Abstract

As shown in FIGS. 1-3, the permanent magnet 8 is fixed on the one of the suspension rods 9 and located between the two coils 6 of the two electromagnets 1. To make the chair seat 12 which is originally at rest rock, the electromagnetic rocking chair will be powered on first, and then a rocking button on the control panel (not shown) will be pressed down. After that, the wires a, b will alternately produce higher and lower electric levels (triodes Q1, Q2, Q3 and Q4, Q5, Q6 work alternately) to produce an alternately changing magnetic field within the coils 6 of the electromagnet 1, and the alternately changing magnetic field will push and pull the permanent magnet 8, making the chair seat 12 move back and forth. When the chair seat 12 rocks to a predetermined check point, the corresponding displacement sensor 3 will send a signal to the control circuit provided on the circuit board 2, at this moment, the control circuit provided on the circuit board 2 will change the mode of supplying power to the wires a, b, making the wires a, b produce a constant electric level instead of the previous alternate electric level. Therefore, the coils 6 of the electromagnet 1 will produce a constant magnetic field to keep pushing and pulling the permanent magnet 8, thus gradually adding force to the chair seat 12 to make the chair seat 12 have greater amplitude and ensure the chair seat 12 to swing more freely.

IPC Classes  ?

• A47D 13/10 - Rocking-chairsSwings
• A63G 9/16 - Driving mechanisms, such as ropes, gear, belt, motor drive