| 摘要 |
A hopper includes a handrail, a treadle, and a spring component, which is installed at the bottom of the hopper and touches the ground. The treadle is placed above the spring component and the handrail is place above the treadle and extends upward. The spring component has upper and lower arc boards and an auxiliary spring component. The upper and the lower arc boards assemble together to form a spring frame. The top of the upper arc board is fixed with the treadle and the lower arc board meets the ground. The auxiliary spring component is placed between the upper and lower arc boards to enhance the spring force of the arc boards as well as structural strength.
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