Spring connector

Abstract

A spring connector (10) comprises: a tube (3); a movable pin (5) with a top end protruding from the opening of the tube and having a hole opening to the opposite side in the protruding direction; and a helical spring (7) that applies force to the movable pin in the protruding direction. The helical spring has an eccentric winding portion (751a), the winding center of which is eccentric relative to the axis that connects the winding center of the winding portion at one end (711) and the winding center of the winding portion at the other end (731).

Description

Technical Field

[0001] This invention relates to spring connectors. Background Technology

[0002] Figure 13 This diagram shows a structural example of a conventional spring connector 100, and is a cross-sectional view of the tube 30, movable pin 50, and helical spring 70 after longitudinally cutting the spring connector 100. Additionally, Figure 14 This diagram illustrates the structure of the helical spring 70 in its free state after being removed from the spring connector 100. It is a cross-sectional view of the end of the helical spring 70 that abuts against the bottom of the tube 30. Figure 13 As shown, the spring connector 100 includes a tube 30 with a bottom, a movable pin 50, and a coil spring 70. The top end 501 of the movable pin 50 protrudes from the opening of the tube 30 and has a hole 503 opening to the opposite side in the protruding direction. One end of the coil spring 70 abuts against the bottom of the tube 30, and the other end abuts against the bottom of the hole 503, applying force to the movable pin 50 in the protruding direction.

[0003] The helical spring 70 has multiple winding portions 701 (701a, 701b). For example... Figure 14 As shown, the winding portion 701a at one end, which abuts against the bottom of the tube 30, has a larger diameter compared to the other winding portions 701b. The winding portion 701a is configured such that, in its free state, it is eccentrically positioned relative to the winding center (shown as a dashed line) of the other winding portions 701b, relative to the winding center (shown as a dashed line) of the winding portion 701a at one end. On the other hand, as... Figure 13 As shown, the inner diameter of the tube 30 is large enough to accommodate the large-diameter winding portion 701a. However, the inner diameter of the hole in the movable pin 50 is insufficient to accommodate the large-diameter winding portion 701a; only the winding portion 701b can be inserted. Furthermore, the bottom center of the tube 30 and the bottom center of the hole 503 in the movable pin 50 are located on the central axis of the spring connector 100. Therefore, the winding portion 701b of the helical spring 70 housed within the spring connector 100 is positioned off-center from the central axis near one end. Conversely, the winding portion 701b near the other end, which abuts against the bottom of the hole 503, is on or close to the central axis. The helical spring 70 is housed within the spring connector 100 in a curved shape where the winding centers of each winding portion 701 are gradually offset.

[0004] When using the spring connector 100, the top end 501 is pushed, and the movable pin 50 is pushed into the tube 30. Thus, in Figure 13A radial force, indicated by arrow A5, applies, pressing the outer circumferential surface of the movable pin 50 against the inner circumferential surface of the tube 30. The direction of the applied force (the direction of arrow A5) is the direction in which the winding center of the winding portion 701b is eccentric relative to the winding center of the winding portion 701a, and is the direction in which the helical spring 70, housed within the spring connector 100, bends. Therefore, the tube 30 and the movable pin 50 can be brought into contact and connected during use, thereby achieving a stable electrical connection between them. Such a conventional structure is disclosed in Patent Document 1.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Utility Model Application Publication No. 4-105462 Summary of the Invention

[0008] However, in the conventional spring connector 100, the winding portion 701a at one end is set to have a larger diameter, and the winding portion 701b other than the winding portion 701a is eccentrically arranged relative to the winding portion 701a. Therefore, the winding portion 701b at the end closer to the winding portion 701a is located inside the tube 30 and is also located close to the inner circumferential surface of the tube 30. When the top end portion 501 is pushed and the movable pin 50 is pushed into the tube 30 for use, along Figure 13 The force acts in the direction of arrow A5. Due to this force (arrow A5), in Figure 13 The problem occurs in the section enclosed by the dotted line. The winding portion 701b, located at the end closest to the winding portion 701a, is situated behind the rear end face 505 of the movable pin 50 (in the direction it is pushed in during use). Depending on the length and travel distance of the movable pin 50, the winding portions 701a and 701b at one end may obstruct the movement of the movable pin 50 in the backward direction. Consequently, this may impair the stability of the contact between the movable pin 50 and the tube 30.

[0009] One example of the object of the present invention is to provide a technique that can improve the contact stability between the movable pin and the tube.

[0010] One aspect of the present invention is a spring connector comprising: a tube; a movable pin having a top end protruding from an opening in the tube and having a hole opening to the opposite side in the protrusion direction; and a helical spring that applies force to the movable pin in the protrusion direction, the helical spring having an eccentric winding portion whose winding center is eccentric relative to the axis connecting the winding center of one end of the winding portion and the winding center of the other end of the winding portion. Attached Figure Description

[0011] Figure 1 This is a diagram showing a structural example of the spring connector according to the first embodiment.

[0012] Figure 2 Other figures show a structural example of the spring connector of the first embodiment.

[0013] Figure 3 This is an explanatory diagram illustrating the structure of a helical spring.

[0014] Figure 4 This is an explanatory diagram illustrating the positional conditions of one end.

[0015] Figure 5 This is a diagram showing a structural example of the spring connector according to the second embodiment.

[0016] Figure 6 Other figures show a structural example of the spring connector of the second embodiment.

[0017] Figure 7 This is a diagram showing the structure of the helical spring in a modified spring connector.

[0018] Figure 8 This is a diagram showing the structure of the helical spring in other variations of the spring connector.

[0019] Figure 9 This is a diagram showing the structure of the helical spring in other variations of the spring connector.

[0020] Figure 10 This is a diagram showing the structure of the helical spring in other variations of the spring connector.

[0021] Figure 11 This is a diagram showing the structure of the helical spring in other variations of the spring connector.

[0022] Figure 12 This is a diagram showing the structure of the helical spring in other variations of the spring connector.

[0023] Figure 13 This is a diagram showing a structural example of a conventional spring connector.

[0024] Figure 14 This is an explanation Figure 13 A diagram illustrating the structure of the helical spring in the spring connector. Detailed Implementation

[0025] Preferred embodiments of the present invention will be described with reference to the accompanying drawings. Furthermore, the present invention is not limited to the embodiments described below, and the ways in which the present invention can be applied are not limited to the following embodiments. In the accompanying drawings, the same reference numerals are used to denote the same parts.

[0026] The helical spring of this embodiment is configured such that it has an eccentric winding portion in the effective number of turns between its two ends. The eccentric winding portion refers to a portion where the winding center is eccentric relative to the axis connecting the winding centers of the two ends. According to this structure, when the top end is pushed and the movable pin is pushed into the tube, a force pressing the movable pin against the tube acts at least through the eccentric winding portion. Therefore, during use, the movable pin and the tube can reliably contact, thereby achieving a stable electrical connection between the movable pin and the tube. On the other hand, the winding portion at one end of the helical spring does not obstruct the movement of the movable pin. Therefore, the range of motion of the movable pin during use can be expanded, and correspondingly, the overall length of the spring connector can be shortened. Furthermore, it is possible to improve the contact stability between the movable pin and the tube.

[0027] [First Embodiment]

[0028] Figure 1 and Figure 2 This is a diagram showing a structural example of the spring connector 10 in the first embodiment. Figure 1 and Figure 2 The diagram shows the tube 3 and movable pin 5 cut in a longitudinal direction with the spring connector 10, and the cross-section of the tube 3 and movable pin 5 is shown, while the side view of the coil spring 7 is shown. Figure 1 The movable pin 5 is shown in its protruding state (protruding state). Figure 2 This shows the state where the top part 511 of the movable pin 5 is pushed back into the tube 3 (retracted state). Figure 1 and Figure 2 As shown, the spring connector 10 of the first embodiment includes a tube 3 with a bottom, a movable pin 5, and a coil spring 7. The top end 511 of the movable pin 5 protrudes from the opening of the tube 3. The coil spring 7 applies force to the movable pin 5 in the protruding direction.

[0029] The tube 3 is a bottomed cylindrical body made of a conductive material (such as copper or copper alloy), and the movable pin 5 can be slidably held at the other end of the opening. The open end of the tube 3 is bent inward by a tapering process to form a locking part 31 to prevent the movable pin 5 from falling off.

[0030] The movable pin 5 is made of a conductive material (such as copper or a copper alloy). The movable pin 5 consists of a small-diameter portion 51 and a large-diameter portion 53 with an outer diameter larger than the small-diameter portion 51, and has a hole 55 opening to the opposite side (one end side) in the protruding direction. The inner diameters of the small-diameter portion 51 and the large-diameter portion 53 are the same. The hole 55, which fixes the inner diameter, is divided by the inner circumferential surfaces of the small-diameter portion 51 and the large-diameter portion 53. The tip portion 511, which is the tip of the small-diameter portion 51, becomes a contact portion that contacts the terminal of the contact object. The small-diameter portion 51 and the large-diameter portion 53 are connected with a layered difference in their outer diameters, and the beveled layered difference surface 57 between them abuts against the locking portion 31 of the tube 3, forming a structure that prevents the movable pin 5 from falling out of the tube 3. Therefore, even when the small-diameter portion 51 protrudes from the tube 3, the large-diameter portion 53 remains inside the tube 3.

[0031] The helical spring 7 is a helical spring in which the wound portions at both ends 711 and 731 form a support coil with both ends closed. The helical spring 7 is made of, for example, piano wire or stainless steel wire. In addition, the helical spring 7 can also be made of insulating material, or it can be a spring covered with an insulating film. One end 711 of the helical spring 7 abuts against the bottom of the tube 3, and the other end 731 abuts against the bottom of the hole 55, applying force to the movable pin 5 in the protruding direction.

[0032] Figure 3 This is an explanatory diagram illustrating the structure of the helical spring 7. Figure 3 From Figure 1 The spring connector 10 in the protruding state shown is only partially extended from the helical spring 7 in the side view. (See attached image.) Figure 3 As shown, the helical spring 7 is composed of a support coil portion 71 at one end 711, a support coil portion 73 at the other end 731, and an effective coil portion 75 between the one end 711 and the other end 731. Hereinafter, the support coil portion 71 will be appropriately referred to as the "one-end support coil portion". Hereinafter, the support coil portion 73 will be appropriately referred to as the "other-end support coil portion".

[0033] The effective number of turns portion 75 has a plurality of winding portions 751 (751a, 751b). A portion corresponding to one pitch L2 corresponds to one winding portion 751. The winding portion 751 of the effective number of turns portion 75 includes an eccentric winding portion 751a whose winding center is eccentrically offset relative to the straight axis L1 connecting the winding centers of one end support coil portion 71 and the other end support coil portion 73. That is, the effective number of turns portion 75 has this eccentric winding portion 751a and a winding portion 751b whose winding center is on the straight axis L1 without eccentricity. Hereinafter, the winding portion 751b will be appropriately referred to as a "non-eccentric winding portion". In the first embodiment, one of the winding portions 751 of the effective number of turns portion 75 is provided as an eccentric winding portion 751a. Although the eccentric winding portion 751a is... Figure 1 and Figure 2The center is located inside the hole 55, but it can also be located outside the hole 55. In this case, when the coil spring 7 itself is pushed and bent, a portion of the winding portion 751b located inside the hole 55 pushes the inner side of the pin and applies lateral pressure.

[0034] The outer diameter of the eccentric winding portion 751a is set to be smaller than the outer diameter of the winding portion 751 (non-eccentric winding portion 751b) adjacent to it. In the first embodiment, all non-eccentric winding portions 751b are set to the same outer diameter, and the outer diameter of the eccentric winding portion 751a is determined as a smaller outer diameter. Furthermore, in this embodiment, the eccentric winding portion 751a is provided at approximately the center of the entire length of the helical spring 7 or at approximately the center of the effective number of turns portion 75, but the location is not limited to this.

[0035] The outer diameter of one end support ring portion 71 is set to be smaller than the outer diameter of the winding portion 751 (non-eccentric winding portion 751b) adjacent to one end support ring portion 71. The outer diameter of the other end support ring portion 73 is set to be smaller than the outer diameter of the winding portion 751 (non-eccentric winding portion 751b) adjacent to the other end support ring portion 73. In the first embodiment, one end support ring portion 71 and the other end support ring portion 73 are set to have the same outer diameter, which is set to be smaller than the outer diameter of the non-eccentric winding portion 751b.

[0036] One end 711 and the other end 731 are configured to be positions that satisfy the specified position conditions. Figure 4 This is an explanatory diagram illustrating the positional conditions of one end 711. Figure 4 Schematic illustration of from Figure 3 The positional relationship between the end support ring 71 and the eccentric winding portion 751a is observed from a top view along the straight line L1 of the axis. The winding of the end support ring 71 and the eccentric winding portion 751a is shown as a circle, and the end 711 is designated P35 and shown as a large black circle. From this top view, the position of the axis L1 corresponds to the center of the end support ring 71. Figure 4 The base point P31 is shown as a black circle. In this top view, the position of one end 711 is determined based on the line (reference line) L31 from the base point P31 (showing the position of the axis line L1) toward the winding center P33 of the eccentric winding portion 751a. Specifically, the position of one end 711 is set such that the angle between the reference line L31 and the line from the base point P31 toward the end 711 is between 90 degrees and 270 degrees clockwise in this top view. That is, the position of one end 711 is such that it is relative to the eccentric winding portion 751a... Figure 4 The eccentricity indicated by the arrow is more than 90 degrees away from the center. Figure 4 The method used to determine the angle range indicated by the shading is as follows. For example, in Figure 1 and Figure 2 In the example shown, the positions of one end 711 and the other end 731 are determined such that they form a position P35 with an angle of 180 degrees relative to the reference line L31. Position P35 can also be described as a position 180 degrees away from the eccentric orientation.

[0037] The position of the other end 731 is determined in the same way. That is, a reference line is set from the base point showing the position of the axis line L1 toward the winding center of the eccentric winding portion 751a in a top view of the other end 731 viewed from the straight direction of the axis line L1. Furthermore, the position of the other end 731 is defined as a position where the angle between this reference line and the line from the base point toward the other end 731 is more than 90 degrees and less than 270 degrees clockwise in this top view.

[0038] This describes the effect related to the positions of one end 711 and the other end 731. When the top end 511 of the movable pin 5 is pushed and the coil spring 7 contracts, the coil spring 7 generates a restoring force due to its elasticity. The origin of this restoring force is one end 711 and the other end 731 of the coil spring 7. For example... Figure 4 As shown, the positions of one end 711 and the other end 731 relative to the eccentric winding portion 751a are... Figure 4 The eccentric orientation, indicated by the arrow, is more than 90 degrees away from the center, which, in this top view, is more than 90 degrees clockwise and less than 270 degrees. Therefore, through the springback force generated starting from the positions of one end 711 and the other end 731, the eccentric winding portion 751a is directed towards... Figure 2 The direction (eccentric direction) of arrow A1 in the diagram affects the movement of the arrow.

[0039] By positioning one end 711 and the other end 731 relative to the eccentric winding portion 751a as described above, the helical spring 7 can be reliably bent.

[0040] When using spring connector 10, it plays a role Figure 2 That's the effect. When the terminal of the contact object is pressed against the top part 511 during use, the movable pin 5 moves in the backward direction and the coil spring 7 contracts. Thus, as... Figure 2 As shown, the helical spring 7 bends in the eccentric winding portion 751a in its eccentric direction. The eccentric direction is... Figure 2 The direction indicated by arrow A1 is the direction in which the winding center of the eccentric winding section 751a is eccentric relative to the axis line L1. Figure 4The diagram shows a top view from the base point P31 toward the winding center P33. An eccentric force (radial, indicated by arrow A1) acts, pressing the outer peripheral surface of the movable pin 5 (the outer peripheral portion of the hole 55) against the inner peripheral surface of the tube 3. Therefore, during use, the movable pin 5 and the tube 3 can reliably contact, thereby achieving a stable electrical connection between the movable pin 5 and the tube 3. Even when the helical spring 7 is retracted, the area behind the rear end face 531 of the movable pin 5 (in the direction the movable pin 5 is pushed in) remains empty. Therefore, one end of the helical spring 7 does not impede the movement of the movable pin 5 in the backward direction. Thus, a technique can be provided that improves contact stability in the spring connector 10 without hindering the movement of the movable pin 5 during use.

[0041] [Second Implementation]

[0042] Figure 5 and Figure 6 This is a diagram showing a structural example of the spring connector 10a in the second embodiment. Figure 5 and Figure 6 The diagram shows the tube 3 and movable pin 5 cut in a longitudinal direction with the spring connector 10a, and the cross-section of the tube 3 and movable pin 5 is shown, while the side view of the coil spring 7a is shown. Figure 5 The protruding state of movable pin 5 is shown. Figure 6 The retracted state of movable pin 5 is shown. (Example) Figure 5 and Figure 6 As shown, the spring connector 10a of the second embodiment, like that of the first embodiment, includes a tube 3 with a bottom, a movable pin 5, and a coil spring 7a. The top end 511 of the movable pin 5 protrudes from the opening of the tube 3 and has a hole 55 opening to the opposite side in the protruding direction. One end of the coil spring 7a abuts against the bottom of the tube 3, and the other end abuts against the bottom of the hole 55, applying force to the movable pin 5 in the protruding direction.

[0043] In the second embodiment, the coil spring 7a has a structure in which the winding center of each winding portion 751, which constitutes the effective number of turns, gradually shifts as it approaches the eccentric winding portion 751a. Specifically, in Figure 5 or Figure 6 In this example, the winding portion 751 located inside the hole 55, and the winding portion 751 near the center, corresponds to the eccentric winding portion 751a. Each winding portion 751 other than the eccentric winding portion 751a is configured such that the winding center is displaced in a stepped manner from both ends toward the eccentric direction of the eccentric winding portion 751a. Thus, the helical spring 7a as a whole has a shape that bends in the eccentric direction along its length.

[0044] In the spring connector 10a of this structure, when the top end 511 is pushed and the movable pin 5 is pushed into the tube 3 during use, the eccentric direction of the eccentric winding portion 751a is as follows: Figure 6 A radial force is applied, as indicated by arrow A4. Consequently, the eccentric position of the eccentric winding portion 751a moves further in the eccentric direction, causing the helical spring 7a to bend. The wound portion of the eccentric winding portion 751a presses against the inner circumferential surface of the hole portion 55, pressing the outer circumferential surface of the movable pin 5 against the inner circumferential surface of the tube 3. Therefore, the same effect as in the first embodiment can be achieved.

[0045] The above describes two implementation methods, but the application of this invention is not limited to the above implementation methods, and structural elements can be added, omitted, or modified as appropriate.

[0046] For example, the configuration of the eccentric winding portion 751a in the effective number of coils portion 75 of the helical spring is not limited to the configuration illustrated in the above embodiments. Figures 7-12 These are diagrams showing the structures of the helical springs 7b, 7c, 7d, 7e, 7f, and 7g in the modified spring connectors, respectively.

[0047] For example, such as Figure 7 As shown, it can also be configured such that the effective number of turns portion 75 has a structure with multiple eccentric winding portions 751a. Figure 7 In the example, there are three eccentric winding portions 751a. Thus, it is possible to realize a helical spring 7b having multiple eccentric winding portions 751a in the effective number of turns portion 75.

[0048] like Figure 8 As shown, the non-eccentric winding portion 751b and the eccentric winding portion 751a can also be alternately configured to form the effective number of turns portion 75. Figure 8 The diagram shows a structural example of an effective number of turns portion 75 in which the non-eccentric winding portion 751b and the eccentric winding portion 751a are arranged alternately in pairs. Alternatively, the non-eccentric winding portion 751b and the eccentric winding portion 751a can be arranged one-to-one. Thus, a helical spring 7c in which the non-eccentric winding portion 751b and the eccentric winding portion 751a are arranged alternately in the effective number of turns portion 75 can be realized.

[0049] like Figure 9 As shown, the eccentric winding portion 751a in the effective number of turns portion 75 can also be arranged irregularly. Therefore, it is possible to realize a helical spring 7d in which the eccentric winding portion 751a is arranged irregularly in the effective number of turns portion 75.

[0050] like Figure 10 As shown, the effective number of turns section 75 can also be configured to have a non-eccentric winding section 751c in addition to the non-eccentric winding section 751b and the eccentric winding section 751a. The non-eccentric winding section 751c is a top view of one end 711 or the other end 731 of the coil spring viewed from the straight direction of the axis line L1 (see reference). Figure 4 The winding portion having a winding center in a direction different from the direction from the base point at the position of the shown axis straight line L1 toward the winding center of the eccentric winding portion 751a. More specifically, in this top view, the winding portion having a winding center at a position where the angle between the line (reference line) L31 and the line from the base point P31 toward the winding center of the eccentric winding portion 751c is less than 90 degrees is the eccentric winding portion 751c. The line (reference line) L31 is the line from the base point P31 at the position of the shown axis straight line L1 toward the winding center P33 of the eccentric winding portion 751a. Figure 10 In the example, the effective number of turns portion 75 includes a heterogeneous eccentric winding portion 751c having a winding center in a direction opposite to the direction from the base point toward the winding center of the eccentric winding portion 751a. Thus, it is possible to realize a helical spring 7e having a heterogeneous eccentric winding portion 751c in the effective number of turns portion 75 that is eccentric relative to the axial straight line L1 in a direction different from the direction where the eccentric winding portion 751a is located.

[0051] like Figure 11 As shown, the pitch of the helical spring 7f can also be unequal. Specifically, for example, the pitch L32 of the eccentric winding portion 751a can be made narrower than the pitch L33 of the non-eccentric winding portion 751b. Conversely, the pitch L32 of the eccentric winding portion 751a can be made wider than the pitch L33 of the non-eccentric winding portion 751b. Thus, a spring connector can be constructed using helical springs 7f with unequal pitch intervals.

[0052] Alternatively, the structure can be configured to include winding portions of different outer diameters within the effective number of coils of the helical spring. For example, as... Figure 12 As shown, in the structure of a helical spring in which the winding center of each winding portion 751 of the effective number of turns portion 75 shown in the second embodiment gradually shifts as it approaches the eccentric winding portion 751a, the outer diameter of each winding portion 751 is also set to gradually decrease as it approaches the eccentric winding portion 751a. Therefore, it is possible to realize a helical spring 7g with winding portions 751 having different outer diameters in the effective number of turns portion 75.

[0053] Furthermore, in the above embodiments and modifications, a helical spring with its two ends closed at the winding portion being a support ring portion is illustrated. However, a helical spring with open ends can also be used. A closed end refers to a winding method in which the ends are in a state where the spring wires are not spaced apart. An open end refers to a winding method in which the ends are in a state where the spring wires are spaced apart.

[0054] Furthermore, the cross-sectional shape (wire cross-sectional shape) of the helical spring constituting the spring connector is not particularly limited; for example, it can be circular, elliptical, polygonal, etc. Additionally, the winding shape of a winding section ( Figure 4 The shape (from a top view) is not limited to a circle; for example, it can be a rectangle, an ellipse, or other shapes.

[0055] Several implementation methods and their variations are described. These inventions can be summarized as follows.

[0056] The present invention provides a spring connector comprising: a tube; a movable pin having a top end protruding from an opening in the tube and having a hole opening to the opposite side in the protrusion direction; and a helical spring that applies force to the movable pin in the protrusion direction, the helical spring having an eccentric winding portion whose winding center is eccentric relative to the axis connecting the winding center of one end of the winding portion and the winding center of the other end of the winding portion.

[0057] According to the present invention, the helical spring is configured with an eccentrically wound portion having a winding center that is eccentrically offset from the axis connecting the winding centers of the two end winding portions. According to this structure, when the top end is pushed and the movable pin is pushed into the tube, at least through the eccentrically wound portion, a force is applied to press the movable pin against the tube. Therefore, reliable contact between the movable pin and the tube can be achieved during use, thereby realizing a stable electrical connection between the movable pin and the tube. On the other hand, the situation where the winding portion at one end of the helical spring obstructs the movement of the movable pin is suppressed. Therefore, the range of movement of the movable pin during use can be expanded, and correspondingly, the overall length of the spring connector can be shortened. Furthermore, the contact stability between the movable pin and the tube can be improved.

[0058] Alternatively, the aforementioned end point, viewed from a straight line along the aforementioned axis, is positioned where the angle between the line from the base point showing the position of the axis toward the winding center of the eccentric winding portion and the line from the base point toward the aforementioned end point is between 90 degrees and 270 degrees clockwise.

[0059] The other end, in the above top view, is located at a position where the angle between the line from the base point toward the winding center of the eccentric winding portion and the line from the base point toward the other end is more than 90 degrees clockwise and less than 270 degrees clockwise.

[0060] Alternatively, the two ends of the aforementioned helical spring can be closed.

[0061] Alternatively, the outer diameter of the support coil portion at one end of the aforementioned helical spring may be smaller than the outer diameter of the winding portion adjacent to the support coil portion, and the outer diameter of the support coil portion at the other end may be smaller than the outer diameter of the winding portion adjacent to the support coil portion.

[0062] Alternatively, the eccentric winding portion may be located inside the hole.

[0063] Alternatively, the outer diameter of the eccentric winding portion may be smaller than the outer diameter of the winding portion adjacent to the eccentric winding portion.

[0064] Alternatively, the aforementioned eccentric winding portion may be located in the effective number of turns between one end and the other end.

[0065] The outer diameter of the aforementioned eccentric winding portion is smaller than the outer diameter of the winding portions other than the aforementioned eccentric winding portion in the aforementioned effective number of turns portion.

[0066] Alternatively, the aforementioned helical spring may have multiple eccentric winding portions.

[0067] Alternatively, the aforementioned helical spring may have an eccentric winding portion in the effective number of turns section, wherein the eccentric winding portion has a winding center in a direction different from the direction from the aforementioned base point toward the winding center of the eccentric winding portion in the aforementioned top view.

[0068] Alternatively, the aforementioned eccentric winding portion may be located in the effective number of turns between one end and the other end.

[0069] The winding center of each winding portion in the aforementioned effective number of turns gradually shifts as it approaches the aforementioned eccentric winding portion.

[0070] Alternatively, the aforementioned helical springs may have unequal pitch.

[0071] Explanation of reference numerals in the attached figures

[0072] 10, 10a… Spring connector

[0073] 3…pipe

[0074] 5…movable pins

[0075] 511…top part

[0076] 55…hole

[0077] 7, 7a, 7b, 7c, 7d, 7e, 7f, 7g…coil springs

[0078] 71…One end support ring

[0079] 711… one end

[0080] 73…The other end support ring

[0081] 731…the other end

[0082] 75… Valid lap count section

[0083] 751… Winding section

[0084] 751a…Eccentric winding section

[0085] 751b…Non-eccentric winding section

[0086] 751c…heterogeneous eccentric winding section.

Claims

1. A spring connector, comprising: Tube; A movable pin having a top end portion protruding from the opening of the tube and a hole portion located on the opposite side of the top end portion relative to the protruding direction of the top end portion; and A helical spring that applies force to the movable pin in the protruding direction, and a portion of which is located inside the hole. The helical spring has an eccentric winding portion, the winding center of which is eccentric relative to the axis connecting the winding centers of one end of the winding portion and the winding centers of the other end of the winding portion. The one end, viewed from a straight line along the axis, is located at a position where the angle between the line from the base point showing the position of the axis toward the winding center of the eccentric winding and the line from the base point toward the one end is approximately 180 degrees. The other end, in the top view, is located at an angle of approximately 180 degrees between the line from the base point toward the winding center of the eccentric winding portion and the line from the base point toward the other end.

2. The spring connector as claimed in claim 1, wherein, The outer diameter of the helical spring, viewed from above in a straight line from the axis, is smaller than the inner diameter of the hole.

3. The spring connector as described in claim 1 or 2, wherein, The hole is provided within the area of ​​the movable pin in the protruding state that protrudes from the tube and the area that does not protrude from the tube. One end is located in the protruding area.

4. The spring connector as claimed in claim 1 or 2, wherein, The two ends of the helical spring are closed.

5. The spring connector as claimed in claim 1 or 2, wherein, The outer diameter of the support coil portion at one end of the helical spring is smaller than the outer diameter of the winding portion adjacent to the support coil portion, and the outer diameter of the support coil portion at the other end is smaller than the outer diameter of the winding portion adjacent to the support coil portion.

6. The spring connector as claimed in claim 1 or 2, wherein, The eccentric winding portion is located inside the hole.

7. The spring connector as claimed in claim 1 or 2, wherein, The outer diameter of the eccentric winding portion is smaller than the outer diameter of the winding portion adjacent to the eccentric winding portion.

8. The spring connector as claimed in claim 1 or 2, wherein, The eccentric winding portion is located in the effective number of turns portion between one end and the other end. The outer diameter of the eccentric winding portion is smaller than the outer diameter of the winding portions other than the eccentric winding portion in the effective number of turns portion.

9. The spring connector as claimed in claim 1 or 2, wherein, The helical spring has an eccentric winding portion in the effective number of turns between one end and the other end, which is eccentric relative to the axis in a direction different from the eccentric direction of the eccentric winding portion.

10. The spring connector as claimed in claim 1 or 2, wherein, The eccentric winding portion is located in the effective number of turns portion between one end and the other end. The winding center of each winding portion of the effective number of turns gradually shifts as it approaches the eccentric winding portion.

11. The spring connector as claimed in claim 1 or 2, wherein, The helical spring has an unequal pitch.

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