged forward by the elastic restoring force (spring force) of the urging member 360 described later, and is strongly pressed from the rear against the rear end surface of the valve base 301. As a result, the closing wall 322 seals the communication hole 295 and opens the valve when the entire storage plunger 310 moves backward against the urging member 360 to open the communication hole 295. Therefore, the closing wall 322 can pressurize the liquid in the storage cylinder 293 until the storage plunger 310 moves backward, and when the pressure of the liquid reaches a predetermined value, that is, the storage plunger 310 is attached to the urging member 360. It opens when it moves backward against it, and functions as a pressure accumulator valve that supplies the pressurized liquid to the ejection hole 4 side.

The closing wall 322 of the present embodiment is arranged on the ejection hole 4 side of the second check valve 302, and has an operating pressure (valve opening pressure) corresponding to the elastic restoring force (spring force) of the urging member 360. Open the valve. The working pressure of the closing wall 322 is higher than the working pressure when the second check valve 302 opens.

A convex portion 325 and a concave groove 326 are formed on the front end surface of the closed wall 322. The convex portion 325 protrudes forward from the closing wall 322 and enters the inside of the annular valve base 301 from the rear. The groove 326 extends radially outward of the storage plunger 310 and opens outward in the radial direction.
When the front end surface of the closing wall 322 is seated (contacted) with the rear end surface of the valve base 301, the communication between the concave groove 326 and the communication hole 295 is blocked.

A cap 350 is attached to the rear end of the storage cylinder 293 described above.
The cap 350 includes a cap cylinder 351 arranged coaxially with the axis O2 and fitted to the outside of the rear cylinder portion 297 of the storage cylinder 293, and a spring seat 352 that closes the rear opening of the cap cylinder 351. ..
A plurality of locking holes 351a penetrating the cap cylinder 351 are formed in the cap cylinder 351 at intervals in the circumferential direction of the cap cylinder 351. Inside the locking hole 351a, a locking convex portion 297a formed in the rear cylinder portion 297 is locked. As a result, the cap 350 is combined with the storage cylinder 293 in a state where it is prevented from coming off backward.
An air hole 352a that communicates the inside and the outside of the storage cylinder 293 is formed in the central portion of the spring seat 352.

An urging member 360 that generates a forward urging force on the storage plunger 310 is provided between the storage plunger 310 and the cap 350. The urging member 360 is, for example, a metal coil spring, which is arranged in a state of extending in the front-rear direction and being compressed in the front-rear direction.
The urging member 360 is arranged so as to surround the rear end portion of the rod 330. The rear end portion of the urging member 360 abuts on the spring seat 352 of the cap 350 from the front, and the front end portion of the urging member 360 abuts on the sliding portion 151 from the rear.

The position of the storage plunger 310 when the closing wall 322 closes the communication hole 295 is set as the most advanced position. When the storage plunger 310 is arranged in the most advanced position, the storage cylinder 293 contains almost no liquid and the communication hole 295 is blocked.
On the other hand, as shown in FIG. 9, the position of the storage plunger 310 when the lip portion 323 is located in the connecting groove 340 due to the backward movement of the storage plunger 310 is set as the last retracted position. When the storage plunger 310 is located in the rearmost retracted position, the liquid is maximally contained in the storage cylinder 293.

As shown in FIG. 8, the injection cylinder portion 211 extends forward from the front wall portion 292 of the storage cylinder 293, and guides the liquid in the vertical supply cylinder portion 210 to the ejection hole 4. The injection cylinder portion 211 is arranged so that the central axis is located below the axis O2 of the storage cylinder 293. The inside of the injection cylinder portion 211 communicates with the inside of the vertical supply cylinder portion 210 through the communication hole 295, the storage cylinder 293, the supply hole 291 and the connection cylinder portion 230.

As shown in FIG. 7, the ejector main body 2 extends downward from the injection cylinder portion 211, and is arranged in front of the vertical supply cylinder portion 210 so as to be swingable (movable) backward in a forward urged state. The trigger portion 51, the main piston 252 that moves in the front-rear direction in conjunction with the swing of the trigger portion 51, the main cylinder 253 that pressurizes and depressurizes the inside as the main piston 252 moves, and the trigger portion 51 forward. Further includes an elastic plate portion 54 that urges the vehicle, and a cover body 55 that covers the entire vertical supply cylinder portion 210, injection cylinder portion 211, and storage cylinder 293 from at least upward and from the left and right directions.

The trigger portion 51, the main piston 252, the main cylinder 253, and the elastic plate portion 54 described above swing the trigger portion 51 rearward to supply the liquid from the vertical supply cylinder portion 210 through the injection cylinder portion 211 to the ejection hole 4 side. It constitutes a trigger mechanism 250 to be distributed to.

The main cylinder 253 is provided with an outer cylinder portion 260 that opens toward the front, a rear wall portion 261 that closes the rear opening of the outer cylinder portion 260, and a rear wall portion 261 that projects forward from the central portion. It is provided with a ridged cylindrical piston guide 262 with a closed front end. The inside of the main cylinder 253 communicates with the inside of the vertical supply cylinder portion 210 through the inside of the communication cylinder portion 263. A block plug 231 is integrally formed on the main cylinder 253.

The outer cylinder portion 260 is fitted inside the cylinder portion 240. The inner peripheral surface of the cylinder portion 240 and the outer peripheral surface of the outer cylinder portion 260 are in close contact with each other at both ends in the front-rear direction. On the other hand, an annular gap S2 is secured in the intermediate portion between the inner peripheral surface of the cylinder portion 240 and the outer peripheral surface of the outer cylinder portion 260, which is located between both ends in the front-rear direction. ..

The outer cylinder portion 260 is formed with a first ventilation hole 264 for communicating the inside of the outer cylinder portion 260 with the gap S2. The flange portion 212c of the outer cylinder 212 communicates the gap S2 with the gap S1 defined between the flange portion 212c of the outer cylinder 212 and the flange portion 213c of the inner cylinder 213. Is formed.
Further, the flange portion 213c of the inner cylinder 213 is formed with a third ventilation hole 266 for communicating the gap S1 with the large diameter portion 213a of the inner cylinder 213 and the inside of the mounting cap 214.

The communication cylinder portion 263 projects rearward from the main cylinder 253. Specifically, the communication cylinder portion 263 is formed in a portion of the rear wall portion 261 of the main cylinder 253 located above the piston guide 262, and the outer cylinder 212 and the inner cylinder 213 are integrally inserted. At this time, the communication cylinder portion 263 is tightly fitted in the first through hole 267 formed in the outer cylinder 212, and the second through hole formed in the inner cylinder 213 through the first through hole 267. It is tightly fitted within 268. As a result, the inside of the vertical supply cylinder portion 210 and the inside of the main cylinder 253 communicate with each other through the inside of the communication cylinder portion 263.

The communication cylinder portion 263 is formed so as to communicate with the space located between the seal cylinder portion 212e and the first check valve 236 in the inner cylinder 213. As a result, the inside of the main cylinder 253 communicates with the space located between the seal cylinder portion 212e and the first check valve 236 in the inner cylinder 213 through the communication cylinder portion 263. Therefore, the first check valve 236 can switch the communication between the inside of the container body A and the inside of the main cylinder 253 and the shutoff thereof.

The first check valve 236 is closed when the pressure inside the main cylinder 253 is pressurized to block communication between the inside of the container body A and the inside of the vertical supply cylinder portion 210, and the first check valve 236 is directed upward when the pressure is reduced inside the main cylinder 253. It is a check valve that opens by being displaced and allows communication between the inside of the container body A and the inside of the vertical supply cylinder portion 210. As a result, when the first check valve 236 is closed, the communication between the inside of the container body A and the inside of the main cylinder 253 through the vertical supply cylinder portion 210 is cut off, and when the first check valve 236 is opened, the vertical check valve 236 is vertically opened. Communication between the inside of the container body A and the inside of the main cylinder 253 through the inside of the supply cylinder portion 210 is allowed.

In the illustrated example, the communication cylinder portion 263 protrudes into the inner cylinder 213. As a result, the portion of the communication cylinder portion 263 located inside the inner cylinder 213 is locked to the first check valve 236 when the first check valve 236 is opened, and the first check valve 236 It is possible to regulate further upward displacement.
However, the communication cylinder portion 263 does not have to protrude into the inner cylinder 213. In this case, for example, the regulation protrusion 212f can be used to regulate the further upward displacement of the first check valve 236.

The inside of the piston guide 262 is open rearward. Inside the piston guide 262, a fitting cylinder portion 241 projecting forward from the rear wall of the cylinder portion 240 (small diameter portion 212b of the outer cylinder 212) is fitted from the rear.

The main piston 252 includes a cylindrical connecting portion 270 connected to the trigger portion 51, and a piston cylinder 271 located behind the connecting portion 270 and having a diameter larger than that of the connecting portion 270, as a whole. It is formed in the shape of a cylinder that opens to the rear.
The main cylinder 253 and the main piston 252 are arranged on a common axis (not shown) extending along the front-rear direction.

The piston cylinder 271 is an outer cylinder that opens rearward and protrudes outward in the radial direction from the rear end of the piston body 272 and the piston body 272 into which the piston guide 262 is inserted. A sliding cylinder portion 273 that is in close sliding contact with the inner peripheral surface of the portion 260 is provided.

The inner diameter of the piston main body 272 is formed to be slightly larger than the outer diameter of the piston guide 262. The inner peripheral surface of the piston main body 272 and the outer peripheral surface of the piston guide 262 face each other with a slight gap in the radial direction of the piston cylinder 271.
At the rear end of the piston body 272, an annular inner lip portion 272a is formed that projects inward in the radial direction of the piston body 272 and is in close sliding contact with the outer peripheral surface of the piston guide 262. As a result, a sealing property is ensured between the inner lip portion 272a and the outer peripheral surface of the piston guide 262.

The sliding cylinder portion 273 is formed in a tapered shape whose diameter gradually increases from the central portion in the front-rear direction toward the front and rear, and includes outer lip portions 273a located at both ends in the front-rear direction. The outer lip portion 273a is in close sliding contact with the inner peripheral surface of the outer cylinder portion 260. As a result, a sealing property is ensured between the outer lip portion 273a and the inner peripheral surface of the outer cylinder portion 260.

The connecting portion 270 of the main piston 252 is connected to the trigger portion 51 via a connecting shaft 86 described later. As a result, the main piston 252 is urged forward together with the trigger portion 51 by the urging force of the elastic plate portion 54, and at the same time, moves rearward as the trigger portion 51 swings backward, and is inside the main cylinder 253. Pushed into.

The main piston 252 is located in the foremost position corresponding to the trigger portion 51 when it is in the foremost swing position (frontmost movement position), and the sliding cylinder portion 273 is the first vent hole 264. Is blocked. Then, when the main piston 252 moves rearward by a predetermined amount from the frontmost position due to the rearward swing of the trigger portion 51, the sliding cylinder portion 273 opens the first ventilation hole 264. As a result, the inside of the container body A communicates with the outside through the third ventilation hole 266, the second ventilation hole 265, and the first ventilation hole 264.

The upper end portion of the main plate member 80 of the trigger portion 51 is in contact with the lower end portion of the regulation wall 372, which will be described later, from the rear by the urging by the elastic plate portion 54. As a result, the trigger portion 51 is positioned at the most forward swing position.
Since the configurations of the trigger portion 51 and the elastic plate portion 54 are the same as those of the first embodiment, the same reference numerals are given to the same configurations, and the description thereof will be omitted.

As shown in FIG. 8, the nozzle portion 3 includes a nozzle plate 370, a mounting cylinder 371, a regulation wall 372, an insertion portion 373, a nozzle shaft portion 374, and a surrounding cylinder 375, and is arranged in front of the ejector main body 2. ..

The nozzle plate 370 is arranged so as to cover the front end opening of the injection cylinder portion 211 from the front. The mounting cylinder 371 projects rearward from the nozzle plate 370 and is tightly fitted to the injection cylinder portion 211.
A connection hole 376 is formed in the nozzle plate 370. The connection hole 376 is arranged inside the mounting cylinder 371 in a plan view of the nozzle plate 370 from the front-rear direction. The lower end of the regulation wall 372 is in contact with the upper end of the main plate member 80 of the trigger portion 51 from the front, thereby positioning the trigger portion 51 at the foremost swing position.

The insertion portion 373 projects rearward from the nozzle plate 370 and is inserted from the front over almost the entire length in the front-rear direction in the injection cylinder portion 211. At this time, the insertion portion 373 is inserted into the injection cylinder portion 211 so as to secure a slight gap S3 in the upper portion of the internal space of the injection cylinder portion 211. Thereby, the space volume in the injection cylinder portion 211 can be reduced. The gap S3 communicates with the connection hole 376.

The nozzle shaft portion 374 is arranged so that the central axis is located slightly above the axis O2 of the storage cylinder 293. The surrounding cylinder 375 slightly protrudes forward from the nozzle shaft portion 374. An annular flow passage 377 communicating with the connection hole 376 is formed between the nozzle shaft portion 374 and the surrounding cylinder 375.

A nozzle cap 378 formed with a ejection hole 4 that opens toward the front is attached to the nozzle shaft portion 374, and the flow passage 377 and the ejection hole 4 communicate with each other. As a result, the inside of the storage cylinder 293 communicates with the ejection hole 4 through the communication hole 295, the inside of the injection cylinder portion 211, the connection hole 376 and the flow passage 377. That is, the communication hole 295 communicates the inside of the storage cylinder 293 with the ejection hole 4.

In the trigger type liquid ejector 1B configured as described above, as shown in FIG. 8, the main piston 252 moves rearward from the frontmost position between the main piston 252 and the main cylinder 253. At that time, a communication passage 380 is formed in which the inside of the main cylinder 253 is communicated with the inside of the container A by a route different from the route via the inside of the communication cylinder portion 263.

The communication passage 380 will be described in detail.
An annular recessed portion 381 is formed on the outer peripheral surface of the rear end portion of the piston guide 262. When the main piston 252 moves rearward from the frontmost position, the inner lip portion 272a formed in the piston main body portion 272 reaches the recessed portion 381 and can be accommodated in the recessed portion 381.
The recessed portion 381 is not limited to the case where it is formed in an annular shape, and may be recessed toward the inside of the piston guide 262. For example, the recessed portion 381 is formed only at one position on the outer peripheral surface of the piston guide 262. Alternatively, a plurality of piston guides 262 may be formed at intervals in the circumferential direction.

In the present embodiment, the recessed portion 381 is formed at a position facing the inner lip portion 272a in the radial direction when the main piston 252 moves to the rearmost position. As a result, when the main piston 252 moves to the rearmost position, the inner lip portion 272a is accommodated in the recessed portion 381.

By accommodating the inner lip portion 272a in the recessed portion 381, a slight gap is formed between the inner lip portion 272a and the recessed portion 381. As a result, the inside of the main cylinder 253 and the gap between the inner peripheral surface of the piston main body 272 and the outer peripheral surface of the piston guide 262 can communicate with each other through the gap between the inner lip portion 272a and the recessed portion 381. ing.

A plurality of ribs 382 protruding forward and extending along the radial direction of the piston guide 262 are formed on the rear wall portion 261 of the main piston 252 at intervals in the circumferential direction of the piston guide 262. The inner lip portion 272a comes into contact with the plurality of ribs 382 from the front when the main piston 252 moves to the rearmost position. As a result, the inside of the main cylinder 253 easily communicates with the gap between the inner lip portion 272a and the recessed portion 381 through the gap between the ribs 382 adjacent to each other in the circumferential direction.
However, the rib 382 described above is not an essential configuration and may not be provided.

The front end wall of the piston guide 262 is formed with a communication opening 383 that penetrates the front end wall in the front-rear direction and communicates between the inside of the piston body 272 and the inside of the piston guide 262.
In the illustrated example, a plurality of communication openings 383 are formed at intervals in the circumferential direction of the piston guide 262. The communication opening 383 communicates with the gap between the inner peripheral surface of the piston main body 272 and the outer peripheral surface of the piston guide 262, and communicates with the inside of the fitting cylinder portion 241 through the inside of the piston guide 262.
The communication opening 383 is not limited to the case where a plurality of communication openings 383 are formed, and for example, only one communication opening may be formed having the same diameter as the inner diameter of the piston guide 262.

In the front portion between the inner peripheral surface of the small diameter portion 212b of the outer cylinder 212 and the outer peripheral surface of the small diameter portion 213b of the inner cylinder 213 in the vertical supply cylinder portion 210, the inside of the fitting cylinder portion 241 and the third communication A connecting passage 384 that communicates with the inside of the pores 266 is formed.

As a result, the inside of the main cylinder 253 and the inside of the container body A are between the inner lip portion 272a and the recessed portion 381, the gap between the inner peripheral surface of the piston main body portion 272 and the outer peripheral surface of the piston guide 262, and a communication opening. Through the inside of the portion 383, the inside of the piston guide 262, and the inside of the connecting passage 384, communication is possible by a route different from the route passing through the communication cylinder portion 263.
Therefore, between the inner lip portion 272a and the recessed portion 381, the gap between the inner peripheral surface of the piston main body portion 272 and the outer peripheral surface of the piston guide 262, the inside of the communication opening 383, the inside of the piston guide 262, and the connection passage 384. The inside functions as the communication passage 380.

(Obi)
The ejector main body 2 of the present embodiment includes a plurality of strips 114 and a sliding member 150, as in the first embodiment. Since the configurations of the band 114 and the sliding member 150 are the same as those of the first embodiment, the description thereof will be omitted. The first end 114a of the band 114 is connected to the storage plunger 310 by being connected to the rear end of the rod 330. Further, the annular body 115 is sandwiched between the rear cylinder portion 297 and the spring seat 352, so that the second end portion 114c of the band body 114 is connected to the storage cylinder 293.

(Action of trigger type liquid ejector)
Next, a case where the trigger type liquid ejector 1B configured as described above is used will be described.
It is assumed that each part of the trigger type liquid ejector 1B is filled with the liquid by a plurality of operations of the trigger part 51, and the liquid can be sucked up from the vertical supply cylinder part 210.

In the state shown in FIG. 8, when the trigger portion 51 is pulled backward against the urging force of the elastic plate portion 54, as shown in FIG. 9, the main piston 252 moves to the front as the trigger portion 51 moves backward. Since it moves backward from the position, the inside of the main cylinder 253 can be pressurized. As a result, the liquid in the main cylinder 253 can be supplied to the inner cylinder 213 of the vertical supply cylinder portion 210 through the communication cylinder portion 263. Then, the liquid supplied to the inner cylinder 213 pushes down the first check valve 236 to close the valve, and is supplied to the supply hole 291 through the connection cylinder portion 230 to push up the second check valve 302 to open the valve. ..

As a result, the liquid can be supplied into the storage cylinder 293, and the inside of the storage cylinder 293 can be pressurized. As a result, the pressure of the liquid supplied into the storage cylinder 293 can be increased, and the storage plunger 310 can be moved backward from the most advanced position against the urging of the urging member 360. .. At the initial stage when the liquid begins to be introduced into the storage cylinder 293, the liquid enters the recessed groove 326. Therefore, it is easy to move the storage plunger 310 backward.

By moving the storage plunger 310 backward, the front end surface of the closing wall 322 can be separated from the rear end surface of the valve base 301 to open the valve, and the communication hole 295 can be opened. Therefore, the liquid with increased pressure can be guided to the ejection hole 4 through the communication hole 295, the inside of the injection cylinder portion 211, the connection hole 376, and the flow passage 377, and the liquid can be injected forward from the ejection hole 4. can. At the same time, the storage plunger 310 can be moved backward as described above.

In this way, each time the trigger portion 51 is pulled backward, the liquid can be ejected from the ejection hole 4, and the storage plunger 310 is moved rearward to store the liquid in the storage cylinder 293 (filling). can do.
When the storage plunger 310 moves rearward, the urging member 360 elastically compresses and deforms, so that an urging force (thrust) directed toward the front can be applied to the storage plunger 310.

After that, when the operation of pulling the trigger portion 51 is stopped and the trigger portion 51 is released, the trigger portion 51 is urged forward by the elastic restoring force of the elastic plate portion 54 and returns to the original position. The main piston 252 is restored and moved forward in the main cylinder 253. Therefore, since the pressure in the main cylinder 253 can be reduced to a negative pressure higher than the pressure in the container body A, the liquid in the container body A can be sucked up into the vertical supply cylinder portion 210.
Then, the newly sucked liquid pushes up the first check valve 236 to open the valve, and is introduced into the main cylinder 253 through the communication cylinder portion 263. This makes it possible to prepare for the next injection.
At this time, the second check valve 302 is closed, and the amount of upward movement of the first check valve 236 is regulated by a part of the communication cylinder portion 263 protruding into the inner cylinder 213. ..

Then, after the main cylinder 53 is filled with the liquid by repeatedly pulling the trigger portion 51 backward, when the operation of the trigger portion 51 is stopped, the storage through the vertical supply cylinder portion 210 and the connection cylinder portion 230 is performed. Although the supply of the liquid into the cylinder 293 is stopped, the elastic restoring force of the urging member 360 causes the storage plunger 310 to start moving forward (restoring and moving toward the other side in the axial direction) toward the most advanced position. At this time, the outflow of the liquid from the storage cylinder 293 into the connecting cylinder portion 230 is regulated by the second check valve 302.

As a result, the liquid accumulated in the storage cylinder 293 is guided to the ejection hole 4 through the communication hole 295, the injection cylinder portion 211, the connection hole 376 and the flow passage 377, and the liquid is continuously injected forward through the ejection hole 4. be able to.
In this way, the liquid can be ejected not only when the trigger portion 51 is pulled backward, but also when the trigger portion 51 is not operated, and the liquid can be continuously injected.

In particular, according to the trigger type liquid ejector 1B of the present embodiment, when the main piston 252 moves rearward in the main cylinder 253 with the operation of the trigger portion 51 and is located at the rearmost position, FIG. 9 shows. As shown, the inner lip portion 272a of the main piston 252 reaches the recessed portion 381 of the piston guide 262 and is housed in the recessed portion 381. As a result, the inside of the main cylinder 253 and the inside of the container body A can be communicated with each other through the communication passage 380.
Therefore, even if air is contained in the liquid sucked from the container body A through the vertical supply cylinder portion 210 and the communication cylinder portion 263 into the main cylinder 253, the main cylinder 253 is moved backward with the main piston 252. Air can be mainly discharged from the inside, and air can be released to the inside of the container body A through the communication passage 380.

Therefore, the pressure inside the main cylinder 253 can be reliably reduced by the amount of air discharged and the subsequent restoration movement toward the front of the main piston 252. Therefore, the liquid can be efficiently sucked into the main cylinder 253 from the container body A, and the liquid is efficiently supplied into the storage cylinder 293 with the subsequent operation of the trigger portion 51, and the liquid is efficiently supplied into the storage cylinder 293. Can be quickly pressurized.

Therefore, when the trigger portion 51 is operated for the first time from the stage when it is not in use, a part of the air in the main cylinder 253 can be discharged to the inside of the container body A through the communication passage 380 by operating the trigger portion 51. can. Therefore, the liquid sucked up from the container body A can be stored in the main cylinder 253 while efficiently discharging the air in the main cylinder 253, and the preparation before use can be completed promptly with a small number of priming times. can.
Further, after the above-mentioned preparation is completed, the liquid can be efficiently filled in the storage cylinder 293 by operating the trigger portion 51, so that continuous injection of the liquid can be reliably and promptly performed while avoiding (suppressing) injection defects. It can be done and good injection performance can be obtained.

As described above, the pressure inside the main cylinder 253 can be reliably reduced, so that the number of priming can be reduced and injection defects can be avoided, and a high-quality trigger-type liquid ejector with improved ease of use and convenience. It can be 1B.
In particular, when the main piston 252 moves from the frontmost position to the rearmost position, the inner lip portion 272a is accommodated in the recessed portion 381, so that almost all of the liquid in the main cylinder 253 is inside the vertical supply cylinder portion 210. Air can be discharged from the main cylinder 253 at the final stage of the supply. Therefore, both the appropriate supply of the liquid from the inside of the main cylinder 253 into the vertical supply cylinder portion 210 and the appropriate discharge of air from the inside of the main cylinder 253 can be performed more stably and reliably. Therefore, it is possible to more effectively avoid injection defects and reduce the number of priming.

It is preferable to efficiently increase the pressure in the storage cylinder 293 during continuous injection of the liquid to quickly move the storage plunger 310 backward. For that purpose, for example, by operating the trigger portion 51, for example, the pressure in the main cylinder 253, the pressure in the portion of the vertical supply cylinder portion 210 located above the first check valve 236, and the pressure in the connecting cylinder portion 230. It is preferable to efficiently increase the pressure and efficiently supply the increased pressure liquid into the storage cylinder 293.
Therefore, for example, as the pipe 215 that sucks up the liquid from the inside of the container body A, it is preferable to use a pipe having a reduced diameter. In this case, while efficiently increasing the pressure in the main cylinder 253, the pressure in the portion of the vertical supply cylinder 210 located above the first check valve 236, and the pressure in the connecting cylinder 230, The liquid can be sucked up, which can lead to a rapid continuous injection.

By the way, it is conceivable that the decompression in the main cylinder 253 may be insufficient or the decompression may not be performed during use. The cause may be, for example, a case where bubbles are generated in the main cylinder 253, a case where the forward urging force of the storage plunger 310 is strong, or the like.
However, according to the present embodiment, for example, even if bubbles are generated in the main cylinder 253 during use, by positioning the main piston 252 at the rearmost position, bubbles can be sent from the inside of the main cylinder 253 through the communication passage 380. It can be discharged into the body A. Therefore, when the inside of the main cylinder 253 is depressurized by the subsequent restoration movement toward the front of the main piston 252, the volume occupied by the discharged bubbles, the liquid from the inside of the container body A can be sucked into the main cylinder 253. can. Therefore, even when bubbles are generated, the pressure inside the main cylinder 253 can be reliably reduced, and the liquid can be efficiently filled in the storage cylinder 293, so that the injection cannot be performed due to the generation of bubbles. Stable injection can be performed without causing injection defects such as disappearance.

The bubbles are not limited to the bubbles generated in the main cylinder 253. For example, bubbles are generated in the vertical supply cylinder portion 210 located above the first check valve 236 and in the connection cylinder portion 230. Even in the case of doing so, it is possible to finally discharge the bubbles into the inside of the container body A while gradually drawing the bubbles into the communication passage 380, and the same effect can be achieved.

Further, when the trigger portion 51 is operated, a part of the pressure in the main cylinder 253 can be released to the inside of the container body A through the communication passage 380, so that the pressure in the main cylinder 53 becomes too high, for example, and the ejection hole 4 It is possible to prevent a problem that the liquid is suddenly ejected from the surface, so-called "dripping". Therefore, the liquid drainage can be improved.

Further, the liquid can be ejected not only when the trigger portion 51 is pulled backward, but also when the trigger portion 51 is not operated, and the liquid can be continuously injected.
In particular, since the pressure inside the main cylinder 253 can be reliably reduced, the number of priming can be reduced and injection defects can be avoided, and the high-quality trigger type liquid ejector 1B that is easy to use and has improved convenience. can do. When, for example, a liquid containing a surfactant or the like and easily forming bubbles is used, the trigger type liquid ejector 1B of the present embodiment can be particularly preferably used.

Further, the storage cylinder 293 is formed with a communication hole 295 communicating with the ejection hole 4 and a supply hole 291 communicating with the inside of the injection cylinder portion 211, and the storage plunger 310 directly passes through the communication hole 295 through the closing wall 322. Therefore, the space volume (internal volume occupied by the path) of the path from the connecting cylinder portion 230 to the storage cylinder 293 can be easily reduced with less restrictions. Therefore, when the trigger portion 51 is operated, the liquid can be immediately supplied from the inside of the connecting cylinder portion 230 into the storage cylinder 293, the pressure in the storage cylinder 293 is rapidly increased, and the storage plunger 310 is immediately moved backward. Easy to make. Therefore, the liquid can be jetted quickly, and the operability can be improved.

Further, since the closing wall 322 that functions as a pressure accumulating valve is provided and the closing wall 322 directly closes the communication hole 295, the liquid can be pressurized until the closing wall 322 opens the communication hole 295. Therefore, it is possible to prevent the liquid from being immediately ejected from the ejection hole 4 by the operation of the trigger portion 51, and it is possible to inject the liquid at an appropriate pressure (injection pressure). Therefore, even in cases other than continuous injection, injection can be performed in a good injection mode by operating the trigger unit 51. Further, since it is possible to prevent the liquid having a low pressure from flowing to the ejection hole 4 side due to the closing wall 322, for example, during storage, it is possible to effectively suppress the liquid leakage from the ejection hole 4. Further, since it is not necessary to separately provide a high-pressure valve or the like, it is easy to simplify the configuration.

Further, since the urging member 360 can be elastically deformed and accumulated in pressure by moving the storage plunger 310 backward, the liquid can be injected in a state where pressure is applied, and continuous injection in a good injection mode can be performed.

Further, when the liquid in the storage cylinder 293 is ejected from the ejection hole 4, the outflow of the liquid from the storage cylinder 293 into the connecting cylinder portion 230 can be regulated by the second check valve 302. Therefore, for example, it is possible to easily increase the pressure of the liquid ejected from the ejection hole 4 through the ejection cylinder portion 211. Therefore, the injection form of the liquid can be maintained from the start of the injection to the stop of the injection, and the liquid can be easily injected in various injection modes.

Further, according to the trigger type liquid ejector 1B of the present embodiment, since the band 114 and the sliding portion 151 similar to those of the first embodiment are provided, these act as moving pulleys, so that the first embodiment is performed. The same effect as the morphology can be obtained.

Further, when the storage plunger 310 is located at the rearmost retracted position, the lip portion 323 of the storage plunger 310 is located on the connecting groove 340. At this time, the inside of the front cylinder portion 296 communicates with the recovery hole 341 through the connecting groove 340. In this way, the recovery hole 341 communicates with the inside of the storage cylinder 293 and the inside of the vertical supply cylinder portion 210 when the storage plunger 310 moves backward by a predetermined amount or more. Further, the vertical supply cylinder portion 210 is formed with a recovery passage 342 that communicates with the recovery hole 341 and also communicates with the inside of the container body A. In this way, when the storage plunger 310 moves backward by a predetermined amount or more, the inside of the storage cylinder 293 and the inside of the container body A communicate with each other through the collection hole 341 and the collection passage 342.

Therefore, when the liquid is further introduced into the storage cylinder 293 while the storage plunger 310 is moved backward by a predetermined amount, the liquid can be returned to the container body A through the recovery hole 341 and the recovery passage 342. .. As a result, it is possible to prevent the pressure in the storage cylinder 293 from becoming excessively high.
Further, since the recovery hole 341 is arranged directly above the vertical supply cylinder portion 210, the contents in the storage cylinder 293 can be more efficiently returned to the container body A.

When the storage plunger 310 is advanced, the storage plunger 310 moves to the most advanced position unless the operation of pulling the trigger unit 51 is performed again, but the operation of pulling the trigger unit 51 may be repeated before that.
In this case, the storage plunger 310 gradually moves backward as a whole while repeating backward and forward movements. As a result, the liquid can be gradually stored in the storage cylinder 293. Then, by moving the storage plunger 310 to, for example, the last retracted position, the liquid can be continuously injected for a long time until the storage plunger 310 moves from the last retracted position to the most advanced position.

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, a trigger type liquid ejector in which the operating member 130 of the first embodiment and the recovery hole 341 and the recovery passage 342 of the second embodiment are used in combination may be used.
Further, in the first and second embodiments, the trigger portion 51 can swing backward, but a mode in which the trigger portion 51 moves backward can be appropriately adopted. For example, the trigger portion 51 may be slidable toward the rear.

In addition, it is possible to replace the constituent elements in the above-described embodiment with well-known constituent elements as appropriate without departing from the spirit of the present invention, and the above-described embodiments and modifications may be appropriately combined.

1A, 1B ... Trigger type liquid ejector 2 ... Ejector body 3 ... Nozzle part 4 ... Ejection hole 10 ... Vertical supply cylinder part 11 ... Injection cylinder part 30, 302 ... Second check valve 36, 236 ... First check valve Valves 50, 250 ... Trigger mechanism 51 ... Trigger part 52 ... Main piston 53 ... Main cylinder 96, 293 ... Storage cylinder 91, 310 ... Storage plunger 110b ... Locked part 114 ... Band 114a ... First end 114b ... Intermediate Part 114c ... Second end part 130 ... Actuating member 133 ... Regulatory part 137 ... Locking part 160, 360 ... Biasing member 341 ... Recovery hole 342 ... Recovery passage A ... Container body

Claims (4)

The ejector body attached to the container containing the liquid,
It is provided with a nozzle portion which is arranged in front of the ejector main body and has an ejection hole for ejecting a liquid.
The ejector body is
A vertical supply cylinder that extends in the vertical direction and sucks up the liquid inside the container.
An injection cylinder portion that is disposed in front of the vertical supply cylinder portion and guides the liquid in the vertical supply cylinder portion to the ejection hole.
A trigger portion is provided in front of the vertical supply cylinder portion so as to be movable rearward in a forward urged state, and the liquid is transferred from the inside of the vertical supply cylinder portion to the inside of the injection cylinder portion by moving the trigger portion to the rear. A trigger-type liquid ejector provided with a trigger mechanism for circulating toward the ejection hole side through the liquid ejector.
The trigger mechanism is
The main piston that moves back and forth with the movement of the trigger part,
The inside is pressurized and depressurized with the movement of the main piston, and the inside is provided with a main cylinder that communicates with the inside of the vertical supply cylinder portion.
The ejector body is
A storage cylinder in which the liquid that has passed through the vertical supply cylinder portion is supplied to the inside by moving the trigger portion to the rear.
A storage plunger that is movably arranged in the storage cylinder in the axial direction along the central axis and moves toward one side of the axial direction as the liquid is supplied into the storage cylinder.
A first reverse that blocks communication between the inside of the container and the inside of the vertical supply cylinder when pressurizing the inside of the main cylinder, and allows communication between the inside of the container and the inside of the vertical supply cylinder when depressurizing the inside of the main cylinder. Check valve and
The communication between the storage cylinder and the vertical supply cylinder is allowed when the pressure in the main cylinder is pressurized, and the communication between the storage cylinder and the vertical supply cylinder is cut off when the pressure in the main cylinder is reduced. 2 Check valve and
An urging member that generates an urging force that urges the storage plunger toward the other side in the axial direction.
The urging member is located between the first end portion connected to the storage plunger, the second end portion connected to the storage cylinder, and the first end portion and the second end portion. A trigger-type liquid ejector comprising an intermediate portion that receives force and a band having. The storage cylinder extends in the front-rear direction and
The ejector main body is provided with an actuating member arranged so as to be movable rearward with respect to the storage cylinder.
The operating member is
A locking portion that is arranged behind the locked portion formed on the storage plunger and that the locked portion is locked from the front when the storage plunger moves backward.
The trigger according to claim 1, further comprising a regulating portion that regulates the swing of the trigger portion in close proximity to or in contact with the trigger portion when the operating member moves backward with respect to the storage cylinder. Formula liquid ejector. The storage cylinder is formed with a recovery hole for communicating the inside of the storage cylinder and the inside of the vertical supply cylinder portion when the storage plunger moves backward by a predetermined amount or more.
The trigger type according to claim 1, wherein the vertical supply cylinder portion is formed with a collection passage that communicates with the collection hole and vertically traverses the vertical supply cylinder portion to communicate with the inside of the container. Liquid ejector. The trigger type liquid ejector according to any one of claims 1 to 3, wherein the intermediate portion is folded back so as to open toward the one side in the axial direction.

Images