US4452556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic headed fastener
Assignee: Illinois Tool Works Inc
•
Filing: 1980-10-06
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Granted: 1984-06-05
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Expires: 2000-10-06
Abstract
Abstract There is disclosed an improved fastener of the type having a head portion, a shank portion extending from the head portion, and a plastic cover overlying the fastener head. The head includes an outer perimeter of generally square configuration having a plurality of substantially straight side portions. The upper surface of the head is provided with an oversized drive recess which extends along the diagonals of the square perimeter. As a result, the fastener head may be readily aligned within a mold which forms the plastic head cover. More particularly, anyone of the straight side portions may engage an alignment surface of the mold to permit the final drive recess forming portion of the mold to be readily aligned with and received by the initial over sized drive recess. The resulting plastic cover entirely overlies the fastener head and the thickness of the plastic within the oversized recess reduces the drive recess dimension to a final desired size.
Inventors
- 👤 John F. Nelson
- 👤 Ernest H. Lindsay, Jr.
- 👤 Albert M. Zeller
- 👤 Francis C. Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:35
CPC Classifications
F; F16; F16B; F16B23/00; F16B23/0007; F16B23/0023; F16B37/00; F16B37/14; Y; Y10; Y10S; Y10S411/00; Y10S411/90; Y10S411/901; Y10S411/902; Y10S411/903
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
166 words
A fastener comprising: a metallic body including a head portion and a shank portion extending from said head portion, said head portion including an outer perimeter having a plurality of substantially straight side portions and an upper surface including a drive recess therein of a predetermined configuration, said recess being symmetrical with and disposed in a predetermined orientation with respect to each of said side portions; and non-metallic cover means substantially enclosing said head portion wherein said cover means generally is conformed to the configuration of said drive recess providing a generally constant thickness of nonmetallic material within said drive recess, whereby said straight side portions of said fastener facilitate proper orientation of said body in a mold preventing damage thereto and thereby insuring formation of generally constant thickness of said non-metallic material within said recess and whereby an interference fit between said cover means and said outer perimeter of said head portion provides for greater torque transmission from said cover means to said head portion.
Claim 2
Dependent Claim
166 words
A fastener comprising: a metallic body including a head portion and a shank portion extending from said head portion, said head portion including an outer perimeter having a plurality of substantially straight side portions and an upper surface including a drive recess therein of a predetermined configuration, said recess being symmetrical with and disposed in a predetermined orientation with respect to each of said side portions; and non-metallic cover means substantially enclosing said head portion wherein said cover means generally is conformed to the configuration of said drive recess providing a generally constant thickness of nonmetallic material within said drive recess, whereby said straight side portions of said fastener facilitate proper orientation of said body in a mold preventing damage thereto and thereby insuring formation of generally constant thickness of said non-metallic material within said recess and whereby an interference fit between said cover means and said outer perimeter of said head portion provides for greater torque transmission from said cover means to said head portion.
Claim 3
Dependent Claim
26 words
A fastener as defined in claim 1 wherein said recess is oversized and wherein said cover means reduces the size thereof to a final desired size.
Claim 4
Dependent Claim
40 words
A fastener as defined in claim 1 wherein said head portion outer perimeter is substantially square in configuration and wherein said recess extends outwardly from the longitudinal axis of said head and shank portions along the diagonals of said perimeter.
Claim 5
Dependent Claim
15 words
A fastener as defined in claim 1 wherein said cover means comprises moldable plastic material.
Claim 6
Dependent Claim
17 words
A fastener as defined in claim 1 wherein said cover means defines a generally circular outer perimeter.
Claim 7
Dependent Claim
40 words
A fastener as defined in claim 2 wherein said head portion outer perimeter is substantially square in configuration and wherein said recess extends outwardly from the longitudinal axis of said head and shank portions along the diagonals of said perimeter.
Claim 8
Dependent Claim
15 words
A fastener as defined in claim 6 wherein said cover means comprises moldable plastic material.
Claim 9
Dependent Claim
17 words
A fastener as defined in claim 7 wherein said cover means defines a generally circular outer perimeter.
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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) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |