Patent GB-359017-A (GB)
Title: Improvements in or relating to continuous furnaces for the heat treatment of hollow metal articles
IPC: C21D9/08
Filed: 1930-07-14
Abstract: 359,017. Metalheating furnaces. GILLERN, (Geb. POLTE), KATHARINA FREIFRAUV., GILLERN, ARNULF, FREIHERR V., NATHUSIUS, (Geb. POLTE), M., NATHUSIUS, M., (trading as POLTE, [Firm of]), Poltestrasse, and OESTERLIN, I. H., 117A, Halberstadterstrasse, both in Magdeburg, Ger. many. July 14, 1930, No. 21247. [Class 51 (ii).] Relates to the heat treatment of hollow bodies, e.g. cartridge-shells, in a liquid - sealed continuous furnace and consists in passing them through the seal in uniform inclined position so that they fill with liquid completely as they enter the sea] and empty completely on leaving. The case of saltbath heat treatment is included. Fig. 4 illustrates diagrammatically one form of furnace in which the shells are pushed through in trough guides 10, Fig. 5, entering the seal 2a with open ends up and leaving with open ends down. The rear or tail seal may be similar to the entry seal, or, as shown. may take the form of a tank into which the shells drop without regard to position and from which they are removed by any convenient means such as an endless conveyer 12. Figs. 2 and 3 show an alternative furnace conveyer, viz. a chain with lugs 4 of H-section affording shoulders between which the shells 3 are individually supported. Fig. 6 shows an embodiment of the invention in its relation to the shell-drawing machine which precedes the furnace in the manufacturing process. Shells arriving from the distributer 51 slide into the liquid seal down guides 13 to stop points 14, where their open ends are outside the sealing-plate 15, so that displaced air escapes outside the seal. Lifts 170, 17u raise the shells into the sealed furnace entry in line with the treatment passages 7a, 7b into which they are then pushed by pushers 280, 28u. Connections between the parts provide for the appropriately-timed release of the stops 14, tilting of the lifts to empty liquid from the shells and actuation of the pushers. Fig. 17 shows diagrammatically the connections-between the shell-drawing machine and the furnace. Shells from the machine 48 are delivered by, say, two feed tubes 50 to a distributer 51 by which they are aligned with pushers 65 and the. corresponding channels 13 leading to the furnace. The distributer itself, Fig. 22, comprises a pronged bar 55 which is reciprocated both horizontally and vertically in relation to a series of compartments formed by slats 60. In the inclined position of the slats shown the shells arriving from one side are traversed laterally from compartment to compartment till all are filled. Thereupon the slats are swung into a vertical position by cam 73 and rod 62 allowing the shells to drop into channels 64 below. In order to prevent jamming in the feed tubes, an outlet 52, Fig. 20, is formed at a sharp hump in the tube. Normally shells pushed upwardly on one side of the hump tip over on reaching the top into the tube on the other side down which they slide by gravity, but on the down-side becoming full succeeding shells fail to tip and are ejected. All the moving parts are coupled to work in timed relation, but uncoupling is provided for to allow, for instance, the shell-drawing machine to be stopped without interrupting the furnace operation.