Australian Patents Act 1990 - Regulation 3.2 ORIGINAL COMPLETE SPECIFICATION STANDARD PATENT Invention Title Smart sliding buckle The following statement is a full description of this invention, including the best method of performing it known to me/us: P3/00/011 ri~/O/ Field The embodiment describes herein a smart sliding buckle that relates to garment accessories, particularly bra buckles. Background Current designs of loop-frames of bra buckles are generally rectangular-shaped, of which a bottom is transitionally connected to form a U-shape loop. There is generally a hooking-prong on one end of a piece of garment that matches with a loop-frame on the other end. While using, a user uses his hands to hook up the hooking-prong and the loop-frame to form a tie. The secured tie is often stable and can be easily unhooked. The hooking-prong and the loop-frame have to spatially match to each other to form a tie. A bra usually has multiple pairs of hooking-prongs and loop-frames. Because the spatial positions of the hooking-prongs have to match with the corresponding loop-frames in a somewhat accurate manner to form a tie, it requires a relatively high level of precision for a user to successfully secure a tie between the hooking-prongs and loop-frames. This requirement of high level of precision incurs high level of difficulty for users. The difficulty is even greater if the hooking-prongs and the loop-frames on a bra locate in a position where a user cannot see. Therefore, current designs of bra buckles cannot provide sufficient convenience for users; instead, they incur great inconvenience. Summary Embodiments herein describe a novel buckle design, a smart sliding buckle, that is relatively easy to use. While forming a tie, a smart sliding buckle can easily form a tie even if the spatial positions of the hooking-prongs and the loop-frames do not match to each other exactly. Embodiments may be implemented as follows. I a A smart sliding buckle may include a hooking-prong and a loop-frame. The hooking prong may be a flattened hook. The loop-frame may be a V-shaped loop-frame. Lower ends of two bars of the V-shaped loop-frame may be curvedly connected, forming an arc. Upper ends of the two bars of the V-shaped loop-frame may connect to fixing rings that can be used to fix the loop-frame on a piece of garment, such as a bra. An angle between the two bars of the V-shaped loop-frame may range from 30 to 150 degrees. Embodiments decrease the precision requirement to form a tie. While forming a tie, an embodiment allows certain degrees of variations of spatial mis-match between the hooking prongs and loop-frames. Within the allowed variation of spatial mis-match, users can easily form a tie that has the same effects provided by a traditional bra buckle. The embodiments described herein can increase the ease of use. Drawings Figure 1 illustrates a structure of the hooking-prong. Figure 2 illustrates a structure of the loop-frame. Figure 3 illustrates a schematic view of a pair of mis-matched hooking-prong and loop frame of a smart sliding buckle. Figure 4 illustrates a force diagram of a pair of mis-matched hooking-prong and loop frame of a smart sliding buckle while in the process of forming a tie. Figure 5 illustrates a schematic view of a secured tie of a smart sliding buckle. 2 Detailed Description Figure 1, Figure 2, Figure 3, Figure 4, and Figure 5 further disclose the embodiments: As shown in Figure 1 and Figure 2, the embodiment includes two major elements: a hooking-prong I and a V-shaped loop-frame 2. The hooking-prong I is installed at one end of a bra being connected. The V-shaped loop-frame 2 is installed at the other end of the bra being connected. The hooking-prong I in this embodiment is a flattened hook. The V-shaped loop frame 2 in this embodiment includes two bars 21, forming a V-shape. Lower ends of the two bars of the V-shaped loop-frame are curvedly connected, forming an arc 22. Two upper ends of the bars 21 of the V-shaped loop-frame 2 connect to fixing rings 4 that can be used to fix the loop frame on a piece of garment, such as a bra. An angle between the two bars 21 of the V-shaped loop-frame 2 ranges from 30 to 150 degrees. This angle can vary from one clothing style to another. With a traditional bra buckle, if the physical positions of a hooking-prong and a loop frame do not match to each other in a relatively accurate manner, a tie can be difficult to form. However, with the embodiment described herein, if the hooking-prong I and the V-shaped loop frame 2 do not match to each other precisely, as shown in Figure 3, a tie can still be formed. While in the process of forming a tie, if a certain degree of position mis-match exists between the hooking-prong I and the V-shaped loop-frame 2, as in Figure 4, a force F is formed on the V shaped loop-frame 2. The force F can be broken down to sub-force F, and sub-force F 2 . Sub force F 2 is orthogonal to a contacting bar 21 of the V-shaped loop-frame. Sub-force F, is parallel to the contacting bar 21 of the V-shaped loop-frame. Sub-force F, drags the hooking-prong along the direction of the contacting bar of a V-shaped loop-frame 2ltowards the lower arced end of the V-shaped loop-frame 22. Figure 5 shows a secured tie between the hooking-prong and the V 3 shaped loop-frame. In Figure 5, force Fo on the hooking-prong is balanced with two counteracting forces provided by the two fixing rings. Each fixing ring provides 0.5F 0 . Thus, a tie is secured. This embodiment illustrates a mechanism that can easily secure a tie without matching the physical positions exactly. This embodiment provides a V-shaped loop-frame 2 structure that guides a mis-matched hooking-prong I to a lower arced end 22 of the V-shaped loop-frame 2, securing a tie. The open end of the V-shaped loop-frame 2 is generally bigger than a loop-frame of a traditional bra buckle. This may provide additional ease of use to secure a tie between the hooking-prong I and the V-shaped loop-frame 2. Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps. The reference in this specification to any prior publication (or information derived from it), or to any matter which is known, is not, and should not be taken as an acknowledgment or admission or any form of suggestion that that prior publication (or information derived from it) or known matter forms part of the common general knowledge in the field of endeavour to which this specification relates. 4