Patent ID: 7533926

Claim:
A vehicle device comprising: a guide rail attached to a vehicle body and having a curved portion; a roller arm unit rotatably mounted on a sliding door, said roller arm unit having cable pulley means and rollers slidably engaged with the guide rail; said pulley means having at least three pulleys; a power unit provided in the sliding door; a door-opening cable ( 20 ) extending from the power unit engaging an upper portion of a rim of a first pulley of said three pulleys, the first pulley coaxially mounted with the roller arm unit on the sliding door; said door opening cable having a first tip end fixed to a portion of the vehicle body adjacent to a first end of the guide rail and distal from a door opening of the vehicle by way of the cable pulley means, said door-opening cable being configured to slide the sliding door in a door-opening direction by being taken up by the power unit while a door closing cable is payed out from the power unit; a door-closing cable ( 21 ) extending from the power unit engaging a lower portion of the rim of the first pulley and having a second tip end fixed to a portion of the vehicle body adjacent to a second end of the guide rail and proximate to the door opening by way of the cable pulley means, said door-closing cable being configured to slide the sliding door in a door-closing direction by being taken up by the power unit while the door-opening cable is payed out from the power unit; said first pulley located on said roller arm unit relative to the guide rail and the first tip end so that when said door-opening cable and door-closing cable are engaged on said three pulleys a length of the door-opening cable contacting the upper portion of the rim of the first pulley becomes shorter as it is taken up by the power unit while the roller arm unit is moving around the curved portion and the door-closing cable contacting the lower portion of the rim of the first pulley becomes longer as it is payed out by the power unit while the roller arm unit is moving around the curved portion; and wherein the change of said lengths contacting the rim of the first pulley prevent an additional load being applied to the wire drum as the roller arm unit moves around the curved portion.