Patent US3894467A successfully refreshed from Google Patents.
US3894467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansion nail
Assignee: Individual
•
Filing: 1974-03-13
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Granted: 1975-07-15
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Expires: 1994-03-13
Abstract
Abstract There is disclosed an expansion nail designed for driving into and through wallboard and having a substantial load bearing capability. The shank or stem of the nail comprises crosswise holes therethrough, into which anchor members of generally Ushaped configuration and made of a length of springy wire or strip are fitted. The arms of each member are so disposed and biased that they define when relaxed an acute angle relative to the lengthwise axis of the nail and face toward the head of the nail. A casing or sleeve is slidably fitted upon the nail so that it holds the arms flat against the nail. The sleeve is lengthwise slit to form two or more separate parts which are initially joined by a suitable frangible material such as glue or score lines. When such expansion nail is driven into and through wallboard the jolts caused by the hammer blows will break the joints between the sleeve parts and upon driving the nail into a position in which the sleeve has completely penetrated the wallboard, the biased arms will snap open and thus abut against the inside of the wallboard thereby effectively preventing a pulling or falling out of the nail.
Inventors
- 👤 Carl Brescia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:30
CPC Classifications
F; F16; F16B; F16B15/00; F16B15/04; Y; Y10; Y10S; Y10S411/00; Y10S411/922
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
267 words
A wall board expansion nail for driving through wall board from one side thereof and into space on the other side of the wall board, said nail comprising: an elongate nail-like stem member having a pointed end and a head end, said stem member having a length greater than the thickness of wall board through which it is to be driven; a passageway extending transversely through a portion of said stem member adjacent to the pointed end thereof; a springy anchor member extended through the passageway, said anchor member having arms extending beyond the passageway in the direction toward said head end and being biased to define, when relaxed, an acute angle with the axis of said stem member; an open-ended sleeve circumferentially covering at least a portion of said stem member and the arms of said anchor member, the inner peripheral outline of said sleeve being such that the arms are held flat to the outside of the stem member, against the bias applied to said arms and the length and location of said sleeve being such that it is fully outside of the wall board when the stem member is driven through the same and protrudes into the space on the other side of the wall board; said sleeve being separable into at least two axially extending parts; and shock-sensitive joining means frangibly joining said parts, joining means being fractured by blows applied to said head end when and while the stem member is driven through the wall board and into said space thereby causing separation of said parts and spreading of the anchor members.
Claim 2
Dependent Claim
267 words
A wall board expansion nail for driving through wall board from one side thereof and into space on the other side of the wall board, said nail comprising: an elongate nail-like stem member having a pointed end and a head end, said stem member having a length greater than the thickness of wall board through which it is to be driven; a passageway extending transversely through a portion of said stem member adjacent to the pointed end thereof; a springy anchor member extended through the passageway, said anchor member having arms extending beyond the passageway in the direction toward said head end and being biased to define, when relaxed, an acute angle with the axis of said stem member; an open-ended sleeve circumferentially covering at least a portion of said stem member and the arms of said anchor member, the inner peripheral outline of said sleeve being such that the arms are held flat to the outside of the stem member, against the bias applied to said arms and the length and location of said sleeve being such that it is fully outside of the wall board when the stem member is driven through the same and protrudes into the space on the other side of the wall board; said sleeve being separable into at least two axially extending parts; and shock-sensitive joining means frangibly joining said parts, joining means being fractured by blows applied to said head end when and while the stem member is driven through the wall board and into said space thereby causing separation of said parts and spreading of the anchor members.
Claim 3
Dependent Claim
21 words
The nail of claim 1 wherein said sleeve is provided with axially extending grooves which define said axially extending sleeve parts.
Claim 4
Dependent Claim
61 words
The nail of claim 1 wherein said passageway is a straight bore crosswise of said stem member, and wherein said anchor member comprises a straight base portion fitted in said bore and two arms each extending from the end of said straight base portion and being biased to occupy said acute angle relative to the lengthwise axis of the stem member.
Claim 5
Dependent Claim
32 words
The nail according to claim 1 wherein at least a second passageway and an anchor member inserted into said passageway are provided, said second passageway being axially spaced from the other passageway.
Claim 6
Dependent Claim
13 words
The nail of claim 1 wherein said joining means comprise a brittle adhesive.
Claim 7
Dependent Claim
53 words
The nail of claim 1 wherein said pointed end of the stem member is generally conically shaped and the sleeve at its end adjacent to said pointed end terminates in a matchingly tapered portion partly encompassing said conical end, the tip of the pointed stem member end protruding from the tapered sleeve end.
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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) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |