Abstract: The luggage device has an extendible handle threaded in at least a tubular sleeve. An elastic element is housed in the tubular sleeve, supporting from below a connecting rod. A bottom end of the connecting rod is configured with a brake pad. A blind hole is configured on the extendible handle where a spring and a steel ball are housed to interact with a through hole of the tubular sleeve. When the extendible handle is pushed downward, the blind hole is aligned with the through hole of the tubular sleeve and the steel ball is pushed by the spring into the through hole, thereby detachably locking the extendible handle. In the mean time, the connecting rod is driven downward and the brake pad is pressed against the wheel to prevent it from rolling.

Abstract: An improved structure of a plug-in fastening device is disclosed. An improved structure of a plug-in fastening device having a female fastener and a male fastener, characterized in that the two sides of the housing of the female fastener are provided with resilient legs and the interior of the housing is provided with a positioning sliding block and a fastening rod, by means of the top urging and pressing of a compression spring, via the pushing of the controlling button positioned at the housing of the female fastener, the protruded block of the fastening rod contacts with a positioning sliding block zigzag recess and a slot, thereby the dislocation of the fastening device due to external force is prevented.

Abstract: A luggage case includes a primary case provided with a plurality of male fasteners each including a base and a plug, the base being riveted on the primary case and having a passage going through the primary case, and a secondary case provided with a plurality of female fasteners riveted on the secondary case, each of the female fasteners having a recess adapted to receive the plug, a neck portion having two holes at two opposite sides thereof, and two positioning arms at the two opposite sides thereof each having a protuberance engageable with the holes of the neck portion, whereby the secondary case can be easily engaged or disengaged from the primary case.