1. Field of the Invention
The invention relates to air tanks and more particularly to a portable air tank having improved airtight characteristics.
2. Description of Related Art
A conventional portable air tank for paintball guns, bicycles, motorcycles, and automobiles is shown in
The rim 53 is a thin member and liable to bend or even break. Thus, the fastening of the communication member 60 is not reliable. Moreover, the sealing ring 70 is structurally strong to prevent the compressed air from passing its surface. Thus, air leakage may occur after a short period of time of use.
Thus, the need for improvement still exists.
It is therefore one object of the invention to provide a portable air tank comprising a reservoir including a space for containing compressed air, an upper neck, a channel through the neck, internal threads on a surface of the channel, external threads on an outer surface of the neck, and an annular bottom in the channel; a communication member in the channel and including a stem, a tunnel in the stem, and an annular member on a bottom of the stem and rested on the bottom; a sealing ring rested on the annular member; and a cap including an axial hole for receiving the stem, external threads secured to the internal threads to urge the annular member against the bottom, and a top handle member.
The above and other objects, features and advantages of the invention will become apparent from the following detailed description taken with the accompanying drawings.
Referring to
In use, a person may use a pointed member to pierce the thin top of the stem 21. As a result, compressed air in the reservoir 10 exits via the tunnel 22.
While the invention has been described in terms of preferred embodiments, those skilled in the art will recognize that the invention can be practiced with modifications within the spirit and scope of the appended claims.