Trigger Sprayer

Abstract

To provide a trigger sprayer that can maintain easiness of turning a trigger part for the longest period possible.SOLUTION: A trigger sprayer comprises: a main body part 1 in which a passage 11 through which liquid flows, a cylinder part 13 formed in the passage and a nozzle mouth part 12 positioned at a tip of the passage are formed; a trigger part 2 supported on support shaft parts provided at both sides of the main body part; a piston part 3 connected to the trigger part; and a spring part 4 that energizes the trigger part forward. The piston part slides along an inner wall of the cylinder part, on the basis of turning in a longitudinal direction of the trigger part with the support shaft part as a center. A support hole part, formed in the trigger part, by which the trigger part is mounted thereon has a circular shape in a side view. A cross section orthogonal to an axial direction of the support shaft part is formed in a partially notched circular shape in which at least some arcuate portions of a circle are notched. A space is formed between a peripheral edge of the support hole part and the support shaft part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a trigger sprayer, and more particularly to a trigger sprayer that starts or stops spraying liquid by operating a trigger portion. [Background technology]

[0002] 2. Description of the Related Art A so-called sprayer is known which is attached to a container, sucks up the liquid contained in the container, and sprays (atoms) the liquid. Among sprayers, trigger sprayers are known which are held by hand and spray liquid by operating a trigger portion. Such trigger sprayers are widely used because they allow liquid to be sprayed precisely onto a desired target with a simple finger operation.

[0003] Known examples of such trigger sprayers include trigger-type sprayers in which the trigger part is pulled in and rotated to move the piston part, pressurizing the liquid in the cylinder part and spraying the liquid from the nozzle part connected to the cylinder part (see, for example, Patent Document 1). Also known is a trigger-type sprayer that includes a nozzle portion, a nozzle base portion attached to the nozzle portion, a piston portion attached to the nozzle base portion, a cylinder portion that houses the piston portion, a body portion integrated with the cylinder portion, a cover portion attached to the body portion, and a trigger portion pivotally attached to the body portion; when the trigger portion rotates, the piston portion moves via the nozzle base portion, pressurizing the liquid in the cylinder portion and spraying the liquid from the nozzle portion that communicates with the cylinder portion (see, for example, Patent Document 2).

[0004] In these trigger-type sprayers, a through hole is formed near the upper end of the trigger part, and a cylindrical support shaft, viewed from the side, protrudes from both sides of the body part. The trigger part is pivotally attached to the body part by fitting the support shaft of the body part into the through hole of the trigger part. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-136659 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-137128 Summary of the Invention [Problem to be solved by the invention]

[0006] However, conventional trigger sprayers, including the trigger-type sprayers described in Patent Documents 1 and 2, have the drawback that the ease of rotation of the trigger portion changes with fatigue and deterioration of the components.

[0007] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a trigger sprayer that can maintain the ease of rotation of the trigger portion for as long as possible. [Means for solving the problem]

[0008] The inventors conducted extensive research to solve the above problems and discovered that the above problems could be solved by making the support shaft portion provided on the main body portion partially circular in cross section and making the support hole portion of the trigger portion circular in side view, thereby forming a space between the periphery of the assembled support hole portion and the support shaft portion, thereby completing the present invention.

[0009] The present invention relates to a trigger sprayer that is attached to a container and is used to spray liquid in the container from a nozzle orifice, and that includes: a main body having a flow path for circulating the liquid, a cylinder portion formed in the flow path, and a nozzle orifice located at the tip of the flow path; a trigger portion supported by support shaft portions provided on both side surfaces of the main body; a piston portion connected to the trigger portion; and a spring portion that urges the trigger portion forward to return it to its original position, and the piston portion slides along the inner wall of the cylinder portion based on the rotation of the trigger portion in the forward and backward directions around the support shaft portion, and the support hole portion formed in the trigger portion for attachment to the support shaft portion is circular in side view, and the cross section of the support shaft portion perpendicular to the axial direction is a partial circle with at least a part of the arcuate portion of the circle cut out, and a space is formed between the periphery of the support hole portion and the support shaft portion.

[0010] In the trigger sprayer of the present invention, it is preferable that the cross section of the support shaft perpendicular to the axial direction has a partially cut-out circular shape with a first arched portion at the bottom of the circle and a second arched portion at the rear of the circle cut out.

[0011] The trigger sprayer of the present invention is manufactured by injection molding, and the outer periphery of a cross section perpendicular to the axial direction of the support shaft has a linear first chord portion formed by cutting out the first arcuate portion, and a linear second chord portion formed by cutting out the second arcuate portion, and it is preferable that the first chord portion is horizontal and the second chord portion is vertical.

[0012] In the trigger sprayer of the present invention, it is preferable that the outer periphery of the cross section perpendicular to the axial direction of the support shaft portion comprises a first chord portion, a second chord portion, a large arc portion connecting the front end of the first chord portion and the upper end of the second chord portion, and a small arc portion connecting the rear end of the first chord portion and the lower end of the second chord portion.

[0013] In the trigger sprayer of the present invention, it is preferable that the angle formed by the center point of the support shaft portion and the straight line connecting both ends of the large arc portion is 160 to 220 degrees, and the angle formed by the center point of the support shaft portion and the straight line connecting both ends of the small arc portion is 2 to 5 degrees.

[0014] The trigger sprayer of the present invention further comprises a first valve portion housed in the cylinder portion and capable of opening and closing the gap between the cylinder portion and the flow path, a second valve portion housed in a valve cylinder portion formed in the flow path and capable of opening and closing the gap between the valve cylinder portion and the flow path, and a nozzle cap portion attached to the nozzle mouth portion, and it is preferable that the valve cylinder portion is formed closer to the nozzle mouth portion in the flow path than the cylinder portion. [Effects of the Invention]

[0015] In the trigger sprayer of the present invention, when the trigger portion is rotated rearward, the liquid stored in the cylinder portion is pushed out by the piston portion and sprayed in conjunction with this. Furthermore, by rotating the trigger portion, which is returned to its original position by the spring portion, in the forward direction, the liquid in the container is sucked up and stored in the cylinder portion in conjunction with this. Therefore, the liquid in the container can be sprayed repeatedly based on the rotation of the trigger.

[0016] In this case, the support hole portion formed in the trigger portion is circular in side view, the cross section perpendicular to the axial direction of the support shaft portion is semicircular, and a space is formed between the periphery of the support hole portion and the support shaft portion, so that the contact area between the periphery of the support hole portion and the support shaft portion can be reduced. This reduces the area where the periphery of the support hole and the support shaft come into contact and wear, as well as the area that deteriorates and affects rotation. Therefore, compared to when there is no space between the periphery of the support hole and the support shaft, it is possible to suppress changes in the rotational ability of the trigger due to fatigue or deterioration of the components, and it is possible to maintain the ease of rotation of the trigger for as long as possible.

[0017] In the trigger sprayer of the present invention, the cross section perpendicular to the axial direction of the support shaft is made into a notched circular shape with a first arcuate portion at the bottom of the circle and a second arcuate portion at the rear of the circle cut out, so that when the trigger is pulled rearward, the forward and upward loads applied to the support shaft can be released.

[0018] In the trigger sprayer of the present invention, the first chord portion on the outer periphery of the cross section perpendicular to the axial direction of the support shaft portion is horizontal, and the second chord portion is vertical, thereby simplifying the structure of the mold used for injection molding. Furthermore, since the mold can be pulled out linearly along the first chord portion or the second chord portion after molding, the total number of molds required for molding can be reduced.

[0019] In the trigger sprayer of the present invention, the outer periphery of the cross section perpendicular to the axial direction of the support shaft is made up of a large arc portion, a small arc portion, a first chord portion and a second chord portion, so that the contact portion between the periphery of the support hole and the support shaft is the large arc portion and the small arc portion, thereby preventing axial wobble of the trigger portion.

[0020] In this case, by setting the angle between the center point of the support shaft and the line connecting both ends of the large arc section to 160 to 220 degrees, and the angle between the center point of the support shaft and the line connecting both ends of the small arc section to 2 to 5 degrees, it is possible to sufficiently maintain the ease of rotation of the trigger section while stabilizing the rotation of the trigger.

[0021] In the trigger sprayer of the present invention, the provision of a first valve portion makes it possible to prevent backflow of liquid into the container, and the provision of a second valve portion makes it possible to spray pressurized liquid from the nozzle cap portion. In the trigger sprayer of the present invention, the nozzle cap attached to the nozzle opening protects the nozzle opening. In addition, by providing the nozzle cap with a flow path opening / closing function and a spray direction adjustment function, these functions can be imparted to the trigger sprayer. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a side cross-sectional view showing a trigger sprayer according to this embodiment. [Figure 2] FIG. 2 is a side view for explaining the assembled state of the main body and trigger of the trigger sprayer according to this embodiment. [Figure 3] FIG. 3 is a side view showing the support shaft of the trigger sprayer according to this embodiment. [Figure 4] FIG. 4 is a schematic view for explaining a mold opening step in injection molding for manufacturing the main body of the trigger sprayer according to this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings as necessary. In the drawings, the same elements are designated by the same reference numerals, and duplicated explanations will be omitted. Furthermore, unless otherwise specified, the positional relationships such as up, down, left, and right will be based on the positional relationships shown in the drawings. Furthermore, the dimensional ratios of the drawings are not limited to those shown in the drawings.

[0024] The trigger sprayer according to the present invention is attached to a container and is used to spray a predetermined amount of liquid in the container from the nozzle opening in a predetermined direction by operating the trigger portion. The shape and material of the container are not particularly limited, and any known shape or material can be used as appropriate. The liquid is not particularly limited as long as it can be sprayed, and any known liquid can be used as appropriate. In this specification, the downstream side in the direction in which the liquid is sprayed is referred to as the "front" side, and the upstream side is referred to as the "rear" side.

[0025] FIG. 1 is a side cross-sectional view showing a trigger sprayer according to this embodiment. As shown in FIG. 1, the trigger sprayer 100 according to this embodiment includes a main body 1 having a flow path 11 for circulating liquid, a cylinder 13 and a valve cylinder 14 formed in the flow path 11, and a nozzle opening 12 located at the tip of the flow path 11; a trigger 2 supported by support shafts (not shown) provided on both sides of the main body 1; a piston 3 connected to the trigger 2; a spring 4 that urges the trigger 2 forward to return the trigger 2 to its original position; a first valve 5a housed in the cylinder 13 and capable of opening and closing the gap between the cylinder 13 and the flow path 11; a second valve 5b housed in the valve cylinder 14 and capable of opening and closing the gap between the valve cylinder 14 and the flow path 11; a nozzle cap 6 attached to the nozzle opening 12; and a cover 7 that covers the main body 1. Therefore, the trigger sprayer 100 has a structure in which a main body portion 1, a trigger portion 2, a piston portion 3, a spring portion 4, a first valve portion 5a, a second valve portion 5b, a nozzle cap portion 6, and a cover portion 7 are assembled together.

[0026] In the flow path 11, the valve cylinder portion 14 is formed closer to the nozzle opening portion 12 than the cylinder portion 13. The flow path 11 has a first flow path 11a, a second flow path 11b, and a third flow path 11c. That is, the flow path 11 has a first flow path 11a from the container to the cylinder portion 13, a second flow path 11b from the cylinder portion 13 to the valve cylinder portion 14, and a third flow path 11c from the valve cylinder portion 14 to the nozzle mouth portion 12.

[0027] In the trigger sprayer 100, the main body 1, trigger 2, piston 3, spring 4, first valve 5a, second valve 5b, nozzle cap 6, and cover 7 are preferably all made of resin. In this case, metal is used as little as possible, so the weight of the trigger sprayer 100 itself can be reduced. Specifically, the total weight of the trigger sprayer 100 is preferably 20 g or less. Furthermore, among resins, these materials are preferably polyolefins, and more preferably polyethylene or polypropylene, which makes it possible to recycle these parts. The trigger sprayer 100 is manufactured by injection molding, which involves injecting resin into a mold. Injection molding will be described later.

[0028] In the trigger sprayer 100, when the trigger portion 2 rotates in the forward and backward directions around the support shaft portion (not shown), the piston portion 3 pivotally attached to the trigger portion 2 slides back and forth along the inner wall of the cylinder portion 13. The operation of rotating the trigger portion 2 in the rear direction is performed by the user, and the operation of rotating the trigger portion 2 in the forward direction and returning it to its original position is performed by the spring portion 4. The attachment of the trigger portion 2 to the support shaft portion will be described later.

[0029] In the trigger sprayer 100, when the trigger portion 2 is pulled and rotated rearward, the piston portion 3 slides in a direction to apply pressure to the inside of the cylinder portion 13. This causes the liquid in the cylinder portion 13 to flow out, and the resulting pressure causes the second valve portion 5b to open the gap between the valve cylinder portion 14 and the second flow path 11b and the third flow path 11c, allowing the liquid to flow through the third flow path 11c. The liquid is then sprayed outward from the nozzle opening 12 via the nozzle cap 6.

[0030] On the other hand, when the pressurized state is released by spraying the liquid, the spraying of the liquid stops, and the second valve portion 5b closes the communication between the valve cylinder portion 14 and the second flow path 11b and the third flow path 11c. Then, the spring portion 4 rotates the trigger portion 2 back in the forward direction, causing the piston portion 3 to slide in a direction to reduce the pressure inside the cylinder portion 13 . This causes the liquid in the container to be sucked up, and the resulting pressure causes the first valve section 5a to open between the cylinder section 13 and the first flow path 11a, causing the liquid to flow into the cylinder section 13 until the reduced pressure state in the cylinder section 13 is released.

[0031] According to the trigger sprayer 100 of this embodiment, the liquid in the container can be sprayed repeatedly based on the rotation of the trigger portion 2. Furthermore, since the first valve portion 5a is provided, it is possible to prevent the liquid from flowing back into the container. Furthermore, since the second valve portion 5b is provided, the pressurized liquid can be sprayed from the nozzle cap portion 6. Furthermore, since the nozzle cap portion 6 is provided, the nozzle opening portion 12 can be protected. Furthermore, by providing the nozzle cap portion 6 with a flow path opening / closing function, a spray direction adjusting function, and the like, it becomes possible to impart these functions to the trigger sprayer 100.

[0032] FIG. 2 is a side view for explaining the assembled state of the main body and trigger of the trigger sprayer according to this embodiment. 2, in the trigger sprayer 100 according to this embodiment, the upper end 2a of the trigger part 2 is cut out in a U-shape when viewed from the front, and the main body part 1 is arranged in the cutout part. That is, the upper end 2a of the trigger part 2 is positioned so as to sandwich the main body part 1 arranged in the cutout part from both sides.

[0033] A support hole 21 for attaching to a support shaft 20 (described later) is provided at each of the upper end portions 2a on both sides of the trigger portion 2. The left and right support holes 21 are symmetrical with respect to each other. The support hole 21 is a circular hole when viewed from the side.

[0034] On the other hand, in the trigger sprayer 100, support shafts 20 are provided so as to protrude outward on both side surfaces of the main body 1. The left and right support shafts 20 have a plane-symmetrical structure. The cross section of the support shaft portion 20 perpendicular to its axial direction has a partially cut-out circular shape with at least a partial arched portion of the circle cut out. Specifically, the cross section of the support shaft portion 20 perpendicular to its axial direction has a partially cut-out circular shape with a first arched portion 22a at the bottom of the circle and a second arched portion 22b at the rear of the circle cut out.

[0035] In the trigger sprayer 100, the cross-sectional size of the support hole 21 is the same as the cross-sectional size of the support shaft 20. Therefore, by attaching the support shaft 20 to the support hole 21, the trigger part 2 is attached to the main body part 1. At this time, because the support shaft portion 20 has a partially circular cross section, a space is formed between the support shaft portion 20 and the periphery of the support hole portion 21 at the positions of the first arched portion 22a and the second arched portion 22b. This has the advantage of making it easy to attach the support hole portion 21 to the support shaft portion 20.

[0036] In the trigger sprayer 100, because a space is formed, the contact area between the periphery of the support hole 21 and the support shaft 20 can be made smaller than when the support shaft is circular in cross section as in the conventional case (when there is no space between them). As a result, the area where the periphery of the support hole 21 and the support shaft 20 come into contact and wears, and the area that deteriorates and affects rotation are both made smaller, so that it is possible to suppress changes in the rotational ability of the trigger part 2 due to fatigue and deterioration of the components, and it is possible to maintain the ease of rotation of the trigger part 2 for as long as possible.

[0037] In the trigger sprayer 100, as described above, when the user pulls the trigger portion 2 backward during spraying, a backward force P1 is applied to the lower portion of the trigger portion 2, and a forward force P2 is applied to the middle portion of the trigger portion 2 by the spring portion 4. As a result, forces in opposite directions act on the lower and middle parts of the trigger part 2, and a rearward force P3 is applied to the support shaft part 20 from the periphery of the support hole part 21 of the trigger part 2, with the abutment point between the trigger part 3 and the spring part 4 as the fulcrum.

[0038] At this time, in the trigger sprayer 100, there is a space (second arcuate portion 22b) between the rear side of the support shaft portion 20 and the periphery of the support hole portion 21, so that the forward load applied to the support shaft portion 20 from the periphery of the support hole portion 21 can be released. In addition, since there is also a space (first arched portion 22a) between the lower side of the support shaft portion 20 and the periphery of the support hole portion 21, it is possible to release the load in the upward direction. Incidentally, when returning the trigger portion to its forward position, the user releases the trigger portion 2, so no force acts in the opposite direction, and only the force of the spring portion 4 pushing the trigger portion 2 forward is applied.

[0039] FIG. 3 is a side view showing the support shaft of the trigger sprayer according to this embodiment. As shown in FIG. 3, the outer periphery of the support shaft portion 20 in a cross section perpendicular to the axial direction of the support shaft portion 20 is made up of a large arc portion 20c, a small arc portion 20d, a first chord portion 20a, and a second chord portion 20b.

[0040] The first chord portion 20a is a straight line formed by cutting out the first bow-shaped portion 22a, and extends in the horizontal direction. The second chord portion 20b is a straight line formed by cutting out the second bow-shaped portion 22b, and extends in the vertical direction. These features make injection molding simple.

[0041] Here, injection molding of the main body 1 of the trigger sprayer 100 is performed using known processes, such as a clamping process for closing and holding each mold, an injection process for filling the molding of the mold with resin, a cooling process for cooling the resin, a mold opening process for opening the mold, and an ejection process for ejecting the main body 1.

[0042] FIG. 4 is a schematic view for explaining a mold opening step in injection molding for manufacturing the main body of the trigger sprayer according to this embodiment. As shown in Figure 4, in the injection molding of the main body 1, four separate molds are used: a first mold K1 for molding the upper part of the main body 1 including the support shaft 20, a second mold K2 for molding the front part of the main body 1 including the support shaft 20, a third mold K3 for molding the rear part of the main body 1, and a fourth mold K4 for molding the lower part of the main body 1.

[0043] In the mold opening step, the second chord portion 20b of the support shaft portion 20 is in the vertical direction, so that the first mold K1 can be removed vertically upward. Similarly, since the first chord portion 20a of the support shaft portion 20 is in the horizontal direction, the second mold K2 can be removed horizontally forward. In this way, since there are no undercuts, the mold can be pulled out linearly along the first chord portion 20a or the second chord portion 20b after molding, which makes it possible to minimize the total number of molds required. Incidentally, if the support shaft portion 20 is circular in side view and does not have the first chord portion 20a and the second chord portion 20b, as in the conventional case, an undercut portion will be created, which will require an additional mold, and the mold structure will also be complex.

[0044] Returning to FIG. 3, the large arc portion 20c is formed by a curve that connects the front end of the first chord portion 20a and the upper end of the second chord portion 20b. The small arc portion 20d is formed by a curve that connects the rear end of the first chord portion 20a and the lower end of the second chord portion 20b. The large arc portion 20c and the small arc portion 20d are located on the circumference of the same perfect circle, and are independent of each other. The center point C of the perfect circle corresponds to the center of the support shaft portion 20. Therefore, in the trigger sprayer 100, the contact portion between the support hole portion 21 and the support shaft portion 20 is located at a position corresponding to the large arc portion 20c and the small arc portion 20d, which not only reduces the area that wears out, but also prevents the trigger portion 2 from wobbling.

[0045] Here, in the trigger sprayer 100, the angle θ1 formed by the center point C of the support shaft portion 20 and the straight lines connecting both ends of the large arc portion 20c is preferably 160 to 220 degrees. If the angle θ1 is less than 160 degrees, the rotation of the trigger portion 2 may become unstable compared to when the angle θ1 is within the above range. If the angle θ1 exceeds 220 degrees, the rotation of the trigger portion 2 may be more likely to change due to fatigue or deterioration of the components compared to when the angle θ1 is within the above range, and it may become more difficult to maintain the ease of rotation of the trigger portion 2.

[0046] In the trigger sprayer 100, the angle θ2 formed by the center point C of the support shaft portion 20 and the straight line connecting both ends of the small arc portion 20d is preferably 2 to 5 degrees. If the angle θ2 is less than 2 degrees, there is a risk that the vicinity of the small arc portion 20d of the support shaft portion 20 will be more susceptible to damage when the trigger portion 2 rotates, compared to when the angle θ2 is within the above range. If the angle θ2 exceeds 5 degrees, there is a risk that the ease of rotation of the trigger portion 2 due to space will be hindered, compared to when the angle θ2 is within the above range.

[0047] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments.

[0048] In the trigger sprayer 100 of this embodiment, the main body portion 1, trigger portion 2, piston portion 3, spring portion 4, first valve portion 5a, second valve portion 5b, nozzle cap portion 6, and cover portion 7 are separate bodies that are assembled together, but any of these components may be molded integrally.

[0049] In the trigger sprayer 100 of this embodiment, the support shaft portion 20 has a cross section perpendicular to its axial direction that is in the shape of a notched circle with two notches cut out: a first arcuate portion 22a at the bottom of the circle and a second arcuate portion 22b at the rear of the circle, but the number of notched arcuate portions is not particularly limited. That is, it may be one location or three or more locations. Furthermore, the sizes of the first arcuate portion 22a and the second arcuate portion 22b may be the same or different.

[0050] In the trigger sprayer 100 according to this embodiment, the outer periphery of the cross section perpendicular to the axial direction of the support shaft portion 20 is made up of a large arc portion 20c, a small arc portion 20d, a first chord portion 20a, and a second chord portion 20b, but this is not essential.

[0051] In the trigger sprayer 100 according to this embodiment, the first chord portion 20a is in the horizontal direction and the second chord portion 20b is in the vertical direction, but this is not essential. For example, in injection molding, a draft angle may be provided to allow the mold to be removed more smoothly. That is, the first chord portion 20a and the second chord portion 20b may be slightly inclined in consideration of the draft angle. [Industrial Applicability]

[0052] The trigger sprayer according to the present invention can be used as a device that sucks up liquid contained in a container, stores a certain amount of liquid, and sprays it continuously. According to the trigger sprayer of the present invention, the ease of rotation of the trigger portion can be maintained for as long a period as possible. [Explanation of symbols]

[0053] 1. Main body 100···Trigger Sprayer 11. Flow path 12 Nozzle mouth 13 Cylinder section 14 Valve cylinder section 2. Trigger section 20...Support shaft part 20a...1st string section 20b...2nd string section 20c Large arc section 20d Small arc section 21...Support hole 22a...1st arcuate part 22b...Second arcuate part 2a...Top end 3. Piston section 4. Spring part 5a First valve section 5b Second valve section 6 Nozzle cap 7 Cover C...center point K1: First mold K2: Second mold K3: Third mold K4: Fourth mold

Claims

1. A trigger sprayer that is attached to a container and sprays liquid in the container from a nozzle opening, a main body portion having a flow path for distributing the liquid, a cylinder portion formed in the flow path, and a nozzle opening portion located at the tip of the flow path; a trigger portion supported by support shaft portions provided on both side surfaces of the main body portion; a piston portion connected to the trigger portion; a spring portion that biases the trigger portion forward to return the trigger portion to its original position; Equipped with The piston portion slides along the inner wall of the cylinder portion based on the rotation of the trigger portion in the front-rear direction around the support shaft portion, a support hole formed in the trigger portion for attachment to the support shaft portion has a circular shape in a side view, a cross section perpendicular to the axial direction of the support shaft portion has a partially cut-out circular shape in which at least a part of an arcuate portion of a circle is cut out, A trigger sprayer in which a space is formed between the periphery of the support hole and the support shaft.

2. 2. The trigger sprayer according to claim 1, wherein a cross section of the support shaft perpendicular to the axial direction is a partially circular shape in which a first arcuate portion at the bottom of the circle and a second arcuate portion at the rear of the circle are cut out.

3. It is manufactured by injection molding, an outer periphery of a cross section perpendicular to the axial direction of the support shaft portion has a linear first chord portion formed by cutting out the first arched portion and a linear second chord portion formed by cutting out the second arched portion, 3. The trigger sprayer of claim 2, wherein said first chord is horizontal and said second chord is vertical.

4. 4. The trigger sprayer according to claim 3, wherein the outer periphery of a cross section perpendicular to the axial direction of the support shaft portion comprises the first chord portion, the second chord portion, a large arc portion connecting the front end of the first chord portion and the upper end of the second chord portion, and a small arc portion connecting the rear end of the first chord portion and the lower end of the second chord portion.

5. the angle formed by a line connecting the center point of the support shaft portion and both ends of the large arc portion is 160 to 220 degrees, 5. The trigger sprayer according to claim 4, wherein an angle formed by a line connecting the center point of said support shaft portion and both ends of said small arc portion is 2 to 5 degrees.

6. a first valve portion housed in the cylinder portion and capable of opening and closing a connection between the cylinder portion and the flow path; a second valve portion housed in a valve cylinder portion formed in the flow path and capable of opening and closing a gap between the valve cylinder portion and the flow path; a nozzle cap attached to the nozzle mouth; Further provided with 6. The trigger sprayer according to claim 1, wherein the valve cylinder portion is formed on the nozzle opening side of the flow passage relative to the cylinder portion.

Images