Patent ID: 7923667

Claim:
A floor-mounted electric room heater, the electric room heater comprising: a housing defining an enclosed space, the housing having a plurality of blinds extending along the housing for permitting heated air to exit the housing; a plurality of heaters connected in series, each of the heaters having a generally vertical central axis, being located within the housing in spaced apart relation, each including: a plurality of concentric insulating holder sets, each of the sets having a plurality of insulating holders radially spaced from the central axis, each of the insulating holders having a radial dimension and a plurality of vertically spaced apart teeth extending radially outward, each of the teeth having a vertical dimension, the plurality of concentric insulating holder sets defining a first insulating holder set adjacent to the central axis and a second insulating holder set radially outward from, spaced apart and adjacent to the insulating holders of the first insulating holder set; and a heating element formed of cold rolled sheet and having a rectangular cross-section, the heating element being helically and successively wound between the teeth of the first insulating holder set and then the teeth of the second insulating holder set to form a plurality of generally concentric rings and vertically stacked layers of heating element, wherein the radial dimension and the vertical dimension maintain radial and vertical clearances between the generally concentric rings and vertically stacked layers; a supporting frame rigidly securing the housing and the heaters; and a plurality of support legs extending from the support frame to provide spacing between the heaters and the floor.