US3746067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shear-resistant captive screw
Assignee: Deutsch Fastener Corp
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Filing: 1971-12-15
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Granted: 1973-07-17
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Expires: 1991-12-15
Abstract
Abstract A captive screw including a sleeve having a bore substantially complementarily receiving a relatively large diameter portion of the shank of a screw inwardly of the screw head, with an annular enlargement on the shank, of greater diameter than the bore, being located at the end of this shank portion and retaining the screw to the sleeve. Beyond the annular enlargement, the shank is provided with an annular groove and rolled threads on its outer end. The sleeve includes a head at one end and an enlarged bore portion at the opposite end providing a relatively thin wall adapted to be bent outwardly to secure the sleeve to a workpiece.
Inventors
- 👤 B Gulistan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:55
CPC Classifications
F; F16; F16B; F16B41/00; F16B41/002; B; B21; B21H; B21H3/00; B21H3/02; B21H7/00; B21H7/18; F16B35/00; F16B35/04; F16B35/041; F16B43/00; F16B5/00; F16B5/02; F16B5/0208; F16B2043/008; Y; Y10; Y10S; Y10S411/00; Y10S411/999; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49915; Y10T29/4992
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
329 words
A fastener comprising a one-piece screw, said screw having a head at one end and a shank projecting from said head, said shank having a portion of a first diameter adjacent said head, an integral annular enlargement of a greater diameter than said first diameter spaced outwardly from said head and positioned at the end of said portion of a first diameter, said integral annular enlargement having a cylindrical outer surface, and defining a substantially radial shoulder, said head connecting to said portion of a first diameter, an annular groove, said annular groove being arcuate and concave in cross section, one end of said annular groove extending to said annular enlargement, and a distal end portion extending outwardly from the opposite end of said groove, said distal end portion having external threads thereon, said external threads having a major diameter which is no greater than said first diameter, and a sleeve, said sleeve having a head at one end, said sleeve having a cylindrical exterior surface of constant diameter extending from said head to the opposite end of said sleeve, said sleeve including a first bore portion receiving said portion of said shank of a first diameter, said first bore portion being of smaller diameter than the diameter of said cylindrical outer surface of said annular enlargement and of said head of said screw, and being shorter than said portion of said shank of a first diameter, whereby said shank is retained by said sleeve with freedom for limited axial movement relative thereto, and a second bore portion, said second bore portion being of relatively large diameter and extending inwardly from the opposite end of said sleeve so as to provide said sleeve with a relatively thin wall bendable outwardly for forming a flange for cooperating with said head of said sleeve in holding said sleeve to a workpiece, said second bore portion being of greater diameter than said diameter of said cylindrical outer surface of said annular enlargement.
Claim 2
Dependent Claim
329 words
A fastener comprising a one-piece screw, said screw having a head at one end and a shank projecting from said head, said shank having a portion of a first diameter adjacent said head, an integral annular enlargement of a greater diameter than said first diameter spaced outwardly from said head and positioned at the end of said portion of a first diameter, said integral annular enlargement having a cylindrical outer surface, and defining a substantially radial shoulder, said head connecting to said portion of a first diameter, an annular groove, said annular groove being arcuate and concave in cross section, one end of said annular groove extending to said annular enlargement, and a distal end portion extending outwardly from the opposite end of said groove, said distal end portion having external threads thereon, said external threads having a major diameter which is no greater than said first diameter, and a sleeve, said sleeve having a head at one end, said sleeve having a cylindrical exterior surface of constant diameter extending from said head to the opposite end of said sleeve, said sleeve including a first bore portion receiving said portion of said shank of a first diameter, said first bore portion being of smaller diameter than the diameter of said cylindrical outer surface of said annular enlargement and of said head of said screw, and being shorter than said portion of said shank of a first diameter, whereby said shank is retained by said sleeve with freedom for limited axial movement relative thereto, and a second bore portion, said second bore portion being of relatively large diameter and extending inwardly from the opposite end of said sleeve so as to provide said sleeve with a relatively thin wall bendable outwardly for forming a flange for cooperating with said head of said sleeve in holding said sleeve to a workpiece, said second bore portion being of greater diameter than said diameter of said cylindrical outer surface of said annular enlargement.
Claim 3
Dependent Claim
342 words
A fastener comprising a one-piece screw, said screw having a head at one end and a shank projecting from said head, said head having a substantially radial outer surface and a frustoconical undersurface, said shank having a portion of a first diameter adjacent said head, an integral annular enlargement of a greater diameter than said first diameter spaced outwardly from said head and positioned at the end of said portion of a first diameter, an annular groove, said annular groove being arcuate and concave in cross section, one end of said annular groove extending to said annular enlargement, and a distal end portion extending outwardly from the opposite end of said groove, said distal end portion having external threads thereon, said external threads having a major diameter which is no greater than said first diameter, and a sleeve, said sleeve having a head at one end, said head having a frustoconical undersurface, said sleeve having a cylindrical exterior surface of constant diameter extending from said head to the opposite end of said sleeve, said sleeve including a first bore portion extending inwardly from said one end thereof, said first bore portion being frustoconical and adapted to complementarily engage said undersurface of said head of said screw, an intermediate bore portion receiving said portion of said shank of a first diameter, said intermediate bore portion being of smaller diameter than the diameter of said annular enlargement and of said head of said screw, and being shorter than said portion of said shank of a first diameter, whereby said shank is retained by said sleeve with freedom for limited axial movement relative thereto, and a third bore portion, said third bore portion being of relatively large diameter and extending inwardly from the opposite end of said sleeve so as to provide said sleeve with a relatively thin wall bendable outwardly for forming a flange for cooperating with said undersurface of said head of said sleeve in holding said sleeve to a workpiece, said third bore portion being of greater diameter than said annular enlargement.
Claim 4
Dependent Claim
342 words
A fastener comprising a one-piece screw, said screw having a head at one end and a shank projecting from said head, said head having a substantially radial outer surface and a frustoconical undersurface, said shank having a portion of a first diameter adjacent said head, an integral annular enlargement of a greater diameter than said first diameter spaced outwardly from said head and positioned at the end of said portion of a first diameter, an annular groove, said annular groove being arcuate and concave in cross section, one end of said annular groove extending to said annular enlargement, and a distal end portion extending outwardly from the opposite end of said groove, said distal end portion having external threads thereon, said external threads having a major diameter which is no greater than said first diameter, and a sleeve, said sleeve having a head at one end, said head having a frustoconical undersurface, said sleeve having a cylindrical exterior surface of constant diameter extending from said head to the opposite end of said sleeve, said sleeve including a first bore portion extending inwardly from said one end thereof, said first bore portion being frustoconical and adapted to complementarily engage said undersurface of said head of said screw, an intermediate bore portion receiving said portion of said shank of a first diameter, said intermediate bore portion being of smaller diameter than the diameter of said annular enlargement and of said head of said screw, and being shorter than said portion of said shank of a first diameter, whereby said shank is retained by said sleeve with freedom for limited axial movement relative thereto, and a third bore portion, said third bore portion being of relatively large diameter and extending inwardly from the opposite end of said sleeve so as to provide said sleeve with a relatively thin wall bendable outwardly for forming a flange for cooperating with said undersurface of said head of said sleeve in holding said sleeve to a workpiece, said third bore portion being of greater diameter than said annular enlargement.
Claim 5
Dependent Claim
25 words
A device as recited in claim 2 in which said intermediate bore portion is relatively short, being shorter than said first and third bore portions.
Claim 6
Dependent Claim
45 words
A device as recited in claim 3 in which said annular enlargement provides a substantially radial shoulder adjacent said head of said screw, and a cylindrical outer surface, the diameter of said cylindrical outer surface being less than said diameter of said third bore portion.
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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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |