Patent ID: 7917996

Claim:
An opening-and-closing mechanism comprising: two parallel and opposite supporting members with an intermediate member disposed between the two supporting members in a direction perpendicular to the parallel direction of the two supporting members, such that the two supporting members and the intermediate member are rotatable about a rotation axis, wherein the rotation axis is in a direction parallel to the intermediate member; a first damper, disposed between a first one of the supporting members and the intermediate member, for generating resistance against rotation during a first portion of rotation of the two supporting members in a first direction; a second damper, disposed between a second one of the supporting members and the intermediate member, for generating resistance against rotation during a second portion of rotation of the two supporting members in a second direction, wherein the second direction is opposite to the first direction and the first portion of rotation is different from the second portion of rotation; and rotation-restricting portions formed in a predetermined region at each end of the intermediate member for restricting rotation ranges of the first and second dampers, wherein the rotation-restricting portions are depressed regions in a direction perpendicular to the rotation axis.