Torsion coil spring and manufacturing method thereof, fastener for ornament and manufacturing method thereof, and ornament

Abstract

The invention provides a torsion coil spring and a manufacturing method thereof, a fastener for an ornament and a manufacturing method thereof, and an ornament, wherein the torsion coil spring can suppress and reduce a rotating acting force applied to two members which are freely connected in a rotating manner. The torsion coil spring includes: a coil portion; and a first arm portion and a second arm portion extending from the first end portion and the second end portion of the coil portion, respectively. The first arm portion includes: an insertion portion inserted into a hole provided in the first member; a first intermediate portion; the second arm portion includes: an engagement portion that engages with a step portion provided in a recess of the second member; a second intermediate portion; and a second bent portion. When viewed from a direction perpendicular to the center line of the coil part, the insertion part is bent toward the side where the coil part is provided, and the engagement part is bent toward the side where the coil part is provided, and extends parallel to the center line.

Description

Technical Field

[0001] The invention relates to a torsion coil spring and a manufacturing method thereof, a fastener for ornaments and a manufacturing method thereof, and ornaments. Background Art

[0002] Fasteners (also called clasps) used for connecting linear parts (chains, etc.) in accessories such as necklaces are known to have various types such as pull ring type, plug type, thread type, etc. In addition, fasteners with a rotating structure that realizes an open state and a closed state by two parts connected to each other in a freely rotatable manner are also known (see Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 09-299117 Summary of the invention

[0006] Problems to be solved by the invention

[0007] As a simple elastic mechanism for applying force to two parts connected to rotate freely, a leaf spring is generally used. However, since the size of the fastener used in the jewelry is small, it is difficult for the leaf spring to generate sufficient force. On the other hand, since the torsion coil spring can generate a larger elastic force than the leaf spring of the same size, the torsion coil spring is sometimes used as the elastic mechanism of the fastener.

[0008] When a torsion coil spring is used as a fastener, generally, a rotating shaft (shaft) is inserted through a hole of a coil portion formed by winding a wire into a coil shape. Fig.10 This is a diagram showing a case where a general torsion coil spring is used for a fastener. Fig.10 The fastener shown has two parts 701 and 702 connected to each other rotatably via a shaft 800, and a torsion coil spring 600. The torsion coil spring 600 has a coil portion 603 through which the shaft 800 is inserted, and two arms 601 and 602 extending from both ends of the coil portion 603. The top end of the arm portion 601 pushes the right end of the inner surface of the part 701, and the top end of the arm portion 602 pushes the left end of the inner surface of the part 702.

[0009] like Fig.10As shown, when viewed from a direction perpendicular to the rotation center line Lr passing through the rotation center of the shaft 800, the force F of the two arms 601 and 602 pressing the two components 701 and 702 generates a useless force that acts to rotate the shaft 800 to the left. This useless force does not contribute to the rotation of the components 701 and 702 about the rotation center line Lr, but increases the friction between the sliding portion of the component 701 or the component 702 and the shaft 800, thereby reducing the force and lowering the durability of the mechanism related to the rotation.

[0010] The present invention is made in view of the above situation, and its purpose is to provide a torsion coil spring and a manufacturing method thereof that can suppress and reduce the rotational force applied to two parts connected in a freely rotatable manner, to provide a fastener for jewelry using such a torsion coil spring and a manufacturing method thereof, and to provide a jewelry having such a fastener for jewelry.

[0011] Means for solving problems

[0012] The first embodiment of the present invention is a torsion coil spring, which generates a force that causes a first component and a second component that are connected to each other in a freely rotatable manner to rotate relative to each other, and comprises: a coil portion, which is formed by spirally winding a wire; a first arm portion, which extends from a first end portion of the coil portion; and a second arm portion, which extends from a second end portion of the coil portion, the first arm portion includes: an insertion portion, which is inserted into a hole provided in the first component; a first intermediate portion, which connects the first end portion to the insertion portion; and a first bent portion, which is bent between the insertion portion and the first intermediate portion, the second arm portion includes: a snap-fit ​​portion, which snaps into a step portion provided on the second component; a second intermediate portion, which connects the second end portion to the snap-fit ​​portion; and a second bent portion, which is bent between the second intermediate portion and the snap-fit ​​portion, the coil hole in the center of the coil portion is circular when viewed from a center line direction parallel to a center line of the spiral shape, the first end portion is located behind the center line when viewed from a first direction perpendicular to the center line, and the second end portion is located at the center when viewed from a second direction perpendicular to the center line. Behind the wire, the first middle portion extends along the first tangent of the circle of the coil hole as viewed from the center line direction, is connected to the first perpendicular line perpendicular to the center line as viewed from the first direction, and extends in the direction away from the center line as it moves away from the first end; the insertion portion extends in the direction away from the first tangent as it moves away from the first bending portion, toward the opposite side of the side where the coil hole is set relative to the first tangent; and extends in the direction away from the first perpendicular line as it moves away from the first bending portion, toward the side where the coil portion is set relative to the first perpendicular line as viewed from the first direction; the second middle portion extends along the second tangent of the circle of the coil hole as viewed from the center line direction, is connected to the second perpendicular line perpendicular to the center line as viewed from the second direction, and extends in the direction away from the center line as it moves away from the second end; the locking portion extends in the direction away from the second perpendicular line as it moves away from the second bending portion, toward the side where the coil portion is set relative to the second perpendicular line, parallel to the center line.

[0013] A second aspect of the present invention is a method for manufacturing a torsion coil spring, which is the method for manufacturing a torsion coil spring involved in the above-mentioned first aspect, comprising: a coil portion forming step of forming a coil portion by winding a wire material into a spiral shape; a first arm portion forming step of forming a first arm portion; and a second arm portion forming step of forming a second arm portion, the first arm portion forming step including a first bending step of bending a wire material extending from a first end portion at a first bending portion, the second arm portion forming step including a second bending step of bending a wire material extending from a second end portion at a second bending portion, the first bending step including bending a wire material extending from a first end portion at the first bending portion so as to The portion that becomes the insertion portion extends, as viewed from the center line direction, in a direction away from the first tangent as it moves away from the first bending portion, toward a direction opposite to the side on which the coil hole is set relative to the first tangent, and, as viewed from the first direction, in a direction away from the first perpendicular as it moves away from the first bending portion, toward a side on which the coil portion is set relative to the first perpendicular, and the second bending step includes bending the wire extending from the second end portion at the second bending portion so that the portion that becomes the locking portion extends, as viewed from the second direction, in a direction away from the second perpendicular as it moves away from the second bending portion, toward a side on which the coil portion is set relative to the second perpendicular, in parallel with the center line.

[0014] A third aspect of the present invention is a fastener for accessories, comprising: a first member and a second member rotatably connected to each other; and the torsion coil spring according to the first aspect, which generates a force for relatively rotating the first member and the second member.

[0015] The fourth aspect of the present invention is a method for manufacturing a fastener for jewelry, the fastener for jewelry comprising: a first component and a second component, which are rotatably connected; and a torsion coil spring involved in the above-mentioned first aspect, which generates a force that causes the first component and the second component to rotate relative to each other, comprising: a process of preparing the torsion coil spring; a process of preparing the first component and the second component that are rotatably connected; and a process of pressing the torsion coil spring between the first component and the second component until the insertion portion is abutted against the first component and the engaging portion is abutted against the second component, and at the same time, the insertion portion enters the hole of the first component and the engaging portion is engaged with the step portion of the second component.

[0016] A fifth aspect of the present invention is an ornament having the ornament fastener according to the third aspect.

[0017] Effects of the Invention

[0018] According to the present invention, there can be provided a torsion coil spring capable of suppressing and reducing a rotational force applied to two rotatably connected members and a method for manufacturing the same, a fastener for accessories using the torsion coil spring and a method for manufacturing the same, and an accessory having the fastener for accessories. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1A and Figure 1B It is a diagram showing an example of the torsion coil spring according to the present embodiment.

[0020] Figure 2A to Figure 2C It is a diagram showing an example of the torsion coil spring according to the present embodiment.

[0021] Figure 3 This is a diagram showing an example in which two members connected so as to be rotatable are biased by a torsion coil spring.

[0022] Figure 4A It is a diagram showing an example of a decorative article including a fastener according to the second embodiment. Figure 4B It is a perspective view showing an example of a fastener in an open state.

[0023] Figure 5A and Figure 5B This is a diagram showing an example of the first component. Figure 5C and Figure 5D This is a diagram showing an example of the second component.

[0024] Fig. 6A is a side view of the fastener, Figure 6B is a top view of the fastener.

[0025] Fig. 7A is a cross-sectional view showing the internal structure of the fastener, Figure 7B is a rear view of the fastener.

[0026] Fig. 8A This is a flowchart for explaining an example of a method for manufacturing a torsion coil spring according to the present embodiment. Figure 8B This is a flowchart for explaining an example of the steps of forming the arm portion.

[0027] Fig.9A and Fig. 9B It is a figure for demonstrating an example of the manufacturing method of the fastener concerning this embodiment.

[0028] Fig.10 It is a figure which shows the fastener for accessories using the conventional torsion coil spring.

[0029] Explanation of symbols

[0030] 1; torsion coil spring; 10; wire; 12; coil portion; 120; coil hole; 121; first end portion; 122; second end portion; 13; first arm portion; 131; first middle portion; 132; insertion portion; 133; first bent portion; 14; second arm portion; 141; second middle portion; 142; engaging portion; 143; second bent portion; 21; first component; 210; upper plate portion; 212; first side plate portion; 214; connecting hole; 215; hole; 22; second component; 220; bottom plate portion; 222; second side plate portion; 224; protrusion; 225; recess; 23; connecting portion; 3; fastener; 31; first component; 310; upper plate portion; 311; front side end part;312;first side plate;313;operating part;314;connecting hole;315;hole;32;second part;320;bottom plate;321;front end;322;second side plate;323;mounting part;324;protrusion;325;recess;325a,325b;step part;33;connecting part;4A;linear part;4B;linear part;41,41;ring part;5;accessory;Dc;center line direction;D1;first direction;D2;second direction;D3;third direction;Lc;center line;Lt1;first tangent;Lt2;second tangent;Lp1;first perpendicular;Lp2;second perpendicular;Lp3;third perpendicular;Lr;rotation center line. DETAILED DESCRIPTION

[0031] <First Embodiment>

[0032] Figure 1A to Figure 1B and Figure 2A to Figure 2C 1 is a diagram showing an example of a torsion coil spring according to the present embodiment. The torsion coil spring 1 according to the present embodiment is used to generate a force that causes two rotatably connected members (a first member 21 and a second member 22 described later) to rotate relative to each other. Figure 1A and Figure 1B As shown, the torsion coil spring 1 has: a coil portion 12, which is formed by spirally winding a wire 10; a first arm portion 13, which extends from a first end portion 121 which is an end of one side of the coil portion 12; and a second arm portion 14, which extends from a second end portion 122 which is an end of the other side of the coil portion 12.

[0033] Figure 1B “Dc” in ∝ represents a direction parallel to the center line Lc of the spiral shape of the coil portion 12 (hereinafter referred to as “center line direction Dc”). Figure 1A and Figure 2A "D1", "D2", and "D3" respectively represent directions perpendicular to the center line Lc (hereinafter, "D1", "D2", and "D3" are respectively referred to as "first direction D1", "second direction D2", and "third direction D3").

[0034] Figure 1A and Figure 2A This is a diagram of the torsion coil spring 1 as viewed from the center line direction Dc. Figure 1B This is a diagram of the torsion coil spring 1 as viewed from a third direction D3. Figure 2B This is a diagram of the torsion coil spring 1 as viewed from the first direction D1. Figure 2C This is a diagram of the torsion coil spring 1 as viewed from the second direction D2.

[0035] (Coil portion 12)

[0036] The coil portion 12 is Figure 1B , Figure 2B , Figure 2C In the example of FIG. 1 , the wire 10 is spirally wound about 3 and a half turns to form. In this example, the coil portion 12 is formed by winding closely together, but it can also be formed by another winding method that does not make the wires 10 close to each other. The hole in the center of the coil portion 12 (hereinafter referred to as "coil hole 120") as viewed from the center line direction Dc is as shown in FIG. Figure 1B As shown in FIG. 1 and FIG. 2 , the circle is substantially circular. The center line Lc passes through the center of the circle.

[0037] Figure 1A , Figure 2A “Lt1” and “Lt2” in ∝ represent tangent lines (hereinafter referred to as “first tangent line Lt1” and “second tangent line Lt2”, respectively) of the circle of the coil hole 120 as viewed from the center line direction Dc.

[0038] (First arm portion 13)

[0039] like Figure 1B As shown in FIG. 1 and FIG. 2 , the first arm portion 13 has an insertion portion 132, a first intermediate portion 131, and a first bent portion 133. The insertion portion 132 is inserted into a hole 215 ( Figure 3 The first intermediate portion 131 connects the first end portion 121 of the coil portion 12 and the insertion portion 132 . The first bent portion 133 is a bent portion between the first intermediate portion 131 and the insertion portion 132 .

[0040] like Figure 2B As shown, the first end 121 of the coil portion 12 connected to the first intermediate portion 131 is located behind the center line Lc when viewed from the first direction D1. The first direction D1 is a direction perpendicular to the center line Lc, and as shown in FIG. Figure 2A As shown, it is a direction substantially perpendicular to the first tangent line Lt1.

[0041] like Figure 2A As shown in FIG. 1 , when viewed from the center line direction Dc, the first intermediate portion 131 extends along the first tangent line Lt1 of the circle of the coil hole 120. Figure 2B As shown, when viewed from the first direction D1, the first middle portion 131 is connected to a perpendicular line Lp1 (hereinafter referred to as "first perpendicular line Lp1") perpendicular to the center line Lc, and moves away from the first end portion 121 in a direction away from the center line Lc ( Figure 2A ) extends above.

[0042] like Figure 2A As shown, when viewed from the center line direction Dc, the insertion portion 132 moves away from the first tangent line Lt1 as it moves away from the first bent portion 133, toward the side opposite to the side where the coil hole 120 is provided relative to the first tangent line Lt1 ( Figure 2A The first tangent line Lt1 in the middle extends in the direction of the upper side). Figure 2A In the example, the insertion portion 132 viewed from the center line direction Dc extends along the straight line L1.

[0043] In addition, if Figure 2B As shown, when viewed from the first direction D1, the insertion portion 132 moves away from the first bend portion 133 and away from the first perpendicular line Lp1, toward the side where the coil portion 12 is provided relative to the first perpendicular line Lp1 ( Figure 2B The left side of the first vertical line Lp1 in FIG. Figure 2B In the example, the insertion portion 132 viewed from the first direction D1 extends along the straight line L2.

[0044] like Figure 2A As shown, the first arm portion 13 is bent in the first bent portion 133 in such a manner that the first intermediate portion 131 and the insertion portion 132 form an obtuse angle when viewed from the center line direction Dc. That is, when viewed from the center line direction Dc, the angle θ1 ( Figure 2A ) is roughly included in the range greater than 90° and less than 180°.

[0045] In addition, if Figure 2B As shown, the first arm portion 13 is bent in the first bending portion 133 in such a way that the first intermediate portion 131 and the insertion portion 132 form an obtuse angle when viewed from the first direction D1. That is, when viewed from the first direction D1, the angle θ2 ( Figure 2B ) is roughly included in the range greater than 90° and less than 180°.

[0046] (Second arm portion 14)

[0047] like Figure 1B As shown in FIG. 1 and FIG. 2 , the second arm portion 14 has a locking portion 142, a second intermediate portion 141, and a second bent portion 134. The locking portion 142 and the step ( Figure 3The second intermediate portion 141 connects the second end portion 122 of the coil portion 12 to the engaging portion 142. The second bent portion 134 is a bent portion between the second intermediate portion 141 and the engaging portion 142.

[0048] like Figure 2C As shown, the second end 122 of the coil portion 12 connected to the second intermediate portion 141 is located behind the center line Lc when viewed from the second direction D2. The second direction D2 is a direction perpendicular to the center line Lc, and as shown in FIG. Figure 2A As shown, it is a direction substantially perpendicular to the second tangent line Lt2.

[0049] like Figure 2A As shown, when viewed from the center line direction Dc, the second intermediate portion 141 extends along the second tangent line Lt2 of the circle of the coil hole 120. Figure 2C As shown, when viewed from the second direction D2, the second middle portion 141 is connected to a perpendicular line Lp2 (hereinafter referred to as "second perpendicular line Lp2") perpendicular to the center line Lc, and moves away from the second end portion 122 in a direction away from the center line Lc ( Figure 2C ) extending below.

[0050] like Figure 2C As shown, when viewed from the second direction D2, the engaging portion 142 moves away from the second bending portion 134 and away from the second perpendicular line Lp2, toward the side where the coil portion 12 is provided relative to the second perpendicular line Lp2 ( Figure 2C In the direction of the second perpendicular line Lp2 in FIG. 1 , it extends approximately parallel to the center line Lc.

[0051] like Figure 2C As shown, when viewed from the second direction D2 , the engagement portion 142 has a length that reaches a perpendicular line Lp3 (hereinafter referred to as a “third perpendicular line Lp3 ”) perpendicular to a center line Lc passing through the center of the coil portion 12 .

[0052] like Figure 2C As shown, the second arm portion 14 is bent in the second bent portion 134 so that the second intermediate portion 141 and the engaging portion 142 form a substantially right angle when viewed from the second direction D2.

[0053] In addition, if Figure 2A As shown, toward the coil hole 120 , an angle θc formed by the first tangent line Lt1 and the second tangent line Lt2 is an acute angle.

[0054] Figure 3 The figure shows an example of applying force to two rotatably connected members (first member 21 and second member 22) by the above-mentioned torsion coil spring 1. The first member 21 and the second member 22 are rotatably connected by two connecting parts 23 and can rotate relative to each other around the rotation center line Lr. Figure 3 This is a diagram viewed from a direction perpendicular to the rotation center line Lr.

[0055] The first member 21 has a hole 215 for inserting the insertion portion 132, and the second member 22 has a recessed portion 225 formed with a step portion that engages with the engagement portion 142. The torsion coil spring 1 is held between the first member 21 and the second member 22 in a state where the insertion portion 132 is inserted and the engagement portion 142 is engaged with the step portion of the recessed portion 225. In this state, the center line Lc of the torsion coil spring 1 is substantially parallel to the rotation center line Lr.

[0056] The first component 21 has: an upper plate portion 210, which is formed with a hole 215; and two first side plate portions 212, which are arranged at both ends of the upper plate portion 210. In addition, the second component 22 has: a bottom plate portion 220, which is provided with a recessed portion 225 forming a step portion; and two second side plate portions 222, which are arranged at both ends of the bottom plate portion 220. The first side plate portion 212 on one side and the second side plate portion 222 on one side are connected by a connecting portion 23, and the first side plate portion 212 on the other side and the second side plate portion 222 on the other side are connected by another connecting portion 23. Figure 3 In the example of , the connection part 23 includes: a protrusion 224 provided on the second side plate part 222; and a connection hole 214 provided on the first side plate part 212. The protrusion 224 is inserted into the connection hole 214 and can be rotated in the connection hole 214.

[0057] According to this embodiment, Figure 2B As shown, when viewed from the first direction D1, the insertion portion 132 extends in a direction away from the first perpendicular line Lp1 as it moves away from the first bent portion 133, toward a side where the coil portion 12 is provided relative to the first perpendicular line Lp1. Figure 2C As shown, when viewed from the second direction D2, the engaging portion 142 extends in a direction away from the second perpendicular line Lp2 as it moves away from the second bent portion 134, toward a side where the coil portion 12 is provided relative to the second perpendicular line Lp2. Figure 1B As shown, the positions of the insertion portion 132 and the engaging portion 142 are Fig.10 Compared with the arm portions 601 and 602 in the conventional torsion coil spring 600 shown in FIG. 1 , the arm portions 601 and 602 are closer to the center side of the coil portion 12 when viewed from a direction perpendicular to the center line Lc. Thus, when the torsion coil spring 1 is arranged between the first component 21 and the first component 21 in such a manner that the center line Lc of the coil portion 12 is parallel to the rotation center line Lr, the direction of the force acting on the first component 21 and the first component 21 by the insertion portion 132 and the engagement portion 142 is the same as that of the arm portions 601 and 602 in the conventional torsion coil spring 600 shown in FIG. Fig.10Compared with the conventional torsion coil spring 600 shown in FIG. 1 , the force of the torsion coil spring 1 is closer to the direction perpendicular to the rotation center line Lr. The closer the force of the torsion coil spring 1 is to the direction perpendicular to the rotation center line Lr, the smaller the useless force (force that does not contribute to the rotation of the first component 21 and the second component 22 around the rotation center line Lr) that acts in a manner that the rotation center of the two connecting parts 23 is offset relative to the rotation center line Lr becomes, and the friction of the sliding part of the connecting part 23 (the sliding part of the protrusion 224 and the connecting hole 214) becomes smaller. Therefore, it is possible to effectively suppress the reduction of the rotational force applied to the first component 21 and the second component 22. In addition, since the useless force acting on the connecting part 23 is reduced, it is possible to suppress the reduction of durability.

[0058] According to this embodiment, Figure 3 As shown, the insertion portion 132 of the first arm portion 13 is inserted into the hole 215 of the first component 21, and the engaging portion 142 of the second arm portion 14 is engaged with the step portion of the recess 225 formed in the second component 22. Fig.10 As shown, the shaft of the rotating shaft is not inserted into the coil portion 12, and the torsion coil spring 1 can be made difficult to be separated from the first component 21 and the second component 22. In addition, the second arm portion 14 is held on the second component 22 by the engagement of the engagement portion 142 of the second arm portion 14 with the step portion of the second component 22, so that the second arm portion 14 is easily attached to the second component 22. Thus, each arm portion of the torsion coil spring 1 can be easily attached to the first component 21 and the second component 22.

[0059] According to this embodiment, Figure 2A As shown, when viewed from the center line direction Dc, the insertion portion 132 extends in a direction away from the first tangent line Lt1 as it moves away from the first bent portion 133, toward a direction opposite to the side where the coil hole 120 is provided with respect to the first tangent line Lt1. Thus, when the torsion coil spring 1 is arranged between the first member 21 and the first member 21, the insertion portion 132 can be easily inserted into the hole 215 of the first member 21.

[0060] In addition, in the first bent portion 133 of the first arm portion 13, the first intermediate portion 131 and the insertion portion 132 are bent so as to form an obtuse angle when viewed from the center line direction Dc and the first direction D1, respectively ( Figure 2A , Figure 2B ) Therefore, compared with the case where these angles are acute angles, the insertion portion 132 can be easily inserted into the hole 215 of the first member 21.

[0061] According to this embodiment, Figure 2CAs shown in FIG. 1 , when viewed from the second direction D2, the engaging portion 142 extends parallel to the center line Lc. Therefore, when the torsion coil spring 1 is arranged between the second member 22 and the first member 21 in which the step portion of the recessed portion 225 extends parallel to the rotation center line Lr, so that the center line Lc is parallel to the rotation center line Lr, the engaging portion 142 extending parallel to the center line Lc and the step portion of the recessed portion 225 extending parallel to the rotation center line Lr are engaged. As a result, when the first member 21 and the second member 22 rotate around the rotation center line Lr, the step portion of the recessed portion 225 and the engaging portion 142 remain parallel, so that these engagements are not easily disengaged.

[0062] According to this embodiment, Figure 2C As shown in FIG. 1 , when viewed from the second direction D2, the second intermediate portion 141 and the engaging portion 142 are bent at right angles at the second bending portion 134. Fig.10 Compared with the conventional torsion coil spring as shown, the width of the torsion coil spring 1 in the center line direction Dc can be reduced.

[0063] According to this embodiment, Figure 2C As shown, when viewed from the second direction D2, the engaging portion 142 has a length that reaches the third perpendicular line Lp3 (a perpendicular line perpendicular to the center line Lc passing through the center of the coil portion 12). Thus, the force of the engaging portion 142 pressing the second component 22 can be applied to the position of the third perpendicular line Lp3 (near the center of the coil portion 12), so that the direction of the force acting on the first component 21 and the first component 21 can be close to the direction orthogonal to the rotation center line Lr.

[0064] According to this embodiment, Figure 2A As shown, the angle formed by the first tangent line Lt1 and the second tangent line Lt2 is an acute angle toward the coil hole 120. Therefore, when the torsion coil spring 1 is inserted between the first component 21 and the second component 22, the first arm portion 13 and the first arm portion 13 are not easily blocked, so it is easy to perform the assembly operation of mounting the arm portions of the torsion coil spring 1 on the first component 21 and the second component 22.

[0065] According to this embodiment, Figure 3 As shown, the first side plate 212 on one side and the second side plate 222 on one side are connected by a connecting portion 23, and the first side plate 212 on the other side and the second side plate 222 on the other side are connected by another connecting portion 23. In addition, at least a portion of the torsion coil spring 1 is located between the two first side plates 212 of the first component 21 and between the two second side plates 222 of the second component 22. Thus, the shaft 800 is inserted into the coil portion 603. Fig.10Compared with the structure shown in the figure, the first member 21 and the second member 22 can be easily combined with the torsion coil spring 1.

[0066] <Second Embodiment>

[0067] Next, a second embodiment of the present invention will be described.

[0068] The second embodiment relates to a method of converting the above-mentioned torsion coil spring 1 ( Figure 1A to Figure 1B , Figure 2A to Figure 2C ) is a fastener used as a decorative part of a force-applying mechanism.

[0069] Figure 4A This is a diagram showing an example of a decorative article 5 including a fastener 3 using a torsion coil spring 1 according to the present embodiment. Figure 4A The illustrated accessory 5 is, for example, a necklace or a bracelet having separate linear components 4A, 4B and a fastener 3 connecting them into a loop. Figure 4B Fastener 3 shown in the open state.

[0070] like Figure 4A and Figure 4B As shown, the fastener 3 includes: a first member 31 and a second member 32 rotatably connected; two connecting portions 33 connecting the first member 31 and the second member 32 ; and an operating portion 313 for operating the first member 31 and the second member 32 to rotate.

[0071] Figure 5A 31 shows a side view of the first component, Figure 5B 31 is a top view of the first component 31. Figure 5A and Figure 5B As shown, the first component 31 has: a front side end portion 311, which is bent in a hook shape when viewed from the side; an upper plate portion 310, which extends and expands from the upper side of the front side end portion 311 to the back side; and two first side plate portions 312, which extend and expand from the side side of the front side end portion 311 to the back side. The two first side plate portions 312 extend downward from the left and right side ends of the upper plate portion 310. A hole 315 is formed at the end of the back side of the upper plate portion 310 for inserting the insertion portion 132 of the torsion coil spring 1.

[0072] The operation portion 313 is disposed on the back side of the outer surface of the upper plate portion 310. Figure 5B As shown, on the outer surface of the upper plate portion 310 observed along the penetration direction of the hole 315, the operating portion 313 covers the range including the hole 315. Fig. 7A and Figure 7B As shown, the operation portion 313 may also cover a range including the insertion portion 132 protruding from the hole 315. Figure 5AIn the example of FIG. 3 , the operating portion 313 is formed by a plate-shaped member extending from the end of the back side of the upper plate portion 310 and turning back to the front side. The operating portion 313 is annularly curved when viewed from the side, and covers the top of the hole 315 formed in the upper plate portion 310 .

[0073] The two first side plate portions 312 of the first member 31 are respectively formed with connection holes 314. The connection holes 314 are inserted with protrusions 324 of the second member 32, which will be described later.

[0074] Figure 5C 3 shows a side view of the second component 32, Figure 5D 32 shows a top view of the second component 32. Figure 5C and Figure 5D As shown in the figure, the second component 32 has: a front side end portion 321, which is bent in a hook shape when viewed from the side; a bottom plate portion 320, which extends and expands from the bottom side of the front side end portion 321 to the back side; two second side plate portions 322, which extend and expand from the side side of the front side end portion 321 to the back side; and a mounting portion 323, which is provided at the end portion of the back side of the bottom plate portion 320. The two second side plate portions 322 extend upward from the left and right side ends of the bottom plate portion 320. The mounting portion 323 has a mounting hole 326 for mounting the ring member 42 at the end of the linear member 4B.

[0075] The two second side plates 322 of the second member 32 each have a protrusion 324 protruding outward. The two protrusions 324 are respectively inserted into the connection holes 314 of the first side plate 312. One connection hole 314 and one protrusion 324 inserted therein constitute one connection portion 33. The first member 31 and the second member 32 are connected around the rotation center line Lr ( Figure 6B ) are connected so as to rotate freely.

[0076] like Figure 5D As shown in FIG. 1 , a recess 325 is formed on the inner surface (the surface facing the first component 31) of the bottom plate portion 320 of the second component 32. The recess 325 has a rotation center line Lr ( Figure 6B ) The step portions 325a and 325b extend in parallel. The step portions 325a and 325b engage with the engagement portion 142 of the torsion coil spring 1.

[0077] Fig. 6A 3 shows a side view of the fastener 3, Figure 6B A top view of the fastener 3 is shown. Fig. 7A 2 shows a cross-sectional view showing the internal structure of the fastener 3, Figure 7B3 is a rear view of the fastener 3. When the fastener 3 is in a closed state, the front end 311 of the first component 31 abuts against the front end 321 of the second component 32. Fig. 6A As shown in FIG. 1 , a closed space 30 is formed by the first component 31 and the second component 32. When the fastener 3 is in the open state, as shown in FIG. Figure 4B As shown, a gap is formed between the front end 311 and the front end 321, and the ring member 41 can enter and exit the closed space 30 through the gap. Figure 4A As shown, when the fastener 3 is connected to the ring member 41 of the linear member 4A, the fastener 3 is in an open state, and the ring member 41 is hooked on the front side end portion 321 bent in a hook shape, so that the fastener 3 is in a closed state. As a result, the ring member 41 is inserted into the closed space 30 and cannot be removed from the closed space. When the fastener 3 is removed from the ring member 41, the fastener 3 is in an open state, and the ring member 41 is taken out from the gap between the front side end portion 311 and the front side end portion 321, so that the fastener 3 is in a closed state.

[0078] The first component 31 and the second component 32 are urged to rotate relative to each other in the direction of the closed state by the elastic force of the torsion coil spring 1. When the first component 31 and the second component 32 are to be opened from the closed state, a finger or the like is pressed against the operating portion 313 provided on the first component 31 and a force is applied, so that the first component 31 and the second component 32 are relatively rotated against the force of the torsion coil spring 1. When the force applied to the operating portion 313 is released, the first component 31 and the second component 32 automatically return to the closed state.

[0079] like Fig. 7A and Figure 7B As shown, the torsion coil spring 1 is arranged in the space inside the fastener 3 (space surrounded by the first component 31 and the second component 32) in a state where the insertion portion 132 is inserted into the hole 315 of the first component 31 and the engaging portion 142 is engaged with the step portions 325a and 325b of the recess 325 of the second component 32. At least a portion of the torsion coil spring 1 (including the portion of the coil portion 12 in the example of the figure) is located between the two first side plates 312 and between the two second side plates 322. The center line Lc of the coil portion 12 of the torsion coil spring 1 is relative to the rotation center line Lr ( Figure 6B ) are roughly parallel.

[0080] According to this embodiment, compared with the first embodiment ( Figure 3 ) Similarly, the torsion coil spring 1 is arranged inside the first member 31 and the second member 32 in such a manner that the center line Lc of the coil portion 12 is parallel to the rotation center line Lr ( Figure 7B), the direction of the force acting on the first component 31 and the second component 32 through the insertion portion 132 and the engaging portion 142 is Fig.10 Compared with the conventional torsion coil spring 600 shown in FIG. 1 , the rotational force applied to the first component 31 and the second component 32 can be effectively suppressed from being reduced. In addition, since the useless force acting on the connecting portion 33 is reduced, the reduction in durability can be suppressed.

[0081] According to the present embodiment, on the outer surface of the first component 31 observed in the direction through which the hole 315 penetrates, the range including the hole 315 and the range including the insertion portion 132 protruding from the hole 315 are covered by the operating portion 313 ( Fig. 7A , Figure 7B ). Thus, the operation portion 313 can not only play the original function of easily rotating the first component 31 and the second component 32 with a finger or the like, but also play the function of preventing a finger or other object from contacting the insertion portion 132 protruding from the hole 315. Therefore, compared with the case where another component is provided to prevent contact with the insertion portion 132, the structure of the fastener 3 can be simplified.

[0082] According to this embodiment, Fig. 7A and Figure 7B As shown, the insertion portion 132 of the first arm portion 13 is inserted into the hole 315 of the first component 31, and the engaging portion 142 of the second arm portion 14 is engaged with the step portions 325a and 325b of the recess 325 formed in the second component 32. Fig.10 As shown, the shaft of the rotating shaft is inserted into the coil portion 12, and the torsion coil spring 1 can be prevented from being easily separated from the first component 31 and the second component 32. In addition, the second arm portion 14 is held on the second component 32 by the engagement of the engagement portion 142 of the second arm portion 14 with the step portions 325a and 325b of the second component 32, so that the arm portions of the torsion coil spring 1 can be easily mounted on the first component 31 and the second component 32.

[0083] According to this embodiment, Figure 5D and Figure 6B As shown, the step portions 325a, 325b of the second component 32 extend parallel to the rotation center line Lr. Fig. 7A and Figure 7B As shown in FIG. 1 , the torsion coil spring 1 is arranged between the first member 31 and the second member 32 in such a manner that the center line Lc is parallel to the rotation center line Lr. Figure 2CAs shown, when viewed from the second direction D2, the engaging portion 142 extends parallel to the center line Lc. Therefore, when the first component 21 and the second component 22 rotate around the rotation center line Lr, the step portions 325a, 325b of the second component 32 remain parallel to the engaging portion 142, so it is not easy to disengage these engagements.

[0084] According to this embodiment, Figure 6B and Figure 7B As shown, the first side plate portion 312 on one side and the second side plate portion 322 on one side are connected by a connecting portion 33, and the first side plate portion 312 on the other side and the second side plate portion 322 on the other side are connected by another connecting portion 33. In addition, at least a portion of the torsion coil spring 1 is located between the two first side plates 212 of the first component 21 and between the two second side plates 222 of the second component 22. Thus, the shaft 800 is inserted into the coil portion 603. Fig.10 Compared with the structure shown in the figure, the first member 31 and the second member 32 can be easily combined with the torsion coil spring 1.

[0085] Next, a method for manufacturing the above-mentioned torsion coil spring 1 according to the present embodiment will be described.

[0086] Fig. 8A 1 is a flowchart for explaining an example of a method for manufacturing a torsion coil spring 1. Fig. 8A In the manufacturing method shown, first, the coil portion 12 is formed by spirally winding the wire 10 (ST100). Next, the first arm portion 13 and the second arm portion 14 extending from the first end portion 121 and the second end portion 122 of the coil portion 12 are formed (ST105).

[0087] Figure 8B This is used to explain the process of forming the first arm portion 13 and the second arm portion 14 (ST105: Fig. 8A ) is a flowchart of an example.

[0088] ST200:

[0089] The step of forming the first arm portion 13 includes a step of bending the wire 10 extending from the first end portion 121 of the coil portion 12 at the first bending portion 133 (first bending step).

[0090] In the first bending process, Figure 2A As shown, the wire 10 extending from the first end 121 is bent at the first bending portion 133 so that the portion that becomes the insertion portion 132 extends in a direction away from the first tangent line Lt1 as it moves away from the first bending portion 133, toward a direction opposite to the side where the coil hole 120 is provided relative to the first tangent line Lt1 as viewed from the center line direction Dc. Figure 2B As shown, the wire 10 extending from the first end 121 is bent at the first bending portion 133 so that the portion becoming the insertion portion 132 extends in the direction away from the first perpendicular line Lp1 as it moves away from the first bending portion 133, toward the side where the coil portion 12 is set relative to the first perpendicular line Lp1 as viewed from the first direction D1.

[0091] ST205:

[0092] The step of forming the second arm portion 14 includes a step of bending the wire 10 extending from the second end portion 122 of the coil portion 12 at the second bending portion 134 (second bending step).

[0093] In the second bending process, Figure 2C As shown, the wire 10 extending from the second end 122 is bent at the second bending portion 134 so that the portion that becomes the locking portion 142 extends parallel to the center line Lc in the direction away from the second perpendicular line Lp2 as it moves away from the second bending portion 134, toward the side on which the coil portion 12 is set relative to the second perpendicular line Lp2.

[0094] The first bending step of step ST200 and the second bending step of step ST205 may be performed in different orders or simultaneously. In addition, each step of the manufacturing method of the torsion coil spring 1 may be performed manually, or at least a part of the steps may be performed using a machine tool.

[0095] Next, a method for manufacturing the fastener 3 using the above-described torsion coil spring 1 according to the present embodiment will be described.

[0096] In the method for manufacturing the fastener 3, first, the above-mentioned torsion coil spring 1 is prepared. The torsion coil spring 1 can be, for example, Fig. 8A , Figure 8B Made by the method shown.

[0097] In this manufacturing method, a first member 31 and a second member 32 are prepared that are rotatably connected. For example, the first member 31 ( Figure 5A , Figure 5B ) and the second component 32 ( Figure 5C , Figure 5D ).like Fig.9A As shown, the first member 31 and the second member 32 are assembled into a rotatably connected state by inserting the two protrusions 324 of the second member 32 into the two connection holes 314 of the first member 31, respectively.

[0098] Next, the torsion coil spring 1 is mounted on the first member 31 and the second member 32 which are rotatably connected. That is, the torsion coil spring 1 is pressed between the first member 31 and the second member 32 until the insertion portion 132 abuts against the first member 31 and the engagement portion 142 abuts against the second member 32, and the insertion portion 132 enters the hole 315 of the first member 31 and the engagement portion 142 engages with the step portions 325a and 325b of the second member 32. For example, Fig. 9B As shown in the figure, the torsion coil spring 1 is pressed into the first component 31 and the second component 32 from the opening formed on the back side of the connected first component 31 and the second component 32. The elastic force of the torsion coil spring 1 generates a strong force for inserting the insertion portion 132 into the hole 315 of the first component 31 and a strong force for engaging the engagement portion 142 with the step portions 325a and 325b of the second component 32, so that the torsion coil spring 1 is firmly attached to the first component 31 and the second component 32 and is not easily detached.

[0099] The above-mentioned embodiment is an example, and the present embodiment further includes various modified examples.

[0100] For example, in the torsion coil spring of the present embodiment, the number of turns of the wire of the coil portion, the thickness of the wire, the cross-sectional shape of the wire, the ratio of the outer shape to the inner diameter of the coil portion, the bending position of the arm portion observed from each direction, the length of each straight portion of the arm portion observed from each direction, the bending angle of each straight portion of the arm portion observed from each direction, the angle between the straight portions of the two arms, etc. are not limited to Figure 1A to Figure 1B , Figure 2A to Figure 2C Examples shown in .

[0101] Figure 6A to Figure 6B and Figure 7A to Figure 7B The fastener 3 for decorative articles shown is a finished product after assembly, but the present embodiment is not limited to these examples. That is, the present embodiment also includes an assembly kit for assembling the fastener for decorative articles. Figure 6A to Figure 6B and Figure 7A to Figure 7B The assembly of the fastener 3 for accessories shown includes a first member 31, a second member 32, and a torsion coil spring 1 as a biasing member.

[0102] Furthermore, the torsion coil spring according to the present embodiment is not limited to fasteners for accessories, but can be applied to various instruments and the like, and is particularly suitable for instruments and the like that require miniaturization.

Claims

1. A torsion coil spring that generates a force that causes a first member and a second member that are rotatably connected to each other to rotate relative to each other, characterized in that: have: A coil portion, which is formed by spirally winding a wire; a first arm portion extending from a first end portion of the coil portion; and a second arm portion extending from a second end portion of the coil portion, The first arm comprises: an insertion portion inserted into the hole provided in the first component; a first intermediate portion connecting the first end portion and the insertion portion; and a first bent portion, which is bent between the insertion portion and the first intermediate portion; The second arm comprises: a clamping portion, which is clamped with a step portion provided on the second component; A second intermediate portion connecting the second end portion and the engaging portion; and A second bent portion is bent between the second middle portion and the engaging portion, The coil hole at the center of the coil portion is circular when viewed from the center line direction parallel to the center line of the spiral shape. The first end is located behind the center line when viewed from a first direction perpendicular to the center line. The second end is located behind the center line when viewed from a second direction perpendicular to the center line. The first intermediate portion extends along a first tangent line of the circle of the coil hole when viewed from the center line direction. When viewed from the first direction, the first end portion is connected to a first vertical line perpendicular to the center line, and extends in a direction away from the center line as it moves away from the first end portion. The insertion portion extends in a direction away from the first tangent line as it moves away from the first bent portion when viewed from the center line, toward a direction opposite to a side where the coil hole is provided with respect to the first tangent line. The coil portion extends in a direction away from the first perpendicular line as the coil portion moves away from the first bent portion when viewed from the first direction, The second intermediate portion extends along a second tangent line of the circle of the coil hole when viewed from the center line direction. When viewed from the second direction, the second end portion is connected to a second vertical line perpendicular to the center line, and extends in a direction away from the center line as it moves away from the second end portion. The engaging portion extends parallel to the center line in a direction away from the second perpendicular line as the second bent portion moves away from the second perpendicular line, toward a side where the coil portion is provided with respect to the second perpendicular line, as viewed from the second direction.

2. The torsion coil spring according to claim 1, characterized in that: The first arm portion is bent in the first bent portion so that the first intermediate portion and the insertion portion form an obtuse angle when viewed from the center line direction and the first direction.

3. The torsion coil spring according to claim 1, characterized in that: The second arm portion is bent in the second bent portion so that the second intermediate portion and the engaging portion form a right angle when viewed from the second direction.

4. The torsion coil spring according to claim 1, characterized in that: The engaging portion has a length reaching a third perpendicular line perpendicular to the center line passing through the center of the coil portion when viewed from the second direction.

5. The torsion coil spring according to claim 1, characterized in that: Towards the coil hole, an angle formed by the first tangent line and the second tangent line is an acute angle.

6. A method for manufacturing a torsion coil spring, which is the method for manufacturing a torsion coil spring according to any one of claims 1 to 5, characterized in that: have: a coil portion forming step of forming the coil portion by winding the wire material in a spiral shape; A first arm portion forming step of forming the first arm portion; as well as A second arm portion forming step of forming the second arm portion, The first arm portion forming step includes a first bending step of bending the wire extending from the first end portion at the first bending portion. The second arm portion forming step includes a second bending step of bending the wire extending from the second end portion at the second bending portion. The first bending step includes bending the wire extending from the first end at the first bending portion so that the portion to become the insertion portion extends in a direction opposite to the side where the coil hole is provided with respect to the first tangent line as it moves away from the first bending portion as viewed from the center line direction, and extends in a direction away from the first perpendicular line as it moves away from the first bending portion as viewed from the first direction to the side where the coil portion is provided with respect to the first perpendicular line, The second bending process includes bending the wire extending from the second end at the second bending portion so that the portion becoming the locking portion extends parallel to the center line in a direction away from the second perpendicular line as it moves away from the second bending portion, toward a side where the coil portion is provided relative to the second perpendicular line.

7. A fastener for ornaments, characterized in that: have: The first member and the second member are rotatably connected; and The torsion coil spring according to any one of claims 1 to 5 generates a force causing the first member and the second member to rotate relative to each other.

8. The fastener for accessories according to claim 7, characterized in that: The first component and the second component are capable of relatively rotating around a rotation center line. The center line of the torsion coil spring is parallel to the rotation center line.

9. The fastener for accessories according to claim 7, characterized in that: having two connecting parts that respectively connect the first member and the second member so as to be rotatable, The first component includes two first side panels facing each other. The second component includes two second side plates facing each other. The first side plate portion on one side and the second side plate portion on one side are connected by one of the connecting portions, The first side plate portion of the other side and the second side plate portion of the other side are connected by another of the connecting portions, At least a portion of the torsion coil spring is located between the two first side plate portions and between the two second side plate portions.

10. The fastener for accessories according to claim 7, characterized in that: having an outer surface of the first component, and is used to make the first component rotate relative to the second component, The operation portion covers at least a range including the hole and the insertion portion protruding from the hole, on the outer surface of the first member viewed in a direction through the hole.

11. A method for manufacturing a fastener for jewelry, characterized in that: The fastener for accessories has: The first member and the second member are rotatably connected; and The torsion coil spring according to any one of claims 1 to 5, which generates a force causing the first member and the second member to rotate relative to each other. The method comprises: a step of preparing the torsion coil spring; a step of preparing the first member and the second member rotatably connected to each other; and The step of pressing the torsion coil spring between the first component and the second component until the insertion portion abuts against the first component and the engagement portion abuts against the second component, the insertion portion enters the hole of the first component and the engagement portion engages with the step portion of the second component.

12. A kind of ornament, characterized in that: A fastener for accessories according to claim 7.

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