GB114618A - A Process for Enamelling Metal Articles and an Improved Arrangement of Furnace therefor. - Google Patents

Abstract

114,618. Dupont, P. March 30, 1917, [Convention date]. Enamelling-furnaces; metal-heating furnaces.- A furnace for enamelling articles by the powder. ing process comprises a wall A of very porous refractory material, of the general shape of the article, e.g., a bath B, supported within a metal casing C by projections d, leaving a space e for the circulation of the combustible mixture which is supplied through pipes D and is ignited by burners E. Extensions c of the casing C support the edge b of the bath. The furnace is provided with a flat cover also provided with a porous lining A, but with non-porous refractory pieces K at the angles to protect the edges b. The furnace is mounted upon a suitable double support so that ib can be tilted longitudinally and transversely to facilitate the powdering operation. Waste gases escape by passages F and may be used for preheating the mixture or for heating a stove for preheating the articles. In operation, the article previously heated in the stove is transferred to the furnace and raised to the proper temperature which is ascertained through a mica-covered sighthole in the cover. The cover is then raised by a windlass &c. and the powder applied, the heat of the furnace being meanwhile maintained. Fig. 2 shows a modification of the furnace in which the wall A is reduced in thickness, leaving a larger space e into which open a series of burners L. The refractory material A may be porous or not and may be reinforced by a metal plate. The Specification as open to inspection under Sect. 91 (3) (a) states that the furnace is applicable to the heating of metal articles in general, steamgenerators, &c. This subject-matter does not appear in the Specification as accepted.