Vibration-preventing rubber device

Claim 1

A vibration-preventing device comprising: an inner cylinder; an upper plate; a lower plate; a partition wall positioned outside said inner cylinder and interposed between said upper plate and said lower plate, said upper plate and said lower plate being connected to said inner cylinder; an upper vibration-preventing rubber member interposed between said partition wall and said upper plate; an upper elastic film disposed between said upper vibration-preventing member and said inner cylinder; an upper damper liquid chamber being defined by said upper vibration-preventing rubber member, said partition wall and said upper elastic film; a lower vibration-preventing rubber member interposed between the partition wall and the lower plate; a lower elastic film disposed between said upper vibration-preventing members and said inner cylinder; a lower damper liquid chamber being defined between said partition wall, said lower elastic film and said lower vibration-preventing rubber member; and a first orifice, said upper damper liquid chamber communicating with said lower damper liquid chamber through said first orifice, at least one of said upper damper liquid chamber and said lower damper liquid chamber being horizontally divided into a plurality of damper liquid subchambers by rubber division plates, said division plates being integral with one of said vibration-preventing rubber member and connected with at least one of said upper and lower elastic films, adjacent ones of said damper liquid subchambers communicating directly with each other through additional orifices horizontally located in said each division plate.