Sight and dust cap thereof

Abstract

A sight includes an objective barrel and a dust cap connected to the objective barrel. The dust cap includes a main body, a cover, a first flexible element, and a second flexible element, The cover is connected to the main body. The first flexible element is connected to the main body and includes an inner surface. The second flexible element is disposed in the first flexible element and includes an outer surface wherein the outer surface of the second flexible element contacts the inner surface of the first flexible element.

What is claimed is: 
     
         1 . A dust cap, comprising:
 a main body;   a cover connected to the main body;   a first flexible element, connected to the main body, comprising an inner surface; and   a second flexible element, disposed in the first flexible element, comprising an outer surface wherein the outer surface of the second flexible element contacts the inner surface of the first flexible element.   
     
     
         2 . The dust cap as claimed in  claim 1 , wherein the second flexible element further comprises a raised portion on the inner surface of the second flexible element. 
     
     
         3 . The dust cap as claimed in  claim 1 , wherein the second flexible element is circular arc shaped. 
     
     
         4 . The dust cap as claimed in  claim 1 , wherein the first flexible element is made of rubber or silica gel. 
     
     
         5 . The dust cap as claimed in  claim 1 , wherein the second flexible element is made of plastic. 
     
     
         6 . A sight, comprising:
 an objective barrel; and   a dust cap as claimed in  claim 1 , connected to the objective barrel,   
     
     
         7 . The sight as claimed in  claim 6 , wherein the second flexible element holds the objective barrel, and the first flexible element holds the objective barrel and the second flexible element. 
     
     
         8 . The sight as claimed in  claim 6 , wherein the objective barrel comprises a surface on which a groove is defined, the second flexible element further comprises a raised portion on the inner surface, and the raised portion is fitted in the groove. 
     
     
         9 . The sight as claimed in  claim 8 , wherein the groove is V-shaped, U-shaped, or rectangular. 
     
     
         10 . The sight as claimed in  claim 6 , wherein the second flexible element is made of plastic.