Hidden device in a multifunctional sports shoe

A hidden device in a multifunctional sports shoe, comprising:

• a roller mechanism, being disposed under a bottom sole of the shoe;
• and
• an actuation mechanism, being attached to the roller mechanism;
• wherein, the roller mechanism further comprising
• an upper base frame with two opposite longitudinal lateral sides, being fixedly attached to the bottom sole, and each of said two lateral sides near both ends thereof having an elongated sliding groove respectively;
• a lower base frame with two opposite longitudinal lateral sides, being disposed below the upper base frame, each of said two lateral sides near both ends thereof having an elongated sliding groove respectively corresponding to the upper base frame;
• four pairs of cross arms, each of said four pairs of cross arms being composed of a first actuating arm and a second actuating arm, the first actuating arm at an upper end thereof being slidably attached to one of the sliding grooves on the upper base frame by way of a connecting pin and at an lower end thereof being pivotally attached to the lower base frame, the second actuating arm at a lower end thereof being slidably attached to one of the sliding grooves on the lower base frame adjacent the preceding sliding groove on the upper base frame and at an upper end thereof being pivotally attached to the upper base frame, said first and second actuating arms movably engaging with each other via a center pivot;
• a roller frame, being fixedly attached to the bottom sole by way of threaded fasteners, and being disposed in the upper base frame;
• and
• a plurality of skating rollers, being lined up and rotatably mounted in the roller frame;
• and
• the actuation mechanism further comprising
• a shaft with two ends, being disposed next to an end of the lower base frame transversely;
• a ratchet wheel, being fixedly attached to the shaft;
• two rolling wheels, being fixedly attached to the shaft near both ends thereof respectively;
• two elastic cords, being disposed at said two lateral sides of the upper base frame respectively, each of said two elastic cords being wound on the respective rolling wheel in a state of stretching, and engaging with two of said four pairs of cross arms at either side;
• a rotary disk, being joined to an end of the shaft;
• a turning stem, being attached to the rotary disk;
• a ratchet stop, being a flat piece and detachably engaging with the ratchet wheel;
• and
• a press knob, connecting with the ratchet stop for being operated to move the ratchet stop;
• whereby, while the skating rollers are to be used for sports, the press knob is pushed to actuate the ratchet stop away the ratchet wheel, and the elastic forces of the elastic cords cause said four pairs of cross arms to be pulled inward and result in the lower base frame moving upward to a preset position and exposing the skating wheels for skating;
• and while the skating rollers are not in use, the turning stem on the rotary disk can be turned to cause the respective elastic cord being wound on the respective rolling wheel so as to move said pairs of cross arms outward downward to a stowed position.