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Nowadays, the bars of triple horizontal bars, including the three horizontal bars, are smooth surface and hard to grasp for children and the elderly because they don’t have enough strength to grasp with their hands. We redesign the lowest bar and middle one with four and twelve flutes separately. Because of the friction effect on the surface of the bars, it is easier for users to grasp them. Besides, users in different ages can choose the bar according to their strength. Therefore, the triple horizontal bars can be used for all ages.
National Cheng Kung University