Patent ID: 9744656
Date: 2017-08-29
CPC Classifications: B23P,B25B,F16B

Claim:
1. A clamping device for expanding a threaded bolt by pulling on the threaded end portion (A) thereof, the clamping device comprising: a support pipe ( 2 ) which is supported as an abutment against an underlay ( 8 ) which surrounds the threaded bolt; a cylindrical housing ( 1 ) which is arranged in extension of the support pipe ( 2 ) and which has at least one piston ( 5 ) which can be moved therein in the longitudinal direction and which can be connected to a hydraulic supply line; a changeable bushing ( 10 ) which is constructed so as to be able to be axially carried by the piston ( 5 ) and which, for screwing to the threaded end portion (A) of the threaded bolt, is provided with an inner thread ( 11 ) and, for axial carrying by the piston ( 5 ), is provided with a radially expanded portion ( 25 ); a resilient arrangement ( 15 ) arranged around the changeable bushing ( 10 ) and acting axially on the piston ( 5 ); and a lid which is secured to the cylindrical housing ( 1 ); wherein the lid is of a two-part construction comprising a lid base member ( 40 ) and a closure lid ( 41 ), wherein the lid base member ( 40 ) is securely connected to the cylindrical housing ( 1 ) and has a top end with an annular radial collar projecting inwardly and having a radial inner rim defining an opening ( 48 ) of the lid base member ( 40 ), wherein a lower side of the annular radial collar forms the other support ( 47 ) of the resilient arrangement, wherein the closure lid ( 41 ) is removably secured in the opening ( 48 ) whose radial extent (W 3 ) is greater than the radial extent (W 1 ) of the radially expanded portion ( 25 ) of the changeable bushing ( 10 ), wherein, when the closure lid ( 41 ) is removed, the changeable bushing ( 10 ) is removable through the opening ( 48 ) from the clamping device and the resilient arrangement ( 15 ) remains supported at the annular radial collar.