Abstract: An adjustable roller skate structure in which the front portion of the shoe ridge is secured to the front body and a longitudinal tooth track is provided on the top surface of the shoe ridge. Two edges on the sides of the shoe ridge are provided with guided track for the left and the right rear bodies to be inserted thereto and moved along. When the left and right rear bodies are put together, a latching block is pivotally connected between the top surface and the lower end of the rear casing. The latching block works like a seesaw and the pivotal pin of the latching block is parallel to the shoe ridge. The bottom surface of the latching block is also provided with a plurality of teeth for selectively engaging the tooth track of the shoe ridge. A user presses on the latching block from a hole in the rear casing so that the end with the tooth is raised up, thereby allowing the rear bodies to move along the guided track for adjustment, so as to adapt the skate to the size of the user.

Abstract: An improved structure for roller skate in which the installation and the structure of the single-row rollers are improved. The in-line rollers in the conventional roller skate are redesigned so that the rollers can be installed on the left and the right hand sides of the shoes to form a dual-row roller skate. The structure can also be modified to have a single roller in the front and dual rollers in the rear, or the rollers of the structure can also be arranged in a single row. Such configuration allows a beginner to use a dual-row four-wheel roller skate for balanced practice, and then the roller skate can be changed into a three-wheel type when the user is in his intermediate stage. Finally, the user can be advanced by using the two-wheel in-line structure. The entire practicing process requires only one pair of roller skates, therefore, it is an economical and practical roller skate structure.