Suitcase bottom shell and suitcase having bottom shell

Abstract

A suitcase bottom shell and the suitcase having a bottom case are provided. The suitcase bottom shell includes a shell body; the shell body is provided with universal wheels and further provided with storage grooves; and the universal wheels are stored in the storage grooves. By arranging the storage grooves on the shell body, the universal wheels are stored in the storage grooves when the suitcase needs to be laid aside, and the universal wheels are taken out from the storage grooves when the suitcase needs to be used to achieve a stability as well as convenience and efficiency; by arranging limiting mechanisms, the universal wheels keep unfolded for sliding without being stored by mistake when the suitcase is in normal use, or keep stored without extending and sliding by accident when the suitcase is laid aside.

What is claimed is: 
     
         1 . A suitcase bottom shell, comprising a shell body, wherein the shell body is provided with universal wheels and is further provided with storage grooves; the universal wheels are stored in the storage grooves; the shell body is internally provided with connecting columns extending out of the shell body; the universal wheels are articulated on the connecting columns; and the universal wheels are rotatable to an unfolded state or a stored state on the connecting columns. 
     
     
         2 . The suitcase bottom shell according to  claim 1 , wherein limiting mechanisms for limiting rotation directions of the universal wheels when the universal wheels are in a folded state or the stored state are disposed between the connecting columns and the universal wheels. 
     
     
         3 . The suitcase bottom shell according to  claim 2 , wherein each of the limiting mechanisms comprises a first limiting surface and a second limiting surface, wherein the first limiting surface and the second limiting surface are disposed at ends of each of the universal wheels; the connecting columns have a tendency of always retracting into the shell body; and the first limiting surfaces are supported against an upper end of the shell body when the universal wheels are unfolded, and the second limiting surfaces are supported against the upper end of the shell body when the universal wheels are stored. 
     
     
         4 . The suitcase bottom shell according to  claim 2 , wherein elastic mechanisms allowing the connecting columns to have the tendency of always retracting into the shell body are disposed between the connecting columns and the shell body; each of the elastic mechanisms comprises a first spring disposed on each of the connecting columns; each of the first springs has a first end butted against a pressing block disposed below the each of the connecting columns, and a second end butted against a first lug boss disposed on the shell body; and the connecting columns are connected to the pressing blocks. 
     
     
         5 . The suitcase bottom shell according to  claim 4 , wherein each of the pressing blocks is provided with a second lug boss, and ends of the first springs are sleeved on the second lug bosses. 
     
     
         6 . The suitcase bottom shell according to  claim 4 , wherein a top of each of the pressing blocks is provided with a recess, and bottoms of the connecting columns extend into the recesses to connect with the recesses. 
     
     
         7 . The suitcase bottom shell according to  claim 4 , wherein the pressing blocks and the connecting columns are integrated. 
     
     
         8 . The suitcase bottom shell according to  claim 4 , wherein a bottom of each of the first lug bosses is provided with a third lug boss, and the first springs are sleeved on the third lug bosses. 
     
     
         9 . The suitcase bottom shell according to  claim 2 , wherein elastic mechanisms allowing the connecting columns to have the tendency of always retracting into the shell body are disposed between the connecting columns and the shell body; and each of the elastic mechanisms comprises a limiting ring disposed on each of the connecting columns and located within the shell body, and a second spring disposed between the shell body and the limiting ring. 
     
     
         10 . The suitcase bottom shell according to  claim 9 , wherein each of the second springs has a first end connected to the shell body and a second end butted against each of the limiting rings. 
     
     
         11 . The suitcase bottom shell according to  claim 9 , wherein each of the second springs has a first end butted against the shell body and a second end connected to each of the limiting rings. 
     
     
         12 . The suitcase bottom shell according to  claim 9 , wherein both ends of each of the second springs are connected to the shell body and each of the limiting rings respectively. 
     
     
         13 . The suitcase bottom shell according to  claim 9 , wherein both ends of each of the second springs are butted against the shell body and each of the limiting rings respectively. 
     
     
         14 . The suitcase bottom shell according to  claim 1 , wherein surfaces of the storage grooves close to the universal wheels are cambered surfaces. 
     
     
         15 . A suitcase, wherein the suitcase is applicable to the suitcase bottom shell according to  claim 1 . 
     
     
         16 . The suitcase bottom shell according to  claim 3 , wherein elastic mechanisms allowing the connecting columns to have the tendency of always retracting into the shell body are disposed between the connecting columns and the shell body; each of the elastic mechanisms comprises a first spring disposed on each of the connecting columns; each of the first springs has a first end butted against a pressing block disposed below the each of the connecting columns, and a second end butted against a first lug boss disposed on the shell body; and the connecting columns are connected to the pressing blocks. 
     
     
         17 . The suitcase bottom shell according to  claim 3 , wherein elastic mechanisms allowing the connecting columns to have the tendency of always retracting into the shell body are disposed between the connecting columns and the shell body; and each of the elastic mechanisms comprises a limiting ring disposed on each of the connecting columns and located within the shell body, and a second spring disposed between the shell body and the limiting ring. 
     
     
         18 . The suitcase bottom shell according to  claim 2 , wherein surfaces of the storage grooves close to the universal wheels are cambered surfaces. 
     
     
         19 . The suitcase bottom shell according to  claim 3 , wherein surfaces of the storage grooves close to the universal wheels are cambered surfaces. 
     
     
         20 . The suitcase according to  claim 15 , wherein limiting mechanisms for limiting rotation directions of the universal wheels when the universal wheels are in a folded state or the stored state are disposed between the connecting columns and the universal wheels.