JP2004298531A - Flexible connecting rod, connection member and three-dimensional assembly toy - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flexible three-dimensional assembly toy usable at the scene of rehabilitation in a school for a physically handicapped and mentally retarded children, a welfare institution for the elderly and a hospital, and an English conversation school for children, etc. <P>SOLUTION: In the three-dimensional assembly toy 1 composed of a flexible connecting rod 2 and a connection member 3, the flexible connecting rod 2 is provided with a deformable thin and long flexible connecting part 4 and roughly spherical connection parts 5 provided on both end parts of the flexible connecting part and provided with a hole 5a. The connection member 3 is constituted of a main body 7 and a pin 8, and the main body 7 is provided with a spherical part 7a in a spherical shape as a whole, connection projection parts 7b projected outward in the radial direction from the spherical part 7a and a through-hole 7c passing through the spherical part 7a. Then, the pin 8 can be forcibly inserted with a hand and fitted into the through-hole 7c and is provided with such a length that both end parts of the pin 8 project outward in the radial direction from the spherical part 7a in the fitting, and the tip parts 7e of the connection projection parts 7b and both end parts of the pin 8 can be forcibly inserted with the hand and fitted to the hole 5a of the connection part 5. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible connecting rod, a connecting member, and a three-dimensionally assembled play tool that can be used as an aid for play and gymnastics.
[0002]
[Prior art]
Conventionally, when performing gymnastics at a school for the disabled, towels and ropes have been used as gymnastics aids. For example, they did gymnastics by holding both ends of a towel and raising their hands and waving their upper body to the left and right. Students in special schools and the like may not be able to imitate the teacher's movements if they have nothing in their hands, and if the students have assistive devices such as towels, they will be able to imitate the teacher's movements. Since the towel does not stretch when pulled, both hands can be given a certain amount of tension, and by maintaining that tension, the student will be able to imitate the teacher stably. Therefore, when such a feeling of tension cannot be obtained, the student seems to be unable to move easily. For example, if multiple students enter a loop with a rope and each person plays the train with both hands holding the rope, if you pull it, you can keep the tension of the rope, but if you push it, the rope will The students flexed so quickly that they couldn't get enough tension, and the students gradually stuck to the previous person and became a dumpling, preventing them from playing on the train.
[0003]
On the other hand, conventionally, a flexible assembled toy has been known (for example, see Patent Literature 1 and Patent Literature 2). Patent Document 1 discloses a connecting member b including a bellows portion b2 and insertion portions b1 provided at both ends of the bellows portion b2, and a block a provided with a cubic or spherical resin hollow body and an insertion port a1 provided therein. Are disclosed.
Patent Literature 2 discloses an assembling toy including a stick 10 including a main body portion 14 at a central portion and a connecting portion 12 extending to both sides thereof, and a block 1 having a fitting hole 2 fitted with the connecting portion 12. I have. The main body portion 14 is composed of a cylindrical base portion 18 and a hollow bellows portion 20 extending between the base portions 18, and is expandable and contractible and flexible by applying an external force, and can maintain its shape even when external force is removed. It is something.
However, the flexible assembled toys of Patent Literature 1 and Patent Literature 2 are not used for gymnastics, and even if used for gymnastics, they expand and contract to maintain an appropriate tension. I can't.
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 61-200099 [Patent Document 2]
Published Japanese Utility Model Application No. 5-62299
[Problems to be solved by the invention]
With conventional towels and ropes, tension can be maintained when pulling, but when pressed, tension cannot be maintained, and in some cases it is difficult to combine various exercises with gymnastics in schools for the disabled.
Therefore, the present invention relates to a playground equipment that can be used in a nursing school, a welfare facility for the elderly, a rehabilitation site in a hospital, an English conversation classroom for infants, etc., which does not expand and contract when both hands are pulled or pushed. It is an object of the present invention to provide a playground equipment that can maintain a sense of tension.
[0006]
Another object of the present invention is to provide a plaything that can be easily bent or twisted and can maintain its deformed shape by itself.
It is still another object of the present invention to provide a playground equipment that allows a plurality of playground equipment to be combined in a three-dimensional manner, thereby enabling various types of gymnastics to be performed, and for the gymnastics to be developed.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention provides a flexible connecting rod, a connecting member, and a three-dimensionally assembled play apparatus comprising the flexible connecting rod and the connecting member as described below.
That is, in a flexible connecting rod (flexible pipe 2) for use in a game, an elongated flexible connecting part (4) that can be deformed and can maintain its deformed shape by itself, and a flexible connecting part. And a substantially spherical connection portion (joint ball 5) having holes (connection holes 5a).
The flexible connecting portion (4) is preferably formed by winding a metal strip while meshing it spirally.
The flexible connecting portion may be formed by covering a wire with a resin material.
The connection part (5) may be made of wood or resin material.
[0008]
In a coupling member (pod 3) having a main body (7) and a pin (8), the main body includes a spherical portion (7a) having a generally spherical shape, and a coupling protrusion protruding radially outward from the spherical portion. (7b) and a through-hole (7c) provided through the spherical portion. The pin (8) can be manually pressed into the through-hole (7c) and fitted. The both ends of the pin have such a length that they can protrude radially outward from the spherical portion.
The main body and the pin are preferably made of a resin material.
Four coupling projections are provided at equal intervals of approximately 90 degrees on the circumference of the spherical portion, and the through holes penetrate the spherical portion in a direction substantially perpendicular to the four coupling projections. Good.
An annular projection (7d) is formed on the coupling projection, and the tip (7e) of the coupling projection is preferably formed in a substantially hemispherical shape.
[0009]
In a three-dimensionally assembled play equipment (1) comprising a flexible connecting rod (flexible pipe 2) and a connecting member (pod 3), the flexible connecting rod (2) is deformable and self-maintains its deformed shape. An elongated flexible connecting portion (4), which can be connected to the connecting portion, and a substantially spherical connecting portion (joint ball 5) provided at both ends of the flexible connecting portion and having holes (connecting holes 5a). The member (3) is composed of a main body (7) and a pin (8). The main body (7) has a spherical portion (7a) having a spherical shape as a whole and a radially outward portion from the spherical portion (7a). And a through hole (7c) penetrating through the spherical portion (7a), and the pin (8) can be press-fit into the through hole (7c) by hand. , The length that both ends of the pin can protrude radially outward from the spherical part when fitted And the tip (7e) of the coupling projection (7b) and both ends of the pin (8) have dimensions that can be manually pressed and fitted into the holes (5a) of the connection part (5). I did it.
[0010]
In the three-dimensionally assembled play equipment (1) comprising a flexible connecting rod (flexible pipe 2) and a connecting member (3-pin pod 17), the flexible connecting rod (2) is deformable and has a deformed shape. An elongated flexible connection (4) that can be maintained and a substantially spherical connection (joint ball 5) provided at both ends of the flexible connection and having holes (connection holes 5a); The coupling member (17) has a spherical portion (17a) having a generally spherical shape, a coupling protrusion (17b) projecting radially outward from the spherical portion, and a through-hole provided through the spherical portion. A hole (17c) and a cut (17h) penetrating the spherical portion from the through hole along a plane including the axis of the through hole, and the tip of the coupling projection (17b) is formed in the hole (5a) of the connection portion (5). ) Should be dimensioned so that it can be manually pressed into The slit (17h) of the connecting member (17) has a size that allows the flexible connecting portion (4) to be pushed through by hand, and the through hole (17c) of the connecting member has the flexible connecting portion. (4) has a dimension that can be fitted therein.
[0011]
The coupling member body (7) penetrates a spherical portion (7a) having a generally spherical shape, a coupling protrusion (7b) projecting radially outward from the spherical portion (7a), and a spherical portion (7a). The coupling projection (7b) is dimensioned to be manually press-fitted into the through-hole (7c).
The coupling member main body (7) is preferably made of a resin material.
The four coupling protrusions (7b) are provided at equal intervals of approximately 90 degrees on the circumference of the spherical portion (7a), and the through-holes (7c) are provided with respect to the four coupling protrusions (7b). It may be provided substantially through the spherical portion (7a) in a substantially perpendicular direction.
The coupling projection (7b) is formed with an annular projection (7d), and the tip (7e) of the coupling projection (7b) is preferably formed in a substantially hemispherical shape.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
FIG. 1 is a perspective view of a playground equipment 1 of the present invention. The play equipment 1 includes a flexible connecting rod or flexible pipe 2 and a connecting member or pod 3.
[0013]
(About flexible pipe 2)
The flexible pipe 2 includes a connecting portion 4 and connecting portions, that is, joint balls 5 provided at both ends of the connecting portion 4. The connecting portion 4 is flexible and can maintain its deformed state by itself when it is bent or twisted, so that it can be easily expanded and contracted only by a person applying ordinary force by hand. It is good to be made of material without. For example, a flexible tapping tube used for a water heater or a rod-shaped member coated with a metal wire (wire) with a resin may be used. In the present embodiment, the connecting portion 4 is made of an interlock type flexible tube (3 / 8B) manufactured by Showa Spiral Tube Co., Ltd. In this method, a metal strip is wound while being spirally engaged. The material is copper, iron, stainless steel, or the like. In this embodiment, the material is made of stainless steel. The joint ball 5 may be made of wood, but is preferably made of a resin material.
[0014]
FIG. 2 is a cross-sectional view showing a connection portion between the joint ball 5 and the connecting portion 4. The joint ball 5 has a connection hole 5a connected to a connection protrusion 7b (described later) of the pod 3, a connection hole 5c connected to the connection portion 4, and a communication hole connecting the connection hole 5a and the connection hole 5c. 5b are formed. A well nut 6 made of elastic rubber is inserted into the connection hole 5c. The well nut 6 is provided with a female screw portion 6a made of metal. One end 4 a of the connecting portion 4 is put on the well nut 6, and the one end 4 a is inserted into the connection hole 5 c of the joint ball 5. The screw 9 is inserted from the coupling hole 5 a and screwed into the female screw portion 6 a of the well nut 6. As the screw 9 is tightened, the diameter of the well nut 6 gradually increases, and the connecting portion 4 is fixed so as not to come off from the joint ball 5.
The flexible pipe 2 may have a plurality of lengths such as 30 cm, 60 cm, and 90 cm.
[0015]
(About Pod 3)
The pod 3 includes a main body 7 and pins 8. FIG. 3 is a perspective view of the main body 7. FIG. 4 is a perspective view of the pin 8.
Referring to FIG. 3, the body 7 of the pod 3 has a spherical portion 7a having a substantially spherical shape as a whole, and four coupling protrusions 7b provided at equal intervals of 90 degrees on the circumference of the spherical portion 7a. And a through hole 7c penetrating the spherical portion 7a in a direction perpendicular to the four coupling projections 7b. The coupling projection 7b is made to have a size that can be manually pressed and fitted into the coupling hole 5a of the joint ball 5. Two annular projections 7d are formed on the coupling projection 7b to prevent the fitted coupling projection 7b from easily falling out of the coupling hole 5a. The distal end 7e of the coupling projection 7b is formed in a substantially hemispherical shape to facilitate insertion into the coupling hole 5a. The pod 3 may be made of wood, but is preferably made of a resin material.
[0016]
Referring to FIG. 4, pin 8 includes a cylindrical portion 8a, substantially hemispherical distal portions 8b formed at both ends of cylindrical portion 8a, and a retaining member formed near each distal portion 8b. And two annular projections 8c. The pin 8 is dimensioned so that it can be pressed into the through-hole 7c of the main body 7 by hand. When the pin 8 is inserted into the through hole 7c of the main body 7, as shown in FIG. 1, the six connecting projections project from the main body 7 in six directions at an angle of 90 degrees. The pin 8 may be made of wood, but is preferably made of a resin material.
[0017]
(Example of use of play equipment 1)
FIG. 5 shows an example of use when the playground equipment 1 of the present invention is used in a nursing school.
First, a teacher of a school for disabled children holds a joint ball 5 at both ends of the flexible pipe 2 with both hands, and shows a sample in which both hands are raised as shown in FIG. The student at the school for the disabled can hold both hands by holding the flexible pipe 2 and imitate the teacher to raise both hands. Next, as shown in FIG. 5B, the upper body is shaken left and right while both hands are raised, or the upper body is tilted back and forth as shown in FIG. 5C. Since the flexible pipe 2 does not expand and contract, the student can maintain a sense of tension in his hand, and can move his body by imitating the teacher.
[0018]
In addition, as shown in FIG. 6, the flexible pipe 2 can be bent or extended with both hands. FIG. 6A is a diagram showing a state in which the joint portion 4 is bent by holding the joint ball 5 of the flexible pipe 2 with both hands. FIG. 6B is a diagram showing a state in which the joint portion 5 of the flexible pipe 2 is held by both hands and the connecting portion 4 is extended. Unlike the coil spring for strength training, the connecting part 4 is made of a flexible tapping pipe wound around a metal strip while being spirally engaged, so that even a student at a school for a nursing school can easily bend or stretch it. Or you can. Here, the term “stretch” of the flexible pipe 2 means that the flexible pipe 2 is in a substantially straight original state, and does not mean that the length of the flexible pipe 2 becomes longer or shorter.
[0019]
Next, an example in which a plurality of flexible pipes 2 are connected and used by a pod 3 or a pin 8 will be described. FIG. 7 is a diagram showing a state where two flexible pipes 2 are connected by a pod 3. The connecting protrusion 7b of the pod 3 is fitted into the connecting hole 5a of the joint ball 5 of the flexible pipe 2, and the connecting hole 5a of the joint ball 5 of another flexible pipe 2 is connected to the connecting protrusion 7b opposite to the connecting protrusion 7b. The two flexible pipes 2 are fitted and connected by a pod 3. FIG. 8 is a diagram showing a state where two flexible pipes 2 are connected by pins 8. One end of the pin 8 is fitted into the joint hole 5a of the joint ball 5 of the flexible pipe 2, and the other end of the pin 8 is fitted with the joint hole 5a of the joint ball 5 of another flexible pipe 2. 2 are connected by pod 3.
[0020]
FIG. 9 is a view showing a large loop formed by connecting six flexible pipes 2 with pins 8. Students can play in the train in such a big circle. FIG. 10 is a diagram showing a state in which a student at a school for the disabled is playing a train using the playground equipment 1 of the present invention. Although the flexible pipe 2 is flexible, it does not bend like a rope or expand and contract like a rubber cord, so that it is possible to play a train well. FIG. 11 is a diagram illustrating a state in which a student of a school for the disabled plays a train by using a string 10 such as a skipping rope. Since the student cannot maintain the tension of the string 10 well, the string 10 flexes and gradually attaches to the previous person. Eventually, you can't play trains well after getting into dumplings. On the other hand, since the flexible pipe 2 of the present invention can maintain its shape even when a certain amount of force is applied from the outside, it is possible to play the train well as shown in FIG.
[0021]
FIG. 12 is a diagram showing a state where a player passes through a tunnel using the playground equipment 1 of the present invention. The flexible pipe 2 and the pod 3 can be connected to form a tunnel as shown in FIG.
[0022]
The pod 3 can be folded with three legs as shown in FIG. Using this, a deformed tunnel can be created as shown in FIG. That is, by setting one pod 3 in the center and extending the flexible pipe 2 from the pod 3 to three directions, a circular tunnel can be formed. Various tunnels can be created by combining such tunnels or by creating and combining further tunnels.
[0023]
Note that, for example, even when only the pod 3 is used, hand training can be performed. FIG. 15 shows a case where only the main body 7 of the pod 3 is connected. By connecting the connecting protrusion 7b of one main body 7 to the through hole 7c of the other main body 7, creative play can be achieved. The main body 7 has such a size that even a person whose fingertip trembles due to nervous disorder, or a person with dysfunction without a finger can grasp the palm without using the fingertip. Therefore, the main body 7 alone has a puzzle-like element, and a creative work can be created by combining only a plurality of main bodies 7, and the function recovery, rehabilitation, and independence of a person with a disability can be achieved. Can be used as teaching material for
[0024]
In this way, by using the playground equipment 1 of the present invention, a student at a school for the disabled can enjoy various exercises based on ideas.
[0025]
(Another embodiment)
Next, another embodiment of the pod body will be described.
FIG. 16 is a perspective view of a pod body 17 of another embodiment, and FIG. 17 is a plan view of the pod body 17 of another embodiment. Although the pod 3 is intended to be connected to the joint ball 5 of the flexible pipe 2, the pod body 17 of another embodiment is a pod that can be connected to the connecting portion 4 of the flexible pipe 2. Hereinafter, the pod body 17 of another embodiment is referred to as a three-pin pod 17.
[0026]
Referring to FIGS. 16 and 17, the three-pin pod 17 includes a spherical portion 17a provided with a cutout 17h, and three coupling protrusions 17b provided at 90-degree intervals on the circumference of the spherical portion 17a. And a through hole 17c penetrating the spherical portion 17a in a direction perpendicular to the three coupling projections 17b. The slit 17h communicates with the through hole 17c. The coupling projection 17b is made to have a size that can be press-fitted into the coupling hole 5a of the joint ball 5 by hand. Two annular projections 17d are formed on the coupling projection 17b in order to prevent the fitted coupling projection 17b from easily coming out of the coupling hole 5a. The distal end 17e of the coupling projection 17b is formed in a substantially hemispherical shape to facilitate insertion into the coupling hole 5a.
[0027]
Since the 3-pin pod 17 is provided with the slit 17h, the connecting portion 4 of the flexible pipe 2 can be fitted into the through hole 17c through the slit 17h as shown in FIG. The dimensions of the slit 17h and the through-hole 17c are determined so that the connecting portion 4 can be press-fitted by hand and fitted, and does not come off or slip even when a certain external force is applied, but can be easily removed by hand. It is good to have been. By combining such a three-pin pod, the playground equipment 1 of the present invention can further form various forms more freely, and can change the way of gymnastics.
[0028]
【The invention's effect】
As is clear from the above description, according to the present invention, a flexible connecting rod that can be used in a nursing school, a welfare facility for the aged, a rehabilitation site of a hospital, an English conversation classroom for infants, etc. It is possible to provide a flexible connecting rod capable of maintaining a sense of tension in both hands without expanding and contracting when pressed or pushed. By using this flexible connecting rod, it is possible to give various changes to the way of playing and gymnastics, and to develop into gymnastics rich in ideas. In particular, in a school for the disabled, students can enjoy playing on the train.
Further, according to the play equipment comprising the flexible connecting rod and the connecting member of the present invention, by assembling them three-dimensionally, it is possible to further develop a game such as tunneling or a gymnastics manner.
Furthermore, by using the play equipment comprising the flexible connecting rod and the connecting member of the present invention, students can work their own creation and create a three-dimensional object as they like. It can be combined with only the connecting member, and the creativity of the students can be improved.
[0029]
The present invention is not limited to the above embodiments, and can be embodied in other various forms without departing from the characteristics thereof. Therefore, the above-described embodiment is merely an example in all aspects, and the dimensions and materials of the members shown in the embodiment are examples for facilitating the understanding of the invention, and are not to be interpreted in a limited manner. Not be. The scope of the present invention is defined by the appended claims, and is not limited by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.
[Brief description of the drawings]
FIG. 1 is a perspective view of a playground equipment 1 of the present invention.
FIG. 2 is a cross-sectional view showing a connection portion between a joint ball 5 and a connecting portion 4;
FIG. 3 is a perspective view of a main body 7 of the pod 3;
FIG. 4 is a perspective view of a pin 8;
FIG. 5 is a diagram showing one usage example when the playground equipment 1 of the present invention is used in a school for the disabled.
FIG. 6 is a view for explaining a motion of bending and extending the flexible pipe 2 with both hands.
FIG. 7 is a diagram showing a state in which two flexible pipes 2 are connected by a pod 3;
FIG. 8 is a view showing a state in which two flexible pipes 2 are connected by pins 8;
FIG. 9 is a view showing a large loop formed by connecting six flexible pipes 2 with pins 8;
FIG. 10 is a diagram showing a state in which a student at a school for the disabled is playing a train using the playground equipment 1 of the present invention.
FIG. 11 is a view showing a state in which a student of a school for the disabled plays a train by using a string 10 such as a skipping rope.
FIG. 12 is a diagram showing a state where a player passes through a tunnel using the playground equipment 1 of the present invention.
FIG. 13 is a view showing a state in which the pod 3 stands on three legs.
FIG. 14 is a view showing a modified tunnel.
FIG. 15 is a diagram showing a state where only the main body 7 of the pod 3 is connected.
FIG. 16 is a perspective view of a pod body 17 according to another embodiment.
FIG. 17 is a plan view of a pod body 17 according to another embodiment.
FIG. 18 is a view showing a state in which the connecting portion 4 of the flexible pipe 2 is fitted into the through-hole 17c through the slit 17h of the 3-pin pod 17.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 play equipment 2 flexible pipe 3 pod 4 flexible connecting part 5 joint ball 5 a connecting hole 7 pod body 7 a, 17 a spherical part 7 b, 17 b connecting protrusion 7 c, 17 c through hole 7 d annular protrusion 7 e tip 8 pin 17 3 pin pod 17h carving

Claims (14)

A flexible connecting rod for use in play,
An elongated flexible connecting portion that is deformable and capable of maintaining a deformed shape,
A flexible connecting rod provided at both ends of the flexible connecting part and having a substantially spherical connecting part having a hole. 2. The flexible connecting rod according to claim 1, wherein the flexible connecting portion is formed by winding a metal strip while spirally engaging the metal strip. 3. The flexible connecting rod according to claim 1, wherein the flexible connecting portion is formed by coating a wire with a resin material. The flexible connecting rod according to claim 1, wherein the connecting portion is made of a resin material. A coupling member having a main body and a pin,
The main body includes a spherical portion having a spherical shape as a whole, a coupling protrusion projecting radially outward from the spherical portion, and a through-hole provided through the spherical portion,
The pin may be manually press-fitted into the through hole and fitted therein, and when fitted, the pin has a length such that both ends of the pin can protrude radially outward from the spherical portion. A coupling member characterized by the following. The coupling member according to claim 5, wherein the main body and the pin are made of a resin material. The four coupling projections are provided at equal intervals of approximately 90 degrees on the circumference of the spherical portion, and the through-holes extend in a direction substantially perpendicular to the four coupling projections. The connecting member according to claim 5, wherein the connecting member is provided so as to pass therethrough. The coupling member according to claim 5, wherein an annular projection is formed on the coupling projection, and a tip end of the coupling projection is formed in a substantially hemispherical shape. A three-dimensionally assembled play equipment comprising a flexible connecting rod and a connecting member,
The flexible connecting rod,
An elongated flexible connecting portion that is deformable and capable of maintaining a deformed shape,
A substantially spherical connection portion having holes is provided at both ends of the flexible connection portion,
The coupling member includes a main body and a pin,
The main body includes a spherical portion having a spherical shape as a whole, a coupling protrusion projecting radially outward from the spherical portion, and a through-hole provided through the spherical portion,
The pin has a length such that both ends of the pin can be pressed into the through hole by hand and both ends of the pin can protrude radially outward from the spherical portion when the pin is fitted. Yes,
The three-dimensionally assembled play equipment, wherein a tip of the coupling projection and both ends of the pin have dimensions that can be manually pressed and fitted into the holes of the connection part. A three-dimensionally assembled play equipment comprising a flexible connecting rod and a connecting member,
The flexible connecting rod,
An elongated flexible connecting portion that is deformable and capable of maintaining a deformed shape,
A substantially spherical connection portion having holes is provided at both ends of the flexible connection portion,
The coupling member,
A spherical part with a spherical shape as a whole,
A coupling projection protruding radially outward from the spherical portion;
A through-hole provided through the spherical portion,
Cutting through the spherical portion from the through hole along a plane including the axis of the through hole,
The tip of the coupling projection has a dimension that can be manually pressed into and fitted into the hole of the connection portion,
The split of the coupling member has a size that allows the flexible connecting portion to be pushed through by hand,
The three-dimensionally assembled play equipment, wherein the through-hole of the coupling member has a size capable of fitting the flexible connecting portion. A spherical part with a spherical shape as a whole,
A coupling projection protruding radially outward from the spherical portion;
Having a through-hole provided through the spherical portion,
The coupling member main body, wherein the coupling protrusion has a size capable of being manually fitted into the through hole by press-fitting. The coupling member main body according to claim 11, wherein the coupling member main body is made of a resin material. The four coupling projections are provided at equal intervals of approximately 90 degrees on the circumference of the spherical portion, and the through-holes extend in a direction substantially perpendicular to the four coupling projections. The coupling member main body according to claim 11, wherein the coupling member main body is provided so as to penetrate through. 14. The coupling member body according to claim 11, wherein an annular projection is formed on the coupling projection, and a tip end of the coupling projection is formed in a substantially hemispherical shape.

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