Abstract: This invention relates to a helmet with an air filtering device and in particular to one which utilizes a meter to drive a fan so as to suck in air and transmit the air through a filtering device which divides the air into two streams respectfully supplied to the head and nose of an user on one hand and exhausts the exhaled air out of the helmet through a plurality of check valve, thereby enabling the user to inhale cleaned air.

Abstract: This invention relates to a nose mask with a filtering device and in particular to one including a resilient clamp adapted to be worn on a head of an user, a mask adapted to a nose of an user and having an inlet pipe and an exhaust pipe, and a filter connected with one side of the resilient clamp and being driven by a dc motor. The filter is provided with an outlet connected with the inlet pipe of the mask via a flexible pipe and an inlet through which air may be sucked in from outside whereby when in use, air will be filtered and transmitted to the mask through the flexible pipe and the inlet pipe thereby enabling the user to inhale cleaned air while air exhaled by the user will be exhausted out of the exhaust pipe of the mask.

Abstract: This invention relates to a mask with an air filtering device and in particular to one including a helmet adapted to a head of a user, a visor pivotally connected with a lower side of the helmet and having a soft pad for preventing air entering therein from outside, a filtering chamber having a blower driven by a dc motor and a filtering plate mounted between the blower and a cover of the filtering chamber, a pipe connected at one end with an outlet of the blower and extending at the other to space around mouth and nose of the user, a curved air guider for converging cleaned air into the space around the mouth and nose of the user and a check valve mounted on the soft pad for exhausting air exhaled by the user.

Abstract: The present invention is to provide a kind of first-aid gas mask, which uses an air filter to filtrates toxic gas and to further let the well filtrated gas be delivered to the transparent cover around the mouse and nose of the user for inhalation, which transparent cover is having an elastic band made on the bottom opening for fastening, through which bottom opening the exhalation is exhausted. This invention is easy to operate and practical for use in first-aid and, more particularly for use in emergent case during fire or pit disaster so as to help the user to escape with one's life.