As shown in FIG. 14, the hinge device 112 further includes an electric wire 117 connected from the first coil 111 (or the transmitter coil) to a control system of the washing machine 2, which is located in the main body 110 of the washing machine 2. In an embodiment, the transmitter coil is adapted to receive the power from the main body 110 of the washing machine 2 via the electric wire 117 to achieve wireless transmission of power from the transmitter coil to the receiver coil. In a further embodiment, the first coil 111 is adapted to receive a signal from a control system of the electrical apparatus via the electric wire 117 and transmit it to the second coil 121. In another embodiment, the first coil 111 is adapted to transmit a signal received from the second coil 121 to the control system of the electrical apparatus via the electric wire 117.

As shown in FIGS. 10, 14 and 16, the hinge device 112 further includes a second mounting portion 118 mounted on the base 113 and opposite to the mounting portion 114 and a second insertion portion 119 fixed on the second mounting portion 118 and inserted into the receiving groove 122 in the washing machine door or pivotal part 120. In the shown embodiment, the mounting portion 114 is provided under the second mounting portion 118. In another embodiment, the mounting portion 114 is provided above the second mounting portion 118.