JP2022108753A - Resin-rim-integrated metal spectacle frame - Google Patents

Abstract

To provide a spectacle frame capable of firmly connecting resin rims with a metal frame and further improving external appearance of a shaping process with neither thickening rim parts nor making joint members conspicuous.SOLUTION: A front frame 2 includes a front frame comprised of lenses 22, 22, and resin rim parts 21, 21 for holding the lenses 22, 22; and a metal frame 3 comprised of rear frame parts 31, 31 closely disposed on the rear sides of the rim parts 21, 21, a bridge part 32 integrally formed with the rear frame parts 31 for connecting the left/right rear frame parts 31, 31, and end pieces 33, 33 integrally formed with the rear frame parts 31, 31 and disposed at left/right ends of the rear frame parts 31, 31. The front frame 2 and the metal frame 3 are fixed with a plurality of rivet members 4, 4,..., and head portions in the front frame 2 side, of the rivet members 4, 4,... are formed approximately flush with the front frame 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a spectacle frame in which a metal frame and a resin rim are integrated.

Eyeglasses have an important position not only as vision correction tools, but also as fashion items. Products that emphasize decorativeness are also being developed.

In recent years, eyeglass frames with a classic impression, such as Boston-type glasses with resin rims, have been revisited, and eyeglasses that have been reborn with modern designs using new materials and processing techniques despite the old frame type are also in the spotlight. bathed in

In the case of these resin rims, from the viewpoint of ensuring strength, the strength of the front frame is increased by increasing the width of the rim or by joining the resin front frame and a thin plate-shaped metal frame. is being done. In particular, when connecting a resin front frame and a thin plate-shaped metal frame, conventionally, the metal frame is generally embedded in the resin front frame to form the spectacle frame.

On the other hand, regarding the connection between the resin front frame and the thin plate-shaped metal frame, as a conventional manufacturing method, the front frame and the metal frame placed behind it are joined with screws to increase the strength and the front There is also a method of forming a thin frame.

On the other hand, as a technology to provide a new design for spectacles using a resin rim, conventionally, a rivet-like connecting member is attached to the resin-made rim, and a wire-like temple arm or bridge is attached to the connecting member. A technology of spectacles that can be worn has been disclosed (see Patent Document 1).

Japanese Unexamined Patent Application Publication No. 2004-287177

In terms of the relationship between design and strength, in the case of a structure in which a metal frame is embedded in a resin front frame, the front frame must be thick and wide, giving the front frame a heavy impression. As a result, there was the inconvenience that it looked unsophisticated, and although it was suitable for older men, it was not suitable for the tastes of the demand group such as young people and women.

On the other hand, if the front frame and the metal frame placed behind it are joined by screws, the screws themselves as joining members are thick, and the screw heads are particularly large and have grooves, so the screw head part will stand out.
In addition, there is a problem that a smooth form is not obtained due to the presence of a step with the rim portion, resulting in an unsightly appearance.

On the other hand, in the technique of Patent Document 1, only wire-shaped temple arms and bridges can be selected, which narrows the room for design selection.
In addition, since only flexible resin can be selected for the connecting member to the rim made of resin so that the wire can be fitted therein, a large number of such members must be arranged on the rim from the viewpoint of ensuring strength. Therefore, there is also a problem that many crimped portions of the connecting member are visible when viewed from the front, which is important as an impression when wearing spectacles, resulting in an unsightly appearance.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and its object is not only to be able to firmly connect a resin rim to a metal frame, but also to achieve a To provide a spectacle frame capable of improving the appearance of shaping processing without making joint members conspicuous.

Means adopted by the present inventor to solve the above problems are as follows. The spectacle frame of the present invention basically comprises a front frame and a metal frame made of metal. there is

Here, the front frame is composed of a pair of left and right lenses and a resin rim portion that holds the lenses.
This resin-made rim part includes a form of holding a part of the outer circumference of the lens in addition to a form of holding the entire outer circumference of the lens. In addition to the type in which the left and right rim portions are connected by a bridge, the type in which the left and right rim portions are not connected by a bridge and are independent is also included.

Further, the metal frame is composed of a back bar portion arranged in close contact with the rear of the rim portion, a bridge portion connecting the back bar portion, and end pieces provided at the left and right ends of the back bar portion. did.

The back bar portion, the bridge portion, and the tip portion are integrally formed without connecting parts by performing processing accompanied by plastic deformation or partial removal processing from one metal material.

The front frame and the metal frame are fixed by a plurality of rivet members, and the head portion of the rivet member on the front frame side is formed substantially flush with the front frame.

In the fixing position of the rivet member, a concave portion having a larger outer shape than the first through-hole is formed on the rear surface of the rim along with the first through-hole coaxially with the first through-hole. preferably.
In this case, on the front side of the back bar portion at a position corresponding to the recess, a tubular portion having a size matching the outer shape of the recess is formed along with the second through hole so as to protrude coaxially with the second through hole. By doing so, the cylindrical portion can be fitted into the recess.

By using a rivet member to fasten the tubular portion in a state where it is fitted in the recess, when force is applied to the rim portion or the back bar portion in the planar direction, the outer peripheral portion of the tubular portion and the inner portion of the recess are prevented from moving. The movement in the planar direction is restricted by contact with the peripheral portion.

In addition, it is also possible to provide the first through-hole and the concave portion on the front side of the back bar portion, and provide the second through-hole and the cylindrical portion on the rear side of the rim portion.

It is preferable that the fastening position by the rivet member is provided at least at the connecting portion between the back bar portion and the bridge portion and the connecting portion between the back bar portion and the tip portion.
By fixing at least two points each on the left and right sides, the position in the rotational direction is regulated.

Furthermore, it is preferable that the width of the portion of the rim portion along the outer peripheral portion of the lens is made larger than the width of the back bar portion of the portion that overlaps with the portion when viewed from the front.
In other words, it is preferable that the back bar portion has a width dimension that does not protrude beyond the rim portion when viewed from the front.

In addition, it is preferable that the metal frame is made of a metal containing titanium or stainless steel, which is characterized by high yield strength and tensile strength. The metal containing titanium also includes pure titanium.

In the present invention, the metal frame is formed by integrally forming the back bar portion, the bridge portion, and the end portion from a single metal material. part does not exist.
As a result, the strength of the entire metal frame is improved, and since the parts required for joining are not required, the metal frame can be formed with a narrow width, which in turn allows the resin rim portion to be formed with a narrow width. As a result, the spectacle frame has practical strength, and a stylish design can be achieved without the resin rim having a thick and unfashionable appearance.

In addition, in the plurality of rivet members that fasten the front frame and the metal frame, the heads of the rivet members on the front frame side after fastening are formed substantially flush with the front frame, resulting in a smooth and integrated design. There is an effect that it becomes a certain molding process and improves the aesthetics of the appearance.

Furthermore, in the case where the cylindrical portion is inserted into the concave portion at the fixing position of the rivet member, when inserting the rivet member into the first through hole and the second through hole, the front end is placed on the jig. Workability such as insertion and caulking of rivet members and finishing accuracy are dramatically improved without misalignment between the frame and the back bar portion.
As a result, there is also the effect that spectacle frames having a smooth and integral front frame can be uniformly produced without requiring the skills and techniques of a skilled craftsman. The same effect can be obtained by forming the concave portion on the front side of the back bar portion and forming the cylindrical portion on the rear side of the rim portion.

In this configuration, the concave portion is formed coaxially with the first through hole, and the cylindrical portion is formed coaxially with the second through hole.
In this case, the uneven shape for alignment between the concave portion and the cylindrical portion is originally provided at the joint portion which is difficult to visually recognize from the outside. Moreover, even if a transparent or translucent resin is used for the rim portion, the uneven shape is hidden behind the head of the rivet member, making it difficult to see through the rim portion.
As a result, there is also an effect that the appearance shaping process can be finished with good appearance.

In addition, the size of the outer shape of the cylindrical portion is matched to the outer shape of the concave portion so that they fit together. A shearing force can be received between the side wall of the cylindrical portion and the side wall of the recess.
Therefore, there is also an effect that the concentration of shearing force on the rivet member is alleviated, and the strength of the spectacle frame is further improved.

On the other hand, the fastening positions of the rivet members are set to at least the connecting portion between the back bar portion and the bridge portion and the connecting portion between the back bar portion and the end portion on each of the left and right sides, respectively. It is also possible to prevent the rotation of the .
At the same time, since the fixing position is the minimum necessary, the number of rivet members appearing in the appearance is reduced, and there is also an effect that the appearance of the appearance is hardly spoiled in the modeling process.

In addition, by making the peripheral edge of the rim portion of the front frame wider than the width of the back bar portion of the metal frame that overlaps with it, the metal frame does not look unsightly when viewed from the front of the glasses. Therefore, there is also an effect that the appearance of the front frame can be improved without impairing the appearance of the front frame.

Further, by forming the metal frame from a metal containing titanium or stainless steel, there is an effect that even a narrow metal frame can sufficiently ensure strength while being lightweight.

1 is an overall perspective view showing a spectacle frame of Example 1 of the present invention; FIG. 1 is a front view and a partial sectional view showing a pair of left and right front frames of Example 1 of the present invention; FIG. 1 is a front view, a plan view, and a partial cross-sectional view showing a metal frame of Example 1 of the present invention; FIG. 1 is a front view showing a rivet member of Example 1 of the present invention; FIG. It is an explanatory view for explaining the procedure of assembling the spectacle frame of Example 1 in the present invention. Fig. 2 is an overall perspective view showing a spectacle frame of Example 2 of the present invention; FIG. 11 is an overall perspective view showing a spectacle frame of Example 3 of the present invention; FIG. 11 is an overall perspective view showing a spectacle frame of Example 4 of the present invention.

"Example 1"
Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 5. FIG. In addition, the present invention is not limited to the embodiments shown in these drawings.

(basic configuration)
The spectacle frame 1 in this embodiment is a so-called combination type spectacle frame including a pair of left and right front frames 2, 2 and a metal frame 3, as shown in FIG.

The front frames 2.2 are composed of resin lenses 22.22 and resin rims 21.21 for holding the lenses 22.22. In this embodiment, the rim portions 21, 21 are held by the entire outer periphery of the lenses 22, 22 in a so-called full rim format, and the left and right rim portions 21, 21 are not connected by a bridge and are independent.
In addition, in this embodiment, the lens shape is a so-called Boston type, but it is also possible to configure it with various other lens shapes such as a round type and a square type.

The metal frame 3 is composed of back bar portions 31, 31, a bridge portion 32 connecting the back bar portions 31, 31, and end pieces 33, 33 arranged at the left and right ends of the back bar portions 31, 31. It is configured.

The front frames 2, 2 and the metal frame 3 are arranged such that the back bar portions 31, 31 are closely attached to the rear of the rim portions 21, 21, and are fixed and integrated by the rivet members 4, 4, which will be described later. ing.
In detail, the rivet members 4, 4, . . . In other parts, the back bar portions 31, 31 and the rim portions 21, 21 are arranged in contact with each other.
Therefore, the back bar portions 31, 31 and the rim portions 21, 21 need only be in close contact with each other at least at the fastening positions of the rivet members 4, 4, and a slight gap may be provided in other portions. good.

The nose pads 5 are constructed by brazing clings to the back side of the metal frame 3 .

(Configuration of front frame)
Next, the configuration of the front frames 2, 2 of this embodiment will be described with reference to FIG. The front frame 2 of this embodiment comprises a lens 22 and a rim portion 21. The lens 22 is formed along the outer periphery of the lens 22 in a groove (not shown) formed along the inner periphery of the rim portion 21. It is mounted by fitting a convex portion (not shown).

The rim portions 21, 21 of the front frames 2, 2 are made of resin such as acetate or celluloid, and can be made of various materials and colors such as opaque, transparent or translucent.

A rectangular projecting portion is formed at the end of the rim portion 21 on the end portion 33 side.・23 is installed through.
This first through hole 23 is a hole having a circular cross section in this embodiment, and its inner diameter is formed to match the outer diameter of the rivet member 4 .

A bottomed stepped portion 26 is formed coaxially with the first through hole 23 on the front side of the rim portion 21 . This stepped portion 26 is also a stepped portion having a circular cross section, and its inner diameter is formed to be substantially the same as the diameter of the head portion 41 of the rivet member 4 .

Furthermore, a bottomed recess 24 is formed coaxially with the first through hole 23 on the rear surface side of the rim portion 21 . This concave portion 24 is also a stepped portion with a circular cross section, and its outer diameter is formed to match the outer diameter of a tubular portion 35 of the back bar portion 31, which will be described later.

The first through-hole 23, the stepped portion 26, and the recess 24 can be formed by cutting after molding the rim portion 21, but can also be formed simultaneously with the rim portion 21 by, for example, injection molding. In addition, these are not limited to circular cross-sections, and may have other cross-sectional shapes such as elliptical or rectangular.

(Composition of the metal frame)
Next, the configuration of the metal frame 3 of this embodiment will be described with reference to FIG. The metal frame 3 of this embodiment includes back bar portions 31, 31, a bridge portion 32 connecting the left and right back bar portions 31, 31, and end pieces 33 disposed at the left and right ends of the back bar portions 31, 31.・Consists of 33

The metal frame 3 is made of pure titanium (JIS: H4600) such as JIS type 1 or JIS type 2. As a molding method, a pure titanium plate material is formed by performing processing that involves plastic deformation such as die-cutting and bending by press molding, and removal processing such as cutting and polishing, while adding heat treatment. can be done. In addition, plating treatment is performed after molding.
The material is not limited to pure titanium, but other metals can be used, but from the viewpoint of the balance between strength and weight, it is preferable to use a metal containing titanium or stainless steel.

The back bar portions 31, 31 have a shape along the outer periphery from the upper side portion to the inner side portion of the lenses 22, 22 when viewed from the front, and are elongated rods having a cross-sectional shape with approximate dimensions of width and thickness. Also, in plan view, along the curve of the lens 22, the tip portions 33, 33 have a slightly curved shape.

A bridge portion 32 for connecting the back bar portions 31, 31 is integrally formed with the back bar portions 31, 31 at the portions facing each other. The bridge portion 32 protrudes slightly upward at a substantially right angle from the joints with the back bar portions 31, 31, and has a portion that protrudes forward. It has a shape with a bulging portion.
This bridge portion 32 is also in the shape of an elongated rod having a cross-sectional shape with approximate dimensions of width and thickness.

At the left and right ends of the back bar portions 31.31, end pieces 33.33 for hinge-connecting the temples 6 are formed integrally with the back bar portions 31.31. This tip portion 33 extends rearward at a substantially right angle from the tip of the back bar 31, and the extended tip portion has a semicircular bulge toward the back side of the tip portion and screws for forming a hinge. A threaded hole is provided through which a member (not shown) is screwed.
In addition, the semicircular bulging portion has a slit-like shape removed by cutting at the central portion in the thickness direction, thereby forming a shape in which the semicircular plate-like portions are arranged vertically in parallel. (not shown). The tips of the temples 6, 6 are inserted into the slits and rotatably screwed, so that the temples 6, 6 can be folded inward.

The bridge portion 32 and the end pieces 33 and 33 are formed integrally with the back bar portions 31 and 31 by processing a single plate material, and are connected by welding or screws like a general spectacle frame. The structure has no joints between parts and parts.

With such a structure, there are no stress-concentrated portions or fragile portions, and the strength of the metal frame 3 as a whole is improved. In addition, since there is no need for parts to be welded or mechanically fastened, even if the thickness is the same as that of a conventional metal frame, the width can be made thinner, and the cross-sectional shape is similar to the width and thickness. can be

In this embodiment, a plate material having a predetermined size is used so that the width and thickness of the cross-sectional shape are similar to each other after processing. It is also characterized by having substantially uniform width and thickness as a whole, including the bent portions, except for the semicircular bulging portions of the end pieces 33, 33, although it has a portion.
As a result, the width of the rim portions 21, 21 arranged in front of the metal frame 3 is also narrow, and an appearance with a sophisticated impression can be obtained without partially increasing the width.

In addition, by integrally molding the metal frame 3 from a single plate material, the dimensional accuracy of the metal frame 3 as a whole is improved, and assembly work (described later) such as insertion of the rivet members 4 and caulking in the spectacle frame 1 is reduced. In addition to facilitating the production process, uniform products can be produced even by non-skilled workers, and the quality is improved.

At positions corresponding to the first through-holes 23, 23 of the metal frame 3, near the boundaries between the back bar portions 31, 31 and the bridge portion 32 and between the back bar portions 31, 31 and the end pieces 33, 33. Second through holes 34, 34 . . . are provided near the boundary portions, respectively.

This second through hole 34 is a hole having a circular cross section in this embodiment, and its inner diameter is formed to be the same size as the inner diameter of the first through hole 23 .

A tubular portion 35 is formed coaxially with the second through hole 34 on the front side of the metal frame 3 . The cylindrical portion 35 is a convex step with a circular cross section, and its outer diameter is formed to match the inner diameter of the recess 24 of the first through hole 23 . Furthermore, the height of the step of this cylindrical portion 35 is formed to match the depth of the recess 24 of the first through hole 23 .

The convex shape of the cylindrical portion 35 is formed at the same time when the metal frame 3 is press-molded, and the second through hole 34 is formed by cutting after the press-molding. It should be noted that these are not limited to circular cross-sections, and may have other cross-sectional shapes such as elliptical or rectangular.

(Regarding metal frame processing)
In the processing of the metal frame 3, a plate-shaped pure titanium material is mainly formed by press molding and cutting. Due to the lack of precision, the dimensions tend to vary.

In addition, since the cross-sectional shape of the metal frame 3 of the present embodiment is similar in width and thickness, bending at a deep angle or pressing against the mold with a strong force in order to suppress the occurrence of springback causes a comparison. significant bending stress is generated.
Therefore, if the bridge portion 32 and the tip portions 33, 33 are to be bent substantially at a right angle with a short dimension, cracks are likely to occur in the bent portion.

Therefore, in the present embodiment, bending is performed in a plurality of times using a plurality of molds so that the bending angle gradually increases, and heat treatment by annealing is added between each bending, so that residual bending is performed. It undergoes a process to remove stress and processing strain.

In addition, when bending a metal material with such a cross-sectional shape in a short dimension at a substantially right angle, processing conditions such as press load and time must be delicately adjusted depending on conditions such as variations in the material and temperature during processing. have to be fine-tuned.
In this regard, in the field of metal processing of spectacle parts, most of the bending and forming processes are generally processed in a uniform manufacturing process by automatic machine control. It is very difficult to process the material into the shape of the metal frame 3 as in this embodiment, which leads to a loss of working efficiency with conventional manufacturing equipment.
As in the metal frame 3 of this embodiment, in order to bend a titanium material having dimensions similar to each other in width and thickness in a short dimension at a substantially right angle, it is necessary to finely adjust the operation and force of the press machine. is required and can only be realized by precise mechanical control.

This applies not only to pure titanium, but also to metals such as stainless steel, which have high strength and tend to cause springback.

In addition, in order to bulge the periphery of the screw hole at the tip of the tip portion toward the back side of the tip portion in a semi-circular shape, the tip portion of the tip portion 33, 33 is made of a plate material that is partially widened in advance, and is compressed by press molding. It is realized by performing a thickening process that deforms the material of the wide portion in the thickness direction by plastically deforming it. As a result, while maintaining the same width as the other portions of the metal frame 3, it is processed into a semi-circular bulging shape toward the rear side of the tip portion.

After the press molding process, the entire burr is trimmed by cutting, and the tips of the end pieces 33, 33 are slit, screw holes, and second through holes 34, 34, for attaching the rivet members 4, 4, etc. 34…perforate.

As a final step, after the metal frame 3 is formed into a shape, a predetermined plating process is performed. In addition, since springback may occur even by plating, it is preferable to remove processing distortion by annealing again before plating.

(Structure of rivet member)
Next, the structure of the rivet member 4 in this embodiment will be described with reference to FIG. The rivet member 4 of this embodiment is entirely made of stainless steel, and is processed into a stepped bar shape having a head portion 41 by turning, pressing, or rolling a bar-shaped material. Also, the tip 42 is formed in a conical shape for easy insertion.

The main body of the rivet member 4 preferably has a small outer diameter as long as the strength permits it, and in this embodiment, a diameter of about 1 mm is used. Also, it is preferable that the outer diameter of the head portion 41 is not extremely large compared to the outer diameter of the main body of the rivet member 4 . By doing so, it is possible to reduce the area of the head portion 41 that appears in the appearance after fastening, and even if the rim portion 21 is formed of a transparent or translucent resin, the rim portion 21 can be The rivet member 4, which is seen through, becomes inconspicuous, and the design is less likely to be spoiled.

Next, the procedure for assembling the spectacle frame 1 according to this embodiment, that is, the procedure for connecting the front frames 2 and the metal frame 3 with the rivet members 4 will be described with reference to FIG. First, as shown in FIG. 5(a), the tubular portion 35 formed in the back bar portion 31 is inserted so as to fit into the concave portion 24 formed in the rim portion 21. Then, as shown in FIG. Here, the metal frame 3 is placed on the jig so that the cylindrical portion 35 faces upward, and the front frame 2 is lowered from above to engage.

At this time, one cylindrical portion 35, for example, the cylindrical portion 35 formed on the side of the bridge portion 32 and the corresponding concave portion 24 of the rim portion 21 are fitted first, and then formed on the end portion 33 side. By adopting a procedure of fitting and inserting the cylindrical portion 35 and the corresponding recess 24 of the rim portion 21, it is possible to reliably fit the cylindrical portions 35 and 35 and the recesses 24 and 24. can.

In addition, since there are at least two insertion positions, i.e., the connecting portion between the back bar portions 31 and 31 and the bridge portion 32 and the connecting portion between the back bar portions 31 and 31 and the end pieces 33 and 33, it is possible to It is possible to prevent the front frames 2, 2 and the metal frame 3 from rotating around one of the fitting positions, which dramatically improves workability and finishing accuracy. It is easy to assemble even for those who are not, and it is possible to produce uniform products.

In this embodiment, the height of the step of the tubular portion 35 is formed to match the depth of the recess 24 of the first through hole 23, so that the tubular portion 35 and the recess 24 are fitted. In the inserted state, the rim portion 21 and the back bar portion 31 are arranged in contact with each other. By making the height of the step of the cylindrical portion 35 higher than the depth of the concave portion 24 of the first through hole 23, a gap is formed between the rim portion 21 and the back bar portion 31. may

Then, as shown in FIG. 5(b), when the cylindrical portions 35, 35 and the concave portions 24, 24 are inserted, the first through holes 23, 23 and the second through holes 34, 34 are coaxially penetrating holes, and the tip portion 42 of the rivet member 4 is inserted into these holes from the rim portion 21 side.

Here, by making the diameter of the stepped portion 26 into which the head 41 of the rivet member 4 is inserted substantially the same as the diameter of the head 41 of the rivet member 4, the rivet member 4 and the stepped portion 26 There is no gap between them, and the molding process has a good appearance, which further improves the design. In this state, the head portion 41 of the rivet member 4 may partially protrude slightly from the rim portion 21. On the contrary, the depth of the stepped portion 26 is set in advance so that a recessed portion does not occur. It is preferable to keep

Further, as shown in FIG. 5(c), a so-called caulking operation is performed to plastically deform the tip portion 42 of the rivet member 4 using a dedicated tool or processing machine. As a result, the front frame 2 and the metal frame 3 are firmly bonded together at this fixing position.

(Structure in which the rivet member and the front frame have a sense of unity)
Then, as the final step, the head portion 41 of the rivet member 4 partially protruding slightly from the rim portion 21 is processed to be substantially flush with the rim portion 21 by grinding.
As a result, in addition to the fact that there is no gap between the rivet member 4 and the stepped portion 26, the sense of unity between the front frame 2 and the rivet members 4, . . . Not only are the 4... inconspicuous, but depending on the design, they can function as design accents. The head portion 41 of the rivet member 4 may be processed in advance into a shape that is substantially flush with the rim portion 21, and the polishing process may be omitted.

When the head portion 41 of the rivet member 4 is processed to be substantially flush with the rim portion 21 by polishing, if the head portion 41 of the rivet member 4 is automatically polished by a polishing machine, the resin front frame 2 may be deeply ground due to variations in the dimensions of the rivet member 4 and the like. There is a risk of
Therefore, in polishing, first, only the head portion 41 of the rivet member 4 is manually scraped with a file to align the surface with the front frame 2, and then the head portion 41 of the rivet member 4 and the front frame 2 are buffed. By polishing at the same time, the surface is finished with a sense of unity.

Even in this polishing, it is very difficult to match fine points and finish the surface with a sense of unity by polishing with an automated machine. and skillful operation of the buffing machine.

Here, in general, when the rims 21 and 21 are made of transparent or translucent resin, depending on the refractive index of the rims 21 and 21 made of resin, the internal structure may appear enlarged like a lens. Because of this phenomenon, when the uneven shape for alignment is formed at a position different from the fixing position, the uneven shape inside is easily visible from the outside and stands out.
However, in the spectacle frame 1 of this embodiment, the stepped portions 26, 26... and the recesses 24, 24... in the front frames 2, 2 are formed coaxially with the first through holes 23, 23... Cylindrical portions 35, 35, . . . of the frame 3 are formed coaxially with the second through holes 34, 34, .
Therefore, the uneven shape due to the tubular portions 35, 35 and the concave portions 24, 24, which can be seen through the rim portions 21, 21, and the uneven shape for positioning the rivet members 4, 4, etc. are the fixing positions. It is inconspicuous compared to the case where it is formed at a different position.

In addition, regarding the relationship between the sizes of the front frames 2 and the metal frame 3 in the width direction, the width of the portions of the rim portions 21 and 21 along the outer peripheral portions of the lenses 22 and 22 is the width of the portion that overlaps with the portion in front view. It is preferable to make it thicker than the width of the back bar portions 31.31.
As a result, the back bars 31 and 31 do not protrude from the rims 21 and 21 around the periphery of the lenses 22 and 22, which are the most important parts of the front view when wearing eyeglasses. It can give the impression of a full-rim type spectacle frame.

Furthermore, in the present embodiment, the outer shape of the cylindrical portion 35 is matched to the outer shape of the recess 24 so that they are fitted together. Even if a shearing force is generated in the back bar portion 31, the side wall portion 36 of the cylindrical portion 35 and the side wall portion 25 of the recess 24 are in contact with each other, so that the shearing force can be received between them. can.
As a result, the shear stress generated in the rivet member 4 is relieved, and the strength of the spectacle frame 1 is further improved. The cross-sectional shape of the tubular portion 35 and the concave portion 24 is preferably circular from the viewpoint of stress concentration. It is possible.

As described above, the spectacle frame 1 of the present embodiment not only has a classic impression but also has a modern sophisticated design by using a slender rim, and also secures a practical strength. In spite of this, the spectacle frame 1 can have a highly designed design.

"Example 2"
Next, Embodiment 2 of the present invention will be described with reference to FIG. In addition, the same code|symbol is attached|subjected about the structure similar to Example 1, and it omits about the overlapping description.

As shown in FIG. 6, the spectacle frame 1 of this embodiment is different from that of the first embodiment in that the back bar portions 31 are formed over the entire peripheries of the lenses 22.22. In addition, in the front frames 2, two first through holes 23, 23 are provided on each of the left and right sides of the rim portion 21, and two first through holes 23, 23 are formed in the rectangular protruding portion of the end portion of the rim portion 21 on the end portion 33 side. It is also different from the first embodiment in that two second through holes 34, 34 are provided on the right and left sides of the metal frame 3 at corresponding positions.

The spectacle frame 1 of this embodiment differs from the spectacle frame of the first embodiment in that the integrally formed metal frame 3 is formed over the entire outer peripheries of the lenses 22, 22. Strength can be improved over 1.

Further, by fixing two rivet members 4 to the rectangular protruding portion of the end portion of the rim portion 21 on the end portion 33 side, it is possible to further disperse the impact caused by dropping the spectacle frame 1 or the like. In addition, it is possible to disperse the stress applied around the end pieces 33, 33 due to the opening and closing of the temple 6, so that the strength can be further improved.

Further, in the rivet member 4, since the metal frame 3 is formed over the entire outer peripheries of the lenses 22, 22, the lower side of the lens 22 also has the first through hole 23 and the second through hole 34, etc. can be formed, and the fixing position of the rivet member 4 can be increased to any position on the rim portion 21. In that case, there is an effect of further improving the strength.

"Example 3"
Next, Example 3 of the present invention will be described with reference to FIG. In addition, the same code|symbol is attached|subjected about the structure similar to Example 1, and it omits about the overlapping description.

As shown in FIG. 7, the spectacle frame 1 of this embodiment differs from that of the first embodiment in that the rim portions 21 of the front frames 2 and 2 are half rims having only the upper sides.

Since the positions and number of fastenings by the rivet members 4 are the same as in the first embodiment, the strength of the connection between the front frames 2 and the metal frame 3 is the same as in the first embodiment, but the frame type is changed. The use of the half-rim increases the room for design selection, so that spectacle frames 1 with more diverse designs can be configured.

"Example 4"
Next, Embodiment 4 of the present invention will be described with reference to FIG. In addition, the same code|symbol is attached|subjected about the structure similar to Example 1, and it omits about the overlapping description.

As shown in FIG. 8, the spectacle frame 1 of this embodiment differs from that of the first embodiment in that the resin rims 21, 21 are connected at the center to form a front frame 2 in which the left and right sides are integrated. different.
The left and right ends of the rim portions 21, 21 are curved rearward along the end pieces 33, 33, and are covered so that the metal end pieces 33, 33 are not visible when viewed from the side.

In addition, the temples 6, 6 are made of resin, and have a structure in which a metal shaft is embedded inside by insert molding. A metal shaft is partially exposed and a screw hole is formed (not shown) at the end of the temple 6, 6 on the side of the end pieces 33, 33, so that it can rotate freely with the end pieces 33, 33. By being screwed, the temples 6, 6 can be folded inward.

With such a configuration, when the eyeglass frame 1 is worn, it looks like an all-resin frame eyeglass from both the front view and the side view, and the front frame 2 has a narrow and sophisticated design, The spectacle frame 1 having a practical strength can be provided by the metal frame 3 .

Although the present invention is generally configured as described above, the present invention is not limited to the illustrated embodiments, and various modifications are possible within the scope of the claims. Alternatively, the cylindrical portion may be formed on the rim side, and the concave portion may be formed on the back bar side.

Further, the fixing position of the rivet member 4 may be arranged at two positions at the connecting portion between the back bar and the bridge, both of which belong to the technical scope of the present invention.

1 spectacle frame 2 front frame
21 Rim
22 lenses
23 First through hole
24 recess
25 Side wall of recess
26 Stepped part 3 Metal frame
31 Back bar
32 Bridge
33 Tomobe
34 Second through hole
35 Cylindrical part
36 side wall of cylindrical part 4 rivet member
41 head
42 Tip 5 Nose pad 6 Temple

Then, the front frame and the metal frame are fixed by a plurality of rivet members, and the entire top surface of the head portion of the rivet member on the front frame side becomes the envelope surface of the surface around the head portion of the front frame. It is configured as follows.

Claims (5)

a front frame comprising a pair of left and right lenses and a resin rim portion holding the lenses;
A metal body consisting of a pair of left and right back bar portions arranged in close contact with the rear of the rim portion, a bridge portion connecting the back bar portions, and end pieces provided at the left and right ends of the back bar portion. with a metal frame,
The back bar portion, the bridge portion and the tip portion are integrally formed,
A spectacle frame, wherein the front frame and the metal frame are fixed by a plurality of rivet members, and the head portion of the rivet member on the front frame side is formed substantially flush with the front frame. At the fixing position of the rivet member, on the rear surface side of the rim portion or on the front surface side of the back bar portion, together with the first through hole, a concave portion having an outer shape larger than the first through hole is formed coaxially with the first through hole. formed on the
On the front side of the back bar portion or the rear side of the rim portion at a position corresponding to the recess, there is a second through hole and a cylindrical portion having a size matching the outer shape of the recess is coaxially with the second through hole. formed to protrude,
2. The spectacle frame according to claim 1, wherein the cylindrical portion is fitted in the concave portion and fixed. 3. The spectacle frame according to claim 1, wherein said fixing position is at least a connecting portion between the back bar portion and the bridge portion and a connecting portion between the back bar portion and the tip portion. 4. The spectacle frame according to any one of claims 1 to 3, wherein the width of the portion of the rim portion along the outer peripheral portion of the lens is wider than the width of the back bar portion of the portion overlapping with the portion in front view. . The spectacle frame according to any one of claims 1 to 4, wherein the metal frame is made of metal containing titanium or stainless steel.

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