Patent ID: 8832869

Claim:
A helmet massager comprising: a helmet, the helmet comprising: a first helmet body, wherein the first helmet body comprises a first left helmet body and a first right helmet body which are butt jointed, the first left helmet body and the first right helmet body respectively have a first left butt-joint end and a first right butt- joint end, the first left butt-joint end and the first right butt-joint end respectively have a first left rack and a first right rack; and an adjusting device, the adjusting device comprising a base, a gear, a ratchet body with ratchet teeth, and a knob for driving the ratchet body to rotate, wherein the base is located at a butt-joint site of the first left helmet body and the first right helmet body, each of the first left rack and the first right rack engages with the gear, the ratchet body is positioned on the gear, the knob is mounted on the ratchet body, the base has a ring of locking teeth, the ratchet body has a rotating state and a rest state, when the ratchet body is in the rest state, the ratchet teeth engage with the locking teeth, and when the ratchet body is in the rotating state, the ratchet teeth are disengaged from the locking teeth, and the gear is formed with a snapping groove at a side facing the ratchet body, the ratchet body is provided with a snapping post at a side facing the gear, and the snapping post is snap-fitted into the snapping groove.