Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Rimless mounting
Patent
1996-03-05
1998-07-14
Mai, Huy
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Rimless mounting
351113, 351121, 351133, 351153, 16228, G02C 102, G02C 522
Patent
active
057812705
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a spectacle frame of the type without a surround for the lenses.
More particularly, the invention relates to an improvement to a frame without surround, of the type comprising: a pair of arms; for each arm, An element for connection to the respective lens; an intermediate bridge for the connection of the two lenses; a pair of pads for support on the nose; means for locking the bridge and the connecting elements to the respective lenses.
PRIOR ART
Frames of this type are described, for example, in U.S. Pat. No. 718,363. In this frame, the arms are each formed by a metal wire which, in the end portion adjacent to the lens, forms a helical spring portion constituting a resilient articulation, and a clip for anchoring to the lens. Each arm is linked to the respective lens just by the fact of the resilient force exerted by the clip, and this does not ensure a reliable connection between arm and lens.
For the purpose of guaranteeing a more secure connection, alternative systems of connection between lenses and frame, and in particular between lenses and, intermediate bridge, as well as between lenses and arms, have been devised. By way of example, U.S. Pat. No. 4,502,765 contains a description of a connecting system in which each lens exhibits eyelet holes and in which in each hole there are inserted two pivot pins which are spaced from one another and which are integral with the intermediate bridge or with the arm. A locking screw is inserted between the pivot pins. This locking system exhibits the disadvantage that the eyelet hole in the lens is difficult and costly to construct. Furthermore, this hole exhibits sharp corners which constitute points of weakening and of initiation of phenomena of breakage of the lens.
In other known spectacles there is provided a circular hole, through which there passes the screw, surrounded by a resilient sleeve. The disadvantage of this solution is represented by the fact that the tightening of the screw gives rise to an expansion of the sleeve and consequently a breakage of the lens in correspondence with the hole. Spectacles of this type are illustrated, for example, in the publication FOCUS, No. 6/94, page 47, but in a version having a semi-surround for the lenses.
OBJECT OF THE INVENTION
The subject of the present invention is constituted by a frame without a surround for the lenses, which overcomes the disadvantages of the conventional frames.
In particular, a first subject of the present invention is the construction of a frame of the initially mentioned type, in which the arms and possibly the intermediate bridge can be linked to the lenses in a secure and reliable manner, without the risk of a relative movement with respect to the lenses and without risks of breakage of said lenses.
A further subject of the present invention is a frame which is of low cost and which is easy to assemble.
SUMMARY OF THE INVENTION
The aforementioned objects and further objects and advantages, which will become clear to persons skilled in the art upon reading the text which follows, are obtained with a frame of the initially mentioned type, in which the elements for connecting the arms to the lenses each exhibit a first bent end forming a helical spring intended to be inserted in a corresponding hole of the respective lens, the locking means comprising, for each lens, a screw inserted coaxially in said spring.
With this arrangement, the hole in the lens can be circular, and thus easy to construct. Furthermore, when the helically wound terminal end of the connecting element is inserted in the hole of the lens and the screw is tightened in order to lock the connecting element to the lens, practically no force is exerted on the wall of the hole of the lens, except that due to the slight forcing exerted by the helical spring. The tightening force exerted by the screw is discharged onto the main surfaces of the lens, with a lower specific pressure and thus without concentrated stresses.
In a particularly advantageous embodiment, each one of sa
REFERENCES:
patent: 718363 (1903-01-01), Lembke
Bottega D'Arte In Firenze S.r.l.
Mai Huy
LandOfFree
Frame for spectacles without surround does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Frame for spectacles without surround, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frame for spectacles without surround will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1887653