Hinge for spectacles

Details Hinge for spectacles Hinge for spectacles

1999-05-28

2001-02-27

Knight, Anthony (Department: 3626)

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Hinge

Eyeglass hinge

Reexamination Certificate

active

06192553

ABSTRACT:

This innovation regards a new hinge for spectacles fitted to utilise normal spectacle arms, which are to be hinged on the lug of the front of the glasses, in order to allow an elastical opening.
The innovative peculiarity of the invention is that it is giftet with lugs of the front of spectacles with a slot for an elastic means, acting on a slider which is confined by a ringed hinging between the front and the arm and pushed by the elastic means against the front plate of the arm to give it the desired re-entry pressure.
Well known are numberless joints, fitted to favour a moderate pressure of arms on the head, during the opening phase, when wearing a pair of spectacles. Those hinges, generically called “elastic joints”, are based on the application of a gear-slider, pushed or held by an elastic means which is interposed between the extremity of the arm and its fulcrum-grommet on the front of spectacles. The numberless constructive variations of the well-known elastic joints constitute first of all a peculiarity of the specification of the builder of any spectacles model. Secondly, every constructive variation satisfies in particular a specific problem or an aesthetic or functional requirement of that spectacles model.
Almost all solutions of known elastic joints present, however, the inconvenience of having the system of elasticity applied to the extremity of the arm, therefore, in case of consumption of the elastic means, in case of breakage or wear of the device itself, the same must be completely replaced with considerable inconvenience and cost of repairing.
Moreover the application and replacement of the elasticity device on the extremity of arms generally involves considerable difficulties, surmountable only with expensive equipment which the optician not always deems justified, thus obliging the user to change the whole frame.
The main object of this invention is to realise an elastic hinge for spectacles-arms, which can supply the right pressure of arms during their opening and/or wearing of the spectacles, even if this joint is disengaged and independent from the arm itself, therefore able to consent the use or replacement with other normal arms.
Another object of the invention is to make the replacement of the joint or of its parts of elasticity independent from the remaining arm and vice versa.
A further object of the invention is to reduce the actual encumbrances required for the elasticity of the arms, incorporating this system of elasticity in the extremities of the lug of the front.
Another object of the invention is to create an extremely simple and functional elasticity means, easily applicable and of sure efficacy in the future.
These and other aims are, as a matter of fact, perfectly attained with this invention.
The subject matter of the invention is a hinge for spectacles with an elastic slider housed in a lug, in which the slider has an extremity comprising a cylindrical chamfer that abuts an eyelet of a hinge of an arm. The slider is placed inside a blind hole in the lug, together with a resilient member which exerts a force of reaction on the slider, so that in the opened position of the arm the front face of a lateral projection of the arm in the region of the hinge is in contact with the extremity of the slider. The maximum opening angle of the arm is limited by the contact of the front face of the lateral projection against an abutment face on an extremity of the lug inclined with respect to the blind hole.
A further subject matter of the invention is a hinge for spectacles with an elastic slider housed in a lug, in which the slider has an extremity comprising a cylindrical chamfer that abuts an eyelet of a hinge of an arm. The slider is placed inside a blind hole in the lug, together with a resilient member which exerts a force of reaction on the slider whereby the front face of a lateral projection of said arm in the region of the hinge is in contact with said extremity of said slider. The maximum opening angle of the arm is limited by the contact of a plane lateral surface on the lateral projection against the inner wall of the blind hole in the region of its opening.
Suitably said slider is provided with a groove fit to allow it the contact with the hinge ring of said arm, said slider being blocked by said ring.
It is preferred that said slider and its elastic means are housed in a slot created on the lug of the front of said spectacles.
The invention is further illustrated by the following description of one of its constructive solutions, only indicative and not restrictive, which is explained also with the aid of 6 schematic illustrations, reproduced in the enclosed chart.
FIG. 1
represents a blueprint, partly in section, of a lug of the front of spectacles, with the elasticity device in question applied to it, being shown with a normal widening apart of the arm;
FIG. 2
represents a blueprint, partly in section, of the same lug as in
FIG. 1
with the arm at its utmost widening capacity;
FIG. 3
represents a blueprint, partly in section, of the same lug as in
FIG. 1
with the arm completely closed on the front;
FIG. 4
represents a blueprint, on the equal scale and still in part section, of the lug alone associated to the front;
FIG. 5
represents a blueprint, partly in section, of the first variant of the construction solution in question, where the arm is normally wide open;
FIG. 6
represents a blueprint, partly in section, of the alternative solution shown in
FIG. 5
, with the arm at its utmost widening capacity.


REFERENCES:
PCT Written Opinion (PCT/EP97/03538); Apr. 21, 1998.

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