Patent ID: 7802318

Claim:
A helmet, comprising: a helmet body; a cooling fan device mounted in the helmet body to introduce an ambient air into the helmet body; wherein the cooling fan device includes: a support base removably mounted on the helmet body; a cooling fan mounted on the support base; a battery mounted on the support base and connected to the cooling fan to provide an electric power to the cooling fan; and a control switch mounted on the support base and connected to the cooling fan and the battery to control operation of the cooling fan; wherein the helmet body has an upper end formed with a vent hole, and the support base has a planar bottom plate formed with an opening connected to the fan holder and the vent hole of the helmet body to align the cooling fan with the vent hole of the helmet body to introduce the ambient air from the fan holder through the vent hole of the helmet body into the helmet body by rotation of the cooling fan; wherein the upper end of the helmet body is formed with two locking slots each having a first end formed with an entrance hole, a second end formed with a locking hole having a diameter smaller than that of the entrance hole, and a mediate portion formed with a guide hole located between the entrance hole and the locking hole and formed on a connection of the entrance hole and the locking hole, and the bottom plate of the support base is formed with two outwardly extending locking tenons each inserted into and movable in the respective locking slot of the helmet body and each having a distal end formed with an enlarged locking head passed through the entrance hole and the guide hole of the respective locking slot and detachably locked in the locking hole of the respective locking slot.