Clasp for jewelry chain

Abstract

The present discloses a clasp for jewelry chain, which comprises a housing combined by a first cover body and a second, a chain placing portion, chain length adjusting portions, and securing and adjusting structure that is specially designed for securing the jewelry chain and adjusting the length of the jewelry chain randomly in the clasp. After the chain is arranged in the chain placing portion and traverses through the chain length adjusting portions, the chain can be secured by the clasp and the length and tightness of the chain can be adjusted under the action of an external force. The structure of the clasp of jewelry chain of the present invention breaks through a conventional technology, which can satisfy various demands of different consumers.

What is claimed is: 
     
         1 . A clasp for jewelry chain comprising:
 a housing combined by a first cover body and a second cover body in a manner that can be opened and closed;   a chain placing portion arranged on the first cover body to place one end of the chain;   chain length adjusting portions arranged on the first cover body and the second cover body of the housing respectively to make the chain pass through the housing for placement, so as to adjust the length of the chain under the action of an external force;   a first securing member for the first adjusting member arranged in the first cover body;   a first adjusting member arranged in the first securing member for the first adjusting member;   a second securing member for the second adjusting member arranged in the second cover body; and   a second adjusting member arranged in the second securing member for the second adjusting member and matched with the first securing member for the first adjusting member;   wherein after the chain is arranged in the chain placing portion and traverses through the chain length adjusting portions, the first adjusting member and the second adjusting member are matched with each other to secure the chain and adjust the length and tightness of the chain under the action of an external force.   
     
     
         2 . The clasp in accordance with  claim 1 , wherein the clasp is provided with a strut rod, and one end of the first cover body and the second cover body is provided with a through-hole to receive the strut rod, so as to allow that the first cover body and the second cover body is opened or closed. 
     
     
         3 . The clasp in accordance with  claim 1 , wherein the first adjusting member and the second adjusting member are elastic silicon sheets. 
     
     
         4 . The clasp in accordance with  claim 3 , wherein the first adjusting member is shaped as an arc, and one end of which is substantially shaped as an S. 
     
     
         5 . The clasp in accordance with  claim 1 , wherein the first securing member for the first adjusting member and the second securing member for the second adjusting member are made of silica gel. 
     
     
         6 . The clasp in accordance with  claim 3 , wherein the first adjusting member is a cantilever spring made of steel. 
     
     
         7 . The clasp in accordance with  claim 1 , wherein the first adjusting member and the second adjusting member are gears respectively, and the chain is provided with a concave-convex structure, so that the chain body can be locked by the gears. 
     
     
         8 . The clasp in accordance with  claim 1 , wherein the housing is made of metallic materials. 
     
     
         9 . The clasp in accordance with  claim 1 , wherein the chain length adjusting portions are arranged to be semi-circles mutually aligned on the first cover body and the second cover body, so as to form a through-hole after the first cover body and the second cover body are closed. 
     
     
         10 . The clasp in accordance with  claim 1 , wherein the chain placing portion is a hole arranged at one end of the second cover body.