JPS6392918A - Spectacles frame parts made of fiber reinforced resin - Google Patents

Abstract

PURPOSE:To reduce the weight of titled parts and to permit mass production thereof by providing a pair of upper and lower takes to both terminals of an open ring-shaped lens holding frame and using a short fiber reinforced thermoplastic resin to form the moldings thereof. CONSTITUTION:A metallic mold having a cavity shape is prepd. Pellets of '6.6 Nylon(R)' preliminarily contg. 30wt% short carbon fibers having 7mu diameter and 0.3mm average length are used and are molded at about 10sec speed per piece by an ordinary injection molding machine. The strength of the moldings is improved when the moldings are immersed for one hour into water kept at 90 deg.C. The integral moldings obtd. in such a manner is as slender as about the frames made of metals and compare favorable with the metallic frames. Through-holes are drilled to the endpieces 2a, 2b of the resulted molding a and screw 4 is screwed into the holes to fasten the endpieces 2a, 2b to each other by screwing. The moldings are thereafter assorted to a pair of the right and left frames and both are mounted to a browbar. The frame parts are com pleted by joining hinge pieces to both ends of the browbar.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synthetic resin eyeglass frame component having a slender lens holding frame.

Until now, eyeglass frames have been made of metals, synthetic resins (e.g., celluloid, cellulose acetate, epoxy resins, nylon), tortoiseshell, and the like. Metal is preferred because it can be made into a slender body, synthetic resin is preferred because it is lightweight, and tortoiseshell is preferred because it is a natural product and is valuable because it is rare. Recently, however, there has been an increasing demand from wearers for slimmer synthetic resin eyeglass frames. However, when conventional synthetic resin eyeglass frames are made thin, they lack strength or stretch easily, making it easy for the lenses to come off, making it impossible to commercialize them.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an eyeglass frame component that is made of synthetic resin, is lightweight, and has a lens holding frame that is as slender as a metal frame. Therefore, the inventor of the present invention endeavored to improve the synthetic resin, and found that the fiber-reinforced synthetic resin has sufficient strength even when made thin, and does not stretch even when made thin, making it easy for lenses to come off. It was discovered that the shortcomings could be resolved. However, the structure of conventional synthetic resin lens holding frames is a closed ring shape that almost matches the external shape of the lens, and conventionally, the softening and elongation of synthetic resin when heated is used to place the lens into the holding frame. Ta.

However, when using synthetic resin reinforced with fibers, there is almost no elongation when heated, so it is difficult to insert the lens into the holding frame, and if you force the lens into the holding frame, the corners of the lens (especially in the case of glass lenses) may damage the holding frame. It turns out. Also, when such a ring-shaped object is injection molded, a weld line is created in the middle of the ring where resin flowing from two directions collides, making it easy to break at that point, but when fiber reinforced resin is used,
This tendency became more pronounced, and I learned that it was not practical to mold the lens holding frame into a closed ring shape. As a result of further research, we came up with the idea of making the lens holding frame an open ring shape even if it is a resin frame, and then closing the ring with a screw. Therefore, we decided to provide a pair of upper and lower blow tips at both ends of the open ring-shaped lens holding frame, but we learned that when the lens holding frame and the blow tips are glued or heat-sealed, the joint surfaces tend to peel off easily. In particular, I learned that it is difficult to bond and heat-seal synthetic resins when they contain fibers. Therefore, it was decided to mold the lens holding frame and the blow hole in one piece, and it was found that when molded together, there are fibers that lie across both the lens holding frame and the blow hole, further increasing the bonding strength between the two. In addition, considering production efficiency, injection molding is the most preferable method, so thermoplastic resin is suitable as the synthetic resin.
I learned that short fibers are suitable as fibers.

Therefore, the present invention is an integrally molded product comprising an open ring-shaped lens holding frame and a pair of upper and lower blow tips connected to both ends of the frame, and is characterized in that the molded product is made of short fiber-reinforced thermoplastic resin. To provide slender eyeglass frame parts.

The short fibers used in the present invention include glass fiber, carbon fiber, boron fiber, silica fiber, quartz fiber, Al2
Examples include whiskers and inorganic fibers such as O2, MgO, W, and SiC, and organic fibers such as polyamide. These short fibers are preferably sized in advance with nylon, epoxy resin, silicone, etc. in order to improve their compatibility with synthetic resins. The short fibers preferably have a diameter of 5 to 15 microns and a length of 0.05 to 1 cm. If it is too thick, the resin will become brittle, and the surface of the molded product will not be glossy. If it is too long, it will be difficult to mold, and the orientation and distribution will be biased, resulting in uneven strength, which is not preferable. Short fibers are kneaded into thermoplastic resin before molding. Suitable thermoplastic resins include polybutylene terephthalate, polyethylene terephthalate, ABS
, AS resin, PPS, polyacetal, various nylons,
High density polyethylene, polypropylene, polysulfone,
Examples include polycarbonate and modified PPO.

Among these, 6,6-nylon and 6-nylon are preferred.

The mixing ratio of short fibers and synthetic resin is 100% by weight of the mixture.
10 to 40% by weight of short fibers, preferably 20 to 3% by weight
It is 0% by weight. If it is less than 10% by weight, the reinforcing effect will not be significant, and if it is more than 40% by weight, the flow of the resin will be poor during injection molding, making it impossible to obtain a slender shape. In addition, a phenomenon of embrittlement is observed in response to external forces such as bending, and the material becomes susceptible to breakage due to slight deformation.

The lens holding frame in the present invention may be a right and left independent holding frame, or the left and right holding frames may be integrally connected by a bridge or a "crossing". However, in both cases, the holding frame has an open ring shape, and a pair of upper and lower blow holes are integrally molded at both ends of the holding frame. The blow hole is used to close the open ring-shaped holding frame, and the upper and lower blow holes are tightly attached to each other by passing a screw through the hole penetrating the upper and lower blow holes, thereby closing the holding frame and closing the lens. Tighten the area around the lens to prevent it from coming off the holding frame.

Therefore, the blow chi is also accompanied by a hinge piece for attaching the temple, an armor chi with a hinge piece, an armor chi for attaching the hinge piece, and members for attaching decorative parts such as a cocoon. Good too.

The lens holding frame of the present invention is characterized by being slender,
For example, the cross-sectional dimension can be reduced to about 1.2 fin diameter at the narrowest point. Of course, the cross-sectional dimensions do not need to be the same all around the holding frame, and may be made thicker toward the top. The cross-sectional shape does not have to be limited to a circle; it can be convex, O, M,
It may also be △, mouth, O, etc.

The present invention will be explained below with reference to Examples.

(Example 1) FIG. 1 is a perspective view of parts of this example, and FIG. 1A is a sectional view taken along the line X-Y in FIG. 1. As can be understood from the figure, this component consists of a substantially C-shaped lens holding frame 1, an upper blow tip 2as and a lower blow tip 2b connected to both ends of the lens holding frame 1, and is integrally molded. 3a and 3b are protrusions for attachment to the bridge.

The cross-sectional dimension of the lens holding frame I is the width in the depth direction over the entire circumference! ='l mm, thickness tl=l, 2n+, groove depth t2=o, 5 pieces.

A mold having the cavity shape shown in Fig. 1 was prepared, and a 6,6-nylon pellet containing 30% short flame fibers with a diameter of 7 μm and an average length of 0.3 mm as the resin was used. The eyeglass frame parts shown in FIG. 1 were molded using an ordinary injection molding machine at a speed of about 10 seconds per piece. After molding,
The strength improved when immersed in water at 90°C for 1 hour. The integrally molded product thus obtained was as slender as a metal frame, and had almost the same strength as a metal frame, and had sufficient strength for practical use. In the obtained molded product, holes are drilled through the blow tips 2a and 2b, and screws 4 are screwed into the holes to screw the blow tips 2a and 2b together. Therefore, a metal pipe member for passing the screw 4 therethrough may be inserted into the blow end 2b, and a female threaded pipe member for receiving the male screw 4 may be inserted into the blow end 2a, or they may be insert-molded at the same time. Otherwise, simply drill a through hole that is slightly thinner than the screw diameter, and then use a self-tapping screw to
a and 2b may be screwed on.

The parts shown in Figure 1 are then aligned as a pair on the left and right and attached across the two (not shown), with hinge pieces (not shown) attached to both ends of the crossover.
(not shown) to complete the front frame.

(Example 2) In this example, as shown in FIG. 2 (perspective view), a component is formed in which left and right lens holding frames 1 are integrally connected via a bridge portion 1a. Here, the upper blow tip 2a also serves as an armor tip, and the lower blow tip 2b fits into the recess of the upper blow tip 2a and is hidden.

The resin used was 6-nylon containing 40% by weight of short flame fibers with a diameter of 6.5 μm and an average length of 0.3 mm.
It was a pellet, and injection molded in the same manner as in Example 1 to obtain a slender front frame. This front frame is completed by attaching the hinge pieces.

(Example 3) In this example, the basic shape is the same as in Fig. 2, but the part surrounded by the dotted line in Fig. 2 has a shape as shown in Fig. 3 (perspective view). . In other words, the upper blow tip 2a also serves as an armor tip, and moreover, it integrally has the hinge piece 2aI. The resin used was the same as in Example 1, and a slender front frame was obtained by injection molding in the same manner.

(Embodiment 4) In this example, the basic shape is the same as that in FIG. 2, but a part surrounded by a dotted line in FIG. 2 has a shape as shown in FIG. 4 (perspective view). In other words, the ring-closing function part of the lens holding frame 1 is generally referred to as a "split tip", and the upper blow tip 2a has a hinge piece 2a+ integrally, and the lower blow tip 2b also has a hinge piece. 2b. A temple-side hinge piece (not shown) is inserted between the hinge piece 2a+ and the hinge piece 2b+, and both are pivotally connected by the hinge screw 5.

As described above, according to the present invention, the frame is as slender and strong as a metal frame, yet light like a resin frame, has a large degree of freedom in design, can be mass-produced, and can be manufactured at low cost. It is possible to obtain an eyeglass frame component having a lens holding frame that does not have weak points due to weld lines as seen in resin frames.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a part molded in Example 1 of the present invention. FIG. 1A is a sectional view taken along the line X-Y in FIG. 1. FIG. 2 is a perspective view of a part molded in Example 2. FIG. 3 is a partially enlarged perspective view of a part molded in Example 3. FIG. 4 is a partially enlarged perspective view of a part molded in Example 4. 1...Lens holding frame 2a...
・・・・・・・・・Upper blow Satoshi 2b・・・・・・・・・・
・・Lower blow tip la・・・・・・・Bridge part 4・・・・・・・・・・・Lens holding frame ring closing screw 4121 Procedural amendment November 1988 1'/day

Claims (1)

[Claims] A slender eyeglass frame component, which is an integrally molded product consisting of an open ring-shaped lens holding frame and a pair of upper and lower blow tips connected to both ends of the frame, and the molded product is made of short fiber-reinforced thermoplastic resin. .