Patent ID: 8820346

Claim:
A self-actuating drainage device for placement on a structure to drain water accumulated on the structure, comprising: a collection funnel having a bottom with a funnel hole extending therethrough; a siphon conduit contiguous with said funnel hole, said siphon conduit having a collection conduit at one end disposed on the structure and a drainage conduit at least partially disposed on the structure with an opposite end of said drainage conduit disposed at a position lower than said collection conduit, wherein said collection conduit and said drainage conduit are maintained in substantially the same planar orientation with one another; and a valve mechanism comprising a stopper positionable in said funnel hole, a float maintained within said collection funnel, a link connecting said float to said stopper, a stem extending from said float, a support bracket having a stem hole therethrough that slidably receives said stem, a float bias mechanism secured to said support bracket and having a pivotable lever arm movable by said stem, said pivotable lever arm biased by a magnet, wherein said valve mechanism opens when accumulated water raises said float and said stem so as to overcome a biasing force exerted by said magnet on said stem so that the water collected in said collection funnel is released through both said collection and drainage conduits and starts a siphoning action from said collection conduit to said opposite end of said drainage conduit.