Patent US4712959A successfully refreshed from Google Patents.
US4712959A
Expired / Lapsed
US
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Washer with resilient head cripping means
Assignee: Illinois Tool Works Inc
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Filing: 1987-03-30
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Granted: 1987-12-15
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Expires: 2007-03-30
Abstract
Abstract A washer for attaching insulation to a roof member over which roofing membrane is to be placed. The washer includes a laterally extending apertured flange and an upstanding hollow cylindrical protrusion adapted to snappingly engage the head of a fastener used with the washer. The protrusion has an inwardly extending lip on the inside surface of the free end of the protrusion. A resilient rib is disposed between the protrusion and the aperture in the washer. The rib resiliently urges the head of the fastener into engagement with the lip. The washer includes a downwardly extending hub, which may be equipped with means for retaining the washer in a batten strip.
Inventors
- 👤 Riaz Hasan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:36
CPC Classifications
F; F16; F16B; F16B43/00; F16B43/001; E; E04; E04D; E04D3/00; E04D3/36; E04D3/3601; E04D3/3603
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
109 words
A washer for use in attaching insulation to a roof member with a fastener having a head and an elongated shank, said washer comprising a resilient non-metallic body having a central throughbore, a shoulder formed in said throughbore for engaging the head of a fastener, said shoulder defining and separating upper and lower portions of said throughbore, said upper portion having a maximum lateral dimension greater than that of said lower portion, restraining means formed in said upper portion of said throughbore for engaging a portion of said fastener head, resilient head pushing means formed on said shoulder for urging the fastener head into engagement with said restraining means.
Claim 2
Dependent Claim
109 words
A washer for use in attaching insulation to a roof member with a fastener having a head and an elongated shank, said washer comprising a resilient non-metallic body having a central throughbore, a shoulder formed in said throughbore for engaging the head of a fastener, said shoulder defining and separating upper and lower portions of said throughbore, said upper portion having a maximum lateral dimension greater than that of said lower portion, restraining means formed in said upper portion of said throughbore for engaging a portion of said fastener head, resilient head pushing means formed on said shoulder for urging the fastener head into engagement with said restraining means.
Claim 3
Dependent Claim
27 words
A washer in accordance with claim 1 wherein said restraining means comprises a radially inwardly protruding annular lip adapted to snappingly engage the head of a fastener.
Claim 4
Dependent Claim
37 words
A washer in accordance with claim 1 wherein said pushing means is an axially extending generally annular rib having a V-shaped cross-section tapering from a wider base portion integrally formed with said shoulder to a narrower crest.
Claim 5
Dependent Claim
30 words
A washer in accordance with claim 1 wherein said body has a central hub depending from one side of said washer and a flange in snapped engagement with said hub.
References Cited (Backward Citations)
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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 |