JPH0819929B2 - Resin nut for glasses - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin nut used for fixing a lens of spectacles to a frame or the like.

[0002]

2. Description of the Related Art Generally, when fixing a lens to a metal member or the like in a frameless frame type eyeglass, after a T-shaped washer 31 made of a soft material is fitted from both sides into a mounting hole 22 of the lens 21 as shown in FIG. Usually, it is assembled to the metal member 24 using machine screws 25 and nuts 32.

[0003]

However, this conventional structure has a drawback that the nut is loosened during use because it does not have a loosening preventing function because it is tightened by a normal metal nut. In order to prevent this loosening, it is sufficient to tighten with a double nut, but this is unaesthetic. Further, in this structure, in order to prevent the lens from being damaged, T-shaped washers are fitted from both sides of the lens, and there are problems that the number of parts is large and the workability of assembly is poor and the cost is high.
The present invention solves these problems and has a locking function,
And it was invented for the purpose of providing an inexpensive nut which does not damage the lens.

[0004]

This object is to extend from a nut portion provided with a tool engaging portion on the outer peripheral surface and a tightening surface formed on the nut portion and which is slightly larger than the outer diameter of the screw.
Eyeglasses integrally formed with a bushing portion having an inner diameter from a resin material, and the same threadless hole having a diameter equal to or smaller than the effective diameter of a predetermined screw is formed in the center of the nut portion over the entire length. Reach by providing resin nuts for
Is made.

[0005]

In the resin nut of this structure, the threaded hole of the resin material is smaller than the outer diameter of the screw, so the thread is formed by the machine screw (or tapping screw) when tightening.
Moreover, the elasticity of the resin material can tighten the outer surface of the screw to prevent the screw from loosening. Also, the conventional T-shaped washer is not required.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, A is a resin nut, and a nut portion 1 having a tool engaging portion 2 having a hexagonal outer periphery,
The nut portion 1 and the bushing portion 4 extend concentrically from the tightening surface 3 of the nut portion 1.
Is integrally molded with a resin material (polyacetal resin, polyamide resin, or the like). This nut part 1
At the center of the hole, there is a threaded hole 5 that has the same hole diameter over the entire length. The diameter may be slightly smaller than the diameter). On the other hand, the inner diameter 6 of the bushing portion 4 is formed to be slightly larger than the outer diameter of the screw used, and the outer diameter of the bushing portion 4 is made smaller than the outer dimension of the nut portion 1 to form the tightening surface 3. Has been done. Further, the tool engaging portion 2 is a hexagonal shape in the embodiment, but may be a two-sided surface or another polygonal shape capable of engaging with a tool to be held.
The resin nut A can be manufactured inexpensively by an injection molding method using various resin materials.

The resin nut A having this structure is most suitable for fixing the lens of the frameless glasses. As shown in FIG. 3, the bushing portion 4 of the resin nut A is inserted into the mounting hole 22 of the lens 21 to hold the tool engaging portion 2 (hexagonal outer shape portion), and the flat washer 23 and the metal member 24 (for example, frame metal fittings). ) And a metal machine screw 25 (or a tapping screw) which is inserted into the bushing portion 4 are further pushed into the inner diameter 6 of the bushing portion 4, and when the machine screw 25 is screwed in from this position, the machine screw 2
5 abuts on the unthreaded hole 5 and is screwed in while forming a screw thread by the machine screw 25. This resin material is made of polyacetal resin or polyamide resin. Since the screwless hole 5 has almost the same diameter as the effective diameter of the screw 25, it can be easily screwed in. Moreover, the machine screw 25 is made of the elastic material of the resin material. The small screw 25 is tightened by the force, and the loosening of the screw can be prevented. A tapping screw may be used as the small screw 25, and in the case of a tapping screw, it is preferable that the hole 5 without a screw has a diameter slightly smaller than the effective diameter.

Next, another embodiment is shown in FIGS. The resin nut B shown in FIGS. 4 and 5 has a shape in which the bushing portion 4 of the resin nut A described above is removed, and other configurations are the same. That is, it is used when the bushing portion 4 is unnecessary, and the operation and effect of screwing and loosening prevention are the same as those of the resin nut A.

[0009]

As is apparent from the above description, the present invention is
From the outer diameter of the screw that extends from the nut part that has the tool engaging part on the outer peripheral surface and the tightening surface formed on the nut part
A bushing with a slightly larger inner diameter is integrally molded with a resin material, and a hole diameter equal to or smaller than the effective diameter of a predetermined screw is provided at the center of the nut over the entire length.
A resin nut for spectacles having a single screw-free hole. According to this invention, since the unthreaded hole of the resin material is formed smaller than the outer diameter of the screw without tapering, the screw thread is uniformly formed by the small screw (or tapping screw) at the time of tightening. From the outer surface of the screw due to the elasticity of
The tightening force works evenly to prevent the screws from loosening. Also, this nut has a tightening surface
With this tightening surface, you can press the lens securely,
No large pressing force is required and the lens will not be damaged.
Yes. Further, since the bushing portion integrally formed does not require the conventional T-type washer, the workability of assembling is good, the assembling cost can be reduced, and the lens is prevented from being damaged. Moreover, the inner diameter of this bushing is
Since it is formed slightly larger than the diameter, this block can be
The tightening surface of the nut does not spread out
Can be firmly attached to the lens. Furthermore, if the hexagonal shape of the resin member is made the same as the size of the metal nut, many effects can be obtained, such as the conventional tool can be used as it is.

[Brief description of drawings]

FIG. 1 is a partially sectional front view of a resin nut A of the present invention.

FIG. 2 is a bottom view of FIG.

FIG. 3 is an explanatory view showing a tightened state using a resin nut A.

FIG. 4 is a partial sectional front view showing a resin nut B of another embodiment.

FIG. 5 is a bottom view of FIG.

FIG. 6 is an explanatory view showing a conventional tightened state.

[Explanation of symbols]

 1 Nut Part 2 Tool Engagement Part 3 Tightening Surface 4 Bushing Part 5 Screwless Hole 6 Inner Diameter A Resin Nut

Claims (1)

[Claims] And 1. A nut portion provided with a tool engaging portion on the outer peripheral surface, when extending from the clamping surface formed on the nut together
Slightly larger and bushing portion having an inner diameter integrally molded by a resin material, a small diameter hole diameter than the diameter or the effective diameter and the effective diameter of a given screw in the center of the nut portion than the outer diameter of the screw to
A resin nut for spectacles, characterized in that the same threadless hole is formed over the entire length .