JPH06308432A - Stopper nut for spectacles - Google Patents

Abstract

PURPOSE:To provide the inexpensive nut which has a stopper function and does not damage lenses. CONSTITUTION:This stopper nut is constituted by integrally forming a resin member 3 having a threadless nut hole 4 of the same diameter as the effective diameter of prescribed internal threads 2 or the diameter smaller than the effective diameter on the rear end of a metallic nut 1 formed with the internal threads 2 concentrically with the metallic nut 1. Since the metallic nut 1 is not inserted, the sufficient tightening strength in an axial direction is assured and since the threadless hole 4 of the resin member 3 is made smaller than the outside diameter of the threads, the thread ridges are formed by a machine screw (or tapping screw) at the time of tightening and the outside surface of the screw is tightened by the elasticity of the resin material. The loosening of the screw is thus prevented. The need for the conventional T-shaped washer is eliminated and the workability of assembly is improved and the cost of assembly is reduced.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Generally, in the case of fixing a lens to a metal member in a frameless frame type eyeglass, after fitting a T-shaped washer 31 made of a soft material into the mounting hole 22 of the lens 21 from both sides 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]

To achieve this object, a resin having a threadless hole having a diameter equal to or smaller than the effective diameter of the female thread is formed at the rear end of a metal nut having a predetermined female thread formed therein. It is a locking nut in which a member is formed concentrically and integrally with the metal nut.

[0005]

[Function] Since the metal nut is inserted, the tightening strength in the axial direction is sufficiently secured, and the unthreaded hole of the resin member is smaller than the outer diameter of the screw, so a small screw (or tapping screw) is used when tightening. The thread is formed by this, and further, the elasticity of the resin material can tighten the outer surface of the screw to prevent the screw from loosening. Also, the conventional T-type washer is not required.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below with reference to the drawings. FIG. 1 shows a sectional view of a lock nut A of the present invention. Reference numeral 1 in the figure is a hexagonal nut made of metal, and a predetermined female screw 2 is formed at the center thereof. A resin member 3 having an external hexagonal shape (FIG. 2) is extended at the rear end of the metal nut 1 and is integrally molded so as to cover the metal nut 1. At the center of the resin member 3, there is a screwless hole 4 having the same size as the effective diameter of the female screw 2 (or a screwless hole 4 having a diameter slightly smaller than the effective diameter).
It is formed concentrically with. Further, a bushing portion 5 extending from the resin member 3 is formed at the front end of the metal nut 1, and an inner diameter 6 of the bushing portion 5 is formed to be slightly larger than the root diameter of the female screw 2 and is concentric with the metal nut 1. It is integrally molded into a shape. The loosening prevention nut A can be easily manufactured by a so-called insert molding method in which a preprocessed metal nut 1 is set in a molding die and a resin material is injected.

The lock nut A having this structure is most suitable for fixing the lens of the frameless glasses. As shown in FIG. 3, the bushing portion 5 of the locking nut A is inserted into the mounting hole 22 of the lens 21 to hold the resin member 3 (hexagonal outline portion), and the flat washer 23 and the metal member 24 (for example, frame metal fittings). A small screw 25 made of metal inserted into the screw is screwed into the female screw 2 of the nut A, and when the screwing is further continued, the tip of the small screw 25 abuts the unthreaded hole 4 of the resin member 3 and the screw thread Is screwed in while molding. The resin member 3 is made of polyacetal resin or polyamide resin. Since the screwless hole 4 has almost the same effective diameter as the female screw 2, it can be easily screwed in, and the machine screw 25 is used for the resin member 3 The small screw 25 is tightened by the elastic force of, and the loosening of the screw can be prevented. A tapping screw may be used as the small screw 25. In the case of a tapping screw, it is preferable that the screwless hole 4 has a diameter slightly smaller than the effective diameter.

Next, another embodiment is shown in FIGS. The lock nut B shown in FIGS. 4 and 5 has a shape in which the bushing portion 5 of the lock nut A is eliminated, and other configurations are the same. That is, it is used when the bushing portion 5 is unnecessary, and the operation effect of screwing and locking is the same as that of the locking nut A. Further, in another embodiment shown in FIGS. 6 and 7, the lock nut C is provided with a fixing groove 12 on the outer periphery of the metal nut 11, and the operation effect of screwing and lock is the lock nut A and the lock nut. It is equivalent to the lock nut B. Further, in these examples, the outer surface shape of the resin member 3 may be a shape obtained by cutting the two surfaces 13 as shown in FIG. 7 or another polygonal shape, and a shape with which a tool can be engaged at the time of tightening is preferable.

[0009]

As is apparent from the above description, the present invention is
A locking member formed by concentrically and integrally forming a resin member having a screwless hole of the same diameter as the female screw or a diameter slightly smaller than the effective diameter at the rear end of the metal nut formed with a predetermined female screw. It is a nut. According to this invention,
Since a metal nut is inserted, sufficient tightening strength in the axial direction is ensured, and since the unthreaded hole of the resin member is smaller than the outer diameter of the screw, the screw thread can be tightened with a small screw (or tapping screw) when tightening. Is formed,
The elasticity of the resin material allows the screw to be tightened from the outer surface to prevent the screw from loosening. Further, since the integrally formed bushing section eliminates the need for 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. 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 front sectional view of a locking nut A according to the present invention.

FIG. 2 is a bottom view of FIG.

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

FIG. 4 is a front sectional view showing a lock nut B according to another embodiment.

FIG. 5 is a bottom view of FIG.

FIG. 6 is a front sectional view showing a locking nut C according to another embodiment.

FIG. 7 is a bottom view of FIG.

FIG. 8 is an explanatory view showing a conventional tightened state.

[Explanation of symbols]

 1 Metal nut 2 Female thread 3 Resin member 4 Hole without screw 5 Bushing part 6 Inner diameter A Locking nut

Claims (1)

[Claims] 1. A resin member having a screwless hole having a diameter equal to or smaller than the effective diameter of the female screw at the rear end of the metal nut having a predetermined female thread formed concentrically and integrally with the metal nut. A locking nut for eyeglasses characterized by being formed.