Patent GB-673078-A (GB)
Abstract: 673,078. Cooking ranges. HOMANN, W., (trading as HOMANN-WERKE W. HOMANN). May 16, 1949 [Oct. 1, 1948], No. 12945/49. Class 126 A coal-fired cooking range has in combination a fire located vertically above an oven, parallel side flues to convey flue gases on each side of the fire and the oven to a flue beneath the oven, a discharge duct consisting of one or two parallel parts directed upwardly near the fire, a valve-controlled opening being provided between the fire and the duct and a space between a casing for the ashpit and fire and the oven casing for decreasing the heat transferred to the oven, which space may be cut off from or connected with the side flues by a hinged cover plate. In one form of the invention the firebox 10 is surrounded by refractory material and provided with a grate 14 below which is an ashbox 15. The casing containing the ashbox 15 is separated from the oven 20 by a heat-insulating chamber 22 which may contain air or insulating material and is provided with pivoted side walls 59 which permit its connection with the side flues which convey flue gases to the flue 25 beneath the oven. Flue gases then pass directly into the discharge duct 27 located centrally at the rear of the firebox 10 and the oven 20. Both the firebox 10 and the chamber beneath the grate 14 are provided with openings into the discharge duct 27 which remain open when continuous combustion is to be maintained and the cooking range is not otherwise in use, the crosssectional area of each opening being sufficient to convey all air leaking through the doors 18, 19 of the range to the discharge duct 27 without passing through the grate 14. When the cooking plates 5, 6 on the oven 20 are to be used the opening between the firebox 10 and the discharge duct 27 may be controlled by a flap 28 operated by a rod 37 which passes from the front of the stove through the opening between the chamber below the grate 14 and the discharge duct 27. The upper end of the discharge duct 27 is provided with openings directed upwardly and to each side, one of which may be connected with the chimney, the others being sealed by covers. The top plate of the range comprises a sheet metal frame 4 provided with cast-iron inserts 5 and a cooking hole cover 6. Side flaps may be provided. In another form of the invention, Figs. 10, 11, two parallel flues are arranged at each side of the firebox 10 and oven. The flues at the front convey flue gases downwardly to beneath the oven and the rear flues convey the flue gases upwardly to a collector 47 behind the ash chamber and thence to a rotatable discharge flue 48 arranged behind the firebox 10. A flap 52 controlling an opening between the firebox 10 and the collector 47 may be pushed open by a projection 61 on a shaft 53 rotated by a handle 54, Fig. 11, projecting from the rear of the range. A downwardly projecting lever 65 attached to the shaft 53 co-operates with a fork 67 attached to a horizontal shaft 69 on which is mounted a shutter 55 which controls an ,opening between the chamber below the grate 14 and the collector 47. By moving the handle 54 into one of three notches 62, 63, 64 at the rear of the range, both the flap 52 and the shutter 55 may close their corresponding openings for maintaining continuous combustion only or the flap 52 may be opened the shutter 55 being either open or closed to enable cooking to proceed. In other respects this form of the invention is similar to that first described.