JP3119839B2 - Hinges frame structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hinge structure for rotatably connecting two members constituting an eyeglass frame, and more particularly to a hinge structure using a magnet.

[0002]

2. Description of the Related Art Conventionally, a hinge structure for rotatably connecting two members constituting an eyeglass frame has been proposed to reduce the play of the rotation operation and to improve the assemblability and detachability of the two members. For the purpose, various techniques using the magnetic attraction force and the magnetic repulsion force of a magnet have been proposed.

FIG. 10 is a diagram showing an example of such a prior art described in Japanese Patent Application Laid-Open No. 7-287200. In this prior art 1, a magnet 107 fixed to the crane 104 side is provided between concave portions having a U-shaped cross section formed by magnets 106a and 106b provided on the yoke 103 side.
a and 107b are fitted as protrusions, a pin 105 serving as a shaft member is inserted into a shaft hole passing through both the recess and the protrusion, and a cap 109 is fitted to the pin 105 to connect the recess and the protrusion. ing.

The magnets facing each other (magnet 106a
And the magnets 107a, 106b and 107b) are magnetically repelled to reduce abrasion of the sliding surface and prevent rattle of the crane 104.

[0005] FIG.
This is another prior art (prior art 2) described in Japanese Unexamined Patent Application Publication No. H10-260,837. The keeper 205 (one piece of the hinge) fixed to the eyeglass lens comprises a shaft portion 205a and a spherical portion 205b,
Attachment 2 magnetically attracted to the spherical portion 205b
06 (the other piece of the hinge) is a hemispherical case portion 206a.
And a pair of yokes 206b and a magnet part 206c.

The temple can be opened and closed by spherical contact using a magnetic circuit MC formed via the spherical portion 205b and the attachment 206.

[0007]

However, the hinge structure according to the prior art 1 employs the pin 105 to form a rotation axis, and is designed to prevent axial wear during rotation. In this case, the magnets opposed to each other magnetically repel each other to reduce the wear on the sliding surface, but the structure is complicated and the direction perpendicular to the axial direction due to the wear on the sliding surface between the pin 105 and the magnets 106a and 107a. There is concern about the occurrence of play.

Further, since a minute gap is provided between the opposed magnets, the degree of tightening of the fitting between the pin 105 and the cap 109 can be adjusted, or the inner width of the concave portion and the corresponding convex portion can be adjusted. It is necessary to increase the dimensional accuracy of the outer width dimension of, and it is considered that assemblability and manufacturability are reduced.

On the other hand, in the hinge structure of the prior art 2, the spherical portion 205b and the attachment 206 are coupled by magnetic attraction to enable free opening and closing operations of the temple by spherical contact. The temple has a structural feature that the temple angle becomes unstable and the temple can be detached from any angle because of the spherical contact so that the temple can be easily detached.

SUMMARY OF THE INVENTION The present invention has been made in view of the above prior art, and an object thereof is to provide a hinge structure using a magnet which rotatably couples two members constituting an eyeglass frame. Prevents play due to wear with a simple configuration,
It is an object of the present invention to provide a hinge structure which can stably hold a rotating shaft, does not accidentally come off, and has excellent detachability.

[0011]

In order to achieve the above object, according to the present invention, a hinge structure for rotatably connecting two members constituting an eyeglass frame is symmetrical about only one axis. A first hinge piece having a recess and supported by one member, and a second hinge having a protrusion coaxially fitted into the recess of the first hinge piece and supported by the other member. Magnetic force generating means provided on at least one of the hinge pieces for magnetically attracting each other while the concave and convex portions of the first and second hinge pieces are fitted to each other. And the following.

According to this structure, the rotating shaft is determined by the concave portion and the convex portion to be fitted, and the concave portion and the convex portion are directly magnetically attracted, so that rattling is prevented and the rotating shaft can be stably held. it can.

Also, in a hinge structure for rotatably connecting two members constituting an eyeglass frame, a first hinge piece having a concave portion which is symmetrical about only one axis and supported by one member. A second hinge piece having a projection coaxially fitted into a recess of the first hinge piece and supported by the other member; and a second hinge piece of the first and second hinge pieces. A magnetic force generating means provided on each hinge piece for magnetically repelling each other in a state where the concave portion and the convex portion are fitted to each other; and a first and a second hinge which are to be separated by magnetic repulsion. And a holding member for holding the relative positional relationship of the pieces in the axial direction.

According to this structure, the pivot axes of the first and second hinge pieces are determined and held by the holding member. Further, the surface pressure of the fitting truncated cone-shaped sliding surface of the concave portion and the convex portion can be reduced, and a smooth rotation operation and wear prevention can be achieved.

It is also preferable that the concave portion of the first hinge piece and the convex portion of the second hinge piece have concave and convex mortar-shaped portions which are fitted to each other to form a sliding surface. It is.

With this configuration, the first and second hinge pieces slide on the mortar-shaped sliding surface, so that play in both the axial direction and the direction perpendicular to the axis is suppressed. Can be.

It is also preferable that the concave and convex mortar-shaped portions fitted to each other have a truncated cone shape.

Therefore, even if wear occurs on the frusto-conical sliding surface, the first and second hinge pieces only slightly approach each other in the axial direction, thereby maintaining a stable rotation of both. Can be.

It is also preferable that the concave and convex mortar-shaped portions which are fitted to each other to form a sliding surface have a step-shaped step.

As a result, the sliding surface in the axial direction and the sliding surface in the circumferential direction are formed independently, so that the rotation axes of the first and second hinge pieces can be stably maintained. .

It is also preferable that the first and second hinge pieces have a shaft and a shaft hole which are coaxial with and fitted to the mortar-shaped portion.

According to this, the first and second fingers are formed by fitting the concave and convex portions having a truncated cone shape and the shaft and the shaft hole which are coaxial with and fitted to the concave and convex portions. The number piece can be rotated more stably.

The bottom of the recess of the first hinge piece and the second
It is also preferable to provide a gap between the hinge piece and the tip of the projection.

According to this configuration, the magnets do not come into direct contact with each other, so that a smooth turning operation can be obtained, and even if the sliding surface is worn, the first and second hinge pieces move in the axial direction. Only a little approach can be achieved, and a stable rotation operation of both can be maintained.

It is also preferable that both the first and second hinge pieces are provided with magnetic force generating means, so that the magnetic attraction force or repulsion force is enhanced, and the material of each hinge piece is limited to a magnetic material. Eliminates the need.

Further, the second hinge piece includes an arm member extending from a side surface, and the first hinge piece is used when the second hinge piece is fitted. An axial window for avoiding interference with the arm member, and a circumferential window for allowing the arm member to pass therethrough while allowing the first and second hinge pieces to be fitted and for allowing the arm member to rotate. And a unit.

According to this, the operation in the case where the present invention is applied to the hinge for connecting the yoke and the temple (arm member) of the spectacle frame will be described. In the state where the temple is attached to the second hinge, Can be assembled to the first hinge. Further, the rotation region of the temple can be defined by the circumferential window portion, and the opening / closing angle of the temple can be determined.

The arm member of the second hinge piece has a first rotation position in a use state and a second rotation position in a storage state.
The second hinge piece may be used in a rotation area between the rotation position and the position of the axial window portion of the second hinge piece.

Therefore, the arm member is normally used in a rotation area between the first rotation position in the use state and the second rotation position in the storage state, so that the arm member and the second The position of the axial window of the hinge piece does not match, and the arm member functions as an axial stopper because it is inserted and guided through the circumferential window.

In order to fit the first and second hinge pieces, the arms can be fitted by aligning the positions of the axial windows of the arm members and the second hinge pieces. Specifically, when the arm member is a temple or a joining member with the temple, it is possible to rotate the temple further inward than the storage position of the temple by removing the lens of the glasses, or to slightly move the temple. By bending the temple, it is also possible to position the temple at a position other than the normal rotation area. By arranging the axial window at this position, the temple can be used during the assembling process or when particularly desired (cleaning, adjustment, etc.). At the time of maintenance), the hinge piece can be fitted or removed.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIG. 1A is a cross-sectional configuration explanatory view schematically illustrating a hinge structure 1 of an eyeglass frame according to a first embodiment of the present invention, and FIG. FIG. 3 is a diagram in which the hinge structure 1 is provided at a joint between the eyepiece frame 2 and the temple 3.

The hinge structure 1 will be described as being for rotatably connecting the yoke 2 and the temple 3 of the spectacle frame, but the application site of the hinge structure 1 is not limited to this. In addition, for example, the present invention can be applied to a bridge portion of a spectacle frame of a system that is folded in two at a bridge portion.

The hinge structure 1 has a truncated cone-shaped concave portion 4a as a concave mortar-shaped portion at the lens-side end of the temple 3.
And the first hinge piece 4 having a
The second hinge piece 5 is provided with a convex portion 5a having a truncated cone shape as a convex mortar-shaped portion that fits into the a.

The recess 4a of the first hinge piece 4 has a bottom 4b.
Is formed with a central portion 4c which is recessed one step, and a magnet 6 as a magnetic force generating means is fitted and fixed in the central portion 4c.

A magnet 7 as magnetic force generating means is attached and fixed to the tip of the convex portion 5a of the second hinge piece 5. The magnet 7 is provided in such a shape as to extend the truncated cone shape of the projection 5a.

The magnet 6 and the magnet 7 are connected to the first and second magnets.
In the state where the concave portions 4a and the convex portions 5a of the hinge pieces 4 and 5 are fitted, the directions of the magnetic poles are set so as to be magnetically attracted to each other, and the first and second hinges in the fitted state. Pieces 4 and 5 are magnetically attracted.

Also, since the sliding surfaces of the concave portion 4a and the convex portion 5a to be fitted are frustoconical side surfaces which are symmetrical about only one axis, the rotation axis (this rotation axis is virtually It is not a shaft that is actually rotated by the shaft member.) In addition, rattling in both the thrust and radial directions can be prevented, and the rotating shaft can be stably held.

When the first and second hinge pieces 4 and 5 are fitted, they can be easily fitted together, and the rotation moment about the hinge structure 1 as an axis to the temple 3 (for example, Even if the direction A1 in FIG. 1 is applied, the frustoconical side surfaces of the concave portion 4a and the convex portion 5a are in close contact with each other, so that the hinge structure 1 does not come off accidentally.

The central portion 4c of the concave portion 4a of the first hinge piece 4
Is formed around the shoulder 4d, and a gap G is provided between the shoulder 4d and a surface facing the magnet 7. Accordingly, the magnets 6 and 7 do not come into close contact with each other, so that a smooth rotating operation can be obtained, and even if the sliding surfaces of the truncated conical side surfaces of the concave portion 4a and the convex portion 5a are worn, the first and second magnets are not removed.
The hinge pieces 4 and 5 only slightly approach in the axial direction,
It is possible to maintain a stable rotation operation of both.

The first and second hinge pieces 4, 5 themselves are made of a magnet material, and are magnetized so as to be magnetically attracted in the fitted state, so that the magnets 6, 7 are unnecessary. It is also possible.

The shape of the concave and convex mortar-shaped portions is not limited to a truncated cone, but may be any shape that is symmetrical about only one axis and can define a rotation axis. It is also possible to adopt a configuration having a spherical or parabolic cross section, or a configuration having a stepped step by concentrically stacking cylinders having different outer diameters.

(Embodiment 2) FIG. 2 is an explanatory sectional view showing a hinge structure 11 according to a second embodiment, which differs from the first embodiment in the arrangement of magnets. And The same components as those of the hinge structure 1 are denoted by the same reference numerals, and description thereof will be omitted.

In the hinge structure 11, a cylindrical hole is formed inside the truncated cone-shaped protrusion 5a of the second hinge piece 5, and a cylindrical magnet 17 is held inside the hole. ing.
A disc-shaped mounting hole is formed at the bottom of the first hinge piece 4, and a magnet 16 is adhered to the mounting hole. The pieces 4 and 5 of the hinge 2 are magnetically attracted.

Other functions and effects are the same as those of the hinge structure 1 of the first embodiment. However, according to this structure, the magnet can be fixed easily and securely, and the assembling property can be improved. Becomes possible.

(Embodiment 3) FIG. 3 is an explanatory sectional view showing a hinge structure 21 according to a third embodiment. The first embodiment is different from the first embodiment in that the magnets 6A and 7A have a magnetic structure. In different directions so that they repel each other. The same components as those of the hinge structure 1 are denoted by the same reference numerals, and description thereof will be omitted.

Since the sliding surfaces of the concave portion 4a and the convex portion 5a to be fitted to each other are frustoconical side surfaces, the rotation axes of the first and second hinge pieces 4 and 5 are determined, and The rotation shaft can be stably held by preventing rattling in both the thrust and radial directions, but the magnetic repulsive force generated by the magnets 6A and 7A causes the concave portion 4a and the convex portion 5a to be separated from each other in the axial direction. It is urged in the direction to do.

Accordingly, the first and second hinge pieces 4 and 5 are sandwiched between the arms 22a and 22b of the cover member 22 as a holding member having a substantially U-shaped cross section, thereby forming the first and second hinges. The relative positions of the hinge pieces 4 and 5 in the axial direction are maintained.

As described above, by repelling the magnets, the contact surface pressure of the sliding surface between the concave portion 4a and the convex portion 5a can be reduced, and a smooth turning operation and wear prevention can be achieved.

(Embodiment 4) FIG. 4 is an explanatory sectional view showing a hinge structure 31 according to a fourth embodiment. The magnet of the hinge structure 11 according to the second embodiment of FIG. 2 is shown in FIG. 16,17
Are set in directions that repel each other.

Then, in order to maintain the relative positional relationship between the first and second hinge pieces 4 and 5 in the axial direction, the magnet 16 penetrates from the lower end surface of the magnet 16 and is fastened to the tip of the convex portion 5a. The adjusting screw 32 as a holding member is tightened.

Depending on the degree of tightening of the adjusting screw 32, the first
In addition, the surface pressure of the sliding surfaces of the second hinge pieces 4 and 5 can be adjusted, and smooth rotation and wear prevention can be achieved. It should be noted that a washer member made of a thin low-friction material is provided to reduce wear caused by sliding between the adjusting screw 32 and the end face of the magnet 16.
It is also possible to make the two heads into a funnel-shaped seating surface that fits together.

It is also possible to set the magnetic directions of the magnets 16 and 17 of the hinge structure 11 so as to attract each other, and to provide an adjusting screw 32.

In this case, the first and second hinge pieces 4,
In addition to being attracted by the magnets 16 and 17, the adjusting screw 32 prevents the shaft 5 from being detached in the axial direction. Even when a moment or an impact is applied in the direction in which the hinge structure 11 is removed, the first member 5 can be moved. In addition, it is possible to reliably maintain the engagement state of the pieces 4, 5 of the second hinge.

(Embodiment 5) FIG. 5 is an external perspective view of a hinge structure 41 of a fifth embodiment, and FIG.
It is sectional drawing at the time of cutting by one plane.

FIG. 7A is a side view showing only the first hinge piece 44, and FIGS. 7B and 7C are side views showing only the second hinge piece 45. FIG. And a front view. I have.

The structure of the hinge structure 41 will be described with reference to FIGS. 5, 6 and 7. The first hinge piece 44 is connected to the end of the yoke 2, and the second hinge piece 45 is It is connected to the lens-side end of the temple 3 as an arm member. The first hinge piece 44 includes a sliding surface 44b, which is a slope of a truncated cone, and a sliding surface 44b on the inner diameter side of the cylindrical member 44a.
Is formed.

The side wall 44d has a circumferential window 44e for allowing the temple 3 to pass therethrough and allowing its rotation, and an upper end of a cylindrical member 44a connected to one end of the circumferential window 44e. An axial window portion 44f is formed by cutting the side wall portion 44d up to the portion. still,
By setting the opening area of the circumferential window 44e to a predetermined range, the rotation area of the temple 3 (for example, a state in which the temple 3 for storing the glasses is closed, and the temple 3 is moved by approximately 90 degrees from the closed state) It is also possible to prescribe (the state of wearing open glasses).

A hole 44g is formed at the bottom of the cylindrical member 44a in the figure, and a magnet 46 is fitted therein.

The second hinge piece 45 includes a sliding surface 45b, which is a slope of a truncated cone that slides on the sliding surface 44b, and a sliding surface 45b.
The modified cylinder 45a in which a cylinder portion 45c following the b is formed.
Are the main components.

Further, a hole 45d is formed in the end surface on the sliding surface 45b side of the deformed cylinder 45a, a magnet 47 is fitted therein, and a hole 45e is provided in a side surface of the cylinder 45c, so that the temple 3 can be fitted and fixed. And A hole 45f is provided in the end surface on the side of the column portion 45c, and the first and second hinge pieces 4 are provided.
Interference with the magnet 46 when the fittings 4 and 45 are fitted is prevented.

The first and second hinge pieces 44 and 45 are fitted and used as shown in FIG. Magnet 46
And 47 are magnetically attracted to each other, and the first hinge piece 4
4 and the sliding surface 45b of the second hinge piece 45.
Thus, the pivot axis of the hinge structure 41 is determined, and rattling in both the thrust and radial directions is prevented, and the pivot axis is stably held.

The 45f hole of the deformed cylinder 45a and the magnet 4
6 is set so as to be a relationship between the shaft hole and the shaft to be fitted, so that the rotation axis of the first hinge piece 44 and the second hinge piece 45 can be changed. Since the sliding surfaces 44b and 45b and the outer peripheral surface of the magnet 46 and the hole 45f are formed so as to be axially supported at two points separated in the axial direction, the rotation can be performed more stably.

The fitting relationship between the magnet 46 and the 45f hole of the deformed cylinder 45a set to have the relationship between the shaft hole and the shaft to be fitted is described in the fourth embodiment shown in FIG. It is also possible to constitute by an independent member such as an adjusting screw.

To assemble the first and second hinge pieces 44 and 45, the temple 3 is connected in advance to the second hinge piece 45, and the connected temple 3 and the first hinge piece 44 are assembled. When the positions of the axial window portions 44f are adjusted to approach each other in the axial direction, the magnetic attraction forces of the magnets 46 and 47 attract and fit the first and second hinge pieces 44, 45.

Then, by rotating the temple 3 along the circumferential window 44e and moving it from the position of the axial window 44f, the temple 3 does not come off.

The position of the axial window 44f in the hinge structure 41 shown in FIG. 5 and FIG. 7 is provided at a position where the temple 3 is in a closed state.

Accordingly, by pushing up the temple 3 in the axial direction (upward in the figure) of the hinge structure 41 with the temple 3 closed, the first and second hinge pieces 44 and 4 are pushed up.
5 can be released and the temple 3 can be removed.

FIG. 8 shows a state between the first position P1 (solid line) where the temple 3 is opened in the normal use state and the second position P2 (chain line) where the temple 3 is stored (folded). In the rotation area indicated by the arrow A2, the position of the temple 3 does not match the position of the axial window 44f, and the temple 3 is rotated only when the temple 3 is further rotated from the second position P2 in the storage direction (upward in the drawing). FIG. 8A is a view for explaining a hinge structure 41 adopting a configuration in which the position of the axial window portion 44f coincides with that of FIG. 3, and FIG.
FIG. 9B is an enlarged view of a portion D1 in FIG.

As shown in FIG. 8, the axial window 4
By positioning the position 4f outside the rotation area of the arrow A2, the hinge cannot be removed in a normal use state.

However, the temple 3 is bent by bending the temple 3 like a temple 3A shown by a dotted line, or by removing a lens or the like and rotating the temple 3 to a position of a temple 3B (an arrow A4) shown by a dotted line. The position of the axial window 44f can be matched, so that the hinge piece can be fitted or removed during the assembling process or particularly when desired.

(Embodiment 6) FIG. 9 is a sectional view of a hinge structure 51 according to a sixth embodiment. The same components as those of the hinge structure 41 of the fifth embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As a characteristic configuration of the hinge structure 51, the sliding surfaces 44b, 45b of the frusto-conical hinge structure 41 are provided on the first and second hinge pieces 54, 55. Instead, as a configuration corresponding to the sliding surfaces 44b and 45b, a columnar concave portion 54b forming a step portion 56 having a stepped cross section is provided.
And the large-diameter cylindrical portion 55b.

Since the sliding surface in the axial direction and the sliding surface in the circumferential direction are thereby formed independently, the rotation axes of the first and second hinge pieces can be stably maintained. .

The number of steps of the step section 56 is 1 in FIG.
Although it is a step, a plurality of steps can be formed.

[0075]

According to the present invention described above, it is possible to prevent the occurrence of backlash due to abrasion with a simple configuration and to stably hold the rotating shaft. The hinge structure of the spectacle frame which is excellent in detachability without being easily removed can be obtained.

By providing a gap in the axial direction between the first and second hinge pieces, the magnets do not come into close contact with each other, so that a smooth turning operation can be obtained, and the sliding surface of the mortar-shaped portion is worn. Occurs, the pieces of the hinges only slightly approach each other in the axial direction, and a stable rotation operation of both can be maintained.

It is also preferable to provide magnetic force generating means on both the first and second hinge pieces, so that it is not necessary to increase the magnetic attraction force and to limit the material of each hinge piece to a magnetic material.

By having a shaft and a shaft hole which coaxially fit with the concave and convex portions of the first and second hinge pieces, a shaft which coaxially fits with the concave and convex portions and the concave and convex portions. The first and second hinge pieces can be more stably rotated by the shaft fitting between the shaft hole and the shaft hole.

By providing an axial window and a circumferential window through which the arm member of the second hinge piece is inserted through the first hinge piece, the arm member is attached to the second hinge piece. Can be assembled to the first hinge with the armature member attached, and the rotation region of the arm member can be defined by the circumferential window.

By arranging the position of the axial window of the second hinge piece outside the normal rotation area of the arm member, the arm member can be inserted through the circumferential window in a normal use state. Since it is guided, it stops in the axial direction and the hinge cannot be removed. However, by aligning the position of the arm member and the axial window at the time of the assembling process or particularly when desired, the hinge piece can be fitted or removed, thereby improving assembling and maintenance. .

According to the structure provided with the magnetic force generating means provided on each hinge piece for magnetically repelling each other with the concave and convex portions of the first and second hinge pieces fitted together. The rotation axis of the first and second hinge pieces is determined, and the thrust and the radial play are prevented from rattling to stably hold the rotation axis. In addition, the surface pressure of the sliding surface between the concave portion and the convex portion to be fitted can be reduced, and smooth rotation operation and wear prevention can be achieved.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a hinge structure according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a hinge structure according to a second embodiment of the present invention.

FIG. 3 is a diagram illustrating a hinge structure according to a third embodiment of the present invention.

FIG. 4 is a diagram illustrating a hinge structure according to a fourth embodiment of the present invention.

FIG. 5 is a diagram illustrating a hinge structure according to a fifth embodiment of the present invention.

FIG. 6 is a diagram illustrating a hinge structure according to a fifth embodiment of the present invention.

FIG. 7 is a diagram illustrating a configuration of a hinge structure according to a fifth embodiment of the present invention.

FIG. 8 is a diagram illustrating a method of assembling a hinge structure according to a fifth embodiment of the present invention.

FIG. 9 is a sectional view of a hinge structure according to a sixth embodiment of the present invention.

FIG. 10 is a view for explaining a conventional hinge structure.

FIG. 11 is a diagram illustrating a conventional hinge structure.

[Explanation of symbols]

1,11,21,31,41,51 Hinge structure 2 Yoroi 3 Temple (arm member) 4,44,54 First hinge piece 4a Concave part 4b Bottom part 4c Central part 4d Shoulder part 5,45,55 2 hinge piece 5a convex portion 6,7,16,17,6A, 7A, 46,47 magnet (magnetic force generating means) 22 cover member (holding member) 32 adjusting screw (holding member) 44a cylindrical member 44b Sliding surface 44c Cylindrical portion 44d Side wall portion 44e Circumferential window portion 44f Axial window portion 44g Hole 45a Deformed cylinder 45b Sliding surface 45c Cylindrical portion 45d, 45e, 45f hole 56 Step G Gap P1 First position P2 Second Position of

Claims (10)

(57) [Claims] 1. A hinge structure for rotatably connecting two members constituting an eyeglass frame, wherein a first hinge piece having a concave portion symmetrical only on one axis and supported by one member. A second hinge piece having a protrusion coaxially fitted into a recess of the first hinge piece and supported by the other member; and a first hinge piece of the second hinge piece. A hinge structure for an eyeglass frame, comprising: magnetic force generating means provided on at least one hinge piece for magnetically attracting each other while the concave portion and the convex portion are fitted to each other. 2. A hinge structure for rotatably connecting two members constituting an eyeglass frame, wherein the first hinge piece has a concave portion which is symmetrical only on one axis and is supported by one member. A second hinge piece having a protrusion coaxially fitted into a recess of the first hinge piece and supported by the other member; and a first hinge piece of the second hinge piece. Magnetic force generating means provided on each hinge piece for magnetically repelling each other in a state where the concave portion and the convex portion are fitted to each other; and a first and a second hinge to be separated by magnetic repulsion. And a holding member for holding a relative positional relationship between the pieces in the axial direction. 3. The recess of the first hinge piece and the second hinge piece.
3. The hinge structure for an eyeglass frame according to claim 1, wherein each of the convex portions of the hinge piece has a concave and a convex mortar-shaped portion which are fitted to each other to form a sliding surface. . 4. The hinge structure for an eyeglass frame according to claim 3, wherein the concave and convex mortar-shaped portions fitted to each other have a truncated cone shape. 5. The hinge of the spectacle frame according to claim 3, wherein the concave and convex mortar-shaped portions which are fitted to each other to form a sliding surface have a step-shaped step. Construction. 6. The piece according to claim 3, wherein the first and second hinge pieces have a shaft and a shaft hole which are coaxial with and fitted to the mortar-shaped portion. The hinge structure of the eyeglass frame described. 7. A gap is provided between the bottom of the concave portion of the first hinge piece and the tip of the convex portion of the second hinge piece. The hinge structure of the eyeglass frame described in the section. 8. The hinge structure for an eyeglass frame according to claim 1, wherein magnetic force generating means is provided on both the first and second hinge pieces. 9. The second hinge piece includes an arm member extending from a side surface, and the first hinge piece is used when the second hinge piece is fitted to the second hinge piece. An axial window for avoiding interference with the arm member, and a circumferential window for allowing the arm member to pass therethrough while allowing the first and second hinge pieces to be fitted and for allowing the arm member to rotate. The hinge structure for an eyeglass frame according to any one of claims 1 to 8, further comprising: 10. The arm member of the second hinge piece is used in a rotation area between a first rotation position in a use state and a second rotation position in a stowed state, and 10. The hinge structure for an eyeglass frame according to claim 9, wherein the position of the axial window of the hinge piece is located outside the rotation area.