Dual mode seat belt retractor

Winding – tensioning – or guiding – Strand tensioning device – Tortuous course

Patent

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Details

2421074R, B60R 2240

Patent

active

051199998

ABSTRACT:
A combination seat belt retractor particularly useful for motor vehicles is disclosed. The seat belt retractor according to this invention converts between an emergency locking retractor which locks only when the vehicle is subjected to a deceleration level above a predetermined level to an automatic locking mode wherein the seat belt webbing cannot be withdrawn from the retractor. The convertible feature is particularly advantageous since an emergency locking retractor does not provide the desired firm positioning of child restraint systems. The emergency locking retractor, however, has advantages in terms of occupant comfort and convience since they permit free movement of the occupants within the vehicle. In accordance with this invention, the retractor is converted to the automatic locking mode by first fully withdrawing the seat belt webbing therefrom. Such action causes a switching lever to pivot a cam member in a first direction for biasing a cantilevered spring member against the retractor locking bar. When, however, a predetermined amount of seat belt webbing is returned upon the retractor spool, the cam member is pivoted in a second direction to its normal position, thereby restoring emergency locking operation to the retractor.

REFERENCES:
patent: 4518132 (1985-05-01), Schmidt
patent: 4552319 (1985-11-01), Gavagan et al.
patent: 4566649 (1986-01-01), Petersen
patent: 4573646 (1986-03-01), Willey
patent: 4583701 (1986-04-01), Matsui et al.
patent: 4765558 (1988-08-01), Higbee
patent: 4967977 (1990-11-01), Gavagan et al.

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