Trigger-type liquid ejector

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

[Technical field]

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

[0002] There is known a trigger type liquid ejector that sucks up liquid from a container by operating a trigger part and ejects the liquid through an ejection hole. The trigger type liquid ejector described in the following Patent Document 1 includes a piston that moves back and forth with the movement of the trigger part, a cylinder whose inside is pressurized and depressurized with the movement of the piston and whose inside is connected to the inside of the vertical supply tube part, and a biasing member that is arranged inside the cylinder and biases the piston forward. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-159841 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional trigger-type liquid ejectors, the front end of the piston is abutted against the trigger part so that the piston, which is biased forward by a biasing member, does not slip forward from the cylinder. However, before the trigger part is assembled, the forward movement of the piston cannot be restricted, and if the assembly precision of the trigger part varies or is deformed, the piston may advance beyond the designed forward most position, which may cause liquid leakage. Furthermore, if the piston advances beyond the designed forward most position, the piston may not retract to the designed rearmost position when the trigger part is pulled.

[0005] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a trigger-type liquid ejector that can regulate the forward movement of the piston regardless of the assembly state of the trigger portion. [Means for solving the problem]

[0006] (1) A trigger-type liquid ejector according to the present invention comprises a ejector body attached to a container body containing liquid, and a nozzle member arranged on the front side of the ejector body and having an ejection hole formed therein for ejecting liquid forward. The ejector body extends in the vertical direction and has a vertical supply tube section that sucks up the liquid in the container body, and a trigger mechanism having a trigger section arranged in front of the vertical supply tube section so as to be able to move rearward in a forward biased state, the trigger mechanism causing liquid to flow from within the vertical supply tube section towards the ejection hole side by moving the trigger section rearward. The trigger mechanism comprises a main piston that moves back and forth with the movement of the trigger section, a main cylinder whose interior is pressurized and depressurized with the movement of the main piston and whose interior is connected to the inside of the vertical supply tube section, a biasing member arranged inside the main cylinder that biases the main piston forward, and a regulating member that fits into the main cylinder and regulates the main piston from slipping out forward.

[0007] According to the trigger type liquid ejector of the present invention, when the trigger mechanism is operated to move the trigger part backward, the main piston retracts, pressurizing the inside of the main cylinder, and the liquid in the main cylinder flows from the vertical supply tube part toward the ejection hole side. This allows the liquid to be ejected forward through the ejection hole of the nozzle member. Furthermore, when the operation of the trigger mechanism is stopped, a biasing member that biases the main piston forward is provided in the main cylinder, so that the main piston advances together with the trigger part to reduce the pressure in the main cylinder and to suck up the liquid from the container body. Here, a restricting member is fitted into the main cylinder, and the restricting member restricts the main piston from slipping out forward. Therefore, even if the trigger part is not yet assembled, the advancement of the main piston can be reliably restricted. Furthermore, the main cylinder, the biasing member, the main piston, and the restricting member can be assembled in advance as a unit, making it easy to assemble them into the ejector body.

[0008] (2) A guide tube is provided inside the main cylinder to guide the main piston in a forward / rearward direction, and the main piston has an inner lip portion in sliding contact with an outer wall surface of the guide tube, an outer lip portion in sliding contact with an inner wall surface of the main cylinder, and a lip connecting portion connecting the inner lip portion and the outer lip portion, and the regulating member may have a regulating piece that abuts against the lip connecting portion in the forward / rearward direction to regulate the main piston from slipping out forward.

[0009] In this case, the restricting piece of the restricting member directly contacts in the front-rear direction with the lip connecting portion that connects the inner lip portion and the outer lip portion of the main piston, thereby restricting the forward movement of the main piston while preventing deformation of the inner lip portion and the outer lip portion, thereby ensuring the sliding and sealing properties of the main piston with respect to the guide tube and the main cylinder.

[0010] (3) The regulating member may include an outer tube portion that fits around the main cylinder, an inner tube portion that is connected to the outer tube portion and inserted inside the main cylinder and arranged with a gap around the entire circumference of the inner wall surface of the main cylinder, and a pair of groove portions that are formed on the outer peripheral surface of the inner tube portion and extend in the front-to-rear direction.

[0011] In this case, the outer tubular portion of the regulating member fits onto the main cylinder, making it easy to attach the regulating member to the main cylinder. Also, since the inner tubular portion of the regulating member is inserted into the inside of the main cylinder and is disposed with a gap around the entire circumference of the inner wall surface of the main cylinder, and a pair of grooves extending in the front-rear direction are formed on the outer circumferential surface of the inner tubular portion, the inner tubular portion can be inserted to a predetermined position in the main cylinder to regulate the forward movement of the main piston without depending on the dimensional accuracy of the inner wall surface of the main cylinder.

[0012] (4) The biasing member may be a metal spring, and the ejector body may include a storage cylinder into which liquid that has passed through the vertical supply tube portion from the main cylinder is supplied as the trigger portion moves rearward, a storage plunger that is arranged in the storage cylinder so as to be movable in the axial direction along its central axis, and that moves toward one side in the axial direction and is biased toward the other side as liquid is supplied into the storage cylinder, a first check valve that blocks communication between the inside of the container body and the inside of the main cylinder through the vertical supply tube portion when the main cylinder is pressurized, and allows communication between the inside of the container body and the inside of the main cylinder through the vertical supply tube portion when the main cylinder is depressurized, and a second check valve that allows communication between the inside of the storage cylinder and the inside of the main cylinder through the vertical supply tube portion when the main cylinder is pressurized, and blocks communication between the inside of the storage cylinder and the inside of the main cylinder through the vertical supply tube portion when the main cylinder is depressurized.

[0013] In this case, the force member is a metal spring, which can 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 into the storage cylinder through the vertical supply tube portion, while the liquid can be ejected through the ejection hole and the inside of the storage cylinder can be pressurized. Therefore, the storage plunger can be pressed toward one side in the axial direction against the forward force, and the storage plunger can be moved toward one side in the axial direction while ejecting the liquid. Therefore, every time the trigger portion is pulled, the storage plunger can be moved toward one side in the axial direction, and the liquid can be ejected while storing (filling) the liquid in the storage cylinder. Note that, when the operation of the trigger portion is stopped after the liquid is filled into the storage cylinder, the supply of the liquid into the storage cylinder through the vertical supply tube portion is stopped, but the storage plunger begins to move back toward the other side in the axial direction. This allows the liquid filled in the storage cylinder to be pushed out from the storage cylinder toward the ejection hole side and ejected from the ejection hole. Therefore, it is possible to perform continuous ejection of liquid. Effect of the Invention

[0014] According to the trigger type liquid ejector of the present invention, the forward movement of the main piston can be restricted regardless of the assembled state of the trigger portion. [Brief description of the drawings]

[0015] [Figure 1] 1 is a vertical cross-sectional view showing a trigger type liquid ejector according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an enlarged view showing a main part of a trigger mechanism according to an embodiment of the present invention. [Diagram 3] FIG. 4 is a rear view showing the restricting member according to the embodiment of the present invention. [Figure 4] FIG. 11 is a vertical cross-sectional view showing a modified example of a trigger type liquid ejector according to an embodiment of the present invention. [Diagram 5] FIG. 11 is a rear view showing a modified example of the restricting member according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A trigger type liquid ejector according to an embodiment of the present invention will be described below with reference to the drawings. In the following description, a ejection container having a trigger type liquid ejector attached to a container body will be illustrated.

[0017] As shown in Figure 1, the trigger-type liquid ejector 1 of this embodiment comprises a ejector body 2 which is attached to a container body A which contains liquid, a nozzle member 3 which is attached to the ejector body 2 and has an ejection hole 4 for ejecting the liquid, and a cover member 5 which covers the ejector body 2 and the nozzle member 3. Unless otherwise specified, each component part of the trigger type liquid ejector 1 is a molded product made of synthetic resin.

[0018] The ejector 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 ejection tube portion 60 . In the following description, the central axis of the vertical supply tube portion 10 is defined as axis O1, the side of the container body A along this axis O1 is defined as the lower side, the opposite side is defined as the upper side, and the direction along axis O1 is defined as the up-down direction. In addition, in a plan view seen from the up-down direction, a direction intersecting axis O1 is defined as the front-rear direction, and a direction perpendicular to both the up-down direction and the front-rear direction is defined as the left-right direction.

[0019] Furthermore, the central axis of the storage cylinder 40 is 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 corresponds to one side of the axial direction along the central axis of the storage cylinder 40, and the front 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.

[0020] The vertical supply tube section 10 extends in the vertical direction and sucks up the liquid in the container body A. The vertical supply tube section 10 is attached to the container body A by an attachment cap 11. The upper part of a pipe 12 that extends in the vertical direction and sucks up the liquid from the container body A is fitted into the vertical supply tube section 10. A first check valve 13 and a second check valve 14 are provided above the fitting position of the pipe 12 inside the vertical supply tube section 10.

[0021] The first check valve 13 blocks communication between the inside of the container body A and the inside of the main cylinder 23 through the vertical supply tube section 10 when pressure is applied inside the main cylinder 23 of the trigger mechanism 20, and allows communication between the inside of the container body A and the inside of the main cylinder 23 through the vertical supply tube section 10 by displacing upward when pressure is reduced inside the main cylinder 23.

[0022] A second check valve 14 is disposed above the first check valve 13. The second check valve 14 allows the liquid to be supplied from inside the vertical supply tube portion 10 to inside the storage cylinder 40, and regulates the outflow of liquid from inside the storage cylinder 40 to inside the vertical supply tube portion 10.

[0023] 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 into the cylinder tube portion 15. The main cylinder 23 is formed in a bottomed cylindrical shape that opens forward and is closed at the rear. A portion of the rear wall of the main cylinder 23 is in spatial communication with the first check valve 13 and the second check valve 14 in the vertical supply tube portion 10.

[0024] 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 is capable of circulating the liquid from inside the vertical supply tube portion 10 toward the nozzle hole 4 by the rearward movement of the trigger portion 21.

[0025] The trigger portion 21 is disposed in front of the vertical supply tube portion 10 so as to be movable rearward in a forward biased state. The trigger portion 21 is journaled to the nozzle member 3 below the injection tube portion 60 so as to be swingable in the front-rear direction. The trigger portion 21 extends downward from the journaled position by the nozzle member 3, and is located in front of the main piston 22 and the main cylinder 23.

[0026] In this embodiment, a stopper T is detachably provided in the gap in the front-rear direction between the trigger portion 21 and the main cylinder 23. The stopper T restricts the rearward swing of the trigger portion 21 by abutting against both the trigger portion 21 and the main cylinder 23. The stopper T may be in a detached state.

[0027] The main piston 22 is disposed 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 topped cylindrical shape that is open to the rear and closed at the front.

[0028] The main piston 22 is urged forward together with the trigger portion 21 by the urging force of the piston urging member 24. As the trigger portion 21 moves rearward, the main piston 22 moves backward and is pushed into the main cylinder 23. When the trigger portion 21 is in the forwardmost swing position, the main piston 22 is located in the corresponding forwardmost position.

[0029] The piston biasing member 24 is a metal spring. The piston biasing member 24 is disposed coaxially with the main piston 22 and the main cylinder 23, and biases the trigger portion 21 forward via the main piston 22. The piston biasing member 24 is disposed between the top wall of the main piston 22 and the bottom wall of the main cylinder 23. Note that 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.

[0030] The connecting tube portion 30 is disposed above the cylinder tube portion 15. The connecting tube portion 30 extends forward from the upper end of the vertical supply tube portion 10. The inside of the connecting tube portion 30 is connected to the upper side of the closed position of the second check valve 14 in the vertical supply tube portion 10. A blocking plug 31 is fitted to the front end of the connecting tube portion 30. The liquid flowing forward inside the connecting tube portion 30 turns upward when it hits the blocking plug 31, and flows into the storage cylinder 40 through the gap between the blocking plug 31 and the upper end of the connecting tube portion 30.

[0031] The storage cylinder 40 is disposed above the vertical supply tube portion 10 and the connecting tube portion 30. In this embodiment, the lower end portion of the storage cylinder 40 is integrally formed with the upper end portion of the vertical supply tube portion 10 and the upper end portion of the connecting tube portion 30. The liquid that has passed through the vertical supply tube portion 10 and the connecting tube portion 30 is supplied to the inside of the storage cylinder 40 (storage space 41) by the rearward movement of the trigger portion 21.

[0032] The storage plunger 50 is disposed in the storage cylinder 40 so as to be movable in the front-rear direction along the axis O2. The storage plunger 50 slides in the front-rear direction in the storage cylinder 40. At the forward-most position, the storage plunger 50 blocks communication between the interior of the vertical supply tube section 10 and the ejection hole 4 (inside the injection tube section 60). When the storage plunger 50 moves rearward from the forward-most position, the storage plunger 50 connects the interior of the vertical supply tube section 10 to the ejection hole 4 (inside the injection tube section 60). In the storage cylinder 40, the space located forward of the storage plunger 50 functions as a storage space 41.

[0033] The storage space 41 stores the liquid that has passed through the vertical supply tube portion 10. 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 liquid is supplied into the storage cylinder 40. The storage space 41 communicates with the interior of the vertical supply tube portion 10 through the connecting tube portion 30. The storage space 41 can also communicate with the interior of the injection tube portion 60. When the storage plunger 50 is in the forwardmost position, the storage space 41 is cut off from communication with the interior of the injection tube portion 60. When the storage plunger 50 retracts from the forwardmost position, the storage space 41 communicates with the interior of the injection tube portion 60.

[0034] 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 disposed behind the storage plunger 50 in the storage cylinder 40. In an initial state before the user operates the trigger portion 21, the plunger biasing member 51 biases the storage plunger 50 forward, so that the storage plunger 50 is located at the frontmost position. The plunger biasing member 51 is a metal coil spring disposed coaxially with the axis O2. However, for example, a resin spring or other elastic members may be used as the plunger biasing member 51.

[0035] The liquid is pressurized in the storage space 41 of the storage cylinder 40 until the storage plunger 50 moves rearward. When the liquid pressure in the storage space 41 reaches a predetermined value, the storage plunger 50 moves rearward against the plunger biasing member 51. This makes it possible to supply the liquid in the storage space 41 to the ejection hole 4 side. The storage plunger 50 functions as a pressure accumulator valve.

[0036] The injection tube portion 60 extends forward from the storage cylinder 40. The injection tube portion 60 is connected to the inside of the vertical supply tube portion 10 through the inside of the storage cylinder 40 (storage space 41) and the inside of the connecting tube portion 30. The injection tube portion 60 guides liquid that has passed through the inside of the vertical supply tube portion 10, the inside of the connecting tube portion 30, and the inside of the storage cylinder 40 (storage space 41) to the ejection hole 4. The nozzle member 3 is fitted from the front onto the injection tube portion 60. The nozzle member 3 is formed with an ejection hole 4 that opens forward and ejects liquid forward.

[0037] The cover member 5 is formed so as to cover the entire vertical supply tube portion 10 except for the lower end portion, the entire injection tube portion 60, and the entire storage cylinder 40 from at least both left and right sides and above.

[0038] The trigger type liquid ejector 1 having the above-mentioned configuration includes a restricting member 100 that fits into the main cylinder 23 and restricts the main piston 22 from slipping out forward. As shown in the enlarged view of Fig. 2, the restricting member 100 includes an outer cylinder portion 101 that fits onto the main cylinder 23, an inner cylinder portion 102 that is connected to the outer cylinder portion 101 and inserted into the main cylinder 23 and disposed with a gap around the entire circumference of the inner wall surface of the main cylinder 23, and a restricting piece 103 that protrudes rearward from the inner cylinder portion 102.

[0039] A fitting piece 104 is provided to protrude 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 the fitting pieces 104 (four fitting pieces at 90° intervals around the axis O2 in this embodiment) are provided at intervals in the circumferential direction of the outer cylindrical portion 101. As shown in Fig. 2, the fitting piece 104 abuts against a flange 23a provided at the front end opening of the main cylinder 23 from behind.

[0040] The outer diameter of the flange 23a is the same as the outer diameter of the cylinder tubular portion 15. The flange 23a is disposed with a gap in the front-rear direction from the front end opening edge of the cylinder tubular portion 15. The fitting piece 104 is disposed so as to fit in the gap between the flange 23a and the front end opening edge of the cylinder tubular portion 15. In this way, by providing a gap between the flange 23a and the front end opening edge of the cylinder tubular 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 tubular portion 15 can be minimized.

[0041] The front end of the outer cylinder portion 101 and the front end of the inner cylinder portion 102 are connected by an annular connecting portion 105. The annular connecting portion 105 abuts from the front against 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.

[0042] The inner cylinder portion 102 extends rearward from the radially inner end edge of the annular connecting portion 105. The outer peripheral surface of the inner cylinder portion 102 is disposed with a gap relative to the entire circumference of the inner wall surface of the main cylinder 23. In other words, the inner cylinder portion 102 is suspended from the outer cylinder 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 cylinder portion 102 is slightly reduced in diameter in accordance with the shape of the inner wall surface of the main cylinder 23.

[0043] 3, a pair of grooves 107 extending in the front-rear direction are formed on the outer circumferential surface of the inner cylindrical portion 102. The pair of grooves 107 are formed to a constant depth on the top and bottom of the outer circumferential surface of the inner cylindrical portion 102. The pair of grooves 107 extend to the surface facing rearward of the annular connecting portion 105, and also extend to the through holes 106 arranged above and below.

[0044] 2, the main cylinder 23 is a cylindrical cylinder with a bottom that opens forward, and is provided with a cylindrical guide tube 25 that protrudes forward from the center of the rear wall. The guide tube 25 is formed in a cylindrical shape with a bottom that opens forward and is closed at the rear. The front end of the guide tube 25 is located rearward of the front end of the main cylinder 23.

[0045] The bottom 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. The front end portion of the fitting tube portion 16 protrudes into the guide tube 25. The guide tube 25 is disposed coaxially with the fitting tube portion 16. An annular recess portion 25a is formed on the outer circumferential surface at the rear end portion of the guide tube 25.

[0046] The main piston 22 comprises a piston body portion 22a that opens to the rear and has a guide tube 25 inserted therein, an inner lip portion 22b that is provided at the rear end of the piston body portion 22a and slides against the outer wall surface of the guide tube 25, a lip connecting portion 22c that protrudes radially outward from the rear end of the piston body portion 22a, and a pair of front and rear outer lip portions 22d that are connected radially outward from the lip connecting portion 22c and slide against the inner wall surface of the main cylinder 23.

[0047] The piston body 22a is formed in a cylindrical shape with an open rear end and a closed front end. The inner diameter of the piston body 22a is formed slightly larger than the outer diameter of the guide tube 25. The front end of the piston body 22a is engaged with the trigger portion 21 (see FIG. 1) by abutting against the trigger portion 21 from the rear of the trigger portion 21.

[0048] An annular inner lip portion 22b is formed at the rear end of the piston body portion 22a, protruding radially inward and in sliding contact with the outer wall surface of the guide tube 25. This ensures sealing between the inner lip portion 22b and the outer wall surface of the guide tube 25. The inner lip portion 22b reaches the recessed portion 25a when the main piston 22 is located at the rearmost position.

[0049] When the inner lip portion 22b reaches the recessed portion 25a of the guide tube 25, a small gap is formed between the inner lip portion 22b and the recessed portion 25a. Through this gap, the inside of the main cylinder 23 communicates with the gap between the inner peripheral surface of the piston body portion 22a and the outer wall surface of the guide tube 25. 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.

[0050] The lip connecting portion 22c is formed in an annular shape that connects the inner lip portion 22b and the outer lip portion 22d in the radial direction. The surface of the lip connecting portion 22c facing forward is flat. The outer lip portion 22d is formed in a pair, front and rear, with the diameters increasing separately from the outer peripheral end of the lip connecting portion 22c toward the front and rear, and is in sliding contact with the inner wall surface of the main cylinder 23. This ensures sealing between the outer lip portion 22d and the inner wall surface of the main cylinder 23.

[0051] When the trigger portion 21 is in the forward-most swing position, the main piston 22 is located in the forward-most position corresponding thereto. At this time, the main piston 22 closes the first air 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 by a predetermined amount from the forward-most position due to the rearward swing of the trigger portion 21, the main piston 22 opens the first air hole 23b.

[0052] As a result, the first vent hole 23b is opened to the outside of the trigger-type liquid ejector 1 through the main cylinder 23. The first vent hole 23b is connected to the inside of the container body A through various gaps and various vent holes (the first gap S1, the second vent hole 15a, the second gap S2, and the third vent hole 10a), so that the inside of the container body A from which the liquid has been ejected can be replaced with air. The first gap S1 is an annular gap formed between the inner peripheral surface of the cylinder tube portion 15 and the outer peripheral surface of the main cylinder 23. The second vent hole 15a is a through hole formed in the peripheral wall of the cylinder tube portion 15, and extends downward from the lower part of the first gap S1. The second gap S2 is a gap formed between the lower surface of the cylinder tube portion 15 and the upper surface of the inner tube side flange portion 10A of the vertical supply tube portion 10, and is connected to the lower end of the second vent hole 15a. 1, an attachment cap 11 is engaged with the inner tube flange 10A. The third air hole 10a is a through hole that passes through the inner tube flange 10A in the vertical direction, and connects the second gap S2 with the inside of the container body A.

[0053] The regulating member 100 includes a regulating piece 103 that abuts against the lip connecting portion 22c in the front-rear direction to regulate the main piston 22 from slipping out forward. As shown in the rear view of the regulating member 100 in FIG. 3, a plurality of the regulating pieces 103 (two regulating pieces at 180° intervals around the axis O2 in this embodiment) are provided at intervals in the circumferential direction of the inner cylindrical portion 102. As shown in FIG. 2, the regulating piece 103 protrudes rearward from the inner peripheral surface side at the rear end of the inner cylindrical portion 102. The outer peripheral surface side of the rear end of the regulating piece 103 has a reduced diameter toward the rear. The rear end surface of the regulating piece 103 is a flat surface parallel to the lip connecting portion 22c and faces the lip connecting portion 22c in the front-rear direction.

[0054] (Function of trigger-type liquid ejector) Next, a description will be given of a case where the trigger type liquid ejector 1 configured as described above is used. Note that by operating the trigger part 21 multiple times, each part of the trigger type liquid ejector 1 is filled with liquid, and the liquid can be sucked up into the vertical supply tube part 10.

[0055] After removing the stopper T, the user operates the trigger portion 21 so as to pull it backward against the biasing force of the piston biasing member 24. Then, the main piston 22 moves backward from the frontmost position, and the inside of the main cylinder 23 is pressurized. As a result, the liquid in the main cylinder 23 is supplied to the vertical supply tube portion 10. Then, the liquid supplied to the vertical supply tube portion 10 presses the first check valve 13 downward and pushes the second check valve 14 upward.

[0056] This allows the liquid in the vertical supply tube portion 10 to be supplied to the storage space 41 of the storage cylinder 40 through the connecting 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 rearward from the most forward position against the biasing force of the plunger biasing member 51, and the liquid can be stored (filled) in the storage space 41.

[0057] By moving the storage plunger 50 rearward, the liquid in the storage space 41 where the pressure has increased can be guided to the ejection hole 4 through the injection tube portion 60. Then, the liquid can be ejected forward from the ejection hole 4. In this way, every time the trigger portion 21 is pulled rearward, the liquid can be ejected from the ejection hole 4, and the storage plunger 50 can be moved rearward to store the liquid in the storage space 41.

[0058] Thereafter, when the trigger portion 21 is released, the main piston 22 moves forward in the main cylinder 23 due to the elastic restoring force (biasing force) of the piston biasing member 24, and the trigger portion 21 also moves forward in response to this. Therefore, the pressure inside the main cylinder 23 can be reduced to a pressure lower than the pressure inside the container body A, so that the first check valve 13 can be raised while the second check valve 14 remains closed. Therefore, the liquid inside the container body A can be sucked up into the vertical supply tube portion 10 and introduced into the main cylinder 23. This allows preparation for the next eruption.

[0059] When the operation of the trigger portion 21 toward the rear is stopped, the supply of liquid to the storage space 41 through the vertical supply tube portion 10 and the connecting tube portion 30 is stopped, but the storage plunger 50 starts to move forward toward the most forward position due to the biasing force of the plunger biasing member 51. At this time, the outflow of liquid from the storage space 41 to the vertical supply tube portion 10 is restricted by the second check valve 14.

[0060] This allows the liquid stored in the storage space 41 to be guided through the inside of the ejection tube portion 60 to the ejection hole 4 , and the liquid can be continuously ejected forward through the ejection hole 4 . In this way, liquid can be ejected not only when trigger portion 21 is pulled rearward, but also when trigger portion 21 is not operated, and liquid can be ejected continuously.

[0061] According to the trigger type liquid ejector 1 having the above-mentioned configuration, when the trigger mechanism 20 is operated to move the trigger part 21 backward, the main cylinder 23 is pressurized by the retreat of the main piston 22, and the liquid in the main cylinder 23 flows from the vertical supply tube part 10 toward the ejection hole 4 side. This allows the liquid to be ejected forward through the ejection hole 4 of the nozzle member 3. Furthermore, when the operation of the trigger mechanism 20 is stopped, the main piston 22 advances together with the trigger part 21, since the piston urging member 24 that urges the main piston 22 forward is provided in the main cylinder 23, and the pressure in the main cylinder 23 is reduced, and the liquid can be sucked up from the inside of the container body A. Here, the regulating member 100 is fitted into the main cylinder 23, and the regulating member 100 directly regulates the main piston 22 from slipping out forward. Therefore, even if the trigger part 21 is not yet assembled, the advancement of the main piston 22 can be reliably regulated.

[0062] That is, when the biasing force of the piston biasing member 24 is increased in order to strengthen the suction of liquid into the main cylinder 23, the main piston 22 tries to advance, and when this is restricted only by the trigger part 21, it cannot be completely restricted because it depends on the assembly accuracy and deformation of the trigger part 21. If the main piston 22 advances beyond the designed forward most position, there is a risk of liquid leakage. Also, if the main piston 22 advances beyond the designed forward most position, there is a risk that the main piston 22 will not retract to the designed rearmost position when the trigger part 21 is pulled. Furthermore, if the outer lip part 22d passes through the first vent hole 23b for air replacement due to the forward movement of the main piston 22, liquid may enter the first vent hole 23b, and the liquid may flow back and gush out when the trigger part 21 is pulled. To prevent such a problem, in this embodiment, a ring-shaped regulating member 100 is fitted to the flange 23a of the main cylinder 23 to directly press the main piston 22 and reliably regulate the forward movement. In addition, by fitting the regulating member 100, the main cylinder 23, the piston biasing member 24, the main piston 22, and the regulating member 100 can be assembled in advance as a unit, making it easy to assemble them into the ejector body 2.

[0063] As described above, the trigger type liquid ejector 1 according to the present embodiment includes an ejector body 2 that is attached to a container body A containing liquid, and a nozzle member 3 that is disposed on the front side of the ejector body 2 and has ejection holes 4 formed therein for ejecting the liquid forward. The ejector body 2 extends in the vertical direction and has a vertical supply tube section 10 that sucks up the liquid in the container body A, and a trigger section 21 that is disposed in front of the vertical supply tube section 10 so as to be movable rearward in a forward biased state. The rearward movement of the trigger section 21 ejects the liquid from the vertical supply tube section 10. 0 toward the ejection hole 4 side. The trigger mechanism 20 includes a main piston 22 that moves back and forth with the movement of a trigger portion 21, a main cylinder 23 whose interior is pressurized and depressurized with the movement of the main piston 22 and whose interior is connected to the inside of the vertical supply tube portion 10, a piston biasing member 24 that is disposed inside the main cylinder 23 and biases the main piston 22 forward, and a regulating member 100 that fits into the main cylinder 23 and regulates the main piston 22 from slipping out forward. According to this configuration, the forward movement of the main piston 22 can be restricted regardless of the assembled state of the trigger portion 21.

[0064] In this embodiment, a guide tube 25 is provided inside the main cylinder 23 to guide the main piston 22 in the front-rear direction, the main piston 22 includes an inner lip portion 22b that slides against the outer wall surface of the guide tube 25, an outer lip portion 22d that slides against 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, and the regulating member 100 includes a regulating piece 103 that abuts against the lip connecting portion 22c in the front-rear direction to regulate the main piston 22 from slipping forward. According to this configuration, the regulating piece 103 of the regulating member 100 directly abuts against the lip connecting portion 22c that connects the inner lip portion 22b and the outer lip portion 22d of the main piston 22 in the front-rear direction, thereby regulating the forward movement of the main piston 22 while preventing deformation of the inner lip portion 22b and the outer lip portion 22d. Therefore, the sliding property and sealing property of the main piston 22 with respect to the guide tube 25 and the main cylinder 23 can be ensured.

[0065] Moreover, in this embodiment, the regulating member 100 includes an outer cylinder portion 101 that fits around the main cylinder 23, an inner cylinder portion 102 that is connected to the outer cylinder portion 101 and inserted inside the main cylinder 23 and disposed with a gap from the entire circumference of the inner wall surface of the main cylinder 23, and a pair of grooves 107 that are formed on the outer circumferential surface of the inner cylinder portion 102 and extend in the front-rear direction. According to this configuration, the outer cylinder portion 101 of the regulating member 100 fits around the main cylinder 23, making it easy to attach the regulating member 100 to the main cylinder 23. Furthermore, the inner tube portion 102 of the regulating member 100 is inserted inside the main cylinder 23 and is positioned with a gap relative to the entire circumference of the inner wall surface of the main cylinder 23, and a pair of groove portions extending in the front-to-rear direction are formed on the outer circumferential surface of the inner tube portion 102. Therefore, the inner tube portion 102 can be inserted to a predetermined position within the main cylinder 23 without depending on the dimensional accuracy of the inner wall surface of the main cylinder 23, thereby regulating the forward movement of the main piston 22.

[0066] In this embodiment, the piston biasing member 24 is a metal spring, and the ejector main body 2 includes a storage cylinder 40 into which liquid that has passed through the vertical supply tube portion 10 from the main cylinder 23 is supplied as the trigger portion 21 moves rearward, a storage plunger 50 that is disposed within the storage cylinder 40 so as to be movable in the axial direction along the central axis thereof, and moves toward one side in the axial direction as liquid is supplied into the storage cylinder 40 and is biased toward the other side when the inside of the main cylinder 23 is pressurized. The valve includes a first check valve 13 that blocks 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 and allows 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 when the inside of the main cylinder 23 is depressurized, and a second check valve 14 that allows communication between the inside of the storage cylinder 40 and the inside of the main cylinder 23 through the inside of the vertical supply tube portion 10 when the inside of the main cylinder 23 is pressurized and blocks communication between the inside of the storage cylinder 40 and the inside of the main cylinder 23 through the inside of the vertical supply tube portion 10 when the inside of the main cylinder 23 is depressurized. With this configuration, the piston biasing member 24 is a metal spring, so that the suction of liquid into the main cylinder 23 can be strengthened. In addition, the first check valve 13 and the second check valve 14 allow liquid to be supplied from the main cylinder 23 into the storage cylinder 40 through the vertical supply tube portion 10 while the liquid is ejected through the ejection hole 4, and the inside of the storage cylinder 40 can be pressurized. Therefore, the storage plunger 50 can be pressed toward one side in the axial direction against the forward bias, and the storage plunger 50 can be moved toward one side in the axial direction while ejecting liquid. Therefore, every time the trigger portion 21 is pulled, the storage plunger 50 can be moved toward one side in the axial direction, and the liquid can be ejected while storing (filling) the liquid in the storage cylinder 40. Note that, when the operation of the trigger portion 21 is stopped after the liquid is filled into the storage cylinder 40, the supply of liquid into the storage cylinder 40 through the vertical supply tube portion 10 is stopped, but the storage plunger 50 begins to move back toward the other side in the axial direction. This allows the liquid filled in the storage cylinder 40 to be pushed out from inside the storage cylinder 40 towards the ejection holes 4, and ejected from the ejection holes 4. This makes it possible to perform continuous ejection of the liquid.

[0067] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0068] For example, a modified example as shown in Fig. 4 may be employed. The regulating member 100 shown in Fig. 4 abuts against the front outer lip portion 22d of the pair of front and rear outer lip portions 22d in the front-rear direction to regulate the main piston 22 from slipping out forward. As shown in the rear view of Fig. 5, this regulating member 100 has a rear end portion formed continuously around the entire circumference of the inner cylinder portion 102, which also serves as a regulating piece 103. Even with the above-mentioned configuration, it is possible to regulate the forward movement of the main piston 22 regardless of the assembled state of the trigger portion 21. Furthermore, the restricting piece 103 shown in FIG. 2 may be configured to be spaced radially inward from the inner circumferential surface of the outer lip portion 22d and to abut only against the lip connecting portion 22c. Furthermore, the restricting member 100 does not have to be ring-shaped.

[0069] Furthermore, there may be no need to provide the storage cylinder 40 and the storage plunger 50. The trigger type liquid ejector 1 does not have to be designed for continuous ejection.

[0070] In addition, the components in the above-described embodiments can be replaced with well-known components as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0071] 1... trigger type liquid ejector, 2... ejector body, 3... nozzle member, 4... ejection hole, 5... cover member, 10... vertical supply cylinder portion, 10a... third vent hole, 11... mounting cap, 12... pipe, 13... first check valve, 14... second check valve, 15... cylinder portion, 15a... second vent hole, 16... fitting cylinder portion, 20... trigger mechanism, 21... trigger portion, 22... main piston, 22a... piston body portion, 22b... inner lip portion, 22c... lip connecting portion, 22d... outer lip portion, 23... main cylinder, 23a... flange Lunge, 23b...first vent hole, 24...piston biasing member, 25...guide tube, 25a...recessed portion, 30...connecting tube portion, 31...blocking plug, 40...storage cylinder, 41...storage space, 50...storage plunger, 51...plunger biasing member, 60...injection tube portion, 100...regulating member, 101...outer tube portion, 102...inner tube portion, 103...regulating piece, 104...fitting piece, 105...annular connecting portion, 106...through hole, 107...groove portion, A...container body, O1...axis, O2...axis, S1...first gap, S2...second gap, T...stopper

Claims

1. An ejector body that is attached to a container that contains a liquid; a nozzle member disposed on a front side of the ejector body and having an ejection hole formed therein for ejecting liquid forward; The ejector body includes: A vertical supply tube portion that extends in a vertical direction and sucks up the liquid in the container body; a trigger mechanism including a trigger portion disposed in front of the vertical supply tube portion and movable rearward in a forward biased state, the trigger portion moving rearward to cause liquid to flow from inside the vertical supply tube portion toward the nozzle hole, The trigger mechanism includes: A main piston that moves back and forth with the movement of the trigger portion; a main cylinder whose interior is pressurized and depressurized in accordance with the movement of the main piston and whose interior is in communication with the vertical supply tube portion; a biasing member disposed inside the main cylinder and biasing the main piston forward; a first check valve that blocks communication between the inside of the container body and the inside of the main cylinder through the vertical supply tube portion when the inside of the main cylinder is pressurized, and allows communication between the inside of the container body and the inside of the main cylinder through the vertical supply tube portion when the inside of the main cylinder is depressurized; a second check valve that allows communication between the inside of the main cylinder and the inside of the vertical supply tube portion when the inside of the main cylinder is pressurized and blocks communication between the inside of the main cylinder and the inside of the vertical supply tube portion when the inside of the main cylinder is depressurized; a first vent hole formed in the main cylinder, the first vent hole being open to the outside through the main cylinder, the first vent hole being closed by the main piston positioned at a forward-most position, and being opened when the main piston moves rearward by a predetermined amount from the forward-most position; a restricting member that fits into the main cylinder and restricts the main piston from slipping forward.

2. A guide tube that guides the main piston in the front-rear direction is provided inside the main cylinder, The main piston includes an inner lip portion that is in sliding contact with an outer wall surface of the guide tube, an outer lip portion that is in sliding contact with an inner wall surface of the main cylinder, and a lip connecting portion that connects the inner lip portion and the outer lip portion, 2. The trigger type liquid ejector according to claim 1, wherein the regulating member includes a regulating piece that abuts against the lip connecting portion in the front-rear direction to regulate forward slippage of the main piston.

3. The regulating member is an outer cylinder portion fitted onto the main cylinder; An inner cylinder portion connected to the outer cylinder portion and inserted into the main cylinder, the inner cylinder portion being disposed with a gap therebetween with respect to an entire circumference of an inner wall surface of the main cylinder; The trigger type liquid ejector according to claim 1 or 2, further comprising: a pair of grooves formed on an outer circumferential surface of the inner cylinder portion and extending in the front-rear direction.

4. The biasing member is a metal spring, The ejector body includes: a storage cylinder into which liquid that has passed through the vertical supply tube portion from the main cylinder is supplied as the trigger portion moves rearward; A trigger-type liquid ejector as described in any one of claims 1 to 3, comprising a storage plunger that is arranged in the storage cylinder so as to be movable in an axial direction along its central axis, and that moves toward one side in the axial direction as liquid is supplied into the storage cylinder and is biased toward the other side.

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