Seat belt retractor with energy management

Details Seat belt retractor with energy management Seat belt retractor with energy management

1996-10-10

1998-10-20

Dickson, Paul N.

Land vehicles

Wheeled

Attachment

297476, 297472, 188375, 2423791, B60R 2228

Patent

active

058235701

ABSTRACT:
A spool sleeve (78) is rotatable in webbing withdrawal and webbing retraction directions (A, B). A lock pawl (122) engageable with a ratchet wheel (114), stops rotation of the spool sleeve (78) in the webbing withdrawal direction (A). The spool sleeve (78) is rotatable relative to the ratchet wheel (114) upon the occurrence of tension in webbing (16) above a predetermined amount. A cutter (94) is located radially within the spool sleeve (78) for cutting the spool sleeve (78) when the spool sleeve (78) rotates relative to the stopped ratchet wheel (114). In one preferred embodiment, the cutter (220) includes a portion (226) which is inclined with respect to a plane perpendicular to a rotational axis (164) of the spool sleeve (192) to cause the cutter (220) to move axially relative to the spool sleeve. In another preferred embodiment, the spool sleeve (284, 286) is comprised of a plurality of pieces fitted together to extend around the axis (164). In another preferred embodiment, the rotation of the spool sleeve (396, 398) is resisted and the amount of resistance can be changed. Two cutters (472, 510) provide different amounts of resistance when they cut the spool sleeve (396, 398).

REFERENCES:
patent: 3632060 (1972-01-01), Balder
patent: 3666198 (1972-05-01), Neumann
patent: 3881667 (1975-05-01), Tandetzke
patent: 3952967 (1976-04-01), Barile et al.
patent: 4273361 (1981-06-01), Takei et al.
patent: 5613647 (1997-03-01), Dybro et al.

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