Patent Publication Number: US-2022232939-A1

Title: Zipper structure for suitcases, and trolley bag

Description:
CROSS REFERENCE OF RELATED APPLICATIONS 
     This application is a continuation of PCT patent Application No. PCT/CN2020/132562, filed on Nov. 30, 2020, entitled “ZIPPER STRUCTURE FOR SUITCASES, AND TROLLEY BAG,” which claims foreign priority of Chinese Patent Application No. 201922246100.3, filed Dec. 16, 2019 in the China National Intellectual Property Administration (CNIPA), the entire contents of which are hereby incorporated by reference in their entireties. 
    
    
     FIELD OF THE DISCLOSURE 
     The present invention relates to the technical field of suitcase, especially to a zipper structure for suitcases, and a trolley bag. 
     BACKGROUND OF THE DISCLOSURE 
     A trolley bag refers to a suitcase with a trolley handle and rollers. Because of the rollers at the bottom, the user can drag it directly, which is very convenient and labor-saving to use. At present, the trolley bags on the market can be roughly divided into two types: zipper trolley bags (referred to as zipper suitcases) and frame trolley bags (referred to as frame suitcases). The zipper suitcase is lighter in weight and is deeply loved by people. However, the zipper needs to be manually sewn during the current manufacturing, which requires more manpower and cannot realize automatic production. 
     SUMMARY OF THE DISCLOSURE 
     In view of this, the present invention provides a zipper structure for suitcases, and a trolley bag which can be automatically produced. 
     In order to achieve the aforementioned object, the present invention provides the following technical solutions: a zipper structure for suitcases, including a zipper strip. The zipper strip includes a front chain belt and a rear chain belt, and also includes a front rubber strip and a rear rubber strip. The front rubber strip is bonded on the front case of the suitcase by thermal pressing. The rear rubber strip is bonded on the rear case of the suitcase by thermal pressing. The front chain belt is connected to the front rubber strip through the front zipper fixing coil. The rear chain belt is connected to the rear rubber strip through the rear zipper fixing coil. 
     Furthermore, a first extension portion and a second extension portion are arranged at intervals on the front rubber strip. A first clamping slot capable of receiving the insertion of the front case is formed between the first extension portion and the second extension portion. 
     Furthermore, a third extension portion and a fourth extension portion are arranged on the rear rubber strip at intervals. A second clamping slot is formed between the third extension portion and the fourth extension portion, into which the rear case can be fitted and inserted. 
     Furthermore, a first locking strip portion of the front zipper fixing coil is inserted into a first locking groove of the front rubber strip. The second locking strip portion of the rear zipper fixing coil is inserted into a second locking groove of the rear rubber strip. 
     Furthermore, the zipper structure also includes a front lining fixing coil and a rear lining fixing coil. The front lining fixing coil is connected to a front lining of the suitcase. The rear lining fixing coil is connected to a rear lining of the suitcase. The front rubber strip is provided with a third clamping groove into which a third clamping strip portion of the front lining fixing coil is inserted. The rear rubber strip is provided with a fourth clamping groove into which a fourth clamping strip portion of the rear lining fixing coil is inserted. 
     Furthermore, the front rubber strip is provided with a recessed portion. The rear rubber strip is provided with a protrusion portion. When the zipper strip is closed, the recessed portion and the protrusion portion are engaged together. 
     Furthermore, the front lining fixing coil is sewn on the front lining. The rear lining fixing coil is sewn on the rear lining. 
     The invention also provides a trolley bag, which utilizes any of the aforementioned zipper structures for suitcases. 
     Furthermore, the trolley bag further includes a rear cover. The rear cover is arranged on the trolley bag. The rear cover is configured to cover a joint seam of the front rubber strip and the rear rubber strip. Two ends of the rear cover are foot nails that play a supporting role. A middle part of the rear cover is a soft rubber portion. 
     Furthermore, a plurality of decorative strips arranged vertically are provided on an outer surface of the trolley bag. The decorative strip is blade-shaped. 
     As can be seen from the above-mentioned technical solutions, the advantages of the present invention are as follows: 
     Compared with the prior art, the invention cancels the traditional manual sewing by improving the product structure, so that the zipper suitcase can be automatically produced. Conventional soft strips are replaced by hard front and rear strips. Additionally, a protrusion portion is disposed on the front rubber strip, and a recessed portion is disposed on the rear rubber strip, so that the zipper suitcase is as strong as the frame suitcase. This makes the zipper suitcase as provided in the present invention more secure when loaded with luggage, free of the unstable state in conventional zipper suitcase. Moreover, the thickness and cross-sectional shape of the front rubber strip and the rear rubber strip can be adjusted according to sizes of the case of the suitcases. 
     In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail below with reference to the drawings. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are just some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative efforts. In the drawings: 
         FIG. 1  is a three-dimensional schematic diagram of the trolley bag of the present invention. 
         FIG. 2  is an exploded view of the trolley bag of the present invention. 
         FIG. 3  is a cross-sectional schematic diagram of the trolley bag of the present invention. 
         FIG. 4  is an enlarged schematic view of the structure at X in  FIG. 3 . 
         FIG. 5  is a schematic diagram of the front rubber strip and the rear rubber strip in embodiment one of the present invention. 
         FIG. 6  is a schematic diagram of the second front rubber strip and the second rear rubber strip in the embodiment two of the present invention. 
         FIG. 7  is another three-dimensional schematic diagram of the trolley bag of the present invention. 
     
    
    
     CHARACTER REFERENCES 
       10 —front case;  101 —first insertion portion;  20 —rear case;  201 —second insertion portion;  30 —wheel set;  40 —first handle;  50 —customs lock;  60 —slider pull tab;  70 —second handle;  80 —decorative strip;  1 —front rubber strip;  1 A—second front rubber strip;  11 —first locking groove;  12 —third locking groove;  13 —recessed portion;  14 —first extension portion;  15 —second extension portion;  16 —clamping slot;  2 —rear rubber strip;  2 A—second rear rubber strip;  21 —second locking groove;  22 —fourth locking groove;  23 —protrusion portion;  24 —third extension portion;  25 —fourth extension portion;  26 —second clamping slot;  3 —zipper strip;  31 —front chain belt;  32 —rear chain belt  32 ;  33 —slider;  4 —front zipper fixing coil;  41 —first locking strip portion;  42 —first connecting strip portion;  5 —rear zipper fixing coil;  51 —second locking strip portion;  52 —second connecting strip portion;  6 —front lining fixing coil;  61 —third locking strip portion;  62 —third connecting strip portion;  7 —rear lining fixing coil;  71 —fourth locking strip portion;  72 —fourth connecting strip portion;  8 —rear cover;  81 —foot nail;  82 —soft rubber portion;  91 —front lining;  92 —rear lining. 
     DETAILED DESCRIPTION OF THE DISCLOSURE 
     The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention. 
     Embodiment One 
     As shown in  FIG. 1  and  FIG. 2 , a trolley bag includes a case, a wheel set  30 , a first handle  40 , a customs lock  50 , a slider pull tab  60 , a second handle  70  and a pair of rear covers  8 . The case includes a front case  10  and a rear case  20 . A front lining  91  is provided inside the front case  10 . A rear lining  92  is provided inside the rear case  20 . A trolley handle is provided on the rear case  20 . The wheel set  30  is provided at the bottom of the front case  10  and the rear case  20 . A first handle  40  is provided on the top of the front case  10 . The customs lock  50  is provided on one side of the front case  10 . The slider pull tab  60  is used in conjunction with the customs lock  50 . The second handle  70  is disposed on the side of the rear case  20  on the same side as the side where the customs lock  50  is located. A pair of rear covers  8  are spaced apart on the side of the trolley bag opposite the side where the customs lock  50  is located. One end of the rear cover  8  is connected to the front case  10 . The other end of the rear cover  8  is connected to the rear case  20 . The two ends of the rear cover  8  are foot nails  81  playing a role of support. The middle part of the rear cover  8  is the soft rubber portion  82 . The trolley bag can be opened at any angle without broken because of the enhanced deformation of the soft rubber portion  82 . In addition, the trolley bag also includes a zipper structure for suitcases. 
     As shown in  FIG. 2 ,  FIG. 3 , and  FIG. 4 , the zipper structure for suitcases includes a front rubber strip  1 , a rear rubber strip  2 , a zipper strip  3 , a front zipper fixing coil  4 , a rear zipper fixing coil  5 , and a front lining fixing coil  6  and a rear lining fixing coil  7 . The zipper strip  3  includes a front chain belt  31 , a rear chain belt  32  engaging the front chain belt  31 , and a slider  33  slidably connected between the front chain belt  31  and the rear chain belt  32 . The front rubber strip  1  is provided with a first extension portion  14  and a second extension portion  15  at intervals. Between the first extension portion  14  and the second extension portion  15 , a first clamping slot  16  is formed into which a first insertion portion  101  of the front case  10  can be fitted and inserted. The rear rubber strip  2  is provided with a third extension portion  24  and a fourth extension portion  25  at intervals. A second clamping slot  26  is formed between the third extension portion  24  and the fourth extension portion  25 , into which a second insertion portion  201  of the rear case  20  can be fitted and inserted. The front zipper fixing coil  4  has a first locking portion  41  and a first connecting strip portion  42  which are connected to each other. The front rubber strip  1  is provided with a first locking groove  11  into which the first locking strip portion  41  of the front zipper fixing coil  4  can be inserted. A first connecting strip portion  42  of the front zipper fixing coil  4  is connected to the front chain belt  31 . The rear zipper fixing coil  5  has a second locking strip portion  51  and a second connecting strip portion  52  which are connected to each other. The rear rubber strip  2  is provided with a second locking groove  21  into which the second locking strip portion  51  of the rear zipper fixing coil  5  can be inserted. The second connecting strip portion  52  of the rear zipper fixing coil  5  is connected to the rear chain belt  32 . The front lining fixing coil  6  has a third locking strip portion  61  and a third connecting strip portion  62  which are connected to each other. The front rubber strip  1  is provided with a third locking groove  12  into which the third locking strip portion  61  of the front lining fixing coil  6  can be inserted. The third connecting strip portion  62  of the front lining fixing coil  6  is connected to the front lining  91 . The rear lining fixing coil  7  has a fourth connecting strip portion  71  and a fourth connecting strip portion  72 . The rear rubber strip  2  is provided with a fourth locking groove  22  into which the fourth locking strip portion  71  of the rear lining fixing coil  7  can be inserted. The fourth connecting strip portion  72  of the rear lining fixing coil  7  is connected to the rear lining  92 . The slider pull tab  60  is attached to the slider  33 . 
     Preferably, as shown in  FIG. 4  and  FIG. 5 , the front rubber strip  1  and the rear rubber strip  2  are rigid rubber strips. The front rubber strip  1  is provided with a recessed portion  13 . The rear rubber strip  2  is provided with a protrusion portion  23 . When the suitcase is closed, the zipper strip  3  is pulled up, and the recessed portion  13  and the protrusion portion  23  are engaged together to make the suitcase fit more tightly. It is more reliable when full of luggage, and there will be no twisting of the zipper suitcase. 
     Preferably, as shown in  FIG. 7 , after the front zipper fixing coil  4  and the front lining fixing coil  6  penetrate into the front rubber strip  1 , and the rear zipper fixing coil  5  and the rear lining fixing coil  7  penetrate into the rear rubber strip  2 , the connection position is covered by the rear cover  8 . At the same time, the rear cover  8  can also prevent the zipper strip  3  from being disengaged from the connection position. 
     Preferably, as shown in  FIG. 1  and  FIG. 7 , a plurality of decorative strips  80  arranged vertically are provided on the outer surface of the trolley bag. The decorative strip  80  is blade-shaped. Irregular endings of the decorative strip make the decorative strip has a three-dimensional appearance. 
     As shown in  FIG. 2  and  FIG. 3 , the structure principle. The front rubber strip  1  and the rear rubber strip  2  are extrusion molding parts. It is formed into the same shape as the case by thermal pressing. The front rubber strip  1  is assembled on the front case  10 , and the front rubber strip  1  and the front case  10  are bonded together by thermocompression. The rear rubber strip  2  is assembled on the rear case  20 , and the rear rubber strip  2  and the rear case  20  are bonded together by thermocompression. This replaces the traditional lathe technology for zipper suitcase which has to lathe three-layer of stripes. The first connecting strip portion  42  of the front zipper fixing coil  4  is sewn on the front chain belt  31 , and the second connecting strip portion  52  of the rear zipper fixing coil  5  is sewn on the rear chain belt  32 , which realize automatic and unmanned sewing. After the machine is adjusted, the sew can be automatic. The sew length is based on the circumference of the case of the trolley bag. Then, the first locking strip portion  41  of the front zipper fixing coil  4  is inserted into the first locking groove  11  of the front rubber strip  1 , and the second locking strip portion  51  of the rear zipper fixing coil  5  is inserted into the second locking groove  21  of the rear rubber strip  2  to fasten the zipper. This replaces the traditional process of sewing the zipper of the zipper suitcase. The front lining  91  is sewn on the third connecting strip portion  62  of the front lining fixing coil  6 , and the rear lining  92  is sewn on the fourth connecting strip portion  72  of the rear lining fixing coil  7 , so that automatic unmanned production can be realized during sewing. After the machine is adjusted, the sew can be automatic. The sew length is based on the circumference of the case of the trolley bag. Then, the third locking strip portion  61  of the front lining fixing coil  6  is inserted into the third locking groove  12  of the front rubber strip  1 , and the fourth locking portion  71  of the rear lining fixing coil  7  is inserted into the fourth locking groove  22  of the rear rubber strip  2  to fasten the lining. This replaces the traditional sew process for zipper suitcase. It can be seen from the above that the structure of this product cancels the manual sewing, so that the zipper suitcase can be automatically produced. 
     Embodiment Two 
     As shown in  FIG. 6 , the difference between this embodiment and the Embodiment One is that: in this embodiment, the thickness and cross-sectional shape of the front rubber strip  1  and the rear rubber strip  2  are adjusted according to the size of the box suitcase. Specifically, the second front rubber strip  1 A and the second rear rubber strip  2 A are used. 
     The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.