Smoke-proof mask

Claim 1

A smoke-proof mask comprising; a body having an open side to be worn on a face surface to cover a nose, a mouth and a chin of a wearer so as to prevent smoke from flowing therein through a contacting line, an interior hollow divided into an upper chamber and a lower chamber, a hole in the upper portion of the upper chamber for fixing an exhaling valve therein; an exhaling valve fixed in the hole in the body consisting of a cylindrical upper cap bored with small outlet holes, a sliding member deposited in the upper cap to slide up and down therein and having a plurality of vertical ridges to contact an inner wall of the upper cap to form the same number of passageways as that of the ridges between the upper cap and the sliding member, and a base with a central through hole passing through and being kept in the hole in the body from underneath to insert in the upper cap securely; an oxygen chamber formed in the lower portion of the body under the lower chamber, divided by several separating vertical plates and several small holes provided in an upper separating wall to communicate with the lower chamber in the body and an inlet tap fixed to extend out of a bottom for a tube to fit therewith for connecting with a small oxygen tank; and said inlet tap receiving oxygen through the tube from a small oxygen tank, said oxygen flowing into the oxygen chamber and having its pressure lowered and being stored therein temporarily and then being inhaled up through the small holes of the oxygen chamber by inhaling action through a mouth of a wearer to go up into the lower chamber to be inhaled into a wearer's body, exhaled air out of the nose flowing into the upper chamber and then passing through the central hole in the base of the exhaling valve, said sliding member being pushed by the exhaled air to slide up to open the central hole of the base, letting the exhaled air pass through the passageways between the sliding member and the upper cap and finally through the small outlet holes of the upper cap out into open air, said sliding member falling down to block the central hole of the base to prevent open air for flowing into the upper chamber through the exhaling valve during inhaling action of the mouth of the wearer of the mask.