Hinge for spectacles

1. A hinge for use of spectacles comprising a front frame for carrying lenses and a pair of temples, said hinge comprising:

a first attachment device for attaching said hinge to a corresponding one of the temples;

a second attachment device for attaching said hinge to said frame;

a rigid intermediate portion comprising a rigid inflexible member;

a flexible first resilient portion carrying said first attachment device and attached to said rigid intermediate portion; and

a flexible second resilient portion carrying said second attachment device and attached to said rigid intermediate portion opposite said first resilient portion.

2. A hinge as defined in claim 1 , wherein said first resilient portion and said second resilient portion are made of a polymeric material having an intrinsic resiliency.

3. A hinge as defined in claim 2 , wherein said intermediate portion comprises a rigid metallic piece extending between said first resilient portion and said second resilient portion and attached thereto.

4. A hinge as defined in claim 1 , further comprising a flexible unitary resilient member defining first and second ends and reinforced with a rigid element fixedly attached to said unitary resilient member between and spaced from said first and second ends, with said first resilient portion being defined between said first end and said rigid element, with said second resilient portion being defined between said second end and said rigid element, and with said rigid intermediate portion being defined at the position of said rigid element.

5. A hinge as defined in claim 1 , wherein said first attachment device and said second attachment device comprise tenon and mortise joint means for interlock engagement with complementary tenon and mortise joint means provided on the temple and the frame, respectively.

6. A hinge as defined in claim 1 , further comprising a pair of grooves each provided on either side of and adjacent said intermediate portion allowing said first resilient portion and said second resilient portion to collapse towards and against said intermediate portion.

7. Spectacles comprising a front frame for carrying lenses over the nose of a wearer, a pair of temples and a pair of hinges each linking a corresponding one of said temples to said frame, each of said hinges comprising:

a first attachment device attaching said hinge to a corresponding one of said temples;

a second attachment device attaching said hinge to said frame, whereby said temple is hingedly attached to said frame;

a rigid intermediate portion;

a flexible first resilient portion carrying said first attachment device and attached to said rigid intermediate portion; and

a flexible second resilient portion carrying said second attachment device and attached to said rigid intermediate portion opposite said first resilient portion;

wherein each of said temples can be pivoted with its corresponding one of said hinges relative to said frame between a stored position, in which said temple is unbiased by said hinge and in which said temple is pivoted adjacent to said frame; an operative position in which said temple is pivoted away from said frame, is substantially perpendicular to the general plane of said frame and is biased towards said stored position under the effect of a first spring-back biasing force exerted by said first resilient portion and said second resilient portion; and a spread out position, in which said temple is pivoted outwardly away from said frame beyond said operative position and is biased towards said stored position under the effect of a second spring-back biasing force exerted by said first and second resilient portions, with said second spring-back biasing force being greater than said first spring-back biasing force.

8. Spectacles as defined in claim 7 , wherein said first resilient portion and said second resilient portion are made of a polymeric material having an intrinsic resiliency.

9. Spectacles as defined in claim 8 , wherein said intermediate portion comprises a flexible rigid metallic piece extending between said first resilient portion and said second resilient portion and attached thereto.

10. Spectacles as defined in claim 7 , further comprising a flexible unitary resilient member defining first and second ends and reinforced with a rigid element fixedly attached to said unitary resilient member between and spaced from said first and second ends, with said first resilient portion being defined between said first end and said rigid element, with said second resilient portion being defined between said second end and said rigid element, and with said rigid intermediate portion being defined at the position of said rigid element.

11. Spectacles as defined in claim 7 , wherein said first attachment device and said second attachment device comprise tenon and mortise joint means engaged interlockingly with complementary tenon and mortise joint means provided on said temple and said frame, respectively.

12. Spectacles as defined in claim 7 , further comprising a pair of grooves each provided on either side of and adjacent said intermediate portion allowing said first resilient portion and said second resilient portion to collapse towards and against said intermediate portion.

13. Spectacles as defined in claim 7 , wherein said spread out position of each of said temple forms a large acute angle relative to said operative position thereof.

14. Spectacles as in claim 13 , wherein the optimal value of said large acute angle ranges between 30 and 60°.

15. Spectacles as in claim 14 , wherein said optimal value of said large acute angle is about 45°.