초록 ▼

Individual electrically heated mats, self-regulated by use of an electrical element whose resistance varies proportionately with its temperature, used for covering walking areas to prevent accumulation of snow and ice. Each mat is provided with male and female electrical connections on the ends of s

Individual electrically heated mats, self-regulated by use of an electrical element whose resistance varies proportionately with its temperature, used for covering walking areas to prevent accumulation of snow and ice. Each mat is provided with male and female electrical connections on the ends of short power cords to permit any number of mats to be chained together in electrical parallel and to be used to cover, for example, a flight of stairs by positioning one mat on each stair.

대표청구항 ▼

A heating mat for preventing the accumulation of snow or ice on a walkway comprising: a flat flexible mat casing having upper and lower surfaces, a flexible heating strip sealed within said casing, a first flexible electric cord entering an edge of the casing near a first side thereof and generally

A heating mat for preventing the accumulation of snow or ice on a walkway comprising: a flat flexible mat casing having upper and lower surfaces, a flexible heating strip sealed within said casing, a first flexible electric cord entering an edge of the casing near a first side thereof and generally coplanar with the mat at said edge, a second electric cord entering the edge of the mat near an opposite side thereof, said cords being electrically connected to each other and to only one end of said heating strip within the mat casing, said first cord having a male electric plug thereon for connecting the heating strip to a source of power, said second cord having a female connector for connection to an electric plug like said male electric plug, the length of said second cord being less than the height of the riser of one stair step so that the female connector hangs above the next lower walkway surface when the mat is positioned on a walkway step.