Apparatus for making prestressed concrete members
Abstract
Abstract A SYSTEM FOR MANUFACTURING PRESTRESSED CONCRETE MEMBERS COMPRISING A PORTABLE MOLD FOR RECEIVING THE REINFORCING STRAND AND CONCRETE MIX, AND APPARATUS FOR ACCURATELY TENSIONING THE STRANDS IN THE MOLD TO THE DESIRED PRETENSIONING LEVEL. THE PROTABLE MOLD INCLUDES END ASSEMBLIES WHICH INCLUDE MEANS TO RECEIVE AND GRIP THE FREE ENDS OF REINFORCING STRAND EXTENDED THROUGH THE MOLD BODY AND MEANS FOR MAINTAINING THE REINFORCING STRANDS UNDER THE DESIRED PRETENSIONING LOAD AFTER THE STRANDS ARE TENSIONED BY MEANS OF THE STRAND TENSIONING APPARATUS. THE STRAND TENSIONING APPARATUS COMPRISES MEANS TO TENSION THE STRANDS EMPLACED WITHIN THE MOLD BY EITHER MEASURING THE TENSIONING FORCE APPLIED TO THE STRANDS OR BY MEASURING THE ELONGATION OF THE STRANDS RESULTING FROM THE APPLICATION OF A TENSIONING FORCE THERETO.
Inventors
- 👤 William P Hidden
- 👤 Robert S Yetman
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |