Patent ID: 6325416
Filing Date: 2001-12-04
Classification: B60R

Abstract:
A belt tensioner comprising a cylinder with an inner shell surface, a piston with a piston head, a working space in said cylinder into which compressed gas enters upon activation of said tensioner to drive said piston, and a traction means attached to said piston and connected with a safety belt, said piston head delimiting said working space and being formed by an annular sealing plate on which an essentially axially extending thin sealing lip is formed, said lip being adapted to resiliently yield radially and contact said inner shell surface of said cylinder in a biased condition, said sealing lip having a free edge which externally has an axially short collar, said collar, engaging said inner shell surface of said cylinder, said collar being partly abraded on introduction of said piston into said cylinder and accordingly adapting itself to said inner shell surface of said cylinder.