Abstract:
A supporting device for a wheeled suitcase includes a positioning member to be mounted on the back wall of the suitcase, and a leg member which has an upper end connected pivotally to the positioning member and a bottom wheel. The leg member is turnable outward from the back wall of the suitcase to be in an operative inclining position and inward to be in a position folded over the back wall. A locking member can lock the leg member in the operative inclining position. The locking member is operable for releasing the leg member.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to a supporting device for a wheeled suitcase, more particularly to a supporting device which cooperates with a bottom wheel for supporting the suitcase in an operative inclined position. 
     2. Description of the Related Art 
     Referring to FIG. 1, a conventional wheeled suitcase is shown to comprise a pair of longitudinally extending storage tubes 11 which have top ends and bottom ends, a U-shaped handle 15 which has two parallel arm portions 10 inserted slidingly into the storage tubes 11 from the top ends, top and bottom plates 14, 12 to mount the arm portions 10 to the top and bottom ends of the storage tubes 11, and roller wheels 13 which are mounted on the bottom end of the bottom plate 12 for movement of the suitcase. 
     For moving the suitcase, one must grasp and pull upwardly the handle 15 to extend the arm portions 10, and tilt the suitcase. When stopping temporarily, the user may release the handle 15 and place the suitcase upright on the ground. To resume movement, the suitcase must be inclined or tilted again prior to the movement of the suitcase by pulling the handle 15. The need to tilt the suitcase each time before the suitcase is to be moved from its upright resting position causes inconvenience to the user. 
     SUMMARY OF THE INVENTION 
     The main object of the present invention is to provide a wheeled suitcase with a supporting device by which the suitcase can be placed in a tilted or inclined stand-by position. 
     According to this invention, a supporting device is provided for a wheeled suitcase which has a suitcase body with a back wall. The supporting device includes a positioning member which is mounted on the back wall of the suitcase body and which has a stop member and a pivot member, and a leg member which has an upper end mounted pivotally to the pivot member and which is turnable outwardly to an operative inclining position relative to the back wall and inward so as to be folded over the back wall. The leg member has a bottom wheel and a receiving space. A locking member is slidably received in the receiving space and has a top engaging end biased upward to be wedged between the stop member and the upper end of the leg member so as to prevent the leg member from turning when the leg member is in the operative inclining position. The locking member is operable to be moved downward to disengage the top engaging end from the stop member and the upper end. 
    
    
     BRIEF DESCRIPTION OF THIS DRAWINGS 
     Other features and advantages of the present invention will become apparent in the following detailed description of a preferred embodiment of the invention, with reference to the accompanying drawings, in which: 
     FIG. 1 is a perspective view of a conventional wheeled suitcase; 
     FIG. 2 is an exploded view of a preferred embodiment of a supporting device according to the present invention; 
     FIG. 3 is sectional view of the preferred embodiment, taken along line III--III in FIG. 2; 
     FIG. 4 is a perspective view of the embodiment of FIG. 2; 
     FIG. 5 is a longitudinal sectional view of the embodiment of FIG. 4 without a positioning member; 
     FIG. 6 is a schematic view illustrating the supporting device when mounted on a wheeled suitcase; 
     FIG. 7 is a schematic view illustrating the suitcase of FIG. 6 when moved; 
     FIG. 8 is a sectional view illustrating the supporting device in an operative inclining position; 
     FIG. 9 is a side view illustrating the supporting device in a folded position; 
     FIG. 10 is a sectional view illustrating the locking member when released from the stop member; and 
     FIG. 11 is a sectional view illustrating the supporting device in the folded position. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to FIGS. 2, 3, 4 and 5, a preferred embodiment of the supporting device according to the present invention is shown to comprise a positioning member 30, a leg member 40 and a locking member 50. With reference to FIG. 6, the positioning member 30 is sleeve mounted on two storage or holding tubes 71 of a handle 70 of the wheeled suitcase 80. The leg member 40 has an upper end connected pivotally to the positioning member 30. The locking member 50 is slidably received in a receiving space 44 of the leg member 40. 
     As best shown in FIG. 3, the positioning member 30 has a generally rectangular shape and an open bottom. Two vertically extending holes 31 are formed respectively in two sides of the positioning member 30 for sleeving on the holding tubes 71. The positioning member 30 is formed with three receiving spaces 32. Two side pivot members 33 and a medial pivot member 34 are provided respectively in the receiving spaces 32. The medial pivot member 34 has a semi-circular cross-section and a first diametral planar face 341 which inclines about 70° relative to a vertical plane. A stop member 35 is provided in the positioning member 30 adjacent to the medial pivot member 34 and has an abutment surface 351 substantially parallel to the back wall of the suitcase. 
     The leg member 40 has a bottom wheel 41 and an upper end which is provided with two side hook members 42 and a medial hook member 43. The receiving space 44 is provided between the upper end and the bottom wheel 41. The hook members 42, 43 have respectively curved grooves 421, 432 to receive turnably the pivot members 33, 34. The curved groove 432 has a semi-circular cross-section and opens at a second diametral planar face 431 of the medial hook member 43. The leg member 40 has a base wall 45 at one side of the receiving space 44, and a cover plate 60 which is positioned at the other side of the receiving space 44 to oppose the base wall 45. The base wall 45 has a press button hole 46 and two screw sleeves 47 formed therein. 
     The locking member 50 has a button part 51 which projects into the press button hole 46 and which is formed with a plurality of knurls 511. Referring to FIG. 8, the locking member 50 has a top engaging end 55 which is biased upward to engage the stop member 35 and the medial hook member 43. A longitudinal groove 54 is formed in the locking member 50. Upper and lower partition plates 57 divide the longitudinal groove 54 of the leg member 40 into upper, medial and lower compartments 543, 542 and 541. A spring 56 is mounted longitudinally in the lower compartment 541. Another spring 561 is mounted transversely in the medial compartment 542. The locking member 50 further has a lower face 531 which is flush with the cover plate 60 of the leg member 40, two edge faces 532 which are indented, and two inclined shoulders 533. 
     Referring again to FIGS. 2, 4 and 5, in assembly, the springs 56, 561 are loaded in the lower and medial compartments 541, 542. The locking member 50 is placed in the receiving space 44 of the leg member 40, with the button part 51 projecting into the press button hole 46. Then, the cover plate 60 is screwed to the base wall 45 via two screws 61 which threadedly couple the cover plate 60 and the screw sleeves 47. After assembly, the top edge 521 of a wall 52 of the locking member 50 abuts a bottom side of the hook member 43 while the inclined shoulders 533 abut the lower edge of the cover plate 60, as best shown in FIG. 5. Finally, the hook members 42, 43 are respectively hung from the pivot members 33, 34. 
     Referring to FIGS. 7 and 8, when the leg member 40 is in an operative inclining position, that is the leg member 40 is turned outwardly relative to the back wall of the suitcase, the hook members 42, 43 turn about the corresponding pivot members 33, 34. When the first and second diametral planar faces 341, 431 are aligned along a common plane, the locking member 50 moves upwardly by the biasing force of the spring 56 so that the top engaging end 55 is wedged between the stop member 35 and the diametral planar faces 341, 431. The abutment surface 551 of the top engaging end 55 tightly abuts the abutment surface 351 of the stop member 35. The upward movement of the top engaging end 55 is limited when the top edges 521 and the shoulders 533 contact the medial hook member 43 and the lower edge of the cover plate 60, respectively. In this situation, the button part 51 is urged to extend into the press button hole 46 by the biasing force of the spring 561. Thus, the leg member 40 is locked in the inclining position by the locking member 50. In this state, since three wheels 41, 73 of the suitcase are rolling on the ground, the suitcase can be pushed or pulled easily. 
     Referring to FIG. 6, when the user stops temporarily, the suitcase can be placed in a tilted stand-by position so that the user can simply pull or push the suitcase to resume walking. 
     Referring to FIGS. 9 and 10, when the suitcase is to be stored, the user can press inwardly and downwardly the button part 51 exposed from the button hole 46. As such, the button part 51 separates from the press button hole 46 and moves downward against the action of the springs 56, 561. Referring to FIG. 11, when the locking member 50 is moved downward, the top engaging end 55 is disengaged from the stop member 35 and the hook member 43 of the leg member 40. Therefore, the leg member 40 can be turned inward to be in a folded position. The second diametral planar face 431 becomes parallel to the abutment surface 351 of the stop member 35. The top engaging end 55 is pressed by the first diametral planar face 341, thus preventing the locking member 50 from moving upward and the button part 51 from moving into the press button hole 46. 
     While the present invention has been described in connection with what is considered the most practical and preferred embodiment, it is understood that this invention is not limited to the disclosed embodiment but is intended to cover various arrangements included within the spirit and scope of the broadest interpretations and equivalent arrangements.