Patent ID: 7114710

Claim:
A pneumatic vibration isolator comprising: a housing having an upper and a lower part, a first cylindrical side wall attached to the upper part, a second cylindrical side wall attached to the lower part, said first cylindrical side wall and said second cylindrical side wall defining an annular gap therebetween, a pneumatic line system, a spring pneumatic mechanism disposed in said annular gap for counteracting radially directed relative movements between the upper part and the lower part, said pneumatic spring mechanism includes four pneumatic chambers, an upper plate extending substantially in a radial direction and connected to the first side wall; a lower plate extending substantially in a radial direction and connected to the second side wall; a support disposed between the upper and lower plates for acting in an axial direction between said upper and lower parts and allowing relative movements in a radial direction between the upper part and the lower part; wherein the support is a bearing which includes an upper bearing body supporting the upper plate of the upper part, and a lower bearing body separated from the upper bearing body and attached to the lower plate, and wherein the spring mechanism is a pneumatic spring connected to said pneumatic line system, wherein the pneumatic chambers each are surrounded by a flexible fluid tight sleeve and circumferentially arranged in symmetrical disposition in the annular gap between the first and second cylindrical side wall and connected to the pneumatic line system, said pneumatic line system includes two adjustable throttle valves and two of each of the four pneumatic chambers are located in diametrically opposing position and are each pneumatically connected with each other through a respective one of said adjustable throttle valves.