Tension device for prestressing an assembly by means of a threaded rod, and method for assembling the tension device

Patent metadata

Field	Value
Publication number	US-9375815-B2
Application number	US-201313950871-A
Country	US
Kind code	B2
Filing date	Jul 25, 2013
Priority date	Jul 25, 2012
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

Device for tensioning a threaded rod comprising an actuator able to exert an axial tensile force on the threaded rod with respect to a structure to be tensioned, the said tension device comprising a cylinder, a piston, a tubular skirt in contact with the cylinder and a surface of the said structure to be tensioned, and a tie for transmitting the axial tensile force of the actuator towards an end of the threaded rod. The tie and the tubular skirt each comprise at least two semicylindrical parts each having two substantially planar axial surfaces, the two axial surfaces of one semicylindrical part being joined radially respectively with one of the two axial surfaces of the other semicylindrical part, so as to form a part of revolution.

First claim

The invention claimed is:

1. A tension device for tensioning a threaded rod, the tension device comprising:
an actuator able to exert an axial tensile force on the threaded rod with respect to a structure to be tensioned, said actuator comprising:
a cylinder,
a piston,
a tubular skirt in contact with the cylinder and
a surface of the said structure to be tensioned, and
a tie for transmitting the axial tensile force of the actuator towards an end of the threaded rod,
wherein the tie and the tubular skirt each comprise at least two semicylindrical parts, each of the at least two semicylindrical parts having two substantially planar axial surfaces, wherein the two axial surfaces of one semicylindrical part is joined radially respectively with one of the two axial surfaces of the other semicylindrical part, so as to form a part of revolution.

2. The tension device according to claim 1 , the tubular skirt further comprising a means for spacing the two semicylindrical skirt parts and a means for fixing the two semicylindrical skirt parts.

3. The tension device according to claim 2 , wherein the means for centring the two skirt parts includes spacing screws screwed into each of the planar axial surfaces of one of the skirt parts and is intended to come into planar contact with the planar axial surfaces of the other skirt part.

4. The tension device according to claim 1 , wherein the means for fixing the two skirt parts includes an element made of magnetized material fixed on each of the planar axial surfaces of one of the skirt parts and is intended to come into planar contact with the planar axial surfaces of the other skirt part.

5. The tension device according to claim 4 , wherein the element made of magnetized material includes magnetized washers, the magnetized washers being housed in a counterbore made in each of the planar axial surfaces of one of the skirt parts and is fixed on the said skirt part using the fixing means.

6. The tension device according to claim 5 , wherein the fixing means includes fixing screws, wherein the magnetized washers are affixed onto the planar axial surfaces of the corresponding skirt part by fixing screws.

7. The tension device according to claim 1 , in which the tie comprises a means for aligning the two semicylindrical tie parts and a means for fixing the two semicylindrical tie parts.

8. The tension device according to claim 7 , wherein the means for aligning two tie parts includes pins arranged in holes of a corresponding shape made in each of the tie parts,
wherein the pins are perpendicular to the junction surfaces and the centring screws are screwed into each of the planar axial surfaces of one of the tie parts and are placed into planar contact with the planar axial surfaces of the other tie part.

9. The tension device according to claim 7 , wherein the means for fixing the two tie parts includes a fixing ring surrounding the tie and is secured onto the tie using securing means.

10. The tension device according to claim 9 , wherein the fixing ring is maintained in position around the tie by cylindrical pins housed in a counterbore made in each of the junction surfaces of the two tie parts.

11. A method for assembling a tension device comprising steps of:
obtaining the tension device, the tension device comprising:
an actuator able to exert an axial tensile force on the threaded rod with respect to a structure to be tensioned, said actuator comprising:
a cylinder,
a piston,
a tubular skirt in contact with the cylinder and
a surface of the said structure to be tensioned, and
a tie for transmitting the axial tensile force of the actuator towards an end of the threaded rod,
wherein the tie and the tubular skirt each comprise at least two semicylindrical parts, each of the at least two semicylindrical parts having two substantially planar axial surfaces, wherein the two axial surfaces of one semicylindrical part is joined radially respectively with one of the two axial surfaces of the other semicylindrical part, so as to form a part of revolution;

mounting the cylinder and the piston axially on the threaded rod to be prestressed by assembling the two semicylindrical parts of the skirt radially around the around the threaded rod.

12. The method for assembling a tension device according to claim 11 , further comprising a step of clipping a fixing ring onto the tie.

13. The method for assembling a tension device according to claim 12 , further comprising, following the step of assembling the two skirt parts around the threaded rod, a step of:
moving the assembly formed by the cylinder and the piston, the two semicylindrical tie parts and the fixing ring axially towards the surface of the structure to be tensioned.

Assignees

• Skf Ab

Inventors

• Faus Jose
• Declerck Didier

Classifications

• B25B29/02

  Bolt tensioners · CPC title

• Y10T29/49826

  Assembling or joining · CPC title

• B23P19/067 Primary

  Bolt tensioners (for hand tools B25B29/02) · CPC title