Disclosed herein are exemplary embodiments of a stand assembly for supporting a portable terminal on a support surface. In one exemplary embodiment, a stand assembly generally includes a housing configured to be coupled to a body of a portable terminal and a leg having a first end portion rotatably coupled to the housing. A first biasing device is operable for applying a biasing force to urge the leg to rotate from a first position to a second position. The stand assembly also includes a sliding cam and a rotating cam. The rotating cam is operable for pushing and sliding the sliding cam during the rotation of the leg from the first position to the second position. A second biasing device is operable for applying a biasing force to urge the sliding cam toward the rotating cam. A locking button is operable for maintaining the leg in the first position.