Fire monitors

Claim 1

A fire monitor for projecting water comprising: an outer tube having an upstream end communicating with water inlet means and a downstream and closed by a baffle plate; an inner tube located radially within and coaxial with the outer tube, said inner tube having an open end located adjacent to and spaced from said baffle plate; an outlet nozzle connected to a downstream end of said inner tube and extending coaxially therefrom; said inner tube having an outer surface which is substantially constant in diameter, and said outer tube having an inner surface which is substantially constant in diameter and is spaced from said outer surface of said inner tube thereby defining a channel therebetween, whereby water flows from said inlet means through said channel, strikes said baffle plate and is deflected into said open end of said inner tube to flow towards said outlet nozzle; said inner tube having an inner surface and said open end of said inner tube is rounded to provide a continuous surface between said inner and outer surfaces of said inner tube; said inner surface of said inner tube having a continuous surface defined by a gradual increase in the cross-section of said inner tube from said rounded open end over a portion of said predetermined length and a gradual decrease in cross-section for the remainder of said predetermined length; said baffle plate having a surface which faces said open end of said inner tube, said facing surfaces having a curved periphery corresponding to the rounded open end of said inner tube and a continuous flat surface extending over the entire remaining area of said facing surface, whereby a semi-toroidal bend is provided at said downstream end of said outer tube and said open end of said inner tube to minimize turbulence in the water flow from said channel into said inner tube; and said outer tube has an outer surface which has a substantially constant diameter to permit said outlet nozzle to be deflected through a wide range of angles without obstruction.