US3882755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet metal drive fastener
Assignee: Illinois Tool Works Inc
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Filing: 1973-11-15
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Granted: 1975-05-13
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Expires: 1993-11-15
Abstract
Abstract A sheet metal drive fastener for penetrating roofing insulation and the like and puncturing sheet steel of other sheet metal decking and interlocking with the decking for securing the insulation thereto; and including an arcuate shank having a pointed end portion for puncturing an arcuate slot or aperture in the decking, and elongate wing-like arms trailing from the pointed end portion and initially diverging from the shank to be compressed upon passing through the punctured arcuate aperture in the decking against strong resistance into adjacency or contact with the edges of the shank and against lesser resistance in a compressive movement in a path generally radial to the imaginary center axis of the curved surface of the shank, and with the outer edges of the arms serrated to present barbs for locking engagement with the rear surface of the decking under the stored reactive spring force of the arms in their compressed condition.
Inventors
- 👤 Robert Victor Enstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:57
CPC Classifications
F; F16; F16B; F16B21/00; F16B21/06; F16B21/08; F16B21/086; F16B15/00; F16B15/04; F16B15/06; Y; Y10; Y10S; Y10S411/00; Y10S411/923
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
224 words
A one-piece fastener for piercing a sheet metal panel or the like and securing thereto an insulation sheet or the like; and comprising an arcuate shank portion with head means at one end thereof and with a piercing point portion having a substantially arcuate cross section located at the opposite end thereof; and a pair of planar wings diverging outwardly from the associated longitudinal side edges of the shank portion spacing the inner edges of the wings from the adjacent side edges of the shank portion for maximum resistance to movement of the wings in the planes thereof toward the adjacent edges of the shank portion when the fastener is driven to securing position, said wings diverging from the point portion toward and terminating short of the head means and having serrations along the outer edges thereof providing shoulders for locking engagement with a panel after piercing thereof by the point portion, said wings lying generally in planes which include the side edges of the shank and said planes being generally tangent to the imaginary surface of revolution which includes the arcuate shank, said penetrating point adapted to form an arcuate slot which tends to force the wings inwardly toward the side edges of the shank and generally wedge in the arcuate configuration of the slot when the fastener is driven to securing position.
Claim 2
Dependent Claim
224 words
A one-piece fastener for piercing a sheet metal panel or the like and securing thereto an insulation sheet or the like; and comprising an arcuate shank portion with head means at one end thereof and with a piercing point portion having a substantially arcuate cross section located at the opposite end thereof; and a pair of planar wings diverging outwardly from the associated longitudinal side edges of the shank portion spacing the inner edges of the wings from the adjacent side edges of the shank portion for maximum resistance to movement of the wings in the planes thereof toward the adjacent edges of the shank portion when the fastener is driven to securing position, said wings diverging from the point portion toward and terminating short of the head means and having serrations along the outer edges thereof providing shoulders for locking engagement with a panel after piercing thereof by the point portion, said wings lying generally in planes which include the side edges of the shank and said planes being generally tangent to the imaginary surface of revolution which includes the arcuate shank, said penetrating point adapted to form an arcuate slot which tends to force the wings inwardly toward the side edges of the shank and generally wedge in the arcuate configuration of the slot when the fastener is driven to securing position.
Claim 3
Dependent Claim
82 words
A fastener as claimed in claim 1, wherein the wings diverge from the center axis of the arcuate shank portion to positions from which the wings will be moved to attempt to follow the contour of the arcuate shank portion with the inner edges moving toward the adjacent edges of the shank portion against strong resistance while approaching the center axis of the shank portion and against lesser resistance in a direction generally radially of the imaginary axis of the arcuate contour.
Claim 4
Dependent Claim
20 words
A fastener as claimed in claim 1, wherein the head means comprises spaced lugs extending laterally of the shank portion.
Claim 5
Dependent Claim
45 words
A fastener as claimed in claim 3, wherein the shank portion includes A channel formation beginning adjacent the free ends of the wings, said channel formation comprising a pair of side walls and the included shank wall and from which walls the lugs respectively extend.
Claim 6
Dependent Claim
35 words
A plurality of collated fasteners of the type described in claim 3, wherein the lugs extending from the shank walls of one fastener extend into and are received by the channel of the adjacent fastener.
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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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |