Torsion coil spring, fastener for accessory, and accessory

Abstract

The utility model provides a torsion spiral spring, a fastener for an ornament and the ornament, wherein the torsion spiral spring can restrain and reduce rotation acting force applied to two parts which are freely and rotatably connected. 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 utility model relates to a torsion coil spring, a fastener for ornaments and an ornament. BACKGROUND

[0002] Fasteners (also called clasps) for linking line-shaped members (chains, etc.) in ornaments such as necklaces are known in various types such as a pull ring type, an insert type, and a screw type. In addition, a fastener having a structure that realizes an open state and a closed state by rotating two members that are rotatably linked is also known (see Patent Document 1).

[0003] PRIOR ART DOCUMENTS

[0004] PATENT DOCUMENTS

[0005] Patent Document 1: Japanese Patent Application Publication No. 09-299117 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] As a simple elastic mechanism that exerts force on two members that are rotatably linked, a leaf spring is generally used. However, since the fastener used for an ornament is small in size, a leaf spring does not easily generate sufficient force. On the other hand, since a torsion coil spring can generate a larger elastic force than a leaf spring of the same size, a torsion coil spring is sometimes used as an elastic mechanism of a fastener.

[0008] In the case where a fastener uses a torsion coil spring, generally, a rotation shaft (a shaft) is inserted through a hole of a coil portion formed by winding a wire in a coil shape. Figure 10 is a drawing showing a case where a general torsion coil spring is used for a fastener. Figure 10 The fastener shown has two members 701, 702 that are rotatably linked via a shaft 800, and a torsion coil spring 600. The torsion coil spring 600 has a coil portion 603 for the shaft 800 to be inserted through, and two arm portions 601, 602 that extend from both ends of the coil portion 603. The top end of the arm portion 601 pushes against the right end of the inner surface of the member 701, and the top end of the arm portion 602 pushes against the left end of the inner surface of the member 702.

[0009] As Figure 10As shown, from the direction perpendicular to the rotation center line Lr passing through the rotation center of the shaft 800, the force F of the two arm portions 601, 602 pushing the two members 701, 702 generates a useless force acting in a manner to rotate the shaft 800 to the left. This useless force does not contribute to the rotation of the members 701, 702 around the rotation center line Lr, on the other hand, since it increases the friction of the sliding portions of the members 701 or 702 with the shaft 800, it becomes a cause of reducing the acting force, lowering the durability of the mechanism related to the rotation.

[0010] The utility model makes up for the deficiency that the prior art has, and has the beneficial effects that: the torsion coil spring can inhibit the reduction of the rotation acting force applied to the two members rotatably connected, and the manufacturing method thereof is provided; the ornament fastener using the torsion coil spring and the manufacturing method thereof are provided; and the ornament having the ornament fastener is provided.

[0011] Means for solving the problem

[0012] The utility model discloses a first mode is a kind of torsion coil spring, it generates the acting force that makes first component and second component relatively rotate rotatably linked, with: coil portion, it is made into by wire material spiral winding;First arm portion, it extends from the first end portion of coil portion;And second arm portion, it extends from the second end portion of coil portion, first arm portion includes: insertion portion, it is inserted the hole that first component is provided;First intermediate portion, it is connected with the insertion portion to first end portion;And first bending portion, it is bent between insertion portion and first intermediate portion, second arm portion includes: engagement portion, it is engaged with the step portion that is provided in second component;Second intermediate portion, it is connected with the engagement portion to second end portion;And second bending portion, it is bent between second intermediate portion and engagement portion, the coil hole of the center of coil portion is circular from the center line direction parallel with the center line of spiral shape, first end portion is observed from the first direction perpendicular to center line, located the back of center line, second end portion is observed from the second direction perpendicular to center line, located the back of center line, first intermediate portion is observed from center line direction, along the first tangent of the circular of coil hole, it is connected with the first vertical line perpendicular to center line from the first direction, and extend to the direction away from center line with being away from first end portion, insertion portion is observed from center line direction, to the direction away from the first tangent with being away from first bending portion, to the opposite side of the direction of the side that coil hole is arranged relative to first tangent, it is extended to the direction of the side that coil portion is arranged relative to first vertical line from the first direction with being away from first bending portion, second intermediate portion is observed from center line direction, along the second tangent of the circular of coil hole, it is connected with the second vertical line perpendicular to center line from the second direction, and extend to the direction away from center line with being away from second end portion, engagement portion is observed from the second direction, to the direction away from the second vertical line with being away from second bending portion, to the direction of the side that coil portion is arranged relative to second vertical line, it extends in parallel with center line.

[0013] The second mode of the utility model is a manufacturing method of a torsion coil spring, which is the manufacturing method of the torsion coil spring involved in the above-mentioned first mode, and has: a coil portion forming process, which forms the coil portion by winding the wire in a spiral shape; a first arm portion forming process, which forms the first arm portion; and a second arm portion forming process, which forms the second arm portion, the first arm portion forming process includes a first bending process of bending the wire extending from the first end portion at the first bending portion, the second arm portion forming process includes a second bending process of bending the wire extending from the second end portion at the second bending portion, the first bending process includes bending the wire extending from the first end portion at the first bending portion so that the part that becomes the insertion portion extends, as viewed from the center line direction, toward the direction away from the first tangent line with the first bending portion away, to the opposite side of the side where the coil hole is arranged relative to the first tangent line, and, as viewed from the first direction, toward the direction away from the first perpendicular line with the first bending portion away, to the direction of the side where the coil portion is arranged relative to the first perpendicular line, and the second bending process includes bending the wire extending from the second end portion at the second bending portion so that the part that becomes the engagement portion extends, as viewed from the second direction, toward the direction parallel to the center line, away from the second perpendicular line with the second bending portion away, to the direction of the side where the coil portion is arranged relative to the second perpendicular line.

[0014] The third mode of the utility model is a fastener for accessories, which has: a first component and a second component, which are rotatably connected; and the torsion coil spring involved in the above-mentioned first mode, which generates the acting force that makes the first component and the second component relatively rotate.

[0015] The fourth mode of the utility model is a manufacturing method of a fastener for accessories, the fastener for accessories has: a first component and a second component, which are rotatably connected; and the torsion coil spring involved in the above-mentioned first mode, which generates the acting force that makes the first component and the second component relatively rotate, and has: a process of preparing the torsion coil spring; a process of preparing the first component and the second component, which are rotatably connected; and a process of pressing the torsion coil spring between the first component and the second component, in which the insertion portion abuts against the first component and the engagement portion abuts against the second component, at the same time, the insertion portion enters the hole of the first component and the engagement portion engages with the stepped portion of the second component.

[0016] The fifth mode of the utility model is an accessory, which has the fastener for accessories of the above-mentioned third mode.

[0017] Utility model effect

[0018] According to the present application, a torsion coil spring capable of suppressing and reducing the rotational force applied to two components rotatably connected, a manufacturing method thereof, a jewelry fastener using the same, a manufacturing method thereof, and a jewelry having the same can be provided. BRIEF DESCRIPTION OF DRAWINGS

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

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

[0021] Figure 3 is a diagram showing an example of the torsion coil spring according to the present embodiment.

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

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

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

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

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

[0027] Figure 9A And Figure 9B is a diagram for explaining an example of the manufacturing method of the fastener according to the present embodiment.

[0028] Figure 10 is a diagram showing a fastener for jewelry using the existing torsion coil spring.

[0029] Symbol explanation 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 intermediate portion; 132; insertion portion; 133; first bent portion; 14; second arm portion; 141; second intermediate portion; 142; engagement portion; 143; second bent portion; 21; first member; 210; upper plate portion; 212; first side plate portion; 214; linking hole; 215; hole; 22; second member; 220; bottom plate portion; 222; second side plate portion; 224; protrusion portion; 225; recessed portion; 23; linking portion; 3; fastener; 31; first member; 310; upper plate portion; 311; front side end portion; 312; first side plate portion; 313; operation portion; 314; linking hole; 315; hole; 32; second member; 320; bottom plate portion; 321; front side end portion; 322; second side plate portion; 323; mounting portion; 324; protrusion portion; 325; recessed portion; 325a, 325b; step portion; 33; linking portion; 4A; wire member; 4B; wire member; 41, 41; ring member; 5; ornament; Dc; center line direction; D1; first direction; D2; second direction; D3; third direction; Lc; center line; Lt1; first tangent line; Lt2; second tangent line; Lp1; first perpendicular line; Lp2; second perpendicular line; Lp3; third perpendicular line; Lr; rotation center line. DETAILED DESCRIPTION

[0030] <First Embodiment>

[0031] Figures 1A-1B and Figures 2A-2C is a drawing 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 an acting force that causes relative rotation of two members (a first member 21 and a second member 22, which will be described later) that are linked to each other so as to be rotatable freely. As shown in Figure 1A and Figure 1B , the torsion coil spring 1 has a coil portion 12 that is spirally wound by a wire 10, a first arm portion 13 that extends from a first end portion 121 that is one end portion of the coil portion 12, and a second arm portion 14 that extends from a second end portion 122 that is the other end portion of the coil portion 12.

[0032] Figure 1B “Dc” in the above-mentioned “Dc” indicates a direction parallel to a 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” in the above-mentioned “D1”, “D2”, and “D3” respectively indicate 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”).

[0033] 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 showing 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.

[0034] (Coil portion 12)

[0035] The coil portion 12 is Figure 1B 、 Figure 2B 、 Figure 2C In the example, the wire 10 is spirally wound about 3 and a half turns. 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") observed 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.

[0036] Figure 1A 、 Figure 2A “Lt1” and “Lt2” in FIG. 5 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.

[0037] (First arm portion 13)

[0038] like Figure 1B As shown in FIG. 1 and FIG. 2 , the first arm portion 13 includes 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 .

[0039] like Figure 2B As shown, the first end portion 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.

[0040] like Figure 2A As shown, 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 and away from the center line Lc ( Figure 2A ) extending above.

[0041] like Figure 2A As shown, as 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 extends along the straight line L1 when viewed from the center line direction Dc.

[0042] In addition, if Figure 2B As shown, when viewed from the first direction D1, the insertion portion 132 moves away from the first perpendicular line Lp1 as it moves away from the first bent portion 133, 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 the middle extends in the direction of Figure 2B In the example, the insertion portion 132 extends along a straight line L2 when viewed from the first direction D1.

[0043] like Figure 2A As shown, the first arm portion 13 is bent in the first bent portion 133 so 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°.

[0044] In addition, if Figure 2B As shown, the first arm portion 13 is bent in the first bent portion 133 so 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°.

[0045] (Second arm portion 14)

[0046] like Figure 1B As shown in FIG. 1 , the second arm portion 14 includes a locking portion 142, a second intermediate portion 141, and a second bent portion 134. The locking portion 142 is provided with a step ( Figure 3) engages. The second intermediate portion 141 connects the second end portion 122 of the coil portion 12 and the engaging portion 142. The second bent portion 134 is a portion bent between the second intermediate portion 141 and the engaging portion 142.

[0047] As shown in Figure 2C , the second end portion 122 of the coil portion 12 connected with 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 Figure 2A , is a direction substantially perpendicular to the second tangent line Lt2.

[0048] As shown in Figure 2A , the second intermediate portion 141 extends along the circular second tangent line Lt2 of the coil hole 120 when viewed from the center line direction Dc. In addition, as shown in Figure 2C , the second intermediate portion 141 meets a perpendicular line Lp2 (hereinafter, referred to as "second perpendicular line Lp2") perpendicular to the center line Lc when viewed from the second direction D2, and extends in a direction away from the center line Lc (downward of Figure 2C ) as it moves away from the second end portion 122.

[0049] As shown in Figure 2C , the engaging portion 142 extends in a direction substantially parallel to the center line Lc when viewed from the second direction D2, in a direction away from the second perpendicular line Lp2 as it moves away from the second bent portion 134, to a direction in which the coil portion 12 is disposed on a side (right side of the second perpendicular line Lp2 in Figure 2C ) opposite to the second perpendicular line Lp2.

[0050] As shown in Figure 2C , the engaging portion 142 has a length reaching a perpendicular line Lp3 (hereinafter, referred to as "third perpendicular line Lp3") perpendicular to the center line Lc passing through the center of the coil portion 12 when viewed from the second direction D2.

[0051] As shown in Figure 2C , the second arm portion 14 is bent in the second bent portion 134 when viewed from the second direction D2, in a manner in which the second intermediate portion 141 and the engaging portion 142 form a substantially right angle.

[0052] In addition, as shown in Figure 2A , the angle θc formed by the first tangent line Lt1 and the second tangent line Lt2 toward the coil hole 120 is an acute angle.

[0053] Figure 3 is a diagram showing an example in which the torsion coil spring 1 described above applies a force to two members (first member 21, second member 22) rotatably coupled. The first member 21 and the second member 22 are rotatably coupled by two coupling portions 23, and are capable of relative rotation about a rotation center line Lr.Figure 3 is a view as seen from a direction perpendicular to the rotation center line Lr.

[0054] The first member 21 has a hole 215 into which the insertion portion 132 is inserted, and the second member 22 has a recess 225 formed with a stepped portion with which the engagement portion 142 is engaged. The torsion coil spring 1 is held between the first member 21 and the second member 22 in a state in which the insertion portion 132 is inserted and the engagement portion 142 is engaged with the stepped portion of the recess 225. In this state, the center line Lc of the torsion coil spring 1 is substantially parallel to the rotation center line Lr.

[0055] The first member 21 has an upper plate portion 210 formed with the hole 215 and two first side plate portions 212 provided at both ends of the upper plate portion 210. In addition, the second member 22 has a bottom plate portion 220 provided with the recess 225 formed with the stepped portion and two second side plate portions 222 provided at both ends of the bottom plate portion 220. One of the first side plate portions 212 and one of the second side plate portions 222 are connected by one link portion 23, and the other of the first side plate portions 212 and the other of the second side plate portions 222 are connected by the other link portion 23. In this embodiment, the link portion 23 includes a protrusion portion 224 provided to the second side plate portion 222 and a link hole 214 provided to the first side plate portion 212. The protrusion portion 224 is inserted into the link hole 214, and the protrusion portion 224 is able to rotate in the link hole 214. Figure 3

[0056] According to the present embodiment, as shown in FIG. 1, the insertion portion 132 extends in a direction away from the first perpendicular line Lp1 toward a direction in which the coil portion 12 is disposed on one side with respect to the first perpendicular line Lp1 as seen from the first direction D1. In addition, as shown in FIG. 2, the engagement portion 142 extends in a direction away from the second perpendicular line Lp2 toward a direction in which the coil portion 12 is disposed on one side with respect to the second perpendicular line Lp2 as seen from the second direction D2. That is, as shown in FIG. 3, the positions of the insertion portion 132 and the engagement portion 142 are closer to the central side of the coil portion 12 as seen from a direction perpendicular to the center line Lc compared to the arm portions 601, 602 in the existing torsion coil spring 600 shown in FIG. 4. Figure 2B Figure 2C Figure 1B Figure 10 Figure 10 ​​​​​In comparison with the existing torsion coil spring 600 shown, the force of the torsion coil spring 1 is closer to the direction orthogonal to the rotation center line Lr. The closer the force of the torsion coil spring 1 is to the direction orthogonal to the rotation center line Lr, the smaller the useless force (a force that does not contribute to the rotation of the first member 21 and the second member 22 about the rotation center line Lr) acting in a manner in which the rotation center of the two link portions 23 is offset with respect to the rotation center line Lr, and the smaller the friction of the sliding portions (the sliding portions of the protrusion portions 224 and the link holes 214) of the link portions 23. Therefore, the reduction in the force of the rotation applied to the first member 21 and the second member 22 can be effectively suppressed. In addition, since the useless force acting on the link portions 23 is small, the reduction in durability can be suppressed.

[0057] According to the present embodiment, as shown in Figure 3 , the insertion portion 132 of the first arm portion 13 is inserted into the hole 215 of the first member 21, and the engagement portion 142 of the second arm portion 14 is engaged with the step portion of the recess 225 formed in the second member 22. Therefore, even if the shaft of the rotation shaft is not inserted through the coil portion 12 as shown in Figure 10 , the torsion coil spring 1 can be prevented from easily coming off the first member 21 and the second member 22. In addition, by the engagement of the engagement portion 142 of the second arm portion 14 with the step portion of the second member 22, the second arm portion 14 is held to the second member 22, and thus the second arm portion 14 can be easily attached to the second member 22. Thus, each arm portion of the torsion coil spring 1 can be easily attached to the first member 21 and the second member 22.

[0058] According to the present embodiment, as shown in Figure 2A , the insertion portion 132 extends in a direction in which the first tangent line Lt1 is distanced as the first bent portion 133 is distanced, from the center line direction Dc toward the opposite side of the side on which the coil hole 120 is provided with respect to the first tangent line Lt1. Thus, when the torsion coil spring 1 is disposed 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.

[0059] 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 at obtuse angles with respect to the center line direction Dc and the first direction D1, respectively, as shown in Figure 2A , Figure 2B . Thus, the insertion portion 132 can be easily inserted into the hole 215 of the first member 21 in comparison with the case in which the angles are acute.

[0060] According to the present embodiment, as shown in Figure 2CAs shown, the engaging portion 142 extends parallel to the center line Lc when viewed from the second direction D2. Therefore, when the torsion coil spring 1 is arranged between the second component 22 and the first component 21, with the stepped portion of the recessed portion 225 extending parallel to the rotational center line Lr, so that the center line Lc is parallel to the rotational center line Lr, the engaging portion 142 extending parallel to the center line Lc engages with the stepped portion of the recessed portion 225 extending parallel to the rotational center line Lr. As a result, when the first component 21 and the second component 22 rotate about the rotational center line Lr, the stepped portion of the recessed portion 225 and the engaging portion 142 remain parallel, making it difficult for these engaged portions to disengage.

[0061] According to this embodiment, Figure 2C As shown, 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. Figure 10 Compared with the conventional torsion coil spring shown in FIG. 1 , the width of the torsion coil spring 1 in the center line direction Dc can be reduced.

[0062] 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 to the center line Lc passing through the center of the coil portion 12). As a result, 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), thereby making the direction of the force acting on the first component 21 and the first component 21 closer to the direction perpendicular to the rotation center line Lr.

[0063] According to this embodiment, Figure 2A As shown, the angle formed by the first tangent line Lt1 and the second tangent line Lt2 toward the coil hole 120 is acute. As a result, when the torsion coil spring 1 is inserted between the first member 21 and the second member 22, the first arm portion 13 is less likely to become an obstruction, thereby facilitating the assembly operation of attaching the arms of the torsion coil spring 1 to the first member 21 and the second member 22.

[0064] According to this embodiment, Figure 3 As shown, 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. 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. Figure 10Compared with the structure shown, the first member 21 and the second member 22 can be simply combined with the torsion coil spring 1.

[0065] [Second Embodiment]

[0066] Next, the second embodiment of the present application will be described.

[0067] The second embodiment relates to a fastener for accessories using the torsion coil spring 1 described above as a force applying mechanism. Figures 1A-1B 、 Figures 2A-2C

[0068] Figure 4A is a view showing an example of an accessory 5 including a fastener 3 using a torsion coil spring 1 according to the present embodiment. Figure 4A The accessory 5 shown is, for example, a necklace or a bracelet, and has separate linear members 4A and 4B and a fastener 3 connecting these into a ring shape. Figure 4B The fastener 3 in the open state is shown.

[0069] As shown in Figure 4A and Figure 4B , the fastener 3 has a first member 31 and a second member 32 rotatably coupled, two coupling portions 33 coupling the first member 31 and the second member 32, and an operation portion 313 for operation to rotate the first member 31 and the second member 32.

[0070] Figure 5A is a side view of the first member 31, Figure 5B is a plan view of the first member 31. As shown in Figure 5A and Figure 5B , the first member 31 has a front side end portion 311 curved in a hook shape as viewed from the side, an upper plate portion 310 extending and spreading from the upper side of the front side end portion 311 toward the back side, and two first side plate portions 312 extending and spreading from the side of the front side end portion 311 toward 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. At the end of the back side of the upper plate portion 310, a hole 315 into which an insertion portion 132 of the torsion coil spring 1 is inserted is formed.

[0071] The operation portion 313 is provided on the back side of the outer surface of the upper plate portion 310. As shown in Figure 5B , the operation portion 313 covers a range including the hole 315 on the outer surface of the upper plate portion 310 as viewed in the direction in which the hole 315 penetrates. In addition, as shown in Figure 7A and Figure 7B described later, the operation portion 313 can also cover a range including the insertion portion 132 protruding from the hole 315. In Figure 5A ​In the example of FIG, 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.

[0072] The two first side plate portions 312 of the first member 31 are each formed with a connection hole 314. A protrusion 324 of the second member 32, which will be described later, is inserted into the connection hole 314.

[0073] Figure 5C shows a side view of the second component 32, Figure 5D : represents a top view of the second component 32. Figure 5C and Figure 5D As shown, the second member 32 includes a front end portion 321 that curves into a hook shape when viewed from the side; a bottom plate portion 320 that extends and expands from the bottom side of the front end portion 321 toward the back side; two second side plates 322 that extend and expand from the side surfaces of the front end portion 321 toward the back side; and a mounting portion 323 provided at the back end of the bottom plate portion 320. The two second side plates 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.

[0074] The two second side plates 322 of the second component 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 component 31 and the second component 32 are connected around the rotation center line Lr ( Figure 6B ) are connected so as to rotate freely.

[0075] like Figure 5D As shown, 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.

[0076] Figure 6A Shows a side view of the fastener 3, Figure 6B A top view of the fastener 3 is shown. Figure 7A 1 shows a cross-sectional view showing the internal structure of the fastener 3, Figure 7BA rear view of the fastener 3 is shown. When the fastener 3 is in the closed state, the front side end portion 311 of the first member 31 abuts against the front side end portion 321 of the second member 32, as shown by the first member 31 and the second member 32 forming a closed space 30 that surrounds the periphery. When the fastener 3 is in the open state, as shown, a gap is created between the front side end portion 311 and the front side end portion 321, enabling the ring member 41 to enter and exit the closed space 30. As shown, in the case of connecting the fastener 3 to the ring member 41 of the wire member 4A, the fastener 3 is brought to the open state, the ring member 41 is hooked to the front side end portion 321 that is curved in a hook shape, and the fastener 3 is brought to the closed state. Thereby, the ring member 41 is brought to a state of being inserted into the closed space 30 and is made unable to escape from the closed space. In the case of detaching the fastener 3 from the ring member 41, the fastener 3 is brought to the open state, the ring member 41 is taken out from the gap between the front side end portion 311 and the front side end portion 321, and the fastener 3 is brought to the closed state. Figure 6A Figure 4B Figure 4A

[0077] The first member 31 and the second member 32 are urged in a manner of relatively rotating in a direction in which the closed state is attained by the elastic force of the torsion coil spring 1. In the case of bringing the first member 31 and the second member 32 from the closed state to the open state, the operation portion 313 provided to the first member 31 is abutted against with a finger or the like and a force is applied, and the first member 31 and the second member 32 are relatively rotated against the force of the torsion coil spring 1. When the force applied to the operation portion 313 is released, the first member 31 and the second member 32 automatically return to the closed state.

[0078] Figure 7A Figure 7B As shown, the torsion coil spring 1 is disposed in the space inside the fastener 3 (the space surrounded by the first member 31 and the second member 32) in a state in which the insertion portion 132 is inserted into the hole 315 of the first member 31 and the engagement portion 142 is engaged with the step portions 325a, 325b of the recessed portion 325 of the second member 32. At least a portion of the torsion coil spring 1 (a portion including the coil portion 12 in the example of the drawing) is positioned between the two first side plate portions 312 and between the two second side plate portions 322. The center line Lc of the coil portion 12 of the torsion coil spring 1 is substantially parallel with respect to the rotation center line Lr. Figure 6B

[0079] According to the present embodiment, as with the first embodiment, the torsion coil spring 1 is disposed inside the first member 31 and the second member 32 in a manner in which the center line Lc of the coil portion 12 is parallel with the rotation center line Lr. Figure 3 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 Figure 10 Compared to the conventional torsion coil spring 600 shown in FIG. , the spring is closer to the direction perpendicular to the rotation centerline Lr. Therefore, a reduction in the rotational force acting on the first and second members 31, 32 can be effectively suppressed. Furthermore, since the wasted force acting on the connecting portion 33 is reduced, a reduction in durability can be suppressed.

[0080] According to this embodiment, on the outer surface of the first component 31 viewed 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 ( Figure 7A 、 Figure 7B Thus, in addition to its original function of easily rotating the first and second components 31 and 32 with a finger or the like, the operating portion 313 also functions to prevent a finger or other object from contacting the insertion portion 132 protruding from the hole 315. Therefore, the structure of the fastener 3 can be simplified compared to a case where another component is provided to prevent contact with the insertion portion 132.

[0081] According to this embodiment, Figure 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. Figure 10 As shown, the shaft of the rotating shaft is inserted into the coil portion 12, and the torsion coil spring 1 is not easily detached from the first member 31 and the second member 32. In addition, the second arm portion 14 is retained on the second member 32 by the engagement of the engaging portion 142 of the second arm portion 14 with the stepped portions 325a, 325b of the second member 32. Therefore, the arms of the torsion coil spring 1 can be easily attached to the first member 31 and the second member 32.

[0082] 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. Figure 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, the engagement portion 142 extends in parallel with respect to the center line Lc as viewed from the second direction D2. Therefore, in the case where the first member 21 and the second member 22 are rotated around the rotation center line Lr, the stepped portions 325a, 325b of the second member 32 remain parallel to the engagement portion 142, and thus disengagement of these is not easily caused.

[0083] According to the present embodiment, as Figure 6B and Figure 7B shown, one first side plate portion 312 and one second side plate portion 322 are connected by one connecting portion 33, and the other first side plate portion 312 and the other second side plate portion 322 are connected by the other connecting portion 33. Further, at least a portion of the torsion coil spring 1 is positioned between the two first side plate portions 212 of the first member 21, and between the two second side plate portions 222 of the second member 22. Thus, compared to a structure in which the shaft 800 is inserted through the coil portion 603 as shown in Figure 10 , the first member 31 and the second member 32 can be simply combined with the torsion coil spring 1.

[0084] Next, a manufacturing method of the above-described torsion coil spring 1 according to the present embodiment will be described.

[0085] Figure 8A is a flowchart for explaining an example of the manufacturing method of the torsion coil spring 1. In Figure 8A the manufacturing method shown, first, the coil portion 12 is formed by winding the wire 10 in a spiral shape (ST100). Next, the first arm portion 13 and the second arm portion 14 are formed so as to extend from the first end portion 121 and the second end portion 122 of the coil portion 12, respectively (ST105).

[0086] Figure 8B is a flowchart for explaining an example of the procedure (ST105: Figure 8A ) of forming the first arm portion 13 and the second arm portion 14.

[0087] ST200:

[0088] The procedure of forming the first arm portion 13 includes a procedure (first bending procedure) of bending the wire 10 extending from the first end portion 121 of the coil portion 12 at the first bending portion 133.

[0089] In the first bending procedure, as shown in Figure 2A , the wire 10 extending from the first end portion 121 is bent at the first bending portion 133 so as to become a portion of the insertion portion 132 that, as viewed from the center line direction Dc, 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 a side on which the coil hole 120 is provided with respect to the first tangent line Lt1. Further, in the first bending procedure, as shown inFigure 2B As shown in FIG. 12, the wire 10 extending from the first end portion 121 is bent at the first bending portion 133 so as to extend in a direction in which the portion of the insertion portion 132, as viewed in the first direction Dl, moves away from the first perpendicular line Lpl as it moves away from the first bending portion 133, toward a direction in which the coil portion 12 is disposed on a side opposite to the first perpendicular line Lpl.

[0090] ST205:

[0091] The procedure of forming the second arm portion 14 includes a procedure (second bending procedure) of bending the wire 10 extending from the second end portion 122 of the coil portion 12 at the second bending portion 134.

[0092] In this second bending procedure, as shown in FIG. 13, the wire 10 extending from the second end portion 122 is bent at the second bending portion 134 so as to extend in parallel with the center line Lc in a direction in which the portion of the engagement portion 142, as viewed in the second direction D2, moves away from the second perpendicular line Lp2 as it moves away from the second bending portion 134, toward a direction in which the coil portion 12 is disposed on a side opposite to the second perpendicular line Lp2. Figure 2C

[0093] Further, the order of the first bending procedure of the step ST200 and the second bending procedure of the step ST205 can be reversed, or these procedures can be performed simultaneously. In addition, each procedure of the above-described manufacturing method of the torsion coil spring 1 can be performed manually, or at least a part of the procedures can be performed using a machine tool.

[0094] Next, a manufacturing method of a fastener 3 using the above-described torsion coil spring 1 according to the present embodiment will be described.

[0095] In this manufacturing method of the fastener 3, first, the above-described torsion coil spring 1 is prepared. The torsion coil spring 1 can be manufactured, for example, by the method shown in FIG. 10. Figure 8A Figure 8B

[0096] In addition, in this manufacturing method, a first member 31 and a second member 32 that are rotatably coupled are prepared. The first member 31 (FIG. 15) and the second member 32 (FIG. 16) are manufactured, for example, by press working or the like. As shown in FIG. 17, the first member 31 and the second member 32 are assembled in a state of being rotatably coupled by inserting the two protruding portions 324 of the second member 32 into the two coupling holes 314 of the first member 31, respectively. Figure 5A Figure 5B Figure 5C Figure 5D As shown in FIG. 17, the first member 31 and the second member 32 are assembled in a state of being rotatably coupled by inserting the two protruding portions 324 of the second member 32 into the two coupling holes 314 of the first member 31, respectively. Figure 9A

[0097] ​​​​​​​Next, the torsion coil spring 1 is mounted with respect to the first member 31 and the second member 32 which are rotatably coupled. That is, the torsion coil spring 1 is pressed between the first member 31 and the second member 32 until the insertion portion 132 enters the hole 315 of the first member 31 and the engagement portion 142 engages with the stepped portions 325a, 325b of the second member 32, with the insertion portion 132 abutting against the first member 31 and the engagement portion 142 abutting against the second member 32. For example, as shown in FIG. 3, the torsion coil spring 1 is pressed into the first member 31 and the second member 32 from the opening portion formed in the back surface side of the coupled first member 31 and second member 32. By the elastic force of the torsion coil spring 1, a strong force to insert the insertion portion 132 into the hole 315 of the first member 31 and a strong force to engage the engagement portion 142 with the stepped portions 325a, 325b of the second member 32 are generated, so that the torsion coil spring 1 becomes a state of being firmly mounted to the first member 31 and the second member 32 and is not easily detached. Figure 9B

[0098] The above-described embodiment is an example, and the present embodiment further includes various modifications.

[0099] For example, in the torsion coil spring of the present embodiment, the number of windings 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 as viewed from each direction, the length of each straight portion of the arm portion as viewed from each direction, the bending angle of each straight portion of the arm portion as viewed from each direction, the angle formed by the straight portions of the two arm portions with respect to each other, and the like are not limited to the examples shown in Figures 1A-1B Figures 2A-2C

[0100] Figures 6A-6B Figures 7A-7B The fastener 3 for accessories shown in FIGS. 1 to 3 is a finished product which is assembled, but the present embodiment is not limited to these examples. That is, assembly components for assembling the fastener for accessories are also included in the present embodiment. Figures 6A-6B Figures 7A-7B The assembly component of the fastener 3 for accessories shown in FIGS. 1 to 3 has the first member 31 and the second member 32 and the torsion coil spring 1 as the biasing member.

[0101] In addition, the torsion coil spring according to the present embodiment is not limited to the fastener for accessories, and can be applied to various devices and the like, and is particularly suitable for devices and the like which require miniaturization.​​​​​

Claims

1. A torsion coil spring that generates a force causing 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 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 the second end portion of the coil portion, The first arm comprises: an inserting 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: an engaging portion engaged with the 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, which 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 portion is located behind the center line when viewed from a first direction perpendicular to the center line. The second end portion 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, it is connected to a first perpendicular line perpendicular to the center line, and extends in a direction away from the center line as it moves away from the first end. The insertion portion extends in a direction away from the first tangent line as it moves away from the first bent portion, as viewed from the center line, toward a side opposite to the side where the coil hole is provided with respect to the first tangent line. When viewed from the first direction, the coil extends in a direction away from the first perpendicular line as the coil moves away from the first bent portion, toward a side where the coil portion is provided relative to the first perpendicular line. 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, it is connected to a second perpendicular line perpendicular to the center line and extends in a direction away from the center line as it moves away from the second end. The engaging portion extends parallel to the center line in a direction away from the second perpendicular line as the engaging portion moves away from the second bent portion, toward a side where the coil portion is provided relative to the second perpendicular line, as viewed from the second direction.

2. The torsion coil spring according to claim 1, wherein 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, wherein 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, wherein The angle formed by the first tangent line and the second tangent line toward the coil hole is an acute angle.

5. A fastener for jewelry, 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 4 generates a force causing the first member and the second member to rotate relative to each other.

6. The fastener for accessories according to claim 5, characterized in that: The first component and the second component are capable of relative rotation around a rotation center line. The center line of the torsion coil spring is parallel to the rotation center line.

7. The fastener for accessories according to claim 5, characterized in that: It has two connecting parts that 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 on the other side and the second side plate portion on 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.

8. The fastener for accessories according to claim 5, characterized in that: An operating portion is provided on the outer surface of the first component, and the operating portion is used to operate the first component to 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 along a penetrating direction of the hole.

9. An ornament, characterized in that: A fastener for accessories according to claim 5.

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