Patent ID: 9103405
Filing Date: 2015-08-11
Classification: F16B,F16G

Abstract:
1. Tensioning device ( 1 ) for chains with a spindle body ( 2 ) which is provided with at least one spindle thread ( 11 ), with at least two coupling elements ( 3 , 4 ) that are connected to the spindle body ( 2 ), wherein at least one coupling element ( 3 , 4 ) comprises a coupling thread ( 3 b , 4 b ) screwed to the spindle thread ( 11 ), and with a securing element ( 5 ) which can be transferred from a release position, in which the coupling thread ( 3 b , 4 b ) can be rotated with respect to the spindle thread ( 11 ), to a securing position, in which a rotation of the coupling thread ( 3 b , 4 b ) with respect to the spindle body ( 2 ) is blocked in a form-fitting manner, wherein the securing element ( 5 ) creates a positive rigid body coupling between the at least one coupling element ( 3 , 4 ) provided with a coupling thread ( 3 b , 4 b ) and the spindle body ( 2 ) in the securing position, wherein the securing element ( 5 ) is, in the release position, arranged on said at least one coupling element ( 3 , 4 ) or the spindle body such that it is torsionally rigid and movable in a longitudinal direction (L), wherein the securing element ( 5 ) comprises at least one positive locking element ( 14 ) which, in the securing position, is positively engaged with a complementary embodied positive locking element ( 10 ) of the spindle body ( 2 ) or the at least one coupling element, said positive locking element ( 14 ) of said securing element ( 5 ) and said positive locking element ( 10 ) of said spindle body ( 2 ) or the at least one coupling element being configured so as to prevent any rotational movement of said at least one coupling element relative to said spindle body in said securing position, wherein the securing element ( 5 ) and/or the spindle body ( 2 ) or the at least one coupling element comprise at least one retaining magnet ( 5 d ) which connects the securing element ( 5 ) and the spindle body ( 2 ) or the at least one coupling element by a magnetic holding force in the securing position.