Apparatus for switching two rollers of a skate between an in-line position and a side-by-side position

A roller skate comprising:

• a boot (10) comprising a sole (12) formed with an aperture (121) and bores (123) arranged around the aperture (121);
• a beam (20) comprising an orifice (22), two recesses (24) on two opposite sides of the orifice (23), and two stepped holes (26) in communication with the recesses (24);
• a fastening unit (30) comprising a threaded bolt (32) inserted in the orifice (22) and the aperture (121) and a nut (34) engaged with the threaded bolt (32);
• multiple supporting elements (42) each of which comprises an arched portion (423) for supporting a roller (44) and a positioning portion (421) formed on the arched portion (423) and insertable in a selected one of the recesses (24);
• and
• multiple connecting units (50) each of which comprises:
• a detent (54) movable in a corresponding one of the stepped holes (26);
• and
• a spring (56) compressed between the detent (54) and a shoulder of a corresponding one of the stepped holes (26) so that the spring (56) tends to synchronously push the detent (54) in a selected one of the bores (123) to prevent the beam (20) from rotation relative to the sole (10) and insert one of the positioning portions (421) in one of the recesses (24) to prevent one of the supporting elements (42) from rotation relative to the beam (10).