(US5072163-A)      The electric system includes a battery mounted in the vehicle body, a controlling device mounted in the vehicle body and having two switches, and a positive/negative switching device mounted in the vehicle body and electrically connected to the battery and the controlling device. The switching device has an output member which includes two output parts. The switching device assumes, when the first switch of the controlling device is turned ON, a first condition wherein the two output parts are charged positive and negative respectively, and assumes, when the second switch of the controlling device is turned ON, a second condition wherein the two output parts are charged negative and positive respectively.    Two electric devices are mounted in the door and have an input member which includes two input parts. The first electric device is energised only when the two input parts are charged positive and negative respectively, and the second electric device is energised only when the two input parts are charged negative and positive respectively. The feeding system further comprises a member for electrically connecting the two output parts to the two input parts.    USE -   For door locks, power windows, etc.. @(12pp)@)    (GB2233173-B)      An electric system in a structure which includes a first body and a second body movable relative to the first body, comprising: an electric power source mounted in the first body and producing direct current; a controlling device mounted in the first body and having at least first and second switches; a positive/negative switching device mounted in the first body and electrically connected to the electric power source and the controlling device, the switching device having an output means which includes first and second output parts, the switching device assuming, when the first switch of the controlling device is turned ON, a first condition wherein the first and second output parts of the output means are charged positive and negative respectively, and assuming, when the second switch of the controlling device is turned ON, a second condition wherein the first and second output parts of the output means are charged negative and positive respectively; electric drive means for driving, when the first switch of the controlling device is turned ON, the second body in one direction relative to the first body, and driving, when the second switch of the controlling device is turned ON, the second body in the opposite direction relative to the first body; first and second electric devices mounted in the second body and having an input means which includes first and second input parts, the first electric device being energised only when the first and second input parts are charged positive and negative respectively, the second electric device being energised only when the first and second input parts are charged negative and positive respectively; and means for electrically connecting the first and second output parts of the output means to the first and second input parts of the input means, the said means being an electric connector which comprises: a first connector part mounted to the first body and having therein first and second contact pins which serve as the first and second output parts, and a second connector part mounted to the second body and having therein first and second contact pins which serve as the first and second output parts, and a second connector part mounted to the second body and having therein first and second contact pins which serve as the first and second input parts, wherein the first and second connector parts are engaged to establish electric connection between the corresponding contact pins thereof only when the second body assumes a given position relative to the first body.