Patent US4236495A successfully refreshed from Google Patents.
US4236495A
Expired / Lapsed
US
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Self locking valve seat insert
Assignee: Fairchild Industries Inc
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Filing: 1978-10-13
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Granted: 1980-12-02
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Expires: 1998-10-13
Abstract
Abstract A valve seat insert for installation in cylinder heads of internal combustion engines which includes a pilot flange, an annular groove and a serrated locking flange by which the valve seat insert is locked into the cylinder head.
Inventors
- 👤 Jose Rosan, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:43
CPC Classifications
F; F01; F01L; F01L3/00; F01L3/22; F02; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49298; Y10T29/49306
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
108 words
A cylinder head and valve seat insert in combination comprising; a cylinder head of material softer than the valve seat insert; a valve seat insert for installation therein which includes a pilot flange, a locking flange means containing a cutting edge on its lower face and the valve seat means on its upper face, the circumference of said locking flange containing longitudinal serration means; an annular groove formed below said locking flange by the cutting shoulder; a ring of metal composed of chips and metal cut from said cylinder head by the locking flange, tightly compressed into said annular groove locking the valve seat into the cylinder head.
Claim 2
Dependent Claim
108 words
A cylinder head and valve seat insert in combination comprising; a cylinder head of material softer than the valve seat insert; a valve seat insert for installation therein which includes a pilot flange, a locking flange means containing a cutting edge on its lower face and the valve seat means on its upper face, the circumference of said locking flange containing longitudinal serration means; an annular groove formed below said locking flange by the cutting shoulder; a ring of metal composed of chips and metal cut from said cylinder head by the locking flange, tightly compressed into said annular groove locking the valve seat into the cylinder head.
Claim 3
Dependent Claim
34 words
The self locking valve insert of claim 1 in which the diameter of said locking flange is not less than 0.005 greater nor more than 0.015 greater than the diameter of the pilot flange.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |