Patent GB-627246-A (GB)
Title: Improvements in or relating to smoke or pyrotechnic signalling devices
IPC: F42B4/26
Filed: 1945-12-13
Abstract: 627,246. Smoke-producing device and composition. DWYER, M. Dec. 13, 1945, No. 33759. [Class 81(i)] [Also in Group XXI] A coloured smoke or flare-signalling device of the type which is held in the hand while burning is provided with means for heat insulating an inner container 19, holding the smoke or flare compound, from an outer container 10 and with removable means for sealing hermetically the outer container. Furthermore, removal of the sealing means of the outer container initiates means therein for igniting the signalling compound. In the upper end of the cylindrical container 10 is fitted a spacer member 11 having an opening 12. A cover 14 fits within the upper part 11b of the spacer 11 and the upper edges of the cover 14 and of the container 10 are beaded together and may be made leak-proof by soldering. An opening 16 in the cover 14 is sealed by a tear strip 17 which may be soldered into the opening and may be removed by pulling a ring 18. The inner container 19 holding a smoke-producing compound C has at its upper end a reentrant cover 22 in which is a central opening 23 and additional openings 24 for the escape of the products of combustion. A reduced portion 11a of the spacer 11 fits within the cover 22 and so centres the container 19 with respect to the outer container 10. The inner surfaces of both containers may be treated with a lacquer with heat - insulating properties. The smoke compound C may consist of Dye 69.2 per cent, Sucrose 14.2 per cent, Potassium Chlorate 16.2 per cent and Halowax Oil 1,000 0.4 per cent, all parts being by weight. The dye used may be H. V. Orange B. A fuze 27 extends through the compound C terminating in a pull-wire lighter or igniter 28 having a striking member 29 to which is attached a wire 30, soldered to the tear strip 17, so that on removal of the tear strip 17 the striking member 29 automatically fires the igniter 28. To prevent withdrawal the lower end of the fuze 27 is looped around a combustible pin 32. Spaced washers 33 at the bottom of the container 19 protect the fuze 27 and retain the compound C. A similar washer having openings 34a and 34b, corresponding to perforations 23 and 24, is placed underneath the top 22. The inner container 19 has a re-entrant base 19b attached to the container at 19d by beading. A cup-shaped spacer member 35 similar to the member 11 fitted within the lower end of the container 10 has a portion 35a of reduced diameter fitting within the re-entrant base 19b to hold the lower end of container 19 in position. The base of the outer container 10 is closed by a member 36, the rim 36a of which is secured together with the spacer member 35 by beading to the container 10 and is soldered to make a watertight seal. Various modified constructions are given using different means for attaching the igniter to the tear strip and providing handle members which lie along the length of the device in the inoperative position, being secured by an adhesive band until required for use. Means for anchoring the device to a raft may be provided. The outer surfaces of the containers are treated with a corrosionpreventing coating.