Patent Application
20050251960
The present invention relates to a screw-less hinge for spectacles using a single metal material for the entire set of spectacles excluding some spectacles parts, such as lenses, engagement rods (temple ends), and nose pads, the hinge having a mechanism for allowing each temple to turn with respect to a corresponding lug and preventing play of the temple, in both an opened state and a closed state.
A pair of spectacles consists of left and right lenses; a rim which supports the paired lenses at their peripheral edges and serves as a main body of a spectacle frame; and other parts such as nose pads, temples, and engagement rods (temple ends) which engage the nose, ears, etc., of a person who wears the spectacles.
In such rim-type spectacles, lugs are brazed to opposite outer sides of the rim, and temples are connected to the corresponding lugs by means of hinges to thereby enable the temples to be folded when the spectacles are not used. Incidentally, turning motion of the temples with respect to the lugs preferably involves resistance of a proper degree rather than no resistance. In the field of spectacles, the degree of resistance for turning motion of the temples with respect to the lugs is called resisting characteristic.
In order to attain a wider field of view and a lighter weight as compared to those attained with rim-type spectacles, there have been provided rim-less-type spectacles in which the spectacle frame is formed without use of the rim. In such rim-less-type spectacles, in order to cope with demand for weight reduction to the greatest possible extent, frames have been formed of a thin wire of metal or the like, lugs have been attached directly to lenses, or lugs have been improved so as to enable turning motion of temples without use of hinges.
An example structure for enabling turning motions of temples relative to lugs without use of hinges is disclosed in Japanese Utility Model Registration No. 3015058, entitled “Temple Joint Structure of Eyeglass Frame.” In this invention, an end portion of each lug formed of a wire material is bent so as to form a rectangular ring having a vertical portion; a piece of pipe serving as a bearing is fixed to a ring at an end portion of a temple; and the vertical portion at the end of the lug is inserted into the shaft hole of the bearing, whereby a screw-less hinge mechanism is realized. Moreover, Japanese Patent Application Laid-Open (kokai) No. 08-50264, entitled “Turning Method in Spectaculars and Turning Mechanism therefore” proposes a structure similar to that disclosed in Japanese Utility Model Registration No. 3015058, except that resistance is imparted to turning motions of temples with respect to lugs. Specifically, a shaft portion at each temple end (an end of a temple adjacent to a corresponding bracket (lug)) is brought into press contact with the bracket, to thereby impart resistance to turning motion of the shaft portion.
A hinge mechanism described in Japanese Patent Application Laid-Open (kokai) No. 2000-221452, entitled “Spectacle Frame,” has the same temple turning structure as that disclosed in Japanese Patent Application Laid-Open No. 08-50264. However, the hinge mechanism is structured in such a manner that, with mediation of a connection piece formed of synthetic resin, a connection-piece attachment portion of each lug is fitted into a pivot hole of a corresponding temple. The degree of tightness of the pivot hole is finely adjusted so as to generate a proper frictional resistance to turning motion of the temple.
In the case of spectacle temple open/close structures, such as those disclosed in the above-mentioned “Temple Joint Structure of Eyeglass Frame” and “Turning Method in Spectaculars and Turning Mechanism therefor,” which do not use ordinary screw-type hinges, resistance at the time of turning temples cannot be found unless the temples are attached to lugs. Further, since adjustment of such turning resistance requires removal of the temples from the lugs, the adjustment is difficult. In contrast, the “Spectacle Frame” has a structure which enables fine adjustment of the above-mentioned resisting characteristic to be performed before attachment of temples to lugs. However, the frictional resistance at the time of turning motion is generated by means of synthetic resin (connection piece) interposed between the pivot hole of each temple and the connection-piece attachment portion of a corresponding lug.
Gold frames are popular spectacle frames. However, when a spectacle frame is fabricated from parts formed of a single metal (gold), weight increases. Therefore, weight reduction is demanded. The above-mentioned inventions; i.e., techniques, have enabled such weight reduction and structure simplification. However, the above-described techniques have a drawback in that temples cannot be stably maintained at their open positions or closed positions. The “Turning Method in Spectaculars and Turning Mechanism therefor” proposes a structure in which a concave portion is provided on one end of each bracket (lug), and the shaft of a corresponding temple is pressed against the concave portion. However, this arrangement is intended only to prevent application of excessive mechanical force to the turning mechanism, not to stably maintain the temple. In the “Spectacle Frame,” friction resistance produced by means of tightening the turning portion is utilized so as to enable stable opening and closing operation while providing proper resistance. However, synthetic resin is used at connection portions.
An object of the present invention is to provide a screw-less hinge mechanism for spectacles, the frame of which is formed from a single material, the screw-less hinge mechanism being configured based on the above-mentioned conventional technique but eliminating play of temples to thereby stably maintain the temples in an open state or a closed state. Notably, the term “hinge mechanism” used herein refers to a portion of a spectacle frame having a structure for rotatable connection, and does not refer to a hinge, which is an independent part of spectacles. Accordingly, the term “screw-less hinge” refers to a connection portion which is provided between a temple and a lug, which does not use a conventional hinge (screw hinge), and which provides a turning function (hinge function).
A hinge is a portion for connecting a temple to a front rib and enabling the temple to be opened and closed. An ordinary hinge fixes a temple to a rim by use of a screw and via a lug provided between the rim and the temple, to thereby enable opening and closing of the temple. In the case of a screw hinge, the resisting characteristic can be finely adjusted through adjustment of the degree of tightness of the screw, whereby play of temples can be eliminated at their open state or closed state.
In the “Spectacle Frame” discussed in the background art section, synthetic resin is used for the turning mechanism portions, whereby friction resistance can be adjusted through adjustment of the degree of tightness of the pivot hole. In contrast, the present invention employs a simple structure which does not use synthetic resin. Therefore, the stability of each temple in an open state and a closed state must be attained by a different method. In order to attain this, the present invention employs a hinge mechanism in which each temple is held by a portion of a corresponding lug when the temple is in an open or closed state.
Specifically, the present invention provides a hinge mechanism for spectacles in which a temple formed of metal is turned with respect to a corresponding lug formed of a metal, wherein each of the temple and the lug is formed of a wire-like metal material; a tip end of the temple is formed into an annular shape so as to define a pivot hole; a pivot portion of the lug is inserted into the pivot hole whereby turning motion of the temple is enabled; and a temple-side end portion of the lug controls opening of the temple and prevents the temple from turning inward from an open position.
The above-mentioned wire-like metal material is preferably hollow, from the viewpoint of strength. When the wire-like metal material has a generally cylindrical shape, manufacture of the wire-like metal material is easy. However, the shape of the wire-like metal material is not limited hereto. For example, the wire-like metal material may have an oval cross section.
An embodiment of the present invention will be described with reference to the drawings.
In the above-described embodiment, the end portion of the lug is bent to form a hook-shaped holding portion, and the temple is engaged with the hook-shaped holding portion. However, as shown in
The width of the insertion opening 122 is rendered slightly smaller than the shaft transverse dimension of the temple (diameter when the temple has a cylindrical shape).
The lug having a concavely curved, open-state holding portion may be formed in the shape shown in
In the example shown in
According to the present invention, each hinge portion can be formed from a metal wire material. Thus, the entirety of a spectacle frame can be formed of a single metal wire material, whereby the weight of the frame can be reduced. In particular, when gold that is preferred by clients but is heavy is used, not only the weight but also the number of metal parts other than gold parts can be reduced, whereby production cost can be lowered.
The hinge mechanism of the present invention cannot have the same resisting characteristic as ordinary hinges. However, since a high level of stability is attained in the opened state, no practical problem arises. Moreover, the entire frame is formed of a thin wire, imparting a streamlined structure, which is preferably from the viewpoint of appearance. Furthermore, since each temple is held between two points; i.e., between the pivot and the open-state holding portion, the frame has no location where stresses concentrate, and is therefore hardly broken.
In summary, the present invention provides the following advantageous effects.
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/JP02/06634 | 7/1/2002 | WO | 11/26/2004 |
