Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Connectors
Patent
1999-07-07
2000-08-01
Mai, Huy
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Connectors
351113, 16228, G02C 522
Patent
active
060956461
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The object of this invention is an improvement of a bi-elastic device, particularly for the elasticizing of an ear-piece for spectacles. The innovation finds particular, if not exclusive, application in the field of spectacles production, including small metal parts and their fittings.
2. Background Art
It is known that many frames for spectacles are found in the prior art. Some of these frames have devices located close to their hinging for allowing the elastic fastening of ear-pieces to a part of the frame known as a front face. Having such a device located on both sides of the spectacles has the advantage of giving a better fit, because if the ear-pieces exert a low pressure on a person's temples, they are easier to endure by most people, and the spectacles are more adaptable to the different anatomical shapes of each subject. Therefore, the firms in this field are constantly attempting to find innovative and improved solutions, both with regard to function and size of these devices, when compared to the preexisting devices.
For example, a traditional elasticized ear-piece, that found wide acceptance among consumers is disclosed in the European patent application n.79400087.7, in which an elastic hinge was described for a spectacles frame. The elastic hinge comprises a box associated sideways to the ear-piece, the box containing a tie-rod coaxial to the box, and in which an end portion of the tie-rod is threaded, on which is screwed a bushing that ensures the positioning of a spring, while the other side of the tie-rod is in abutment on the inside of a seat in the box.
Another system, conceptually based on the solution provided by the previous patent, is disclosed in the utility model n.181221, which has an improved hinge for the articulation of a spectacles frame with an elastically openable ear-piece. A squared support is provided in the frame, on which is inserted a support which is also squared that makes up a shoulder for the compression of a spring.
Finally, the Italian Patent n. 1 147 198 discloses an ear-piece for spectacles with an elastic hinging in which an end of the ear-piece has an axially holed small block within which is inserted one end for the connection of the hinge. Continuing with a reduced diameter, it supports a sharp edge that is fixed inside the borehole while on the back of the borehole is a tension helicoidal spring blocked at an end by a threaded locknut. In such a case, it is possible for the elastic opening of the ear-piece to achieve a certain angle by an elastic yielding of the hinge-like connection.
The common drawbacks noticed in the above-mentioned solutions include excessive complexity of the utilized devices and a total oversizing of the device. Furthermore, notwithstanding that the above-mentioned devices may perform their functions perfectly, they have many problems during the manufacturing phase, such as the manufacturing of the many precision components, as well as their assembly, each considerably influencing the manufacturing time and cost. Therefore, a main purpose of the firms of the field has been to obtain elasticizing devices for ear-pieces that are smaller in size, offer good functionality while at the same time reducing the number of components, and decrease the assembly time and costs.
In the numerous recent devices on the market that are more or less effective and in line with the above mentioned principles, there is a solution in which the articulation is an ear-piece with a sliding body containing an elasticizing spring. In more detail, the body has a square cross section, in which some material has been removed longitudinally from one part of the body to another to obtain opposite thin sheets which define a guide seat, and make up containing walls of a spring. On one side, the spring is placed in abutment on the seat, while on the other, the spring is fastened to a tooth which protrudes outward with respect to the profile defined by the sliding body. Also, the device has a half-hull, is opened on one s
REFERENCES:
patent: 5745209 (1998-04-01), Khantzis
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