Finger ring

Abstract

Arcuate pivotally movable members and an arcuate slidable member are assembled so that guide pins provided in the arcuate pivotally movable members are inserted into the guide groove formed in the arcuate slidable member. The arcuate pivotally movable members and the arcuate bearing member are assembled by pivotal pins so that the arcuate pivotally movable members can pivotally move around the pivotal pins in directions to enlarge an inner size of the finger ring. The arcuate bearing member has a leaf spring provided therein so that the leaf spring has one end pressed against an inner side of a projection projecting from a first end of one of the arcuate pivotally movable members and located ahead of the pivotal pin in the one arcuate pivotally movable member, and the leaf spring has the other end pressed against an inner side of a projection projecting from a first end of the other arcuate pivotally movable member and located ahead of the pivotal pin in the other arcuate pivotally movable member.

What is claimed is:  
     
         1 . A finger ring comprising: 
 a couple of arcuate pivotally movable members, each having a first end and a second end;    an arcuate bearing member provided to extend between the first ends of the arcuate pivotally movable members; and    an arcuate slidable member provided to extend between the second ends of the arcuate pivotally movable members; 
 wherein one of the couple and the arcuate slidable member has guide grooves formed therein to extend in a circumferential direction of the finger ring, the other has guide pins provided thereon, and the couple and the arcuate slidable member are assembled so that the guide pins are inserted into the guide grooves;  
 wherein the couple and the arcuate bearing member are assembled by pivotal pins so that the arcuate pivotally movable members can pivotally move around the pivotal pins in directions to enlarge an inner size of the finger ring;  
 wherein the arcuate bearing member has a leaf spring provided therein so that the leaf spring has one end pressed against an inner side of a projection projecting from the first end of one of the arcuate pivotally movable members and located ahead of the pivotal pin in the one arcuate pivotally movable member; and  
 wherein the leaf spring has the other end pressed against an inner side of a projection projecting from the first end of the other arcuate pivotally movable member and located ahead of the pivotal pin in the other arcuate pivotally movable member.  
   
     
     
         2 . The finger ring according to  claim 2 , wherein the projections of the arcuate pivotally movable members have outer surfaces in surface contact with an inner surface of the arcuate bearing member when the arcuate pivotally movable members are not pivotally moved in the directions to enlarge the inner size of the finger ring.