Master cylinder

Details Master cylinder Master cylinder

2006-03-21

2006-03-21

Lazo, Thomas E. (Department: 3745)

Power plants

Pressure fluid source and motor

Pulsator

C060S562000

Reexamination Certificate

active

07013643

ABSTRACT:
A master cylinder includes a cylinder body and a piston slidably inserted in the cylinder while kept in slide contact with two cup members both fitted in the inner surface of the cylinder body to seal the gap between the piston and the inner surface of the cylinder body. On its radially inner surface, the cylinder body is formed with first to third piston guide portions. Each piston guide portion is formed with an odd number of grooves arranged at circumferentially equal distances. Each groove of each piston guide portion axially aligns with the corresponding grooves of the other piston guide portions. The circle including the bottoms of the grooves of the first guide portion has a diameter equal to or smaller than the rear opening of the cylinder body. The grooves of the first guide portion have a width gradually decreasing toward the front end thereof.

REFERENCES:
patent: 4524585 (1985-06-01), Coll et al.
patent: 5617725 (1997-04-01), Yasuda
patent: 6463737 (2002-10-01), Inoue et al.
patent: 2 820 387 (2002-08-01), None

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