Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Bridges
Patent
1990-07-17
1993-01-26
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Bridges
351140, B02C 502
Patent
active
051825872
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an eyeglass frame made of a material which is extremely difficult to work, for example, an NT alloy (shape memory alloy).
BACKGROUND ART
A conventional eyeglass frame of this type is disclosed in Japanese Patent Laid-Open No. Sho. 63-58213, as shown in FIGS. 8 and 9.
Referring to FIG. 8, one end of an end piece 106 which projects from a lens frame 101 is formed as an engagement tube 107, and pin holes 171 are formed in the engagement tube 107 and pin holes 182 are also formed in an engagement stem 181 which projects from the proximal end of a temple 108. The engagement stem 181 of the temple 108 is inserted into the engagement tube 107, and pins 172 are inserted through the commensurate pin holes 171 and 182 of the respective members, and the ends of the pins 172 are secured to the temple 108 by pinching as required. This state is shown in FIG. 8(A).
As shown in FIG. 8(B), after the distal end of the temple 108 has been inserted into the engagement tube 107, the temple 108 may be secured by press-fitting the engagement tube 107.
However, the above-described prior art has the problem that the temple 108 and the engagement tube 107 are difficult to drill or thread and costs increase. In particular, with a process utilizing the threading of an NT alloy (a nickel titanium alloy) material, it is impossible to mass-produce eyeglass frames in practice.
In particular, if parts are damaged when eyeglass parts are fused with an eyeglass frame, repair is difficult.
The NT alloy material also has the problem that, when subjected to cutting such as threading or drilling, the material is easily damaged.
DISCLOSURE OF THE INVENTION
The object of the present invention is to solve the above-described problems experienced with the prior art. An anti-rotation groove is formed at one end of an NT-alloy member to be joined, and an engagement tube having an inner threaded periphery is fixed to the periphery of the groove, joined with an engagement portion, and secured in position by a screw. With this arrangement, since it is not necessary to directly thread the eyeglass frame made of a material which is extremely difficult to work, for example, an NT alloy, such eyeglass frames can be easily manufactured and the mass production thereof is enabled.
In addition, if eyeglass parts of various designs which differ in length or thickness are prepared as bridges or bars to be secured to rims, eyeglass parts of various designs which differ in color, thickness or size can be supplied in compliance with the demands of various users. It is also possible to freely select the hardness of a front.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front elevational view of an eyeglass frame according to the present invention;
FIG. 2 is an exploded explanatory view of the eyeglass frame according to the present invention;
FIG. 3 is an enlarged view of the connection between a bar and a rim of the eyeglass frame according to the present invention;
FIG. 4 is a partial enlarged view of a side joint according to the present invention;
FIG. 5 is a perspective view of a bridge of the eyeglass frame according to the present invention;
FIG. 6 is a cross-sectional view of a first embodiment of the eyeglass frame according to the present invention;
FIG. 7 is a side view of a second embodiment of the eyeglass frame according to the present invention;
FIG. 8(A) and 8(B) are an explanatory view of a prior art; Part (A) is a view illustrating connection utilizing pins, while Part (B) is a view illustrating connection utilizing pinching; and
FIG. 9 is a side view of an eyeglass frame according to the prior art.
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front view of an eyeglass frame according to the present invention, and the eyeglass frame is indicated generally at 1. The eyeglass frame 1 comprises a pair of right and left rims 2, and the rims 2 support lenses 3, respectively. The
Bovernick Rodney B.
Murai Co., Ltd.
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