Patent US3683740A successfully refreshed from Google Patents.
US3683740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Threaded blind fastener
Assignee: Individual
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Filing: 1971-01-28
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Granted: 1972-08-15
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Expires: 1991-01-28
Abstract
Abstract An anchor with a sleeve and an internally threaded base joined together at a relatively weak joint, which allows the sleeve and base to be separated. External threads on the base and internal threads on the sleeve enable the base to screw into the sleeve when the joint is broken and the base is turned into the sleeve.
Inventors
- 👤 Alan Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:18
CPC Classifications
F; F16; F16B; F16B37/00; F16B37/04; F16B37/06; F16B37/062; F16B37/065; F16B37/067; F16B19/00; F16B19/04; F16B19/08; F16B19/10; F16B29/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
139 words
A blind anchor comprising a circumferentially continuous sleeve, said sleeve having a first end carrying an outwardly extending wall retaining means for gripping a first surface of a wall and a second end constructed and arranged to be located beyond said wall first surface, a base having a body with a tapered portion whose outer diameter increases in a direction away from said sleeve second end and hAving an outer diameter at its end adjacent said sleeve second end substantially equal to the inner diameter of said sleeve at its adjacent end, said base and sleeve being frangibly joined at said sleeve second end, and external threads on the tapered portion of the base adapted to screw into the sleeve as the base is turned into the sleeve to retain the base in the sleeve and expand the sleeve.
Claim 2
Dependent Claim
139 words
A blind anchor comprising a circumferentially continuous sleeve, said sleeve having a first end carrying an outwardly extending wall retaining means for gripping a first surface of a wall and a second end constructed and arranged to be located beyond said wall first surface, a base having a body with a tapered portion whose outer diameter increases in a direction away from said sleeve second end and hAving an outer diameter at its end adjacent said sleeve second end substantially equal to the inner diameter of said sleeve at its adjacent end, said base and sleeve being frangibly joined at said sleeve second end, and external threads on the tapered portion of the base adapted to screw into the sleeve as the base is turned into the sleeve to retain the base in the sleeve and expand the sleeve.
Claim 3
Dependent Claim
35 words
A blind anchor as described in claim 1 further characterized by, said base being frustroconical in shape and internally threaded with internal threads of said base being opposite to said external threads of the base.
Claim 4
Dependent Claim
40 words
A blind anchor as described in claim 2 further characterized by, said sleeve being internally threaded in the same pitch and direction as said external threads on the base so as to enable the base to screw into the sleeve.
Claim 5
Dependent Claim
38 words
A blind anchor as described in claim 2 further characterized by, means provided on the outer surface of the base away from the sleeve for locking the base within the sleeve when it is screwed into the sleeve.
Claim 6
Dependent Claim
36 words
A blind anchor as described in claim 2 further characterized by, an internal shoulder provided on an end of the base adjacent the sleeve and adapted to be engaged by a bit threaded into the base.
Claim 7
Dependent Claim
33 words
A blind anchor as described in claim 2 wherein a closure wall is provided on said base at an end of said base away from said sleeve to close off said internal threads.
Claim 8
Dependent Claim
75 words
A blind anchor in accordance with claim 2 further characterized by, said wall retaining means comprising an outwardly extending flange, an internal shoulder provided by an end of the base adjacent the sleeve and adapted to be engaged by a bit threaded into the base, and said sleeve being internally threaded in the same pitch and direction as said external threads on the base so as to enable the base to screw into the sleeve.
Claim 9
Dependent Claim
48 words
A blind anchor as described in claim 1 further characterized by, said base being coaxially aligned with said sleeve and carrying an outwardly extending stud extending outwardly toward said sleeve first end, said stud being threaded with threads opposite in direction to the external threads on the base.
Claim 10
Dependent Claim
40 words
A blind anchor as described in claim 8 further characterized by, said sleeve being internally threaded in the same pitch and direction as the external threads on the base so as to enable the base to screw into the sleeve.
Claim 11
Dependent Claim
38 words
A blind anchor as described in claim 9 further characterized by, means provided on the outer surface of the base away from the sleeve for locking the base within the sleeve when it is screwed into the sleeve.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |