US3752203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lock-screw fasteners
Assignee: HILL FASTENER CORP
•
Filing: 1971-07-28
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Granted: 1973-08-14
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Expires: 1991-07-28
Abstract
Abstract The present lock-screw fasteners involve the provision of a ring of inclined V or chevron-shaped locking projections on the underside of an annular flange on the head of a lock-screw or a locknut, these projections being arranged so that the points, all of which are on a circle around the center line, are in trailing relation in the tightening of the screw or nut and are accordingly in leading relationship to take the best possible hold in turning in the opposite direction for a good locking action. In the tightening, razor sharp edges are swedged on the projections to increase the take-hold action to resist turning in a loosening direction.
Inventors
- 👤 W Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:53
CPC Classifications
F; F16; F16B; F16B39/00; F16B39/22; F16B39/28; F16B39/282; Y; Y10; Y10S; Y10S411/00; Y10S411/955; Y10S411/956; Y10S411/957; Y10S411/959
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
344 words
A fastener for a work piece comprising: a body having a center line and an annular work-piece engaging surface; a threaded portion of said fastener extending in a direction transverse to said annular work piece engaging surface; said surface including a plurality of projections extending therefrom; said projections being arranged in a circle on said annular surface; certain of said projections each being inclined at an acute angle relAtive to the surface with their high ends in substantially the same plane normal to said center line; each of said high ends lying in a circle and pointing in the opposite direction in relation to the direction of tightening of the fastener, whereby said high ends offer low resistance to tightening and high resistance to loosening said fastener; each of said projections having a first side surface and a second side surface extending downwardly from said high end; each of said first side surfaces extending in a direction inwardly of said circle and in the direction of tightening said fastener; each of said second side sufaces extending in a direction outwardly of said circle and in the direction of tightening of said fastener; each of said first side surfaces intercepting a second side surface substantially along said circle, whereby a ridge extending from each high end downwardly to the base of another of said projections is formed such that a section taken along said circle through said projections is in the form of a sawtooth; the upper edge of said first and second side surfaces facing in the opposite direction in relation to the direction of tightening said fastener and extending downwardly from said high ends and in the direction of tightening of the fastener, whereby said upper edges form a plurality of V-shaped edges opening in the direction of tightening said fastener; first and second front surfaces; said first and second front surfaces intersecting said first and second side surfaces respectively at said upper edge and having a slope greater than the slope of said side surfaces, whereby said upper edge is relatively sharp.
Claim 2
Dependent Claim
344 words
A fastener for a work piece comprising: a body having a center line and an annular work-piece engaging surface; a threaded portion of said fastener extending in a direction transverse to said annular work piece engaging surface; said surface including a plurality of projections extending therefrom; said projections being arranged in a circle on said annular surface; certain of said projections each being inclined at an acute angle relAtive to the surface with their high ends in substantially the same plane normal to said center line; each of said high ends lying in a circle and pointing in the opposite direction in relation to the direction of tightening of the fastener, whereby said high ends offer low resistance to tightening and high resistance to loosening said fastener; each of said projections having a first side surface and a second side surface extending downwardly from said high end; each of said first side surfaces extending in a direction inwardly of said circle and in the direction of tightening said fastener; each of said second side sufaces extending in a direction outwardly of said circle and in the direction of tightening of said fastener; each of said first side surfaces intercepting a second side surface substantially along said circle, whereby a ridge extending from each high end downwardly to the base of another of said projections is formed such that a section taken along said circle through said projections is in the form of a sawtooth; the upper edge of said first and second side surfaces facing in the opposite direction in relation to the direction of tightening said fastener and extending downwardly from said high ends and in the direction of tightening of the fastener, whereby said upper edges form a plurality of V-shaped edges opening in the direction of tightening said fastener; first and second front surfaces; said first and second front surfaces intersecting said first and second side surfaces respectively at said upper edge and having a slope greater than the slope of said side surfaces, whereby said upper edge is relatively sharp.
Claim 3
Dependent Claim
49 words
A fastener according to claim 1 in which the high ends are upwardly turned and sharply pointed whereby the trailing edges of the projections in the tightening of the fastener are swaged to define sharp edges for improved take-hold action when the fastener is turned in a loosening direction.
Claim 4
Dependent Claim
23 words
A fastener according to claim 1 in which the work-piece engaging surface is provided on the bottom of the head of a screw.
Claim 5
Dependent Claim
33 words
A fastener according to claim 3 in which the head of the screw includes a flange positioned along its lower surface, said work-piece engaging surface being provided on the bottom of said flange;
Claim 6
Dependent Claim
20 words
A fastener according to claim 1 in which said work-piece engaging surface is formed on the bottom of a lock-nut.
Claim 7
Dependent Claim
30 words
A fastener according to claim 5 in which said lock-nut includes a flange extending from one of its surfaces; said work-piece engaging surface being upon one surface of said flange.
References Cited (Backward Citations)
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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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |