Patent ID: 9303772
Filing Date: 2016-04-05
CPC Classification: B60T,F16K,G05D,Y10T

Claim Text:
1. A diaphragm device comprising: a supporting member; a flexible membrane that is supported at a first side thereof by a membrane supporting portion of the supporting member; and a housing that accommodates the flexible membrane and the supporting member, and wherein the flexible membrane air-tightly separates a first chamber and a second chamber connected to the outside through a through-hole formed in the membrane supporting portion of the supporting member, inside the housing, wherein an avoidance recessed portion to avoid interference with an opening edge of the through-hole is formed at a position of the flexible membrane corresponding to the through-hole, wherein the avoidance recessed portion is provided at a thick portion thicker than the other portion of the flexible membrane, and the thick portion protrudes from the other portion of the flexible membrane toward the first chamber, wherein a movable plate is provided at a second side of the flexible membrane opposite the first side, the movable plate being pressed by the flexible membrane, wherein the supporting member is slidably accommodated in a cylinder provided in the housing, wherein a spring is provided on the membrane supporting portion at a side opposite to the flexible membrane, and wherein the flexible membrane and the supporting member are biased by the spring toward the first chamber.