Auxiliary frame for eyeglasses

Details Auxiliary frame for eyeglasses Auxiliary frame for eyeglasses

2003-09-03

2004-06-15

Dang, Hung X. (Department: 2873)

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

With moisture prevention or absorption

C351S047000, C002S435000

Reexamination Certificate

active

06749299

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to eyeglasses and more particularly to an improved auxiliary frame releasably mounted on the frame of a pair of sunglasses or the like.
2. Description of Related Art
Conventionally, a wearer of sunglasses likes to mount an auxiliary frame on the frame of the sunglasses. The auxiliary frame typically has a pad on the back for providing a degree of comfort to the wearer and/or protection. A conventional such auxiliary frame
30
is shown in
FIGS. 1 and 2
. As illustrated, a pair of lenses
101
are supported in a frame
10
of a pair of sunglasses
40
. The frame
10
further comprises, at its back, two holes
103
at both sides of bridge
102
and two substantially parallelepiped slots
104
each at an endpiece coupled to a pivotable temple
20
. Correspondingly, the auxiliary frame
30
comprises two forward tabs
301
at both sides of bridge, two substantially parallelepiped projections
302
each at an endpiece, and a pad at its back. Each of the frame
10
and the auxiliary frame
30
is formed of thermoplastic material so as to be bendable. The auxiliary frame
30
is mounted on the frame
10
with the projections
302
snugly fitted in the slots
104
and the tabs
301
snugly fitted in the holes
103
respectively (see circles D and E of FIG.
2
).
Advantageously, the auxiliary frame
30
can be removed from the frame
10
for storage in an unused state. Also, such assembly is adapted to fit different individuals with various head sizes. For example, as shown in
FIG. 3
, in a case of the wearer having a larger head, the frame
10
flexibly, laterally expands in response thereto. Unfortunately, this may result in a partial or even complete withdrawal of the projections
302
from the slots
104
due to the substantially parallelogramic shapes of the projections
302
and the slots
104
and in turn the forming of a gap
50
at either endpiece between the frame
10
and the auxiliary frame
30
(see circle F). Such gaps
50
will inevitably loosen the whole eyeglasses
40
. Thus, the need for improvement still exists.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a flexible, auxiliary frame mounted on a flexible frame of a pair of eyeglasses, the frame including, at its back, a hole in a center of a bridge, two protrusions having a larger bottom at both sides of the hole, and two slots at endpieces, the auxiliary frame comprising a forward tab at a bridge thereof; two grooves at both sides of the tab; two projections having a larger outer end disposed at endpieces thereof; and a rear pad, wherein the projections are matingly fitted in the slots, the tab is fitted in the hole, and the protrusions are fitted in the grooves respectively, and the frame together with the auxiliary frame are adapted to flexibly expand in response to a lateral bending.
In one aspect of the present invention each of the frame and the auxiliary frame is formed of thermoplastic material.
The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings.


REFERENCES:
patent: 6062688 (2000-05-01), Vinas
patent: 6641263 (2003-11-01), Olney

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