Patent ID: 6880964

Claim:
A chain-controlled lamp stand with multi-stage light modulation comprising: a circular holder for receiving a lamp, said circular holder provided with a center tongue at the bottom, said circular holder and said center tongue respectively connected with two electrodes of said lamp; a first base and a second base assembled under said circular holder; a light modulation circuit board assembled under said first and said second base, said light modulation circuit board provided with a multi-stage connecting strip, said connecting strip able to change and control voltage waveform, said connecting strip having the other end provided with a resistance, a DIAC, a capacitor and a TRIAC; and a chain controlled switch installed between said first base and said second base, said chain controlled switch comprising a pull chain, a rotatable disc actuated to rotate by said pull chain, a rotatable rod engaged with said rotatable disc to rotate together, said rotatable rod provided thereon with a first contact strip, said contact strip of said rotatable rod contacting with said connecting strip on said light modulation circuit board, said contact strip of said rotatable rod contacting with said connecting strip of said light modulation circuit board to control brightness of said lamp and conditions of electric connection and disconnection, said rotatable disc combined with a torque spring, said torque spring forcing said rotatable disc to recover its original position after said rotatable disc is turned around, said chain-controlled switch able to be operated repeatedly.