JP2003205059A - Ski shoes attachment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To satisfactorily hold a rotary shaft which becomes the center of bending distortion by reducing the weight of a plate for fixing a shoe and increasing rigidity so as to make bending distortion difficult to occur and precisely transmitting operation force to a ski without delay for avoiding the bending distortion of the ski. <P>SOLUTION: The connecting side part of the plate 2 for fixing the shoe is made to be cylindrical to form an inner space 7 surrounded by upper/lower/ right/left walls 15, 16, 22, or the like. A slider 11 provided with the rotary shaft 12 at a right angle to the longitudinal direction of the ski 34 is housed in the space 7 in a state where the slider 11 can be brought into contact with upper/lower/right/left inner surfaces. A base 13 is interposed between the connecting side part and the ski 34. An arm part 31 for inserting the shaft 12 of the slider 11 is provided at the base 13 to share the rotary shaft 12. A space for moving back and forth and rocking the base 13 with respect to the plate 2 is formed in front and rear of the arm part 31, and the base 13 can be fixed to the ski 34 by using a bonding member 14. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ski boot mounting device interposed between a ski boot fastener and a ski for fixing and mounting the ski boot on the ski.

[0002]

2. Description of the Related Art Conventionally, a ski shoe is firmly fixed to a ski during exercise such as skiing so that an operating force applied to the ski shoe can be accurately transmitted without delay. But,
When the skis are subjected to operating force from the feet, the skis will be bent forwards and backwards, and bending deformations such as twisting will occur. I have to. Therefore, a device for fixing a ski shoe and mounting it on a ski is used by being interposed between the ski shoe fastener and the ski.

As such a ski shoe mounting device, for example, in Japanese Patent Laid-Open No. 2001-70496, a box-shaped shoe fixing plate without a lower surface for mounting a ski shoe fastener has front and rear opening portions on both left and right walls, and forwardly. Vertical plates with round holes through which the rotary shafts pass, and vertical plates with slide plates with round holes through which the rotary shafts pass are fitted and fixed, respectively.
On the front and back of the ski, there are shown rotating shafts each having a direction perpendicular to the traveling direction.

[0004]

However, in such a ski boot mounting device, the box-shaped shoe fixing plate does not have a lower surface, and there are large openings at the front and rear of the left and right walls thereof. Therefore, it is difficult to increase the rigidity of the shoe fixing plate,
Flexural deformation such as bending and twisting easily occurs in the front and rear.
In addition, since the vertical plates supporting both ends of both the front and rear rotation shafts attached to the ski are fitted and fixed to the large openings provided on the front and rear of the left and right walls of the shoe fixing plate, respectively,
There is a risk that the vertical plate may fall out of the opening due to insufficient holding of the rotating shaft by the shoe fixing plate.

The present invention has been made in view of the above-mentioned problems of the prior art. The shoe fixing plate is light in weight and has high rigidity so that flexural deformation is unlikely to occur and the operating force is increased by the ski. It is an object of the present invention to provide a ski boot mounting device that can accurately transmit the ski without delay and does not hinder the flexural deformation of the ski, and can favorably hold the rotating shaft that is the center of the flexural deformation.

[0006]

In order to achieve the above object, in a ski shoe mounting device according to the present invention, a ski fixing is interposed between a ski shoe fastener and a ski plate to fix the ski boot and mount it on the ski plate. A connecting mechanism having a rotating shaft used for connecting to the ski is attached to one of the front and rear portions of the ski plate, and the connecting mechanism is composed of a slider, a base and a connecting member.

At least the side portion of the shoe fixing plate to which the connecting mechanism is attached is made cylindrical to form an internal space surrounded by upper, lower, left and right walls, and the longitudinal direction of the ski in the internal space of the connecting side portion. A sliding element provided with a rotation axis at a right angle is stored so that it can come into contact with the upper, lower, left, and right inner surfaces, a base is interposed between the connecting side and the ski, and the rotation axis of the slider is inserted into the base. An arm portion is provided to share a rotation axis, and a space is provided in the front and rear of the arm portion to allow the base to move back and forth with respect to the shoe fixing plate and to swing. It can be fixed to.

Further, the inner space of the connecting side portion of the shoe fixing plate is divided into a plurality of partitions by providing a partition wall extending in the longitudinal direction of the shoe fixing plate, and the turning shaft is shared in each of the divided inner spaces. It is preferable to house the slides respectively, and to form a rotation shaft moving hole in the partition wall through which the rotation shafts of the slides can be inserted and which allows the rotation shafts to move forward or backward within a certain range.

Further, a slipper insertion opening for inserting into the internal space is provided at an end surface of the connecting side portion of the shoe fixing plate, and a rotating shaft is inserted into a side of the connecting side portion into a rotating shaft mounting hole of the slider. A rotation shaft insertion hole for insertion is provided, an arm insertion hole for inserting the arm part of the base is provided on the bottom surface of the connecting side part, and the arm part is further inserted into the slider, and the arm part is inserted into the arm part. It is advisable to provide an arm insertion hole for inserting the rotation shaft in the provided hole.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying FIGS. FIG. 1 is a left side view showing a structure of a main part of a ski shoe mounting device to which the present invention is applied when the ski shoe mounting device is in use. FIG. FIG. 3 is a perspective view showing the shoe fixing plate that constitutes the main part, the parts attached to the front and rear parts of the plate, the set screws, the rotation shaft, and the corresponding positional relationship with other parts, as seen from the upper left side. It is the perspective view seen from the lower left. This ski shoe mounting device 1 is interposed between a ski shoe fastener and a ski, and a ski fixing plate 2 for fixing a ski shoe and mounting it on the ski, and ski plates attached to front and rear portions 3 and 4 of the plate 2, respectively. It is composed of attachment parts 5 and 6.

In order to reduce the weight and increase the rigidity of the shoe fixing plate 2, for example, a rectangular plate-shaped cylindrical body made of metal such as aluminum is used. Further, in order to increase the rigidity of the internal space 7, the plate 2
Depending on the width (length in the widthwise direction) of the partition wall, one or more partition walls 8 are provided along the lengthwise direction. At this time, if a partition wall 8 is provided at one location, for example, in the center of the internal space 7, substantially the same partitioned internal spaces 7a and 7b that are divided into the left and right can be formed.

A base 9 and two setscrews 10 (1) are attached to the front portion 3 of the shoe fixing plate 2 as attachment parts 5.
0a, 10b) and the like are used. Further, the rear part 4 has two sliders 11 (11a, 11b), 1
Rotating shaft 12, base 13, four set screws 14 (14
14d) and the like are used, and a connecting mechanism for attachment is formed by assembling them, screwing, or the like. Therefore, the screw insertion holes 17 (17) penetrating the upper and lower walls 15 and 16 are separated leftward and rightward at positions near the front ends of the upper and lower walls 15 and 16 of the plate front portion 3.
a, 17b) and screw mounting holes 18 (18a, 18b) are provided, respectively. At that time, each screw insertion hole 17 provided in the upper wall 15
Is set to pass through to the head of the set screw 10, and each screw mounting hole 18 provided in the lower wall 16 is set to pass through only the threaded portion of the set screw 10. Further, as the front base 9, a rectangular flat rubber plate, a plastic plate, or the like is adopted as a part having some elasticity. Then, a screw mounting hole 19 through which only the threaded portion of the set screw 10 is passed to the corresponding position of the front base 9
(19a, 19b) are provided respectively.

Further, the plate rear portion 4 is disposed in a substantially square shape at positions near the rear ends of the upper and lower walls 15 and 16 and is arranged in a substantially square shape, and a screw insertion hole 20 (20) penetrating the upper and lower walls 15 and 16 is formed.
, 20d) and 21 (21a, ... 21d) are provided respectively. At this time, each screw insertion hole 20 provided in the upper wall 15 has a hole diameter that passes to the head of the set screw 14. But,
Each of the screw insertion holes 21 provided in the lower wall 16 does not have a hole diameter through which the head of the set screw 14 can easily pass, but has a hole diameter that allows the head to move particularly in the front-back direction in the hole. In the front-back direction.

Rotating shaft insertion holes 24 (24a, 24b) penetrating the left and right walls 22, 23 of the plate rear portion 4 are provided at positions near the rear ends of the left and right walls 22, 23, respectively. At that time, the position of the rotary shaft insertion hole 24 is provided slightly rearward of the position where the rotary shaft 12 is completely assembled. It should be noted that the left and right walls 22 and 23 are required to have the highest rigidity at the time of high-speed turn, etc., as compared with the upper and lower walls 15 and 16, but there are only one rotary shaft insertion hole 24 having a small hole diameter. Therefore, the rigidity is not significantly impaired.

Further, the through holes 25 (25
a, 25b) respectively. Both of these through holes 25 are holes for inserting both arm portions of the rear base 13 which will be described later into each other and allowing the arms to move back and forth. Provide each in the vicinity. The elongated through-holes 26 in the front and rear in the center of the four screw insertion holes 21 provided in the lower wall 16 are processed holes when partly cutting the partition wall 8.

Since the attachment connecting mechanism is formed on the plate rear portion 4 as described above, the two sliders 11 can be housed side by side in both of the compartment internal spaces 7 of the rear portion 4 and can be brought into contact with the corresponding upper, lower, left and right walls. Make it Therefore, each slide 1
A rectangular flat plate made of plastic or the like is used as a component 1 having a cross-sectional shape that is slightly smaller than the cross-sectional shape of each section internal space 7 and has substantially the same cross-sectional shape. And
Each of the sliders 11 is provided with two screw insertion holes 27 (27a, ..., 27d) which are separated from each other in the front-rear direction and penetrate in the vertical direction.

In addition, one corresponding to each slider 11 is provided 2
A long hole 28 (28a, 28b) is formed in the front and rear of the screw insertion hole 27 slightly apart from the outside, and each hole diameter is such that both arm portions of the rear base 13 described below can be inserted. Say it. However, the major axis of each arm insertion hole 28 is set to a length that allows the arm fitted in the hole to swing. Further, each slide 11 is further provided with a rotary shaft mounting hole 29 penetrating the center thereof to the left and right. In addition, each rotary shaft mounting hole 2
All 9 are designed to penetrate through the center of the left and right inner surfaces of the corresponding arm insertion assembly hole 28.

A substantially square flat plate made of metal such as stainless steel is used for the rear base 13, and holes extending vertically are provided near the four corners of the flat plate, and the set screw 1
4 mounting holes 30 (30a, ... 30d). However, each screw mounting hole 30 has a hole diameter through which only the screw portion of the set screw 14 passes. In addition, arm portions 31 (31a, 31b) are provided so as to project upward from the vicinity of each center of the left and right side surfaces of the rear base 13. Moreover, each arm portion 31 has a semicircular shape at the tip end,
Mounting holes 32 (32a, 32b) through which the rotary shaft 12 passes
Are provided respectively.

When mounting such a ski shoe mounting device 1 on a ski, first of all, two slides 11 are inserted into the respective compartment internal spaces 7 from the end face openings of the rear portion 4 of the shoe fixing plate 2. Then, both sliders 11 are moved forward to the storage position where the rotary shaft 12 can be inserted. Next, both arms 32 of the rear base 13 are inserted through the corresponding elongated arm insertion holes 25 provided in the lower wall 16 of the plate rear portion 4 into the arm insertion assembly holes 28 of both slides 11, respectively. Fit. Therefore, the rear base 13 is positioned so that the rotary shaft mounting holes 29 of the both slides 11 and the rotary shaft mounting holes 32 provided in both arms 31 of the rear base 13 are aligned.

Next, the rotary shaft 12 is inserted through a rotary shaft insertion hole 24 provided on one side surface of the plate rear portion 4, for example, the left wall 22, and the both slides 11 and the rear base 1 are moved by the rotary shaft 12.
3 and both arm portions 31 are inserted. At that time, the rotary shaft 12 is inserted near the rear end of the rotary shaft moving hole 33 provided in the partition wall 8 as shown in FIG. Therefore, the rotary shaft 12 is shared by the sliders 11 housed in the internal space 7 on the connecting side and the rear base 13 located outside, and is easily assembled. 11 and the rear base 13 can be used as a rotation axis that serves as a center of individual rotation. It should be noted that such a structure allows the internal space 7 on the connecting side portion to be large, so that the inserted slider 11 also becomes large, and the contact area between the plate rear portion 4 and each slider 11, and each slider. 11 and rotation axis 1
The contact area with 2 becomes large, and the rigidity and durability of the entire ski boot mounting device are improved.

Next, by utilizing the longitudinal length of the arm insertion hole 25 provided in the lower wall 16 of the plate rear portion 4, the both sliders 11 and the rear base 13 are screwed to the base 13. Move a little further forward to the possible storage position. Then, the rotary shaft 12 is displaced from the position of the rotary shaft insertion hole 24,
Both end surfaces of the rotary shaft 12 are covered with the left and right walls 22 and 23, respectively, and can be favorably supported, so that the rotary shaft 12 can be prevented from coming off. Moreover, when both slides 11 are moved to the storage position where the assembly is completed, the positions of the four screw insertion holes 27 provided in both slides 11 correspond to the respective screw insertion holes 20 provided in the plate rear portion 4,
21 and each match. In addition, the corresponding screw mounting holes 30 provided on the rear base 13 also coincide with each other.

Therefore, the shoe fixing plate 2 is placed on the center of the upper surface of the ski, the base 9 is interposed between the front 3 of the ski and the ski, and the base 13 is interposed between the rear 4 of the ski and the ski. Intervene. Then, two setscrews 10 are respectively inserted from the respective screw insertion holes 17 of the plate front portion 3, and the lower wall 16 of the plate front portion 3 is screwed together with the base 9 to the ski. Also, by inserting four setscrews 14 from the respective screw insertion holes 20 of the plate rear portion 4 and further inserting the respective screw insertion holes 27 of both slides 11, the base 13 can be easily screwed to the ski. it can. The setscrews 10 and 14 are attached to the screw insertion holes 18 and 1 before being mounted on the ski.
When it is inserted and prepared in 9, 30, the head of the set screw 14 contacts the rear wall of the screw insertion hole 21, so that the rotary shaft 12 cannot return to the position of the rotary shaft insertion hole 24, so that it does not fall off.

In this way, the front portion 3 of the shoe fixing plate 2 is tightly attached to the ski with the base 9 interposed therebetween, and the rear portion 4 is attached to the ski through the connecting mechanism, whereby the ski boot is formed. The work of attaching the mounting device 1 to the ski is completed, and the ski shoe mounting device 1 is completed. Therefore,
5, 6 and 7 are perspective views showing the external appearance of the completed ski shoe mounting apparatus 1 as seen from above and below and the partial internal structure of the main part, and the partial internal structure of the main part is shown in detail in FIGS. And 10
Is shown in a sectional view. 8 is a sectional view taken along line XX of FIG. 7, FIG. 9 is a sectional view taken along line YY of FIG. 7, and FIG. 10 is taken along line ZZ of FIG.
FIG.

After the ski boot mounting device 1 is mounted on the ski 34 as shown in FIG. 1, the toe fastener 35 and the heel fastener 36 are fixed on the shoe fixing plate 2 respectively. . Then, the ski shoes 37 are attached to those bindings 3
It can be fixed using 5, 36. Then, skiing and the like can be performed.

During skiing, the shoe fixing plate 2 is light in weight because it is entirely cylindrical, and a partition wall 8 extending in the longitudinal direction is provided at the center of the internal space 7 to partition the centers of the upper and lower walls 15, 16. Since they are connected by the wall 8, the rigidity is increased and the shoe fixing plate 2 is less likely to be deformed. Moreover, the front portion 3 of the shoe fixing plate 2 is tightly attached to the ski 34 with the base 9 interposed therebetween, and the rear portion 4 thereof is attached via the connecting mechanism. Therefore, ski shoes 3
The operating force applied to 7 can be accurately transmitted to the ski 34 without delay through the front base 9 and the connecting mechanism.

At that time, as shown in FIG.
Since the base 9 has some elasticity on the front side of the vicinity of the base 9, the flexure deformation such as front and rear bending and twisting slightly occurs, and the connection mechanism is formed on the rear side of the vicinity of the connection mechanism of the ski 34. The sliding member 11 is provided with a rotating shaft 12 serving as a center of flexural deformation, the sliding member 11 slides back and forth inside the shoe fixing plate 2, and a base 13 sharing the rotating shaft 12 is provided outside. Since the shoe fixing plate 2 can be moved back and forth and rocked, a large flexural deformation can be caused. Moreover, the shoe fixing plate 2 does not hinder the flexural deformation. The two sliders 11 that form the connecting mechanism and the rotating shaft 12 that passes through the center of the slider 11 to the left and right are housed in the internal space 7 of the shoe fixing plate 2, and both end surfaces of the rotating shaft 12 are also plates. Since it is covered by the left and right walls 22 and 23, the rotating shaft 12 can be held well.

In this way, the flexural deformation of the ski 34 on the front side of the vicinity of the base 9 is reduced and the flexural deformation of the rear side of the ski on the rear side of the coupling mechanism is increased. You can ski properly by pressing down on the snow surface on the front side and flexing the back side greatly. If a pivot is provided on the front side of the ski, the front side is excessively flexed, which makes it difficult to hold down the snow surface, making it unsuitable for skis for high-speed turns.

In the above-described embodiment, the shoe fixing plate 2 is entirely cylindrical, but only the side portion of the plate 2 to which the connecting mechanism is attached is cylindrical to form an internal space, and the inside of the connecting side portion is formed. It is also possible to store the slider in the space.

In the above embodiment, the shoe fixing plate 2 is formed into a tubular shape, and the partition wall 8 extending in the longitudinal direction is provided in the internal space 7 of the shoe fixing plate 2 to divide the internal space. However, in order to simplify the structure of the apparatus. Alternatively, the shoe fixing plate may be provided with no partition wall and only one slipper may be stored.

Further, in the above embodiment, the connecting mechanism is attached to the rear portion 4 of the shoe fixing plate 2. However, if it is desired to increase the flexural deformation of the front side of the ski, the connecting mechanism should be attached to the front portion of the plate. You can also

Further, in the above embodiment, the shoe fixing plate 2 is formed into a tubular shape as a whole, and openings are provided at the front and rear end surfaces thereof. Further, the plate front portion 3 is provided with a screw insertion hole 17, and the plate rear portion 4 is provided with a screw insertion hole 20. Although the openings such as the rotary shaft insertion hole 24 and the processed hole 26 are left, the aluminum plate is attached with an adhesive tape or closed with a filler to prevent snow from entering through the openings. You can also do it.

[0032]

According to the present invention described above, claim 1
In the invention described, at least the side portion of the shoe fixing plate to which the connecting mechanism is attached is formed into a tubular shape to form the internal space surrounded by the upper, lower, left, and right walls. Therefore, the shoe fixing plate is light and has high rigidity. As a result, it is possible to make it difficult for flexural deformation to occur. Therefore, when the device is attached to the ski, the operating force applied to the ski can be accurately transmitted to the ski through the coupling mechanism without delay. Then, on the side of the ski where the connecting mechanism is attached, the slider that constitutes the connecting mechanism is provided with a rotation axis that serves as the center of flexural deformation, and the slider moves forward and backward inside the shoe fixing plate. Since the base, which can be slid on and shares the pivot axis thereof, can be moved back and forth and swing with respect to the shoe fixing plate outside, a large flexural deformation can be generated. Moreover, the shoe fixing plate does not hinder the flexural deformation of the ski. Also, the rotation shaft of the connecting mechanism is shared by the slider and the base, is housed in the internal space of the shoe fixing plate, and both end surfaces of the rotation shaft are covered by the left and right walls of the plate. The moving shaft can be held well.

According to the second aspect of the present invention, the inner space of the shoe fixing plate is divided into a plurality of partitions by providing a partition wall along the longitudinal direction of the shoe fixing plate, and the partition walls are respectively provided in the respective inner spaces. The rigidity of the shoe fixing plate can be further increased by forming the moving hole of the rotating shaft shared by the stored sliding elements.

According to the third aspect of the present invention, the slider is inserted into the internal space through the opening provided at the end surface of the connecting side portion of the shoe fixing plate, and the arm inserting hole is provided at the bottom surface of the connecting side portion. Insert the arm part of the base, insert the arm part into the arm part insertion hole provided on the slider, and insert the rotary shaft from the rotary shaft insertion hole provided on the side wall of the connecting side part. Thus, it can be inserted into the rotation shaft installation hole of the slider and the hole provided in the arm portion. Therefore, the slider accommodated in the internal space of the connecting side portion of the shoe fixing plate and the outer base can be easily assembled with the pivot axis being shared.

[Brief description of drawings]

FIG. 1 is a left side view showing a main structure in a state where flexure deformation of a ski to which a ski shoe mounting device to which the present invention is applied does not occur is obtained by partially removing a left wall of a front and rear portion of a shoe fixing plate. It is a figure.

FIG. 2 is a left upper side showing a corresponding positional relationship between a shoe fixing plate that constitutes a main part of the ski boot mounting device, front and rear parts of the plate, set screws, a rotation shaft, and other parts. It is the perspective view seen from.

FIG. 3 is a perspective view corresponding to FIG. 2, seen from the lower left.

FIG. 4 is a perspective view seen from the upper left side with a part of the upper left wall of the rear portion of the shoe fixing plate constituting the main part of the ski shoe mounting device removed.

FIG. 5 is a perspective view of an essential part structure of the ski boot mounting device, which is viewed from the upper left side, in which the upper left wall of the front and rear parts of the shoe fixing plate is partially removed.

FIG. 6 is a perspective view of the ski shoe mounting device as viewed from the lower left.

FIG. 7 is a perspective view of the ski boot mounting device as seen from the lower left near the side.

8 is a cross-sectional view taken along line XX of FIG.

9 is a sectional view taken along line YY of FIG. 7.

10 is a sectional view taken along line ZZ of FIG.

FIG. 11 is a left side view corresponding to FIG. 1, showing the main structure when the ski having the ski boot mounting device attached thereto is flexibly deformed.

[Explanation of symbols]

1 ... Ski shoe mounting device 2 ... Shoe fixing plates 3, 4
... Plate front and rear parts 5, 6 ... Mounting parts 7 ... Internal space
8 ... Partition wall 9, 13 ... Base 10, 14 ... Set screw
11 ... Slider 12 ... Rotating shafts 15 and 16 ... Upper and lower walls 1
7, 20, 21, 27 ... Screw insertion holes 18, 19, 30
... Screw mounting holes 22, 23 ... Left and right walls 24 ... Rotating shaft insertion hole 25 ... Arm insertion hole 28 ... Arm insertion assembly hole 29,
32 ... Rotating shaft mounting hole 31 ... Arm part 33 ... Rotating shaft moving hole 34 ... Ski 35, 36 ... Fastener 37 ... Ski boots

Claims (3)

[Claims] 1. An intervening device between a ski boot and a ski,
Attaching a ski boot to a ski, a ski fixing plate is attached to one of the front and rear parts of a shoe fixing plate, which has a rotating shaft used to connect the ski to the ski. And a connecting member, wherein at least a side portion of the shoe fixing plate to which the connecting mechanism is attached is formed into a tubular shape to form an internal space surrounded by upper, lower, left and right walls. A sliding element provided with a rotation axis at a right angle to the longitudinal direction of the ski is stored in the internal space of the connecting side so that it can contact the upper, lower, left, and right inner surfaces, and a base is interposed between the connecting side and the ski. An arm part through which the pivot of the slider is inserted is provided on the base so that the pivot is shared, and a space is provided in the front and rear of the arm to allow the base to move back and forth with respect to the shoe fixing plate and swing. It is provided that the base can be fixed to the ski using a connecting member. Ski shoes mounting apparatus and butterflies. 2. An inner space of the connecting side portion of the shoe fixing plate is divided into a plurality of partitions by providing a partition wall extending in the longitudinal direction of the shoe fixing plate, and a slip that shares a rotating shaft in each of the divided inner spaces. Each of the children is housed in the partition wall, and the rotary shaft of the slider can be inserted into the partition wall, and a rotary shaft moving hole that allows the rotary shaft to move forward or backward within a certain range is formed. The ski shoe mounting device according to claim 1. 3. The shoe fixing plate is provided with a slider insertion opening communicating with the internal space on the end surface of the connecting side portion, and the rotating shaft is inserted into the rotating shaft mounting hole of the slider on the side surface of the connecting side portion. A hole for inserting the rotation shaft is provided, and an arm insertion hole for inserting the arm part of the base is provided on the bottom surface of the connecting side part, and further, the arm part is inserted in the slide and provided in the arm part. The ski boot mounting device according to claim 1 or 2, wherein an arm insertion hole for inserting the rotation shaft is provided in the hole.