US3755880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tensioning devices
Assignee: Individual
•
Filing: 1971-10-21
•
Granted: 1973-09-04
•
Expires: 1991-10-21
Abstract
Abstract A method for tensioning cables embedded in concrete, including fluid actuated units, cable gripping members, jacking means and a de-tensioning assembly permitting to cut off the excess portion of the cable without danger to personel and equipment.
Inventors
- 👤 J Simms
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:44
CPC Classifications
E; E04; E04G; E04G21/00; E04G21/12; E04G21/121; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49874
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
110 words
A method of tensioning a cable strand extending through a casting bed of any length, using a driving unit, chuck means including a cap and jaws for gripping the cable strand, a jacking chair, and de-tensioning means including a spacer element and a release plunger, wherein the same spacer element and release plunger may be used for any length of casting bed, said method comprising the steps of mounting the spacer element upon the release plunger and placing both intermediate the chuck means and the end wall of the casting bed, and jacking the fluid actuated driving unit against the jacking chair for tensioning the cable to a desired degree.
Claim 2
Independent Claim
110 words
A method of tensioning a cable strand extending through a casting bed of any length, using a driving unit, chuck means including a cap and jaws for gripping the cable strand, a jacking chair, and de-tensioning means including a spacer element and a release plunger, wherein the same spacer element and release plunger may be used for any length of casting bed, said method comprising the steps of mounting the spacer element upon the release plunger and placing both intermediate the chuck means and the end wall of the casting bed, and jacking the fluid actuated driving unit against the jacking chair for tensioning the cable to a desired degree.
Claim 3
Dependent Claim
29 words
The method as set forth in claim 1, including the steps of a further slight tensioning of the cable whereby the spacer is rendered loose and may be removed.
Claim 4
Dependent Claim
44 words
The method as set forth in claim 2, including the step of removing the spacer, whereby the release plunger is removed towards the chuck means cuasing it to release the strand, such that the strand may be cut without danger of snapping or coiling.
Claim 5
Dependent Claim
24 words
The method as set forth in claim 3, wherein the further slight tensioning of the cable is done to the original degree of tension.
Claim 6
Dependent Claim
22 words
The method as set forth in claim 4, including the step of loosening the chuck cap prior to positioning the jacking chair.
Claim 7
Dependent Claim
21 words
The method as set forth in claim 5, including the step of applying micro mesh graphite as a chuck releasing agent.
Claim 8
Independent Claim
180 words
A method of tensioning a cable strand extending through a casting bed using a driving unit, chuck means including a cap and jaws for gripping the cable strand, a jacking chair, and de-tensioning means including a spacer element and a release plunger, said method comprising the steps of providing a metal sheath tubing around the cable strand within the casting bed, inserting a small tube into the metal tubing with the end of the small tube slightly protruding from the metal tubing, clamping the metal tubing over the small tube as by a wire ring, positioning a bearing plate in a void at the end of the bed perpendicular to the small tube and joining the plate to the tube as by welding, placing the spacer element over the cable strand in front of the bearing plate, mounting the chuck means over the cable strand in front of the spacer element, tensioning the cable strand, grouting within the metal sheath tubing, tensioning the cable strand additionally, removing the chuck means and the spacer element, and filling the void with cement.
Claim 9
Independent Claim
180 words
A method of tensioning a cable strand extending through a casting bed using a driving unit, chuck means including a cap and jaws for gripping the cable strand, a jacking chair, and de-tensioning means including a spacer element and a release plunger, said method comprising the steps of providing a metal sheath tubing around the cable strand within the casting bed, inserting a small tube into the metal tubing with the end of the small tube slightly protruding from the metal tubing, clamping the metal tubing over the small tube as by a wire ring, positioning a bearing plate in a void at the end of the bed perpendicular to the small tube and joining the plate to the tube as by welding, placing the spacer element over the cable strand in front of the bearing plate, mounting the chuck means over the cable strand in front of the spacer element, tensioning the cable strand, grouting within the metal sheath tubing, tensioning the cable strand additionally, removing the chuck means and the spacer element, and filling the void with cement.
Claim 10
Dependent Claim
39 words
The method as set forth in claim 7, including the step of welding the cable strand to the bearing plate subsequent to removal of the chuck means and the spacer element and prior to filLing the void with cement.
References Cited (Backward Citations)
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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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |