Collapsible luggage trolley

A collapsible luggage trolley, comprising:

• a support means for supporting luggage thereon;
• a wheel means;
• a pair of outer tubes securely attached to the support means and each including a lower stop projecting inwardly from a lower portion of a peripheral wall thereof, each said outer tube further including a positioning hole defined in the peripheral wall thereof;
• a pair of inner tubes respectively telescopically received in the outer tubes and each having a lower end and an upper end, each said inner tube further including an upper engaging hole and a lower engaging hole defined in a periphery thereof;
• a handle securely mounted to the upper ends of the inner tubes to move therewith;
• a telescopic device including:
• a pair of lower mounting members respectively mounted in said outer tubes in a position above the lower stops,
• a pair of upper mounting members respectively securely mounted in said inner tubes in a position above the associated lower mounting member,
• a pair of first elastic members each having a first end attached to the associated upper mounting member and a second end attached to the associated lower mounting member,
• a pair of upper stops respectively securely mounted to said upper ends of said outer tubes, each said upper stop being mounted around the associated inner tube yet allowing vertical movement of the inner tube therein, and
• a pair of restraining members respectively securely mounted around the lower ends of the inner tubes to move therewith;
• an engaging device including:
• a first engaging tube and a second engaging tube respectively mounted around the outer tubes, each of the first and second engaging tubes having an opening defined in a periphery thereof and in alignment with the positioning hole of the associated outer tube, and
• a first mounting section, a mediate receiving section, and a second mounting section provided between the first and second engaging tubes in sequence, and
• a control device including:
• a slide button,
• a pivotal block mounted in the mediate receiving section and securely attached to and thus pivotally actuatable by the slide button,
• two latch members respectively mounted in the first and second mounting sections, the latch members being attached to the pivotal block and thus slidable in the first and second mounting sections for releasably engaging with one of the upper and lower engaging holes of the associated inner tubes and the positioning hole of the associated outer tube,
• two second elastic members for biasing the latch members to respectively engaging with one of the upper and lower engaging holes of the associated inner tubes and the positioning hole of the associated outer tube;
• wherein when the trolley is in an extended position, the latch members respectively engage with the upper engaging holes of the associated inner tubes and the positioning holes of the associated outer tubes while the restraining members contact with the upper stops, and when the trolley is in a collapsed position, the latch members respectively engage with the lower engaging holes of the associated inner tubes and the positioning holes of the associated outer tubes while the restraining members rest on the lower stops.