Patent ID: 6250683
Filing Date: 2001-06-26
Classification: B60R

Abstract:
A belt tensioner, comprising:a belt buckle unit provided with a belt buckle and a traction transfer means,a tensioner drive;said traction transfer means connecting said belt buckle with said tensioner drive and displacing said belt buckle in a tensioning direction on activation of said tensioner drive, andat least one positive connection between said belt buckle unit and said tensioner drive, which in the non-activated state of said tensioner drive largely prevents at least one of a rotation and an axial displacement of said belt buckle unit with respect to said tensioner drive,wherein said tensioner drive comprises a housing and said positive connection is provided between said belt buckle unit and said housing,wherein said tensioner drive is a piston/cylinder unit with a cylinder and a piston within said cylinder, wherein said positive connection is provided between said piston and said cylinder, wherein said piston is coupled with said traction transfer means, and wherein said cylinder forms said housing,wherein said cylinder has an end wall through which said traction transfer means extends, and wherein said end wall is formed at least partially by a seal which engages on said traction transfer means,wherein said positive connection is formed by a positive fit between seal and piston, andwherein said piston and said seal are connected with each other by at least one projection which engages into a groove.