| 摘要 |
A variable resistance device for use in training a swimmer includes an L-shaped scoop member, a belt and a surface area varying mechanism. The L-shaped scoop member is formed out of a relatively non-reflexible sheet of plastic material and has a support portion and resistance portion. The support portion is substantially a truncated triangle with a top edge and a bottom edge. The resistance portion is substantially a rectangle with a flat surface area, a first edge and a second edge which is contiguous with the bottom edge of the support portion. The resistance portion has a rectangular slot of a first cross-section. The belt is detachably coupled to the swimmer's torso and is hingedly coupled to the support portion of the L-shaped scoop member adjacent to the top edge thereof. The L-shaped scoop member is pivotally coupled to the belt in order not to interfere with the swimmer's stroke. The surface area varying mechanism includes a sliding member, two mounts and a securing mechanism. The sliding member is substantially a rectangle of a second cross-section which is larger than the first cross-section of the rectangle slot. The two mounts slidably couple the sliding member to the resistance portion. The swimmer selects the position of the sliding member to obtain the effective resistance of the flat surface area of the resistance portion of L-shaped scoop member to the swimmer. The securing mechanism secures the sliding member to the two mounts at the selected position.
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