US3783734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clamp load indicating and sealing fastener assembly
Assignee: Federal Screw Works
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Filing: 1972-08-28
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Granted: 1974-01-08
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Expires: 1992-08-28
Abstract
Abstract A fastener assembly in which a plastic member is snap fitted on a threaded metallic fastener. As the fastener is tightened the plastic is extruded into the fastened joint. When the clamp load reaches a predetermined value, the plastic is severed by the fastener, causing the outer peripheral portion of the plastic to fall off the fastener. This gives a visible signal that the desired clamp load has been reached.
Inventors
- 👤 A Velthoven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:34
CPC Classifications
F; F16; F16B; F16B43/00; F16B43/001; F16B31/00; F16B31/02; F16B31/028
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
144 words
A fastener assembly including a hard metallic fastener body having a thread and a radially outwardly projecting annular flange provided with a seat adjacent the outer periphery of said body and an extrudable resinous plastic member having an annular washer portion in confronting relation to said seat and a retainer portion fitted over said flange to hold said member on said body with said washer portion adjacent said seat, said member having a plurality of circumferential discontinuities extending radially inwardly from its outer periphery into axial alignment with said seat, said discontinuities terminating short of the inner periphery of said member, said seat being operable to extrude and sever said washer portion upon the tightening of the fastener assembly, whereby the portion of said member radially outwardly of said seat will be divided into a plurality of segments which readily separate from said fastener.
Claim 2
Dependent Claim
144 words
A fastener assembly including a hard metallic fastener body having a thread and a radially outwardly projecting annular flange provided with a seat adjacent the outer periphery of said body and an extrudable resinous plastic member having an annular washer portion in confronting relation to said seat and a retainer portion fitted over said flange to hold said member on said body with said washer portion adjacent said seat, said member having a plurality of circumferential discontinuities extending radially inwardly from its outer periphery into axial alignment with said seat, said discontinuities terminating short of the inner periphery of said member, said seat being operable to extrude and sever said washer portion upon the tightening of the fastener assembly, whereby the portion of said member radially outwardly of said seat will be divided into a plurality of segments which readily separate from said fastener.
Claim 3
Dependent Claim
15 words
The structure set forth in claim 1 in which said discontinuities comprise relatively thin slits.
Claim 4
Dependent Claim
24 words
The structure set forth in claim 1 in which said retainer portion comprises a discontinuous collar extending upwardly and inwardly from said sealing portion.
Claim 5
Dependent Claim
24 words
The structure set forth in claim 1 in which said fastener body is provided with an annular recess between said seat and said thread.
Claim 6
Dependent Claim
14 words
The structure set forth in claim 1 in which said fastener comprises a nut.
Claim 7
Dependent Claim
14 words
The structure set forth in claim 1 in which said fastener comprises a screw.
Claim 8
Dependent Claim
15 words
The structure set forth in claim 1 in which said member is made from polyethylene.
References Cited (Backward Citations)
US1505508A
Cited
US2273772A
Cited
US3144803A
Cited
US3285120A
Cited
US3469492A
Cited
US3622167A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |