JPH0114009Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the structure of a hinge screw that connects the temple and front of eyeglasses in a foldable manner.

[Prior Art] Conventionally, as shown in FIGS. 3 and 4, hinge 1
0 is a joint arm hinge piece 11 and a metal frame hinge piece 1
2 are inserted into each other to communicate with each other through piece holes 13 and 14.
A metal set screw 15 is inserted and screwed together.
However, in the conventional set screw 15, the male threaded portion cut at the tip is inserted into the piece hole 1 of the lowest frame hinge piece 12.
Since the screw is only screwed into the female thread cut in the section a, screwing is unstable, and slight loosening of the screw causes the screw to come off.

In order to improve this point, the present applicant did not cut a female thread in the bridge hole of the hinge bridge, but instead provided the hinge bridge with an outer diameter that corresponds to the diameter of the bridge hole and a length that corresponds to the depth of the connected bridge hole. A plastic pipe with one end sealed is inserted into the connecting piece hole of the arm hinge piece and the frame hinge piece, and has a thread diameter slightly larger than the inner diameter of this pipe and a length corresponding to the above pipe length. , a hinge dowel structure configured to connect an arm hinge piece and a frame hinge piece by screwing a metal dowel screw threaded over the entire length into the pipe from the open end of the pipe. devised the invention and applied for registration of a utility model (application filed in 1982
125565).

The above-mentioned joint screw structure of the hinge is an excellent structure that eliminates the loosening and loosening of conventional screws and prevents the hinge from wobbling or flapping. It was found that some wear occurred.

[Purpose of the invention] The present invention improves the above-mentioned conventional mating screw structure.
Moreover, it is an object of the present invention to provide a hinge screw structure in which folding of the hinge is smooth and durable.

[Structure of the invention] The characteristics of the invention are that the arm hinge piece and the frame hinge piece are molded from plastic, and the hole of the hinge piece is not threaded internally, but is threaded to match the diameter of the hole. A metal pipe with an outer diameter and a length corresponding to the depth of the connected piece hole, with a female thread cut on the inside,
It is inserted into a hole where an arm hinge piece and a frame hinge piece communicate with each other, and a metal set screw is screwed into the female thread of this pipe to connect the arm hinge piece and frame hinge piece.

[Example] Next, an example of the present invention will be described in detail based on the drawings.

In FIGS. 1 and 2, the same reference numerals as in FIGS. 3 and 4 indicate the same components. The arm hinge piece 11 and frame hinge piece 12 of the present invention are molded from plastic. No internal threads are cut in the piece holes 13 and 14, and a metal pipe 20 is inserted into the piece holes 13 and 14. This pipe 20
The length l is slightly shorter than the depth P of the communicating piece holes 13 and 14 by the head of the set screw 15. Further, the outer diameter d of the pipe 20 is 1.7 mm in this example, which is approximately equal to the diameter D of each of the piece holes 13 and 14, so that the pipe 20 will not fall out when inserted into the piece holes 13 and 14. A female thread is cut on the inside of the pipe 20 over almost the entire length, and one end of the thread is sealed, and this sealing surface is used to prevent rotation of the pipe 20 when a set screw 15 (described later) is screwed into the pipe 20. A detent groove 21 is formed. A metal set screw 15 is screwed into the female thread of the pipe 20.

A method of assembling a hinge with such a configuration will be explained. First, the arm hinge piece 11 and the frame hinge piece 12 are fitted into each other, and then a metal pipe 20 is inserted from below into the piece holes 13 and 14 that communicate with each other. Next, insert a jig such as a screwdriver into the locking groove 21 on the sealing surface of the pipe 20 to fix the pipe 20, and then use another screwdriver to tighten the metal set screw 15 from the open end of the pipe 20. Screw it. As a result, the set screw 15
is screwed into the female thread of the pipe 20, and the pipe 20 and the dowel screw 15 are integrated, so that the dowel screw 15 is difficult to loosen and does not come off. In addition, the resistance force when folding the hinge is the frictional force between the hinge piece hole and the pipe, but this resistance force is extremely small because it is the frictional force between the plastic and the metal, making it possible to fold the hinge smoothly. can be done. Furthermore, since the pipe that forms the central axis is made of metal, the pipe will not wear out even if the glasses are used for a long period of time, and the hinges will not rattle or flap.

In addition, in the above example, one end of the metal pipe is sealed and a detent groove is formed on the sealing surface, but one end of the pipe does not necessarily have to be sealed, and the cross section of one end may be square. It is also possible to form a rectangular recess in the hinge piece and insert one end of the pipe into the recess to prevent the pipe from rotating.

[Effects of the invention] As described above, according to the invention, the arm hinge piece and the frame hinge piece are molded from plastic, and a female thread is installed inside instead of the conventional female thread cut into the piece hole. By inserting a cut metal pipe into this piece hole and screwing a metal dowel screw into the female thread of this pipe to integrate the pipe and dowel screw, the glasses can be used for a long period of time. , screws are less likely to loosen, screws do not come off, and the hinges do not rattle or flap due to the friction between the plastic and metal, and since the central pipe is made of metal, it does not wear out over a long period of time. It has an excellent effect of allowing the hinge to be folded smoothly.

[Brief explanation of the drawing]

Fig. 1 is an exploded front view of the main parts of the hinge set screw according to the embodiment of the present invention, Fig. 2 is a front view of the main parts broken and assembled, and Fig. 3 is an exploded perspective view of the main parts of the hinge set screw of the conventional example. FIG. 4 is an assembled perspective view thereof. 10: hinge, 11: arm hinge piece, 12: frame hinge piece, 13, 14: piece hole, 15: metal set screw, 20: metal pipe, 21: anti-rotation groove.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A plastic arm hinge piece and a plastic frame hinge piece are inserted into each other and communicate with each other in the piece hole, which has an outer diameter corresponding to the diameter of this piece hole. Insert a metal pipe with a diameter and a length corresponding to the depth of this communicating piece hole and a female thread cut on the inside, and screw a metal set screw into the female thread of this pipe to complete the process described above. A hinge assembly screw structure, characterized in that it is configured to connect an arm hinge piece and the frame hinge piece. (2) The hinge dowel structure according to claim 1, wherein one end of a metal pipe is sealed, and a groove for preventing rotation of the pipe is formed on the sealing surface.