Power plants – Pressure fluid source and motor – Pulsator
Reexamination Certificate
2005-10-18
2005-10-18
Lopez, F. Daniel (Department: 3745)
Power plants
Pressure fluid source and motor
Pulsator
Reexamination Certificate
active
06955047
ABSTRACT:
Disclosed is a master cylinder wherein a seal member is given plural seal functions to reduce the number of seal members for partitioning a drain portion of the master cylinder, a constant-pressure chamber of a booster and the atmosphere from one another, so that the master cylinder is simplified in construction and reduced in manufacturing cost. When a piston is operated by an output shaft of the booster attached to a booster mounting surface of a cylinder body, the operating fluid from the fluid pressure chamber partitioned by a fluid-tight seal member is supplied to a brake system. An annular complex seal member is fit in an internal seal stepped portion which is formed by radially expanding an opening portion of the cylinder which opens to a booster mounting surface. A slide seal portion of the complex seal member partitions a drain portion behind the fluid-tight seal member from the constant-pressure chamber of the booster through sliding contact with the piston. An air-tight seal portion of the complex seal member partitions the constant-pressure chamber from the atmosphere through abutting engagement with the front end surface of the booster. Further, a fixed seal portion of the complex seal member partitions the drain portion from the atmosphere through abutting engagement with the internal surface of an internal seal stepped portion.
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Mita Katsuhiro
Yasuda Atsushi
Advics Co., Ltd.
Burns Doane , Swecker, Mathis LLP
Lopez F. Daniel
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