Expansible chamber devices – Collapsible chamber wall portion – Wall portion formed of flexible material
Patent
1992-02-25
1993-10-05
Look, Edward K.
Expansible chamber devices
Collapsible chamber wall portion
Wall portion formed of flexible material
92 99, 92104, 92105, F16J 302
Patent
active
052495086
ABSTRACT:
An actuator (1) of a diaphragm type which comprises an actuator case (2,3), a diaphragm (5) housed in the actuator case, a diaphragm plate (4) attached to the diaphragm for moving together with the diaphragm according to introduction of negative or atmospheric pressure into a negative pressure chamber (7) formed between the diaphragm and the actuator case (2) so as to actuate a device connected to the diaphragm plate. The diaphragm is formed with one or both of an annular rib (5e) having a thick-walled section and an annular expansive portion (5d) having a curved section. Therefore, the diaphragm is hard to be disengaged from the diaphragm plate even if an immoderate force is applied on the diaphragm.
REFERENCES:
patent: 4559864 (1985-12-01), Sakakibara et al.
patent: 4586427 (1986-05-01), Thiel
patent: 4729287 (1988-03-01), Boehm et al.
Hasegawa Jiro
Hishinuma Tadashi
Nakamura Ikuo
Jidosha Denki Kogyo Kabushiki Kaisha
Look Edward K.
Lopez F. Daniel
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