| 摘要 |
a lever rotatably connected by means of a first pin to the top end of a main supporting bar; a load device installed between the one side of a supporting member and the lower portion of the front end of the lever and fixedly connected on the both sides thereof by means of second and third pins; and a fixing hole inserted into the lower portion of the main supporting bar. The one side of the load device is rotatably connected to the top portion of the main supporting bar, and the lever is installed between the supporting member and the other side of the load device.
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