Connection member, band and timepiece

Abstract

A connection member including a cylindrical member, a connection portion which is inserted into at least one end portion of the cylindrical member, and a spring member which is arranged in the cylindrical member and forces the connection portion toward outside of the cylindrical member, in which the spring member is formed of a corrosion-resisting material.

What is claimed is: 
     
         1 . A connection member comprising:
 a cylindrical member;   a connection portion which is inserted into at least one end portion of the cylindrical member; and   a spring member which is arranged in the cylindrical member and forces the connection portion toward outside of the cylindrical member,   wherein the spring member is formed of a corrosion-resisting material.   
     
     
         2 . The connection member according to  claim 1 , wherein the connection portion and the cylindrical member are equal in at least one of strength, proof stress, and hardness. 
     
     
         3 . The connection member according to  claim 1 , wherein the spring member is lower in at least one of tensile strength, proof stress, and hardness than the connection portion and the cylindrical member, or is lower in at least one of tensile strength, proof stress, and hardness than the connection portion and higher in at least one of tensile strength, proof stress, and hardness than the cylindrical member. 
     
     
         4 . The connection member according to  claim 1 , wherein the connection portion and the cylindrical member are equal in at least one of conductivity and degree of elongation. 
     
     
         5 . The connection member according to  claim 1 , wherein the spring member is higher in at least one of thermal conductivity and degree of elongation than the connection portion and the cylindrical member, or is lower in at least one of thermal conductivity and degree of elongation than the cylindrical member and higher in at least one of thermal conductivity and degree of elongation than the connection portion. 
     
     
         6 . The connection member according to  claim 1 , wherein the spring member is formed of a titanium alloy having a spring property. 
     
     
         7 . The connection member according to  claim 1 , wherein the spring member is formed of a titanium alloy whose crystal structure is a body-centered cubic structure. 
     
     
         8 . The connection member according to  claim 6 , wherein the spring member is formed of a titanium alloy whose crystal structure is a body-centered cubic structure. 
     
     
         9 . The connection member according to  claim 1 , wherein the connection portion is inserted into the one end portion of the cylindrical member. 
     
     
         10 . The connection member according to  claim 9 , wherein a connection projection portion is formed on an other end portion of the cylindrical member. 
     
     
         11 . The connection member according to  claim 10 , wherein a mark for distinguishing the connection projection portion is provided on the other end portion side of the cylindrical member. 
     
     
         12 . The connection member according to  claim 10 , wherein the cylindrical member provided with the connection projection portion and the connection portion are formed of a high-strength titanium alloy. 
     
     
         13 . The connection member according to  claim 11 , wherein the cylindrical member provided with the connection projection portion and the connection portion are formed of a high-strength titanium alloy. 
     
     
         14 . The connection member according to  claim 1 , wherein the connection portion is plurally inserted into both end portions of the cylindrical member. 
     
     
         15 . The connection member according to  claim 2 , wherein the connection portion is plurally inserted into both end portions of the cylindrical member. 
     
     
         16 . The connection member according to  claim 3 , wherein the connection portion is plurally inserted into both end portions of the cylindrical member. 
     
     
         17 . The connection member according to  claim 14 , wherein the cylindrical member is formed of titanium whose purity is high. 
     
     
         18 . The connection member according to  claim 15 , wherein the connection portion is formed of a high-strength titanium alloy. 
     
     
         19 . A band comprising the connection member according to  claim 1 . 
     
     
         20 . A timepiece comprising the band according to  claim 19 .