Gravity generating floor lamp

This is a from Virginia Tech in the United States, the latest environmental design, different from the previous product, the lamp is using the earth's gravity to generate electricity.

It has a Built-in gravity hammer is fixed on the cylinder, a spiral, and when light bulbs just prior to the gravity hammer uplifted to the top floor to make it along the spiral body drooping naturally, you can use the gravity hammer rotation to power and light at the bottom of the 10 LED lights. The falling process can last for 4 hours, and because the floor lamp is wrapped with organic glass, the noise generated by the mechanical movement can be greatly reduced.

Source: patent home