Importance

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Abstract

A pretensioner comprises a pyrotechnic force generating device including a horizontal tube with a propellent charged cartridge, a housing receiving one end of the cylinder with the horizontal tube being supported to cooperate with the force generating device in order to reverse-rotate the reel; a force transmitting portion including an arm positioned in a first chamber of the housing, one end of which is directed to the piston in the cylinder and the other end of which is extended out of the cylinder, a pulley rotatably mounted on the other branched end of the arm and a cable fixed at one end to the housing, passed through the pulley, wound around the clutch disk and fixed at the other end to the clutch disk; and a pretensioner positioned in a second chamber, which comprises the clutch disk and a clutch portion, in which the clutch disk includes a circular groove formed around the periphery thereof to allow a length of the cable to be wound thereon, a plurality of second coupling projections each having a right-angled surface toward one direction and a slanted surface toward the other direction, at least three of coupling grooves cut out at one side in a right-angle and at the other side in a slant angle and a first fixing groove formed to fix the other end of the cable, and the clutch portion includes at least three of first coupling projections forming a slanted surface at one side and a right-angled surface at other side for cooperating with the coupling grooves and a plurality of third coupling projections or concaved grooves formed at the positions facing to the second coupling projections on one side surface of the reel.

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First Claim