Abstract: A retractable handle locating structure which includes two sleeves, two sliding tubes slidably inserted into the sleeves and joined by a transverse handgrip outside the sleeves, and two gravity-induced locating elements mounted inside the sliding tubes for locking the sliding tubes, each gravity-induced locating element including a heavy pendulum pivoted to the inside of one sliding tube, and a curved locating rod having a fixed end connected to the heavy pendulum, and a free end inserted into one locating hole on one sliding tube and, the free end of each curved locating rod being forced in and out of one of a longitudinal series of locating holes on one sleeve by the gravity weight of the respective heavy pendulum when the travel bag is tilted.

Abstract: A multipurpose block toy comprised of a set of blocks, a set of connecting rods and a set of rollers, wherein said blocks can be separately used in playing the game of domino effect or the game of teaching and learning; said blocks, said connecting rods and said rollers can be simultaneously used in playing the game of building and the game of domino effect.