US3701372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lock bolt and method of making the same
Assignee: Russell Burdsall and Ward Corp
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Filing: 1970-09-04
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Granted: 1972-10-31
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Expires: 1990-09-04
Abstract
Abstract An external locking thread convolution is provided which deviates from a standard Class 5 interference-fit thread in that the space provided at the root of the thread form between adjacent locking threads is greater than the maximum space provided at this location for the standard class 5 thread. Also, an externally threaded locking fastener having such a locking thread convolution and a method for making such a locking fastener by a thread rolling operation is provided.
Inventors
- 👤 Arthur R Breed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:11
CPC Classifications
F; F16; F16B; F16B39/00; F16B39/22; F16B39/28; F16B39/30; Y; Y10; Y10S; Y10S411/00; Y10S411/924; Y10S411/929; Y10S411/938
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
515 words
A bolt comprising a head portion and a body portion extending axially outwardly from said head portion and having a longitudinally extending central axis, said body portion including a shank of a given diameter connected to said head portion, an external locking thread convolution rolled on said body portion outwardly of said shank and having a plurality of turns adapted to interfere with a standard internal thread convolution, said external locking thread convolution having a longitudinally extending central axis which is coincident with the longitudinally extending central axis of said body portion, and a standard external thread convolution rolled on said body portion outwardly of said locking thread convolution and adapted to mate with the standard internal thread convolution, said standard external thread convolution and said locking thread convolution being formed as a continuous external thread by rolling a blank having a uniform diameter equal to the given diameter of said shank, said bolt having a volume of material for one pitch length and turn of said locking thread convolution which is equal to the volume of material of said bolt for one pitch length and tUrn of said standard external thread convolution, said locking thread convolution having a thread angle and pitch which are the same as the thread angle and pitch of said standard external thread convolution and a metal width between its flanks which is greater than the maximum metal width between the flanks of the standard external thread convolution to provide uniform interference with the standard mating internal thread convolution, said locking thread convolution having a pitch diameter which is greater than the pitch diameter of said standard internal thread convolution and a major diameter which is less than the minimum major diameter of said standard external thread convolution to provide clearance space between the crest of said locking thread convolution and the root of the standard internal thread convolution freely accommodating metal swaged due to the interference between said standard internal thread convolution and said locking thread convolution, said locking thread convolution having a minor diameter which is less than the minor diameter of said standard external thread convolution to provide a recess space between adjacent turns of said locking thread convolution which is larger in an axial plane than the space defined by a recess triangle between adjacent turns and having sides coplanar with flanks of the adjacent turns of said locking thread convolution, said recess space having a bottom located inwardly of an imaginary apex of the recess triangle and side walls extending generally radially outwardly from said bottom of said recess to intersect the flanks of said locking thread convolution at locations inwardly of the pitch diameter of said standard external thread convolution, said recess space having a configuration in accordance with the following formula whereby the depth of said recess space and the distance between the generally radial side walls are of such dimensions as to provide for the displacement of sufficient metal to form said locking thread convolution upon a rolling of a blank having a uniform diameter equal to the diameter of said shank:
Claim 2
Dependent Claim
515 words
A bolt comprising a head portion and a body portion extending axially outwardly from said head portion and having a longitudinally extending central axis, said body portion including a shank of a given diameter connected to said head portion, an external locking thread convolution rolled on said body portion outwardly of said shank and having a plurality of turns adapted to interfere with a standard internal thread convolution, said external locking thread convolution having a longitudinally extending central axis which is coincident with the longitudinally extending central axis of said body portion, and a standard external thread convolution rolled on said body portion outwardly of said locking thread convolution and adapted to mate with the standard internal thread convolution, said standard external thread convolution and said locking thread convolution being formed as a continuous external thread by rolling a blank having a uniform diameter equal to the given diameter of said shank, said bolt having a volume of material for one pitch length and turn of said locking thread convolution which is equal to the volume of material of said bolt for one pitch length and tUrn of said standard external thread convolution, said locking thread convolution having a thread angle and pitch which are the same as the thread angle and pitch of said standard external thread convolution and a metal width between its flanks which is greater than the maximum metal width between the flanks of the standard external thread convolution to provide uniform interference with the standard mating internal thread convolution, said locking thread convolution having a pitch diameter which is greater than the pitch diameter of said standard internal thread convolution and a major diameter which is less than the minimum major diameter of said standard external thread convolution to provide clearance space between the crest of said locking thread convolution and the root of the standard internal thread convolution freely accommodating metal swaged due to the interference between said standard internal thread convolution and said locking thread convolution, said locking thread convolution having a minor diameter which is less than the minor diameter of said standard external thread convolution to provide a recess space between adjacent turns of said locking thread convolution which is larger in an axial plane than the space defined by a recess triangle between adjacent turns and having sides coplanar with flanks of the adjacent turns of said locking thread convolution, said recess space having a bottom located inwardly of an imaginary apex of the recess triangle and side walls extending generally radially outwardly from said bottom of said recess to intersect the flanks of said locking thread convolution at locations inwardly of the pitch diameter of said standard external thread convolution, said recess space having a configuration in accordance with the following formula whereby the depth of said recess space and the distance between the generally radial side walls are of such dimensions as to provide for the displacement of sufficient metal to form said locking thread convolution upon a rolling of a blank having a uniform diameter equal to the diameter of said shank:
Claim 3
Dependent Claim
20 words
A bolt as set forth in claim 1 wherein the radius R is substantially equal to the axial distance x.
Claim 4
Dependent Claim
35 words
A bolt as set forth in claim 1 wherein said standard external thread has a pitch diameter which is substantially equal to the diameter d of the cylindrical blank and the diameter of said shank.
Claim 5
Dependent Claim
404 words
A fastener having an external thread comprising a standard thread convolution and a locking thread convolution rolled on a blank having a longitudinally extending central axis and a uniform diameter, said locking thread convolution having a longitudinally extending centRal axis which is coincident with the longitudinally extending central axis of said blank, said standard external thread convolution being adapted to mate with a standard internal thread convolution and said rolled locking thread convolution having a plurality of turns adapted to interfere with said standard internal thread convolution and forming a continuation of said standard external thread convolution, said fastener having a volume of material for one pitch length and turn of said locking thread convolution which is equal to the volume of material of said fastener for one pitch length and turn of said standard external thread convolution, said locking thread convolution having a thread angle which is the same as that for said standard external thread convolution and a metal width between its flanks which is greater than the maximum width for said standard external thread convolution to provide uniform interference with the standard mating internal thread convolution along the flanks of said locking thread convolution, said locking thread convolution having a pitch diameter which is greater than the pitch diameter of said standard internal thread convolution and a major diameter which is less than the minimum major diameter of said standard external thread convolution to provide clearance space between the crests of said locking thread convolution and the root of the standard internal thread convolution for freely accommodating metal swaged due to the interference between said standard internal thread convolution and said locking thread convolution, said locking thread convolution having a recess space between adjacent turns thereof which is larger in an axial plane than the space defined by a triangle between the adjacent turns and having sides coplanar with flanks of the adjacent turns of said locking thread convolution, said recess space having a volume which corresponds to the volume of metal which must be displaced to effect the forming of said locking thread convolution during the rolling of said locking thread convolution on the blank, said recess having side walls extending generally radially from a bottom of said recess to intersect flanks of said locking thread convolution at locations inwardly of the pitch diameter of said standard external thread convolution and having a configuration in accordance with the following formula:
Claim 6
Dependent Claim
404 words
A fastener having an external thread comprising a standard thread convolution and a locking thread convolution rolled on a blank having a longitudinally extending central axis and a uniform diameter, said locking thread convolution having a longitudinally extending centRal axis which is coincident with the longitudinally extending central axis of said blank, said standard external thread convolution being adapted to mate with a standard internal thread convolution and said rolled locking thread convolution having a plurality of turns adapted to interfere with said standard internal thread convolution and forming a continuation of said standard external thread convolution, said fastener having a volume of material for one pitch length and turn of said locking thread convolution which is equal to the volume of material of said fastener for one pitch length and turn of said standard external thread convolution, said locking thread convolution having a thread angle which is the same as that for said standard external thread convolution and a metal width between its flanks which is greater than the maximum width for said standard external thread convolution to provide uniform interference with the standard mating internal thread convolution along the flanks of said locking thread convolution, said locking thread convolution having a pitch diameter which is greater than the pitch diameter of said standard internal thread convolution and a major diameter which is less than the minimum major diameter of said standard external thread convolution to provide clearance space between the crests of said locking thread convolution and the root of the standard internal thread convolution for freely accommodating metal swaged due to the interference between said standard internal thread convolution and said locking thread convolution, said locking thread convolution having a recess space between adjacent turns thereof which is larger in an axial plane than the space defined by a triangle between the adjacent turns and having sides coplanar with flanks of the adjacent turns of said locking thread convolution, said recess space having a volume which corresponds to the volume of metal which must be displaced to effect the forming of said locking thread convolution during the rolling of said locking thread convolution on the blank, said recess having side walls extending generally radially from a bottom of said recess to intersect flanks of said locking thread convolution at locations inwardly of the pitch diameter of said standard external thread convolution and having a configuration in accordance with the following formula:
Claim 7
Dependent Claim
26 words
A fastener as set forth in claim 4 wherein the radial extent of said side walls is no greater than six times the axial distance x.
Claim 8
Dependent Claim
17 words
A fastener as set forth in claim 4 wherein said bottom has a generally semicircular cross-sectional configuration.
Claim 9
Dependent Claim
25 words
A fastener as set fourth in claim 4 wheRein the root radius RR is less than the root radius of said standard external thread convolution,
Claim 10
Dependent Claim
413 words
A bolt comprising a head portion and a body portion extending axially outwardly from said head portion and having a longitudinally extending central axis, an external locking thread convolution rolled on said body portion and having a plurality of turns adapted to interfere with a standard internal thread convolution, said external locking thread convolution having a longitudinally extending central axis which is coincident with the longitudinally extending central axis of said body portion, and a standard external thread convolution rolled on said body portion outwardly of said locking thread convolution and adapted to mate with the standard internal thread convolution, said standard external thread convolution and said locking thread convolution being formed as a continuous external thread by rolling a blank having a uniform diameter, said bolt having a volume of material for one pitch length and turn of said locking thread convolution which is equal to the volume of material of said bolt for one pitch length and turn of said standard external thread convolution, said locking thread convolution having a metal width between its flanks which is greater than the maximum width between the flanks of the standard external thread convolution to provide interference with the standard mating internal thread convolution, said locking thread convolution having a major diameter which is less than the minimum major diameter of said standard external thread convolution to provide clearance space between the crest of said locking thread convolution and the root of the standard internal thread convolution for freely accommodating metal swaged due to the interference between said standard internal thread convolution and said locking thread convolution, said locking thread convolution having a minor diameter which is less than the minor diameter of said standard external thread convolution to provide a recess space between the root of adjacent turns of said locking thread convolution and the crest of the standard internal thread convolution which is larger in an axial plane than a space between the root of adjacent turns of said standard external thread convolution and the crest of the standard internal thread convolution and such that said recess space between adjacent turns of said locking thread convolution has a bottom located inwardly of the root of said standard external thread convolution to provide for the displacement of sufficient metal to form said locking thread convolutions upon a rolling of a blank having a uniform diameter, said recess space between adjacent turns of said locking thread convolution being in accordance with the following formula:
Claim 11
Dependent Claim
413 words
A bolt comprising a head portion and a body portion extending axially outwardly from said head portion and having a longitudinally extending central axis, an external locking thread convolution rolled on said body portion and having a plurality of turns adapted to interfere with a standard internal thread convolution, said external locking thread convolution having a longitudinally extending central axis which is coincident with the longitudinally extending central axis of said body portion, and a standard external thread convolution rolled on said body portion outwardly of said locking thread convolution and adapted to mate with the standard internal thread convolution, said standard external thread convolution and said locking thread convolution being formed as a continuous external thread by rolling a blank having a uniform diameter, said bolt having a volume of material for one pitch length and turn of said locking thread convolution which is equal to the volume of material of said bolt for one pitch length and turn of said standard external thread convolution, said locking thread convolution having a metal width between its flanks which is greater than the maximum width between the flanks of the standard external thread convolution to provide interference with the standard mating internal thread convolution, said locking thread convolution having a major diameter which is less than the minimum major diameter of said standard external thread convolution to provide clearance space between the crest of said locking thread convolution and the root of the standard internal thread convolution for freely accommodating metal swaged due to the interference between said standard internal thread convolution and said locking thread convolution, said locking thread convolution having a minor diameter which is less than the minor diameter of said standard external thread convolution to provide a recess space between the root of adjacent turns of said locking thread convolution and the crest of the standard internal thread convolution which is larger in an axial plane than a space between the root of adjacent turns of said standard external thread convolution and the crest of the standard internal thread convolution and such that said recess space between adjacent turns of said locking thread convolution has a bottom located inwardly of the root of said standard external thread convolution to provide for the displacement of sufficient metal to form said locking thread convolutions upon a rolling of a blank having a uniform diameter, said recess space between adjacent turns of said locking thread convolution being in accordance with the following formula:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |