Patent US3762027A successfully refreshed from Google Patents.
US3762027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of post-tensioning prestressed concrete
Assignee: RELIABLE POWER PRODUCTS Inc A CORP OF DE(FKA) MACLEAN-FOGG ACQUISITION Co
•
Filing: 1970-05-18
•
Granted: 1973-10-02
•
Expires: 1990-05-18
Abstract
Abstract A pre-cut length of cable and a dead anchor are preassembled and inspected to provide a cable and dead anchor assembly for shipment to the job site. The assembly apparatus is a frame having a slot in one end wall to receive the assembly and a hydraulic cylinder having a tubular ram which pushes the jaw cluster of the anchor into the anchor shell to develop a permanent wedging engagement of the jaw cluster, cable and shell. The push force applied is less than that at which tooth deformation would occur which would cause material reduction of the holding power of the anchor during a later cable tensioning operation. After inspection of the jaw set, a cap is placed over the large end of the shell to prevent entry of the concrete mix.
Inventors
- 👤 F Burtelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:01
CPC Classifications
E; E04; E04G; E04G21/00; E04G21/12; E04C; E04C5/00; E04C5/08; E04C5/12; E04C5/122; F; F16; F16B; F16B2200/00; F16B2200/10; Y; Y10; Y10T; Y10T24/00; Y10T24/39; Y10T24/3996; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49874; Y10T29/49945; Y10T403/00; Y10T403/70; Y10T403/7047; Y10T403/7051; Y10T403/7052; Y10T403/7054; Y10T403/7062; Y10T403/7064
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
134 words
In the method of post-tensioning concrete slabs or the like which involves the use of a jacketed cable having a dead anchor end with a jaw cluster in a shell, and a live anchor end, and which includes the step of applying a tension to the live anchor end of the cable after the concrete has set so as to develop a tension stress in the cable between the dead anchor and the live anchor, the step of preassembling, before applying tension to the live anchor, the cable and the dead anchor, and applying a force to the rear end of the jaw cluster of said dead anchor in such direction and of a magnitude sufficient to develop a permanent wedging engagement of the jaw cluster, cable and the shell of the dead anchor.
Claim 2
Dependent Claim
134 words
In the method of post-tensioning concrete slabs or the like which involves the use of a jacketed cable having a dead anchor end with a jaw cluster in a shell, and a live anchor end, and which includes the step of applying a tension to the live anchor end of the cable after the concrete has set so as to develop a tension stress in the cable between the dead anchor and the live anchor, the step of preassembling, before applying tension to the live anchor, the cable and the dead anchor, and applying a force to the rear end of the jaw cluster of said dead anchor in such direction and of a magnitude sufficient to develop a permanent wedging engagement of the jaw cluster, cable and the shell of the dead anchor.
Claim 3
Dependent Claim
42 words
The method as claimed in claim 1 in which the force applied to said jaw cluster is less than that at which tooth deformation of the jaw teeth causes material reduction of the holding power of said anchor during said tensioning step.
Claim 4
Dependent Claim
21 words
The method as claimed in claim 1 in which said force applied to said jaw cluster is less than 8,000 pounds.
Claim 5
Dependent Claim
26 words
The method as claimed in claim 1 in which said force is less than 24 percent of the said tension force applied during said tensioning step.
Claim 6
Dependent Claim
86 words
In the method for anchoring the dead anchor end of a post-tensioning cable in concrete and wherein said anchor has a jaw cluster and a shell, the step of assembling one end of the cable with a dead anchor, and applying a push force to the rear end of the jaw cluster of said dead anchor sufficient to develop a permanent wedging engagement of the jaw cluster, cable, and the shell of the dead anchor, and subsequently installing the anchor as part of a post-tensioning apparatus.
Claim 7
Dependent Claim
86 words
In the method for anchoring the dead anchor end of a post-tensioning cable in concrete and wherein said anchor has a jaw cluster and a shell, the step of assembling one end of the cable with a dead anchor, and applying a push force to the rear end of the jaw cluster of said dead anchor sufficient to develop a permanent wedging engagement of the jaw cluster, cable, and the shell of the dead anchor, and subsequently installing the anchor as part of a post-tensioning apparatus.
Claim 8
Dependent Claim
30 words
The method as claimed in claim 5 in which the push force applied to said jaw cluster is less than that at which tooth deformation of the jaw teeth occurs.
Claim 9
Dependent Claim
22 words
The method as claimed in claim 5 in which the push force applied to said jaw cluster is less than 8,000 pounds.
Claim 10
Dependent Claim
26 words
The method as claimed in claim 5 in which the push force is less than 19 percent of the rated minimum ultimate strength of said cable.
References Cited (Backward Citations)
US206321A
Cited
US2755657A
Cited
US2871554A
Cited
US3029490A
Cited
US2834081A
Cited
US2869214A
Cited
US3058386A
Cited
US3225499A
Cited
US3163904A
Cited
US3596330A
Cited
US3399434A
Cited
US3491431A
Cited
US3597830A
Cited
US3616517A
Cited
US3579931A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |