US4630985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self aligning screw
Assignee: Individual
•
Filing: 1984-01-12
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Granted: 1986-12-23
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Expires: 2004-01-12
Abstract
Abstract The screw has a conventional threaded body, and a tapered leading end for easy entry to a tapped hole. A projection extends radially from the tapered end portion and when the longitudinal center lines of the screw and hole are misaligned, makes first contact with the threads on the tapped hole. As the screw is turned, the projection follows the tapped threads of the hole to bring the machine screw into alignment. When the projection tracks the internal hole threads, the positional relationship between the projection and the first screw thread brings the starting point of the first screw thread into contact with the starting point of the first thread at the entrance of the tapped hole.
Inventors
- 👤 Leon Simons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:15
CPC Classifications
F; F16; F16B; F16B35/00; F16B35/04; F16B35/041; F16B35/044; F16B35/047
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
248 words
A self-aligning screw for use in a pre-threaded opening, the self-aligning screw comprising: a screw body of extended length, the screw body having a longitudinal axis in the body length direction; a screw thread spirally encircling at least a portion of the body, the screw thread adapted to engage a thread in a pre-threaded opening; a leading end on the screw body, the leading end extending in the lengthwise direction of the body and being adapted to precede the screw body into the pre-threaded opening; and a sole projection extending from the leading end of the screw body in a direction generally transverse to the axis, the projection being joined at a first end to the leading end of the screw body, the other end of the projection being free, the projection being positioned and contoured at the free end for nesting within the groove between adjacent threads of the pre-threaded opening when the screw thread and the thread of the pre-threaded opening are engaged, the projection comprising a conical segment having a rounded end, the projection being so positioned on the screw body relative to the start of the screw thread that, when the screw enters the pre-threaded opening, contact of the projection at any point along the outward-facing surface of the thread in the pre-threaded opening will serve to guide the screw thread into mating engagement with the thread of the pre-threaded opening as the screw and the pre-threaded opening are turned relative to one another.
Claim 2
Dependent Claim
248 words
A self-aligning screw for use in a pre-threaded opening, the self-aligning screw comprising: a screw body of extended length, the screw body having a longitudinal axis in the body length direction; a screw thread spirally encircling at least a portion of the body, the screw thread adapted to engage a thread in a pre-threaded opening; a leading end on the screw body, the leading end extending in the lengthwise direction of the body and being adapted to precede the screw body into the pre-threaded opening; and a sole projection extending from the leading end of the screw body in a direction generally transverse to the axis, the projection being joined at a first end to the leading end of the screw body, the other end of the projection being free, the projection being positioned and contoured at the free end for nesting within the groove between adjacent threads of the pre-threaded opening when the screw thread and the thread of the pre-threaded opening are engaged, the projection comprising a conical segment having a rounded end, the projection being so positioned on the screw body relative to the start of the screw thread that, when the screw enters the pre-threaded opening, contact of the projection at any point along the outward-facing surface of the thread in the pre-threaded opening will serve to guide the screw thread into mating engagement with the thread of the pre-threaded opening as the screw and the pre-threaded opening are turned relative to one another.
Claim 3
Dependent Claim
247 words
A self-aligning screw for use in a pre-threaded opening, the self-aligning screw comprising: a screw body of extended length, the screw body having a longitudinal axis in the body length direction; a screw thread spirally encircling at least a portion of the body, the screw thread adapted to engage a thread in a pre-threaded opening; a leading end on the screw body, the leading end extending in the lengthwise direction of the body and being adapted to precede the screw body into the pre-threaded opening; and a projection extending from the leading end of the screw body in a direction generally transverse to the axis, the projection being joined at a first end to the leading end of the screw body, the other end of the projection being free, the projection being positioned and contoured at the free end for nesting within the groove between adjacent threads of the pre-threaded opening when the screw thread and the thread of the pre-threaded opening are engaged, the projection comprising a conical segment having a rounded end, the projection being so positioned on the screw body relative to the start of the screw thread that, when the screw enters the pre-threaded opening, contact of the projection at any point along the outward surface of the thread in the pre-threaded opening will serve to guide the screw thread into mating engagement with the thread of the pre-threaded opening as the screw and the pre-threaded opening are turned relative to one another.
Claim 4
Dependent Claim
247 words
A self-aligning screw for use in a pre-threaded opening, the self-aligning screw comprising: a screw body of extended length, the screw body having a longitudinal axis in the body length direction; a screw thread spirally encircling at least a portion of the body, the screw thread adapted to engage a thread in a pre-threaded opening; a leading end on the screw body, the leading end extending in the lengthwise direction of the body and being adapted to precede the screw body into the pre-threaded opening; and a projection extending from the leading end of the screw body in a direction generally transverse to the axis, the projection being joined at a first end to the leading end of the screw body, the other end of the projection being free, the projection being positioned and contoured at the free end for nesting within the groove between adjacent threads of the pre-threaded opening when the screw thread and the thread of the pre-threaded opening are engaged, the projection comprising a conical segment having a rounded end, the projection being so positioned on the screw body relative to the start of the screw thread that, when the screw enters the pre-threaded opening, contact of the projection at any point along the outward surface of the thread in the pre-threaded opening will serve to guide the screw thread into mating engagement with the thread of the pre-threaded opening as the screw and the pre-threaded opening are turned relative to one another.
Claim 5
Dependent Claim
125 words
A self-aligning screw comprising: a screw body of extended length and having a longitudinal axis in the body length direction and one end being adapted for first entry of said screw into a threaded opening; screw threads spirally encircling at least a portion of said body; a projection extending from said one end of said screw body in a direction generally transverse to said axis, said projection being joined at a first end to said one end of said screw body, the other end of said projection being free, said projection being positioned and contoured at said free end for nesting within the groove of the threads of said threaded opening when said screw threads and said threads of said threaded opening are concentrically engaged.
Claim 6
Dependent Claim
125 words
A self-aligning screw comprising: a screw body of extended length and having a longitudinal axis in the body length direction and one end being adapted for first entry of said screw into a threaded opening; screw threads spirally encircling at least a portion of said body; a projection extending from said one end of said screw body in a direction generally transverse to said axis, said projection being joined at a first end to said one end of said screw body, the other end of said projection being free, said projection being positioned and contoured at said free end for nesting within the groove of the threads of said threaded opening when said screw threads and said threads of said threaded opening are concentrically engaged.
Claim 7
Dependent Claim
27 words
A self-aligning screw in accordance with claim 1, wherein the radial height of the sole transverse projection is less than the radial height of the screw thread.
Claim 8
Dependent Claim
18 words
A self-aligning screw in accordance with claim 4, wherein the sole projection is conical, having a rounded end.
Claim 9
Dependent Claim
23 words
A self-aligning screw in accordance with claim 1, wherein the sole transverse projection extends circumferentially about said leading end for less than 180°.
Claim 10
Dependent Claim
26 words
A self-aligning screw in accordance with claim 6, wherein the sole transverse projection has a crest whose curvature conforms to the curvature of the pre-threaded threads.
Claim 11
Dependent Claim
37 words
A self-aligning screw in accordance with claim 1, wherein the screw thread has a pre-determined pitch distance and wherein the sole projection is positioned an integral number of pitch distances from the starting point of the thread.
Claim 12
Dependent Claim
62 words
A self-aligning screw in accordance with claim 1, wherein the screw thread has a pre-determined pitch distance and wherein the sole projection is positioned on on the leading end by a fraction of the pitch distance, measured from the starting point of the thread, which is proportional to the angular displacement of said projection from the starting point of said screw thread.
References Cited (Backward Citations)
US1203546A
Cited
US2167910A
Cited
US2564029A
Cited
GB1105703A
Cited
US3438299A
Cited
US4069730A
Cited
US4439077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-22 | 1990-06-23 | 1990-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-22 | 1994-06-23 | 1994-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-22 | 1998-06-23 | 1998-12-23 | $7700.00 | Window Closed / Lapsed |