Lid opening and closing device

Abstract

A lid opening and closing device includes a first lock mechanism 5 for retaining a fully-closed position of lids 3 a, 3 b , a torsion coil spring 6 for accumulating an urging force in a direction so as to open the lids, and a release button 4 for unlocking the first lock mechanism. When the release button is pressed, the lids automatically open. The lid opening and closing device further includes a compression coil spring 9 for accumulating an urging force which allows the lids to move to a halfway position in a closing direction from a fully-open position, and a second lock mechanism 11 for retaining the compression coil spring in a compression position. When the release button is pressed at the fully-open position of the lids, the second lock mechanism is unlocked and the lids move to the halfway position in the closing direction. The urging force is accumulated in the torsion coil spring and the compression coil spring by manually moving the lids to the fully-closed position.

1 . A lid opening and closing device, comprising:
 a lock mechanism for retaining a fully-closed position of lids;   an urging-force accumulation member for accumulating an urging force in a direction so as to open the lid; and   an operating portion for unlocking said lock mechanism, said lid opening and closing device automatically opening said lids when the operating portion is unlocked,   wherein the lid opening and closing device further comprises a second urging-force accumulation member for accumulating an urging force for moving said lids to a halfway position in a closing direction from a fully-open position, and a second lock mechanism for retaining the second urging-force accumulation member in an urging-force accumulation position, and   when said operating portion is operated at the fully-open position of said lids, said second lock mechanism is unlocked and said lids move to the halfway position in the closing direction, and an urging force is accumulated in both of the urging-force accumulation members by moving the lids to the fully-closed position.   
   
   
       2 . A lid opening and closing device according to  claim 1 , further comprising:
 a first unlock mechanism for releasing the urging force of said urging-force accumulation member when said operating portion is operated at the fully-closed position of said lids;   a second unlock mechanism for releasing the urging force of said second urging-force accumulation member when said operating portion is operated at the fully-open position of said lids; and   an unlock-operation switching mechanism for selecting connection or disconnection between said first unlock mechanism and said second unlock mechanism.   
   
   
       3 . A lid opening and closing device according to  claim 1 , wherein said lids are double opening lids interconnected through a synchronous mechanism for performing synchronous movements. 
   
   
       4 . A lid opening and closing device according to  claim 1 , further comprising covers synchronizing with a movement of said lids in an opening direction and covering said lids in the fully-open position. 
   
   
       5 . A lid opening and closing device, comprising:
 a lock mechanism for retaining a fully-closed position of lid; and   an operating portion for unlocking the lock mechanism, said lid being opened when said operating portion is unlocked,   wherein the lid opening and closing device further comprises a cover for covering said lid in a fully-open position.   
   
   
       6 . A lid opening and closing device according to  claim 5 , wherein said cover synchronizes a movement of the lid in an opening direction.