Patent ID: 7748091

Claim:
A coupling ( 1 ) including a first part ( 2 ) and a second part ( 3 ), where the first part ( 2 ) includes a housing ( 4 ) in which is arranged a displaceable locking ring ( 8 ) with locking means ( 9 ), where the locking ring ( 8 ) in a known way is arranged for receiving and fixing a projecting part ( 5 ) of the second part ( 3 ) which is complementary to the locking ring ( 8 ), where the housing ( 4 ) of said first part in an internal cylindric surface is provided with an annular recess ( 11 ) which is arranged for accommodating the locking means ( 9 ), and where the locking ring ( 8 ) is connected to a spring-biased locking unit ( 17 ) which is arranged for moving and fixing the locking ring ( 8 ) in at least two positions in the housing ( 4 ), wherein the locking unit 17 includes an insert ( 18 ) which at one end is connected to the locking ring ( 8 ), and which at an opposite end is provided with a number of series of, oblique teeth ( 23 ), the insert ( 18 ) having internal and external axial projections ( 24 , 25 ), respectively, a guide ring ( 19 ) surrounding the insert ( 18 ) and having internal axial projections ( 27 ) complementary to the external axial projections ( 25 ), said internal axial projections ( 27 ) being provided with a number of sets of oblique teeth ( 26 ) disposed at one end of said internal axial projections ( 27 ), and a rotor ( 20 ) provided at one end with a number of radial teeth ( 28 ) and at an opposite end provided with a number of stops ( 29 ) that interact with the internal projections ( 24 ) of said rotor, the rotor ( 20 ) is seated internally in the insert ( 18 ) so that the radial teeth ( 28 ) interact with the oblique teeth ( 23 , 26 ) of said insert ( 18 ) and said guide ring ( 19 ).