An Adjustable Safety Device with Quick Return Structure for the Weightlifting Training

摘要

According to statistics, most weightlifting training injuries occur in the training process, and the upper part of the body has most injuries, followed by the waist. For the injuries caused by weightlifting, light injuries harm muscles and joints, and severe injuries may result in permanent disability. The purpose of this study is to provide a protection measure for weightlifting exercise that allows the barbell to be lifted in the same way as the normal weightlifting process, when the force is provided by the user; but when the barbell is lowering, the support is provided from the mechanism of the product, so that the weightlifting unit hangs instead of falling to cause damage. The safety device of this study includes a oneway transmission unit, a winding transmission unit and a very light counterweight unit. When the barbell is lifted, the one-way transmission unit moves in the direction of the barbell without any resistance as the general freewheel. Now the main weight of the barbell is supported by the user, so the purpose of weightlifting training can be achieved. If the user stops the barbell lifting force, the one-way transmission unit generates a reversed supporting force, so that the barbell will not fall due to the user's stopping the force. This can ensure the user's safety during weightlifting training. This study adopts a mechanical structure with low cost, easy installation and a quick-return mechanism to complete the safety measures, which takes into account both the convenience and safety of the user.