Patent ID: 6883680

Claim:
A lid opening device, comprising: a main body having an opening, a lid body for opening and closing the opening of the main body, a pivotal support part integrally formed on one end of the lid body and pivotally supported on the main body, an engaging member provided on a perimeter of the pivotal support part of the lid body, spring means attached to the main body for urging the engaging member of the lid body toward an opening direction thereof, said spring means having a spring supported on the main body, and a swivel arm provided on the main body to swivel freely and urged by the spring, said swivel arm having one end contacting the engaging member of the lid body and being urged by the spring toward the opening direction of the lid, locking means formed between the lid body and the main body for holding the lid body in a closed position against an urging force of the spring means, and engaging range restricting means formed on the main body for restricting a range of engagement between the spring means and the engaging member of the pivotal support part so that the lid body is opened by the urging force of the spring means to a predetermined initial opening position.