Power plants – Pressure fluid source and motor – Pulsator
Reexamination Certificate
2005-08-30
2005-08-30
Look, Edward K. (Department: 3745)
Power plants
Pressure fluid source and motor
Pulsator
Reexamination Certificate
active
06935112
ABSTRACT:
A master cylinder comprises a cylinder body in a cylindrical form having one end closed and including a discharge passage and a supply passage for a brake fluid, the supply passage being communicated with a reservoir. A piston is slidably disposed in the cylinder body, so as to form a pressure chamber for supplying a fluid pressure to the discharge passage. A piston seal is provided in a circumferential groove formed in the cylinder body, which has an inner circumferential surface thereof in slidable contact with the piston and is capable of sealingly disconnecting the supply passage and the pressure chamber. The cylinder body includes a communication groove which opens into the circumferential groove and extends from the circumferential groove toward the closed end of the cylinder body to thereby connect the circumferential groove and the discharge passage. The communication groove is formed outwardly beyond a bottom surface of the circumferential groove relative to a radial direction of the cylinder body.
REFERENCES:
patent: 4524585 (1985-06-01), Coll et al.
patent: 4945729 (1990-08-01), Hayashida et al.
patent: 6694732 (2004-02-01), Tsubouchi
patent: 6848257 (2005-02-01), Bacardit et al.
Amari Yasuhiko
Iwai Yoshinari
Koshimizu Naganori
Mouri Tomonori
Kabushiki Kaisha Hitachi Seisakusho
Leslie Michael
Look Edward K.
Wenderoth , Lind & Ponack, L.L.P.
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