Patent Publication Number: US-9421427-B2

Title: Diminishable and distensible ball net bag structure

Description:
BACKGROUND OF THE INVENTION 
     1. Technical Field 
     The present invention relates to a technical field of ball net bags and, more particularly, to a diminishable and distensible ball net bag structure essentially including a ball net bag of a capacity changeable with the quantity and total weight of balls contained therein to keep the balls close to the bag mouth and thus ensure easy access to the balls. 
     2. Description of Related Art 
     Ball sports, such as baseball, tennis, table tennis, basketball, and volleyball, share a common feature. That is, each training session requires so many balls that the balls have to be held in a ball net bag. Conventional ball net bags are of a fixed shape and thus are likely to crease when folded up. Conventional ball net bags are not only difficult to store but are also disadvantaged by their fixed capacity as a result of their fixed shape. Due to their fixed capacity, high-capacity conventional ball net bags holding few balls therein are inconvenient to users, because the users&#39; hands can hardly reach the balls inevitably found at the bottoms of the ball net bags. Whereas, low-capacity conventional ball net bags annoy users with the inherent inadequacy of capacity. 
     SUMMARY OF THE INVENTION 
     It is an objective of the present invention to provide a diminishable and distensible ball net bag structure which essentially comprises a ball net bag of a capacity changeable with the quantity of balls contained therein to therefore achieve advantages as follows: in the case of a few balls, resilient elements contract while keeping the balls close to a mouth of the ball net bag; and in the case of plenty balls, the resilient elements not only stretch and thus distend the ball net bag but also keep the balls close to the mouth to ensure easy access thereto even when the balls are taken out of the ball net bag one by one. 
     In order to achieve the above and other objectives, the present invention provides a diminishable and distensible ball net bag structure comprising a net bag bottom portion, a net bag peripheral side, a net bag mouth rim portion, and at least four resilient elements. The upper peripheral edge of the net bag bottom portion adjoins the lower peripheral edge of the net bag peripheral side. The upper peripheral edge of the net bag peripheral side adjoins the net bag mouth rim portion. The resilient elements are disposed at four portions or at the four portions and the junctions of every two adjacent said portions of the net bag peripheral side, respectively, and are spaced apart from each other by an appropriate distance. When a few balls are placed in the ball net bag, the balls together are light enough for the resilient elements to contract while keeping the balls close to a bag mouth of the ball net bag structure to ensure easy access to the balls. When plenty balls are placed in the ball net bag, the balls together are heavy enough for the resilient elements to not only stretch and thus increase the capacity of the ball net bag in order to contain all the balls but also keep the balls close to the bag mouth to ensure easy access to the balls even when the balls are taken out of the ball net bag one by one. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic perspective view of a ball net bag structure according to an embodiment of the present invention; 
         FIG. 2  is a schematic perspective view of the ball net bag structure according to another embodiment of the present invention; 
         FIG. 3  is a schematic view illustrative of easy access to balls placed in the ball net bag structure of the present invention even in the event of few balls; 
         FIG. 4  is a schematic view which shows the ball net bag structure of the present invention enlarges automatically to increase the capacity thereof in the event that plenty balls are placed in the ball net bag structure; 
         FIG. 5  is a schematic view of the ball net bag structure applicable to a ball net bag rack with rollers according to the present invention; 
         FIG. 6  is a schematic view of the ball net bag structure with a cover for covering the top surface of the ball net bag structure by a zipper according to the present invention; 
         FIG. 7  is a schematic view of the ball net bag structure applicable to another ball net bag rack according to the present invention; 
         FIG. 8  is a schematic view of the ball net bag structure applicable to yet another ball net bag rack according to the present invention; 
         FIG. 9  is a schematic view of the ball net bag structure applicable to still yet another ball net bag rack according to the present invention; 
         FIG. 10  is a schematic perspective view of the ball net bag structure according to another embodiment of the present invention 
         FIG. 11  is a schematic perspective view of the ball net bag structure applicable to a ball net bag rack according to another embodiment of the present invention; 
         FIG. 12  is a schematic exploded view of the ball net bag structure applicable to the ball net bag rack according to yet another embodiment of the present invention; 
         FIG. 13  is a schematic exploded view of the ball net bag structure applicable to the ball net bag rack according to still yet another embodiment of the present invention; 
         FIG. 14  is a schematic perspective view of the ball net bag structure applicable to the ball net bag rack according to a further embodiment of the present invention; and 
         FIG. 15  is a schematic exploded view of the ball net bag structure applicable to the ball net bag rack according to a further embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS OF THE INVENTION 
     The present invention provides a diminishable and distensible ball net bag structure. 
     Referring to  FIG. 1  through  FIG. 9 , the present invention provides a diminishable and distensible ball net bag structure. The diminishable and distensible ball net bag structure comprises a net bag bottom portion  10 , a net bag peripheral side  20 , a net bag mouth rim portion  30 , and at least four resilient elements  40 . 
     The lower peripheral edge of the net bag peripheral side  20  adjoins the upper peripheral edge of the net bag bottom portion  10 . 
     The net bag mouth rim portion  30  adjoins the upper peripheral edge of the net bag peripheral side  20 . 
     The resilient elements  40  are disposed at four portions or at the four portions and the junctions of every two adjacent said portions of the net bag peripheral side  20 , respectively, and are spaced apart from each other by an appropriate distance. Two ends  41 ,  42  of each said resilient element  40  are connected to the net bag mouth rim portion  30  and the net bag bottom portion  10 , respectively, to form a ball net bag  1 . When few balls  60  are placed in the ball net bag  1 , the balls  60  together are light enough for the resilient elements  40  to contract while keeping the balls  60  close to a bag mouth  2  of the ball net bag structure so as to ensure easy access to the balls  60 . When plenty balls  60  are placed in the ball net bag  1 , the balls  60  together are heavy enough for the resilient elements  40  to not only stretch and thus increase the capacity of the ball net bag  1  in order to contain all the balls  60  but also keep the balls  60  close to the bag mouth  2  to ensure easy access to the balls  60  even when the balls  60  are taken out of the ball net bag  1  one by one. 
     Regarding the diminishable and distensible ball net bag structure, a cover  50  is disposed on the net bag mouth rim portion  30  and equipped with a zipper  51  for connecting the cover  50  to the net bag mouth rim portion  30 . 
     Regarding the diminishable and distensible ball net bag structure, the net bag mouth rim portion  30  has two handles  52  above to enhance ease of transport of the ball net bag  1 . 
     Regarding the diminishable and distensible ball net bag structure, four corners of the net bag mouth rim portion  30  extend outward to form four lugs  31 , respectively. Each said lug  31  has a fixing hole  311 . Multiple rollers  71  are disposed at the bottom of a first ball net bag rack  70 . Mushroom-headed fixing rods  72  are disposed at the top of the first ball net bag rack  70  and fixed penetratingly to the fixing holes  311  of the lugs  31 , respectively. 
     Regarding the diminishable and distensible ball net bag structure, the ball net bag  1  is disposed on a second ball net bag rack  80 . The second ball net bag rack  80  has multiple legs  81  which rest on the ground. The second ball net bag rack  80  has an upper lid  82  for covering the ball net bag  1  from above. 
     Regarding the diminishable and distensible ball net bag structure, the ball net bag  1  is disposed on a third ball net bag rack  90 . The third ball net bag rack  90  has multiple legs  91  which rest on the ground. The third ball net bag rack  90  has a top lid  92  for covering the ball net bag  1  from above. 
     Regarding the diminishable and distensible ball net bag structure, the ball net bag  1  is disposed on a fourth ball net bag rack  100 . The fourth ball net bag rack  100  is peripherally provided with an enclosing fabric  101  for enclosing the fourth ball net bag rack  100 . 
     Regarding the diminishable and distensible ball net bag structure, the resilient elements  40  each are a spring, a resilient cord, or a resilient ribbon. 
     Referring to  FIG. 10  through  FIG. 15 , the present invention provides a diminishable and distensible ball net bag structure. The diminishable and distensible ball net bag structure comprises a net bag bottom portion  10 , a net bag peripheral side  20 , a net bag mouth rim portion  30 , and at least four resilient elements  40 . 
     The lower peripheral edge of the net bag peripheral side  20  adjoins the upper peripheral edge of the net bag bottom portion  10 . 
     The net bag mouth rim portion  30  adjoins the upper peripheral edge of the net bag peripheral side  20 . 
     The resilient elements  40  are disposed at four portions or at the four portions and the junctions of every two adjacent said portions of the net bag peripheral side  20 , respectively, and are spaced apart from each other by an appropriate distance. The resilient elements  40  each comprise a resilient cord  43  fastened to a resilient fastener  44 . Two ends  431 ,  432  of each said resilient cord  43  are connected to the net bag mouth rim portion  30  and the net bag bottom portion  10 , respectively, to form a ball net bag  1 . The length of the resilient cord  43  can be adjusted by compressing the resilient fastener  44 , to decrease the capacity of the ball net bag  1  (as shown in  FIG. 10 ) and to increase the capacity of the ball net bag  1  (as shown in  FIG. 11 ). In another embodiment of the present invention, an upper ring  45  and a lower ring  46  are fixed to the upper end and the lower end, respectively, of each of the segments defined at four portions or at the four portions and the junctions of every two adjacent said portions of the net bag peripheral side  20 , respectively, and are spaced apart from each other by an appropriate distance. The resilient cord  43  passes through the upper ring  45 . Afterward, two ends of the resilient cord  43  cross at the lower ring  46 , and the two ends of the resilient cord  43  are fastened to the resilient fastener  44 . The length of the resilient cord  43  can be adjusted by compressing the resilient fastener  44 , to finalize the construction of the ball net bag  1 . 
     In conclusion, the diminishable and distensible ball net bag structure according to the present invention is not only novel and thus meets the novelty requirement of invention patentability, but is also comprehensively innovative and thus meets the non-obviousness requirement of invention patentability. Furthermore, not only does the capacity of the ball net bag change with the quantity and total weight of the balls contained therein, but the ball net bag also keeps the balls close to the bag mouth to ensure easy access to the balls, thereby having high industrial applicability.