JP2023067041A - Trigger-type liquid sprayer - Google Patents

Abstract

To provide a trigger-type liquid sprayer configured so that forward movement of a piston can be restricted, regardless of an assembly state of a trigger part.SOLUTION: A trigger-type liquid sprayer 1 comprises a sprayer main body 2 and a nozzle member 3 having a spraying hole 4. The sprayer main body 2 comprises a vertical supply cylindrical part 10 that extends in a vertical direction to suck up liquid in a container body A, and a trigger mechanism 20 that makes liquid flow from the inside of the vertical supply cylindrical part 10 toward the spraying hole 4, by backward movement of a trigger part 21. The trigger mechanism 20 comprises: a main piston 22 that moves back and forth accompanying movement of the trigger part 21; a main cylinder 23 whose inner part is compressed and decompressed accompanying movement of the main piston 22 and whose inner part is communicated with the inside of the vertical supply cylindrical part 10; a piston urging member 24 that is arranged inside the main cylinder 23 and urges the main piston 22 forward; and a restricting member 100 that is fitted to the main cylinder 23 to restrict the main piston 22 from coming off forward.SELECTED DRAWING: Figure 1

Description

The present invention relates to trigger-type liquid ejectors.

A trigger-type liquid ejector is known that sucks up liquid from a container body by operating a trigger part and ejects the liquid through an ejection hole. The trigger-type liquid ejector described in Patent Document 1 below includes a piston that moves back and forth along with the movement of the trigger section, and the interior is pressurized and decompressed along with the movement of the piston, and the interior is in the vertical supply cylinder section. and a biasing member arranged inside the cylinder and biasing the piston forward.

JP 2021-159841 A

In a conventional trigger-type liquid ejector, the front end of the piston is brought into contact with the trigger so that the piston, which is urged forward by the urging member, does not come out of the cylinder forward. However, the advance of the piston cannot be restricted before the trigger is assembled, and if the accuracy of assembling the trigger varies or deformation occurs, the piston moves forward beyond the designed forwardmost position and leaks. may occur. In addition, if the piston moves forward beyond the designed forwardmost position, the piston may not retract to the designed rearwardmost position when the trigger is pulled.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a trigger-type liquid ejector capable of regulating the advancement of the piston without depending on the assembled state of the trigger portion.

(1) A trigger-type liquid ejector according to the present invention includes an ejector main body attached to a container containing a liquid, and a ejector main body disposed in front of the ejector main body to eject the liquid forward. a nozzle member in which a jet hole is formed, the ejector main body includes a vertical supply tubular portion that extends in the vertical direction and sucks up the liquid in the container body, and a forward biasing state of the vertical supply tubular portion in front of the vertical supply tubular portion. a trigger mechanism arranged so as to be able to move rearward in the trigger mechanism, and causing the liquid to circulate from the vertical supply cylinder toward the ejection hole side by moving the trigger rearward; The trigger mechanism includes a main piston that moves back and forth as the trigger portion moves, and a main cylinder that pressurizes and decompresses along with the movement of the main piston and communicates with the vertical supply tube portion. a biasing member disposed inside the main cylinder to bias the main piston forward; a restricting member fitted to the main cylinder to restrict the main piston from coming off forward; Prepare.

According to the trigger-type liquid ejector of the present invention, when the trigger mechanism is operated and the trigger portion is moved backward, the inside of the main cylinder is pressurized by the retraction of the main piston, and the liquid inside the main cylinder is discharged into the vertical supply cylinder. It circulates from the inside toward the ejection port side. As a result, the liquid can be ejected forward through the ejection holes of the nozzle member. Further, when the operation of the trigger mechanism is stopped, since the main cylinder is provided with an urging member that urges the main piston forward, the main piston advances together with the trigger portion to reduce the pressure in the main cylinder. Liquid can be sucked up from the container body. Here, a restricting member is fitted to the main cylinder, and the restricting member restricts forward removal of the main piston. Therefore, even if the trigger portion is not yet assembled, the forward movement of the main piston can be reliably restricted. In addition, since the main cylinder, the biasing member, the main piston, and the restricting member can be unitized and assembled in advance, assembly to the ejector main body is facilitated.

(2) A guide cylinder is provided inside the main cylinder to guide the main piston in the longitudinal direction. An outer lip portion that is in sliding contact with a wall surface and a lip connecting portion that connects the inner lip portion and the outer lip portion are provided. A restricting piece that restricts forward removal may be provided.

In this case, the regulating piece of the regulating member directly abuts the lip connecting portion that connects the inner lip portion and the outer lip portion of the main piston in the longitudinal direction, thereby applying deformation to the inner lip portion and the outer lip portion. It is possible to restrict the forward movement of the main piston while preventing it from occurring. Therefore, the slidability and sealability of the main piston with respect to the guide tube and the main cylinder can be ensured.

(3) The regulating member includes an outer cylindrical portion that fits onto the main cylinder, and is connected to the outer cylindrical portion and inserted into the main cylinder, and is configured to extend along the entire circumference of the inner wall surface of the main cylinder. and a pair of grooves formed on the outer peripheral surface of the inner cylinder and extending in the front-rear direction.

In this case, since the outer cylindrical portion of the restricting member is fitted onto the main cylinder, the restricting member can be easily attached to the main cylinder. In addition, the inner cylindrical portion of the regulating member is inserted inside the main cylinder and is arranged with a gap from the entire circumference of the inner wall surface of the main cylinder. , the inner cylindrical portion can be inserted to a predetermined position in the main cylinder to restrict the forward movement of the main piston without depending on the dimensional accuracy of the inner wall surface of the main cylinder.

(4) The urging member is a metal spring, and the ejector main body is a reservoir in which the liquid that has passed through the vertical supply tube portion from the main cylinder is supplied to the interior thereof by the rearward movement of the trigger portion. a cylinder, which is disposed within the storage cylinder so as to be movable in the axial direction along the central axis thereof, and which moves in one direction in the axial direction as the liquid is supplied into the storage cylinder; A reservoir plunger urged toward the other side, and when the main cylinder is pressurized, cut off the communication between the container body and the main cylinder through the vertical supply tube portion, and A first check valve that allows communication between the container body and the main cylinder through the vertical supply cylinder portion when the pressure is reduced, and a check valve between the storage cylinder and the main cylinder when the main cylinder is pressurized. a second check valve that allows communication through the vertical supply cylinder portion and blocks communication between the storage cylinder and the main cylinder through the vertical supply cylinder portion when the pressure in the main cylinder is reduced; , may be provided.

In this case, by using a metal spring as the biasing member, it is possible to strengthen the suction of the liquid into the main cylinder. In addition, the first check valve and the second check valve can supply the liquid from the main cylinder through the vertical supply cylinder portion into the storage cylinder, while the liquid can be ejected through the ejection hole and the inside of the storage cylinder can be pressurized. can be done. Therefore, the storage plunger can be pushed toward one side in the axial direction against the forward bias, and the storage plunger can be moved toward the one side in the axial direction while ejecting the liquid. Therefore, every time the trigger portion is pulled, the reservoir plunger is moved to one side in the axial direction, and the liquid can be ejected while the reservoir cylinder is being filled with liquid. When the operation of the trigger portion is stopped after the storage cylinder is filled with the liquid, the supply of the liquid into the storage cylinder through the vertical supply cylinder portion is stopped. Begin to restore and move. 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, it is possible to continuously eject the liquid.

According to the trigger-type liquid ejector of the present invention, the forward movement of the main piston can be restricted without depending on the assembled state of the trigger portion.

1 is a longitudinal sectional view showing a trigger type liquid ejector according to one embodiment of the present invention; FIG. FIG. 4 is an enlarged view showing the essential parts of the trigger mechanism according to one embodiment of the present invention; It is a rear view which shows the regulation member which concerns on one Embodiment of this invention. FIG. 4 is a vertical cross-sectional view showing a modification of the trigger-type liquid ejector according to one embodiment of the present invention; It is a rear view which shows the modification of the regulation member which concerns on one Embodiment of this invention.

A trigger-type liquid ejector according to an embodiment of the present invention will be described below with reference to the drawings. The following description will exemplify an ejection container in which a trigger-type liquid ejector is attached to the container body.

As shown in FIG. 1, a trigger-type liquid ejector 1 of this embodiment includes an ejector body 2 attached to a container body A containing liquid, and ejection holes 4 for ejecting liquid. 2, and a cover member 5 that covers the ejector body 2 and the nozzle member 3.
Note that each component of the trigger type liquid ejector 1 is a molded product using synthetic resin unless otherwise specified.

The ejector main body 2 mainly includes a vertical supply tube portion 10 , a trigger mechanism 20 , a connection tube portion 30 , a storage cylinder 40 , a storage plunger 50 and an injection tube portion 60 .
In the following description, the central axis of the vertical supply tube portion 10 is defined as the axis O1, the container body A side along the axis O1 is called the lower side, the opposite side is called the upper side, and the direction along the axis O1 is called the vertical direction. In addition, in a plan view from the vertical direction, one direction intersecting with the axis O1 is referred to as the front-rear direction, and a direction orthogonal to both the vertical direction and the front-rear direction is referred to as the left-right direction.

Further, the central axis of the storage cylinder 40 is assumed to be the axis O2. In this embodiment, the axis O2 extends in the front-rear direction. In this embodiment, the front-rear direction corresponds to the axial direction along the central axis of the storage cylinder 40 . In this embodiment, the rear side corresponds to one side of the axial direction along the central axis of the storage cylinder 40 , and the front side corresponds to the other side of the axial direction along the central axis of the storage cylinder 40 . However, the axial direction along the axis O2 does not have to coincide with the front-rear direction.

The vertical supply cylinder part 10 extends vertically and sucks up the liquid in the container body A. As shown in FIG. The vertical supply tube portion 10 is attached to the container body A with an attachment cap 11 . The upper portion of a pipe 12 that extends vertically and sucks liquid from the container body A is fitted to the vertical supply tube portion 10 . A first check valve 13 and a second check valve 14 are provided above the fitting position of the pipe 12 in the vertical supply tubular portion 10 .

The first check valve 13 cuts off the communication between the inside of the container body A and the inside of the main cylinder 23 through the inside of the vertical supply tubular portion 10 when the inside of the main cylinder 23 of the trigger mechanism 20 is pressurized, and the inside of the main cylinder 23 is closed. By displacing upward when the pressure is reduced, the inside of the container body A and the inside of the main cylinder 23 are allowed to communicate with each other through the inside of the vertical supply tubular portion 10 .

A second check valve 14 is arranged above the first check valve 13 . The second check valve 14 allows the liquid to be supplied from the vertical supply cylinder portion 10 to the storage cylinder 40 and restricts the liquid from flowing out from the storage cylinder 40 into the vertical supply cylinder portion 10 .

A cylinder tube portion 15 is provided on the front side of the vertical supply tube portion 10 . The cylinder tube portion 15 protrudes forward from the vertical supply tube portion 10 and opens forward. A main cylinder 23 is fitted in the cylindrical portion 15 . The main cylinder 23 is formed in a bottomed cylindrical shape that is open forward and closed rearward. The main cylinder 23 is in spatial communication between the first check valve 13 and the second check valve 14 in the vertical supply cylinder 10 at a portion of its rear wall.

The trigger mechanism 20 includes a trigger portion 21, a main piston 22, a main cylinder 23, and a piston biasing member 24 (biasing member). The trigger mechanism 20 can circulate the liquid from the vertical supply tubular portion 10 toward the ejection hole 4 side by moving the trigger portion 21 rearward.

The trigger part 21 is arranged in front of the vertical supply tube part 10 so as to be movable rearward in a forward biased state. The trigger portion 21 is pivotally supported by the nozzle member 3 below the injection cylinder portion 60 so as to be swingable in the front-rear direction. The trigger part 21 extends downward from a position supported by the nozzle member 3 and is positioned in front of the main piston 22 and the main cylinder 23 .

In this embodiment, a stopper T is detachably provided in the front-back direction gap between the trigger portion 21 and the main cylinder 23 . The stopper T abuts against the trigger portion 21 and the main cylinder 23 respectively, thereby restricting the rearward swinging of the trigger portion 21 . Note that the stopper T may be in a detached state.

The main piston 22 is arranged inside the main cylinder 23 so as to be movable in the front-rear direction. The main piston 22 is movable in the front-rear direction in conjunction with the movement of the trigger portion 21 . The inside of the main cylinder 23 is pressurized and depressurized as the main piston 22 moves in the front-rear direction. The main piston 22 is formed in a capped tubular shape that is open rearward and closed frontward.

The main piston 22 is urged forward by the urging force of the piston urging member 24 together with the trigger portion 21 . The main piston 22 retreats and is pushed into the main cylinder 23 as the trigger portion 21 moves rearward. The main piston 22 is positioned at the forwardmost position corresponding to the trigger portion 21 being at the forwardmost swing position.

The piston biasing member 24 is a metal spring. The piston biasing member 24 is arranged coaxially with the main piston 22 and the main cylinder 23 and biases the trigger portion 21 forward via the main piston 22 . A piston biasing member 24 is positioned between the top wall of the main piston 22 and the bottom wall of the main cylinder 23 . The material of the piston biasing member 24 is not limited to metal, and for example, a resin spring or the like may be used.

The connection tube portion 30 is arranged above the cylinder tube portion 15 . The connection tube portion 30 extends forward from the upper end portion of the vertical supply tube portion 10 . The inside of the connecting tubular portion 30 communicates with the vertical supply tubular portion 10 above the closed position by the second check valve 14 . A blocking plug 31 is fitted to the front end portion of the connecting tube portion 30 . The liquid flowing forward in the connecting tube portion 30 hits the blocking plug 31 and turns upward, and flows into the storage cylinder 40 through the gap between the blocking plug 31 and the upper end portion of the connecting tube portion 30 .

The storage cylinder 40 is arranged above the vertical supply tube portion 10 and the connection tube portion 30 . The lower end portion of the storage cylinder 40 of this embodiment is formed integrally with the upper end portion of the vertical supply cylinder portion 10 and the upper end portion of the connection cylinder portion 30 . The inside of the storage cylinder 40 (storage space 41 ) is supplied with the liquid that has passed through the vertical supply cylinder portion 10 and the connection cylinder portion 30 by the rearward movement of the trigger portion 21 .

The storage plunger 50 is arranged in the storage cylinder 40 so as to be movable in the longitudinal direction along the axis O2. The storage plunger 50 slides back and forth within the storage cylinder 40 . At the forwardmost position, the storage plunger 50 blocks communication between the inside of the vertical supply tube portion 10 and the ejection hole 4 (inside the ejection tube portion 60). The storage plunger 50 communicates the inside of the vertical supply cylinder portion 10 with the ejection hole 4 (inside the injection cylinder portion 60) when moving rearward from the forwardmost position. A space located in front of the storage plunger 50 in the storage cylinder 40 functions as a storage space 41 .

The liquid that has passed through the vertical supply tube portion 10 is stored in the storage space 41 . The storage space 41 expands as the storage plunger 50 moves rearward due to the supply of liquid. The storage plunger 50 moves rearward as the liquid is supplied into the storage cylinder 40 . The storage space 41 communicates with the vertical supply tube portion 10 through the connection tube portion 30 . The storage space 41 can also communicate with the inside of the injection cylinder portion 60 . When the storage plunger 50 is at the forwardmost position, the storage space 41 is blocked from communicating with the inside of the ejection cylinder portion 60 . When the storage plunger 50 is retracted from the forwardmost position, the storage space 41 communicates with the inside of the ejection cylinder portion 60 .

A plunger biasing member 51 that biases the storage plunger 50 forward is provided in the storage cylinder 40 . The plunger biasing member 51 is arranged behind the storage plunger 50 inside the storage cylinder 40 . In the initial state before the user operates the trigger part 21, the plunger biasing member 51 biases the storage plunger 50 forward, so that the storage plunger 50 is positioned at the forwardmost position. The plunger biasing member 51 is a metal coil spring arranged coaxially with the axis O2. However, for example, a resin spring may be used as the plunger biasing member 51, or another elastic member may be used.

Liquid is pressurized in the reservoir space 41 of the reservoir cylinder 40 until the reservoir plunger 50 moves rearward. When the hydraulic pressure in the storage space 41 reaches a predetermined value, the storage plunger 50 moves backward against the plunger biasing member 51 . Thereby, the liquid in the storage space 41 can be supplied to the ejection hole 4 side. The reservoir plunger 50 functions as an accumulator valve.

The injection cylinder part 60 extends forward from the storage cylinder 40 . The injection cylinder portion 60 communicates with the inside of the vertical supply cylinder portion 10 through the inside of the storage cylinder 40 (the storage space 41 ) and the inside of the connection cylinder portion 30 . The injection cylinder part 60 guides the liquid that has passed through the vertical supply cylinder part 10 , the connection cylinder part 30 and the storage cylinder 40 (storage space 41 ) to the ejection hole 4 . The nozzle member 3 is fitted onto the ejection cylinder portion 60 from the front. The nozzle member 3 is formed with a jet hole 4 that opens forward and jets liquid forward.

The cover member 5 is formed to cover the entire vertical supply cylinder portion 10 except for the lower end portion, the entire injection cylinder portion 60, and the entire storage cylinder 40 from at least both sides in the left-right direction and from above.

The trigger-type liquid ejector 1 configured as described above is provided with a restricting member 100 that is fitted to the main cylinder 23 and restricts the forward removal of the main piston 22 . As shown in the enlarged view of FIG. 2, the regulating member 100 includes an outer cylindrical portion 101 fitted to the main cylinder 23, and connected to the outer cylindrical portion 101 and inserted inside the main cylinder 23. An inner cylindrical portion 102 arranged with a gap on the entire circumference of the inner wall surface of the inner cylindrical portion 102 and a restricting piece 103 projecting rearward from the inner cylindrical portion 102 .

A fitting piece 104 protrudes from the inner peripheral surface of the outer cylindrical portion 101 . As shown in the rear view of the regulating member 100 in FIG. 3, a plurality of fitting pieces 104 are spaced apart in the circumferential direction of the outer cylindrical portion 101 (in this embodiment, four fitting pieces 104 are spaced at 90° intervals around the axis O2). is provided. As shown in FIG. 2, the fitting piece 104 abuts on a flange 23a provided at the front end opening of the main cylinder 23 from behind.

The outer diameter of the flange 23 a is the same as the outer diameter of the cylindrical portion 15 . The flange 23a is arranged with a gap in the front-rear direction with respect to the front end opening edge of the cylinder tube portion 15 . The fitting piece 104 is arranged so as to fit in the gap between the flange 23 a and the front end opening edge of the cylinder tube portion 15 . Thus, by providing a gap between the flange 23a and the front end opening edge of the cylinder tube portion 15 and fitting the fitting piece 104 of the regulating member 100 in the gap, the outer diameters of the main cylinder 23 and the cylinder tube portion 15 are reduced. can be minimized.

A front end portion of the outer cylindrical portion 101 and a front end portion of the inner cylindrical portion 102 are connected by an annular connecting portion 105 . The annular connecting portion 105 abuts from the front on the front end opening edge of the main cylinder 23 including the front facing surface of the flange 23a. A through hole 106 (molding hole) for molding the fitting piece 104 is formed in the annular connecting portion 105 at a position facing the fitting piece 104 in the front-rear direction.

The inner cylindrical portion 102 extends rearward from the radially inner edge of the annular connecting portion 105 . The outer peripheral surface of the inner cylindrical portion 102 is arranged with a gap from the entire circumference of the inner wall surface of the main cylinder 23 . That is, the inner tubular portion 102 is suspended from the outer tubular portion 101 via the annular connecting portion 105 and positioned in the front-rear direction. The rear end side of the outer peripheral surface of the inner cylindrical portion 102 is slightly reduced in diameter corresponding to the shape of the inner wall surface of the main cylinder 23 .

As shown in FIG. 3, a pair of grooves 107 extending in the front-rear direction are formed on the outer peripheral surface of the inner cylindrical portion 102 . The pair of grooves 107 are formed with a constant depth above and below the outer peripheral surface of the inner cylindrical portion 102 . The pair of grooves 107 extends to the rear facing surface of the annular connecting portion 105 and extends to the through holes 106 arranged vertically.

As shown in FIG. 2, a bottomed cylindrical main cylinder 23 that opens forward is provided with a cylindrical guide cylinder 25 that protrudes forward from the central portion of the rear wall portion. The guide tube 25 is formed in a bottomed tube shape that is open forward and closed rearward. A front end portion of the guide cylinder 25 is located rearward of a front end portion of the main cylinder 23 .

The bottom portion of the guide tube 25 is formed in an annular shape, and the fitting tube portion 16 provided on the cylinder tube portion 15 is fitted inside. A front end portion of the fitting tube portion 16 protrudes inside the guide tube 25 . The guide tube 25 is arranged coaxially with the fitting tube portion 16 . An annular recessed portion 25a is formed on the outer peripheral surface of the rear end portion of the guide tube 25 .

The main piston 22 includes a piston main body 22a which is open rearward and into which the guide tube 25 is inserted, and an inner lip 22b which is provided at the rear end of the piston main body 22a and is in sliding contact with the outer wall surface of the guide tube 25. a lip connecting portion 22c projecting radially outward from the rear end portion of the piston main body portion 22a; and an outer lip portion 22d.

The piston main body 22a is formed in a capped tubular shape that is open rearward and closed frontward. The inner diameter of the piston main body 22a is slightly larger than the outer diameter of the guide tube 25. As shown in FIG. A front end portion of the piston main body portion 22a is engaged with the trigger portion 21 (see FIG. 1) by coming into contact with the trigger portion 21 from behind.

An annular inner lip portion 22b is formed at the rear end portion of the piston main body portion 22a so as to protrude radially inward and come into sliding contact with the outer wall surface of the guide cylinder 25. As shown in FIG. As a result, a seal is ensured between the inner lip portion 22b and the outer wall surface of the guide tube 25. As shown in FIG. The inner lip portion 22b reaches the recessed portion 25a when the main piston 22 is positioned at the rearmost position.

When the inner lip portion 22b reaches the recessed portion 25a of the guide tube 25, a slight gap is formed between the inner lip portion 22b and the recessed portion 25a. Through this gap, the inside of the main cylinder 23 of the main cylinder 23 and the gap between the inner peripheral surface of the piston body portion 22a and the outer wall surface of the guide cylinder 25 communicate with each other. As a result, the inside of the main cylinder 23 communicates with the inside of the fitting tube portion 16 through the inside of the guide tube 25 .

The lip connecting portion 22c is formed in an annular shape that radially connects the inner lip portion 22b and the outer lip portion 22d. The front facing surface of the lip connecting portion 22c is flat. The outer lip portions 22d are formed as a pair of front and rear lip portions, each of which has a diameter that expands forward and rearward from the outer peripheral end of the lip connecting portion 22c, and is in sliding contact with the inner wall surface of the main cylinder 23. As shown in FIG. As a result, the seal between the outer lip portion 22d and the inner wall surface of the main cylinder 23 is ensured.

The main piston 22 is positioned at the forwardmost position corresponding to the trigger portion 21 being at the forwardmost swing position. At this time, the main piston 22 closes the first ventilation hole 23b formed in the main cylinder 23 between the pair of front and rear outer lip portions 22d. Then, when the main piston 22 moves rearward from the forwardmost position by a predetermined amount due to the rearward swinging of the trigger portion 21, the main piston 22 opens the first air hole 23b.

As a result, the first vent hole 23b is opened to the outside of the trigger type liquid ejector 1 through the interior of the main cylinder 23 . The first vent hole 23b communicates with the inside of the container A through various gaps and various vent holes (first gap S1, second vent hole 15a, second gap S2, and third vent hole 10a). , the inside of the container body A from which the liquid has been ejected can be replaced with air. The first gap S<b>1 is an annular gap formed between the inner peripheral surface of the cylinder tubular portion 15 and the outer peripheral surface of the main cylinder 23 . The second ventilation hole 15a is a through hole formed in the peripheral wall of the cylinder tube portion 15 and extends downward from the lower portion of the first gap S1. The second clearance S2 is a clearance formed between the lower surface of the cylinder tube portion 15 and the upper surface of the inner cylinder-side collar portion 10A of the vertical supply cylinder portion 10, and communicates with the lower end of the second ventilation hole 15a. ing. In addition, as shown in FIG. 1, a mounting cap 11 is engaged with the inner cylinder-side flange portion 10A. The third ventilation hole 10a is a through hole that vertically penetrates the inner cylinder side collar portion 10A, and allows the second gap S2 and the inside of the container body A to communicate with each other.

The restricting member 100 includes a restricting piece 103 that abuts against the lip connecting portion 22c in the longitudinal direction to restrict the forward removal of the main piston 22. As shown in FIG. As shown in the rear view of the regulating member 100 in FIG. 3, a plurality of regulating pieces 103 (in this embodiment, two regulating pieces 103 at 180° intervals around the axis O2) are provided at intervals in the circumferential direction of the inner cylindrical portion 102. It is As shown in FIG. 2, the restricting piece 103 protrudes rearward from the inner peripheral surface of the rear end portion of the inner tubular portion 102 . The outer peripheral surface side of the rear end portion of the restricting piece 103 is tapered toward the rear. A rear end surface of the restricting piece 103 is a plane parallel to the lip connecting portion 22c and faces the lip connecting portion 22c in the front-rear direction.

(Action of trigger-type liquid ejector)
Next, the case of using the trigger type liquid ejector 1 configured as described above will be described. It is assumed that each part of the trigger type liquid ejector 1 is filled with liquid by operating the trigger part 21 a plurality of times, and the liquid can be sucked up into the vertical supply tube part 10 .

After removing the stopper T, the user pulls the trigger part 21 backward against the biasing force of the piston biasing member 24 . Then, the main piston 22 moves rearward from the forwardmost position, and the inside of the main cylinder 23 is pressurized. Thereby, the liquid in the main cylinder 23 is supplied to the vertical supply tube portion 10 . Then, the liquid supplied to the vertical supply tubular portion 10 pushes the first check valve 13 downward and pushes up the second check valve 14 .

Thereby, the liquid in the vertical supply tube portion 10 can be supplied to the storage space 41 of the storage cylinder 40 through the connection tube portion 30, and the storage space 41 can be pressurized. Therefore, as the storage space 41 is pressurized, the storage plunger 50 can be moved backward from the most advanced position against the biasing force of the plunger biasing member 51, and the liquid is stored in the storage space 41 ( filling).

By moving the storage plunger 50 backward, the liquid in the storage space 41 whose pressure has increased can be guided to the ejection hole 4 through the injection cylinder portion 60 . Then, the liquid can be ejected forward from the ejection holes 4 . In this way, every time the trigger part 21 is pulled backward, the liquid can be ejected from the ejection hole 4 and the liquid can be stored in the storage space 41 by moving the storage plunger 50 rearward. can.

After that, when the trigger portion 21 is released, the main piston 22 is restored and moved forward in the main cylinder 23 by the elastic restoring force (biasing force) of the piston biasing member 24, so that the trigger portion 21 is also forwardly moved accordingly. Go restore to. Therefore, the pressure in the main cylinder 23 can be reduced to a pressure lower than the pressure in the container body A, so that the first check valve 13 can be opened while the second check valve 14 remains closed. can be raised. Therefore, the liquid in the container body A can be sucked up into the vertical supply tubular portion 10 and introduced into the main cylinder 23 .
This makes it possible to prepare for the next ejection.

When the rearward operation of the trigger portion 21 is stopped, the supply of the liquid to the storage space 41 through the vertical supply cylinder portion 10 and the connection cylinder portion 30 is stopped, but the urging force of the plunger urging member 51 causes the liquid to be stored. Plunger 50 begins to move forward toward the most advanced position. At this time, the outflow of the liquid from the storage space 41 into the vertical supply tubular portion 10 is restricted by the second check valve 14 .

As a result, the liquid accumulated in the storage space 41 can be guided to the ejection hole 4 through the ejection cylinder portion 60 and the liquid can be continuously ejected forward through the ejection hole 4 .
Thus, the liquid can be ejected not only when the trigger part 21 is pulled backward, but also when the trigger part 21 is not operated, and the liquid can be continuously ejected.

According to the trigger type liquid ejector 1 configured as described above, when the trigger mechanism 20 is operated to move the trigger portion 21 rearward, the main cylinder 23 is pressurized due to the retreat of the main piston 22, and the pressure inside the main cylinder 23 is increased. The liquid flows from inside the vertical supply tube portion 10 toward the ejection hole 4 side. As a result, the liquid can be ejected forward through the ejection holes 4 of the nozzle member 3 . Further, when the operation of the trigger mechanism 20 is stopped, since the piston biasing member 24 that biases the main piston 22 forward is provided in the main cylinder 23, the main piston 22 advances together with the trigger portion 21. The inside of the main cylinder 23 can be decompressed and the liquid can be sucked up from inside the container body A. Here, a restricting member 100 is fitted to the main cylinder 23, and the restricting member 100 directly restricts the main piston 22 from coming off forward. Therefore, even if the trigger portion 21 is not yet assembled, the forward movement of the main piston 22 can be reliably restricted.

That is, when the biasing force of the piston biasing member 24 is increased in order to strengthen the suction of the liquid into the main cylinder 23, the main piston 22 tries to move forward, and when the movement is restricted only by the trigger part 21, the trigger part 21 It cannot be completely regulated because it depends on the assembly accuracy and deformation of the device. If the main piston 22 moves forward beyond its designed forwardmost position, there is a risk of liquid leakage. Also, if the main piston 22 moves forward beyond its designed forwardmost position, the main piston 22 may not move back to its designed rearwardmost position when the trigger portion 21 is pulled. . Furthermore, when the outer lip portion 22d passes through the first ventilation hole 23b for air replacement due to the forward movement of the main piston 22, liquid enters the first ventilation hole 23b, and the operation of pulling the trigger portion 21 is required. When this happens, the infiltrated liquid may flow back and spurt out. In order to suppress such a risk, in the present embodiment, a ring-shaped restricting member 100 is fitted to the flange 23a of the main cylinder 23 to directly press the main piston 22 to reliably restrict its forward movement. there is Further, by fitting the restricting member 100, the main cylinder 23, the piston urging member 24, the main piston 22, and the restricting member 100 can be unitized and assembled in advance, so that the attachment to the ejector main body 2 is easy. become.

As described above, the trigger-type liquid ejector 1 according to the present embodiment described above includes the ejector main body 2 attached to the container body A containing the liquid, and the ejector main body 2 disposed on the front side of the ejector main body 2 to and a nozzle member 3 formed with an ejection hole 4 for ejecting liquid forward. A trigger portion 21 is provided in front of the supply tube portion 10 so as to be movable rearward in a forward biased state, and the liquid is ejected from the vertical supply tube portion 10 to the ejection holes 4 by moving the trigger portion 21 rearward. The trigger mechanism 20 includes a main piston 22 that moves back and forth with the movement of the trigger part 21, and the inside of the trigger mechanism 20 is pressurized and decompressed with the movement of the main piston 22. a main cylinder 23 whose interior communicates with the vertical supply tube portion 10; a piston biasing member 24 disposed inside the main cylinder 23 and biasing the main piston 22 forward; and a restricting member 100 that is fitted and restricts the main piston 22 from coming off forward.
According to this configuration, the forward movement of the main piston 22 can be restricted without depending on the assembled state of the trigger portion 21 .

In this embodiment, a guide cylinder 25 is provided inside the main cylinder 23 to guide the main piston 22 in the front-rear direction. , an outer lip portion 22d that slides on the inner wall surface of the main cylinder 23, and a lip connecting portion 22c that connects the inner lip portion 22b and the outer lip portion 22d. A restricting piece 103 is provided for restricting forward removal of the main piston 22 by coming into contact with the main piston 22 . According to this configuration, the regulating piece 103 of the regulating member 100 directly abuts the lip connecting portion 22c connecting the inner lip portion 22b and the outer lip portion 22d of the main piston 22 in the front-rear direction. Also, the forward movement of the main piston 22 can be restricted while preventing the outer lip portion 22d from being deformed. Therefore, the slidability and sealability of the main piston 22 with respect to the guide tube 25 and the main cylinder 23 can be ensured.

Further, in this embodiment, the restricting member 100 includes an outer cylindrical portion 101 that fits on the main cylinder 23, and is connected to the outer cylindrical portion 101 and inserted into the inner wall of the main cylinder 23. and a pair of grooves 107 formed on the outer peripheral surface of the inner tubular portion 102 and extending in the front-rear direction. According to this configuration, the outer cylindrical portion 101 of the regulating member 100 is fitted onto the main cylinder 23 , so mounting of the regulating member 100 on the main cylinder 23 is facilitated. In addition, the inner cylindrical portion 102 of the regulating member 100 is inserted inside the main cylinder 23 and arranged with a gap from the entire circumference of the inner wall surface of the main cylinder 23, and the outer peripheral surface of the inner cylindrical portion 102 Since a pair of grooves extending in the front-rear direction is formed, the inner cylindrical portion 102 can be inserted to a predetermined position in the main cylinder 23 without depending on the dimensional accuracy of the inner wall surface of the main cylinder 23, and the main piston 22 can be moved. You can control your progress.

Further, in this embodiment, the piston biasing member 24 is a metal spring, and the ejector main body 2 moves the liquid that has passed through the vertical supply tube portion 10 from the main cylinder 23 by moving the trigger portion 21 rearward. a storage cylinder 40 to be supplied to the inside; The storage plunger 50 moves toward the other side and is biased toward the other side, and when the inside of the main cylinder 23 is pressurized, communication between the inside of the container body A and the inside of the main cylinder 23 through the inside of the vertical supply tube portion 10 is established. A first check valve 13 that shuts off and allows communication between the inside of the container body A and the inside of the main cylinder 23 through the vertical supply tube portion 10 when the inside of the main cylinder 23 is depressurized, and the pressurization inside the main cylinder 23 When the inside of the storage cylinder 40 and the inside of the main cylinder 23 are allowed to communicate with each other through the inside of the vertical supply tube portion 10, and when the inside of the main cylinder 23 is decompressed, the vertical supply tube portion 10 between the inside of the storage cylinder 40 and the inside of the main cylinder 23 is opened. and a second check valve 14 for blocking communication through the inside. According to this configuration, by using a metal spring as the piston biasing member 24, the suction of the liquid into the main cylinder 23 can be strengthened. Further, the first check valve 13 and the second check valve 14 allow the liquid to be ejected through the ejection holes 4 while supplying the liquid from the main cylinder 23 through the vertical supply cylinder portion 10 into the storage cylinder 40 and to store the liquid. The inside of the cylinder 40 can be pressurized. Therefore, the storage plunger 50 can be pushed toward one side in the axial direction against the forward bias, and the storage plunger 50 can be moved toward the one side in the axial direction while ejecting the liquid. Therefore, every time the trigger part 21 is pulled, the storage plunger 50 is moved to one side in the axial direction, and the liquid can be ejected while the storage cylinder 40 is being filled with liquid. When the operation of the trigger portion 21 is stopped after the storage cylinder 40 is filled with the liquid, the supply of the liquid into the storage cylinder 40 through the vertical supply cylinder portion 10 is stopped. begins to move back towards the other side of the Thereby, the liquid filled in the storage cylinder 40 can be pushed out from the storage cylinder 40 toward the ejection hole 4 side, and can be ejected from the ejection hole 4 . Therefore, it is possible to continuously eject the liquid.

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

For example, a modified example as shown in FIG. 4 may be adopted. The restricting member 100 shown in FIG. 4 abuts on the front outer lip portion 22d of the pair of front and rear outer lip portions 22d in the front-rear direction to restrict the main piston 22 from coming off forward. As shown in the rear view of FIG. 5, the regulating member 100 is configured so that the rear end portion formed continuously over the entire circumference of the inner cylinder portion 102 also serves as the regulating piece 103 . Even with the above configuration, the forward movement of the main piston 22 can be restricted without depending on the assembled state of the trigger portion 21 .
Further, the restricting piece 103 shown in FIG. 2 may be configured to be spaced radially inward from the inner peripheral surface of the outer lip portion 22d so as to contact only the lip connecting portion 22c.
Also, the regulating member 100 does not have to be ring-shaped.

Moreover, the storage cylinder 40 and the storage plunger 50 may be omitted. The trigger type liquid ejector 1 does not have to assume continuous ejection.

In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1... Trigger-type liquid ejector, 2... Ejector main body, 3... Nozzle member, 4... Ejection hole, 5... Cover member, 10... Vertical supply cylinder part, 10a... Third ventilation hole, 11... Mounting cap, 12... Pipe 13... First check valve 14... Second check valve 15... Cylindrical part 15a... Second vent hole 16... Fitting tube part 20... Trigger mechanism 21... Trigger part 22 Main piston 22a Piston main body 22b Inner lip portion 22c Lip connecting portion 22d Outer lip portion 23 Main cylinder 23a Flange 23b First ventilation hole 24 Piston biasing member , 25... Guide tube 25a... Recessed portion 30... Connection tube part 31... Obstruction plug 40... Storage cylinder 41... Storage space 50... Storage plunger 51... Plunger biasing member 60... Ejection cylinder part DESCRIPTION OF SYMBOLS 100... Regulating member 101... Outer cylinder part 102... Inner cylinder part 103... Regulating piece 104... Fitting piece 105... Annular connection part 106... Through hole 107... Groove part A... Container body O1... Axis line, O2... axis line, S1... first gap, S2... second gap, T... stopper

Claims (4)

an ejector body attached to a container body containing a liquid;
a nozzle member disposed on the front side of the ejector body and formed with an ejection hole for ejecting the liquid forward;
The ejector body is
a vertical supply tube portion that extends in the vertical direction and sucks up the liquid in the container body;
A trigger portion is provided in front of the vertical supply tube portion so as to be movable rearward in a forwardly biased state, and the liquid is moved from the vertical supply tube portion to the ejection hole side by moving the trigger portion rearward. and a trigger mechanism that circulates toward
The trigger mechanism is
a main piston that moves back and forth as the trigger portion moves;
a main cylinder whose interior is pressurized and depressurized as the main piston moves and whose interior communicates with the vertical supply cylinder;
a biasing member disposed inside the main cylinder and biasing the main piston forward;
A trigger-type liquid ejector, comprising: a restricting member that fits into the main cylinder and restricts forward withdrawal of the main piston. A guide tube for guiding the main piston in the front-rear direction is provided inside the main cylinder,
The main piston includes an inner lip portion in sliding contact with the outer wall surface of the guide cylinder, an outer lip portion in sliding contact with the inner wall surface of the main cylinder, and a lip connecting portion connecting the inner lip portion and the outer lip portion. , and
2. The trigger-type liquid ejector according to claim 1, wherein said restricting member includes a restricting piece that abuts against said lip connecting portion in the front-rear direction and restricts forward removal of said main piston. The regulation member is
an outer cylindrical portion that fits onto the main cylinder;
an inner cylindrical portion connected to the outer cylindrical portion and inserted into the inner side of the main cylinder and arranged with a gap from the entire circumference of the inner wall surface of the main cylinder;
3. The trigger-type liquid ejector according to claim 1, further comprising a pair of grooves formed on the outer peripheral surface of said inner cylindrical portion and extending in the front-rear direction. The biasing member is a metal spring,
The ejector body is
a storage cylinder into which the liquid that has passed through the vertical supply cylinder portion from the main cylinder is supplied by rearward movement of the trigger portion;
It is disposed in the storage cylinder so as to be movable in the axial direction along the central axis thereof, and moves in one axial direction and in the other axial direction as liquid is supplied into the storage cylinder. a reservoir plunger biased toward;
When the inside of the main cylinder is pressurized, communication between the container body and the inside of the main cylinder through the vertical supply cylinder portion is cut off, and when the inside of the main cylinder is decompressed, the communication between the container body and the inside of the main cylinder is cut off. a first check valve that allows communication through the vertical supply cylinder;
When pressurizing the inside of the main cylinder, communication between the inside of the storage cylinder and the inside of the main cylinder is permitted through the inside of the vertical supply cylinder portion, and when the inside of the main cylinder is decompressed, the inside of the storage cylinder and the inside of the main cylinder are allowed to communicate. 4. The trigger-type liquid ejector according to any one of claims 1 to 3, further comprising a second check valve that cuts off the communication through the vertical supply tube portion of the.

Images