The application discloses an
aviation seat headrest
assembly and a small-angle adjusting and resetting method thereof. The
assembly comprises a headrest, a headrest plate, a headrest rod, a rotating rod, an angle adjusting mechanism and a resetting mechanism. The angle adjusting mechanism is composed of a coaxially fixed
ratchet wheel, a pawl and a tension spring, and can be unidirectionally locked in a range of -17° to +15° with a step of 2°±0.1°. The small
rotating disc of the resetting mechanism is provided with a boss. When the headrest plate is forward rotated to +15° and then pushed by ≤5°, the boss pushes and presses the
tail part of the pawl, and the pawl is unlocked within 0.3s, and the headrest plate is one-time over-reset to -17° after the hand is released. All the parts are made of 7075-T6 aluminum
alloy and
flame-retardant plastic, and the total weight is ≤450g. The
ratchet wheel has 90 teeth, a modulus of 0.333 mm and a single-tooth meshing
coincidence degree of ≥1.05, and satisfies the HIC relative 5° step reduction of ≥25% under the
impact of CCAR-25.56. The application considers small-step fine support, one-hand one-key resetting, light weight and high reliability, and is suitable for batch installation of
cockpit and passenger cabin seats.