| 摘要 |
In a tandem type vacuum booster, the booster comprises a first and a second flange, and the second flange is formed with a first stop projection and a second stop projection, the first stop projection being adapted to abut against a predetermined one of the locking claw to stop the flanges at the assembled position before the locking claws interfere with a positioning means during rotation of the flanges to the assembled position, and the second stop projection permitting passing thereover of a locking claw other than the predetermined locking claw during rotation of the flanges toward the assembled position, but coming into abutment against such other locking claw to resist the rotation of the flanges back to the disassembled position when the flanges have reached the assembled position. This ensures that the positioning means for the flanges of the partition wall plate and the rear shell half cannot be deformed during assembling of the booster, and this also makes it possible to stop the flanges at the predetermined assembled position. Further, even after assembling, the relative idle movement of the two shell halves can be prevented to maintain the flanges at the assembled position. |
