Foldable binoculars

A kind of foldable binoculars includes a substantially L-shaped first bracket including a first bottom plate having a first side and a second side, and a first side plate defining two first viewing holes and having a first side extending from the second side of the first bottom plate and a second side. A substantially L-shaped second bracket includes a second bottom plate having a first side pivotally connected with the second side of the first side plate and a second side, and a second side plate defining two second viewing holes and having a first side extending from the second side of the second bottom plate and a second side pivotally connected with the first side of the first bottom plate. Two concave lenses are each mounted on a corresponding one of the two second viewing holes. An adjusting member is movably mounted between the first bracket and the second bracket and defines two third viewing holes each aligning with a corresponding one of the two first viewing holes and each aligning with a corresponding one of the two second viewing holes. Two convex lenses are each detachably mounted on a corresponding one of the two third viewing holes.

FIELD OF THE INVENTION 
The present invention relates to foldable binoculars. 
BACKGROUND OF THE INVENTION 
Conventional binoculars can be adapted to be used in places such as a 
baseball field, a theater, an opera house etc. for providing a user with a 
clearer view. By such an arrangement, however, the focal length of the 
conventional binoculars is fixed and cannot be adjusted arbitrarily, 
thereby greatly limiting the versatility of the binoculars. In addition, 
the binoculars have to be assembled in a factory and will occupy a 
considerable space when being assembled, thereby greatly increasing the 
cost in transportation. In addition, the binoculars cannot be assembled by 
a user, thereby incurring a cost in packaging. Further, the binoculars 
cannot be collapsed, thereby causing an inconvenience in transportation. 
The present invention has arisen to mitigate and/or obviate the 
disadvantage of the conventional binoculars. 
SUMMARY OF THE INVENTION 
In accordance with one aspect of the present invention, there is provided a 
pair of foldable binoculars comprising a substantially L-shaped first 
bracket including a first bottom plate having a first side and a second 
side, and a first side plate defining two spaced first viewing holes and 
having a first side extending from the second side of the first bottom 
plate and a second side. 
A substantially L-shaped second bracket includes a second bottom plate 
having a first side pivotally connected with the second side of the first 
side plate of the first bracket and a second side, and a second side plate 
having a first side extending from the second side of the second bottom 
plate and a second side pivotally connected with the first side of the 
first bottom plate of the first bracket, wherein the second side plate 
defines two spaced second viewing holes each aligning with a corresponding 
one of the two first viewing holes. Two concave lenses are each mounted on 
a corresponding one of the two second viewing holes. 
An adjusting member is movably mounted between the first bracket and the 
second bracket and defines two spaced third viewing holes each aligning 
with a corresponding one of the two first viewing holes and each aligning 
with a corresponding one of the two second viewing holes. Two convex 
lenses are each detachably mounted on a corresponding one of the two third 
viewing holes. 
Further features of the present invention will become apparent after a 
careful reading of the detailed description with appropriate reference to 
the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
Referring to the drawings and initially to FIGS. 1-4, foldable binoculars 1 
in accordance with the present invention comprise a substantially L-shaped 
flexible first bracket 10 including a first bottom plate 12 having a first 
side and a second side, and a first side plate 13 defining two spaced 
first viewing holes 131 and having a first side extending from the second 
side of the first bottom plate 12 and a second side. An elongate slit 11 
is defined between the second side of the first bottom plate 12 and the 
first side of the first side plate 13 such that the first side plate 13 
can be pivoted relative to the first bottom plate 12. 
Two objective carriers 30 are each fixedly mounted on the first side plate 
13 for aligning with a corresponding one of the two first viewing holes 
131 and are each formed with three bosses 31 each securely fitted in a 
respective bore 132 defined in the first side plate 13 located adjacent to 
the first viewing hole 131. 
A substantially L-shaped flexible second bracket 20 includes a second 
bottom plate 22 having a first side pivotally connected with the second 
side of the first side plate 13 of the first bracket 10 and a second side, 
and a second side plate 23 having a first side extending from the second 
side of the second bottom plate 22 and a second side pivotally connected 
with the first side of the first bottom plate 12 of the first bracket 10, 
wherein the second side plate 23 defines two spaced second viewing holes 
231 each aligning with a corresponding one of the two first viewing holes 
131. An elongate slit 21 is defined between the second side of the second 
bottom plate 22 and the first side of the second side plate 23 such that 
the second side plate 23 can be pivoted relative to the second bottom 
plate 22. 
Two concave lenses 50 are each mounted on a corresponding one of the two 
second viewing holes 231. Two eyepiece carriers 40 are each fixedly 
mounted on the second side plate 23 of the second bracket 20 for retaining 
a corresponding one of the two concave lenses 50 therein and are each 
formed with three bosses 41 each securely fitted in a respective bore 232 
defined in the second side plate 23 located adjacent to the second viewing 
hole 231. 
The second side of the first side plate 13 includes two end portions each 
formed with a pivot base 15 transversely defining a pivot hole 151, and 
the first side of the second bottom plate 22 includes two end portions 
each formed with a pivot ear 24 which is formed with a stub 241 pivotally 
received in the pivot hole 151 of a corresponding one of the two end 
portions of the second side of the first side plate 13 such that the 
second bottom plate 22 can be pivotally connected with the first side 
plate 13. 
Each of the two end portions of the second side of the first side plate 13 
is formed with a substantially T-shaped retaining base 17 defining two 
retaining recesses 171, and each of the two end portions of the first side 
of the second bottom plate 22 is formed with an elastic piece 26 
detachably received in one of the two retaining recesses 171 of a 
corresponding one of the two end portions of the second side of the first 
side plate 13. 
The second side of the second side plate 23 includes two end portions each 
formed with a pivot base 25 transversely defining a pivot hole 251, and 
the first side of the first bottom plate 12 includes two end portions each 
formed with a pivot ear 14 which is formed with a stub 141 pivotally 
received in the pivot hole 251 of a corresponding one of the two end 
portions of the second side of the second side plate 23 such that the 
second side plate 23 can be pivotally connected with the first bottom 
plate 12. 
Each of the two end portions of the second side of the second side plate 23 
is formed with a substantially T-shaped retaining base 27 (see FIG. 3) 
defining two retaining recesses 271, and each of the two end portions of 
the first side of the first bottom plate 12 is formed with an elastic 
piece 16 detachably received in one of the two retaining recesses 271 of a 
corresponding one of the two end portions of the second side of the second 
side plate 23. 
An adjusting member 60 is movably mounted between the first bracket 10 and 
the second bracket 20 and defines two spaced third viewing holes 61 each 
aligning with a corresponding one of the two first viewing holes 131 and 
aligning with a corresponding one of the two second viewing holes 231. 
Two convex lenses 70 are each detachably mounted on a corresponding one of 
the two third viewing holes 61. Each of the two third viewing holes 61 
includes two substantially L-shaped arcuate hooks 611 each radially 
extending inwardly for retaining a corresponding one of the two convex 
lenses 70 therein. 
The first side of the second bottom plate 22 defines two spaced first guide 
grooves 29, the second side of the first bottom plate 12 defines two 
spaced second guide grooves 122 each aligning with a corresponding one of 
the two first guide grooves 29, and the adjusting member 60 includes a 
first side formed with two flexible first slides 63 each slidably received 
in a corresponding one of the two first guide grooves 29, and a second 
side formed with two flexible second slides 65 each slidably received in a 
corresponding one of the two second guide grooves 122. 
Each of the two first guide grooves 29 includes a first guide track 291 
formed therein, and each of the two first slides 63 is formed with a 
flexible first lug 631 guided by the first guide track 291 of a 
corresponding one of the two first guide grooves 29. Each of the two 
second guide grooves 122 includes a second guide track 124 formed therein, 
and each of the two second slides 65 is formed with a flexible second lug 
651 guided by the second guide track 124 of a corresponding one of the two 
second guide grooves 122. 
The first side of the second bottom plate 22 defines a first opening 28, 
the second side of the first bottom plate 12 defines a second opening 120 
aligning with the first opening 28, and the first side of the adjusting 
member 60 is formed with a pushing piece 62 slidably received in the first 
opening 28, and the second side thereof is formed with a second pushing 
piece 64 slidably received in the second opening 120. The first pushing 
piece 62 is formed with a first large head 621, and the second pushing 
piece 64 is formed with a second large head 641. 
By such an arrangement, the adjusting member 60 can be slidably mounted 
between the first side of the second bottom plate 22 and the second side 
of the first bottom plate 12. 
Similarly, a third opening 18 and two adjacent third guide grooves 19 each 
formed with a third guide track 191 are respectively defined in the first 
side of the first bottom plate 12, and a fourth opening 220 and two 
adjacent fourth guide grooves 222 each formed with a fourth guide track 
224 are respectively defined in the second side of the second bottom plate 
22 such that the adjusting member 60 can be slidably mounted between the 
second side of the second bottom plate 22 and the first side of the first 
bottom plate 12. 
In assembly, referring to FIGS. 1 and 2 with reference to FIGS. 3 and 4, 
the first bracket 10 and the second bracket 20 are initially disposed in a 
flat manner and can then be bent to a triangular shape as shown in FIG. 1 
respectively. 
Each of the two second slides 65 of the adjusting member 60 can be 
initially pushed to be inserted into the respective guide groove 122 and 
each of the two first slides 63 of the adjusting member 60 can slide into 
the respective guide groove 29. 
The first side of the second bottom plate 22 can then be pivotally mounted 
on the second side of the first side plate 13 by means of inserting the 
stub 241 into the respective pivot hole 151. 
Finally, the first side of the first bottom plate 12 can be pivotally 
mounted on the second side of the second side plate 23 by means of 
inserting the stub 141 into the respective pivot hole 251, thereby 
assembling the entire foldable binoculars 1 as shown in FIG. 2. 
By such an arrangement, the adjusting member 60 can be slidably mounted 
between the first side of the second bottom plate 22 and the second side 
of the first bottom plate 12 such that the distance between the convex 
lens 70 and the respective concave lens 50 can be changed arbitrarily, 
thereby easily adjusting the focal length of the foldable binoculars 1. 
The adjusting member 60 can also be slidably mounted between the second 
side of the second bottom plate 22 and the first side of the first bottom 
plate 12, thereby arbitrarily adjusting the focal length of the foldable 
binoculars 1, wherein the assembling process thereof is the same as 
described above and will not be further discussed in detail. 
Each of two convex lenses 70 can also be received in a corresponding one of 
the two objective carriers 30 such that the distance between the convex 
lens 70 and the respective concave lens 50 is fixed, thereby fixing the 
focal length of the foldable binoculars 1. 
Referring now to FIGS. 3 and 5 with reference to FIG. 1, a shear stress can 
be exerted on the first bracket 10 and the second bracket 20 along a 
direction as indicated by the arrows shown in FIG. 3 such that each of the 
elastic pieces 26 initially received in a first retaining recess 171 can 
be urged to be received in a second retaining recess 171 of the respective 
retaining base 17, and each of the elastic pieces 16 initially received in 
a first retaining recess 271 can be urged to be received in a second 
retaining recess 271 of the respective retaining base 27 such that the 
first and second brackets 10 and 20 can be expanded from a first position 
as shown in FIG. 3 to a second position as shown in FIG. 5, thereby 
collapsing the foldable binoculars 1. 
Accordingly, by such an arrangement, each of the assembling parts of the 
foldable binoculars takes up a small space and can be packaged and 
transported individually, thereby reducing the volume they occupy and 
thereby decreasing the cost in transportation. In addition, the foldable 
binoculars can be easily assembled by a user, thereby reducing the cost 
for assembling it. Further, the foldable binoculars can be collapsed 
easily, thereby facilitating a user to take it. 
It should be clear to those skilled in the art that further embodiments may 
be made without departing from the scope and spirit of the present 
invention.