Patent ID: 8186489

Claim:
A pull arrangement ( 51 ) with a tension spring ( 53 ) and a spring reversing structure ( 71 ) around which the tension spring at least partially extends, the arrangement including: a tension spring ( 53 ) with an overall spring stroke of at least 50% of the nominal length (the length of the relaxed spring), the tension spring ( 53 ) having at least an area ( 56 ) of high spring stiffness and another area ( 57 ) of lower spring stiffness, the area ( 56 ) of high spring stiffness extending around the reversing structure ( 71 ) and in the area ( 56 ) of high spring stiffness, a quotient of the medium reversing or redirecting radius ( 6 ) and the differential stroke of the outer spring area ( 59 ) and the inner spring area ( 58 ) per spring winding ( 62 ) being greater than 50.