US3866510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-tapping threaded bushings
Assignee: EIBES CARL H
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Filing: 1973-02-05
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Granted: 1975-02-18
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Expires: 1993-02-05
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 spoon 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-Theresi Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:18
CPC Classifications
F; F16; F16B; F16B37/00; F16B37/12; F16B37/122; B; B21; B21H; B21H3/00; B21H3/02; B21H3/027; B23; B23G; B23G7/00; F16B25/00; F16B25/001; F16B25/0031; F16B25/0036; F16B25/0042; F16B25/0052
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
192 words
A threaded self-tapping bushing adapted to be secured to a workpiece and comprising, an elongate member having helical male threads extending over at least a portion of its axial length said threads having crests, roots between said crEsts, and flanks extending from said crests to said roots on either side of said crests; said member having at least one axially extending bevel intersecting a plurality of successive threads, the crests and flanks of each said male thread at their intersection with said bevel defining frontal areas on either side of said bevel which are concave both along the circumferential direction of each said male thread and transversely thereto along the axial direction of the bushing, each said bevel being approximately as deep as the roots between the crests to ensure that the roots between successive crests are essentially discontinuous at each bevelled portion, each said frontal area providing cutting edges along at least a part of its periphery as defined by said crest, flanks, and bevel, one of the two said frontal areas formed at the junction of each said male thread with said bevel having a greater curvature than the other.
Claim 2
Dependent Claim
192 words
A threaded self-tapping bushing adapted to be secured to a workpiece and comprising, an elongate member having helical male threads extending over at least a portion of its axial length said threads having crests, roots between said crEsts, and flanks extending from said crests to said roots on either side of said crests; said member having at least one axially extending bevel intersecting a plurality of successive threads, the crests and flanks of each said male thread at their intersection with said bevel defining frontal areas on either side of said bevel which are concave both along the circumferential direction of each said male thread and transversely thereto along the axial direction of the bushing, each said bevel being approximately as deep as the roots between the crests to ensure that the roots between successive crests are essentially discontinuous at each bevelled portion, each said frontal area providing cutting edges along at least a part of its periphery as defined by said crest, flanks, and bevel, one of the two said frontal areas formed at the junction of each said male thread with said bevel having a greater curvature than the other.
Claim 3
Dependent Claim
31 words
The threaded bushing of claim 1 in which the leading frontal area in the direction of turning said bushing into said work piece has less curvature than the lagging frontal area.
Claim 4
Dependent Claim
25 words
The threaded bushing of claim 1 in which the beveled male thread profiles at at least one end of the bushing are conically tapered inwardly.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |