JP6597335B2 - Wind instrument - Google Patents

Description

  The present invention relates to a wind instrument including a key mechanism.

  The woodwind instrument is configured to generate a sound of a desired sound hole by selectively opening and closing a plurality of sound holes formed in the tube body by a tampo mechanism operated by a key mechanism. (For example, patent document 1). FIG. 4 of Patent Document 1 shows a key mechanism of a conventional woodwind instrument. Here, the key mechanism 3 is composed of a connecting pipe 7 that is pivotally supported by a column 6 erected on the outer periphery of the pipe body 1, and a tampo mechanism 4 that is attached to the connecting pipe 7 via an arm 8. Yes.

JP2004-279585

  Conventionally, in the step of attaching the arm to the connecting pipe, for example, a method is used in which the position of the connecting pipe and the arm is determined by a jig, fixed, and joined by brazing. However, since the connecting pipe and the arm are thermally expanded at the time of brazing, there is a case where the position is shifted from the positioning position after joining.

  The present application has been proposed in view of the above problems, and an object thereof is to provide a wind instrument in which a support member is attached to a key shaft with high positional accuracy.

  (1) A musical instrument according to the present application includes a tubular body, a cylindrical or columnar key shaft arranged in parallel with the tubular body, a support member that fixes an opening / closing member that opens and closes a hole of the tubular body to the key shaft, The key shaft includes a first restricting portion that defines a position of the support member in the circumferential direction of the key shaft, and a second restricting portion that defines a position of the support member in the axial direction of the key shaft. The support member engages with the first restricting portion at the time of positioning, engages with the third restricting portion that restricts the relative movement in the circumferential direction, and engages with the second restricting portion to perform the relative movement in the axial direction. And a fourth restricting portion for restricting.

  The key shaft and the support member are fixed by, for example, brazing. Even if the key shaft and the support member are thermally expanded in the brazing process by engaging the first restricting portion and the third restricting portion and engaging the second restricting portion and the fourth restricting portion, the key shaft Since the relative movement in the circumferential direction and the axial direction between the support member and the support member is suppressed, it is possible to provide a wind instrument in which the support member is attached to the key shaft with high positional accuracy. The first restricting portion and the second restricting portion may have, for example, a shape protruding outward or a recessed shape with respect to the circumferential surface of the key shaft, and in particular, the configurations of (2) and (3). good.

  (2) The first restricting portion and the second restricting portion are formed by cutting out the outer periphery of the key shaft, the first restricting portion has a first plane portion parallel to the axial direction, and the second restricting portion is At both ends in the axial direction of the first flat surface portion, the first planar portion has a pair of first cross-sectional portions orthogonal to the axial direction, and the support member surrounds the key shaft by being connected to each other, and is externally fitted to the key shaft. The first member has a first member and a second member, the first member has one of a concave portion and a convex portion at the open end, and the second member is engaged with one of the concave portion and the convex portion at the open end. One of the concave portion and the convex portion to be stopped is provided, and the third restricting portion is formed on the inner surface of one of the first member and the second member, and has a second flat portion that contacts the first flat portion. The fourth restricting portion is formed on one of the first member and the second member, and has a pair of first end faces that abut against the pair of first cross-section portions. 1 the width of the fourth restricting portion which is defined by the end face, characterized in that it is equivalent to the axial distance of the first cross section of the pair.

  The first plane portion and the second plane portion are in contact with each other, and the relative movement in the circumferential direction is suppressed. The first cross section and the first end surface are in contact with each other, and the relative movement in the axial direction is suppressed. In the step of attaching the support member to the key shaft, first, either one of the first member and the second member having the second flat surface portion is attached to the key shaft, and then either one of the first member and the second member. Is preferably slid from the axial direction and connected to either the first member or the second member. In a state where either one of the first member and the second member is attached to the key shaft, there is a risk of shifting in the radial direction in the brazing process, but by connecting either one of the first member or the second member Since the first member and the second member are fitted on the key shaft, the support member can be reliably fixed. In the brazing step, relative movement in the circumferential direction and the axial direction between the key shaft and the support member is suppressed, so that a wind instrument in which the support member is attached to the key shaft with high positional accuracy can be provided.

  (3) The first restricting portion and the second restricting portion are formed by cutting out the outer periphery of the key shaft, and each of the first restricting portions is parallel to the axial direction and is a pair of third planes facing each other. The second restricting portion is located at both axial end portions of each of the pair of third plane portions and has two pairs of the second cross section perpendicular to the axial direction. Has a recess that fits into the key shaft and is opened in the radial direction of the key shaft, and the third restricting portion is formed on the inner surface of the recess and is a pair of first flat portions that abut against the pair of third flat portions. It has four plane portions, and the fourth restricting portion is formed in a recess, has two pairs of a pair of second end surfaces that come into contact with a pair of second cross-sectional portions, and is partitioned by a pair of second end surfaces. The width of the fourth restricting portion is equal to the distance in the axial direction of the pair of second cross-sectional portions in contact with each other.

  The third plane portion and the fourth plane portion come into contact with each other, and the relative movement in the circumferential direction is suppressed. The second cross section and the second end surface are in contact with each other, and the relative movement in the axial direction is suppressed. Since the pair of third plane portions oppose each other, relative movement in the circumferential direction is reliably suppressed. Since the relative movement in the circumferential direction and the axial direction between the key shaft and the support member is suppressed in the brazing process, it is possible to provide a wind instrument in which the support member is attached to the key shaft with high positional accuracy.

  According to the wind instrument according to the present application, it is possible to provide a wind instrument in which the support member is attached to the key shaft with high positional accuracy.

The structure of the key mechanism of the flute concerning 1st Embodiment is shown, (a) is a front view, (b) is a side view shown partially cut | excluding except a support | pillar and a metal core. It is the front view and AA sectional view of a communicating pipe concerning a 1st embodiment. It is a side view of the 1st arm concerning a 1st embodiment. It is a side view of the 2nd arm concerning a 1st embodiment. It is the side view which attached the 1st arm to the communicating pipe. It is the side view which attached the 2nd arm to the communicating pipe to which the 1st arm was attached. It is the front view and BB sectional drawing of a communicating pipe concerning a 2nd embodiment. It is a side view of the arm concerning a 2nd embodiment. It is the side view which attached the arm to the communicating pipe which concerns on 2nd Embodiment. It is the front view and CC sectional view of a communicating pipe concerning a 3rd embodiment. It is a side view of the arm which concerns on 3rd Embodiment. It is the side view which attached the arm to the communicating pipe which concerns on 3rd Embodiment.

  As shown in FIG. 1, the flute 1 according to the first embodiment includes a pipe body 2 and a key mechanism 10. Hereinafter, the surface having the key mechanism 10 of the flute 1 will be described as the front surface, the axial direction of the tube body 2 as the X direction, and the radial direction as the Y direction. The tube body 2 has a cylindrical shape, and a plurality of openings 3 are formed on the outer peripheral surface side by side in the X direction. The opening 3 is partitioned by a branch pipe 4 formed on the outer periphery of a hole formed in the pipe body 2. The branch pipe 4 is cylindrical and has a predetermined height in the Y direction. The inside of the branch pipe 4 is the opening 3, and the opening 3 and the branch pipe 4 are collectively referred to as a sound hole 5. The key mechanism 10 is a mechanism for opening and closing the opening 3 and is formed on the outer peripheral surface of the tube body 2.

  The key mechanism 10 includes a tampo mechanism 20 and a communication pipe part 30. The tampon mechanism 20 includes a tampon plate 21, a tampo 22, an arm 23, and the like. The tampo dish 21 and the arm 23 are made of metal, and the tampo dish 21 is fixed to the communication pipe portion 30 via the arm 23. The tampo 22 is made of, for example, leather, and is fixed to the tampo plate 21 with screws (not shown), for example.

  The connecting pipe part 30 has a support column 31, a connecting pipe 32, a cored bar 33 and the like. The support column 31 supports the cored bar 33 and is fixed to the tube body 2. The communication pipe 32 is cylindrical and accommodates a rod-shaped cored bar 33 inside. Thereby, the communication pipe 32 is rotatable with respect to the cored bar 33. The end of the arm 23 on the side of the connecting pipe 32 is formed in a cylindrical shape, and the connecting pipe 32 is fixed inside the cylindrical shape. Thereby, the tampo mechanism 20 fixed to the communication pipe 32 can also rotate in conjunction with the communication pipe 32.

  The tampo mechanism 20 is biased in the opening direction or the closing direction by, for example, a spring (not shown). The performer can operate the tampo mechanism 20 and open and close each opening 3 via the tampo 22 to produce a sound having a desired pitch.

  Next, the communication pipe 32 and the arm 23 will be described in detail. The communicating pipe 32 shown in FIG. 2 has a positioning part 320 formed by cutting out a part of the outer peripheral surface. The positioning portion 320 has a flat surface portion 32a and cross-sectional portions 32b and 32b. The plane part 32a is parallel to the X direction. The cross-sectional portions 32b and 32b are at both ends in the X direction of the plane portion 32a and are orthogonal to the X direction. The positioning part 320 is formed at a position where the arm 23 is attached, and the width W1 in the X direction of the positioning part 320 defined by the cross section 32b is the same as the width in the X direction of the arm 23 (FIG. 1).

  The arm 23 includes a first arm 231 shown in FIG. 3 and a second arm 232 shown in FIG. The first arm 231 and the second arm 232 can be connected to surround the communication pipe 32. As shown in FIG. 1, the first arm 231 has end faces 231c and 231c in the X direction. The distance between the end faces 231c and 231c is the width of the arm 23 in the X direction. Returning to FIG. 3, one end of the first arm 231 is fixed to the communication pipe 32, and the tampon plate 21 is attached to the other end (not shown in FIG. 3). One end of the first arm 231 is formed in a U-shape that surrounds the substantially half circumference of the communication pipe 32 in a side view and opens in the Y direction. The inner side of the first arm 231 is formed in a curved shape so as to contact the outer peripheral surface of the communication pipe 32 except for the flat portion 231a. The flat portion 231a is formed so as to contact the flat portion 32a of the communication pipe 32. A recess 231 b for connecting the second arm 232 is formed at the open end of the first arm 231. Specifically, the recess 231b is formed in a dovetail shape whose width becomes narrower in the opening direction. The open width of the first arm 231 is the same as the diameter of the communication pipe 32. Accordingly, the first arm 231 can be fitted into the communication pipe 32 from the Y direction. A convex portion 232 a that engages with the concave portion 231 b of the first arm 231 is formed at the open end of the arc-shaped second arm 232.

  Next, a method for attaching the first arm 231 and the second arm 232 to the communication pipe 32 will be described with reference to FIGS. First, the flat portion 32a of the communication pipe 32 and the flat portion 231a of the first arm 231 are aligned, and the first arm 231 is fitted into the communication pipe 32 from the Y direction and positioned (FIG. 5). At this time, since the width W1 (FIG. 2) in the X direction of the positioning portion 320 of the communication pipe 32 is the same as the width W1 (FIG. 1) of the first arm 231, the cross section 32b (FIG. 2) and the end surface 231c ( 1) and the position in the X direction is determined. Further, the planar portion 23a and the planar portion 231a come into contact with each other, and the circumferential position of the communication pipe 32 is determined. Next, the second arm 232 is slid from the X direction, and the second arm 232 is fitted to the first arm 231 positioned in the communication pipe 32 (FIG. 6). In this state, the concave portion 231b and the convex portion 232a are fitted together, and the first arm 231 and the second arm 232 are fitted on the outer periphery of the communication pipe 32. The position of the arm 232 is fixed. Next, the first arm 231 and the second arm 232 are joined to the communication pipe 32 by brazing.

  Here, the communication pipe 32 is an example of a key shaft, and the arm 23 is an example of a support member. The plane part 32a is an example of a first restricting part and a first plane part. The cross sections 32b and 32b are an example of a second restricting portion and a pair of first cross sections. The first arm 231 is an example of a first member, and the second arm 232 is an example of a second member. The plane portion 231a is an example of a second plane portion, and the end surfaces 231c and 231c are an example of a pair of end surfaces.

According to the first embodiment described above, the following effects are obtained.
The first arm 231 is formed with a flat surface portion 231a that contacts the flat surface portion 32a of the communication pipe 32 and an end surface 231c that contacts the cross-sectional portion 32b. Thereby, the arm 23 can be positioned in the circumferential direction and the X direction of the communication pipe 32 without using a jig for positioning. The flat portion 32a and the flat portion 231a come into contact with each other, and the relative movement between the communicating tube 32 and the arm 23 in the circumferential direction of the communicating tube 32 is suppressed. The cross section 32b and the end surface 231c come into contact with each other, and the relative movement between the communication pipe 32 and the arm 23 in the X direction of the communication pipe 32 is suppressed. Further, in a state where the first arm 231 is attached to the communication pipe 32, the first arm 231 may be shifted in the Y direction. By connecting the second arm 232 to the first arm 231, the first arm 231 and the second arm 232 are externally fitted to the communication pipe 32, so that the second arm 232 can be reliably fixed to the attachment position. Even if the communicating pipe 32 and the arm 23 are thermally expanded in the brazing step, the relative movement in the circumferential direction and the X direction between the communicating pipe 32 and the arm 23 is suppressed. An attached flute 1 can be provided.

  For example, in addition to the above-described method for attaching the support member, for example, the arm 23, to the key shaft, for example, the communicating tube 32, there is a method in which the key shaft is knurled and the support member is press-fitted. However, there is a problem that a positioning jig is required even if knurling is performed. Furthermore, when there are three or more support members, there is a problem that it becomes difficult to attach the central part when knurling. According to the method of the present application exemplified in the first embodiment and the like, since there is a positioning portion on the key shaft, positioning can be performed without using a jig, and even when three or more support members are fixed, Positioning can be performed easily. There is also a method of performing brazing after temporarily fixing the support member to the connecting pipe by spot welding. However, even with this method, a positioning jig is necessary. According to the method of the present application, the support member can be attached to the key shaft with high positional accuracy.

  Next, the communication pipe 41 and the arm 42 according to the second embodiment, which are modifications of the communication pipe 32 and the arm 23 according to the first embodiment, will be described with reference to FIGS. Since the configuration of the key mechanism 10 other than the communication pipe 41 and the arm 42 is the same as that of the first embodiment, the description thereof is omitted.

  The communication pipe 41 shown in FIG. 7 has a positioning portion 410 formed by cutting out a part of the outer peripheral surface. The positioning portion 410 has a pair of plane portions 41a and 41a and two pairs of cross-sectional portions 41b and 41b. The flat portions 41a and 41a are parallel to the X direction. The flat portions 41a and 41a are opposed to each other with the central axis of the communication pipe 41 therebetween, and are formed to be parallel to each other. The cross-sectional portions 41b and 41b are at both ends in the X direction of the flat surface portion 41a and are orthogonal to the X direction. The positioning portion 410 is formed at a position where the arm 42 is attached, and the width W2 in the X direction of the flat surface portion 41a is the same as the width in the X direction of the arm 42.

  At one end of the arm 42 shown in FIG. 8, a recess 420 that can surround the communication pipe 41 and is opened in the Y direction is formed. The recess 420 has an end face in the X direction, like the first arm 231. The distance between the end surfaces of the recess 420 is the width of the recess 420 in the X direction. A curved surface 42b is formed on the inner side of the recessed portion 420 to contact the outer peripheral surface of the communication pipe 41 except for the flat portion 42a. The flat portion 42 a is formed so as to contact the flat portion 41 a of the communication pipe 41. Here, the distance between the two flat portions 42 a is slightly shorter than the distance between the two flat portions 41 a of the communication pipe 41. Thereby, the arm 42 can be press-fitted into the communication pipe 41 and caulked.

  The arm 42 is attached to the communication pipe 41 by first press-fitting the arm 42 into the communication pipe 41 from the Y direction (FIG. 9) and caulking. In this state, the flat surface portion 41a and the flat surface portion 42a are in contact with each other, and the cross-sectional portion 41b and the end surface in the X direction of the arm 42 are in contact with each other, so that displacement due to thermal expansion is suppressed by brazing. Then, it fixes by brazing.

  Here, the plane portions 41a and 41a are an example of a first restriction portion and a pair of third plane portions, and the cross-section portions 41b and 41b are an example of a second restriction portion and a pair of second cross-section portions. Moreover, the plane parts 42a and 42a are an example of a 3rd control part and a 4th plane part. Moreover, the end surface of the arm 42 in the X direction is an example of a fourth restricting portion.

According to the second embodiment described above, the following effects are obtained.
The arm 42 is formed with a flat surface portion 42 a that contacts the flat surface portion 41 a of the communication pipe 41 and an end surface that contacts the cross-sectional portion 41 b. Thereby, the arm 42 can be positioned in the circumferential direction of the communicating pipe 41 and the X direction without using a positioning jig. The flat portion 41a and the flat portion 42a come into contact with each other, and the relative movement between the communicating tube 41 and the arm 42 in the circumferential direction of the communicating tube 41 is suppressed. The pair of cross-sectional portions 41b and the end face in the X direction of the communicating pipe 41 of the arm 42 come into contact with each other, and the relative movement between the communicating pipe 41 and the arm 42 in the X direction is suppressed. Since the pair of flat portions 41a face each other and are formed in parallel with each other, relative movement in the circumferential direction is reliably suppressed. Even if the connecting pipe 41 and the arm 42 are thermally expanded in the brazing process, the relative movement in the circumferential direction and the X direction between the connecting pipe 41 and the arm 42 is suppressed. An attached flute 1 can be provided.

  Next, the communicating pipe 51 and the arm 52 according to the third embodiment, which are modifications of the communicating pipe 41 and the arm 42 according to the second embodiment, will be described with reference to FIGS. Since the configuration of the key mechanism 10 other than the communication pipe 51 and the arm 52 is the same as that of the first embodiment, the description thereof is omitted.

  The communicating pipe 51 shown in FIG. 10 has a positioning portion 510 formed by cutting out a part of the outer peripheral surface. The positioning portion 510 has a pair of flat portions 51a and 51a, two pairs of cross-sectional portions 51b and 51b, and a circumferential surface 51c. The flat portions 51a and 51a are parallel to the X direction. The flat portions 51 a and 51 a are formed to face each other with the central axis of the communication pipe 51 interposed therebetween. The cross-sectional parts 51b and 51b are at both ends in the X direction of the flat part 51a and are orthogonal to the X direction. The circumferential surface 51c is coaxial with the communication pipe 51 and is formed without a step difference from the flat portion 51a. The positioning portion 510 is formed at a position where the arm 52 is attached, and the width W3 in the X direction of the flat portion 51a is the same as the width of the arm 52 in the X direction.

  The arm 52 shown in FIG. 11 has a recess 520 that can surround the communication pipe 51 and is open in the Y direction. The recess 520 has an end face in the X direction, like the first arm 231. The distance between the end surfaces of the recess 520 is the width of the recess 520 in the X direction. A flat portion 52a and a circumferential surface 52b are formed inside the recess 520. The flat portion 52 a is formed corresponding to the flat portion 51 a of the communication pipe 51. Further, the circumferential surface 52 b is formed so as to contact the circumferential surface 51 c of the communication pipe 51. That is, the circumferential surface 52 b is a circumferential surface coaxial with the communication pipe 51. Thereby, when the arm 52 is turned, the center axis of the communication pipe 51 can be cut as the center axis, so that the arm 52 can be easily machined. The distance between the two flat portions 52 a is formed slightly shorter than the distance between the two flat portions 51 a of the communication pipe 51. Thereby, the communication pipe 51 can be press-fitted into the arm 42 and caulked. The arm 52 is attached to the communication pipe 51 by first press-fitting the communication pipe 51 into the arm 52 (FIG. 12) and caulking. In this state, the flat portion 51a and the flat portion 52a are in contact with each other, and the cross-sectional portion 51b and the end surface in the X direction of the arm 52 are in contact with each other, so that displacement due to thermal expansion is suppressed by brazing. Then, it fixes by brazing.

  Here, the plane portions 51a and 51a are an example of a first restriction portion and a pair of third plane portions, and the cross-section portions 51b and 51b are an example of a second restriction portion and a pair of second cross-section portions. Moreover, the plane parts 52a and 52a are an example of a 3rd control part and a 4th plane part. Moreover, the end surface of the arm 42 in the X direction is an example of a fourth restricting portion.

According to the third embodiment described above, the following effects can be obtained as in the second embodiment.
The arm 52 is formed with a flat surface portion 52a that contacts the flat surface portion 51a of the communication pipe 51 and an end surface that contacts the cross-sectional portion 51b. Accordingly, the arm 52 can be positioned in the circumferential direction and the X direction of the communication pipe 51 without using a positioning jig. Even if the connecting pipe 41 and the arm 42 are thermally expanded in the brazing process, relative movement in the circumferential direction and the axial direction between the connecting pipe 51 and the arm 52 is suppressed. Flute 1 with 52 attached can be provided.

Needless to say, the present invention is not limited to the above-described embodiment, and various improvements and modifications can be made without departing from the spirit of the present invention.
In the above, the cylindrical communication pipe 32 is exemplified as the key shaft, but is not limited thereto. The key shaft may have a rod-like shape having recesses in the axial centers at both ends. Specifically, two core pressing members having convex portions that engage with the concave portions are provided, and both ends of the rod-shaped key shaft are supported by the core pressing members and rotate.

  In the above description, the first arm 231 has the concave portion 231b and the second arm 232 has the convex portion 232a. However, the first arm 231 has the convex portion, and the second arm 232 has the convex portion 232a. It is good also as a structure which has a recessed part. Moreover, although it demonstrated that the flat part 231a was formed in the 1st arm 231 to which the tampo dish 21 is fixed, in order to suppress the position shift by positioning and thermal expansion to the 2nd arm 232 to which the tampo dish 21 is not fixed. It is good also as a structure which provides a plane part.

  Moreover, although the plane part 32a was illustrated as a 1st control part above, it is not limited to a plane. A circumferential surface that is coaxial with the key shaft and has a diameter shorter than the maximum diameter of the key shaft may be used. Thereby, since the level | step difference is formed in the circumferential direction and an axial direction, the effect of positioning and suppression of a shift | offset | difference can be acquired. Moreover, it is good also as a curved surface which has a different curvature from the outer peripheral surface of a key shaft. Because the curvature is different, a step is formed in the circumferential direction and the axial direction, so that the effect of positioning and suppressing displacement can be obtained.

  In the second embodiment, the distance between the two flat portions 42a is formed slightly shorter than the distance between the two flat portions 41a of the communication pipe 41, and the arm 42 is attached to the communication pipe 41 by caulking. However, it is not limited to this. When processing can be performed with high accuracy, the distance between the two flat portions 42a may be the same as the distance between the two flat portions 41a of the communication pipe 41.

  Moreover, although the flute was illustrated as a wind instrument, besides this, it can apply to woodwind instruments, such as an oboe, a clarinet, a saxophone, a bassoon, for example. Further, for example, the present invention can be applied to a spout for discharging a liquid accumulated in a tubular body of a brass instrument such as a tuba, a trumpet, a trombone, or a horn.

1 Flute 2 Pipe body 10 Key mechanism 20 Tampo mechanism 23, 42, 52 Arms 32, 41, 51 Connecting pipes 23a, 32a, 231a, 41a, 42a, 51a, 52a Plane portion 32b, 41b, 51b Cross section 231 First arm 232 Second arm 231b, 420, 520 Concave portion 232a Convex portion 231c End face 320, 410, 510 Positioning portion

Claims (3)

A tube,
A cylindrical or columnar key shaft arranged in parallel with the tubular body;
A support member for fixing an opening / closing member for opening / closing the hole of the tubular body to the key shaft,
The key shaft is
A first restricting portion for defining a position of the support member in the circumferential direction on the key shaft;
A second restricting portion for defining a position of the support member in the axial direction on the key shaft,
The support member is
When positioning
A third restricting portion that engages with the first restricting portion to restrict relative movement in the circumferential direction;
A wind instrument comprising: a fourth restricting portion that engages with the second restricting portion to restrict relative movement in the axial direction. The first restricting portion and the second restricting portion are formed by cutting out an outer periphery of the key shaft,
The first restricting portion has a first plane portion parallel to the axial direction,
The second restricting portion has a pair of first cross sections perpendicular to the axial direction at both ends in the axial direction of the first planar portion,
The support member includes a first member and a second member that surround the key shaft by being connected to each other and are fitted on the key shaft;
The first member has one of a concave portion and a convex portion at the open end,
The second member has, at an open end, one of the concave portion and the convex portion that is engaged with either the concave portion or the convex portion,
The third restricting portion is formed on the inner surface of one of the first member and the second member, and has a second flat portion that contacts the first flat portion,
The fourth restriction portion is formed on one of the first member and the second member, and has a pair of first end surfaces that come into contact with the pair of first cross-section portions,
2. The wind instrument according to claim 1, wherein a width of the fourth restriction portion defined by the pair of first end faces is equal to a distance in the axial direction of the pair of first cross-sectional portions. . The first restricting portion and the second restricting portion are formed by cutting out an outer periphery of the key shaft,
Each of the first restricting portions includes a pair of third plane portions that are parallel to the axial direction and face each other.
The second restricting portion has two sets of a pair of second cross-sectional portions at both ends in the axial direction of each of the pair of third flat surface portions and orthogonal to the axial direction,
The support member is fitted with the key shaft, and has a recess opened in a radial direction of the key shaft,
The third restricting portion is formed on the inner surface of the concave portion, and has a pair of fourth plane portions that come into contact with the pair of third plane portions,
The fourth restricting portion is formed in the concave portion and has two sets of a pair of second end faces that come into contact with the pair of second cross-sectional portions,
2. The width of the fourth restricting portion defined by the pair of second end surfaces is equal to a distance in the axial direction of the pair of second cross-sectional portions in contact with each other. Wind instruments.

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