Roof drain

Abstract

A flat roof structure having a recess with a surrounding area in which is mounted a drain for evacuating standing water on the flat roof. The drain including a housing extending upwardly and outwardly from the flat roof, a sump extending downwardly and inside the flat roof, a liquid pump for draining the water collected from the flat roof, a discharge line connected to the liquid pump and being located in the sump of the drain. The discharge line passing through one of the four walls of the sump, thus allowing it to extend under the flat roof and inside the building. The drain also including a heating element for keeping the standing water collected in the sump in a substantially liquid state within the drain so as to allow continuous discharging of the collected standing water even in sub-zero weather conditions.

1 . A flat roof structure having a recess with a surrounding area in which is mounted a drain to evacuate water, said drain comprising 
 a quadrilateral housing having four walls and a top, each of the wall comprising a top portion and a lower portion, the lower portion being perforated, said housing protruding upwardly and outwardly from the flat roof,    a sump beneath the perforated portion of the housing, the sump having four walls coplanar with each corresponding wall of the housing, said sump being extending downwardly inside the recess of the flat roof,    attaching means for securing the housing to the sump,    an outwardly projecting collar means mounted above the sump for securing the housing in sealing arrangement within the surrounding area of the recess whereby water on the flat roof enters the sump through the perforated lower portion of the housing,    a liquid pump located in the drain for evacuating water collected from the flat roof, said liquid pump having an inlet positioned to admit the water accumulated in the bottom of the sump and an outlet located in the sump of the drain, and    a heating element for keeping the standing water collected in the sump in a substantially liquid state within the drain so to allow continuous discharging of the collected standing water even in sub-zero weather conditions, and    a discharge line having one end connected to the outlet of a liquid pump for evacuating the standing water collected in the sump,    the improvement wherein the discharge line connected to the outlet of the pump located in the sump passes through one of the four walls of said sump and extends inside building under the flat roof.    
     
     
         2 . A flat roof structure according to  claim 1 , wherein the heating means is a heating wire.  
     
     
         3 . A flat roof structure according to  claim 1 , comprising activation means to switch on the heating element in sub-zero temperatures.  
     
     
         4 . A flat roof structure according to  claim 1 , wherein the attaching means comprises four threaded rods and nuts respectively mounted on the four corners of the housing.  
     
     
         5 . A flat roof structure according to  claim 1 , further comprising an electric plug on one of the walls of the housing for providing electric power to the liquid pump and the heating element.  
     
     
         6 . A flat roof structure having a recess with a surrounding area in which is mounted a drain to evacuate water, said drain comprising 
 a quadrilateral housing having four walls and a top, each of the wall comprising a top portion and a lower portion, the lower portion being perforated, said housing protruding upwardly and outwardly from the flat roof,    a sump beneath the perforated portion of the housing, the sump having four walls coplanar with each corresponding wall of the housing, said sump being extending downwardly inside the recess of the flat roof,    attaching means for securing the housing to the sump, the attaching means comprising four threaded rods and nuts respectively mounted on the four corners of the housing,    an outwardly projecting collar means mounted above the sump for securing the housing in sealing arrangement within the surrounding area of the recess whereby water on the flat roof enters the sump through the perforated lower portion of the housing,    a liquid pump located in the drain for evacuating water collected from the flat roof, said liquid pump having an inlet positioned to admit the water accumulated in the bottom of the sump and an outlet located in the sump of the drain,    activation means to switch on the heating element in sub-zero degree celsius temperature,    a heating element for keeping the standing water collected in the sump in a substantially liquid state within the drain so to allow continuous discharging of the collected standing water even in sub-zero weather conditions, the heating element comprising a heating wire,    an electric plug on one of the walls of the housing for providing electric power to the liquid pump and the heating element, and    a discharge line having one end connected to the outlet of a liquid pump for evacuating the standing water collected in the sump,    the improvement wherein the discharge line connected to the outlet of the pump located in the sump passes through one of the four walls of said sump and extends inside building under the flat roof.