Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Temples
Patent
1995-06-15
1998-11-10
Dang, Hung X.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Temples
351111, G02C 516, G02C 514
Patent
active
058351841
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a process for producing a spectacle side piece.
More particularly, the invention relates to a process for producing a spectacle side piece which is suitable for incorporating a mechanism for flexibly moving the side piece relative to the spectacle's frame.
Moreover, the invention refers to a side piece manufactured by means of such process.
The invention may be mainly applied in the field of eyewear manufacturing.
BACKGROUND ART
Many kinds of side pieces provided with devices allowing a resiliently or flexibly hinged movement are known in the art.
Italian utility model application No. 82530A/89 discloses a side piece of the resilient yielding type for eyewear frames.
Such side piece comprises a rod, in correspondence with one end of which a fiber sleeve is formed by means of an injection process; this sleeve is axially bored in order to house a per se known resilient yielding mechanism.
Generally, such mechanism comprises a cylindrical body, inside of which there is a metallic tie rod, one end of which may be articulated on the spectacle's frame, while the other end is fixed to an element which supports a spring placed between said cylindrical body and said element.
Beside the cylindrical body there is a hole suitable for allowing the resilient yielding device to be fastened to the side piece by means of a screw or a pin or of a suitable restrained joint.
This solution, which is schematically illustrated at FIG. 1, involves many disadvantages and drawbacks which are essentially due to remarkably high assembly times, as well as to a reduced mechanical stability and stiffness, since a major part of the side piece is not provided with a metallic core.
Furthermore, this implies relatively high manufacturing costs.
According to a second form of embodiment known in the art, which is schematically illustrated in FIG. 2, the side piece comprises a continuous metallic core, at one end of which a metallic box is welded, which houses a resilient yielding device including a metallic body, a tie rod and a spring.
The metallic body is generally fastened to the box by means of a screw.
The process of injecting synthetic material about the metallic core is carried out by holding the end of the metallic box and by then injecting the material; in this way the metallic box is left uncovered and at sight.
This solution implies a series of drawbacks and disadvantages too, which are mainly caused by the position of the metallic box which contains the resilient yielding device.
In fact, since the box is placed outside of the injected material, the welding between said box and the metallic core may yield and cause the side piece to be detached from the frame.
Furthermore, a certain wear of the galvanized portion may be noted, due to the contact of the same with the air.
In certain conditions the metallic core may further entirely detach itself from the injected material, and may be extracted from the latter.
Still, the resiliently yielding mechanism is generally fastened to the box by means of a screw, and this causes high costs and assembly time.
Furthermore, since the side pieces are then tumbled, the box containing the resiliently yielding mechanism should be protected from the tumbling rods of the tumbling apparatus; in order to carry out such protection, the metallic box is entirely covered by means of a sleeve made of a plastic material.
This implies a further waste of time and an increase of manufacturing costs.
It should also be noted that the whole resiliently yielding mechanism is in this case welded to the metallic core before the injection of the synthetic material.
Thus, in the case where there were some manufacturing scraps, these have a high cost, since the whole mechanism may not easily be recovered.
DESCRIPTION OF THE INVENTION
The present invention aims to obviate the disadvantages and drawbacks which are typical of the background art, and to provide, thus, for a process for manufacturing a side piece which is suitable for being provided with a resiliently yielding
REFERENCES:
patent: 2064604 (1936-12-01), Hempel
patent: 4848891 (1989-07-01), Lee
patent: 5165060 (1992-11-01), Huang
patent: 5185620 (1993-02-01), Cooper
Dang Hung X.
Libo Optical S.r.L.
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