Expansible chamber devices – Plural flexible wall working members
Reexamination Certificate
1998-11-30
2001-01-09
Nguyen, Hoang (Department: 3748)
Expansible chamber devices
Plural flexible wall working members
C091S37600A
Reexamination Certificate
active
06170385
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a brake booster or servomotor for use in the braking system of a motor vehicle.
BACKGROUND OF THE INVENTION
The use of a brake booster in the braking system of a motor vehicle is well known. The brake booster typically comprises a front and rear housing parts which are joined together around an outer peripheral edge; a flexible diaphragm secured inside the housing to define front and rear chambers within the housing; and a piston movable along its axis relative to the housing. At one or more positions within the booster, a cylindrical component of the booster has to pass though a seal during assembly of the booster; for example, the piston passing through an internally mounted seal, or an air passage tube extending through a sealing aperture in the diaphragm. In general, such a cylindrical component has an external diameter which is greater than the internal diameter of the seal prior to assembly. This can make installation of the cylindrical component through the seal difficult, especially where the assembler is unable to clearly see the installation during assembly (that is, during blind installation).
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a cylindrical component for a brake booster which is easier to install through a seal, especially during blind installation.
A brake booster in accordance with the present invention for the braking system of a motor vehicle comprises a housing; a diaphragm mounted within the housing to define front and rear chambers within the housing; and a cylindrical component mounted within the housing and having an end which passes through a sealing aperture during installation within the housing to make a seal with the cylindrical component; wherein the cylindrical component has a plurality of fingers extending away the said end, the fingers being circumferentially spaced apart around the end, and the outer surface of each finger being chamfered such that the free ends of each finger lie on a circle having an outer diameter which is less than the inner diameter of the sealing aperture prior to installation.
For the sake of clarity, by chamfered outer surfaces is meant that the outer surfaces of the fingers have a gradually reducing diameter from the said end of the cylindrical component to the free ends of the fingers. The chamfered outer surfaces may be flat or curved.
The presence of the fingers allows easier installation of the cylindrical component, especially where blind installation is required.
REFERENCES:
patent: 4377966 (1983-03-01), Parker et al.
patent: 5261312 (1993-11-01), Bornemann et al.
patent: 5878650 (1999-03-01), Osterday et al.
patent: 2918911 (1980-12-01), None
patent: 3114235 (1982-06-01), None
patent: 4116779 (1992-11-01), None
patent: 0233026 (1987-08-01), None
patent: 823722 (1959-11-01), None
patent: 1127626 (1965-09-01), None
patent: 1245126 (1968-08-01), None
Castel Philippe
Degorce Frederic C.
Lordier Daniel
Ombredane Raymond R.
Delphi Technologies Inc.
Nguyen Hoang
Sigler Robert M.
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