Door operating apparatus for vehicle

A back-door operating apparatus comprising:

• a back door swingably connected to a vehicle body;
• a wire having a first end connected to one of a vehicle body and the back door and a second end connected to the other one of the vehicle body and the back door;
• a biasing means for always biasing said back door in a door opening direction;
• a electrical winding mechanism installed at one of the vehicle body and the back door and being connected to the second end of said wire so as to wind said wire;
• a lock mechanism restraining a swinging movement of said back door so as to fit said back door with the vehicle body;
• and
• a tension mechanism connected to the first end of said wire and absorbing a loosened amount of said wire.

A back-door operating apparatus comprising:

• a back door swingably connected to a vehicle body;
• a wire having a first end and a second end;
• a winding mechanism installed at one of the vehicle body and said back door, said winding mechanism being connected to the first end of said wire, said winding mechanism temporally winding and releasing said wire;
• a guide pulley installed at the other one of the vehicle body and the back door with respect to said winding mechanism, said guide pulley supporting said wire;
• a biasing member always biasing said back door in a door opening direction;
• and
• a tension mechanism connected to the other end of said wire, said tension mechanism always pulling said wire.

A back-door operating apparatus comprising:

• a back door swingably connected to a vehicle body;
• a wire having a first end connected to a vehicle body and a second end connected to said back door;
• biasing means for biasing said back door in a door opening direction;
• an electrical winding mechanism installed at the vehicle body and connected to the second end of said wire so as to wind said wire;
• a lock mechanism restraining a swinging movement of said back door so as to fit said back door with the vehicle body;
• and
• a tension mechanism installed on said back door and connected to the first end of said wire so as to absorb a loosened amount of said wire.