Variable inner-diameter ring

Abstract

The present invention relates to a ring with a variable inner diameter, comprising: a main body portion having an annular structure forming the outer shape of the ring; a variable portion having an annular structure disposed on the inner surface of the main body portion and forming the inner diameter of the ring; a housing portion disposed on the upper part of the main body portion and having a through hole formed therein; and a decorative portion coupled to the through hole and having a decorative element disposed on the upper part, wherein the variable portion has a gap formed by disconnecting a portion of the upper part and a portion of the lower part fixedly coupled to the inner surface of the main body portion.

Description

Technology Field

[0001] The present invention relates to an inner diameter adjustable ring, and more specifically, to an inner diameter adjustable ring in which the inner diameter of the ring can be adjusted stably and easily according to the user's needs, thereby improving wearing convenience and usability. Background Technology

[0002] Conventional rings are manufactured to have a fixed inner diameter to fit the thickness of the user's finger. However, a person's finger circumference can change frequently due to various factors such as seasonal temperature changes, activity levels, swelling, and weight fluctuations, and discomfort or pressure may occur, especially when worn for a long time. Accordingly, there has been a steady demand for a structure that allows the inner diameter of the ring to be adjusted to suit the wearer's situation.

[0003] Conventionally, structures have been proposed that use a spring to allow a portion of the ring to expand or contract, structures that insert an inner diameter adjustment plate inside the ring, and slit structures that allow for opening or closing by cutting a portion of the ring.

[0004] However, these conventional technologies have a limited inner diameter adjustment range, making fine adjustment difficult. Furthermore, significant discomfort is often felt inside the ring during adjustment, or the adjustment structure protrudes, frequently reducing wearing comfort. Additionally, the structure is structurally vulnerable to repetitive operation or lacks durability, which can lead to problems such as easy wear or breakage of the connecting parts during long-term use.

[0005] Furthermore, due to the lack of stability in the adjustment structure of conventional technology, while the operation to reduce the inner diameter was relatively easy, problems frequently arose during the process of expanding the inner diameter, such as inability to move in the reverse direction or irreversible deformation of the metal elastic part. In addition, the inner diameter adjustment mechanism sometimes protruded from the inside of the ring or caused asymmetrical deformation during operation, resulting in reduced wearing comfort and compromising the aesthetic perfection of the ring's appearance.

[0006] Considering the above-mentioned problems, the present invention aims to provide an inner diameter variable ring that can precisely and stably adjust the inner diameter, has excellent durability even under repetitive operation, can flexibly respond to changes in the wearer's finger shape, and further maintains aesthetic appearance. Prior art literature

[0007] Republic of Korea Registered Patent No. 10-0906826 The problem to be solved

[0008] The objective of the present invention is to solve the aforementioned conventional problems by providing an inner diameter variable ring that allows the inner diameter of the ring to be adjusted stably and easily according to the user's needs, thereby improving wearing convenience and usability. means of solving the problem

[0009] The above objective is achieved by an inner diameter variable ring according to the present invention, comprising: a main body portion having an annular structure forming the outer shape of the ring; a variable portion having an annular structure disposed on the inner surface of the main body portion and forming the inner diameter of the ring; a housing portion disposed on the upper part of the main body portion and having a through hole formed therein; and a decorative portion coupled to the through hole and having a decorative element disposed on the upper part, wherein the variable portion is characterized in that a portion of the upper area is severed to form a gap, and a portion of the lower area is fixedly coupled to the inner surface of the main body portion.

[0010] In addition, the inner diameter variable ring further includes a sliding part in which an internal hollow is formed along the longitudinal direction and the severed ends of the variable part are respectively inserted into the left and right sides of the internal hollow. The sliding part descends by the pressure of the decorative part to move the severed ends of the variable part forward in a direction closer to each other, and when the pressure is released, it rises by the elastic restoring force of the variable part to move the severed ends of the variable part backward in a direction further apart from each other, thereby allowing the inner diameter size of the ring to be changed.

[0011] Additionally, the decorative part includes a cylindrical screw-coupling part to which a decorative element is attached at the top and a rod-shaped rod part extending from the bottom of the screw-coupling part, and the screw-coupling part is capable of screw-coupling into the through hole by having a screw thread formed on its side that corresponds to the screw thread formed on the inner circumference of the through hole, and can move up and down in the axial direction of the through hole according to the user's screw rotation.

[0012] In addition, the sliding part may be provided with a shape corresponding to the curvature of the disconnected ends of the variable part.

[0013] In addition, the variable part has hinge structures formed at the left and right ends of the lower region fixed to the main body part, respectively, so that the two ends separated by the hinge structures can rotate elastically. Effects of the invention

[0014] According to the present invention, the inner diameter of the ring can be easily and stably adjusted to fit the thickness of the user's finger.

[0015] According to the present invention, the inner diameter adjustment function is naturally integrated into the internal structure of the ring, resulting in excellent wearing comfort and the effect of maintaining the aesthetic appearance.

[0016] According to the present invention, structural durability is ensured even with repeated inner diameter adjustment, thereby enabling long-term use.

[0017] Meanwhile, the effects of the present invention are not limited to those mentioned above, and various effects may be included within the scope obvious to a person skilled in the art from the contents described below. Brief explanation of the drawing

[0018] FIG. 1 illustrates an inner diameter variable ring comprising a main body, a variable part, a housing part, and a decorative part according to one embodiment of the present invention, and FIG. 2 illustrates the appearance of the variable part of the inner diameter variable ring of FIG. 1 before and after the change in the inner diameter size. FIG. 3 illustrates the appearance of the inner diameter size of the variable part before and after change in the state where a sliding part is added to the inner diameter variable ring of FIG. 1. FIG. 4 illustrates the internal view of the sliding part before and after the change in the inner diameter size of the variable part of FIG. 3, and FIG. 5 illustrates the internal view of the housing portion before and after the change in the inner diameter size of the variable portion of FIG. 3, and FIG. 6 illustrates the ratchet coupling and release of a locking part and a variable part provided inside the sliding part of FIG. 3 by a gear structure. Figure 7 illustrates the appearance of the release portion of the locking part protruding outside the sliding part of Figure 6. Specific details for implementing the invention

[0019] Hereinafter, some embodiments of the present invention will be described in detail with reference to the exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings.

[0020] In addition, when describing embodiments of the present invention, if it is determined that a detailed description of related known configurations or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted.

[0021] In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the embodiments of the present invention. These terms are used merely to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the terms used.

[0023] From now on, with reference to the attached drawings, an inner diameter variable ring according to an embodiment of the present invention will be described in detail.

[0024] FIG. 1 illustrates an inner diameter variable ring comprising a main body, a variable part, a housing part, and a decorative part according to an embodiment of the present invention; FIG. 2 illustrates the inner diameter size of the variable part of FIG. 1 before and after the change in the inner diameter size of FIG. 1; FIG. 3 illustrates the inner diameter size of the variable part before and after the change in the inner diameter size of FIG. 1 with a sliding part added to FIG. 1; FIG. 4 illustrates the inner view of the sliding part before and after the change in the inner diameter size of FIG. 3; FIG. 5 illustrates the inner view of the housing part before and after the change in the inner diameter size of FIG. 3; FIG. 6 illustrates the ratchet coupling and release of the variable part and the locking part provided inside FIG. 3 by a gear structure; FIG. 7 illustrates the release part of the locking part protruding outside the sliding part of FIG. 6.

[0025] As illustrated in FIGS. 1 to 6, an inner diameter variable ring (100) according to one embodiment of the present invention may include a main body part (110), a variable part (120), a sliding part (130), a housing part (140), a decorative part (150) and / or a locking part (160).

[0026] First, the main body (110) is a member that forms the outer shape of a ring (100) having an inner diameter of a certain size, and a variable part (120) described later can be coupled to the inside.

[0027] The main body (110) is formed in an annular (ring) structure and serves as a support structure that secures the rigidity and shape stability of the entire ring (100).

[0028] The main body (110) can be made of a metal or metal alloy with excellent durability and machinability, such as gold, silver, titanium, or stainless steel.

[0029] A variable part (120), which will be described later, may be disposed on the inner surface of the main body (110), and a portion of the variable part (120) may be fixedly coupled to the main body (110). Additionally, a housing part (140) having a rectangular or polygonal cross-section may be formed in the upper area of ​​the main body (110).

[0030] According to the above-described main body (110), by providing a stable support base for the variable part (120) and the housing part (140) for the inner diameter variable function of the ring (100), the structural stability and durability of the entire ring (100) can be secured even during repetitive inner diameter adjustment operations.

[0031] Next, the variable part (120) is a member that forms the inner diameter of the ring (100) and can be disposed on the inner surface of the main body part (110) described above.

[0032] The variable part (120) can be provided in an annular structure like the main body part (110) described above, and in the basic state, the outer surface can be arranged in a manner that contacts the inner surface of the main body part (110).

[0033] The variable part (120) may be provided with an elastic material capable of elastic deformation to facilitate changes in the inner diameter of the ring (100). For example, stainless steel spring alloy, titanium alloy, nickel-titanium (Ni-Ti) series shape memory alloy, or flexible synthetic resin material may be used. Through these materials, the variable part (120) can be elastically restored to its original curvature shape when deformed toward the center of the ring (100) by an external force and then returned to its original position.

[0034] A portion of the variable part (120) may be fixedly coupled to the main body part (110) to prevent rotation or detachment. Specifically, a portion corresponding to less than 1 / 4 of the circumference of the variable part (120), centered on the lowest point (6 o'clock direction) of the variable part (120), may be fixedly coupled to the main body part (110). The remaining portion other than the fixed portion is set as a variable area that can be freely deformed when the inner diameter changes, thereby providing sufficient deformation margin for the variable part (120) to move and deform in the direction of the ring (100).

[0035] The fixed area of ​​the variable part (120) and the main body part (110) can be combined in various ways. For example, the fixed section of the variable part (120) can be firmly connected to the inner surface of the main body part (110) by at least one of welding, soldering, laser brazing, mechanical fitting, interlocking, adhesive bonding, or integral molding, and through this connection structure, the variable part (120) can be prevented from rotating or detaching during the process of changing the inner diameter.

[0036] The upper region (12 o'clock direction) of the variable part (120) may be provided in a disconnected form. That is, the variable part (120) may be provided in an overall “C” shape. That is, the upper region of the variable part (120) may be provided in a disconnected form so that a gap is formed, and the disconnected ends may be inserted and moved to both sides of the internal space of the sliding part (130) described later. At this time, the spacing of the disconnected part may be set within a range of 5% to 20% of the total circumference length of the variable part (120), and this is intended to allow the disconnected ends to approach each other and form a natural change in curvature when the inner diameter is reduced.

[0037] Meanwhile, in addition to the simple fixed method described above, the variable part (120) can be implemented in a form where both ends of the disconnected part of the variable part (120) are rotatably connected through a hinge structure while the lower end of the variable part (120) is combined with the main body part (110).

[0038] Specifically, the lower center area (e.g., 6 o'clock direction) of the variable part (120) may be fixedly connected to the inner surface of the main body part (110) by welding, brazing, integral molding, or a mechanical fitting structure, or may be integrally molded with the main body part (110), and hinge structures may be provided at the left and right ends of the lower fixed section, that is, at the two end areas where the disconnected part of the variable part (120) is connected. Accordingly, the lower center area of ​​the variable part (120) remains fixed integrally with the main body part (110), and the disconnected two ends can rotate at a predetermined angle or elastically bend through the hinges, and a deformation mechanism may be formed in which the two ends of the disconnected part naturally rotate inward toward the center of the ring (100) when the sliding part (130) descends, thereby reducing the inner diameter.

[0039] According to this hinge-type structure, only the elastic cutting part of the variable part (120) can be separated and replaced with a new cutting part, allowing for simple part replacement in case of damage, and by replacing the cutting part with a member of various materials or various colors and patterns, the user can easily change the wearing characteristics or visual atmosphere of the ring (100).

[0040] According to the variable part (120) described above, it has the effect of stably accommodating the deformation required when adjusting the inner diameter, thereby maintaining the wearing comfort of the ring (100) while ensuring high durability and resilience against repeated changes in inner diameter.

[0041] Next, the sliding part (130) is a member that induces deformation of the variable part (120) through vertical movement, and the severed ends of the variable part (120) described above can be inserted in both directions of the internal hollow.

[0042] The sliding part (130) can be provided in a block shape overall, and a hollow is formed inside to form a movement path for moving the disconnected ends of the variable part (120) described above.

[0043] The sliding part (130) and the internal hollow can be formed with a curved shape corresponding to the curvature of the disconnected part of the variable part (120). Accordingly, when the disconnected ends of the variable part (120) move along the inside of the sliding part (130), contact resistance is minimized, and natural guided movement according to the change in curvature of the disconnected part can be enabled. Additionally, the outer surface of the sliding part (130) can also be formed with a curved surface corresponding to the curvature of the inner surface of the ring (100), thereby reducing the sense of incongruity with the inner surface that contacts the finger when worn, and ensuring that the wearing comfort is not degraded even when an operation for adjusting the inner diameter is performed.

[0044] The sliding part (130) can be positioned inside the lower part of the through hole formed in the housing part (140) described later in the basic state, and when the decorative part (150) described later pushes the upper surface of the sliding part (130) downward, the sliding part (130) can move stably downward along the through hole. At this time, a mounting groove corresponding to the shape of the rod part (152) of the decorative part (150) can be formed on the upper surface of the sliding part (130), and accordingly, even if left and right eccentric forces occur during the process of the decorative part (150) pressing the sliding part (130), the sliding part (130) can move precisely in the vertical direction without twisting.

[0045] According to the sliding part (130) described above, the vertical driving force of the decorative part (150) is stably transmitted to slide the disconnected ends of the variable part (120), thereby enabling the inner diameter of the ring (100) to be easily and precisely adjusted.

[0046] Next, the housing part (140) is a member to which the decorative part (150) described later is screw-coupled, and can be provided in the upper region of the main body part (110) described above.

[0047] The housing part (140) may be provided with a protruding shape having a cross-section such as a rectangle, trapezoid, polygon, or arc, and may be formed integrally with the main body part (110) or a separate member may be fixed to the top of the main body part (110) through welding, brazing, fitting, etc.

[0048] A through hole penetrating from top to bottom may be formed inside the housing part (140), and a sliding part (130) may be positioned in the lower space of the through hole in its basic state. Accordingly, the longitudinal width of the sliding part (130) is made smaller than the diameter of the through hole.

[0049] Additionally, screw threads may be formed on the inner surface of the through hole of the housing part (140). Accordingly, the decorative part (150) described later can be screw-coupled to the through hole, and the sliding part (130) in contact with the bottom can be moved up and down by moving up and down through screw rotation.

[0050] According to the housing part (140) described above, the sliding part (130) and the decorative part (150) are stably accommodated and guided, thereby ensuring precision and repeatability of the inner diameter adjustment operation, and at the same time, the ring (100) structure can be realized in a natural and aesthetic appearance.

[0051] Next, the decorative part (150) is a member that moves the sliding part (130) up and down to adjust the size of the inner diameter of the variable part (120), and can be screw-coupled to the through hole of the housing part (140) described above. More specifically, the decorative part (150) may include a screw-coupled part (151) and / or a rod part (152).

[0052] The screw coupling part (151) may be provided in a shape corresponding to the through hole, for example, in the shape of a cylinder. On the side of the screw coupling part (151), a screw thread corresponding to the screw thread formed inside the through hole of the housing part (140) may be formed, and accordingly, when the user rotates the decorative part (150), the decorative part (150) may rise or fall along the axial direction of the through hole. In addition, a decorative object such as a jewel or stone may be attached to the upper part of the screw coupling part (151).

[0053] A rod portion (152) may be extended and formed at the lower center of the screw coupling portion (151). The lower surface of the rod portion (152) may be provided with a shape corresponding to the upper guide groove of the sliding portion (130), thereby suppressing eccentric force that may occur during rotation and allowing the sliding portion (130) to move stably in the vertical direction.

[0054] The decorative part (150) can be formed from a material with excellent wear resistance and strength, such as metal, alloy, ceramic, or corrosion-resistant synthetic resin, and an appropriate surface treatment or coating can be applied to minimize deformation or wear even with repetitive rotational motion.

[0055] The decorative part (150) moves up and down along the through hole of the housing part (140) according to the rotation operation of the user, and the sliding part (130) also moves up and down according to the lifting movement of the decorative part (150) by the lower surface of the decorative part (150) coming into contact with the upper guide groove of the sliding part (130).

[0056] Specifically, when the decorative part (150) moves downward, the sliding part (130) also moves downward accordingly, and as the severed ends of the variable part (120) inserted into the internal hollow of the sliding part (130) are pulled inward according to the downward displacement of the sliding part (130), the entire variable part (120) can be elastically deformed toward the center of the ring (100). During this deformation process, the gap between the upper severed parts of the variable part (120) is gradually reduced, causing the inner diameter of the variable part (120) to decrease, thereby allowing the entire inner diameter of the ring (100) to be precisely adjusted to the size desired by the user.

[0057] Conversely, when the user rotates the decorative part (150) in the opposite direction so that the decorative part (150) rises, the variable part (120) and the sliding part (130) move upward due to the elastic restoring force of the variable part (120). Accordingly, the inner diameter of the ring (100) can be expanded, and repetitive inner diameter adjustment operations can be performed stably and reliably solely by the operating force of the decorative part (150).

[0058] According to the above-described decorative part (150), the deformation of the sliding part (130) and the variable part (120) is precisely controlled by a simple rotation operation by the user, so that the inner diameter of the ring (100) can be easily and stably adjusted to a desired size.

[0059] Meanwhile, the internal hollow of the sliding part (130) may include a ratchet coupling structure positioned opposite each other on both sides so that the severed ends of the variable part (120) are symmetrically introduced toward the center of the ring (100).

[0060] Specifically, in the left and right regions of the internal hollow of the sliding part (130), a locking part (160) facing each other may be provided, and the locking part (160) may be provided in a form bent downward from the main body of the sliding part (130) toward the internal hollow, and its free end may be configured to be elastically deflectable toward the movement path of the disconnected part of the variable part (120).

[0061] The area that is coupled to the inner surface of the sliding part (130) of the locking part (160) may be provided with an elastic part made of an elastic material, for example, a leaf spring, a support base linked with a coil spring, etc. The elastic part is compressed when the disconnecting part of the variable part (120) advances, and then restored to its original shape when the teeth of the disconnecting part reach a predetermined position, thereby stably maintaining the locking state. Due to this elastic support structure, the locking part (160) provides a stable restoring force even under repeated bending deformation, and can perform the function of allowing the movement of the disconnecting part of the variable part (120) smoothly while reliably blocking reverse movement.

[0062] A plurality of continuous, tooth-shaped fixed teeth may be formed on the lower surface of the free end of the locking part (160), and these may be engaged in corresponding mesh with the tooth-shaped movable teeth formed on the outer surfaces of both ends of the variable part (120). The left movable teeth of the ends of the variable part (120) may be arranged symmetrically so as to mesh with the left fixed teeth of the internal hollow of the sliding part (130), and the right movable teeth of the ends of the variable part (120) may mesh with the right fixed teeth of the internal hollow of the sliding part (130).

[0063] When the above sliding part (130) descends due to the downward driving force of the decorative part (150), the left and right cut sections of the variable part (120) move symmetrically toward the center of the ring (100) along the left and right guide surfaces of the hollow inside the sliding part (130), respectively. During this process, the inclined surface of the moving tooth section of the cut section pushes the fixed tooth section of the two locking parts (160) outward and advances, and when the advance is completed, the locking part (160) is elastically restored and engages with the vertical surface of the tooth to block reverse movement, allowing ratchet coupling to be performed simultaneously on both sides.

[0064] Additionally, a release portion may be formed at the center of the length of the locking portion (160), and the release portion may be extended from one side of the locking portion (160) so as to be exposed to the side outside of the sliding portion (130). To this end, an open area may be formed on the side of the sliding portion (130) for external exposure and vertical movement of the release portion. Accordingly, when a user moves the release portion protruding to the outside of the sliding portion upward, the locking portions (160) on both sides are compressed upward, and the meshing state with the moving gear portions of the disconnected portions on both sides of the variable portion (120) can be released at once. As a result, the disconnected portions of the variable portion (120) can freely retract along the left and right guide surfaces of the internal hollow of the sliding portion (130) to enlarge and adjust the inner diameter of the ring (100).

[0065] According to the ratchet coupling structure described above, during the downward movement of the sliding part (130), the left and right disconnected parts of the variable part (120) are balancedly introduced toward the center of the ring (100), and the inner diameter is reduced stepwise, while unintentional deviation in the direction of inner diameter expansion can be blocked by the locking parts (160) on both sides. Additionally, since the user can release the ratchet coupling on both sides through the release part, the effect is that the inner diameter expansion adjustment can also be easily performed.

[0066] According to an embodiment of the present invention, an inner diameter variable ring (100) comprising a main body part (110), a variable part (120), a sliding part (130), a housing part (140), a decorative part (150), and / or a locking part (160) as described above, the inner diameter of the ring (100) can be adjusted stably and easily according to the user's needs, thereby improving wearing convenience and usability.

[0068] Although all components constituting an embodiment of the present invention have been described above as being combined or operating in combination, the present invention is not necessarily limited to such an embodiment. That is, within the scope of the purpose of the present invention, all components may be selectively combined in one or more ways to operate.

[0069] Furthermore, terms such as “include,” “compose,” or “have,” as described above, mean that the relevant component may be inherent unless specifically stated otherwise; therefore, they should be interpreted as allowing for the inclusion of additional components rather than excluding them. All terms, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains, unless otherwise defined. Commonly used terms, such as those defined in advance, should be interpreted in accordance with their meaning in the context of the relevant technology and, unless explicitly defined in the present invention, should not be interpreted in an ideal or overly formal sense.

[0070] Furthermore, the above description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention.

[0071] Accordingly, the embodiments disclosed in this invention are intended to illustrate, not limit, the technical concept of the invention, and the scope of the technical concept of the invention is not limited by these embodiments. The scope of protection of this invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of this invention. Explanation of the symbols

[0072] 100: Inner diameter variable ring according to one embodiment of the present invention 110 : Main body 120 : Variable part 130 : Sliding part 140 : Housing part 150 : Decorative part 151: Screw connection part 152 : Rod part 160 : catch

Claims

Claim 1 A main body portion having an annular structure forming the outer shape of a ring; a variable portion having an annular structure disposed on the inner surface of the main body portion and forming the inner diameter of the ring; a housing portion disposed on the upper part of the main body portion and having a through hole formed therein; and a decorative portion coupled to the through hole and having a decorative element disposed on its upper part. The device includes a sliding part in which an internal hollow is formed along the longitudinal direction and the severed ends of the variable part are respectively inserted into the left and right sides of the internal hollow, wherein the variable part has a gap formed by the severed upper portion and a lower portion fixedly coupled to the inner surface of the main body part, and the decorative part includes a cylindrical screw coupling part to which a decorative object is coupled to the upper part and a rod-shaped rod part extending from the lower part of the screw coupling part, wherein the screw coupling part is screw-coupled to the through hole by forming a screw thread on its side corresponding to the screw thread formed on the inner circumference of the through hole, and moves up and down in the axial direction of the through hole according to the user's screw rotation, and the sliding part is provided with a shape corresponding to the curvature of the severed ends of the variable part, and the sliding part descends by the pressure of the decorative part to move the severed ends of the variable part forward in a direction closer to each other, and when the pressure is released, it rises by the elastic restoring force of the variable part to move the severed ends of the variable part backward in a direction further apart from each other, thereby the The inner diameter of the ring is changed, and the sliding part comprises an elastic part made of an elastic material coupled to an inner surface, a locking part coupled to the surface of the elastic part and having a plurality of continuous tooth-shaped fixed teeth formed on the bottom surface of the free end and an open area formed at the longitudinal center, and a release part protruding from one side of the longitudinal center of the locking part, wherein the release part penetrates the open area and is exposed to the outside of the sliding part and is capable of moving upward within the open area, and the variable part has a movable tooth formed on the outer surface of the disconnected ends that meshes with the fixed teeth, so that when the sliding part descends,An inner diameter variable ring, wherein the inclined surface of the movable gear part moves forward while elastically deforming the locking part in the direction of the elastic part, and after forward movement, the fixed gear part and the movable gear part engage by the elastic restoration of the elastic part to restrict reverse movement, and the variable part is characterized by the fact that when a user presses the release part upward to move the locking part in the direction of the elastic part, the engagement state between the fixed gear part and the movable gear part is released, thereby causing the disconnected ends to move backward in a direction away from each other. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 An inner diameter variable ring according to claim 1, wherein the variable part is characterized in that a hinge structure is formed at each of the left and right ends of the lower region fixed to the main body part, and the two ends separated by the hinge structure rotate elastically.

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