ELECTRIC TYPE INITIATOR AND PRETENSIONER

The present invention provides an electric type initiator which can secure reliability at a time of activation thereof and can be easily manufactured. The electric type initiator includes a priming 7 to be ignited by a bridge wire 3 generating heat and a cavity 5 for storing the priming. The cavity 5 is formed in a cylindrical shape and its opening end 42 is closed by a cover member 6. The cover member 6 is formed separately from a peripheral wall portion 4 for forming the cavity. Further, the present invention provides an initiator assembly which can be used for any seat belt pretensioner system activated by a gas generated from a gas generator and that can be easily manufactured. The initiator assembly includes an electric type initiator and a collar member. A cavity for storing the priming of the electric type initiator is defined inside a metallic cap member which is in a cylindrical shape with a top and engaged with the header member.