Patent ID: 8100389
Filing Date: 2012-01-24
Classification: F15B,F16F

Abstract:
1. A pneumatic actuator for use in a vibration damping device comprising: a base housing; an elastic wall member being fastened fluid-tightly to the base housing to form a working air chamber therebetween; and an urging member positioned within the working air chamber for exerting urging force on an output portion provided to the elastic wall member, such that the output portion is actuated to undergo displacement in opposition to the urging member through change in an air pressure in the working air chamber from an outside, wherein the base housing, on the working air chamber side thereof, has a plurality of rib portions which extend from an inner circumferential side thereof towards an outer circumferential side thereof, and an annular projecting portion, which continuously extends in a circumferential direction, is formed on the base housing, and the plurality of rib portions are formed so as to extend diametrically outward respectively from a plurality of locations on a circumference of the annular projecting portion.