Click hinge

Abstract

[Problem] To provide a click hinge excellent in use feeling by suppressing, as much as possible, rattling generated between a shaft and a member through which the shaft is inserted. [Solution] A click hinge (100) is provided with: a shaft (10); a grooved plate (20) having a recessed groove (24); a cam plate (30) having a second insertion hole (32); a stopper (40) having a third insertion hole (42); a disk spring (50); and a fixing plate (60) for energizing the stopper (40) and the cam plate (30) to the grooved plate (20) by means of the disk spring (50). The fixing plate (60) has an insertion tip end of the shaft (10) fixed thereto, and sandwiches the disk spring (50), the stopper (40), and the cam plate (30) together with the grooved plate (20). The stopper (40) and the cam plate (30) are engaged by forming a predetermined angle between the direction with respect to the second insertion hole (32) and the direction with respect to the third insertion hole (42).

Description

Click Hinge

[0001] The present invention relates to a click hinge.

[0002] There is a click hinge that rotatably connects two objects, can maintain the positioning of the two objects at a predetermined position, and generates a clicking sensation so that the user knows that the rotatable object has been rotated to the predetermined position. An example of such a click hinge is disclosed in Patent Document 1 (Japanese Patent No. 5415913).

[0003] Japanese Patent No. 5415913 (Claim 1, paragraphs 0018-0019 of the specification, Figure 1, etc.)

[0004] 6, 7A, and 7B, the click hinge 200 disclosed in Patent Document 1 includes a shaft 210 that serves as the hinge axis, a grooved plate 220, a cam plate 230, a biasing member 250, and a fixed plate 260. The shaft 210 is inserted through the grooved plate 220, the cam plate 230, the biasing member 250, and the fixed plate 260, with an insertion tip 212 fixed to the surface where the shaft 210 penetrates the fixed plate 260. The grooved plate 220 is configured to be rotatable around the central axis of the shaft 210 with the cam plate 230 and the biasing member 250 sandwiched between the grooved plate 220 and the fixed plate 260. The grooved plate 220 has a V-groove 224 formed therein that extends radially toward the outer periphery of the insertion hole 222 of the shaft 210, and the protrusion 232 formed on the cam plate 230, which is biased by the biasing force of the biasing member 250, enters the V-groove 224, creating a clicking sensation and positioning and fixing the grooved plate 220 (restricting rotation).

[0005] To facilitate insertion (assembly) of the shaft 210 into the insertion hole 222 of the grooved plate 220, the insertion hole 234 of the cam plate 230, the insertion hole 254 of the biasing member 250, and the insertion hole 264 of the fixed plate 260, the insertion holes 222, 234, 254, and 264 are formed slightly larger than the planar shape (cross-sectional shape) of the shaft 210. Therefore, as shown in FIGS. 7A and 7B , a certain amount of gap S0 is provided between the shaft 210 and the insertion holes 222, 234, 254, and 264, respectively. Even when the convex portion 232 of the cam plate 230 is fitted into the V-groove 224 of the grooved plate 220, this gap S0 between the shaft 210 and the insertion holes 222 and 234 can cause rattling in the grooved plate 220.

[0006] Therefore, the present invention aims to provide a click hinge that is easy to assemble with the shaft that serves as the hinge axis and a member having an insertion hole for inserting the shaft, at the same level as conventional technology, but which minimizes the rattle that occurs between the shaft and the member through which the shaft is inserted, and provides an excellent feel when used.

[0007] That is, the present invention is a click hinge which rotatably connects a grooved plate to a fixed plate around the axis of a shaft which forms a hinge axis, the shaft being formed with two first flat portions formed at opposing positions on the outer circumferential surface and two first arcuate surface portions formed between the first flat portions, the grooved plate being formed with a first insertion hole through which the shaft is inserted with a loose fit and a concave groove extending in the radial direction of the first insertion hole at the outer circumferential edge of the first insertion hole, the cam plate having two second flat portions following the cross-sectional shape of the shaft and two second arcuate surface portions formed between the second flat portions, the second insertion hole through which the shaft can be inserted and a first protrusion which can enter the concave groove, is disposed on the grooved plate in a state where it is overlapped in the plate thickness direction of the grooved plate, and two third flat portions following the cross-sectional shape of the shaft and each a stopper having two third arcuate surface portions formed between the third flat surfaces and having a third insertion hole through which the shaft can be inserted, is arranged overlapping the cam plate in the thickness direction of the cam plate; a biasing member that biases the stopper toward the cam plate and the grooved plate is arranged overlapping the stopper in the thickness direction of the stopper; the fixed plate is arranged overlapping the biasing member in the biasing direction of the biasing member, and the insertion tip of the shaft is fixed, and together with the grooved plate, it holds the biasing member, the stopper, and the cam plate together; and the cam plate and the stopper are arranged to be engageable so that the orientation of each second flat surface portion in the second insertion hole and the orientation of each third flat surface portion in the third insertion hole form a predetermined angle.

[0008] As a result, while the ease of assembly of the shaft that serves as the hinge axis and the member having an insertion hole for inserting the shaft is the same as with conventional technology, rattles that occur between the shaft and the member through which the shaft is inserted are minimized as much as possible, resulting in a click hinge that is excellent in usability.

[0009] Further, a first recess is formed on the cam plate on a surface opposite to a surface on which the first protrusion is formed, and a second protrusion that can enter the first recess of the cam plate is formed on the stopper, and the first recess is formed by extending in a direction rotated at a preset first angle with respect to either the first axis or the second axis in a first orthogonal coordinate system in which a first axis connecting the centers of the two second arcuate surface portions of the second insertion hole and a second axis connecting the centers of the two second flat surface portions of the second insertion hole intersect when the second insertion hole is viewed from above, and the second protrusion is formed by extending in a direction rotated at a preset first angle with respect to either the first axis or the second axis in a first orthogonal coordinate system in which a first axis connecting the centers of the two second flat surface portions of the second insertion hole intersects with When the through hole is viewed in a plane, in a second orthogonal coordinate system in which a third axis connecting the centers of the two third arcuate surface portions of the third insertion hole and a fourth axis connecting the centers of the two third flat surface portions of the third insertion hole intersect, it is preferable that the through hole is formed by extending in a direction rotated at a predetermined second angle opposite to the rotation direction of the first recess with respect to the third axis or the fourth axis extending in the same direction as either the first axis or the second axis selected in the first recess, and further, it is more preferable that the absolute values ​​of the first angle and the second angle are equal.

[0010] As a result, even if the clearance between the shaft and the member through which the shaft is inserted is increased, the amount of rattle between the shaft and the member through which the shaft is inserted can be reduced.

[0011] Furthermore, it is preferable that the first tangent angle formed by the first tangent at the contact point between the recessed groove and the first convex portion and the horizontal plane is different from the second tangent angle formed by the second tangent at the contact point between the first recessed portion and the second convex portion and the horizontal plane, and further, it is more preferable that the second tangent angle is larger than the first tangent angle.

[0012] As a result, the force required to release the engagement between the grooved plate and the cam plate can be made lower than the force required to release the engagement between the cam plate and the stopper, and the engagement between the grooved plate and the cam plate can be released (rotated as a hinge) without releasing the engagement between the cam plate and the stopper.

[0013] According to the configuration of the click hinge of the present invention, the ease of assembly of the shaft that serves as the hinge axis and the member having an insertion hole for inserting the shaft is the same as with conventional technology, but the rattle that occurs between the shaft and the member through which the shaft is inserted is minimized as much as possible, resulting in a click hinge that is excellent in usability.

[0014] FIG. 1 is an exploded perspective view of the click hinge of this embodiment. FIG. 2 is a perspective view of the main parts, with the grooved plate omitted, as viewed from the arrow II in FIG. 1. FIG. 3A is a plan view showing the state when a cam plate is attached to the shaft of the click hinge of this embodiment, and FIG. 3B is a plan view showing the state when the cam plate has been rotated in the direction of arrow A from the state shown in FIG. 3A. FIG. 4A is a plan view showing the state when a stopper is attached to the shaft of the click hinge of this embodiment, and FIG. 4B is a plan view showing the state when the stopper has been rotated in the direction of arrow B from the state shown in FIG. 4A. FIG. 5 is a side view of the main parts of the click hinge shown in FIG. 1 after assembly. FIG. 6 is an exploded perspective view showing a hinge structure of the prior art. FIG. 7A is a side view of the assembled click hinge as viewed from the arrow VII side in FIG. 6, and FIG. 7B is a plan view of the cam plate and grooved plate.

[0015] The click hinge 100 of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of the click hinge 100 of this embodiment. The click hinge 100 of this embodiment includes a shaft 10 serving as a hinge axis, a grooved plate 20, a cam plate 30, a stopper 40, a plurality of disc springs 50 serving as biasing members, and a fixed plate 60. In this embodiment, the click hinge 100 has a second hinge mechanism 70, which has the same structure as the click hinge 100 of the present invention, attached to the grooved plate 20, forming a so-called two-axis pivoting hinge structure, but the present invention is not limited to this embodiment. The second hinge mechanism 70 may also be omitted.

[0016] As shown in FIGS. 1 and 2 , the shaft 10 is basically a concentric cylinder having a large-diameter portion 12 and a small-diameter portion 14. The outer circumferential surface of the small-diameter portion 14 is alternately formed with two first flat portions 16 positioned opposite each other and first arcuate surface portions 18 formed between the two first flat portions 16. Furthermore, a tip-side flat portion 19 is formed within a required length range of the circumferentially intermediate portion of each of the first arcuate surface portions 18 at the tip end in the height direction of the small-diameter portion 14. Forming such tip-side flat portions 19 is advantageous in that it allows for positioning of the fixing plate in the height direction. In this embodiment, the small-diameter portion 14 is formed as a cylinder with a hollowed-out central portion 14A, but the small-diameter portion 14 may also be formed as a column. The shaft 10 is inserted through the first insertion hole 22 of the grooved plate 20, the second insertion hole 32 of the cam plate 30, the third insertion hole of the stopper 40, the fourth insertion hole 52 of the plurality of disc springs 50, and the fifth insertion hole 62 of the fixed plate 60. The inserted tip of the shaft 10 is fixed to the surface of the fixed plate 60 on the tip side where it is inserted (the surface opposite to the surface facing the disc springs 50).

[0017] That is, the grooved plate 20, cam plate 30, stopper 40, and multiple disc springs 50 are arranged in the order shown, overlapping in the thickness direction of each plate, and the fixed plate 60 is arranged above the disc spring 50, overlapping in the biasing direction of the disc spring 50. The cam plate 30, stopper 40, and multiple disc springs 50 are sandwiched between the grooved plate 20 and the fixed plate 60, and the biasing force of the multiple disc springs 50 presses (biases) the stopper 40 and cam plate 30 toward the grooved plate 20.

[0018] The grooved plate 20 is formed with a first insertion hole 22 through which the small diameter portion 14 of the shaft 10 is inserted loosely. The planar shape of the first insertion hole 22 is formed in a circular shape that allows the small diameter portion 14 of the shaft 10 to be inserted. In this way, the first insertion hole 22 of the grooved plate 20 is slightly larger than the planar shape of the small diameter portion 14 that is inserted into the first insertion hole 22, so that a gap (not shown) is formed between the outer circumferential surface of the small diameter portion 14 and the first insertion hole 22. This gap makes it possible to make the workability of inserting the shaft 10 (small diameter portion 14) into the first insertion hole 22 comparable to that of conventional technology.

[0019] Furthermore, a recessed groove 24 is formed on the upper surface of the grooved plate 20, extending from the outer periphery of the first insertion hole 22 in a radially outward direction of the first insertion hole 22. In this embodiment, the recessed groove 24 is formed as a so-called V-groove having a V-shaped cross section. The planar position of the outer end of the recessed groove 24 is flush with the outer periphery of the cam plate 30. In this embodiment, second hinge mechanisms 70 are attached to both end edges of the grooved plate 20. This second hinge mechanism 70 allows the grooved plate 20 to rotate about a rotation axis L2 (rotation axis of the second hinge mechanism 70) that is perpendicular to the direction of the central axis L1 of the shaft 10 and that is the center of rotation.

[0020] As shown in FIGS. 1 to 3A and 3B , the cam plate 30 is formed in a ring-like shape having a second insertion hole 32 through which the small diameter portion 14 of the shaft 10 can be inserted. As shown in FIG. 3A , the second insertion hole 32 is formed by two second flat portions 32A that conform to the cross-sectional shape of the small diameter portion 14 of the shaft 10 at the insertion portion into the second insertion hole 32, and a second arcuate surface portion 32B that is formed between the second flat portions 32A and connects one end of each of the second flat portions 32A. As is clear from FIG. 3A , the second insertion hole 32 is formed slightly larger in the width direction in FIG. 3A than the small diameter portion 14 of the shaft. Therefore, when inserting the small diameter portion 14 of the shaft 10 into the second insertion hole 32, the presence of the first gap S1 in the width direction allows the ease of inserting the small diameter portion 14 into the second insertion hole 32 to be maintained at the same level as that of the click hinge 100 of the prior art. After the small diameter portion 14 is inserted into the second insertion hole 32 , the small diameter portion 14 can rotate slightly in the circumferential direction of the second insertion hole 32 .

[0021] 1 and 2, a first protrusion 34 that can fit into the recessed groove 24 is formed on the underside of the cam plate 30 (the surface facing the grooved plate 20) and extends along the diameter of the cam plate 30 between the second insertion hole 32 and the outer periphery of the cam plate 30. In this embodiment, the cross-sectional shape of the first protrusion 34 is formed in a semi-cylindrical shape. 3A , the first protrusion 34 extends in a first orthogonal coordinate system defined by a first axis A1 (vertical dashed line in FIG. 3A ) passing through a center point O1 connecting the circumferential centers of the second arcuate surface portions 32B of the second insertion hole 32 and a second axis A2 (horizontal dashed line in FIG. 3A ) passing through the center point O1 connecting the longitudinal centers of the second flat portions 32A, the first protrusion 34 being parallel to a first central axis A3 (diagonal dotted line in FIG. 3A ) passing through the center point O1 and extending in a direction rotated by a predetermined first angle α degrees (relative to the first axis A1) around the outer periphery of the second insertion hole 32. The first width dimension W1 is wider than the width dimension W0 (see FIG. 1 ) of the recessed groove 24 formed in the grooved plate 20 (see FIG. 5 ).

[0022] 3A so that the first central axis A3 of the first protrusion 34 coincides with the first axis A1, the first corner DK1 of the small diameter portion 14 comes into contact with the intersection K1 between the second flat surface 32A and the second arcuate surface 32B in the upper left portion of the second insertion hole 32, as shown in FIG. 3B. This restricts the rotation of the cam plate 30 in the direction of arrow A (clockwise direction) relative to the small diameter portion 14.

[0023] Furthermore, a first recess 36 is formed on the upper surface of the cam plate 30 (the surface opposite to the surface on which the first protrusion 34 is formed). In this embodiment, the first recess 36 is formed in the same planar position as the first protrusion 34. The cross-sectional shape of the first recess 36 is formed in an isosceles trapezoidal shape. As shown in Figures 3A, 3B, and 5, the first recess 36 in this embodiment has an opening side width dimension W2 that is wider than a bottom side width dimension W3, forming an inverted trapezoidal shape.

[0024] As shown in Figures 1, 2, 4A, and 4B, the stopper 40 is formed in a ring-like plate shape having a third insertion hole 42 through which the small diameter portion 14 of the shaft 10 can be inserted. As shown in Figure 4A, the third insertion hole 42 is formed slightly larger in the width direction than the outer circumferential surface shape of the small diameter portion 14 of the shaft 10. In this embodiment, the planar shape of the third insertion hole 42 is formed to be the same shape as the second insertion hole 32. Specifically, the third insertion hole 42 is formed by two third flat portions 42A that imitate the cross-sectional shape of the portion of the small diameter portion 14 of the shaft 10 that is inserted into the third insertion hole 42, and a third arcuate surface portion 42B that is formed between the third flat portions 42A and connects one end of the third flat portions 42A to each other.

[0025] As is clear from Figure 4A, the third insertion hole 42 is formed slightly larger in the width direction in Figure 4A than the small diameter portion 14 of the shaft. Therefore, when inserting the small diameter portion 14 of the shaft 10 into the third insertion hole 42, the presence of the second gap S2 in the width direction allows the ease of inserting the small diameter portion 14 into the third insertion hole 42 to be maintained at the same level as that of the click hinge 100 in the prior art. Furthermore, after the small diameter portion 14 has been inserted into the third insertion hole 42, the small diameter portion 14 can be rotated slightly in the circumferential direction of the third insertion hole 42.

[0026] As shown in Figures 1 and 2, a second protrusion 44 that can fit into the first recess 36 is formed on the underside of the stopper 40 (the surface facing the cam plate 30) along the diameter of the stopper 40, extending between the third insertion hole 42 and the outer peripheral edge of the stopper 40. As shown in FIG. 4A , in a second orthogonal coordinate system formed by a third axis A4 (vertical dotted line in FIG. 4A ) and a fourth axis A5 (horizontal dotted line in FIG. 4A ) that connect the circumferential centers of the two third arcuate surface portions 42B of the third insertion hole 42 and pass through the center point O1 of the third insertion hole 42, the second protrusion 44 extends in a direction rotated by a predetermined second angle, β degrees, around the outer peripheral edge of the third insertion hole 42 (relative to the third axis A4) with the center point O2 of the third insertion hole 42 as the center of rotation, and is formed with a second width dimension W4 parallel to a second central axis A6 (diagonal dotted line in FIG. 4A ) that passes through the center point O1.

[0027] The third axis A4 extends in the same direction as the first axis A1 selected when defining the first central axis A3, which is the central axis of the first protrusion 34 located in the same plane as the first recess 36. That is, the second protrusion 44 is formed by extending in a direction rotated at a predetermined second angle β, which is the opposite direction to the rotation direction when forming the first recess 36, with respect to the third axis A4, which extends in the same direction as the first axis A1 selected for the first recess 36 in the second orthogonal coordinate system.

[0028] In this embodiment, since the second insertion hole 32 and the third insertion hole 42 are formed in the same shape, the second orthogonal coordinate system (the third axis A4 and the fourth axis A5) is the same as the first orthogonal coordinate system (the first axis A1 and the second axis A2). In this embodiment, the rotation directions of α degrees and β degrees are opposite to each other, and the absolute values ​​of the rotation angles are equal.

[0029] In this embodiment, the cross-sectional shape of the second protrusion 44 is an isosceles trapezoid, and the second width dimension W4 is the width dimension at the base of the isosceles trapezoid. Therefore, the tip width dimension W5 of the second protrusion 44 at the protruding tip end is narrower than the second width dimension W4. Furthermore, the tip width dimension W5 of the second protrusion 44 is narrower than the opening width dimension W2 of the first recess 36 and wider than the bottom width dimension W3 of the first recess 36. When the stopper 40 is rotated in the direction of arrow B in FIG. 4A so that the second central axis A6 of the second protrusion 44 thus formed coincides with the third axis A4, the second corner DK2 of the small diameter portion 14 abuts on the intersection K2 between the third flat surface portion 42A and the third arcuate surface portion 42B in the upper right portion of the third insertion hole 42, as shown in FIG. 4B . This restricts the rotation of the stopper 40 relative to the small diameter portion 14 in the direction of arrow B (counterclockwise).

[0030] The click hinge 100 in this embodiment is assembled from the grooved plate 20, the cam plate 30 in the state shown in Fig. 3B, the stopper 40 in the state shown in Fig. 4B, a plurality of disc springs 50 stacked on the top surface of the stopper 40, and a fixed plate 60. The cam plate 30, stopper 40, disc springs 50, and fixed plate 60 of the assembled click hinge 100 are rotatable around the central axis L1 of the shaft 10 relative to the grooved plate 20. A clicking sensation is obtained in the click hinge 100 when the first convex portion 34 of the cam plate 30 enters the recessed groove 24 of the grooved plate 20, or when the second convex portion 44 of the stopper 40 enters the first recessed portion 36 of the cam plate 30. When the first protrusion 34 enters the groove 24 and the second protrusion 44 enters the first recess 36, the rotation of the cam plate 30, stopper 40, disc spring 50 and fixed plate 60 is restricted by a predetermined force.

[0031] To explain this in more detail, when the second protrusion 44 of the stopper 40 is fitted into the first recess 36 of the cam plate 30 and the first protrusion 34 of the cam plate 30 is fitted into the recessed groove 24 of the grooved plate 20, the cam plate 30 and the stopper 40 are fitted together in a plan view, so that the orientation of the second flat surface 32A in the second insertion hole 32 and the orientation of the third flat surface 42A in the third insertion hole 42 are fitted together (engaged) to form a predetermined angle. In this state, as shown in FIG. 3B , the cam plate 30 restricts clockwise rotation relative to the shaft 10, and as shown in FIG. 4B , the stopper 40 restricts counterclockwise rotation relative to the shaft 10. As a result, rattle of the click hinge 100 around the central axis of the shaft 10 can be prevented.

[0032] 5, the engagement between the recessed groove 24 of the grooved plate 20 and the first protrusion 34 of the cam plate 30 is such that the first protrusion 34, which has a semi-cylindrical cross section, is inserted into the recessed groove 24, which has a V-shaped cross section. In contrast, the engagement between the first recess 36 of the cam plate 30 and the second protrusion 44 of the stopper 40 is such that the second protrusion 44, which has an isosceles trapezoidal shape smaller than the isosceles trapezoidal shape of the first recess 36, is inserted into the first recess 36, which has an isosceles trapezoidal cross section. Therefore, the engagement strength of the stopper 40 with the cam plate 30 is stronger than the engagement strength of the cam plate 30 with the grooved plate 20, and the engagement between the grooved plate 20 and the cam plate 30 can be released while always maintaining the engagement between the cam plate 30 and the stopper 40.

[0033] In this embodiment, the cross-sectional shape of the recessed groove 24 of the grooved plate 20 is V-shaped, and the cross-sectional shape of the first protrusion 34 of the cam plate 30 is semi-cylindrical. However, the cross-sectional shapes of both the recessed groove 24 and the first protrusion 34 may also be isosceles trapezoidal. In this case, it is preferable that the second tangent angle θ2 formed by the second tangent T2 and the horizontal plane H at the contact portion between the generatrix of the first recess 36 and the generatrix of the second protrusion 44 is greater than the first tangent angle θ1 formed by the first tangent T1 and the horizontal plane H (a plane perpendicular to the stacking direction of the components of the click hinge 100) at the contact portion between the generatrix of the recessed groove 24 and the generatrix of the first protrusion 34. This makes it possible to release the engagement between the grooved plate 20 and the cam plate 30 while always maintaining the engagement between the cam plate 30 and the stopper 40, just as with the grooved plate 20, cam plate 30, and stopper 40 described above.

[0034] Although the click hinge 100 according to the present invention has been described in detail above based on an embodiment, the technical scope of the present invention is not limited to the above embodiment. For example, the shaft 10 in this embodiment is illustrated as having the first flat portion 16, the first arcuate surface portion 18, and the tip flat portion 19 formed on the small diameter portion 14, but the shape of the shaft 10 is not limited to this. The click hinge 100 according to the present invention only needs to be able to rotate at least the cam plate 30 and the stopper 40 about the central axis L1 of the shaft 10 after the shaft 10 is inserted. Specifically, it is also possible to employ a small diameter portion 14 formed in a track shape including two first flat portions 16 without the tip flat portion 19, and a first arcuate surface portion 18 (formed between the first flat portions 16) connecting the first ends of the first flat portions 16 and the second ends of the first flat portions 16.

[0035] In addition, in the cam plate 30 of this embodiment, the first protrusion 34 and the first recess 36 are arranged in the same planar position to improve formability during resin molding or press molding, but this is not limited to this configuration. The planar positions of the first protrusion 34 and the first recess 36 do not have to be in the same planar position. Furthermore, although the planar shapes of the second insertion hole 32 of the cam plate 30 and the third insertion hole 42 of the stopper 40 are the same, the planar shapes of the second insertion hole 32 and the third insertion hole 42 may be different.

[0036] In addition, the first recess 36 (first protrusion 34) is formed along a first central axis A3 extending in a direction rotated by a predetermined first angle α with respect to a first axis A1 of a first orthogonal coordinate system, and the second protrusion 44 is formed along a second central axis A6 extending in a direction rotated by a predetermined second angle β with respect to a third axis A4 extending in the same direction as the first axis A1 selected when forming the first recess 36 (first protrusion 34), but the present invention is not limited to this configuration. The present invention may also employ a configuration in which the first recess 36 (first protrusion 34) is formed along a central axis (not shown) extending in a direction rotated by a predetermined first angle α with respect to a second axis A2 of the first orthogonal coordinate system, and the second protrusion 44 is formed along a central axis (not shown) extending in a direction rotated by a predetermined second angle β with respect to a fourth axis A5 extending in the same direction as the second axis A2 selected when forming the first recess 36 (first protrusion 34).

[0037] Furthermore, although the disc spring 50 is used as the biasing member in this embodiment, the biasing member is not limited to the disc spring 50. Any biasing member may be used as long as it can be inserted through the shaft 10 and sandwiched between the stopper 40 and the fixed plate 60, and any known biasing member such as a helical spring may be used as appropriate.

[0038] Furthermore, in this embodiment, the absolute values ​​of the first angle α and the second angle β are equal to each other, but the present invention is not limited to this. As long as the second angle β is rotated in the opposite direction to the rotation direction of the first angle α, the absolute values ​​of the first angle α and the second angle β may be different.

[0039] Furthermore, the configuration of the present embodiment described above may be appropriately combined with modified examples described in the specification or other known configurations.

Claims

1. A click hinge which rotatably connects a grooved plate to a fixed plate around the axis of a shaft which forms a hinge axis, the shaft being formed with two first flat portions formed at opposing positions on its outer circumferential surface and two first arcuate surface portions formed between the first flat portions, the grooved plate being formed with a first insertion hole through which the shaft is inserted with a loose fit and a concave groove extending in the radial direction of the first insertion hole at the outer circumferential edge of the first insertion hole, the cam plate having two second flat portions following the cross-sectional shape of the shaft and two second arcuate surface portions formed between the second flat portions, the cam plate having a second insertion hole through which the shaft can be inserted and a first protrusion capable of entering the concave groove, is disposed on the grooved plate in a state of being overlapped in the thickness direction of the grooved plate, a stopper having two third planar portions following the cross-sectional shape of the shaft and two third arcuate surface portions formed between each of the third planar portions, and having a third insertion hole through which the shaft can be inserted, is arranged in a state overlapping with respect to the cam plate in the plate thickness direction of the cam plate; a biasing member that biases the stopper toward the cam plate and the grooved plate is arranged in a state overlapping with respect to the stopper in the plate thickness direction of the stopper; the fixed plate is arranged in a state overlapping with respect to the biasing member in the biasing direction of the biasing member, and the insertion tip of the shaft is fixed, and holds the biasing member, the stopper and the cam plate together with the grooved plate; and the cam plate and the stopper are arranged to be engageable so that the orientation of each of the second planar portions in the second insertion hole and the orientation of each of the third planar portions in the third insertion hole form a predetermined angle.

2. A first recess is formed on the cam plate on a surface opposite to the surface on which the first protrusion is formed, and a second protrusion capable of entering the first recess of the cam plate is formed on the stopper, and the first recess is formed by extending in a direction rotated at a preset first angle with respect to either the first axis or the second axis in a first orthogonal coordinate system in which a first axis connecting the centers of the two second arcuate surface portions of the second insertion hole and a second axis connecting the centers of the two second flat surface portions of the second insertion hole intersect when the second insertion hole is viewed in a plane, and the second protrusion is The click hinge of claim 1, characterized in that, when the third insertion hole is viewed in a plane, in a second orthogonal coordinate system in which a third axis connecting the centers of the two third arcuate surface portions of the third insertion hole and a fourth axis connecting the centers of the two third planar portions of the third insertion hole intersect, the third axis or the fourth axis extending in the same direction as either the first axis or the second axis selected in the first recess is extended in a direction rotated at a predetermined second angle opposite to the rotation direction of the first recess.

3. The click hinge according to claim 2, wherein the absolute values ​​of the first angle and the second angle are equal.

4. A click hinge as described in claim 2 or 3, characterized in that a first tangent angle formed by a first tangent at the contact portion between the concave groove and the first convex portion and a horizontal plane is different from a second tangent angle formed by a second tangent at the contact portion between the first concave portion and the second convex portion and the horizontal plane.

5. The click hinge according to claim 4, wherein the second tangent angle is greater than the first tangent angle.

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