An electrical connection apparatus uses a flat cable for electrically connecting a fixed member and a movable member. The flat cable has one end secured to the fixed member and the other end secured to the movable member. When the movable member rotates, the flat cable is reeled on or supplied from the movable member to permit a desired rotation of the movable member. Such an electrical connection apparatus is used in a car steering, for example. The movable member, once mounted in a car steering, must be rotatable substantially equally in opposite directions from a neutral position thereof. If the movable member is originally rotated in either direction, a great difference is produced between rotatable amounts in opposite directions. That is, a driver can rotate the steering much in one direction but cannot rotate it sufficiently in the other direction. This is very dangerous in driving the car.
In order to avoid this, a known prior art system includes a positioning mechanism which serves as a relative positioning index between a fixed member and a movable member to ensure a correct mounting of the electrical connection apparatus type in various devices.
However, regardless of the use of such a relative positioning mechanism between fixed and movable members, there still remains a problem of an incorrect mounting of the electrical connection apparatus itself. If the incorrect mounting is such that the rotatable amount of the movable member in the supply direction of the flat cable is smaller than a correct amount, its rotation itself in this direction is possible beyond a limit amount although the flat cable may be bent or twisted or an increased resistance against the rotating force may be fed back to the driver. However, if the incorrect mounting is such that the rotatable amount of the movable member in the reel-on direction of the flat cable is smaller than a correct amount, the movable member, when rotated in this direction, is locked at a position and cannot rotate further. Therefore, when the apparatus is used as a steering of a car, the incorrect mounting of the movable member makes it impossible for a driver to rotate the steering handle in this direction. This is very dangerous and sometimes invites an accident resulting in injury or death.