US3711138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fastening devices
Assignee: Davis Industrial Equipment Ltd
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Filing: 1970-01-27
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Granted: 1973-01-16
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Expires: 1990-01-27
Abstract
Abstract A fastening device for rapidly securing two parts, such as an inspection plate or cover on a main frame or casing in which the cover and frame or casing have plain holes drilled, stamped or otherwise formed therein so as to be in register in the assembled condition, the fastener having a helical land engageable with a pair of such holes by rotation while inclined to the plane of each hole and by continued rotation being movable relative to the cover and frame or casing to bring the margins defining the holes into engagement between a head of the fastener and an end face of the land which terminates short of the head.
Inventors
- 👤 M Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:53
CPC Classifications
F; F16; F16B; F16B35/00; F16B35/04; F16B35/041; F16B33/00; F16B33/02; F16B5/00; F16B5/02; Y; Y10; Y10S; Y10S411/00; Y10S411/919; Y10T; Y10T403/00; Y10T403/75
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
207 words
In combination, a fastening device and at least one substantially flat member having a circular aperture in which said fastening device is inserted, said fastening device comprising an elongated cylindrical shank, a head at one end of said shank having a diameter greater than that of said shank, and a helical land on said shank which terminates short of said head in a portion of progressively diminishing axial thickness to form a surface facing said head which is perpendicular to the axis of said shank, said head having a surface facing said land which is likewise perpendicular to the axis of said shank, the diameter of said shank between said head and perpendicular surface being at least as great as the diameter of said shank on the opposite side of the land portion of diminishing axial thickness from said head and the diameter of said aperture being at least equal to the diameter of said shank between said head and land, plus the radial depth of a land, but less than the outer diameter of the land, and the width of the groove defined by said land being substantially uniform and greater than the thickness of said at least one member throughout the length of said land.
Claim 2
Dependent Claim
207 words
In combination, a fastening device and at least one substantially flat member having a circular aperture in which said fastening device is inserted, said fastening device comprising an elongated cylindrical shank, a head at one end of said shank having a diameter greater than that of said shank, and a helical land on said shank which terminates short of said head in a portion of progressively diminishing axial thickness to form a surface facing said head which is perpendicular to the axis of said shank, said head having a surface facing said land which is likewise perpendicular to the axis of said shank, the diameter of said shank between said head and perpendicular surface being at least as great as the diameter of said shank on the opposite side of the land portion of diminishing axial thickness from said head and the diameter of said aperture being at least equal to the diameter of said shank between said head and land, plus the radial depth of a land, but less than the outer diameter of the land, and the width of the groove defined by said land being substantially uniform and greater than the thickness of said at least one member throughout the length of said land.
Claim 3
Dependent Claim
26 words
The combination according to claim 1 in which the fastening device includes a socket for engagement by a tool to turn and tilt the fastening device.
Claim 4
Dependent Claim
33 words
The combination according to claim 1 in which the fastening device includes a finger piece having a concave face to that side on which lies the end of the land adjacent the head.
Claim 5
Dependent Claim
31 words
The combination according to claim 1 in which the fastening device includes a finger piece inclined away from that side on which lies the end of the land adjacent the head.
Claim 6
Dependent Claim
23 words
The combination claimed in claim 1 which comprises a resilient member mounted on said shank between said head surface and said flat member.
Claim 7
Dependent Claim
296 words
In combination, a fastening device and a pair of substantially flat members having a circular aperture in which said fastening device is inserted, said fastening device comprising an elongated cylindrical shank, a head at one end of said shank having a diameter greater than that of said shank, and a helical land on said shank which terminates short of said head in a portion of progressively diminishing axial thickness to form a surface facing said head which is perpendicular to the axis of said shank, said head having a surface facing said land which is likewise perpendicular to the axis of said shank, the diameter of said shank between said head and perpendicular surface being at least as great as the diameter of said shank on the opposite side of the land portion of diminishing axial thickness from said head and the diameter of said aperture being at least equal to the diameter of said shank between said head and land, plus the radial dePth of a land, but less than the outer diameter of the land, and the width of the groove defined by said land being substantially uniform and greater than the thickness of said at least one member throughout the length of said land, said members being positioned between said head and said land, with one member having a first surface adjacent said head surface to form therewith a first pair of adjacent surfaces, and the other member having a first surface adjacent said land surface to form therewith a second pair of adjacent surfaces, and both members having a second surface, said second surfaces being adjacent each other to form a third pair of adjacent surfaces, and a resiliently compressible element held under compression between one of said pairs of adjacent surfaces.
Claim 8
Dependent Claim
296 words
In combination, a fastening device and a pair of substantially flat members having a circular aperture in which said fastening device is inserted, said fastening device comprising an elongated cylindrical shank, a head at one end of said shank having a diameter greater than that of said shank, and a helical land on said shank which terminates short of said head in a portion of progressively diminishing axial thickness to form a surface facing said head which is perpendicular to the axis of said shank, said head having a surface facing said land which is likewise perpendicular to the axis of said shank, the diameter of said shank between said head and perpendicular surface being at least as great as the diameter of said shank on the opposite side of the land portion of diminishing axial thickness from said head and the diameter of said aperture being at least equal to the diameter of said shank between said head and land, plus the radial dePth of a land, but less than the outer diameter of the land, and the width of the groove defined by said land being substantially uniform and greater than the thickness of said at least one member throughout the length of said land, said members being positioned between said head and said land, with one member having a first surface adjacent said head surface to form therewith a first pair of adjacent surfaces, and the other member having a first surface adjacent said land surface to form therewith a second pair of adjacent surfaces, and both members having a second surface, said second surfaces being adjacent each other to form a third pair of adjacent surfaces, and a resiliently compressible element held under compression between one of said pairs of adjacent surfaces.
Claim 9
Dependent Claim
215 words
In combination, a fastening device and a pair of substantially flat members having a circular aperture in which said fastening device is inserted, said fastening device comprising an elongated cylindrical shank, a head at one end of said shank having a diameter greater than that of said shank, and a helical land on said shank which terminates short of said head in a portion of progressively diminishing axial thickness to form a surface facing said head which is perpendicular to the axis of said shank, said head having a surface facing said land which is likewise perpendicular to the axis of said shank, the diameter of said shank between said head and perpendicular surface being at least as great as the diameter of said shank on the opposite side of the land portion of diminishing axial thickness from said head and the diameter of said aperture being at least equal to the diameter of said shank between said head and land, plus the radial depth of a land, but less than the outer diameter of the land, and the width of the groove defined by said land being substantially uniform and greater than the thickness of said at least one member throughout the length of said land and resilient means gripped between said flat members.
Claim 10
Dependent Claim
215 words
In combination, a fastening device and a pair of substantially flat members having a circular aperture in which said fastening device is inserted, said fastening device comprising an elongated cylindrical shank, a head at one end of said shank having a diameter greater than that of said shank, and a helical land on said shank which terminates short of said head in a portion of progressively diminishing axial thickness to form a surface facing said head which is perpendicular to the axis of said shank, said head having a surface facing said land which is likewise perpendicular to the axis of said shank, the diameter of said shank between said head and perpendicular surface being at least as great as the diameter of said shank on the opposite side of the land portion of diminishing axial thickness from said head and the diameter of said aperture being at least equal to the diameter of said shank between said head and land, plus the radial depth of a land, but less than the outer diameter of the land, and the width of the groove defined by said land being substantially uniform and greater than the thickness of said at least one member throughout the length of said land and resilient means gripped between said flat members.
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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) | 1976-01-16 | 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 |