| 摘要 |
(Task) the present invention relates to a belt length adjustor not taking excessive load on a belt tightening hook. (Solution) the a belt length adjustor comprises: a pair of side unit formed parallel at predetermined gap; a first and a second connection units respectively connected to the lengthwise ends of the side unit; and a belt tightening hook loosely fitted into the slits respectively formed along the longitudinal direction of the side unit and moving inside the space surrounded the pair of the side units and the first and the second connection units in a direction closing to the first and the second connection units. The belt tightening hook is maintained inside the slits by a non-circular cross-section shaft unit formed at both ends, forms a control unit for controlling the rotation of the side unit inside the slits and prevents itself from taking excessive load because pitching of the belt tightening hook is regulated though the side unit when the belt wound on the belt tightening hook gets tension in the direction closing to one end of the first and the second connection units. |
