Patent US4474103A successfully refreshed from Google Patents.
US4474103A
Expired / Lapsed
US
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Brake boosters
Assignee: Whitnash PLC
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Filing: 1982-09-17
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Granted: 1984-10-02
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Expires: 2002-09-17
Abstract
Abstract A brake booster has a reaction ring interposed between the usual valve body and rubber reaction ring. The ring may have a plurality of legs each with a hooked end to engage and retain the piston head of the input rod.
Inventors
- 👤 Frederick A. W. Chamberlain
- 👤 David G. P. Morse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:21
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/46; B60T13/52; B60T13/573
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
126 words
A vacuum operated brake booster comprising: a housing; a movable wall having a bore therein positioned in said housing; an input member having a piston head thereon slidable in said bore; an output member having a piston head thereon slidable in said bore; an elastomeric disc between said piston heads; and a reaction ring of a resilient plastics material in said bore, said reaction ring comprising an annular portion having an end face for abutment with said elastomeric disc, said ring functioning to transmit direct axial loads between the movable wall and said elastomeric disc, and including at least three legs extending axially from said annular portion, each of said legs having a hook end engaged by a snap fit behind the input member piston head.
Claim 2
Dependent Claim
126 words
A vacuum operated brake booster comprising: a housing; a movable wall having a bore therein positioned in said housing; an input member having a piston head thereon slidable in said bore; an output member having a piston head thereon slidable in said bore; an elastomeric disc between said piston heads; and a reaction ring of a resilient plastics material in said bore, said reaction ring comprising an annular portion having an end face for abutment with said elastomeric disc, said ring functioning to transmit direct axial loads between the movable wall and said elastomeric disc, and including at least three legs extending axially from said annular portion, each of said legs having a hook end engaged by a snap fit behind the input member piston head.
Claim 3
Dependent Claim
30 words
A brake booster according to claim 1, wherein said legs abut a shoulder in said bore for transmission of direct axial loads between the movable wall and the elastomeric disc.
Claim 4
Dependent Claim
31 words
A brake booster according to claim 1, wherein the bore of said movable wall includes recesses and the ring includes angularly spaced radially outwardly directed projections which engage with said recesses.
Claim 5
Dependent Claim
16 words
A brake booster according to claim 3, wherein said projections are angularly aligned with the legs.
References Cited (Backward Citations)
GB937514A
Cited
GB964289A
Cited
US3548595A
Cited
US3559406A
Cited
GB1336870A
Cited
US4256016A
Cited
GB2034429A
Cited
GB2074270A
Cited
GB2085987A
Cited
GB2086504A
Cited
GB2084274A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |