JP2023028057A - Y-shaped interdental cleaning tool - Google Patents

Abstract

To provide a Y-shaped interdental cleaning tool which enables a user to easily adjust a tensile force of a cleaning thread while gripping.SOLUTION: A Y-shaped interdental cleaning tool includes a grip part long in a prescribed direction and a pair of arms that extend in the long direction at intervals from each other. It is provided with: a cleaning thread bridged across the pair of arms; a force reception part receiving a pressing force of a user; and a force transmission part which transmits the pressing force received by the force reception part to the pair of arm parts, and changes the tensile force of the cleaning thread in accordance with the pressing force. The grip part covers the force transmission part.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interdental cleaner, and more particularly to a Y-shaped interdental cleaner.

Dental flossers, which are currently in widespread use, are very convenient because the dental floss is fixed to a holder made of resin or the like with a certain tension and can be used by holding it with one hand.

Among them, a dental floss holder capable of adjusting the tension of dental floss is known (for example, Patent Document 1).

JP-A-11-197162

The dental floss holder described in Patent Document 1, as shown in FIGS. Applied gripping forces may unintentionally change the tension of the adjusted floss. Therefore, it was difficult to adjust the tension while gripping.

In view of the above, it is an object of the present invention to provide a Y-shaped interdental cleaner that can be easily adjusted by the user while holding the cleaning thread.

A Y-shaped interdental cleaning tool according to the present invention has Y-shaped teeth including a grip part elongated in a predetermined direction and a pair of arm parts extending from the tip of the grip part in the longitudinal direction with a gap therebetween. A space cleaning tool comprising: a cleaning thread passed over the pair of arm portions; a force receiving portion that receives a user's pressing force; and a pressing force received by the force receiving portion that is transmitted to the pair of arm portions. and a force transmission portion for changing the tension of the cleaning thread according to the pressing force, and the grip portion covers the force transmission portion.

According to this configuration, in the Y-shaped interdental cleaning tool, the pressing force received by the force receiving portion is transmitted by the force transmitting portion to the cleaning thread stretched over the pair of arm portions extending in the longitudinal direction with a space therebetween. tension can be varied. In addition, by covering the force transmission portion that changes the tension of the cleaning thread by the pressing force with the grip portion, the grip portion receives the user's grip force, thereby reducing the risk of the grip force being applied to the force transmission portion. As a result, in order to operate the Y-shaped interdental cleaning tool, the pressing force can be applied to the force receiving part independently from the user's gripping force, so that the user can adjust the tension of the cleaning thread while gripping it. becomes easier.

Further, an arm support portion is provided on the rear end side of the pair of arm portions to variably support the distance between the tip side of the pair of arm portions, and the force receiving portions are arranged to face each other with a space therebetween. The force transmission unit includes a first transmission unit and a second transmission unit that are spaced apart and opposed to each other, and the first transmission unit includes the The second transmission portion extends so as to connect the rear end of one of the pair of arm portions and the first reception portion, and the second transmission portion connects the rear end of the other arm portion of the pair of arm portions. When the first and second receiving parts are extended with a gap between them so as to connect with the second receiving part, and when the first and second receiving parts are pressed so as to narrow the gap between them, The pressing force is transmitted to the rear ends of the pair of arm portions by the first and second transmission portions, thereby opening the pair of arm portions with the arm support portion as a fulcrum, increasing the tension of the cleaning thread. preferably.

According to this configuration, the first transmission section is connected to the first reception section, and the second transmission section is connected to the second reception section, respectively, from the respective rear ends of the pair of arm sections. By providing these spaces, a space is ensured for the first transmission section and the second transmission section to move according to the pressing force. An arm supporting portion provided on the rear end side of the pair of arm portions serves as a fulcrum for converting the movement of the first transmission portion and the second transmission portion into the movement direction in which the pair of arm portions opens.

Further, the arm support portion has a substantially bar-like shape that connects the rear ends of the pair of arm portions, and bends in response to the pressing force transmitted by the first and second transmission portions, whereby the pair of is preferably open.

According to this configuration, the arm support portion having a substantially rod-like shape connects the rear ends of the pair of arm portions to each other, so that when the pressing force is transmitted from the first transmission portion and the second transmission portion, the arm support portion are bent and the pressing force is converted to the direction of motion in which the pair of arms are opened.

Further, the arm support portion is provided so that the rear ends of the pair of arm portions face each other with a gap therebetween, and the gap is formed according to the pressing force transmitted by the first and second transmission portions. It is preferable that the pair of arms be opened by being narrowed and the rear ends of the pair of arms coming into contact with each other and bending.

According to this configuration, when the pressing force is transmitted from the first transmission portion and the second transmission portion, the arm support portion provided with the gap between the rear ends of the pair of arm portions is moved to the arm support portion. abut against each other and bend as a fulcrum, and the pressing force is converted to an opening movement direction.

Further, a first side wall in a direction perpendicular to the facing direction of the first and second transmission portions of the portion of the grip portion covering the force transmission portion has a gap between the first and second transmission portions. A corresponding transmission-side slit is preferably formed.

According to this configuration, the gripping portion is provided with transmission-side slits that are unnecessary for the user to grip, corresponding to the distance between the first and second transmission portions. Therefore, if the first and second transmission parts are molded first and then the material is injected into the mold so as to cover the first and second transmission parts to integrally mold the grip part, the first and second transmission parts By inserting the insert into the gap between the two transmission parts, it is possible to remove the insert from the transmission-side slit while preventing the gap from being filled. Therefore, by providing the transmission-side slit in the gripping portion, it is possible to integrally mold the first and second transmitting portions and the gripping portion that covers the first and second transmitting portions.

Further, the first and second reception parts each have a substantially plate-like shape, and the grip part is orthogonal to the facing direction of the first and second reception parts of the first and second reception parts. A grip side slit corresponding to the distance between the first and second receiving portions is formed in a second side wall of a portion of the grip portion covering the side surfaces of the first and second receiving portions. is preferably formed.

According to this configuration, since the gripping portion covers the side surface in the direction orthogonal to the direction in which the first receiving portion and the second receiving portion face each other, the first receiving portion and the second receiving portion are unintentionally touched when gripped. It is possible to reduce the fear of being pressed.

Further, the grip side slit is formed in the first slit formed in the second side wall on one side perpendicular to the facing direction of the first and second receiving parts, and the facing direction of the first and second receiving parts. and a second slit formed in the second side wall on the other side perpendicular to the second slit, and the grip portion includes a first rib bridging the first slit and a second rib bridging the second slit It is preferable that the first rib and the second rib are installed at different positions with respect to the extending direction of the force transmission portion.

According to this configuration, if the grip portion is provided with the first and second slits, the grip portion is divided by the first and second slits, resulting in a decrease in strength. Therefore, by providing the first and second ribs, the strength of the grip portion can be improved. Further, when the first and second ribs are provided at the same position in the extending direction of the force transmission portion, both sides of the space between the first and second transmission portions are blocked by the first and second ribs. A space is created, and the insert piece cannot be placed in this portion. Therefore, by constructing the first rib and the second rib at different positions with respect to the extending direction of the force transmission portion, the insert piece inserted from the first rib side and the insert piece inserted from the second rib side position can be shifted. As a result, it is possible to form the interval between the first and second transmission parts as a continuous space by inserting pieces from both sides.

Further, a first extension portion of the first receiving portion extending to the side opposite to the first transmission portion, and a second extension portion of the second receiving portion extending to the side opposite to the second transmission portion Further, it is preferable that the ends of the first and second extension portions on the side opposite to the first and second receiving portions are connected to each other with a space therebetween.

According to this configuration, the first extension portion and the second extension portion are connected at the ends opposite to where the first reception portion and the second reception portion are located, so that the first reception portion and the second reception portion are respectively are supported on both sides of the first receiving portion and the second receiving portion.

Moreover, it is preferable that the force receiving portion has a substantially plate-like shape, and the grip portion covers a side surface of the force receiving portion in a direction perpendicular to the direction of the pressing force.

According to this configuration, since the gripping portion covers the side surface of the force receiving portion in the direction orthogonal to the direction of the received pressing force, the possibility of unintentionally pressing the force receiving portion when gripping is reduced. be able to.

Further, the force receiving portion and the force transmitting portion are made of a first resin, the gripping portion is made of a second resin, and the first resin and the second resin are mutually It preferably has a property of being difficult to adhere.

According to this configuration, the force receiving portion and the force transmitting portion made of the first resin and the grip portion made of the second resin are integrally molded in the mold. Since the first resin and the second resin have the property of being difficult to adhere to each other, the force receiving portion and the force transmitting portion and the gripping portion are separated from each other when molding. The force receiving portion and the force transmitting portion can be covered while maintaining the mobility of the force transmitting portion.

A method for manufacturing a Y-shaped interdental cleaning tool according to the present invention is the above-described Y-shaped interdental cleaning tool manufacturing method, comprising: (1) the pair of arm portions, the force receiving portion, and the force transmitting portion; (2) forming the pair of arm portions, the force receiving portion, and the force transmitting portion by providing the first resin in a first mold having corresponding cavities; (3) disposing the pair of arm portions, the force receiving portion, and the force transmitting portion in a second mold having a cavity corresponding to the interdental cleaning tool; Afterwards, the step of forming the grip portion by supplying the second resin into the second mold.

According to this manufacturing method, the pair of arm portions, the force receiving portion, and the force transmitting portion, which are molded from the first resin, are arranged in the cavity corresponding to the Y-shaped interdental cleaning tool, and are molded from the second resin. The grip is molded so that it is covered by

Further, a method for manufacturing a Y-shaped interdental cleaning tool according to the present invention is the above-described Y-shaped interdental cleaning tool manufacturing method, comprising: (1) the pair of arm portions, the force receiving portion, and the force transmitting portion; (2) forming the pair of arm portions, the force receiving portion and the force transmitting portion by providing a first resin in a first mold having cavities corresponding to the Y (2a) placing the pair of arms, the force receiving part, and the force transmitting part in a second mold having a cavity corresponding to the interdental cleaning tool; (3a) inserting a piece corresponding to the transmission side slit into the space between the first and second transmission parts; and forming the grip portion by supplying a second resin, wherein the first resin and the second resin preferably have a property of being difficult to adhere to each other.

According to this manufacturing method, when the grip portion made of the second resin is molded so as to cover the pair of arm portions, the force receiving portion, and the force transmitting portion molded of the first resin, the pair of arm portions, The gripping portion is formed in a state in which the insert piece is inserted into the space required for the force receiving portion and the force transmitting portion to be variable. Thus, by extracting the inserted piece after molding, a gap is formed between the first transmission portion and the second transmission portion, and the transmission side slit is formed.

With such a Y-shaped interdental cleaner, the user can easily adjust the tension of the cleaning thread by pressing while holding the Y-shaped interdental cleaner.

1 is a perspective view showing a Y-shaped interdental cleaner according to an embodiment of the present invention; FIG. 1 is an exploded view showing a Y-shaped interdental cleaner according to an embodiment of the present invention; FIG. 1 is a cross-sectional view showing a Y-shaped interdental cleaner according to an embodiment of the present invention; FIG. FIG. 10 is a schematic diagram showing that the force receiving portion 12 of the Y-shaped interdental cleaning tool A is pressed to increase the tension of the cleaning thread 3; FIG. 11 is a perspective view showing a Y-shaped interdental cleaner according to another embodiment of the present invention; 4 is a flow chart showing a method for manufacturing a Y-shaped interdental cleaner according to an embodiment of the present invention; FIG. 4 is a schematic diagram showing the first half of the process of manufacturing the Y-shaped interdental cleaning tool according to the embodiment of the present invention. FIG. 4 is a schematic diagram showing the second half of the method for manufacturing the Y-shaped interdental cleaning tool according to the embodiment of the present invention; 4 is a flow chart showing another manufacturing method of the Y-shaped interdental cleaning tool according to the embodiment of the present invention. FIG. 4 is a schematic diagram showing steps of another manufacturing method for the Y-shaped interdental cleaning tool according to the embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment according to the present invention will be described below with reference to the drawings. It should be noted that the same reference numerals in each figure indicate the same configuration, and the description thereof will be omitted. In each figure, XYZ orthogonal coordinate axes are shown as appropriate to clarify the directional relationship.

FIG. 1 is a perspective view showing a Y-shaped interdental cleaner according to an embodiment of the present invention. FIG. 2 is an exploded view showing a Y-shaped interdental cleaner according to an embodiment of the present invention; FIG. 3 is a cross-sectional view showing a Y-shaped interdental cleaner according to an embodiment of the present invention. The Y-shaped interdental cleaner A shown in FIGS. 1 to 3 includes a primary member 1 including a pair of arms 10, a force receiving portion 12, a force transmitting portion 14, a first extension portion 161, and a second extension portion 162; It is composed of a gripping portion 2 as a secondary member and a cleaning thread 3 .

The pair of arm portions 10 are spaced apart from each other, extend in the +X direction to approximately the middle position, and extend obliquely from the approximately middle position to the tip in the -Z direction. The pair of arm portions 10 has a pair of arm portions 10 on which the cleaning thread 3 is stretched on the tip side, and an arm support portion 101 which has a substantially bar-like shape connecting the rear ends to each other and supports the gap between the tip sides variably on the rear end side. is provided.

The force receiving portion 12 includes a first receiving portion 121 and a second receiving portion 122 which are arranged to face each other in the Y-axis direction with a space therebetween. are accepting

Also, the first receiving portion 121 and the second receiving portion 122 have a substantially plate-like shape. Note that this is not the case as long as it has a shape that can easily receive the pressing force from the user.

As with the force receiving portion 12, the force transmitting portion 14 includes a first transmitting portion 141 and a second transmitting portion 142 that are spaced apart from each other and opposed to each other in the Y-axis direction.

The first transmission portion 141 extends in the X-axis direction so as to connect the rear end of one of the pair of arm portions 10 and the first reception portion 121 . The second transmitting portion 142 extends in the X-axis direction so as to connect the rear end of the other of the pair of arm portions 10 and the second receiving portion 122 . At this time, the first transmission portion 141 and the second transmission portion 142 are extended with a space therebetween.

The first extension portion 161 extends from the first reception portion 121 in the opposite side, not the first transmission portion 141 side, that is, in the -X direction. The second extension portion 162 extends from the second reception portion 122 in the opposite side, not the second transmission portion 142 side, that is, in the -X direction. The −X direction end of the first extension portion 161 and the −X direction end of the second extension portion 162 are connected by a connecting portion 163 with a space therebetween.

By connecting the ends of the first extension portion 161 and the second extension portion 162, the first transmission portion 141 and the second transmission portion 142 side and the first extension portion 161 and the second extension portion 162 side The first reception part 121 and the second reception part 122 are supported from both sides, and the repulsive force against the pressing force is increased.

The force receiving portion 12 , the force transmitting portion 14 , the first extension portion 161 and the second extension portion 162 form a space in the primary member 1 from the arm support portion 101 to the connecting portion 163 in the Y-axis direction.

FIG. 4 is a schematic diagram showing that the force receiving portion of the Y-shaped interdental cleaner is pressed to increase the tension of the cleaning thread. As shown in FIG. 4A, when the first receiving portion 121 and the second receiving portion 122 of the primary member 1 receive the pressing force from the user, the first transmitting portion 141 and the second transmitting portion 142 are connected to each other. At the same time, the space between them is narrowed according to the pressing force.

As shown in FIG. 4B , when the distance is narrowed, the arm support portion 101 on the pair of arm portions 10 becomes a fulcrum, and the arms are moved according to the pressing force transmitted from the first transmission portion 141 and the second transmission portion 142 . The support portion 101 bends and moves in the direction in which the tension of the cleaning thread 3 increases, that is, in the direction in which the distal end portions of the pair of arm portions 10 open each other.

Note that the arm support portion 101 has a substantially bar-like shape that connects the rear ends of the pair of arm portions 10 as a fulcrum for increasing the tension of the cleaning thread 3 that is stretched over, but is not limited to this. .

FIG. 5 is a perspective view showing a Y-shaped interdental cleaner according to another embodiment of the present invention; For example, as shown in FIG. 5, the rear ends of the pair of arm portions 10 are opposed to each other with a gap S therebetween without being connected to each other. are in contact with each other to serve as a fulcrum.

The grip portion 2 is long in the X-axis direction, and includes a first transmission portion 141 and a second transmission portion 142, a first reception portion 121 and a second reception portion 122, a first extension portion 161 and a second extension portion 162. cover the The first reception part 121 and the second reception part 122 are covered with the grip part 2 so as to expose the surfaces to be pressed.

In addition, the grip portion 2 has both surfaces covering the force transmission portion 14 in the Z-axis direction perpendicular to the Y-axis direction in which the first transmission portion 141 and the second transmission portion 142 face each other and in the longitudinal direction (X-axis direction). The first side wall 201 is the first side wall 201, and the second side portion covers the force receiving portion 12 in the Z-axis direction perpendicular to the Y-axis direction in which the first receiving portion 121 and the second receiving portion 122 face each other and in the X-axis direction. A side wall 202 is provided. The first side wall 201 and the second side wall 202 are continuously provided.

A transmission side slit 24 is formed in the first side wall 201 so as to correspond to the gap between the first transmission portion 141 and the second transmission portion 142 . The second side wall 202 is formed with a gripping side slit 22 corresponding to the space between the first receiving portion 121 and the second receiving portion 122 . The transmission side slit 24 and the gripping side slit 22 are formed in a row in the same manner as the first side wall 201 and the second side wall 202 .

The gripping-side slit 22 covers one surface of both surfaces covering the force receiving portion 12 in the X-axis direction and in the Z-axis direction perpendicular to the Y-axis direction in which the first receiving portion 121 and the second receiving portion 122 face each other. A first slit 221 is provided, and a second slit 222 is provided on the other surface.

A first rib 223 is provided in the first slit 221 at a position different in the X-axis direction, and a first rib 223 is provided in the second slit 222 at a position different in the X-axis direction, and from the first rib 223 when viewed from the Z-axis direction. A second rib 224 is provided at a position that does not overlap. By installing the first rib 223 and the second rib 224 so as not to overlap each other, it becomes possible to insert and remove insert pieces for holding the gap formed in the primary member 1 during molding. molding can be performed.

In this embodiment, the primary member 1 is provided with a first extension portion 161 and a second extension portion 162 extending from the first reception portion 121 and the second reception portion 122 and connected to each other. However, this is not the case as long as a repulsive force against pressure and a stable grip can be provided, for example, by covering the extended portions with the grip portion without connecting the extension portions.

Next, the manufacturing method of the present invention will be described. FIG. 6 is a flow chart showing a method for manufacturing a Y-shaped interdental cleaner according to an embodiment of the present invention. 7 and 8 are schematic diagrams showing steps of a method for manufacturing a Y-shaped interdental cleaning tool according to an embodiment of the present invention.

In step S11, as shown in FIG. 7A, corresponding to the pair of arm portions 10, the force receiving portion 12, the force transmitting portion 14, the first extension portion 161, and the second extension portion 162, the arms are connected from the arm support portion 101. The primary member 1 is molded by injecting and filling a first resin into a first mold 90 having a cavity shaped to provide a space to the portion 163 .

At this time, the cleaning thread 3 may be stretched between the tip portions of the pair of arm portions 10 after the molding of the primary member 1 is completed, or may be wrapped around the tip portions of the pair of arm portions 10 before the primary member 1 is molded. Molding may be performed by arranging them so as to span at corresponding positions.

In step S12, as shown in FIG. 7B, the first mold 90 is opened and the primary member 1 is removed.

In step S13, as shown in FIG. 7(c), the insert piece 91 is inserted into the above-described interval so as to avoid the first rib 223 and the second rib 224. As shown in FIG.

In step S14, as shown in FIG. 8A, the primary member 1 is placed in a second mold 92 having a cavity corresponding to the shape of the primary member 1 into which the insert piece 91 is inserted and the grip portion 2. Afterwards, the grip portion 2 is formed by injection-filling the second resin.

In the present embodiment, the primary member 1 is placed in the second mold 92 after the insert piece 91 is first inserted into the above-described interval. After being placed in the mold 92, the primary member 1 may be arranged so that the insert piece 91 is inserted into the above-mentioned spacing, and the order of execution of the insert piece 91 and the second mold 92 is not limited. .

In step S15, as shown in FIG. 8(b), the second mold 92 is opened, and the Y-shaped interdental cleaning tool A is removed with the insertion piece 91 still inserted.

In step S16, the insert piece 91 is extracted from the Y-shaped interdental cleaning tool A, as shown in FIG. 8(c).

In addition, other than the above manufacturing method using the insert piece 91 in the second mold 92, another manufacturing method in which the projection 91a corresponding to the insert piece 91 is provided in the second mold 92 will be described. FIG. 9 is a flow chart showing another manufacturing method of the Y-shaped interdental cleaner according to the embodiment of the present invention. FIG. 10 is a schematic diagram showing steps of another manufacturing method for the Y-shaped interdental cleaning tool according to the embodiment of the present invention.

In step S1, as shown in FIG. 10A, corresponding to the pair of arm portions 10, the force receiving portion 12, the force transmitting portion 14, the first extension portion 161, and the second extension portion 162, they are connected from the arm support portion 101. The primary member 1 is molded by injecting and filling a first resin into a first mold 90 having a cavity shaped to provide a space to the portion 163 .

At this time, in the same manner as in the manufacturing method described above, the cleaning thread 3 may be stretched between the tips of the pair of arm portions 10 after the molding of the primary member 1 is completed, or before the primary member 1 is molded. The molding may be performed by arranging them so as to span at positions corresponding to the tip portions of the pair of arm portions 10 .

In step S2, as shown in FIG. 10(b), the shape of the primary member 1 that maintains the distance from the arm supporting portion 101 to the connecting portion 163 while avoiding the first rib 223 and the second rib 224, and the gripping The primary member 1 is placed in a second mold 92 having a cavity corresponding to part 2 .

Specifically, a convex portion 91 a corresponding to the insert piece 91 is formed on the second mold 92 , and the convex portion 91 a avoids the first rib 223 and the second rib 224 and is separated from the arm support portion 101 . By arranging the primary member 1 in the second mold 92 so as to fit in the space separated to the connecting part 163, the space is not filled by the next injection filling described later, and the molding can be performed integrally. can.

In step S3, as shown in FIG. 10(c), the second mold 92 is filled with the second resin to form the transmission-side slit 24 and the grip-side slit 22 for extracting the convex portion 91a. is molded.

The Y-shaped interdental cleaning tool according to the present invention has mobility while the primary member 1 is covered with the grip portion 2 . However, when the Y-shaped interdental cleaning tool is manufactured by these manufacturing methods described above, there is a risk that the primary member 1 and the gripping portion 2, which is a secondary member, will come into close contact with each other during molding.

In order to realize that the primary member 1 has mobility while being covered with the grip portion 2, the present invention uses the technique of insert molding or two-color molding to make the primary member 1 having the property of being difficult to adhere to each other. and the second resin form the primary member 1 and the grip portion 2, respectively.

The property of being difficult to adhere to each other refers to the property that the first resin and the second resin do not mix and are easily separated from each other. For example, the first resin is a crystallized resin made of polyacetal (POM), polyamide (PA), or polypropylene (PP), and the second resin is the same crystallized resin, or Acrylonitrile butadiene styrene (ABS), polycarbonate (PC), polymethyl methacrylate (PMMA), or other non-crystalline resins are difficult to adhere to each other. In this case, the adhesiveness is low and the particles tend to be separated from each other.

Among the crystallized resins, polypropylene easily adheres to each other. Therefore, when the first resin is polypropylene, the second resin is a crystallized resin other than polypropylene or a non-crystallized resin. prevent.

By forming the primary member 1 and the grip portion 2 from a hard resin that is difficult to adhere to each other, even if the Y-shaped interdental cleaning tool according to the present invention is integrally formed, the primary member 1 and the grip portion 2 can be , and the grip portion 2 are formed separately.

For this reason, since the grip portion 2 is separated when covering the primary member 1, the first transmission portion 141 and the second transmission portion 142 corresponding to the primary member, the first reception portion 121 and the second reception portion 122, and the first The extension part 161 and the second extension part 162 are provided movably within the grip part 2 without coming into close contact with the grip part 2 corresponding to the secondary member during molding.

As a result, the gap necessary for converting the pressing force in the movement direction in which the pair of arm portions 10 opens is maintained, and the primary member 1 and the grasping portion 2 are formed in a separated state, so that as shown in FIG. , the Y-shaped interdental cleaning tool covered with the grip portion 2 while the mobility of the primary member 1 is maintained.

A Y-shaped interdental cleaner 1 primary member 10 pair of arm portions 101 arm support portion 12 force receiving portion 121 first receiving portion 122 second receiving portion 14 force transmitting portion 141 first transmitting portion 142 second transmitting portion 161 first Extension part 162 Second extension part 163 Connecting part 2 Gripping part 201 First side wall 202 Second side wall 22 Gripping side slit 221 First slit 222 Second slit 223 First rib 224 Second rib 24 Transmission side slit 3 Cleaning thread 90 th First mold 91 Insert piece 91a Convex portion 92 Second mold S Gap

Claims (12)

A Y-shaped interdental cleaning tool comprising a grip portion elongated in a predetermined direction and a pair of arm portions extending from the distal end portion of the grip portion in the longitudinal direction with a gap therebetween,
a cleaning thread that is stretched over the pair of arms;
a force receiving unit that receives a user's pressing force;
a force transmission unit that transmits the pressing force received by the force receiving unit to the pair of arms and changes the tension of the cleaning thread according to the pressing force;
The grip portion is a Y-shaped interdental cleaner that covers the force transmission portion. An arm support portion is provided on the rear end side of the pair of arm portions to variably support the distance between the tip side of the pair of arm portions,
The force receiving portion includes a first receiving portion and a second receiving portion arranged facing each other with a space therebetween,
The force transmission section includes a first transmission section and a second transmission section that are arranged to face each other with a space therebetween,
The first transmission portion extends so as to connect a rear end of one of the pair of arm portions and the first reception portion,
The second transmission part extends with a gap from the first transmission part so as to connect the rear end of the other arm part of the pair of arm parts and the second reception part,
When the first and second reception parts are pressed so as to narrow the distance between them, the pressing force is transmitted to the rear ends of the pair of arms by the first and second transmission parts, 2. The Y-shaped interdental cleaning tool according to claim 1, wherein the pair of arm portions are opened with the arm support portion as a fulcrum to increase the tension of the cleaning thread. The arm support portion has a substantially rod-like shape that connects the rear ends of the pair of arm portions, and bends according to the pressing force transmitted by the first and second transmission portions to thereby support the pair of arms. The Y-shaped interdental cleaning tool according to claim 2, wherein the parts are open. The arm support portion is provided so that the rear ends of the pair of arm portions face each other with a gap therebetween, and the gap is narrowed according to the pressing forces transmitted by the first and second transmission portions. 3. The Y-shaped interdental cleaning tool according to claim 2, wherein the pair of arms are opened by bending the rear ends of the pair of arms in contact with each other. A first side wall in a direction perpendicular to the opposing direction of the first and second transmission portions of the portion of the grip portion covering the force transmission portion corresponds to the distance between the first and second transmission portions. The Y-shaped interdental cleaner according to any one of claims 2 to 4, wherein a transmission side slit is formed. Each of the first and second receiving parts has a substantially plate-like shape,
the gripping portion covers the side surfaces of the first and second receiving portions in a direction orthogonal to the facing direction of the first and second receiving portions;
A gripping side slit corresponding to the distance between the first and second receiving portions is formed in a second side wall of a portion of the gripping portion that covers the side surfaces of the first and second receiving portions. Item 6. A Y-shaped interdental cleaning tool according to item 5. The grip side slit is
a first slit formed in the second side wall on one side perpendicular to the facing direction of the first and second receiving portions;
a second slit formed in the second side wall on the other side orthogonal to the facing direction of the first and second reception parts,
The gripping part is
a first rib that spans the first slit;
and a second rib that spans the second slit,
The Y-shaped interdental cleaning tool according to claim 6, wherein the first rib and the second rib are installed at different positions with respect to the extending direction of the force transmission portion. a first extension portion of the first reception portion extending to the side opposite to the first transmission portion;
a second extension portion of the second reception portion extending in a direction opposite to the second transmission portion;
The Y according to any one of claims 2 to 7, wherein the ends of the first and second extension portions opposite to the first and second reception portions are connected to each other with a space therebetween. interdental cleaner. The force receiving portion has a substantially plate-like shape,
The Y-shaped interdental cleaning tool according to any one of claims 1 to 8, wherein the grip portion covers a side surface of the force receiving portion in a direction perpendicular to the direction of the pressing force. The force receiving portion and the force transmitting portion are made of a first resin,
The grip portion is made of a second resin,
The Y-shaped interdental cleaning tool according to any one of claims 1 to 9, wherein the first resin and the second resin have a property of being difficult to adhere to each other. A method for manufacturing the Y-shaped interdental cleaning tool according to claim 10,
(1) providing the first resin in a first mold having cavities corresponding to the pair of arm portions, the force receiving portion, and the force transmitting portion; molding the force receiving portion and the force transmitting portion;
(2) arranging the pair of arm portions, the force receiving portion, and the force transmitting portion in a second mold having a cavity corresponding to the Y-shaped interdental cleaning tool;
(3) A method of manufacturing a Y-shaped interdental cleaning tool, including a step of forming the grip portion by supplying the second resin into the second mold after the step (2). A method for manufacturing a Y-shaped interdental cleaner according to any one of claims 5 to 7,
(1) By providing a first resin in a first mold having cavities corresponding to the pair of arm portions, the force receiving portion, and the force transmitting portion, the force molding the receiving portion and the force transmitting portion;
(2) arranging the pair of arm portions, the force receiving portion, and the force transmitting portion in a second mold having a cavity corresponding to the Y-shaped interdental cleaning tool;
(2a) inserting an insert corresponding to the transmission-side slit into the space between the first and second transmission parts in the second mold;
(3a) After the step (2a), a step of forming the grip portion by supplying a second resin into the second mold,
The method for manufacturing a Y-shaped interdental cleaning tool, wherein the first resin and the second resin have a property of being difficult to adhere to each other.

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