Definition of inertia reel in US English:

inertia reel


  • A reel device which allows a vehicle seat belt to unwind freely but which locks under force of impact or rapid deceleration.

    • ‘It was fitted with three inertia reel three-point (lap and diagonal) belts.’
    • ‘With the inertia reel belts used in cars nowadays, it is vital to ensure the belt is pulled very, very tightly around the seat to ensure it stays tight and the seat cannot wobble.’
    • ‘It was a modern inertia reel type of seat belt system.’
    • ‘Further injuries resulted from harness webbing stretch, failure of harness inertia reels and what researchers term the human body's ‘jelly-like’ extrusion through harness restraints.’
    • ‘Six airbags, five 3-point inertia reel seatbelts, an energy absorbing side impact protection system, a ring of steel surrounding the car and high strength steel beams at front and rear are standard.’


inertia reel

/iˈnərSHə ˌrēl//ɪˈnərʃə ˌril/