Patent ID: 7451888
Filing Date: 2008-11-18
Classification: B65D

Abstract:
1. A lid opening and closing apparatus, comprising: a base having an open portion, a lid having a rotational shaft and supported on the base to be rotatable around the rotating shaft for opening and closing the open portion, and connecting means for connecting the base and the lid having one spring disposed between the base and the lid, said one spring being stretched for urging the lid in a closed portion to an opening direction when the lid is pushed to a pushed-in position beyond the closed position, said one spring being stretched for urging the lid in an open position to a closing direction when the lid is closed to a predetermined angle, wherein said connecting means further comprises a first link arm having one end part with a support shaft rotatably supported on the base; a second link arm having one end part slidably attached to the first link arm and the other end part with a pin, said second link arm being urged in a direction approaching the first link arm by the one spring arranged between the first and second link arms; a push arm supported on the base for extending the second link arm further from the first link arm when the lid is pushed to the pushed-in position to thereby stretch the one spring; and a guide groove provided in the lid for guiding the pin, said guide groove moving the pin in a direction away from the first link arm when the lid is closed by the predetermined angle from the open position to thereby stretch the one spring.