Abstract:
A buckle set, which fits onto a strap for adjusting the strap to a desired length, generally fits onto the strap attached to goggles of almost any application, such as swimming goggles, scuba mask, or dust and wind goggles. Specifically, a buckle set allows a strap to easily and quickly be adjusted to a desired length from its two ends.

Description:
BACKGROUND OF THE INVENTION 
   I. Field of the Invention 
   The present invention relates to a buckle set, in which a strap is inserted for length adjustment, and specifically to a buckle set that allows the strap to be adjusted to a desired length from its two ends. 
   II. Description of the Prior Art 
   The buckle that fits onto a strap is commonly used to adjust the strap to a desired length. Among various buckles, tri-glide or vertical flip are the most popular. With reference to  FIG. 1 , which shows a tri-glide buckle of the prior art, the tri-glide buckle  102  fits onto a strap  103  attached to a pair of swimming goggles  101 . As shown in  FIG. 1 , the strap is inserted into two slots respectively formed on two sides of the sealing frame of swimming goggles  10 , and two ends of the strap  103  are inserted into the holes  1021  formed on the tri-glide buckle  102  so that the strap can be adjusted to a desired length. 
   Accordingly, the tri-glide buckle  102  can be positioned on a strap so as to set the strap to a desired length, the strap easily comes off the tri-glide buckle  102  though. The strap  103  is made of rubber and has its two ends inserted in the tri-glide buckle  102 . When its two ends are pulled for length adjustment, the strap rebounds because of the rebound property resulting from its elasticity and would consequently come off the tri-glide buckle  102   
   SUMMARY OF THE INVENTION 
   In view of the foregoing drawbacks, it is desirable to develop a buckle design that substantially meets user demands and improves convenience and effectiveness in use. The main objective of the present invention is to provide a buckle set that is user-friendly and can be firmly positioned on a strap so as to set the strap to a desired length. 
   The buckle set provided by the present invention generally comprises three parts, namely a buckle seat, a buckle composed of two corresponding clasps, and a buckle hood. Insert two ends of a strap into said clasps so that the strap can be set to a desired length. 
   Desirable structure, assembly, and features of the present invention will be better understood from the detailed description and drawings that follow, in which various embodiments of the disclosed invention are illustrated by way of example. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  shows a buckle of the prior art. 
       FIG. 2  shows a three-dimensional view of the invention. 
       FIG. 3  shows an embodiment of the invention. 
       FIG. 4  shows unbuckling (I) of the invention. 
       FIG. 5  shows buckling (II) of the invention. 
   

   DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   With reference to  FIG. 2 , which shows a three-dimensional view of the present invention, the buckle set  20  comprises a buckle seat  201 , a buckle  202 , and a buckle hood  203 . The buckle seat  201  is mainly structured by a receptor  2011  that comprises a plurality of springs  2012 , barriers  2015 , pivot slots  2013 , and two strap slots  2014 . The barriers  2015  are formed nearby the springs  2012 . The pivot slots  2013  are formed on flanks of the buckle seat  201 . The strap slots  2014 , into which the strap  30  is inserted, are formed on two ends of the buckle seat  201  respectively. The buckle  202  is composed of two corresponding clasps, each of which comprises a press stud  2024 , two pivots  2021 , two bumps (the first bump  2025  and the second bump  2023 ) and a pressing portion  2022 . The first bump  2025  and the pressing portion  2022  are formed respectively on two ends of the buckle  202 . The second bump  2023  is positioned between the pressing portion  2022  and the pivot  2021 . The buckle hood  203  is a removable cover over the buckle seat  201  that comprises a pair of holes  2031 . Ensconce the buckle  202  into the buckle seat  201  that the first bump  2025  is positioned against the spring  2012  and the second bump  2023  against the barrier  2015 . Fit the buckle hood  203  onto the buckle seat  201 , in which the buckle has fit in, the press studs  2024  would partially protrude from the holes  2031  so as to be pressed by one&#39;s thumbs. 
   With reference to  FIG. 3 , which shows an embodiment of the present invention, the buckle set  20  fits onto a strap attached to a pair of swimming goggles  40 . By pressing the press studs  2024 , the wearer can easily and quickly buckle up, unbuckle the buckle set  20 , or adjust length of the strap. 
   With reference to  FIG. 4 , which shows unbuckling (I) of the present invention, the buckle set  20  comprises two strap slots  2014 , in which two ends of the strap  30  are inserted. When the buckle  202  is unbuckled, the strap can run freely in the strap slots so as to easily and quickly be adjusted to a desired length. Also shown in  FIG. 4 , when the buckle  202  is unbuckled, the pressing portion  2022  of the buckle  202  is spaced apart from the strap  30  and the second bump  2023  from the barrier  2015  of the buckle seat  201 . On the other hand, the first bump  2025  of the buckle  202  jostles against the spring  2012  of the buckle seat  201  so that the buckle  202  can be pushed back to its original position while the spring  2012  is rebounding by its elasticity. 
   With reference to  FIG. 5 , which shows buckling (II) of the present invention, the buckle set  20  is buckled up after the strap  30  is adjusted to a desired length. When the buckle  202  is buckled up to set the strap  30  at desired length, the strap  30  hardly comes off the strap slots because the pressing portion  2022  butts in one of the teeth  301  and the second bump  2023  jostles against the barrier  2015  of the buckle seat  201 . The teeth  301  are formed on the surface of two ends of the strap  30 . Moreover, pulling the strap  30  may cause a force in the direction as indicated by the arrow shown in  FIG. 5 . The force may push the second bump  2023  to further jostle against the barriers  2015  as well as cause the pressing portion  2022  to tightly press on the strap  30 . As shown in  FIG. 5 , the buckle  202  is composed of two corresponding clasps, in which two ends of the strap  30  are inserted, so that the strap can be adjusted to a desired length from its two ends. The design of the two corresponding clasps favors users with an easy and effective way of adjusting length of a strap attached to swimming goggles from its two ends. 
   Accordingly, the present invention mainly uses a buckle that is composed of two corresponding clasps to facilitate the length adjustment of a strap that is attached to a pair of swimming goggles. Two ends of a strap are respectively inserted in said clasps so that the strap can be adjusted to a desired length from its two ends. In sum, the present invention achieves in providing a buckle set that is user-friendly and can be firmly positioned on a strap so as to set the strap to a desired length. 
   While the present invention is susceptible to various modifications and alternative forms, the specific embodiments have been shown by way of example in the drawings and described in detail herein. However, it should be understood that the present invention is not intended to be limited to the particular form disclosed. Rather, the present invention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention as defined by the appended claims.