Patent GB-236519-A (GB)
Abstract: 236,519. Svenska Aktiebolaget Gasaccumulator. July 1, 1924, [Convention date]. Mantle carriers and accessories. - In signal lamps in which a broken incandescent mantle is replaced automatically, the reserve mantles and their holders are situated whollv or mainlv out of the path of those rays which are refracted or reflected by the optical system. In one form, the mantle-holders 8 are disposed radially of the gas-pipe 11 within a conical space bounded by the uppermost rays which strike the prisms 6 of the optical system so that' the rays passing to the latter are intercepted only by the holder of the operative mantle 43. Each mantle is carried by a conical ring 17 clamped in a ring 18 fixed to a. holder 8 on a. shaft 20, carrying a pinion 24, engaging a vertically movable rack 25 and connected to a lever 21, which is retained within the holder 8 against the action of a spring by a wooden pin 23. When a mantle breaks the pin 23 is destroyed and the lever rises, thereby lowering the rack 25 and an attached roller 26 and allowing a casing 10 to rotate under the action of springs 9, the roller passing under a cam 29 on a track 28, against which it is pressed by a spring 27. The roller then rises on the cam and the upward movement of the rack 25 rotates the holder 8 upwardly into the inoperative position, the rack being provided with a pin 30 engaging a guide 31 on the cam to ensure its upward movement. The next holder is moved down by the movement of its roller on the cam until its ring 18 abuts against the burner 2 and stops the mechanism. The reserve mantles are surrounded by protecting hoods 32; the escape of the combustion gases through passages 33 between the hoods serves to induce air into the lamp through spaces between the prisms 34. In a second form, as shown in Figs. 2, 2<a> and 6, the mantle-holders 42 are disposed wholly or mainly within a conical space bounded by the lowermost rays which strike the prisms 34. The reserve holders are disposed in a circle on a turntable 57 in a casing 37 below the lamp, each holder being connected by links 63 to a standard 64 and maintained in a raised position relatively thereto by a pin 65. The standard 64 carries apertured members 66, 67 for engagement by projections 53, 58 on a carriage 41 and the turntable 57 respectively. The carriage 41 is coupled by a link 52 to an endless chain 40 mounted on wheels 49, 50 on a standard 39 and driven through gearing by a weight and is provided with wheels 82 running on the standard. When a mantle breaks, the pin 65 is destroyed, the holder 42 sinks on the standard 64 and the link 52 is allowed to pass over the wheel 50 so that the carriage is carried down the standard 39 by the chain. The holder is subsequently placed on projections 58 and the carriage 41 strikes the end 81 of a pivoted ratchet arm 68, a tooth 72 thereon moving a ratchet wheel 74 on the turntable 57 forward until a roller 79 on a spring-pressed arm 76 moves overa tooth 80 on the turntable into the next gap when the next holder is located over the carriage 41 and subsequently carried upwardly thereby until it abuts against the burner 44 when the mechanism is stopped. To ensure the movement of the table through one tooth only, a ratchet tooth 73 is adapted to engage a ratchet-wheel 75 when the arm 68 is pressed down to the fullest extent. In a third form, the mantle-holders are attached to supports, secured at fixed distances apart' on a similar endless chain 40, so that, when a mantle breaks, its holder sinks on the support and is turned backwardly by a spring to allow the chain to move until the next holder abuts against the burner. The reserve mantles may also be disposed on an endless band, or arranged, side by side, or one above another, in a magazine so that the next mantle is brought automatically into the position previously occupied by the oneremoved.