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A dual spool pretensioner serving dual spool retractors in a common frame by transversely projecting a piston element between the adjacent shaft extensions. The shaft extensions are upset as by knurling and a portion of the piston element is in an interference path with the upset portion of the shaf

A dual spool pretensioner serving dual spool retractors in a common frame by transversely projecting a piston element between the adjacent shaft extensions. The shaft extensions are upset as by knurling and a portion of the piston element is in an interference path with the upset portion of the shafts. The piston is cartridge driven by pyrotechnic means and the portion of the piston means, in the guided interference path with the upset, is deformed during passage between the shafts so that the shafts and the reels attached thereto are positively rotated and webbing on such reels is wound thereon. The pretensioner is removably attached by its case to the retractor frame and stresses in the pretensioner are thereby transmitted through the retractor frame to the mounting thereof.

대표청구항 ▼

A pretensioner for turning the spools to tighten webbing thereon for dual spool safety belt retractors comprising: a pair of shafts in spaced-apart parallel offset relation, each of said shafts each driving a webbing spool connected thereto and each having a knurled section intermediate the ends the

A pretensioner for turning the spools to tighten webbing thereon for dual spool safety belt retractors comprising: a pair of shafts in spaced-apart parallel offset relation, each of said shafts each driving a webbing spool connected thereto and each having a knurled section intermediate the ends thereof; a case supporting said shafts for operative journalling and location therein of said knurled sections, said case attachable to a dual spool retractor frame; a chamber in said case; a pyrotechnic means removably inserted in said chamber; and deformable piston means operably engaged against said chamber and alignably journalled between said shafts and having an interference fit with said knurled sections whereby, upon linear movement of said piston, said piston means is deformed and said shafts are rotated, turning said spools and tensioning said webbing.