US3597781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-tapping threaded bushings
Assignee: EIBES CARL H
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Filing: 1968-05-31
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Granted: 1971-08-10
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Expires: 1988-05-31
Abstract
Abstract The disclosure relates to a threaded bushing which, upon entering and turning in the initially smooth bore of the work piece, will form through its own male thread the corresponding internal thread within the wall of the work piece bore. The bushing is formed with one or more exterior bevels or grooves which extend axially over at least several threads and intersect such threads to form blade or cup-shaped frontal areas where each bevel or groove merges into a respective thread.
Inventors
- 👤 Carl B H Eibes
- 👤 Christian Eibes
- 👤 Carl-Herwig Eibes
- 👤 Maria-Theresia Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:27
CPC Classifications
F; F16; F16B; F16B37/00; F16B37/12; F16B37/122; B; B21; B21H; B21H3/00; B21H3/02; B21H3/027; B23; B23G; B23G7/00; Y; Y10; Y10S; Y10S411/00; Y10S411/924; Y10S411/929; Y10S411/938
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
A process for the manufacture of threaded self-tapping bushings comprising, forming on the exterior of a generally cylindrical bushing member at least one axially extending groove which extends over at least a part of the length of said bushing member, rolling a male thread by means of rolling tools onto the exterior of said bushing member, in said thread rolling step deforming the crest of each said male thread at its intersection with each said bevel both along the circumferential direction of said thread and transversely thereto along the axial direction of the bushing to form spoonshaped frontal areas having upstanding edges which deform the thread of the workpiece into which said bushing is turned.
Claim 2
Dependent Claim
115 words
A process for the manufacture of threaded self-tapping bushings comprising, forming on the exterior of a generally cylindrical bushing member at least one axially extending groove which extends over at least a part of the length of said bushing member, rolling a male thread by means of rolling tools onto the exterior of said bushing member, in said thread rolling step deforming the crest of each said male thread at its intersection with each said bevel both along the circumferential direction of said thread and transversely thereto along the axial direction of the bushing to form spoonshaped frontal areas having upstanding edges which deform the thread of the workpiece into which said bushing is turned.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the axially extending grooves are formed on the bushing member by drawing.
Claim 4
Dependent Claim
26 words
The process according to claim 1 in which the direction of thread rolling corresponds to the direction of turning of the threaded bushing into the workpiece.
Claim 5
Dependent Claim
26 words
The process of claim 1 in which the direction of thread rolling is opposite to the direction of turning of the threaded bushing into the workpiece.
Claim 6
Dependent Claim
22 words
The process according to claim 1 in which the threaded bushing is made of steel and is tempered after said thread-rolling step.
Claim 7
Dependent Claim
24 words
The process according to claim 1 in which the starting material comprises pieces of bushing length cut from stock material of circular cross section.
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |