| 摘要 |
PURPOSE:To obtain a load change pattern in the form of a rectangular wave by constituting the titled device by a load rod having at least one weight receiver and by an elevating body having an elevating receiver which makes a weight laid on the weight reciver and removed therefrom and moves vertically in relation to the load bar. CONSTITUTION:An automatic load changing device is constituted by a weight receiver 1, an elevating reciver 2, a load rod 3, an elevating body 4 and a weight 5. An upper-limit position 71 and a lower-limit position 73 are set so that the elevating receiver stops at these positions. First the elevating body 4 is positioned at the lower-limit position 73 and the weight 5 is laid on the reciver 1. After a load time passes, the elevating body 4 is elevated to remove the weight 5 from the receiver 1, and thereby the load rod 3 is unloaded. After a prescribed time, the elevating body 4 is lowered to load the load rod 3 with the weight 5 again. By repeating these opeations, a changing load can be applied to the load rod 3. |
