Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Rimless mounting
Reexamination Certificate
2002-04-29
2003-07-08
Dang, Hung Xuan (Department: 2873)
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Rimless mounting
C351S124000
Reexamination Certificate
active
06588893
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to spectacles or glasses which are provided with no eyewire on rims of lenses of glasses. Such glasses are referred to as “eyewireless glasses” hereinafter.
DESCRIPTION OF THE RELATED ART
Heretofore, generally, eyewireless glasses as shown in
FIG. 6A
are known. Eyewireless glasses
100
comprise, as shown in
FIG. 6A
, a pair of lenses
101
,
101
, a bridge
102
which is provided to attach the lenses
101
,
101
, and a pair of temples
103
,
103
provided in correspondence to the lens
101
,
101
. Attachment mechanisms
110
which respectively attach the lens
101
(
101
) and the bridge
102
, and the lens
101
(
101
) and the temple
103
(
103
) are provided.
FIG. 6B
is an enlarged cross-sectional view taken along the line
6
B—
6
B in
FIG. 6A
, showing the conventional attachment mechanism
110
. As shown in
FIG. 6B
, the attachment mechanism
110
includes a mount groove
111
formed in a side end portion of the lens
101
which extends in a width direction of the lens
101
(direction perpendicularly intersecting the plane of FIG.
6
B), a first through hole
112
formed in a base end of the mount groove
111
(rear direction of the plane in FIG.
6
B), an projection
113
formed at a base end of the temple
103
, which is engageably fitted in the mount groove
111
, a mount element
115
formed with a second through hole
114
in correspondence to the first through hole
112
, a fastening screw
116
which is screwed into the first through hole
112
and the second through hole
114
to attach the lens
101
and the temple
103
, and a nut
117
which fastens the screw
116
.
The mount groove
111
has a rectangular shape in section. The projection
113
has a rectangular shape in section and has such dimensions as to be slidably fitted in the mounting grove
111
. With this arrangement, inserting the screw
116
in the second through hole
114
of the mount element
115
and in the first through hole
112
of the lens
101
and fastening with the nut
117
in a state that the projection
113
is engageably fitted in the mount groove
111
enables to directly attach the temple
103
to the lens
101
.
It should be appreciated that a description of the attachment mechanism for attaching the bridge
102
and the lens
101
(
101
) is omitted in this section of prior art since the attachment mechanism for attaching the bridge
102
and the lens
101
(
101
) is the same as the attachment mechanism for attaching the lens
101
and the temple
103
.
In the attachment mechanism
110
having the above construction, the mount groove
111
of the lens
101
is formed by a cutting tool such as a file. Likewise, the projection
113
is formed at the temple
103
by a cutting tool such as a file. Since it is a general matter that a machining precision by such a cutting tool varies from piece to piece, a clearance d is inevitably formed between the projection
113
and a side and/or bottom wall of the mount groove
111
when the projection
113
is fitted in the mount groove
111
, as shown in FIG.
6
B.
When the clearance d is formed, the bridge
102
and the temple
103
are likely to swing relative to the lens
101
clockwise or counterclockwise about an axis of the fastening screw
116
, which may cause undesirable displacement of the bridge
102
and the temple
103
relative to the lens
101
.
Further, as shown in
FIG. 6B
, generally, a right end portion of the projection
113
on the plane of
FIG. 6B
is not necessarily brought in plane contact with the bottom wall of the mount groove
111
but may be brought in one side contact therewith. When the right end of the projection
113
is rendered in contact with the bottom wall of the mount groove
111
, the projection
113
is also allowed to swing about an axis of the contact point, which may cause undesirable displacement of the bridge
102
and the temple
103
relative to the lens
101
.
Even if the clearance d between the projection
113
and the bottom wall of the mount groove
111
is as small as, for example, 10 &mgr;m, a displacement within such a small clearance causes a large swing of the temple
103
at a distal end thereof since the displacement corresponds to a proportion of the length of the temple
103
against the depth of the mount groove
111
as the displacement is propagated toward the distal end of the temple
103
. For example, when the clearance d is 10 &mgr;m (0.01 mm), the depth of the mount groove
111
is 1.0 mm, and the length of the temple
103
is 140 mm, the distal end of the temple
103
swings at an amplitude corresponding to 1.4 mm (=0.01 mm (10 &mgr;m) ×(140 mm/1.0 mm)). Thus, the distal end of the temple
103
may swing at an amplitude as large the amount corresponding to 2.8 mm.
The swing amount is negligible as far as the glasses
100
are worn. However, when the wearer slightly moves the left and right temples
103
toward and away from each other about an axis of a pivotal point of the corresponding fastening screw
116
when the wearer is about to take off or wear the glasses
100
, the temples
103
are likely to be greatly moved toward and away from each other at their distal ends. The glasses having likelihood of causing such an undesired displacement fail to provide high-grade quality, which may lower their commercial value.
The same problem is also involved in a displacement at a connection portion between the lens
101
(
101
) and the bridge
102
.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a eyewireless spectacles or glasses which are free from the problems residing in the prior art.
It is another object of the present invention to provide eyewireless spectacles or glasses which enable to securely attach a frame member to a lens and suppress an undesirable displacement at a connection portion between the frame member and the lens.
According to an aspect of the invention, a pair of glasses is provided with a frame member which support a glass, and an attachment mechanism. The attachment mechanism includes: a mount groove formed in an end portion of the glass, a lower portion of the mount groove being defined by a converging wall; a mount element provided at an end of the frame member; a fastening device which fastens the frame member on the glass by way of the mount element; and a retaining projection formed on the frame member near the mount element. The retaining projection has a leading end which comes into contact with the converging wall of the mount groove at least two or more points when the frame member is fastened on the glass by the fastening device.
These and other objects, features and advantages of the present invention will become more apparent upon a reading of the following detailed description and accompanying drawing.
REFERENCES:
patent: 6170951 (2001-01-01), Tabacchi
patent: 299 01 347 (2000-01-01), None
patent: WO 96/33438 (1996-10-01), None
patent: WO 97/21133 (1997-06-01), None
Casella Anthony J.
Dang Hung Xuan
Hespos Gerald E.
Kabushiki Kaisha Shimizu Megane
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