Suction Roof Drain

Abstract

The suction flat roof drain is deployed on a flat roof between a water accumulating depression on the roof and the edge of the roof. The flat roof drain includes an intake tube section with an open end disposed in the flat roof depression and a raised tube element spaced apart from the open end. The intake tube section is attached, at an end opposite the open end, to a water collector which collects rainfall. The water collector has an open accumulation port, a water collection body part and a one-way flow valve. The one-way flow valve is interposed between the water collection body part and an intake suction port and an output port. The output port of the water collector is attached to one end of an output tube section. The other end of the output tube section hangs over the edge of the roof (or into another drain element). The second or other end of the output tube section operates as a weight activated fluid output which permits water to drain therefrom when water is present at the second end. In operation, rainfall collected in the water collector and causes the one-way flow valve to open which then causes the water in the water collection body to drain through the output tube section off the roof thereby creating a suction in the intake tube section which pulls water from the flat roof depression.

1 . A suction flat roof drain wherein the flat roof has a water accumulating depression thereon comprising:
 an intake tube section with an open end disposed in said flat roof depression, said intake tube section having a raised tube element spaced apart from said open end, and an outlet opposite said open end;   a water collector for collecting rainfall, said water collector having an open accumulation port for collecting said rainfall, a water collection body part which accumulates said rainfall captured by said accumulation port, said water collection body part defining a predetermined volume of water, and said water collector including a one-way flow valve interposed between said water collection body part and a fluidly coupled intake suction port and a fluidly coupled output port, wherein when rainfall is collected by said water collector in said water collection body part, said valve opens; and   an output tube section having a first end fluidly coupled to said output port of said water collector and having a second end which operates as weight activated fluid output for said flat roof drain such that when water is present at said second end of said output tube section, fluid flows first from said water collector and then from said flat roof depression by suction.   
   
   
       2 . The suction flat roof drain as claimed in  claim 1  including a stand for said raised tube element of said intake tube, said stand interposed between said intake tube section and said flat roof. 
   
   
       3 . The suction flat roof drain as claimed in  claim 1  wherein said one-way flow valve is a buoyant ball which sits on a valve seat adjacent said fluidly coupled intake suction port and said fluidly coupled output port in the absence of rainfall is collected by said water collector in said water collection body part. 
   
   
       4 . The suction flat roof drain as claimed in  claim 1  wherein said predetermined volume of water in said water collection body part exceeds a volume of accumulated water in said water accumulating depression of said flat roof. 
   
   
       5 . The suction flat roof drain as claimed in  claim 1  wherein said output tube section has a terminal end tube section which has a high degree of flexibility as compared with a degree of flexibility of a remainder portion of said output tube section, said remainder portion of said output tube section fluidly coupled to said output port of said water collector and said terminal end tube section flexing downward when said water is present thereat. 
   
   
       6 . The suction flat roof drain as claimed in  claim 2  wherein said one-way flow valve is a buoyant ball which sits on a valve seat adjacent said fluidly coupled intake suction port and said fluidly coupled output port in the absence of rainfall is collected by said water collector in said water collection body part. 
   
   
       7 . The suction flat roof drain as claimed in  claim 6  wherein said predetermined volume of water in said water collection body part exceeds a volume of accumulated water in said water accumulating depression of said flat roof. 
   
   
       8 . The suction flat roof drain as claimed in  claim 7  wherein said output tube section has a terminal end tube section which has a high degree of flexibility as compared with a degree of flexibility of a remainder portion of said output tube section, said remainder portion of said output tube section fluidly coupled to said output port of said water collector and said terminal end tube section flexing downward when said water is present thereat. 
   
   
       9 . The suction flat roof drain as claimed in  claim 1  wherein said raised tube element is a tube loop. 
   
   
       10 . The suction flat roof drain as claimed in  claim 1  wherein said output tube section is coupled to a spring element to facilitate drainage and return to a pre-drain, elevated condition.