Abstract: A wheel rack improvement of a trolley suitcase includes a pair of corner seats and a central seat secured to the lower portion of the suitcase. The corner seats each has a main prop and subordinate prop rotatably secured therein and overlapped each other. The central seat has a footboard rotatably secured by a link and a rotor, a pair of axial pipes spacedly secured to the back of the central seat each including a male pipe and a female pipe axially sleeve with each other. An insertion rod engageable with a positioning hole of the subordinate prop biased by a spring. A steel wire has a first enlarged head retained in a slot of the insertion rod and a second enlarged head retained in a slot of the rotor for controlling the insertion rod the engage or disengage with the positioning hole of the subordinate prop. Therefore, the props may separate with each other to make a four wheels touching the ground.

Abstract: A collapsible handle for a portable luggage is provided. The handle includes an upper seat and a lower seat spacedly secured to the top and lower portions of the back side of the portable luggage, an attachment slidably pivoted to a pair of rectangular recesses of the upper seat, an elongate caster seat including a pair of subordinate casters pivoted on two end which has an arcuate lower surface made engageable with a concaved engaging surface in the top of the lower seat, a pair of telescoped frame having their upper ends inserting through the attachment and secured to a handle grip above the attachment and their lower ends of the outmost portion secured to a pair of cavities at two end of the elongate caster seat and the inner portion respectively biased by a pair of post of a locking member which is in turn biased by a pair of springs inside the elongate caster seat.