Patent ID: 9623524
Date: 2017-04-18
CPC Classifications: B23P,B25B

Claim:
1. A tensioning device for expanding a threaded bolt by a pull on a threaded end portion of the threaded bolt, the tensioning device comprising: a supporting tube surrounding the threaded end portion and surrounding a nut screwed onto the threaded end portion; a cylinder arranged in a prolongation of the supporting tube; at least one piston disposed in the cylinder and moveable in the cylinder axially in a direction of a longitudinal mid-axis of the piston; a hydraulic supply operatively connectable to the at least one piston; an interchangeable bush adapted to be screwed to the threaded end portion and adapted to be driven axially by the at least one piston; a gear arrangement for adjusting the nut; the gear arrangement comprising a driver element adapted to engage externally on the nut and further comprising a drive shaft provided with an engagement structure for a drive tool; wherein an axis of rotation of the drive shaft is arranged at an angle of more than 0° and less than 180° relative to the longitudinal mid-axis of the at least one piston; wherein the axis of rotation extends tangentially and at a distance relative to the longitudinal mid-axis of the at least one piston.