US3659321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple wedge anchorage device for prestressing tendons
Assignee: SOC TECHNIQUE POUR L'UTILISATION de la PRECONTRAINTE
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Filing: 1970-06-12
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Granted: 1972-05-02
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Expires: 1990-06-12
Abstract
Abstract The units of a prestressing cable made of multiple parallel tendon units are individually clamped between two wedges of a crown of wedges clamping all the units being itself located in a frusto-conical hole of a bearing part of which the apex angle is greater than 15*.
Inventors
- 👤 Michel Laurent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:14
CPC Classifications
E; E04; E04C; E04C5/00; E04C5/08; E04C5/12; E04C5/122; Y; Y10; Y10T; Y10T403/00; Y10T403/38; Y10T403/70; Y10T403/7047; Y10T403/7051; Y10T403/7052; Y10T403/7054
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
177 words
An anchorage device for prestressing a plurality of similarly shaped units, comprising, a flat bearing block having a frustoconical opening therein, the wall of said opening being greater than 15* with respect to the axis of said block; a plurality of similar sector-shaped wedges equal to the number of said units having, in gathered active condition, a first frusto-conical outer surface engaging said wall of said opening, and a second frusto conical surface, said surfaces defining an apex, the slope of said second surface being greater than the slope of said first surface, the distance parallel to said block axis between said apex and the end of said first surface slope being greater than the distance parallel to said block axis between said apex and the end of said second surface slope, the slope of said first frusto-conical outer surface being slightly greater than the shape of said block opening, and a pair of adjoining ones of said wedges each having, in their opposing radial plane faces, a facing groove for accommodating one of said tendon units.
Claim 2
Dependent Claim
177 words
An anchorage device for prestressing a plurality of similarly shaped units, comprising, a flat bearing block having a frustoconical opening therein, the wall of said opening being greater than 15* with respect to the axis of said block; a plurality of similar sector-shaped wedges equal to the number of said units having, in gathered active condition, a first frusto-conical outer surface engaging said wall of said opening, and a second frusto conical surface, said surfaces defining an apex, the slope of said second surface being greater than the slope of said first surface, the distance parallel to said block axis between said apex and the end of said first surface slope being greater than the distance parallel to said block axis between said apex and the end of said second surface slope, the slope of said first frusto-conical outer surface being slightly greater than the shape of said block opening, and a pair of adjoining ones of said wedges each having, in their opposing radial plane faces, a facing groove for accommodating one of said tendon units.
Claim 3
Dependent Claim
74 words
An anchorage device according to claim 1 wherein said distance between said apex and the end of said second surface slope is about half the said distance between said apex and the end of said first surface slope, and wherein, in active condition, a perpendicular to said first frusto-conical surface midway along the length thereof passes through the outer plane face of said block substantially in the same location as said one tendon unit.
Claim 4
Dependent Claim
24 words
An anchorage device according to claim 1 wherein said grooves are straight and, in operative condition, are parallel to the axis of said block.
References Cited (Backward Citations)
US3123879A
Cited
US2009318A
Cited
GB845386A
Cited
GB1020432A
Cited
CH430135A
Cited
FR1430406A
Cited
US3449876A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |