| 摘要 |
A skate (10) is provided which includes a boot portion having a base portion (14) and a boot (12), a first member (42) pivotably connected at an upper longitudinal end thereof to the base portion (14), a second member (44) pivotably connected at an upper longitudinal end thereof to the base portion (14) and pivotably connected to the first member (42), a first wheel (16) mounted on the first member (42) at a lower longitudinal end thereof, a drive wheel (18) mounted on the second member (44) at a lower longitudinal end thereof, the drive wheel (18) having a concentrically mounted pinion (53), and an elongate driving mechanism (46) pivotably connected to the boot portion and adapted to operatively engage with the pinion (53). The skate (10) is movable between an expanded configuration wherein the base portion (14) is spaced from the first wheel (16) and the drive wheel (18) and a contracted configuration wherein the base portion (14) is adjacent the first wheel (16) and the drive wheel (18). The arrangement is such that when the skate (10) moves from the expanded configuration to the contracted configuration, the angle between the base portion (14) and a plane passing through the axes of rotation of the first wheel (16) and the drive wheel (18) remains substantially constant and the driving mechanism (46) effects rotation of the pinion (53) and thereby transfers a propulsion force to the drive wheel (18). |
