Physics – Moving About
The Inertia Reel Safety belt was designed to reduce the effect of a vehicle collision in respect to Newton’s First Law of Motion: “An object will continue in a state of rest, or uniform motion in a straight line at constant velocity, unless an unbalanced external force causes it to change that state.”
Inertia reel seatbelts have cylinders located at the base of seat belts, which contain extra belt material rolled on a spool. The spool turns freely during normal driving, keeping the shoulder belt loose so your upper body can move relatively freely and comfortably. When a collision occurs, or the velocity of the car is suddenly changed, a pendulum inside the reel is propelled forward, locking the spool and thus locking the belt, restricting further extension of the seatbelt, thus the occupant is prevented from being flung and is restrained (as seen in Figures 1 & 2).
When the belt is pulled slowly, the toothed plate is not in contact with the clutch. When the belt is pulled suddenly, the toothed plate is pulled onto the clutch (as seen in figure 1).
The Lap Seat Belt, (as seen in Figure 4), only reaches across the Hip/Lap area. In a crash, this lap belt does not extend, all it does is restrict movement, and this is not good.
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