Abstract: 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.

Abstract: 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.

Abstract: A roller skate includes a boot, a connection frame fastened to the outsole of the boot, an expandable frame fitted with the connection frame, a wheel frame fastened to the connection frame and provided with a plurality of wheels and a brake shoe, and an elastic member located in the connection frame by the expandable frame. The elastic member serves as a shock absorber of the roller skate.

Abstract: A dual-purpose sports footwear is formed of a boot, an elastic plate, an arcuate outer plate, and a wheel mount plate. The boot has an arcuate inner plate which is detachably fastened to the elastic plate. The arcuate outer plate is detachably fastened to the elastic plate. The boot, the elastic plate and the arcuate outer plate form a jumpshoe. The wheel mount plate is provided with a plurality of wheel sets and is detachably fastened to the arcuate inner plate of the boot to form a roller skate.

Abstract: A springy sports shoe includes a boot which is fastened in the sole to a springy body and an elastic body by a fastening body. The fastening body is formed of an upper body which is fastened to the sole the boot, and of a lower body which is fastened to the springy body. The elastic body is retained by the springy body.

Abstract: An exercise shoe includes a shoe body and a frame fastened to the underside of an outsole of the shoe body. The frame is provided therein with a circular body in which a spring is located such that both ends of the spring are engaged with the retaining rings of two control rod members, and that the spring can be expanded or compressed by the control rod members so as to adjust the resilience of the frame. The frame is provided with a skidproof bottom to prevent the exercise shoe from skidding on a surface.