A rack structure for a rack assembly, comprising:
- a base shaft including a first end surface, an opposite second end surface, an inserting recess recessed from the first end surface to the second end surface, a connecting surface located between the first and second end surfaces, and at least three connecting portions which are mounted on the connecting surface and inclined from the first end surface to the second end surface;
- and
- at least three connecting arms each including:
- a jointing portion formed at one end thereof and to be connected to the connecting potion, a support portion formed at another end opposite the jointing portion, and a plurality of hanging holes defined between the jointing portion and the support portion, wherein an extension plane of the second end surface is located between the support portion and the first end surface;
- wherein the connecting arms are connected to the base shaft and capable of being switched between a stretched-out position and a folded position, the base shaft is provided with:
- two positioning protrusions which are located at two opposite edges of each of the connecting portions, and an elongated slot which is formed in each of the connecting portions;
- the jointing portion of each of the connecting arms is slidably and pivotally connected to the connecting portions of the base shaft, and includes a holding chamber for holding the connecting portions, the holding chamber includes two lateral surfaces, a bottom surface connected between the two lateral surfaces, and an open end which opens toward the connecting surface and is defined by the two lateral surfaces and the bottom surface, two positioning cavities are formed in the two lateral surfaces and located at the open end to selectively engage with or disengage from the positioning protrusions;
- a pivot is inserted in the jointing portions of the connecting arms and the elongated slot of the base shaft, respectively;
- when the connecting arms are in the stretched-out position, the positioning protrusions of the base shaft are engaged in the positioning cavities of the connecting arms to prevent the connecting arms from pivoting about the pivot with respect to the connecting portions of the base shaft;
- when the connecting arms are in the folded position, the positioning protrusions of the base shaft are disengaged from the positioning cavities of the connecting arms, so as to allow the connecting arms to pivot about the pivot with respect to the connecting portions of the base shaft.