Power plants – Pressure fluid source and motor – Pulsator
Reexamination Certificate
2005-12-27
2005-12-27
Look, Edward K. (Department: 3745)
Power plants
Pressure fluid source and motor
Pulsator
Reexamination Certificate
active
06978614
ABSTRACT:
This invention relates to a master cylinder (10), inside a bore (14) of which two axial primary and secondary pistons (16, 18), are slidingly fitted, and in which at least one sealing means (48, 50) is disposed in contact with each piston, defining a supply chamber (56, 60) and a pressure chamber (58, 62). Each piston (16, 18) comprises a bore (78, 80), open in the direction of the front pressure chamber (58, 62), and the piston (18) comprises a valve-forming through-hole (88), opening into its periphery and into its bore (80), in order to isolate the front pressure chamber when it passes beyond the sealing means so as to produce a braking pressure, characterised in that the front pressure chamber (62) associated with at least one piston (18) comprises at least one tubular cylindrical element (90) extending axially outside the piston (18) and rearwards of the sealing means (50) for the obturation of the through-hole (88) according to a reduced stroke (Cm2).
REFERENCES:
patent: 4685300 (1987-08-01), Steer
patent: 4989498 (1991-02-01), Mori et al.
patent: 5063743 (1991-11-01), Mori et al.
patent: 5187934 (1993-02-01), Mori
Bourlon Philippe
Lebret Pierre
Comstock Warren
Leslie Michael
Look Edward K.
McCormick Jr. Leo H
Robert & Bosch GmbH
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