Patent ID: 8721104

Claim:
A hat comprising: a crown; a bill extending forward from the crown and comprising a front recess and a rear cavity communicating with the recess; a lamp assembly comprising a seat releasably secured to both the recess and the cavity, the seat including a front recessed portion, two side wings, two opposite holes through the wings respectively, two gears each formed around a portion of a circular inner surface of the hole, two guide grooves each formed on an outer surface of the wing, and two projections at both ends of a rear end respectively wherein the guide grooves are slidably secured onto both sides of the recess and the projections are fitted in both ends of the cavity respectively; a mounting unit disposed in the recessed portion of the seat and including a receptacle and two hollow cylinders extending laterally to dispose in the holes respectively, each cylinder communicating with the receptacle and having a lengthwise protrusion on an outer surface, the protrusion being in gear engagement with the corresponding gear so as to allow the mounting unit to pivot about the seat in a predetermined angular range; and a lamp unit releasably secured to the mounting unit and including a plurality of light emitting members; and a power supply electrically connected to the light emitting members.