Patent ID: 8653385

Claim:
A trolley case, comprising: a case body; and a weight monitoring device mounted on said case body for monitoring a weight of said trolley case, wherein said weight monitoring device comprises: a pressure sensor mounted on said case body for supporting said trolley case when using, which reacts to an intension of a pressure when being applied by the pressure and outputs a corresponding electrical signal, a transmission unit electrically connected to said pressure sensor, which transmits said electrical signal to a corresponding weight value after receiving said electrical signal, and a display module electrically connected to said transmission unit for display said weight value, wherein said weight monitoring device further comprises a switching structure, said pressure sensor is connected with said bottom of said case body via said switching structure, in such a manner that said pressure sensor does not support said trolley case when idle, and by enabling said switching structure, said pressure sensor protrudes outsides said case body to support temporarily for monitoring said weight of said trolley case real-time when using, wherein said switching structure comprises a hinge, and a leg rotatably connected to said case body via said hinge, wherein said leg has a receiving hole vertical to said supporting surface which is leaning with respect to a ground and fully attaching to the ground when supporting said trolley case, so that said receiving hole is vertical to the ground when weighing, said pressure sensor is received inside said receiving hole, and protrudes slightly outside said supporting surface, so as to weigh said trolley case when said supporting surface supports said trolley case, wherein said switch structure further comprises a spring mounted inside said receiving hole for supporting said pressure sensor, so as to prevent said pressure sensor wholly hidden inside said receiving hole.