Trunk case assembly

A trunk case assembly comprising:

• a case body having a side face, a pair of engaging members and a positioning device which are fixed respectively to an upper portion and a lower portion of said side face;
• a collapsible chair having first and second rectangular frames, each of said rectangular frames having an upper section, a lower section, and two side sections connecting said upper and lower sections, said rectangular frames being connected pivotally to one another at said side sections thereof in a scissors configuration, said lower sections of said rectangular frames engaging detachably said positioning device when said rectangular frames are in a collapsed position, said collapsible chair further having an elongated cloth with two end portions each end connected to a respective one of said upper sections of said rectangular frames to serve as a seat of said collapsible chair when said rectangular frames are in an extended position;
• and
• a pair of crank arms, each having a first end connected pivotally to a respective one of said engaging members, and a second end connected pivotally to a respective one of said side sections of said first rectangular frame in order to connect said collapsible chair to said case body.