Power plants – Pressure fluid source and motor – Pulsator
Reexamination Certificate
2008-07-22
2008-07-22
Lopez, F. Daniel (Department: 3745)
Power plants
Pressure fluid source and motor
Pulsator
C277S441000
Reexamination Certificate
active
07401468
ABSTRACT:
A piston seal is provided in a circumferential groove formed in a cylinder body. The piston seal is capable of sealing a pressure chamber, which supplies fluid pressure to a discharge passage, from a supply passage, which communicates with a reservoir. The piston seal comprises: an annular base portion; an inner circumferential lip portion projecting from an inner circumferential side of the base portion and being in slidable contact with an outer circumferential surface of a piston; an outer circumferential lip portion projecting from an outer circumferential side of the base portion and being in abutment with the circumferential groove of the cylinder body; and an intermediate projecting portion which is formed between the inner circumferential lip portion and the outer circumferential lip portion of the base portion and which is projected beyond the outer circumferential lip portion. Cutout grooves are formed on a tip side of the intermediate projecting portion. Therefore, when releasing air, a sufficient amount of brake fluid can be supplied through a gap between the piston seal and a bottom surface of the circumferential groove, and the cutout groove. As a result, the number of repetitions of an air releasing operation can be minimized.
REFERENCES:
patent: 4524585 (1985-06-01), Coll et al.
patent: 6581380 (2003-06-01), Dangel et al.
patent: 2006/0091613 (2006-05-01), Drott et al.
patent: 2004-231093 (2004-08-01), None
Amari Yasuhiko
Kamase Daigoro
Koshimizu Naganori
Mouri Tomonori
Hitachi , Ltd.
Lopez F. Daniel
Wenderoth , Lind & Ponack, L.L.P.
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