Back to results
US 4,302,979 AGranted
Means and techniques useful in stressing cable
OwnerMaximiliaan J. Dykmansinventor
Life of this patent
Estimating the term…
Abstract
A permanent recording is made of the force applied to a prestressing element such as a steel cable as well as its resulting elongation in the process of taking up its slack and in subsequently tensioning and locking off the cable in its final stressed condition, such recording being particularly useful in establishing actual values of stress and strain along a cable length inside of a tube which is in frictional engagement with the cable.
Claims21
A system for prestressing a cable and continuously sensing and recording the force applied to, the axial movement of, and the elongation of the cable comprising:
- a first means for releasably engaging the cable,
- a power operated member operatively associated with said means for engaging the cable such that said member is capable of exerting prestressing force on the cable,
- recording means having a recording element and a first and second control element which determine the character of the recording made by the recording element,
- said member being capable of moving said cable in an axial direction and of elongating said cable,
- a second means for releasably engaging said cable and for preventing substantial loss of the tensile stress applied to the cable by the member when said first means for engaging said cable is disengaged,
- means for sensing axial movement and elongation of the cable operatively connected to said first control element,
- means for sensing the force applied to said cable by said member operatively connected to said second control element,
- said control elements being capable of controlling said recording element in response to said sensing means to produce a simultaneous and continuous record in said recording means of the axial movement of, elongation of, and force applied to the cable.
5 more elements
A system for prestressing a cable and continuously sensing and recording the force applied to, the axial movement of, and the elongation of the cable comprising:
- a first means for releasably engaging the cable,
- a power operated member operatively associated with said means for engaging the cable such that said member is capable of exerting prestressing force on the cable,
- recording means having a recording element and a first and second control element which determine the character of the recording made by the recording element,
- said member being capable of moving said cable in an axial direction and of elongating said cable,
- a second means for releasably engaging said cable and for preventing substantial loss of the tensile stress applied to the cable by the member when said first means for engaging said cable is disengaged,
- means for sensing axial movement and elongation of the cable operatively connected to said first control element,
- means for sensing the force applied to said cable by said member operatively connected to said second control element,
- said control elements being capable of controlling said recording element in response to said sensing means to produce a simultaneous and continuous record in said recording means of the axial movement of, elongation of, and force applied to the cable,
- wherein the means for sensing force is located between said power operated member and said first means for engaging the cable.
6 more elements
A system for prestressing a cable and continuously sensing and recording the force applied to, the axial movement of, and the elongation of the cable comprising:
- a first means for releasably engaging the cable,
- a power operated member operatively associated with said means for engaging the cable such that said member is capable of exerting prestressing force on the cable,
- recording means having a recording element and a first and second control element which determine the character of the recording made by the recording element,
- said member being capable of moving said cable in an axial direction and of elongating said cable,
- a second means for releasably engaging said cable and for preventing substantial loss of the tensile stress applied to the cable by the member when said first means for engaging said cable is disengaged,
- means for sensing axial movement and elongation of the cable operatively connected to said first control element,
- means for sensing the force applied to said cable by said member operatively connected to said second control element,
- said control elements being capable of controlling said recording element in response to said sensing means to produce a simultaneous and continuous record in said recording means of the axial movement of, elongation of, and force applied to the cable,
- wherein said means for sensing force is located between said power operated member and said first means for engaging the cable.
6 more elements
A system for prestressing a cable and continuously sensing and recording the force applied to, the axial movement of, and the elongation of the cable comprising:
- a first means for releasably engaging the cable,
- a power operated member operatively associated with said means for engaging the cable such that said member is capable of exerting prestressing force on the cable,
- recording means having a recording element and a first and second control element which determine the character of the recording made by the recording element,
- said member being capable of moving said cable in an axial direction and of elongating said cable,
- a second means for releasably engaging said cable and for preventing substantial loss of the tensile stress applied to the cable by the member when said first means for engaging said cable is disengaged,
- means for sensing axial movement and elongation of the cable operatively connected to said first control element,
- means for sensing the force applied to said cable by said member operatively connected to said second control element,
- said control elements being capable of controlling said recording element in response to said sensing means to produce a simultaneous and continuous record in said recording means of the axial movement of, elongation of, and force applied to the cable,
- wherein said power operated member is a piston movable in a cylinder and a stationary jack stand is provided for said cylinder, said means for sensing force being positioned between said jack stand and said cylinder.
6 more elements
A system for prestressing a cable and continuously sensing and recording the force applied to, the axial movement of, and the elongation of the cable comprising
- a first clamping means for releasably clamping the cable,
- a power operated member operatively associated with said first clamping means such that said member is capable of exerting prestressing force on the cable,
- recording means having a recording element and a first and second control element which determine the character of the recording made by the recording element,
- said member being capable of moving said cable in an axial direction and of elongating said cable,
- a second clamping means for releasably engaging said cable and for preventing substantial loss of the tensile stress applied to the cable by the member when said first clamping means is disengaged,
- an elongation transducer for sensing axial movement and elongation of the cable operatively connected to said first control element,
- a load cell for sensing the force applied to said cable by said member operatively connected to said second control element,
- said control elements being capable of controlling said recording element in response to said sensing means to produce a simultaneous and continuous record in said recording means of the axial movement of, elongation of, and force applied to the cable.
5 more elements
Dependencies are inferred from the claim text.