ISBN-13: 9786200295415 / Angielski
Gravity powered source is LED-lit floor lamp combines human power and gravity to create a lighting source that will work for 100 years or so, and never need to be plugged in. the lamp has a weight that is raised every 1 hour or so as it slowly descends, the downward motion is converted to torque via a chain and sprocket the torque is over driven by set of gears and output for that spins a set of dynamo, enlightening LEDs. The apparatus includes a chain and sprocket mechanism which is attached to gear trains. A chain preferably of a bicycle is hanged on the sprocket. Both the ends of the chain are set free. The weight is then put on one side of the chain and that particular side descends thus revolving the gears and transferring the motion to the subsequent gear train. Due to this, the dynamo which is attached at the end too revolves. LED lights are connected to the dynamo which thus glows due to the torque generated because of the high speed rotation.