Patent US3571903A successfully refreshed from Google Patents.
US3571903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of securing a self-piercing and clinching element to a sheet of metal
Assignee: International Business Machines Corp
•
Filing: 1968-12-13
•
Granted: 1971-03-23
•
Expires: 1988-12-13
Abstract
Abstract The invention pertains to a method and apparatus for securing a member to sheet material. The member is formed of material of equal or greater hardness than the sheet to which it is to be attached and in a single operation with a cooperating die is pressed against the sheet stock form its own aperture and deform the material of the sheet adjoining the member to positively secure member and sheet stock together. In an alternative embodiment the member is received in a prepared recess of a workpiece of hard material to effect attachment through a broaching action of the member with respect to the workpiece material.
Inventors
- 👤 Eric H Persson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:51
CPC Classifications
B; B23; B23P; B23P19/00; B23P19/04; B23P19/06; B23P19/062; F; F16; F16B; F16B12/00; F16B12/10; F16B12/12; F16B12/24; F16B19/00; F16B19/02; F16B19/04; F16B19/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49579; Y10T29/49826; Y10T29/49833; Y10T29/49835; Y10T29/49908; Y10T29/49925; Y10T29/49934
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
167 words
A method of securing a self-piercing and clinching member to a sheet of metal comprising: positioning at one side of said sheet a self-piercing and clinching member formed of harder material than said sheet and having a shank formed with a leading face, a cutting edge along the margin of said leading face, a first generally cylindrical surface extending axially from said cutting edge, a second cylindrical surface projecting radially outward and axially spaced from said first cylindrical surface and a radially inwardly projecting annular recess axially intermediate said first and second generally cylindrical surfaces; positioning at the opposite side of said sheet a supporting surface having a relieved portion margined by a cooperating shearing edge aligned with said shank; and forcing said member against such sheet causing said cutting edge to shear a blank from said sheet and thereafter causing said second cylindrical portion to forCe material from said sheet into said annular recess and into confining surrounding relation with respect to said first cylindrical surface.
Claim 2
Independent Claim
167 words
A method of securing a self-piercing and clinching member to a sheet of metal comprising: positioning at one side of said sheet a self-piercing and clinching member formed of harder material than said sheet and having a shank formed with a leading face, a cutting edge along the margin of said leading face, a first generally cylindrical surface extending axially from said cutting edge, a second cylindrical surface projecting radially outward and axially spaced from said first cylindrical surface and a radially inwardly projecting annular recess axially intermediate said first and second generally cylindrical surfaces; positioning at the opposite side of said sheet a supporting surface having a relieved portion margined by a cooperating shearing edge aligned with said shank; and forcing said member against such sheet causing said cutting edge to shear a blank from said sheet and thereafter causing said second cylindrical portion to forCe material from said sheet into said annular recess and into confining surrounding relation with respect to said first cylindrical surface.
Claim 3
Dependent Claim
61 words
The method of claim 1 wherein said member presents a radial shoulder adjoining said shank and said shank portion includes a second annular recess axially intermediate said second generally cylindrical surface and said radial shoulder and wherein said member is forced into said sheet to bring said radial shoulder into abutting, substantially coplanar relation with said one side of said sheet.
Claim 4
Dependent Claim
30 words
The method of claim 2 wherein the axial distance from said radial shoulder adjoining said shank to said first generally cylindrical surface is less than the thickness of said sheet.
References Cited (Backward Citations)
US2372485A
Cited
US2691818A
Cited
US2799188A
Cited
GB955813A
Cited
US3186284A
Cited
US3276499A
Cited
US3334406A
Cited
US3443617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |