Plant watering device

Claim 1

A repeatedly operating watering device, comprising: a water reservoir; said water reservoir defining a first air-tight space within an upper portion of said reservoir; means defining an outlet at the bottom of said water reservoir for the outflow of water from said water reservoir; a first water receptacle for receiving flows of water from said water reservoir; and means for controlling the flows of water from said water reservoir through said outlet to said first water receptacle; said water flow controlling means comprising: means defining a second air space disposed below said first air space and adjacent said first receptacle; means providing communication between said second air space and the atmosphere; means defining an air passage having a top end in said first air-tight space and a bottom end in said second air space; and means providing communication between said first water receptacle and said second air space at a predetermined level, whereby said passage bottom end is immersed to prevent flow of the water from said water reservoir to said first water receptacle until evaporation of water from said second air space allows the entry of air through said air passage to said first air space and, thus, a flow of water from said water reservoir to said first water receptacle; a second receptacle for receiving water from said first receptacle; and weir means between said first and second receptacles for allowing filling of said second receptacle with water from said first receptacle, said weir means retaining water in said first receptacle to prevent the entry of air through said opening during consumption of the water in said second receptacle.