Crown and watch

Abstract

To provide crowns and watches that improve the quality of the female threads in screw-lock crowns, thereby improving operability and screw durability when screw-locked. [Solution] The crown comprises a crown body and a ring member. The crown body is integrally formed with a bottomed cylindrical head having a base and a cylindrical portion, and a shaft portion extending from the base and positioned inside the cylindrical portion. The ring member has threads machined on its inner surface and is positioned along the inner surface of the cylindrical portion and fixed to the crown body.

Description

Technical Field

[0001] The present invention relates to a dragon head and a clock.

Background Art

[0002] As a dragon head provided on a wristwatch, a screw-lock type dragon head that can be locked with a screw is known for preventing incorrect operation and improving waterproof performance (see, for example, Patent Document 1). The dragon head of Patent Document 1 has a head portion and a shaft portion. A concave portion is formed in the head portion, and an internal thread is formed on the inner peripheral surface of the concave portion facing the shaft portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For the screw-lock type dragon head, it is necessary to process an internal thread on the inner peripheral surface of the concave portion of the head. However, since there is a shaft portion in the concave portion and the space for a cutting tool for cutting the internal thread is small, it is difficult to form a thread by cutting. In particular, when using a difficult-to-machine material such as titanium for the dragon head, the life of the cutting tool is shortened. For this reason, the frequency of replacing the cutting tool increases, the cost increases, and the productivity also decreases. Therefore, a method of processing an internal thread using a roll tap is adopted. However, since the roll tap forms an internal thread by plastic processing, there is a problem that the quality is lower than that of an internal thread processed by cutting, and the operability during screw locking and the durability of the screw are reduced.

Means for Solving the Problems

[0005] The crown of the present disclosure comprises a crown body integrally formed with a bottomed cylindrical head having a bottom portion and a cylindrical portion, and a shaft portion extending from the bottom portion and disposed within the cylindrical portion, and a ring member having threads machined on its inner surface, wherein the ring member is arranged along the inner circumference of the cylindrical portion and fixed to the head.

[0006] The watch of this disclosure is characterized by comprising the crown. [Brief explanation of the drawing]

[0007] [Figure 1] This is a front view showing a clock according to an embodiment. [Figure 2] This is a cross-sectional view showing the main part of the clock according to the embodiment. [Figure 3] This is a cross-sectional view showing the main part of the clock according to the embodiment. [Figure 4] This is a cross-sectional view showing the crown of an embodiment. [Figure 5] This is a cross-sectional view showing the crown of an embodiment. [Modes for carrying out the invention]

[0008] [Embodiment] The clock 1 of this embodiment will be described below with reference to the drawings. As shown in Figures 1 and 2, the clock 1 includes a case 2 that houses the movement. Various types of movements conventionally used for wristwatches can be used, such as automatic winding mechanical movements that wind the mainspring with a rotor, or quartz movements. The movement drives the hour hand 21, minute hand 22, second hand 23, and date wheel 24 provided on the clock 1. Case 2 comprises a case body 3 and a case back 4. Case body 3 comprises a cylindrical body 11 and a bezel 12 provided on the surface side of the body 11. The bezel 12 is formed in a ring shape and is press-fitted into the case 11 via a packing 15. The bezel 12 may also be rotatably mounted on the case 11. The cover glass 5 is press-fitted inside the bezel 12 via a packing 16. The case back 4 consists of a ring-shaped frame 13 screwed into the case body 11, and a case back glass 14 press-fitted into the frame 13 via a gasket 17. A gasket 18 is interposed between the case body 11 and the frame 13. Note that the case back 4 may be a general case back without a case back glass 14. Furthermore, the case body 11 and the case back 4 are not limited to being separate components; they may be a one-piece case in which the case body 11 and the case back 4 are integrated.

[0009] A crown 7 is provided on the side of the case 11 of the watch 1. As shown in Figures 2 and 3, the axis direction of the crown 7 is defined as the X-axis direction, and in the X-axis direction, the direction away from the case 11 is the X1 direction, and the direction towards the case 11 is the X2 direction. As shown in Figure 2, the crown 7 can be pulled out in the X1 direction and rotated in the pulled-out position. Furthermore, as shown in Figure 3, the crown 7 of this embodiment can be locked by pushing it in the X2 direction and screwing it into the case 2 side, thereby preventing accidental operation and improving water resistance. In other words, the crown 7 is a screw-lock type crown 7.

[0010] As shown in Figures 2 and 3, a through hole is formed on the side of the body 11, and a first female screw 111 is formed in this through hole. A cylindrical winding stem pipe 60 is attached to the first female thread 111. The winding stem pipe 60 is a metal component and has a cylindrical small-diameter portion 61 and a large-diameter portion 62 with a larger diameter than the small-diameter portion 61. A first male thread 611 is formed on the outer circumferential surface of the small-diameter portion 61, and a second male thread 621 is formed on the outer circumferential surface of the large-diameter portion 62. The winding stem pipe 60 is fixed to the body 11 by screwing the first male thread 611 into the first female thread 111 of the body 11. Alternatively, the winding stem pipe 60 may be fixed to the body 11 by brazing. The stepped portion 63 between the small-diameter section 61 and the large-diameter section 62 of the winding stem pipe 60 is in contact with the outer circumferential surface of the body 11. A packing 64 is placed between the body 11 and the stepped portion 63 to provide waterproofing. A cross-shaped groove 622 is formed on the end face of the large-diameter portion 62 on the bottom 72 side, centered on the central axis of the winding stem pipe 60. The winding stem pipe 60 can be screwed into the body 11 and removed from the body 11 by inserting a predetermined jig into the groove 622 and rotating the jig.

[0011] The winding stem pipe 60 has an insertion hole 65 that penetrates the small diameter section 61 and the large diameter section 62 in the X-axis direction. The insertion hole 65 includes a guide surface 651 that guides the crown 7, a recessed groove 652 in which a packing 66 is placed, and a locking groove 653 in which a synthetic resin retaining ring 67 that prevents the packing 66 from coming out of the recessed groove 652 is locked.

[0012] The crown 7 comprises a crown body 70 and a ring member 90. As shown in Figures 4 and 5, the crown body 70 is a metal member in which a head portion 71 and a shaft portion 75 are integrally formed. The head portion 71 is formed in a bottomed cylindrical shape with a bottom portion 72 and a cylindrical portion 73. The bottom portion 72 is formed in a roughly circular shape, and a brand symbol mark or the like is displayed on its surface 721. The symbol mark may be formed by creating a raised or recessed surface on the surface 721, or a plate with the symbol mark printed on it may be attached; the method of formation can be selected as appropriate. The cylindrical portion 73 is formed in a cylindrical shape and extends from the outer peripheral edge of the bottom portion 72 in the axial direction of the crown 7. Knurling 731 is formed on the outer peripheral surface of the cylindrical portion 73. The inner peripheral surface 732 of the cylindrical portion 73 is a circular surface and a groove portion 733 is formed between it and the shaft portion 75.

[0013] The inner circumferential surface 732 comprises a large-diameter portion 735, an inclined surface 736, and a small-diameter portion 737, arranged in order from the end face 734. If the inner diameter of the large-diameter portion 735 is d1 and the inner diameter of the small-diameter portion 737 is d2, then d1 > d2. The inclined surface 736 is formed such that its inner diameter gradually decreases from the large-diameter portion 735 toward the small-diameter portion 737 and is continuous with the large-diameter portion 735 and the small-diameter portion 737. The small-diameter portion 737 is a portion where the ring member 90 is press-fitted and fixed, and is formed between the inclined surface 736 and the bottom portion 72.

[0014] The shaft portion 75 extends from the center of the bottom portion 72 and is disposed inside the cylindrical portion 73. The shaft portion 75 is inserted through the insertion hole 65. The guide surface 651 of the insertion hole 65 functions as a bearing for the shaft portion 75, and the outer peripheral surface 751 of the shaft portion 75 slides on the guide surface 651. For this reason, the bobbin 7 is movable along the axial direction of the shaft portion 75 with respect to the winding pipe 60 and is rotatable about the shaft portion 75. A bobbin insertion hole 76 is formed in the shaft portion 75. The bobbin insertion hole 76 is formed along the axial direction of the shaft portion 75, and on the opening side inserted into the inside of the body 11, as shown in FIGS. 2 and 3, a concave groove portion 761 in which the first C-ring 77 is disposed is formed. The coil spring 30 and the bobbin 40 are inserted into the bobbin insertion hole 76. A second C-ring 41 is fixed to the bobbin 40. The coil spring 30 is disposed between the second C-ring 41 and the bottom of the bobbin insertion hole 76, and biases the bobbin 7 in the X1 direction away from the body 11 with respect to the bobbin 40. As shown in FIG. 2, the first C-ring 77 attached to the shaft portion 75 abuts against the second C-ring 41, thereby restricting the movement of the bobbin 7 in the X1 direction by the coil spring 30.

[0015] The ring member 90 is a cylindrical metal member, and includes an outer peripheral surface 91, an inner peripheral surface 92, a first end surface 93 on the opening side of the cylindrical portion 73, that is, the X2 direction side, and a second end surface 94 on the bottom portion 72 side, that is, the X1 direction side. On the outer peripheral surface 91 of the ring member 90, an insertion portion 911 inserted into the cylindrical portion 73, a tightening allowance portion 912 press-fitted into the small-diameter portion 737, and a concave groove portion 913 provided between the insertion portion 911 and the tightening allowance portion 912 are formed. The tightening allowance portion 912 is continuously formed from the outer peripheral edge of the second end surface 94. That is, the tightening allowance portion 912 is provided at the end portion located on the bottom 72 side, i.e., the inner side, of the cylindrical portion 73. When the length dimension of the ring member 90 in the X-axis direction is L11 and the length dimension of the tightening allowance portion 912 is L12, the dimension L12 is set to be about 1 / 5 of the dimension L11. Also, the dimension L11 is set to be slightly smaller than the depth dimension of the groove portion 733 in the X-axis direction. [[ID=…]] When the outer diameter of the insertion portion 911 is D11 and the outer diameter of the tightening allowance portion 912 is D12, it is set such that d2 < D12 < D11 < d1. Since the outer diameters D12 and D11 of the tightening allowance portion 912 and the insertion portion 911 are smaller than the inner diameter d1 of the large-diameter portion 735, when the ring member 90 is inserted into the groove portion 733 of the head portion 71, a slight gap is secured between the insertion portion 911 and the large-diameter portion 735, and the ring member 90 can be smoothly inserted into the groove portion 733 until the tightening allowance portion 912 is press-fitted into the small-diameter portion 737. Also, since the inner diameter d2 of the small-diameter portion 737 is smaller than the outer diameter D12 of the tightening allowance portion 912, by pushing the tightening allowance portion 912 into the groove portion 733, the tightening allowance portion 912 and the small-diameter portion 737 are crimped and fixed. For this reason, the tightening allowance portion 912 is press-fitted into the groove portion 733, the ring member 90 is arranged along the inner circumference of the cylindrical portion 73, and is fixed to the head portion 71 of the dragonfly body 70. At this time, since an inclined surface 736 is formed between the large-diameter portion 735 and the small-diameter portion 737, the tightening allowance portion 912 can be smoothly press-fitted into the small-diameter portion 737 through the inclined surface 736. Furthermore, since the concave groove portion 913 is formed in the ring member 90, the inclined surface 736 can be escaped, and it is possible to prevent the ring member 90 from interfering with the inclined surface 736. Also, since it is possible to fill the adhesive into the concave groove portion 913, the ring member 90 can be fixed to the head portion 71 with the adhesive in addition to press-fitting, and the fixing strength can also be further increased.

[0016] The inner circumferential surface 92 of the ring member 90 has a large diameter portion 921, an internal thread 922, and a small diameter portion 923. The large diameter portion 921 has an internal diameter greater than or equal to the diameter of the root of the internal thread 922. The internal diameter of the large diameter portion 921 is larger than the external diameter of the second internal thread 621. Therefore, when the ring member 90, which is press-fitted and fixed to the head 71, is pushed towards the winding stem pipe 60, the large diameter portion 921 does not interfere with the second internal thread 621. Furthermore, if the lengths of the large diameter portion 921, the internal thread 922, and the small diameter portion 923 in the X-axis direction are L13, L14, and L15, then dimension L15 is longer than dimension L12. Therefore, in the X-axis direction, the formation range of the internal thread 922 and the formation range of the tightening allowance portion 912 are at different positions. The female thread 922 is formed to be screwable with the second male thread 621 of the winding pipe 60. The female thread 922 is formed continuously on the X1 direction side of the large diameter portion 921, and its length dimension L14 in the X axial direction is set to allow the female thread 922 and the second male thread 621 to be screwed together until the first end face 93 of the ring member 90 abuts against the outer circumferential surface of the body 11, as shown in Figure 3. The position where the female thread 922 is formed is on the X1 direction side of the large diameter portion 921. The small-diameter portion 923 is formed continuously with the female thread 922 on the X1 direction side and is set to be less than or equal to the inner diameter of the female thread 922. Alternatively, the female thread 922 may be formed up to the second end face 94, and the small-diameter portion 923 may not be provided. As shown in Figure 5, when the first end face 93 of the ring member 90 is positioned coplane with the end face 734, the second end face 94 is positioned slightly away from the bottom 72. Alternatively, the second end face 94 of the ring member 90 may be brought into contact with the bottom 72, so that the first end face 93 is recessed compared to the end face 734. In this embodiment, when we say that the first end face 93 of the ring member 90 and the end face 734 of the cylindrical portion 73 are arranged on the same plane, we mean that the first end face 93 and the end face 734 are substantially arranged on the same plane. That is, it is not limited to the case where the first end face 93 and the end face 734 are completely on the same plane, and there may be a slight step between the first end face 93 and the end face 734, as long as the step is not noticeable when the user looks at the opening side of the crown 7, and the user can recognize that they are on the same plane, thereby improving aesthetics.

[0017] In this embodiment, the crown 7 can be attached to the case 2 by the following procedure. First, the ring member 90 is press-fitted and fixed into the crown body 70 to assemble the crown 7. Then, the first end face 93 and end face 734 are polished to a mirror finish. This makes the boundary between the crown body 70 and the ring member 90 less noticeable, further improving the aesthetics. In addition, the winding stem pipe 60 is screwed into and fixed to the case body 11 of the case 2. Then, the coil spring 30, the tip of the winding stem 40 with the second C-ring 41 attached, and the first C-ring 77 are placed in the winding stem insertion hole 76 of the shaft portion 75, and the winding stem 40 and shaft portion 75 are inserted into the insertion hole 65 of the winding stem pipe 60, which is fitted with the packing 66 and retaining ring 67. In this way, the crown 7 can be attached to the case 2. As shown in Figure 2, the crown 7 can be rotated or pulled out by releasing the screw-in state between the female screw 922 and the second male screw 621. Also, as shown in Figure 3, the crown 7 can be locked by rotating the crown body 70 while pushing it in the X2 direction, thereby engaging the female screw 922 and the second male screw 621, preventing accidental operation and improving water resistance.

[0018] The materials of the metal winding stem pipe 60, crown body 70, and ring member 90 are not limited, but in this embodiment, they are made of the same metal material such as stainless steel or titanium. Since the ring member 90 is manufactured separately from the crown body 70, even if it is made of a difficult-to-machine material such as titanium, the female thread 922 can be formed by cutting with a cutting tool. Also, even if the winding stem pipe 60 is made of a difficult-to-machine material such as titanium, the first male thread 611 and the second male thread 621 can be formed by cutting.

[0019] [Effects of the Embodiment] According to this embodiment, the ring member 90, on which the female thread 922 is machined on the inner circumferential surface 92, is constructed separately from the crown body 70. Therefore, the female thread 922 can be machined without the shaft portion 75 being present inside the ring member 90. As a result, space can be secured inside the ring member 90, allowing for the placement of a cutting tool for machining the female thread 922. This enables the female thread 922 to be formed by machining even when the ring member 90 is made of a difficult-to-machine material such as titanium. Consequently, the quality of the female thread 922 can be improved, the operability of the crown 7 when it is screw-locked can be improved, and the durability of the female thread 922 and the second male thread 621 of the winding stem pipe 60 can also be improved.

[0020] Since the outer circumferential surface 91 of the ring member 90 is pressed and fixed in contact with the inner circumferential surface 732 of the cylindrical portion 73, there is no need to increase the thickness of the head 71, that is, the length of the head 71 in the X-axis direction. Therefore, the size of the crown 7, especially the length in the X-axis direction that protrudes from the case 2, can be kept to the same level as a conventional crown, and the aesthetic appearance of the watch 1 can be prevented from deteriorating. Furthermore, since the crown body 70 and the ring member 90 are made of the same metal material, they can be made to appear as if they were molded as a single piece, further improving aesthetics. In addition, after the ring member 90 is press-fitted and fixed, both the first end face 93 of the ring member 90 and the end face 734 of the crown body 70 are polished, making the boundary between the crown body 70 and the ring member 90 less noticeable, further improving the sense of unity and aesthetics.

[0021] Furthermore, since the tightening portion 912 is formed at the bottom end of the ring member 90, and the recessed groove portion 913 is formed adjacent to the tightening portion 912, the ring member 90 can be fixed to the crown body 70 by press-fitting, and can also be fixed by filling the recessed groove portion 913 with adhesive, thereby further improving the fixing strength of the ring member 90. In addition, since an inclined surface 736 is formed on the inner circumferential surface 732, when the ring member 90 is inserted into the groove portion 733, the tightening portion 912 is guided by the inclined surface 736, allowing it to be smoothly press-fitted into the small diameter portion 737, thereby improving the assembly workability of the crown body 70 and the ring member 90. Furthermore, when the second end face 94 of the ring member 90 is brought into contact with the bottom 72 of the crown body 70 to position it in the axial direction, the shape of the inner circumferential surface 732 of the cylindrical portion 73 can be simplified and easily manufactured compared to, for example, when a stepped portion is formed on the inner circumferential surface of the cylindrical portion 73 and the ring member 90 is positioned by bringing it into contact with this portion. In addition, since the ring member 90 can be easily and accurately positioned relative to the cylindrical portion 73, it is possible to prevent the ring member 90 from protruding from the cylindrical portion 73 and thus reducing its aesthetic appeal.

[0022] Since the formation range where the female thread 922 is formed and the formation range where the tightening allowance portion 912 is formed are different in the axial direction of the ring member 90, when the ring member 90 is press-fitted into the crown body 70, even if stress is applied to the inner circumference of the ring member 90 in the formation range of the tightening allowance portion 912, it is different from the formation range of the female thread 922, thus preventing stress from being applied to the female thread 922. Therefore, deformation of the female thread 922 during press-fitting of the ring member 90 can be prevented, and the female thread 922 can be maintained in a high-quality state.

[0023] [Differentiation] The fixing structure between the crown body and the ring member is not limited to press-fitting; the crown body and the ring member may also be fixed by brazing, adhesive, or the like. Furthermore, the relative rotation of the crown body and the ring member may be restricted by mechanical engagement by making the outer circumferential surface of the tightening portion 912 of the ring member 90 and the inner circumferential surface of the cylindrical portion 73 to which the tightening portion 912 is fixed polygonal in cross-section, or by machining a keyway.

[0024] The tightening portion 912 of the ring member 90 is not limited to being provided at the bottom end of the cylindrical portion 73, but may also be provided in the middle of the ring member 90 in the axial direction, or it may be provided along the entire axial direction of the ring member 90. In the above embodiment, since the tightening portion 912 is formed at the end of the ring member 90, the outer diameter of the tightening portion 912 can be easily measured, which has the advantage of making it easier to control dimensional accuracy. The winding stem pipe 60, the crown body 70, and the ring member 90 are not limited to being made of the same metal material, but can also be made of different metal materials. For example, the crown body 70, which is exposed to the outside in the crown 7, may be made of a metal material such as 18k gold, which has a high aesthetic appeal, while the winding stem pipe 60 and the ring member 90 may be made of a metal material such as stainless steel or titanium, which has high durability and will not deteriorate even if the screw lock operation is repeated.

[0025] [summary] The crown of the present disclosure comprises a crown body integrally formed with a bottomed cylindrical head having a bottom portion and a cylindrical portion, and a shaft portion extending from the bottom portion and disposed within the cylindrical portion, and a ring member having threads machined on its inner surface, wherein the ring member is arranged along the inner circumference of the cylindrical portion and fixed to the head. According to the crown of this disclosure, the ring member, which has internal threads machined on its inner circumference, is constructed separately from the crown body, which has a head and a shaft. As a result, the internal threads of the ring member can be formed by machining. Therefore, the quality of the threads can be improved, the operability when the threads are locked can be improved, and the durability of the threads can also be improved.

[0026] In the crown of the present disclosure, the ring member may be fixed to the inner circumferential surface of the cylindrical portion by press-fitting. According to the crown of this disclosure, the ring member is fixed to the inner circumferential surface of the cylindrical part of the crown body by press-fitting. Compared to fixing with adhesive or brazing, this improves the ease of assembly of the crown and allows the ring member to be firmly fixed to the crown body.

[0027] In the crown of the present disclosure, the outer circumferential surface of the ring member is provided with an insertion portion that is inserted into the cylindrical portion and a tightening portion that is press-fitted into the inner circumferential surface of the cylindrical portion, and it is preferable that the tightening portion is provided at the bottom end of the ring member. According to the crown of this disclosure, since the press-fit portion between the ring member and the cylindrical portion is press-fitted and fixed on the bottom side opposite to the opening side of the cylindrical portion, even if adhesive is added to the press-fit portion, the adhesive does not affect the opening side of the cylindrical portion, thus improving the fixing strength of the ring member without impairing the aesthetic appearance of the crown.

[0028] In the crown of the present disclosure, the outer circumferential surface of the ring member is provided with an insertion portion that is inserted into the cylindrical portion and a tightening portion that is press-fitted into the inner circumferential surface of the cylindrical portion, and it is preferable that the thread formed on the inner circumferential surface of the ring member is formed in a range different from the range in which the tightening portion is formed in the axial direction of the ring member. According to the crown of this disclosure, the area where the female thread is formed on the inner circumferential surface of the ring member and the area where the tightening allowance is formed are different in the axial direction of the ring member. Therefore, when the ring member is press-fitted, the stress applied to the tightening allowance can be prevented from affecting the female thread, thereby preventing a deterioration in the quality of the thread.

[0029] In the crown of the present disclosure, it is preferable that the ring member is positioned axially by the end face on the bottom side contacting the bottom. According to the crown of this disclosure, the ring member is positioned axially by bringing the bottom end face of the ring member into contact with the bottom of the crown body. Therefore, compared to, for example, a case where a stepped portion is formed on the inner circumferential surface of the cylindrical portion and the ring member is positioned by bringing it into contact with this portion, the shape of the inner circumferential surface of the cylindrical portion can be simplified and it can be easily manufactured.

[0030] In the crown of the present disclosure, it is preferable that the first end face of the ring member located on the opening side of the cylindrical portion and the end face on the opening side of the cylindrical portion are arranged on the same plane. According to the crown of this disclosure, since the end faces of the ring member and the cylindrical part are arranged on the same plane, polishing processes such as mirror finishing can be applied to each end face after press-fitting, thereby improving the sense of unity and aesthetics of the ring member and the cylindrical part.

[0031] In the crown of the present disclosure, it is preferable that the crown body and the ring member are formed from the same metal material. According to the crown of this disclosure, since the crown body and the ring member are made of the same metal material, the crown can be made to appear as if it were integrally molded, thereby improving its aesthetic appeal.

[0032] The watch of this disclosure is characterized by comprising the crown. According to the watch of this disclosure, the crown is provided, which improves operability when the screw is locked and also improves the durability of the screw. [Explanation of Symbols]

[0033] 1...watch, 7...crown, 40...winding stem, 60...winding stem pipe, 70...crown body, 71...head, 72...bottom, 73...tube, 75...shaft, 76...winding stem insertion hole, 90...ring member, 91...outer surface, 92...inner surface, 93...first end face, 94...second end face, 111...first female thread, 611...first male thread, 621...second male thread, 732...inner surface, 734...end face, 751...outer surface, 911...insertion part, 912...tightening part, 922...female thread.

Claims

1. A crown body integrally formed with a bottomed cylindrical head having a base and a cylindrical portion, and a shaft portion extending from the base and positioned within the cylindrical portion, A ring member having threads machined on its inner surface, The ring member is positioned along the inner circumference of the cylindrical portion and fixed to the head. A crown characterized by the following.

2. In the crown described in claim 1, The ring member is fixed to the inner circumferential surface of the cylindrical portion by press-fitting. A crown characterized by the following.

3. In the crown described in claim 2, The outer circumferential surface of the ring member is provided with an insertion portion that is inserted into the cylindrical portion and a clamping portion that is press-fitted into the inner circumferential surface of the cylindrical portion. The aforementioned tightening portion is provided at the bottom end of the ring member. A crown characterized by the following.

4. In the crown described in claim 2, The outer circumferential surface of the ring member is provided with an insertion portion that is inserted into the cylindrical portion and a clamping portion that is press-fitted into the inner circumferential surface of the cylindrical portion. The threads formed on the inner circumferential surface of the ring member are formed in a range different from the range in which the tightening portion is formed, in the axial direction of the ring member. A crown characterized by the following.

5. In the crown described in claim 1, The ring member is positioned axially by the bottom end face contacting the bottom. A crown characterized by the following.

6. In the crown described in claim 1, The first end face of the ring member located on the opening side of the cylindrical portion and the end face on the opening side of the cylindrical portion are arranged in the same plane. A crown characterized by the following.

7. In the crown described in claim 1, The crown body and the ring member are formed from the same metal material. A crown characterized by the following.

8. A watch comprising the crown described in claim 1.

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