US3710672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow sheet metal nail
Assignee: Individual
•
Filing: 1971-05-25
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Granted: 1973-01-16
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Expires: 1991-05-25
Abstract
Abstract A sheet metal nail has a head and two channel shaped legs connected at one end to the head portion and terminating in penetrating ends. The legs have longitudinally straight parallel outer sides and a curved intermediate side portion with the straight sides of one received substantially their full width within the straight sides of the other, and with the opposed curved sides being separated at their head end and at their penetrating end substantially the same distance apart and in which the curved intermediate side of each leg is curved inwardly. When this nail is driven into a poured aggregate, no void is left near the penetrated surface of the aggregate which there would be if the legs were closer together at the head end than at their penetrating end, thereby eliminating an initial yield as well as offering greater resistance to the withdrawal of the nail.
Inventors
- 👤 R Hallock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:24
CPC Classifications
E; E04; E04D; E04D5/00; E04D5/14; E04D5/144; E04D5/145; F; F16; F16B; F16B15/00; F16B15/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
155 words
A nail for attaching covering material to a building material, said nail comprising a head and a shank, the shank having a penetrating end, said shank including at least two legs flexibly joined at one end to said head and free to move apart along their length, at least one of the legs being substantially channel-shaped in transverse cross-section, said legs being in overlapping relationship and defining a hollow enclosure prior to being driven, at least a portion of said enclosure intermediate the ends thereof having a cross-sectional area less than the cross-sectional area at said one end, said portion including means to cause at least portions of said legs to spread apart when driven into engagement with said building material while other portions of said legs remain in overlapping relationship, whereby a plug of material is retained between the legs which maintains them in spread position in order to increase the resistance to withdrawal.
Claim 2
Dependent Claim
155 words
A nail for attaching covering material to a building material, said nail comprising a head and a shank, the shank having a penetrating end, said shank including at least two legs flexibly joined at one end to said head and free to move apart along their length, at least one of the legs being substantially channel-shaped in transverse cross-section, said legs being in overlapping relationship and defining a hollow enclosure prior to being driven, at least a portion of said enclosure intermediate the ends thereof having a cross-sectional area less than the cross-sectional area at said one end, said portion including means to cause at least portions of said legs to spread apart when driven into engagement with said building material while other portions of said legs remain in overlapping relationship, whereby a plug of material is retained between the legs which maintains them in spread position in order to increase the resistance to withdrawal.
Claim 3
Dependent Claim
25 words
The invention as defined in claim 1 in which each of said legs is generally U-shaped in cross-section and said legs are substantially oppositely disposed.
Claim 4
Dependent Claim
43 words
The invention as defined in claim 1 in which each leg has three sides, two of which are straight and joined together by the third side, at least a portion of the third side being inclined inwardly toward the centerline of the nail.
Claim 5
Dependent Claim
22 words
The invention as defined in claim 1 in which the intermediate oppositely facing portions of each of the legs is curved inwardly.
Claim 6
Dependent Claim
43 words
The invention as defined in claim 2 in which the cross-sectional area of the shank adjacent to the head and adjacent to the penetrating end are substantially of equal size and in which the cross-sectional area intermediate the ends is of reduced size.
Claim 7
Dependent Claim
31 words
The invention as defined in claim 5 in which each leg has multiple sides, a portion of at least one side of each leg overlapping a side of an adjacent leg.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |