US4197782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lockbolt joint and method of making a lockbolt joint
Assignee: Boeing Co
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Filing: 1978-08-23
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Granted: 1980-04-15
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Expires: 1998-08-23
Abstract
Abstract A lockbolt collar configured to reduce the longitudinal tension in a lockbolt which otherwise has the effect of reducing its cross section, and hence the tightness of its fit where it passes through the secured parts, the longitudinal tension being caused by the swaging of the collar onto the lockbolt. An external taper of the collar toward its end adjacent the secured parts commencing at a location intermediate its ends provides a spatial cavity within the swaging die of sufficient size to receive collar material displaced during swaging and thereby significantly reduce the reverse flow of such collar material causing such longitudinal tension in the lockbolt.
Inventors
- 👤 Louis A. Champoux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:49
CPC Classifications
F; F16; F16B; F16B19/00; F16B19/04; F16B19/05; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49909
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
207 words
A lockbolt joint comprising: a workpiece having an aperture therethrough; a lockbolt having a shank extending through and fitting snugly in said aperture and having a portion projecting outwardly beyond one surface of said workpiece; a lock collar swaged about said portion and having a final peripheral bulge adjacent said one surface, said final peripheral bulge having a converging portion which converges toward said one surface immediately adjacent said one surface, said final peripheral bulge being formed by swaging of a collar about said lockbolt with a swaging tool having an interior configuration which initially forces said collar into contact with said lockbolt and forms a transitory peripheral bulge of collar material at the end of said collar not adjacent said workpiece, and which forces said transitory bulge to be displaced progressively along the length of said collar as said collar is swaged into engagement with said lockbolt, the portion of said swaging tool immediately adjacent said one surface being sized to accommodate more than all said collar material therein upon engagement of said tool with said workpiece, thereby forming said final peripheral bulge, whereby longitudinal flow of said collar material in a direction away from said workpiece is minimized, thus preventing excessive tension on said lockbolt.
Claim 2
Dependent Claim
207 words
A lockbolt joint comprising: a workpiece having an aperture therethrough; a lockbolt having a shank extending through and fitting snugly in said aperture and having a portion projecting outwardly beyond one surface of said workpiece; a lock collar swaged about said portion and having a final peripheral bulge adjacent said one surface, said final peripheral bulge having a converging portion which converges toward said one surface immediately adjacent said one surface, said final peripheral bulge being formed by swaging of a collar about said lockbolt with a swaging tool having an interior configuration which initially forces said collar into contact with said lockbolt and forms a transitory peripheral bulge of collar material at the end of said collar not adjacent said workpiece, and which forces said transitory bulge to be displaced progressively along the length of said collar as said collar is swaged into engagement with said lockbolt, the portion of said swaging tool immediately adjacent said one surface being sized to accommodate more than all said collar material therein upon engagement of said tool with said workpiece, thereby forming said final peripheral bulge, whereby longitudinal flow of said collar material in a direction away from said workpiece is minimized, thus preventing excessive tension on said lockbolt.
Claim 3
Dependent Claim
49 words
The lockbolt joint defined in claim 1 in which said portion has an annular lock rib spaced from said one surface, and said lock collar is swaged into intimate contact with said lock rib, securing said lockbolt and said lock collar against relative movement with respect to said workpiece.
Claim 4
Dependent Claim
94 words
The lockbolt joint defined in claim 1, wherein said collar before being swaged about said lockbolt has a generally ring-like shape and a central, generally straight axial bore which permits said portion of the lockbolt to be passed therethrough, said collar having a radial thickness varying along its length, including a tapered region in which said radial thickness decreases in the direction of said one surface, said tapered region being so contoured relative to said interior configuration of said swaging tool to accommodate said collar material therein when said tool engages said one surface.
Claim 5
Dependent Claim
33 words
The lockbolt joint defined in claim 3, wherein said tapered region extends from substantially the longitudinal midpoint of said collar to substantially the end thereof abutted to said one surface of said workpiece.
Claim 6
Dependent Claim
19 words
The lockbolt joint defined in claim 4, wherein said tapered region forms a substantially uniform taper over its length.
Claim 7
Dependent Claim
22 words
The lockbolt joint defined in claim 5, wherein said uniform taper is substantially within the range of 8 degrees to 18 degrees.
Claim 8
Independent Claim
268 words
A method of making a lockbolt joint wherein a swaging tool is used to swage a lock collar onto an end portion of a lockbolt protruding through an aperture in a workpiece, comprising the steps of: fitting the shank of said lockbolt snugly through said aperture in said workpiece so that said end portion of said shank projects beyond one surface of said workpiece; placing said lock collar over said end portion of said shank, and; applying a swaging force with said swaging tool to said lock collar, said swaging tool having an interior configuration which initially forms a transitory peripheral bulge of collar material upon being forced over said lock collar toward said workpiece, the portion of said interior configuration closest to said workpiece being sufficiently large to accommodate more than all of said collar material contained therein when said tool engages said workpiece, said force being applied in the direction toward said workpiece until said swaging tool engages said one surface of said workpiece, said swaging tool thereby causing said transitory peripheral bulge to be initially formed at the end of said lock collar spaced from said workpiece and to be displaced progressively along the length of said lock collar towards said one surface of said workpiece, said swaging tool upon engaging said one surface of said workpiece thereby forming a final peripheral bulge having a converging portion which converges toward said one surface immediately adjacent said one surface, longitudinal flow of said lock collar material in a direction away from said workpiece thereby being minimized and excessive longitudinal tension on said lockbolt thereby being prevented.
Claim 9
Independent Claim
268 words
A method of making a lockbolt joint wherein a swaging tool is used to swage a lock collar onto an end portion of a lockbolt protruding through an aperture in a workpiece, comprising the steps of: fitting the shank of said lockbolt snugly through said aperture in said workpiece so that said end portion of said shank projects beyond one surface of said workpiece; placing said lock collar over said end portion of said shank, and; applying a swaging force with said swaging tool to said lock collar, said swaging tool having an interior configuration which initially forms a transitory peripheral bulge of collar material upon being forced over said lock collar toward said workpiece, the portion of said interior configuration closest to said workpiece being sufficiently large to accommodate more than all of said collar material contained therein when said tool engages said workpiece, said force being applied in the direction toward said workpiece until said swaging tool engages said one surface of said workpiece, said swaging tool thereby causing said transitory peripheral bulge to be initially formed at the end of said lock collar spaced from said workpiece and to be displaced progressively along the length of said lock collar towards said one surface of said workpiece, said swaging tool upon engaging said one surface of said workpiece thereby forming a final peripheral bulge having a converging portion which converges toward said one surface immediately adjacent said one surface, longitudinal flow of said lock collar material in a direction away from said workpiece thereby being minimized and excessive longitudinal tension on said lockbolt thereby being prevented.
Claim 10
Dependent Claim
98 words
The method of claim 7 wherein said collar, prior to being swaged about said lockbolt, has a generally ring-like shape and a central, generally straight axial bore which permits said portion of the lockbolt to be passed therethrough, said collar having a radial thickness varying along its length and including a tapered region in which said radial thickness decreases in the direction of the collar adjacent said one surface, said tapered region being so contoured relative to said interior configuration of said swaging tool as to accommodate said collar material therein when said tool engages said one surface.
Claim 11
Dependent Claim
33 words
The lockbolt joint defined in claim 8 wherein said tapered region extends from substantially the longitudinal midpoint of said collar to substantially the end thereof abutted to said one surface of said workpiece.
Claim 12
Dependent Claim
19 words
The lockbolt joint defined in claim 9 wherein said tapered region forms a substantially uniform taper over its length.
Claim 13
Dependent Claim
33 words
The lockbolt joint defined in claim 10 wherein said uniform taper has a taper angle relative to the longitudinal centerline of the collar substantially within the range of 8 degrees to 18 degrees.
Claim 14
Dependent Claim
130 words
A lockbolt joint comprising: a workpiece having an aperture therethrough; a lockbolt having a shank extending through and fitting snugly in said aperture and having a portion projecting outwardly beyond one surface of said workpiece; a lock collar swaged about said portion and having a final peripheral bulge adjacent said one surface, said final peripheral bulge having a converging portion that converges toward said one surface immediately adjacent said one surface, said peripheral bulge having accumulated collar material moved at least in part axially by a swaging die during swaging, said swaging die being sized to accommodate said collar material therein without substantial axial flow of said collar material away from said one surface when the forward end thereof engages said one surface at the end of a swaging stroke.
Claim 15
Dependent Claim
130 words
A lockbolt joint comprising: a workpiece having an aperture therethrough; a lockbolt having a shank extending through and fitting snugly in said aperture and having a portion projecting outwardly beyond one surface of said workpiece; a lock collar swaged about said portion and having a final peripheral bulge adjacent said one surface, said final peripheral bulge having a converging portion that converges toward said one surface immediately adjacent said one surface, said peripheral bulge having accumulated collar material moved at least in part axially by a swaging die during swaging, said swaging die being sized to accommodate said collar material therein without substantial axial flow of said collar material away from said one surface when the forward end thereof engages said one surface at the end of a swaging stroke.
Claim 16
Dependent Claim
66 words
The lockbolt joint of claim 12 wherein said lock collar prior to swaging has a generally ring-like shape and a central, generally straight axial bore which permits said portion of the lockbolt to be passed therethrough, said collar having a radial thickness varying along its length, including a tapered region in which said radial thickness decreases in the direction of the collar adjacent said one surface.
Claim 17
Dependent Claim
33 words
The lockbolt joint defined in claim 13 wherein said tapered region extends from substantially the longitudinal midpoint of said collar to substantially the end thereof abutted to said one surface of said workpiece.
Claim 18
Dependent Claim
19 words
The lockbolt joint defined in claim 14 wherein said tapered region forms a substantially uniform taper over its length.
Claim 19
Dependent Claim
33 words
The lockbolt joint defined in claim 15 wherein said uniform taper has a taper angle relative to the longitudinal centerline of the collar substantially within the range of 8 degrees to 18 degrees.
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) | 1983-04-15 | 1983-10-15 | 1984-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-15 | 1987-10-15 | 1988-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-15 | 1991-10-15 | 1992-04-15 | $7700.00 | Window Closed / Lapsed |