Opening and closing mechanism of hinged pair of bodies

A mechanism for biasing a first body pivotably mounted to a second body to swing toward an open position thereof from closed position, said biasing mechanism comprising:

• a link-arm member connected between said first and second bodies, one end of which is pivotally coupled to said first body while the other end is relatively movably coupled to said second body, said other end of the link-arm member being arranged to move between first and second positions as said first body moves between open and close positions thereof;
• and
• resilient member secured at one end thereof to said link-arm member for biasing said link-arm member to move toward said first position thereof so that said first body is biased to move toward the open position thereof, said resilient member being arranged to be linearly stretched and/or contracted upon movement of said link-arm member,
• wherein an abutting portion is formed on said link-arm member that abuts and bends said resilient member when said first body is in the vicinity of said second body, and a relative positional relationship between said one end and said other end of said link-arm member is fixed when said first body moves.