Winding – tensioning – or guiding – Strand tensioning device – Tortuous course
Patent
1986-12-12
1988-03-08
Jillions, John M.
Winding, tensioning, or guiding
Strand tensioning device
Tortuous course
2421074A, 188 74, 188161, B60R 2238, B60R 2240
Patent
active
047295252
ABSTRACT:
A seat belt retractor comprises a spool which is rotatable in seat belt winding and unwinding directions. An inertia member is rotatable with the spool at spool accelerations below a predetermined level and rotatable relative to the spool at spool accelerations above the predetermined level. The spool is blocked against from rotation in the unwinding direction in response to relative rotation of the inertia member and the spool. The inertia member is restrained from rotation to effect rotation relative to the spool by an electromagnet having opposite poles extending adjacent the inertia member. The electromagnet is energized to create a magnetic field extending through the poles to cause the poles to be attracted against the inertia member to restrain rotation of the inertia member.
REFERENCES:
patent: 2588837 (1952-03-01), Holm
patent: 2600685 (1952-06-01), Perinoni et al.
patent: 2687546 (1954-08-01), Oppenheimer
patent: 3339681 (1967-09-01), Holladay
patent: 3343763 (1967-09-01), Spouge
patent: 3552676 (1971-01-01), Weber
patent: 3825205 (1974-07-01), Takada
patent: 3967794 (1976-07-01), Fohl
patent: 3995787 (1976-12-01), Takada
Jillions John M.
TRW Vehicle Safety Systems Inc.
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