Pretensioner

摘要

An object of the invention is to reduce the weight of a pretensioner by reducing the length of a piston and a wire of the pretensioner. A pretensioner (1) is used in a seat belt device and pulls a seat belt. Due to gas supplied into a cylinder (10) from a gas generator (4), a piston (20) is moved in the cylinder (10). A wire (60) is connected to the piston (20) and the seat belt and pulls the seat belt when the piston (20) moves. The wire (60) has both ends that are connected to the seat belt and has a folded portion (63) that is connected to the piston (20) via connecting means (51). The connecting means (51) has a connecting hole (24) that is formed in the piston (20) and through which the folded portion (63) passes and has a detachment preventing member (52) that is positioned between the folded portion (63) and the piston (20) to prevent the folded portion (63) from being detached from the connecting hole (24).

主权项

1. A pretensioner that is used in a vehicle seat belt device and pulls a seat belt, the pretensioner comprising:
a cylinder; a gas generator that supplies gas into the cylinder; a piston that is moved in the cylinder by the gas supplied from the gas generator; a wire that is connected to the piston and the seat belt and pulls the seat belt when the piston moves; and connecting means for connecting the wire to the piston, wherein the wire has both ends that are connected to the seat belt and has a folded portion that is formed between the both ends and is connected to the piston, and the connecting means includes a connecting hole that is formed in the piston and through which the folded portion of the wire passes, and includes a detachment preventing member positioned between the folded portion and the piston to prevent the folded portion from being detached from the connecting hole.