Improvements in and connected with electric heating resistances and elements

Abstract

Abstract 286,807. Norris Warming Co., Ltd., and Booth, L. A. Dec. 18, 1926. Electric radiators and warmers.-An electric heating resistance made of hard drawn nickel chromium alloy and adapted to be operated at a black heat, is wound on a strip, bar, rod or tube of mica, fireclay &c., and enclosed between sheets of mica or the like. A suitable alloy consists of nickel 16.8 per cent, silver 5 per cent, chromium 30 per cent, copper 36.95 per cent, iron 4 per cent, zinc 3.77 per cent, lead 2.9 per cent and tin 0.58 per cent. The wire B may be wound on one or more sheets of mica A with notched edges, the wire being substantially on one face of the sheets as shown in Fig. 2, or the wire may be wound round both sides of the sheets. The wound sheets are enclosed between other sheets which are secured together by paper clips G. The unit thus formed, or two or more connected together, is placed in a metal tray and covered with a sheet J of polished aluminium, over which is placed an asbestos sheet K and a metal cover plate L carrying a box M furnished with connections. Such a heater may be arranged in a panel, wall, ceiling &c., or may be placed in a grate, in which case a glow may be obtained from coloured strip lights fitted in a canopy or hood, or a coloured lamp behind transparent imitation fuel. The heater may also be mounted horizontally on wheels and with its height adjustable, in which case it may be used as a food-warmer or wheeled under beds to warm and air them. The heater may also be arranged to radiate heat from both sides of a portable screen.

Inventors

No inventors recorded.

Bibliographic Details