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Patent US3858478A successfully refreshed from Google Patents.
US3858478A
Expired / Lapsed
US
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Concrete fastener
Assignee: Individual
•
Filing: 1972-08-24
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Granted: 1975-01-07
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Expires: 1992-08-24
Abstract
Abstract A fastener for driving into hard material such as concrete, stone, or brick includes a nail having a rounded head and an improved washer initially positioned about the shank of the nail at an end of the nail remote from the head. An impact tool having a nail driving attachment is used to drive the nail through the washer as the nail pierces the material.
Inventors
- 👤 Jr John J Boudreau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:31
CPC Classifications
F; F16; F16B; F16B15/00; Y; Y10; Y10S; Y10S411/00; Y10S411/923
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
154 words
A fastener for piercing a hard material by the use of an impacting member comprising; an elongated nail having a shank portion of constant diameter with a taper at one end and a head at the other end, and a flat washer disposed about the nail at the one end thereof, said washer having means defining a plurality of inwardly extending wings defining scoring means for preventing rotation of said nail, said head being rounded about its circumference and having a diameter of smaller dimension than the transverse extent of said washer, said head defining an outer diameter along a plane perpendicular to said shank and defining a first rounded edge of first radius and a second rounded edge of second radius in a second plane perpendicular to said first plane, said second radius being different than said first radius and the edges of said first and second radii meeting at said first plane.
Claim 2
Dependent Claim
154 words
A fastener for piercing a hard material by the use of an impacting member comprising; an elongated nail having a shank portion of constant diameter with a taper at one end and a head at the other end, and a flat washer disposed about the nail at the one end thereof, said washer having means defining a plurality of inwardly extending wings defining scoring means for preventing rotation of said nail, said head being rounded about its circumference and having a diameter of smaller dimension than the transverse extent of said washer, said head defining an outer diameter along a plane perpendicular to said shank and defining a first rounded edge of first radius and a second rounded edge of second radius in a second plane perpendicular to said first plane, said second radius being different than said first radius and the edges of said first and second radii meeting at said first plane.
Claim 3
Dependent Claim
25 words
A fastener as set forth in claim 1 wherein said washer has means defining four inwardly extending wings defining the inner diameter of said washer.
Claim 4
Dependent Claim
34 words
A fastener as set forth in claim 1 wherein said second radius is smaller than said first radius and is on a side of said head closest to said one end of said shank.
References Cited (Backward Citations)
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Cited
US2724116A
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US2761348A
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US2855817A
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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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |