JPH11231266A - Nut for clamping spectacle component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bolt and a nut for spectacles which can quickly be engaged and are hard to loosen for a screw device used to clamp a spectacle lens and a spectacle component. SOLUTION: A nut side is equipped with an inside member 2 which is made of synthetic resin and has a conic external surface 11 and an outside member 3 which has a conic internal surface 12 coming into sliding contact with the conic external surface 11. The inside member 2 has a flange part 4 on its large- diameter side and a through hole 5 into which a screw is inserted and is reducible in diameter by a slotted groove 6. The outside member 3 has a female screw part 14 which engages the screw 21 in the center of the bottom surface of the conic internal surface 12. The distance R formed between the flange part 4 of the inside member and the flange part end surface of the outside member when the inside member 2 is mounted on the outside member 3 is less than the diameter S formed between the small-diameter end surface 10 of the inside member and the stepped surface 13 of the outside member. When the outside member 3 is threadably advanced, the screw 21 intrudes into the through hole 5 of the inside member to prevent the nut from loosening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut used to fasten a spectacle lens and a spectacle component.
In particular, the present invention relates to a nut having a structure suitable for assembling frameless glasses.

[0002]

2. Description of the Related Art Borderless spectacles are bridged to spectacle lenses.
It is assembled by fastening eyeglass parts such as box feet and armor.
Usually, bolts and nuts are used for fastening the spectacle lens and the spectacle parts. The assembling method is to provide a mounting hole having a circular cross section in the eyeglass part and the eyeglass lens, insert a screw into this mounting hole, screw the nut while fixing the head of the screw with a screwdriver, and tighten the screw. is there.

[0003] As a structure for preventing the nut of the frameless spectacles after being assembled in this way from loosening, there are a structure using a spring washer and a structure in which the nut is doubled.
However, in the former structure, the spectacle lens may be damaged due to stress concentration at the time of fastening, and cannot be strongly fastened, and loosening cannot be completely prevented. The latter structure requires two nuts to be screwed in, which is cumbersome and inefficient.

Therefore, as a means for solving such a problem, there is a nut as shown in FIG.
649). This nut 24 is used for the spectacle lens 15
A shaft portion 25 which can be inserted into the round hole 16 and a flange portion 26 having a larger diameter than the shaft portion 25 are formed. The shaft portion 25 is formed with a shaft hole 27 for screwing the round screw 21. The end surface 28 following the shaft portion is formed in a concave shape.

In order to fasten the bridge 29, which is one of the spectacle parts, with the nut, the shaft part 25 of the nut is inserted into the round hole 16 of the spectacle lens 15, and the mounting hole 30 of the bridge 29 and the center of the seat plate 31. The round screw 21 is inserted into the hole 32, and its tip is screwed into the shaft hole 27 of the nut mounted on the round hole of the spectacle lens, so that the concave end surface 28 of the flange portion 26 of the nut is pressed against the back surface of the spectacle lens 15. As described above.

[0006] In this nut, since the round screw is screwed into the shaft hole of the nut while cutting the screw, a large frictional force acts between the round screw and the nut. A tensile force acts in the axial direction to increase the frictional force between the screw and the nut, thereby preventing the nut from loosening.

[0007]

However, since this nut is to screw a round screw while cutting a screw into its shaft hole while preventing the nut from rotating together at the time of fastening, a strong force is required for screwing. Therefore, the burden on the worker is large. In addition, a large-diameter round hole must be formed in the spectacle lens to receive the shaft of the nut, which causes a problem in the strength of the lens.

According to the present invention, a spectacle lens fastening nut which can reduce the mounting hole of the spectacle lens, can quickly assemble the spectacle lens and the spectacle component, hardly loosens after assembly, and can be fastened with a small force. The challenge is to provide

[0009]

The nut for fastening eyeglass parts according to the first aspect has an inner member made of synthetic resin having a conical outer surface, and a conical inner surface slidingly contacting the conical outer surface. An outer member 3 and an inner member 2
Has a flange portion 4 on the large diameter side and a through hole 5 at the center for inserting a screw 21 to be attached to the spectacle lens and the spectacle component. The inner member 2 has a groove 6 formed in its radial direction. The outer member 3 is provided with an operation portion 7 for screwing the outer member 3 on the outer surface thereof, and a female screw portion 14 screwed with the screw 21 at the center of the bottom surface of the conical inner surface 12 thereof. When the inner member 2 is mounted on the outer member 3, the distance R formed between the flange portion 4 of the inner member and the flange-side end surface of the outer member is reduced by the small-diameter side end surface 10 of the inner member and the step surface of the outer member. 13. The distance S is smaller than the distance S formed between the first and second electrodes.

[0010]

When the nut 1 of the present invention is loosely mounted on the protruding end of the screw 21 mounted on the spectacle lens and the spectacle parts, the small-diameter side end surface 10 of the inner member and the step surface 13 of the outer member are separated by a distance S. The flange portion 4 of the inner member and the inner member side end surface of the outer member face each other at a distance R (see FIG. 4). In this state, when the operation member 7 of the outer member is operated to stop the screw 21 from rotating and the outer member 3 is screwed, the flange-side end surface of the outer member hits the flange portion 4 of the inner member, and the spectacle lens and the spectacle lens It is fastened with the member pressed against it. At this time, a slight gap remains between the small-diameter side end surface 10 of the inner member and the step surface 13 of the outer member.

Further, when the outer member 3 is advanced, the conical inner surface 12 of the inner member is reduced in diameter by the conical outer surface 11 of the outer member. The inner member is screwed 2 while biting into the external thread.
1 to prevent the outer member 3, that is, the nut 1, from being loosened.

[0012]

1 and 2 show an embodiment of a nut according to the present invention. Nut 1 of this embodiment
Includes an inner member 2 made of synthetic resin and an outer member 3 made of metal. The inner member 2 has a frusto-conical shape having a flange portion 4 on the large diameter side, and a through hole 5 located on the center line thereof and a groove 6 extending radially from the through hole 5.
Is provided. The outer shape of the outer member 3 is a shape in which a hexagonal operation part 7, a cylindrical part 8 slightly smaller in diameter than the operation part 7, and a hemispherical part 9 smaller in diameter than the cylindrical part 8 are connected from the upper end to the lower end. At the center of the operation member 7 of the outer member, there is provided a conical hole 12 that slides on the conical surface 11 of the inner member.
On the bottom surface of the conical hole, there is provided a step surface 13 facing the small-diameter side end surface 10 of the inner member at a distance S, and at the center of the bottom surface, there is provided a female screw portion 14 screwed with a round screw 21 described later. I have. The inner member-side end surface of the outer member 3 and the lower surface of the flange portion of the inner member face each other with a distance R therebetween. This distance R is provided smaller than the distance S.

FIGS. 3 and 4 show the use state of the nut of the present invention. At the lens surface side of the round hole 16 provided in the lens 15 for frameless glasses, the mounting holes 19 and 20 of the pad 17 and the bridge 18 are arranged so as to match the round hole 16, and these holes 16 and 19 are arranged. , 20 with round screw 21
To make its tip protrude from the back surface of the spectacle lens 15. The through hole 5 of the inner member 2 is attached to the protruding end of the round screw 21 with the flange portion 4 of the inner member facing the back side of the lens 15. The female screw portion 14 of the outer member 3 is loosely screwed into the tip of the round screw 21 protruding from the through hole 5.

The state at this time is shown in FIG.
The flange portion 4 of the inner member 2 and the operating portion 7 of the outer member 3 face each other at a distance R, and the small-diameter side end surface 1 of the inner member 2
0 and the step surface 13 of the outer member face each other at a distance S. The distance R is set smaller than the distance S. When a screwdriver is inserted into the head of the round screw 21 and the operation of the outer member 3 is screwed while the rotation of the round screw is stopped, the conical inner surface 12 of the inner member is reduced in diameter by the conical outer surface 11 of the outer member. As a result, the diameter of the inner member 2 gradually decreases, and the inner wall of the through hole 5 bites into the male screw portion of the round screw 21. Then, the end face on the flange portion side of the outer member hits the flange portion 4 of the inner member, and the spectacle lens and the spectacle member are fastened in a pressed state. At the time of this fastening, a small gap is left between the small-diameter side end surface 10 of the inner member and the step surface 13 of the outer member, and the inner wall of the through hole 5 of the inner member is deeply penetrated into the male screw portion of the screw 21. Thus, the inner member holds the screw 21 and the loosening of the outer member 3, that is, the nut 1, is prevented.

[0015]

As described above, according to the nut of the present invention, since the inner member bites into the screw inserted into the spectacle lens and the spectacle component by the screwing operation of the outer member, a large friction is generated between the screw and the nut. The force acts, the frictional force between the screw and the nut increases, and the nut can be prevented from loosening.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a nut.

FIG. 2 is an exploded sectional view of a nut.

FIG. 3 is a perspective view showing a use state of a nut.

FIG. 4 is a sectional view of a main part showing a use state of a nut.

[Explanation of symbols]

 2 inner member 3 outer member 5 through hole 6 slot 7 operating section 10 small diameter side end surface 11 conical surface 12 conical hole 13 step surface 14 internal thread 21 round screw R distance S distance

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[Procedure amendment]

[Submission date] April 16, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a perspective view showing a nut.

FIG. 2 is an exploded sectional view of a nut.

FIG. 3 is a perspective view showing a use state of a nut.

FIG. 4 is a sectional view of a main part showing a use state of a nut.

FIG. 5 is a sectional view of a main part showing a conventional nut and its use state.

[Description of Signs] 2 Inner member 3 Outer member 5 Through hole 6 Sliding groove 7 Operating part 10 Small diameter side end surface 11 Conical surface 12 Conical hole 13 Step surface 14 Female screw part 21 Round screw R distance S distance

Claims (1)

[Claims] An inner member (2) made of synthetic resin having a conical outer surface (11), and an outer member (3) having a conical inner surface (12) slidingly contacting the conical outer surface (11). The inner member
(2) has a flange portion (4) on the large diameter side and a through hole (5) through which a screw (21) to be attached to an eyeglass lens and eyeglass parts is inserted at the center, and the inner member (2) is The diameter can be reduced by the sliding groove (6) formed in the radial direction,
The outer member (3) has on its outer surface an operating portion (7) for screwing the outer member (3), and a female screw portion (14) screwed to the screw (21) at the center of the bottom surface of the conical inner surface (12). )
When the inner member (2) is attached to the outer member (3), the distance (R) formed between the flange (4) of the inner member and the flange-side end surface of the outer member is the small-diameter end surface of the inner member. A spectacle part fastening nut, characterized in that the distance (S) formed between the step (10) and the step surface (13) of the outer member is smaller than the distance (S).