US4233878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Barb and method of making same
Assignee: Aerpat AG
•
Filing: 1978-07-25
•
Granted: 1980-11-18
•
Expires: 1998-07-25
Abstract
Abstract A barb for engagement with a body 13 of deformable material such as nylon has a sharp edge 28 at the top of a relatively steep face 29 forming one side of a trough 32. A ledge or rim 38 projects from the face 29, about halfway up the face 29, and provides an abutment which restricts the extent to which the deformable material can enter the trough. This improves the resistance of the barb against being pulled out of the trough. This form of barb is particularly applicable to fasteners of the type in which a threadless bolt having barbs is embedded in a shell carrying a nylon sleeve. The barb is manufactured by a rolling process in which two dies are successively applied to a cylindrical blank, the first die to form the trough 32, and the second die to form the ledge 38.
Inventors
- 👤 Hugh K. McGauran
- 👤 Leonard Saunders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:20
CPC Classifications
F; F16; F16B; F16B5/00; F16B5/06; F16B5/0607; F16B5/0621; F16B5/0642; B; B21; B21H; B21H3/00; B21H3/02; B21H3/06; F16B19/00; F16B19/02
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
94 words
A barb of circular symmetry for engagement with deformable material, which barb is formed by a rolling process and comprises: a radially outermost edge for engaging with the deformable material, the edge being provided at the junction of a first face and a second face, the first face being relatively more steeply sloping than the second face; a trough adjacent the aforesaid first face; the trough containing an abutment projecting from the aforesaid first face and radially intermediate in position between the radially outermost edge of the barb and the root of the trough.
Claim 2
Dependent Claim
94 words
A barb of circular symmetry for engagement with deformable material, which barb is formed by a rolling process and comprises: a radially outermost edge for engaging with the deformable material, the edge being provided at the junction of a first face and a second face, the first face being relatively more steeply sloping than the second face; a trough adjacent the aforesaid first face; the trough containing an abutment projecting from the aforesaid first face and radially intermediate in position between the radially outermost edge of the barb and the root of the trough.
Claim 3
Dependent Claim
96 words
A barb of circular symmetry formed by a rolling process for engagement with deformable material to resist withdrawal therefrom, which barb comprises: a radially outermost edge for engaging with the deformable material and deflecting it radially inwardly on attempted withdrawal; a trough on the side of the outer edge towards the direction of withdrawal for receiving deflected deformable material; and an abutment positioned between the root of the trough and the aforesaid radially outermost edge and radially outwardly of the root of the trough for limiting the extent to which deformable material can enter the trough.
Claim 4
Dependent Claim
96 words
A barb of circular symmetry formed by a rolling process for engagement with deformable material to resist withdrawal therefrom, which barb comprises: a radially outermost edge for engaging with the deformable material and deflecting it radially inwardly on attempted withdrawal; a trough on the side of the outer edge towards the direction of withdrawal for receiving deflected deformable material; and an abutment positioned between the root of the trough and the aforesaid radially outermost edge and radially outwardly of the root of the trough for limiting the extent to which deformable material can enter the trough.
Claim 5
Dependent Claim
69 words
A barb of circular symmetry formed by a rolling process for engagement with deformable material to resist withdrawal therefrom, which barb comprises: radially outermost edge for engaging the deformable material; an annular face radially inwardly of the radially outermost edge and facing generally in the direction of withdrawal; and an abutment projecting from the aforesaid annular face and radially intermediate the inner and outer edges of the annular face.
Claim 6
Dependent Claim
69 words
A barb of circular symmetry formed by a rolling process for engagement with deformable material to resist withdrawal therefrom, which barb comprises: radially outermost edge for engaging the deformable material; an annular face radially inwardly of the radially outermost edge and facing generally in the direction of withdrawal; and an abutment projecting from the aforesaid annular face and radially intermediate the inner and outer edges of the annular face.
Claim 7
Dependent Claim
110 words
A barb of circular symmetry formed by a rolling process for engagement with deformable material to resist withdrawal therefrom, which barb comprises: a radially outermost edge for engaging with and deflecting radially inwardly deformable material on attempted withdrawal of the barb therefrom; an annular face radially inwardly of the radially outermost edge and facing generally in the direction of withdrawal for abutment with said deflected deformable material; and an abutment projecting from the aforesaid annular face and radially intermediate the inner and outer edges of the annular face to limit the radially inward extent of deflection of deformable material to less than the full inwards radial extent of the face.
Claim 8
Dependent Claim
110 words
A barb of circular symmetry formed by a rolling process for engagement with deformable material to resist withdrawal therefrom, which barb comprises: a radially outermost edge for engaging with and deflecting radially inwardly deformable material on attempted withdrawal of the barb therefrom; an annular face radially inwardly of the radially outermost edge and facing generally in the direction of withdrawal for abutment with said deflected deformable material; and an abutment projecting from the aforesaid annular face and radially intermediate the inner and outer edges of the annular face to limit the radially inward extent of deflection of deformable material to less than the full inwards radial extent of the face.
Claim 9
Dependent Claim
17 words
A barb as claimed in claims 1, 2, 3 or 4 which the abutment comprises a ledge.
Claim 10
Independent Claim
87 words
A method of manufacturing a barb of circular symmetry by a rolling process, comprising the steps of rolling a radially outermost projecting protruberance and a trough adjacent thereto which trough has a face adjacent the protruberance, and thereafter rolling down part of the material adjacent the radially outer part of the face by means of a die which does not contact the radially innermost part of the trough to form an abutment projecting from the face at a position radially outwardly of the root of the trough.
Claim 11
Independent Claim
87 words
A method of manufacturing a barb of circular symmetry by a rolling process, comprising the steps of rolling a radially outermost projecting protruberance and a trough adjacent thereto which trough has a face adjacent the protruberance, and thereafter rolling down part of the material adjacent the radially outer part of the face by means of a die which does not contact the radially innermost part of the trough to form an abutment projecting from the face at a position radially outwardly of the root of the trough.
Claim 12
Independent Claim
165 words
A method of manufacturing a barb of circular symmetry by a rolling process, comprising the steps of rolling by means of a first die a radially outermost projecting protruberance and a trough adjacent thereto which trough has a face adjacent the protruberance, and thereafter rolling down by means of a second die part of the material adjacent the radially outer part of the face to form an abutment projecting from the face at a position radially outwardly from the root of the trough, wherein the two rolling dies could otherwise be used to manufacture by a multistage rolling process a similar barb without an abutment by applying the dies successively to a blank in predetermined relationship with each other axially of the blank, in which method the second rolling die is applied to the partly formed blank in a position displaced by a predetermined amount axially from said predetermined relationship with the first die, to roll down part of the material to form said abutment.
Claim 13
Independent Claim
165 words
A method of manufacturing a barb of circular symmetry by a rolling process, comprising the steps of rolling by means of a first die a radially outermost projecting protruberance and a trough adjacent thereto which trough has a face adjacent the protruberance, and thereafter rolling down by means of a second die part of the material adjacent the radially outer part of the face to form an abutment projecting from the face at a position radially outwardly from the root of the trough, wherein the two rolling dies could otherwise be used to manufacture by a multistage rolling process a similar barb without an abutment by applying the dies successively to a blank in predetermined relationship with each other axially of the blank, in which method the second rolling die is applied to the partly formed blank in a position displaced by a predetermined amount axially from said predetermined relationship with the first die, to roll down part of the material to form said abutment.
Claim 14
Dependent Claim
18 words
A barb of circular symmetry manufactured by a rolling process as claimed in claim 6 or claim 7.
Claim 15
Dependent Claim
18 words
A member carrying at least one barb as claimed in claims 1, 2, 3, 4, 5 or 8.
Claim 16
Dependent Claim
17 words
A member carrying a plurality of said barbs as claimed in claims 1, 2, 3 or 4.
Claim 17
Dependent Claim
42 words
A fastener comprising a first member as claimed in claim 10, in combination with a second member comprising a body of deformable material into which the first member can be inserted so that said barbs resist withdrawal of the first member therefrom.
Claim 18
Dependent Claim
12 words
A member carrying at least one barb as claimed in claim 8.
Claim 19
Dependent Claim
12 words
A member carrying a plurality of barbs as claimed in claim 8.
Claim 20
Dependent Claim
42 words
A fastener comprising a first member as claimed in claim 13, in combination with a second member comprising a body of deformable material into which the first member can be inserted so that said barbs resist withdrawal of the first member therefrom.
References Cited (Backward Citations)
CA651985A
Cited
US2172553A
Cited
US2126585A
Cited
US2785453A
Cited
GB820917A
Cited
US2926409A
Cited
US3009381A
Cited
GB881680A
Cited
US3196529A
Cited
FR1350099A
Cited
US3251260A
Cited
US3238835A
Cited
US3320712A
Cited
US3369289A
Cited
US3357204A
Cited
US3276308A
Cited
US3295404A
Cited
US3367228A
Cited
US3882917A
Cited
US3641865A
Cited
US3702088A
Cited
US3779127A
Cited
US3850215A
Cited
US3736834A
Cited
US3938587A
Cited
US4138921A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |