Applicator

Abstract

To prevent sudden liquid discharge in an applicator equipped with a valve that is opened by pressing the main body.SOLUTION: There is provided an applicator comprising: a barrel which accommodates therein coating liquid, and which can deform when a side surface thereof is pressed; an application part which is formed as a brush head and which has a liquid through hole at a rear end thereof; a tip shaft through which the application part is inserted and which is attached to a tip end of the barrel; an application part holding member which is accommodated inside the tip shaft, which holds the rear end of the application part in a tip end direction, and which, at the shaft center, has an insertion hole that is open frontward; a valve mechanism which is accommodated at a tip end portion of the barrel, which is attached between the coating liquid accommodation part and the application part holding member, and which opens along with pressing of the side surface of the barrel; an intermediate core which is a porous body, which is inserted into the insertion hole and the liquid through hole, and which establishes communication between the application part holding member and the application part; a tip shaft insert which is inserted into the tip end of the tip shaft in a state in which the application part is inserted, and a tip end edge of which is exposed from the tip end of the tip shaft; and a cap which covers the tip end of the tip shaft and which has a level difference on the inside, wherein in a state in which the cap is attached to the tip shaft, the level difference presses the tip end of the tip shaft insert rearward.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present disclosure relates to an applicator that has a valve mechanism inside a barrel and supplies cosmetic liquid when the barrel is pressed. [Background technology]

[0002] Conventionally, so-called valve-type applicators equipped with a valve mechanism inside the barrel have been known to open by pressing the barrel (Patent Document 1) or by knocking the rear end (Patent Document 2). However, these methods have problems such as not being able to use soft pen cores such as brush tips, and difficulty in controlling the amount of liquid dispensed. On the other hand, an applicator in which the internal valve mechanism is closed by attaching a cap has also been disclosed (Patent Document 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 6-3686 [Patent Document 2] Japanese Patent Application Publication No. 9-271710 [Patent Document 3] JP 2021-115710 A Summary of the Invention [Problem to be solved by the invention]

[0004] Here, in a felt tip pen that uses an elastic blow container as the barrel and has a mechanism for opening the valve by pressing the side of the container to allow the liquid to flow out, the liquid sometimes spurts out when the valve opens. Therefore, the objective of the present disclosure is to prevent sudden liquid outflow (so-called dripping) in an applicator having a valve that opens when the main body is pressed, and to easily control the amount of liquid discharged by varying the strength of pressure. [Means for solving the problem]

[0005] The aspects of the present disclosure are as follows.

[0006] <Aspect 1> The applicator of aspect 1 includes a barrel having an internal space that serves as an application liquid storage section for storing an application liquid and that is deformable when a side surface of the barrel is pressed; an application part formed as a brush tip made of bundled fibers, the rear end of which is melted and a liquid passage hole for passing the application liquid toward the front end of the brush is formed; a front barrel into which the application portion is inserted and which is attached to a front end of the barrel; a cylindrical applicator holding member that is accommodated inside the front barrel and holds a rear end of the applicator part in a tip direction; an insertion hole formed at an axis of the application part holding member and opening forward; a valve mechanism that is accommodated in a tip portion of the barrel and is interposed between the application liquid accommodation portion and the application portion holding member, and that opens when a side surface of the barrel is pressed; a front barrel insert that is inserted into the front end of the front barrel with the applicator portion communicated with the applicator portion holding member inserted therethrough, and a front end edge of the front barrel insert is exposed from the front end of the front barrel; A cap that covers the tip of the front barrel and has a step therein; With the cap attached to the front barrel, the step presses the tip of the front barrel insert rearward.

[0007] In the applicator of embodiment 1, cosmetic liquid is supplied to the writing tip from the barrel via the valve mechanism, but when the cap is attached, the tip of the front barrel insert abuts against a step in the cap and is pressed and moves rearward. Then, the applicator holding member located at the rear end of the front barrel insert moves rearward together with the movement of the front barrel insert, restricting the valve mechanism from opening when the valve mechanism moves forward. In other words, the valve mechanism is designed not to open when the cap is attached. Therefore, even if the barrel is pressed with the cap attached, leakage of cosmetic liquid is restricted.

[0008] <Aspect 2> The applicator of aspect 2 has the same configuration as aspect 1, and further comprises: A valve retaining member; a front spring retaining member attached to a tip of the valve retaining member; A first valve housed in the valve holding member; A second valve built into the first valve; a rear spring retaining member attached to a tip of the first valve and abutting a tip portion of the second valve; a first spring interposed between the front spring retaining member and the rear spring retaining member and biasing the first valve rearward; a second spring interposed between the first valve and the second valve and biasing the second valve forward, when the internal pressure of the coating liquid storage portion becomes positive with respect to the external air pressure, the first spring is pressed forward by the first valve, thereby allowing the coating liquid to flow through a gap generated between the valve holding member and the first valve, When the internal pressure of the coating liquid storage section becomes negative relative to the external air pressure, the second spring is pressed rearward by the second valve, allowing air to flow into the coating liquid storage section through the gap created between the second valve and the rear spring retaining member. In the applicator of aspect 2, it is possible to separate the outflow path for the application liquid and the inflow path for the air inside the valve mechanism, making it possible to smoothly exchange air when the application liquid is used.

[0009] <Aspect 3> The applicator of aspect 3 has, in addition to the configuration of aspect 1 or aspect 2, a sawtooth groove having a triangular apex at an angle of less than 45° with respect to the axial direction formed on the inner surface of the cap in the vicinity of the step; The sawtooth grooves make the inner surface of the cap in the vicinity of the step a discontinuous surface.

[0010] In the applicator of aspect 3, the possibility that a part of the applicator part configured as a brush tip will get caught inside the cap when the cap is attached is reduced.

[0011] <Other> In addition, it is preferable that the applicator of the present disclosure is provided with a porous intermediate core that is inserted into the insertion hole of the applicator portion holding member and the liquid through hole of the applicator portion to communicate between the applicator portion holding member and the applicator portion, and that can appropriately control the amount of liquid. Effect of the Invention

[0012] According to an aspect of the present disclosure, an applicator having a valve that opens when the body is pressed can prevent sudden liquid leakage (so-called dripping) and makes it easy to control the amount of liquid dispensed by varying the strength of pressure. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a front view of an applicator according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a rear perspective view showing the applicator of FIG. 1 with the cap removed. [Diagram 3] FIG. 2 is a front view showing the applicator of FIG. 1 with the cap removed. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. [Diagram 5] 5 is an enlarged view of the periphery of the applicator part holding member in FIG. 4. [Figure 6A] FIG. 2 is a front perspective view of the application part holding member. [Figure 6B] FIG. 4 is a rear perspective view of the application part holding member. [Figure 6C] FIG. [Figure 6D] FIG. [Figure 6E] FIG. 4 is a bottom view of the application portion holding member. [Figure 6F] 6D is a cross-sectional view taken along line VI-VI of FIG. 6C. [Figure 7A] FIG. [Figure 7B] FIG. [Figure 7C] FIG. [Figure 7D] FIG. 7C is a cross-sectional view taken along line VII-VII of FIG. 7B. [Figure 7E] FIG. [Figure 8] FIG. 5 is a vertical cross-sectional view of the valve mechanism in FIG. [Figure 9A] FIG. 4 is a front perspective view of the valve retaining member. [Figure 9B] FIG. 4 is a rear perspective view of the valve retaining member. [Figure 9C] FIG. [Figure 9D] FIG. [Figure 9E] FIG. [Figure 9F] FIG. 4 is a bottom view of the valve holding member. [Figure 9G] IXa-IXa cross-sectional view of FIG. 12C. [Figure 9H] FIG. 12B is a cross-sectional view taken along line IXb-IXb of FIG. 12D. [Figure 10] XX cross-sectional view of FIG. [Figure 11] FIG. 11 is a cross-sectional view showing FIG. 10 with the cap omitted. [Figure 12] 12 is an enlarged view of the periphery of the applicator part holding member in FIG. 11. [Figure 13] FIG. 4 is a vertical cross-sectional view of the valve mechanism when the barrel is pressed. [Figure 14] 4 is a vertical cross-sectional view of the valve mechanism when the pressure on the barrel is released. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The following describes an embodiment of the present disclosure. Note that reference numerals commonly used in multiple drawings indicate common members or parts even if not specifically described in each drawing. In addition, the dimensions and ratios of each part shown in the drawings do not necessarily match the dimensions and ratios of the actual product. Furthermore, the dimensional relationships and ratios between the drawings may differ.

[0015] In addition, in this disclosure, the side of the applicator where the writing tip is located is referred to as the "tip," the direction toward the tip is referred to as the "forward," the opposite side is referred to as the "rear end," and the direction toward the rear end is referred to as the "rear."

[0016] FIG. 1 is a front view showing the appearance of an applicator 10 of the present disclosure. A front barrel 12 of approximately cylindrical shape and of approximately the same diameter is attached to the tip of a substantially cylindrical barrel 11, and the tip of the front barrel 12 is covered with a cap 13 of approximately cylindrical shape and of approximately the same diameter. FIG. 2 and FIG. 3 are a perspective view and a front view, respectively, showing a state in which the cap 13 is removed from the state of FIG. 1. The front barrel 12 is composed of a substantially cylindrical covering portion 12A that covers the tip portion of the barrel 11, an outer peripheral locking portion 12B that is located on the tip side of the covering portion 12A and has a male thread formed on the outer periphery for the cap 13 to screw into while being slightly reduced in diameter, and a tapered portion 12C that is reduced in diameter toward the front at its tip and has an open tip. From the opening at the tip of the tapered portion 12C, the application portion 14 formed as a brush tip 14A made of bundled fine fibers and the tip edge of the front barrel insert 15 that is inserted into the tip of the front barrel 12 with the application portion 14 inserted are exposed. That is, front barrel 12 is attached to the tip of barrel tube 11 with applicator portion 14 inserted through front barrel insert 15 .

[0017] Fig. 4 is a cross-sectional view of the applicator 10 of Fig. 3 taken along line IV-IV. Fig. 5 is an enlarged cross-sectional view of the applicator holding member 20 and its surroundings in Fig. 4. The barrel 11 is composed of a hollow, substantially cylindrical large-diameter portion 11A and a small-diameter portion 11B formed by reducing the diameter of the tip side of the barrel. The internal space of the barrel 11 is an application liquid storage portion 11D that stores application liquid 11C as a cosmetic. The barrel 11 is made of a synthetic resin that is relatively soft and highly flexible (e.g., polypropylene resin or low-density polyethylene resin, etc.), and can be deformed inwardly when the side surface is pressed. The application liquid storage portion 11D also contains a stirring bar 11E, which is a metal ball.

[0018] Covered portion 12A of front barrel 12 is screwed into small diameter portion 11B of barrel tube 11. A roughly cylindrical front barrel insert 15 is inserted into the internal space of outer circumferential locking portion 12B and tapered portion 12C of front barrel 12. The internal space of front barrel insert 15 has a small diameter on the tip side, and a step 15A is formed between this tip side and the rear end side.

[0019] The applicator part 14 is composed of a brush tip 14A formed by bundling fine synthetic resin fibers into a tapered shape, and a flange 14B with an expanded diameter at its rear end. The base of the brush tip 14A is melted, and a liquid passage hole 14C is formed in the center of its rear end. When the applicator part 14 is inserted into the front barrel insert 15, the flange 14B abuts against an internal step 15A.

[0020] Applicator portion holding member 20 is further inserted from the rear into front barrel insert 15 into which applicator portion 14 is inserted. Applicator portion 14 is held in a state in which flange 14B is sandwiched between step 15A of front barrel insert 15 and the front end of applicator portion holding member 20. That is, applicator portion holding member 20 is housed inside front barrel 12 via front barrel insert 15 and is a cylindrical member that holds the rear end of applicator portion 14 in the forward direction. An insertion hole 27 that opens forward is formed in the axial center of applicator portion holding member 20. A rear end portion of cylindrical relay core 30 is inserted into insertion hole 27, while a tip portion of relay core 30 is inserted into liquid passage hole 14C of applicator portion 14. Relay core 30 is formed of a porous body such as a fiber bundle, and is inserted into insertion hole 27 and liquid passage hole 14C to communicate applicator portion holding member 20 and applicator portion 14. A spring 20A is further inserted into the applicator-holding member 20. This spring 20A is interposed between the applicator-holding member 20 and a valve mechanism 40, which will be described later, and constantly biases the applicator 14 and the front barrel insert 15 forward through the applicator-holding member 20. Note that the shear rate of the cone-plate viscometer (VISCOMETER TV-20, manufactured by TOKIMEC Corporation) was 3.83 s -1 When using a coating liquid having a relatively high viscosity of 200 mPa·s or more as measured at 25° C. by the FT-IR spectrometer, the relay core 30 may be unnecessary.

[0021] 6A to 6F show the applicator holding member 20 in a front perspective view (FIG. 6A), a rear perspective view (FIG. 6B), a front view (FIG. 6C), a plan view (FIG. 6D), a bottom view (FIG. 6E), and a VI-VI cross-sectional view of FIG. 6C. The applicator holding member 20 has a structure in which a substantially cylindrical outer wall 21 located on the outside and a substantially cylindrical inner wall 22 located on the inside are connected by four connecting parts 23 near the tips of the two walls. The space between the connecting parts 23 in the plan view and bottom view is the liquid passage space 28 (FIGS. 6D and 6E). The space between the outer wall 21 and the inner wall 22 is the spring accommodating part 26. The internal space of the inner wall 22 is divided into front and rear by a shielding wall 24, and the space on the front side is the insertion hole 27 described above, and the space on the rear side is the rear recessed part 29. Within the insertion hole 27, four ribs 25 protrude radially inward.

[0022] 7A to 7D are a rear perspective view (FIG. 7A), a front view (FIG. 7B), a plan view (FIG. 7C), and a cross-sectional view (FIG. 7D) of cap 13 taken along line VII-VII of FIG. 7B. Cap 13 has a configuration in which a cylindrical outer tube 13A with an open rear end is inserted into an inner tube 13B with a smaller diameter and an open rear end, and a cap spring 13C is interposed between the front end face of outer tube 13A and a step near the rear end of inner tube 13B. A female screw is formed on the inner peripheral surface at the rear end of outer tube 13A, which serves as inner peripheral locking portion 13D that screws into outer peripheral locking portion 12B (see FIG. 3) of front barrel 12. A step 13F is formed slightly inside the leading edge of inner tube 13B. Furthermore, as shown in the enlarged view of FIG. 7E, a sawtooth groove 13E is formed on the inner surface near the step 13F, which is recessed in a sawtooth shape so that a plurality of apexes 13E1 each having a triangular shape at an angle of less than 45° (angle θ) with respect to the axial direction are arranged. The inner surface of the tip portion of the inner tube 13B is a discontinuous surface due to the bottoms 13E2 of the sawtooth groove 13E. Due to the sawtooth groove 13E, when the applicator part 14 enters the inside of the cap 13, the inner surface of the cap 13 comes into non-surface contact (point contact or tip contact) with the applicator part 14, so that the bristles of the brush tip 14A of the applicator part 14 are less likely to get caught.

[0023] As shown in Figs. 4 and 5 again, an O-ring 16 made of silicone rubber and formed in an annular shape is inserted into the step between the covering portion 12A and the outer circumferential locking portion 12B inside the front barrel 12. Meanwhile, a valve mechanism 40 with a valve mechanism support member 40A mounted thereon is attached to the tip of the barrel 11. The valve mechanism 40 is housed in the tip portion of the barrel 11 and is interposed between the application liquid storage portion 11D and the application portion holding member 20, and is a member that opens when the side of the barrel 11 is pressed. The valve mechanism support member 40A includes a cylindrical front abutment portion 40A2 that abuts against the tip edge of the barrel 11, and a cylindrical valve mechanism storage portion 40A1 with a smaller diameter that protrudes rearward from the front abutment portion 40A2. Two springs, a first spring 42 at the front and a second spring 44 at the rear, are inserted into the valve mechanism 40.

[0024] Fig. 8 is a vertical cross-sectional view of the valve mechanism 40 in Fig. 4. The valve mechanism 40 includes a valve holding member 50, a front spring holding member 41 attached to the tip of the valve holding member 50, a first valve 60 built in the valve holding member, a second valve 80 built in the first valve 60, a rear spring holding member 43 attached to the tip of the first valve 60 and in contact with a tip portion of the second valve 80, a first spring 42 interposed between the front spring holding member 41 and the rear spring holding member 43 and biasing the first valve 60 rearward, and a second spring 44 interposed between the first valve 60 and the second valve 80 and biasing the second valve 80 forward.

[0025] The front spring retaining member 41 has a tubular portion 41B that is inserted into the tip of the valve retaining member 50, and a flange 41A that protrudes outward at its front end. A first front retaining step 41C that is a circumferential protrusion is formed in the internal space of the tubular portion 41B. The first front retaining step 41C supports the first spring 42 on the tip side.

[0026] 9A to 9H are a front perspective view (FIG. 9A), a rear perspective view (FIG. 9B), a front view (FIG. 9C), a side view (FIG. 9D), a plan view (FIG. 9E), a bottom view (FIG. 9F), a IXa-IXa cross-sectional view (FIG. 9G) of FIG. 9C, and a IXb-IXb cross-sectional view (FIG. 9H) of FIG. 9D of the valve holding member 50. The valve holding member 50 has a flange-shaped leading edge 51, a smaller diameter accommodating tubular portion 52 at the rear of the valve holding member 50, a smaller diameter liquid-passing tubular portion 53 at the rear of the valve holding member 50, and a smaller diameter annular crown portion 54 at the rear of the valve holding member 50. A pair of first inlet holes 55 are formed on the side of the liquid-passing tubular portion 53. The valve holding member 50 is formed hollow, and its internal space becomes an accommodating hole 56, in which the first valve 60 is accommodated. The inner surface of the accommodating tubular portion 52 becomes a first liquid-passing surface 57. A step is formed on the leading edge of the first liquid passing surface 57, and this serves as liquid passing step 58. The flange 41A of the front spring holding member 41 (FIG. 8) described above abuts against the leading edge of the valve holding member 50 and is fixed thereto.

[0027] Returning to Fig. 8, the first valve 60 comprises a front tubular portion 61 located at the front, a fluid passage surface 62 tapering in diameter behind it, a rear tubular portion 63 smaller in diameter behind it, and a crowned portion 64 formed in an annular shape with an even smaller diameter behind it. A pair of second inlet holes 65 are formed in the side surface of the rear tubular portion 63. An insertion hole 66 through which the rear end portion of the second valve 80 is inserted is formed in the axial center of the crowned portion 64. In addition, a second rear retaining step 67 that supports the rear end of the second spring 44 is formed in the leading edge of the crowned portion 64.

[0028] The rear spring retaining member 43 includes a tubular portion 43B that is inserted into the tip of the first valve 60, and a flange 43A that protrudes outward at its front end and abuts against the tip edge of the first valve 60. A first rear retaining step 43C that supports the rear end side of the first spring 42 is formed on the inner peripheral edge of the flange 43A. A ventilation step 41D, which is a circumferential ridge, is formed in the internal space near the rear end of the tubular portion 41B.

[0029] The second valve 80 is a member housed inside the first valve 60. The second valve 80 includes a substantially cylindrical tubular portion 81, a ventilation surface 82 tapering in diameter at the tip end thereof, and a small-diameter rod-shaped portion 83 protruding rearward from the tubular portion 81. The step between the tubular portion 81 and the rod-shaped portion 83 forms a second front support step 84 that supports the tip end of the second spring 44.

[0030] The first spring 42 is a coil spring made up of an intermediate portion 42A and a leading end portion 42B and a rear end portion 42C, both of which are located at both ends and have smaller diameters. The first spring 42 is supported by a first front support step 41C at the step between the intermediate portion 42A and the leading end portion 42B, and is supported by a first rear support step 43C at the step between the intermediate portion 42A and the rear end portion 42C. On the other hand, the second spring 44 is a coil spring of uniform diameter. The leading end of the second spring 44 is supported by the second front support step 84, and the rear end is supported by the second rear support step 67.

[0031] The valve mechanism 40 shown in FIG. 8 is constructed as follows. First, the second valve 80 with the second spring 44 mounted on the rod-shaped portion 83 is inserted from the front of the first valve 60. Next, the cylindrical portion 43B of the rear spring holding member 43 is inserted from the front of the first valve 60, and the flange 43A is brought into contact with the front edge of the first valve 60. Then, the first valve 60 in this state is inserted from the front of the valve holding member 50. Furthermore, the first spring 42 is inserted from the front of the valve holding member 50. Finally, the cylindrical portion 41B of the front spring holding member 41 is inserted from the front of the valve holding member 50, and the flange 41A is brought into contact with the front edge of the valve holding member 50. In this way, the valve mechanism 40 shown in FIG. 8 is formed.

[0032] 8, the first valve 60 is biased rearward by the first spring 42, which causes the liquid passage step 58 of the valve holding member 50 to abut and closely contact with the liquid passage surface 62 of the first valve 60. In addition, the second valve 80 is biased forward by the second spring 44, which causes the air passage step 43D of the front spring holding member 41 to abut and closely contact with the air passage surface 82 of the second valve 80.

[0033] Then, valve mechanism support member 40A is inserted from the tip of barrel 11 in which application liquid 11C and stirring bar 11E are housed, and valve mechanism 40 in the state shown in Fig. 8 is further inserted. Then, front barrel 12, through which front barrel insert 15, through which application portion 14 and application portion holding member 20 are inserted, is screwed into barrel 11 in this state, to form applicator 10 in the state shown in Figs. 3 and 4. In this state, as shown in Fig. 5, application portion holding member 20 and front barrel insert 15 move forward due to the biasing force of spring 20A, so that the tip of front barrel insert 15 protrudes to its maximum from the tip edge of the front barrel.

[0034] FIG. 10 is a cross-sectional view taken along line XX in FIG. 1, showing the state in which the cap 13 is attached to the applicator 10 in the state shown in FIG. 3 and FIG. 4. FIG. 11 shows the state shown in FIG. 10 with the cap 13 omitted, and FIG. 12 shows an enlarged view of the vicinity of the applicator-holding member 20 in FIG. 11. As shown in FIG. 10, when the cap 13 is attached to the front barrel 12, a step 13F (see FIG. 7A, FIG. 7C, and FIG. 7D) formed on the inner surface of the cap 13 comes into contact with the tip of the front barrel insert 15 and presses it backward. Then, as shown in FIG. 12, the front barrel insert 15 presses the applicator-holding member 20 backward while compressing it against the biasing force of the spring 20A, so that the applicator-holding member 20 presses the valve mechanism 40 backward. In this state, with cap 13 attached, even if pressure is suddenly applied, for example by stepping on barrel tube 11, front barrel insert 15 cannot move forward due to step 13F of cap 13. In other words, the forward movement of valve mechanism 40 is restricted by applicator part holding member 20, preventing the valve from opening, and therefore applicator liquid 11C will not squirt out of applicator part 14.

[0035] When applicator 10 is not in use, cap 13 can be attached to tip barrel 12 to protect brush tip 14A of applicator part 14. Furthermore, sawtooth groove 13E having triangular apex 13E1 is formed on the inner surface of cap 13, so that brush tip 14A is less likely to come apart inside cap 13 when cap 13 is attached.

[0036] When the cap is removed from the state shown in Fig. 10, the restriction on the forward movement of the valve mechanism 40 by the applicator holding member 20 is released, as shown in Fig. 4 and Fig. 5. When the barrel 11 is pressed in this state to pressurize the inside of the application liquid storage portion 11D, the positive pressure relative to the external air pressure overcomes the urging force of the rear of the first spring 42, compressing it and moving the first valve 60 forward. This causes the liquid passage step 58 of the valve holding member 50 and the liquid passage surface 62 of the first valve 60 to separate from each other, allowing the application liquid 11C to flow between them. That is, as shown by the dashed line in Fig. 13, coating liquid 11C in coating liquid storage section 11D flows into valve holding member 50 from first inlet hole 55, passes between liquid passage step 58 and liquid passage surface 62, then passes through the clearance between the outer circumferential surface of front tubular section 61 of first valve 60 and first liquid passage surface 57 of valve holding member 50, and further passes between the leading edge of rear spring holding member 43 and the rear end edge of front spring holding member 41, to reach coating section holding member 20 shown in Fig. 5. From here, coating liquid 11C further reaches coating section 14 via relay core 30, and becomes possible to be applied to an object to be coated by brush tip 14A.

[0037] In other words, when the internal pressure of the coating liquid storage section 11D becomes positive relative to the external air pressure, the first spring 42 is pressed forward by the first valve 60, allowing the coating liquid 11C to flow through the gap generated between the valve holding member 50 and the first valve 60.

[0038] At this time, the coating liquid 11C is subjected to flow resistance due to narrow gaps, such as the gap between the liquid passage step 58 and the liquid passage surface 62, the clearance with the first liquid passage surface 57 of the valve holding member 50, and the gap between the leading edge of the rear spring holding member 43 and the rear end edge of the front spring holding member 41. In addition, the coating liquid 11C that has reached the coating part holding member 20 is forced to pass through the porous relay core 30, and is subjected to flow resistance here as well. These prevent the coating liquid 11C from dripping from the coating part 14.

[0039] When the pressure on the barrel 11 is released from the state shown in FIG. 13, the volume of the air in the coating liquid storage section 11D increases by the amount of the air that has been reduced by the consumption of the coating liquid 11C, and the pressure in the coating liquid storage section 11D becomes negative relative to the external air pressure. This generates a force that moves the second valve 80 backward. When this force overcomes the biasing force of the second spring 44, the second valve 80 moves backward while compressing the second spring 44, as shown in FIG. 14. This causes the ventilation step 43D of the rear spring holding member 43 and the ventilation surface 82 of the second valve 80 to separate from each other, allowing air to flow between them. That is, the air from the outside passes through the gap between the ventilation step 43D and the ventilation surface 82, and further passes through the second inlet hole 65 of the first valve 60 and the first inlet hole 55 of the valve holding member 50, as shown by the dashed line in FIG. 14, and reaches the coating liquid storage section 11D.

[0040] As described above, in the valve mechanism 40, the flow path of the coating liquid 11C (see FIG. 13) and the flow path of the air (see FIG. 14) are clearly separated, so that air replacement is carried out smoothly.

[0041] Furthermore, a first inlet hole 55 and a second inlet hole 65 are formed in the valve holding member 50 and the first valve 60 in the valve mechanism 40, respectively, and the space inside the valve mechanism 40 is opened to the outside. Therefore, when the applicator 10 is stored facing down, sediment originating from the application liquid 11C that accumulates inside the first valve 60 is easily stirred, making it possible to prevent poor sliding of the first valve 60 and the second valve 80 due to adhesion of sediment, etc. [Industrial Applicability]

[0042] INDUSTRIAL APPLICABILITY The present invention can be used for an applicator that has a valve mechanism inside a barrel and supplies cosmetic liquid by pressing the barrel. [Explanation of symbols]

[0043] 10 Applicator 11 Axle tube 11A Large diameter section 11B Small diameter section 11C Coating liquid 11D Coating liquid storage section 11E Stirrer 12 front shaft 12A covering portion 12B outer periphery locking portion 12C Tapered section 13 Cap 13A Outer tube 13B Inner tube 13C Cap spring 13D Inner circumference locking portion 13E Sawtooth groove 13E1 Top 13E2 Bottom 13F Step 14 Application part 14A Brush tip 14B Flange 14C Liquid hole 15 Tip insert 15A Step 16 O-ring 20 Application part holding member 20A Spring 21 outer wall 22 inner wall 23 connection part 24 shield wall 25 rib 26 spring housing 27 Insertion hole 28 Fluid passage space 29 Rear recess 30 Relay core 40 Valve mechanism 40A valve mechanism support member 40A1 valve mechanism accommodating portion 40A2 front abutment portion 41 Front spring retaining member 41A Flange 41B Cylindrical portion 41C First front retaining step 42 First spring 42A Middle part 42B Tip part 42C Rear end 43 Rear spring retaining member 43A Flange 43B Cylindrical portion 43C First rear retaining step 43D Ventilation step 44 Second Spring 50 Valve retaining member 51: leading edge; 52: receiving tube portion; 53: liquid passing tube portion 54 crown portion 55 first inlet hole 56 receiving hole 57 First liquid passage surface 58 Liquid passage step 60 first valve 61 front tube portion 62 liquid passage surface 63 Rear cylindrical part 64 Coronal part 65 Second inflow hole 66 Insertion hole 67 Second rear retaining step 80 second valve 81 cylindrical portion 82 ventilation surface 83 rod-shaped portion 84 second front retaining step

Claims

1. an inner space of the barrel serving as a coating liquid storage section for storing a coating liquid, and the barrel being deformable when a side surface of the barrel is pressed; an application part formed as a brush tip made of bundled fibers, the rear end of which is melted and a liquid passage hole for passing the application liquid toward the front end of the brush is formed; a front barrel into which the application portion is inserted and which is attached to a front end of the barrel; a cylindrical applicator holding member that is accommodated inside the front barrel and holds a rear end of the applicator part in a tip direction; an insertion hole formed at an axis of the application part holding member and opening forward; a valve mechanism that is accommodated in a tip portion of the barrel and is interposed between the application liquid accommodation portion and the application portion holding member, and that opens when a side surface of the barrel is pressed; a front barrel insert that is inserted into the front end of the front barrel with the applicator portion communicated with the applicator portion holding member inserted therethrough, and a front end edge of the front barrel insert is exposed from the front end of the front barrel; A cap that covers the tip of the front barrel and has a step therein; With the cap attached to the front barrel, the step presses the tip of the front barrel insert rearward.

2. The valve mechanism includes: A valve retaining member; a front spring retaining member attached to a tip of the valve retaining member; A first valve housed in the valve holding member; A second valve built into the first valve; a rear spring retaining member attached to a tip of the first valve and abutting a tip portion of the second valve; a first spring interposed between the front spring retaining member and the rear spring retaining member and biasing the first valve rearward; a second spring interposed between the first valve and the second valve and biasing the second valve forward, when the internal pressure of the coating liquid storage portion becomes positive with respect to the external air pressure, the first spring is pressed forward by the first valve, thereby allowing the coating liquid to flow through a gap generated between the valve holding member and the first valve, 2. The applicator according to claim 1, wherein when the internal pressure of the application liquid storage section becomes negative relative to the external air pressure, the second spring is pressed rearward by the second valve, thereby allowing air to flow into the application liquid storage section through a gap generated between the second valve and the rear spring retaining member.

3. a sawtooth groove having a plurality of triangular apexes at an angle of less than 45° with respect to the axial direction is formed on an inner surface of the cap in the vicinity of the step; The applicator according to claim 1 or 2, wherein the sawtooth grooves form a discontinuous surface on an inner surface of the cap in the vicinity of the step.

Images