| 摘要 |
PROBLEM TO BE SOLVED: To provide a door open-and-close biasing device, which can be improved in operability.SOLUTION: A door open-and-close biasing device includes a front side lever 75, in which a power point (an upper hinge support shaft 74) is placed in such a way that a power point distance, i.e. the distance between the power point where a control force of an operation part 42 is applied and a rotary fulcrum (a rotary support shaft 75J), to be greater than the maximum value of an action point distance, i.e. the distance between the rotary fulcrum and an action point (a contact point of a door's forward protrusion 24A), enabling a closing biasing force, which is greater than the control force input to the front side lever 75, to be applied to the door's forward protrusion 24A. Similarly for a rear side lever 76, an opening biasing force, which is greater than the control force input to the rear side lever 76, can be applied to a door's tail protrusion 24B. With this, opening and closing operation of a sliding door 12 can be performed with a relatively light force, enabling improvement of operability. |
