Negative pressure booster equipment

Details Negative pressure booster equipment Negative pressure booster equipment

1991-01-11

1992-11-17

Hill, Mitchell J.

Expansible chamber devices

Collapsible chamber wall portion

Wall portion formed of flexible material

92 99, F16J 302

Patent

active

051633558

ABSTRACT:
According to the present invention, a rotation preventive portion for preventing the rotation of bead portion, such as a stepped projection, is provided on the bead portion of diaphragm, which is squeezed between a front shell and a rear shell. When the front shell and the rear shell are assembled with such a diaphragm, the rotation of the bead portion is prevented by this rotation preventive portion (stepped bead). As the result, outer lip of the bead portion of diaphragm or the rolling portion of diaphragm are not squeezed between the front shell and the rear shell, and the front shell and the rear shell can be assembled without damaging or breaking the diaphragm.

REFERENCES:
patent: 4495854 (1985-01-01), Hibino
patent: 4516474 (1985-05-01), Ochiai
patent: 4587889 (1986-05-01), Ohki et al.
patent: 4811653 (1989-03-01), Kobayashi et al.
patent: 4881451 (1989-11-01), Newhouse
patent: 5025709 (1991-06-01), Miyazaki

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