초록 ▼

A tensioner for a safety belt has a piston/cylinder unit, which comprises a cylinder and a piston arranged in its interior, a compressed gas source, on the activation of which the piston is displaced, a belt engagement device which engages the safety belt, a traction cable which connects the piston

A tensioner for a safety belt has a piston/cylinder unit, which comprises a cylinder and a piston arranged in its interior, a compressed gas source, on the activation of which the piston is displaced, a belt engagement device which engages the safety belt, a traction cable which connects the piston to the belt engagement device, and at least one dampener for the absorption of energy on deceleration of the movement of the belt engagement device. The cylinder has a first end nearer to the belt engagement device and a second end further away therefrom. The piston consists of at least two piston parts, namely of a first, radially outer piston part and a second, radially inner piston part, the second piston part being uncoupled from the first piston part on deceleration of the piston at the end of the tensioning process.

대표청구항 ▼

[ What is claimed is:] [1.]1. A tensioner for a safety belt comprising:a cylinder including a cylinder jacket defining an interior of said cylinder;a piston arranged in said interior of said cylinder; anda compressed gas source, activation of said compressed gas source initiating a tensioning proces

[ What is claimed is:] [1.]1. A tensioner for a safety belt comprising:a cylinder including a cylinder jacket defining an interior of said cylinder;a piston arranged in said interior of said cylinder; anda compressed gas source, activation of said compressed gas source initiating a tensioning process by displacing said piston in said cylinder in a tensioning direction;a belt engagement means;a traction transfer means connecting said piston to said belt engagement means; andat least one dampening means to absorb energy upon deceleration of said belt engagement means;said cylinder having a first end nearer to said belt engagement means and a second end spaced further away from said belt engagement means,said piston including a first, radially outer piston part and a second, radially inner piston part, said first and second piston parts being coupled together when moving in the tensioning directionsaid first piston part and said second piston part being designed in a way that said second piston part moves in the tensioning direction relative to said first piston part and becomes uncoupled and spaced apart from said first piston part upon deceleration of said piston at the end of said tensioning process resulting in said first and said second piston parts being distanced from each other in said tensioning direction.