| 摘要 |
PURPOSE:To contrive to simplify the structure of a device by fastening a piston boss connecting mutually the respective inner circumferential beads of a front and a rear diaphragm monolithically with a connecting cylinder and a keep plate which are put upon the front and rear sections of said boss by the use of through bolts, and constituting thereby said inner circumferential beads to be held. CONSTITUTION:A piston boss 10 is pivotally mounted within the subject booster in such a way as to be freely slidable to a bulkhead 1c partitioning the inside of a booster shell 1 into a front and a rear shell chamber 2 and 3. And a front and a rear diaphragm 5 and 7 partitioning each shell chamber 2 and 3 into negative pressure chambers 2a and 3a and working chambers 2b and 3b are connected with the aforesaid boss 10. In this case, the piston boss 10 is connected with both the end wall plate 13a of a connecting cylinder 13 connected with a front booster piston 4 and a keep plate 14 put upon the rear end section of the boss by the use of bolts 15.... And then, the inner circumferential bead 5a of the front diaphragm 5, and the inner circumferential bead 7a of the rear diaphragm 7 are held between the front booster piston 4 and the boss 10 and between a rear booster piston 6 and the keep plate respectively. |
