US4712802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing washers for headed fasteners
Assignee: ITW Ltd
•
Filing: 1986-03-27
•
Granted: 1987-12-15
•
Expires: 2006-03-27
Abstract
Abstract A sealing washer comprising an apertured metal backing member, a sealing member of resilient material abutting one face of the backing member forming a laminate therewith, and a shoulder of resilient material abutting the opposite face of the backing member and integral with the sealing member by a connecting portion extending axially through the aperture whereby, in use, a headed fastener may be assembled to the sealing washer with a shank of the fastener extending through the aperture, characterized in that, when considered in any plane including the axis of the aperture, the backing member includes an outer rimmed portion, an intermediate domed portion whose concave surface contacts the sealing member, and an inner depressed portion having first and second parts, the first part of the depressed portion extending more perpendicularly than the second part to the axis of the aperture for assisting in resisting axial spread of the shoulder during use of the sealing washer, and the second part of the depressed portion extending less perpendicularly than the first part to the axis of the aperture for assisting in resisting transverse spread of the shoulder during use of the sealing washer.
Inventors
- 👤 George D. Hewison
- 👤 Terence E. Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:38
CPC Classifications
F; F16; F16B; F16B43/00; F16B43/001; F16J; F16J15/00; F16J15/02; F16J15/021; F16J15/022; F16J15/024; F16J15/025
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
211 words
A sealing washer comprising an apertured metal backing member, a sealing member of resilient material abutting one face of the backing member forming a laminate therewith, and a shoulder of resilient material abutting the opposite face of the backing member and integral with the sealing member by a connecting portion extending axially through the aperture whereby, in use, a headed fastener may be assembled to the sealing washer with a shank of the fastener extending through the aperture, characterized in that, when considered in any plane including the axis of the aperture, the backing member includes an outer rimmed portion, an intermediate domed portion whose concave surface contacts the sealing member, and an inner depressed portion having first and second parts, the first part of the depressed portion extending more perpendicularly than the second part to the axis of the aperture for assisting in resisting tranverse spread of the shoulder during use of the sealing washer and indicator means in the form of an outer rib is provided on that face of the sealing member for pressing against a workpiece whereby, during use of the sealing washer, the outer rib is urged outwardly to become at least equal in diameter to the rimmed portion when a correct load setting is achieved.
Claim 2
Dependent Claim
211 words
A sealing washer comprising an apertured metal backing member, a sealing member of resilient material abutting one face of the backing member forming a laminate therewith, and a shoulder of resilient material abutting the opposite face of the backing member and integral with the sealing member by a connecting portion extending axially through the aperture whereby, in use, a headed fastener may be assembled to the sealing washer with a shank of the fastener extending through the aperture, characterized in that, when considered in any plane including the axis of the aperture, the backing member includes an outer rimmed portion, an intermediate domed portion whose concave surface contacts the sealing member, and an inner depressed portion having first and second parts, the first part of the depressed portion extending more perpendicularly than the second part to the axis of the aperture for assisting in resisting tranverse spread of the shoulder during use of the sealing washer and indicator means in the form of an outer rib is provided on that face of the sealing member for pressing against a workpiece whereby, during use of the sealing washer, the outer rib is urged outwardly to become at least equal in diameter to the rimmed portion when a correct load setting is achieved.
Claim 3
Dependent Claim
18 words
A sealing washer according to claim 1, characterised in that the domed portion is of substantially elliptical profile.
Claim 4
Dependent Claim
26 words
A sealing washer according to claim 1, characterised in that the first part of the depressed portion extends substantially perpendicularly to the axis of the aperture.
Claim 5
Dependent Claim
63 words
A sealing washer according to claim 1, characterised in that the second part of the depressed portion extends between an inner end of the domed portion and an outer end of the first part of the depressed portion, the inner end of the domed portion being the highest part of the domed portion considered in the direction of the axis of the aperture.
Claim 6
Dependent Claim
29 words
A sealing washer according to claim 1, characterised in that the shoulder of the resilient material abuts both the first part and the second part of the depressed portion.
Claim 7
Dependent Claim
40 words
A sealing washer according to claim 1, characterised in that the shoulder of the resilient material extends out of the depressed portion, beyond the highest part of the domed portion considered in the direction of the axis of the aperture.
Claim 8
Dependent Claim
22 words
A sealing washer according to claim 1, characterised in that the rimmed portion extends generally parallel to the axis of the aperture.
Claim 9
Dependent Claim
22 words
A sealing washer according to claim 1, characterised in that the rimmed portion extends generally perpendicular to the axis of the aperture.
Claim 10
Dependent Claim
55 words
A sealing washer according to claim 1, characterised in that engagement means in the form of an inner rib is provided on that face of the sealing member for pressing against a workpiece whereby, during use of the sealing washer, the inner rib is urged inwardly into sealing engagement with the shank of the fastener.
References Cited (Backward Citations)
US2982573A
Cited
US3606357A
Cited
DE1934799A1
Cited
US3519279A
Cited
US3661046A
Cited
GB1553295A
Cited
US4280390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |