JP3793079B2 - Lens support structure for edgeless glasses - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lens support structure for edgeless glasses that does not have an edge frame into which an eyeglass lens is fitted.
[0002]
[Prior art]
Conventionally, in order to support and fix a lens to eyeglass parts such as an armor or bridge in edgeless eyeglasses, a male screw member fixed to the eyeglass parts is inserted into a mounting hole formed in the lens through a T-shaped washer made of a soft material. However, the most common structure is that the lens is fastened and fixed to the spectacle component by a nut screwed onto the male screw member.
[0003]
[Problems to be solved by the invention]
The conventional lens support structure usually uses a metal nut, but has a drawback that it is easily loosened while using glasses. Further, since T-shaped washers are fitted into the mounting holes from both sides of the lens in order to prevent damage to the lens, there is a problem in that the number of parts is large, and assembling work is troublesome and the cost is increased as a whole.
[0004]
Japanese Patent Publication No. 8-19929 discloses a resin nut for spectacles that replaces the conventional metal nut. The resin nut is formed with a screwless hole having a hole diameter slightly smaller than the outer diameter of the threaded portion of the male screw member in the nut body, and a bushing portion that fits into the mounting hole of the nut body and the lens is integrated with a synthetic resin material. The screw body of the nut body is screwed into the threaded portion of the male screw member to form a female screw on the inner peripheral surface of the screwless hole, and the elastic force of the female screw allows the In addition to preventing the nut body from loosening, the integrally formed bushing portion eliminates the need for a conventional T-type washer, thereby reducing the assembly cost.
[0005]
In recent years, shape memory alloys or highly elastic metal materials tend to be used for spectacle parts such as bridges and temples. In this case, however, the connecting support portion between the spectacle parts and the lens is excessive compared to conventional spectacles. As a result, there is a problem that a sufficient anti-sagging effect cannot be obtained even when the above-described resin nut is used.
[0006]
The present invention has been made in view of the above circumstances, and can improve the above-described resin nut to eliminate rattling in the connection support portion between the spectacle component and the lens, and also prevents the nut itself from loosening. An object of the present invention is to provide a lens support structure for large edgeless glasses.
[0007]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention inserts a male screw member fixed to a spectacle component such as an armor or a bridge into a mounting hole formed in the lens, and attaches the lens to the spectacle by a nut screwed to the male screw member. In a lens support structure that is fastened and fixed to a part, the nut is formed of a hard synthetic resin material, and a nut body provided with a rotating tool engaging portion on an outer surface, and extends concentrically from a fastening seat surface of the nut body. A bushing portion, the bushing portion having an outer diameter slightly smaller than the diameter of the mounting hole and a length substantially equal to or slightly shorter than the length of the mounting hole, and the male screw member from the bushing portion to the nut body is provided with holes without screws having a somewhat smaller pore size than the outer diameter of the threaded portion, while the base is fixed to the eyeglass component of the male screw member, said threaded portion Be formed on the unthreaded shank having a diameter approximately equal to the diameter, by said unthreaded hole screwing the nut fitted on the male screw member, the female screw is formed on an inner peripheral surface of the unthreaded hole In addition, the bushing portion that is inserted into the mounting hole expands in the radial direction as the female screw is formed , and the bushing portion expands further in the radial direction by the screwless shaft portion near the completion of screwing of the nut. In close contact with the inner wall surface of the mounting hole.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.
[0009]
FIG. 1 shows an exploded state of the parts constituting the lens support structure according to the present invention, and FIG. 2 is a plan view of a resin nut which is the main part. In FIG. 1, a configuration in which a male screw member 3 and a co-rotation pin 4 are arranged in parallel and fixedly protruded from an end portion of a spectacle component 1 such as an armor or bridge via a mounting piece 2, and a spectacle lens 5 The configuration in which the mounting hole 6 through which the male screw member 3 is inserted and the notch 7 for engaging the co-rotation pin 4 is provided at the end is the same as the conventional structure. The notch 7 may be formed in the engagement hole. The male screw member 3 is a metal screw, and a base portion 9 fixed to the spectacle part 1 is formed in a screwless shaft portion having a diameter substantially equal to the outer diameter D of the thread of the screw portion 8. A washer 10 made of, for example, nylon or polycarbonate is fitted.
[0010]
The resin nut 11 screwed to the male screw member 3 is integrally formed of a hard synthetic resin material such as polyacetal resin or polyamide resin, and has an engaging portion 13 of a rotating tool formed on the outer surface in a hexagonal column shape. A nut body 12, a flange portion 14 provided continuously on the seat surface side of the nut body 12, and a bushing portion 15 provided continuously with the flange portion 14 and extending concentrically with the nut body 12, A seating surface adjacent to the bushing portion 15 forms a tightening seating surface 16 of the nut body 12. The bushing portion 15 has an outer diameter B that is slightly smaller than the hole diameter A of the mounting hole 6 of the lens 5 and a length L that is substantially equal to or slightly shorter than the length K of the mounting hole 6. An unthreaded hole 17 extending from the nut body 12 to the nut body 12 is provided. The unthreaded hole 17 has a hole diameter C that is slightly smaller than the outer diameter of the threaded portion 8 of the male thread member 3. In the embodiment shown in FIGS. 1 and 2, the unthreaded hole 17 is located in the inner part of the nut body 12. The cap nut is sealed, and a cap body 18 is integrally formed on the top of the nut body 12.
[0011]
FIG. 3 shows a state in which the lens 5 is supported and fixed to the spectacle component 1 using the components configured as described above. First, the threaded portion 8 of the male screw member 3 is inserted into the mounting hole 6 of the lens 5, and the unthreaded hole 17 of the resin nut 11 is formed with the co-rotating pin 4 engaged with the notched portion 7 of the lens 5. When the resin nut 11 is screwed by engaging with the screw portion 8 and engaging the hexagon wrench or other rotating tool with the engaging portion 13 of the nut body 12, the screw portion 8 bites into the inner peripheral wall surface of the screwless hole 17. Thus, the female screw 20 is formed. Since the female screw 20 formed in this manner is in close contact with the screw portion 8 due to the elasticity of the resin material, it has an excellent function of preventing looseness. Further, the bushing portion 15 slightly expands in the radial direction by forming the female screw 20. In this way, the resin nut 11 moves forward toward the spectacle component 2 side while forming the female screw 20 on the inner peripheral wall surface of the screwless hole 17, and the bushing portion 15 is inserted into the mounting hole 6 of the lens 5, and further the flange portion When the fastening seating surface 16 of 14 closes to the completion of screwing in close contact with the lens 5, the opening in which the female screw 20 of the bushing portion 15 is formed is expanded in the radial direction by the base portion 9 including the unthreaded shaft portion of the male screw member 3. Then, the lens 5 is fixed to the inner wall surface of the mounting hole 6 and pressed against the resin washer 10 fitted in the base 9 to complete the tightening operation. The lens 5 is supported and fixed to the spectacle component 2 by the resin nut 11. . In this supported and fixed state, as well shown in FIG. 4, the female screw 20 formed on the resin nut 11 is in close contact with the screw portion 8 of the male screw member 3 and is expanded in the radial direction by the base portion 9. Since the bushing portion 15 is in close contact with the inner wall surface of the mounting hole 6, and the fastening seat surface 16 of the flange portion 14 and the resin washer 10 are in close contact with the lens 5, the connection support portion between the lens 5 and the spectacle component 2 There is no risk of rattling, and loosening of the resin nut 11 itself is effectively prevented.
[0012]
5 and 6 show an embodiment in which a screwless hole 17 of the resin nut 11 is provided through the nut body 12, and the method of use is the same as that of the embodiment shown in FIGS. Since it is the same, the same code | symbol is attached | subjected to the same component and description is abbreviate | omitted.
[0013]
The embodiment of FIG. 7 is similar to the embodiment shown in FIG. 1, and is the screwless hole 17 provided in the resin nut 11 substantially equal to the outer diameter D of the screw portion 8 at the opening end of the bushing portion 15? The outer peripheral surface 15a of the bushing portion 15 is tapered and has a slightly larger diameter, a point formed in a tapered hole 17 'having a diameter slightly smaller than the outer diameter D of the screw portion 8 at the inner diameter end of the nut body 12. The points formed on the surface are different. When the tapered hole 17 ′ is formed in this manner, the initial screwing resistance is small when the resin nut 11 is screwed into the threaded portion 8 of the male screw member 3, so that the female screw 20 can be easily formed by screwing. . Further, when the outer peripheral surface 15a of the bushing portion 15 is formed in a tapered taper surface, the lens 5 can be easily inserted into the mounting hole 6 and the variation in the hole diameter A of the mounting hole 6 can be dealt with. So it is more effective.
[0014]
【The invention's effect】
As described above, according to the present invention, the resin nut that is screwed onto the screw portion of the male screw member that is fixed to the spectacle component has the female screw that is formed on the inner peripheral surface of the screw-free hole in close contact with the screw portion. not only, the bushing portion formed in the nut body integrally expands radially close contact with the inner wall surface of the mounting hole of the lens, further the nut screwed completion upcoming tightening seat surface of the nut body comes into close contact with the lens The bushing portion is further bulged in the radial direction by the unthreaded shaft portion, so that there is no risk of rattling of the connection support portion between the lens and the spectacle part to which the male screw member is fixed, and the resin nut itself Therefore, it is extremely strong against external forces such as twisting and twisting acting on the lens and spectacle parts.
[Brief description of the drawings]
FIG. 1 is a partially longitudinal front view showing an exploded view of components constituting a lens support structure according to the present invention.
FIG. 2 is a plan view of a resin nut constituting the main part.
FIG. 3 is a longitudinal front view showing a lens support structure according to the present invention.
FIG. 4 is an enlarged cross-sectional view of the main part.
FIG. 5 is a partially longitudinal front view showing an exploded part of a lens support structure according to another embodiment of the present invention.
6 is a longitudinal sectional front view showing a lens support structure in the embodiment shown in FIG. 5. FIG.
FIG. 7 is a partially longitudinal front view showing an exploded view of components constituting a lens support structure in still another embodiment of the present invention.
[Explanation of symbols]
1 Glasses parts (Yoroi, bridge)
DESCRIPTION OF SYMBOLS 2 Mounting piece 3 Male thread member 4 Corotation prevention pin 5 Eyeglass lens 6 Mounting hole 7 Notch part 8 Screw part 9 Screwless shaft part 10 Resin washer 11 Resin nut 12 Nut main body 13 Turning tool engaging part 14 Flange part 15 Bushing part 16 Tightening seat surface 17 Unthreaded hole 18 Cap body 20 Female thread

Claims (1)

In a lens support structure in which a male screw member fixed to a spectacle component such as a Yoroi or a bridge is inserted into a mounting hole formed in the lens, and the lens is fastened and fixed to the spectacle component by a nut screwed to the male screw member.
The nut is formed of a hard synthetic resin material, and includes a nut body provided with a rotating tool engaging portion on an outer surface, and a bushing portion that extends concentrically from a tightening seat surface of the nut body. An outer diameter slightly smaller than the diameter of the mounting hole and a length substantially equal to or slightly shorter than the length of the mounting hole, and a hole diameter slightly smaller than the outer diameter of the threaded portion of the male screw member from the bushing portion to the nut body There are provided unthreaded holes with
On the other hand, the base portion fixed to the spectacle component of the male screw member is formed on a screwless shaft portion having a diameter substantially equal to the outer diameter of the screw portion,
By fitting the screwless hole to the male screw member and screwing the nut, a female screw is formed on the inner peripheral surface of the screwless hole, and the bushing portion inserted into the mounting hole is formed of the female screw. The bushing portion expands further in the radial direction by the unthreaded shaft portion near the completion of screwing of the nut, and closely contacts the inner wall surface of the mounting hole. No lens support structure for eyeglasses.

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