Patent GB-191214609-A (GB)
Title: Improvements relating to Furnaces.
Inventor: YANO KIICHIRO
Filed: 1912-06-22
Granted: 1913-05-29
Abstract: 14,609. Yano, K. June 22. Grates; mechanical stoking; ashes, removing; crowns and roofs.-A furnace grate, of the kind comprising reciprocating fire-bars which are moved towards the fire-bridge simultaneously while alternate bars are returned successively in two series, is provided with special means for actuating the fire - bars; a reciprocating conveyer actuated by the grate bars serves to feed the fuel over a special form of dead-plate, while means are also provided for separating partly-burnt fuel from the ashes. To the front of the furnace are attached supports 1, Figs. 1, 4, and 7, on which are mounted the driving-shaft 4 and transverse bars 3, 3<1> which serves to move the fire-bars. To each end of the shaft 4 is secured a cam plate 7 having on its outer face a cam 8<1> and on its inner face a cam 8 and a forked cam 9, 9<1>, Figs. 9, 10, and 11. The front grate mover 3 is provided at each end with a roller which engages with the cam 8, and the rear grate mover 3<1> is provided at each end with a link 11 carrying a roller 11<1> adapted to engage with the cam 8<1> as shown in Fig. 11. In the first stage of the movement of the fire-bars, the cams 8 engage with the rollers at the ends of the bar 3 and move all the fire-bars and also the bar 3<1> towards the firebridge. In the second stage of the movement, the legs 9 of the forked cams engage with the rear bar 3', as shown in Fig. 10, and prevent its movement, while the leg 9<1> moves the bar 3 forwards and with it one set of alternate fire-bars. In the third stage of the movement, the outer cams 8<1> engage, as shown in Fig. 11, with the rollers 11<1> on the links 11 and move the bar 3<1> and the other set of alternate firebars forwards. The grate also comprises a rear set of fire-bars 12<1> arranged in stepped relation to the front bars 12. The bars 12 have cutaway portions engaging with the bars 3, 3'. The front ends of the bars engaging with the rear bar 3<1> bear against the front bar 3, so that when the bar 3 is moved rearwards the bar 3<1> is also moved with it. The bars 12 are provided with projections 13 which serve to distribute the fuel. The deact-plate 18 is provided with a projection 19 on its upper surface and a rib 19<1> on its lower surface which serves to return or force back any burning fuel. Air passages 20 are also provided in the dead-plate. Mounted on the dead-plate is a fuel conveyer consisting of a casing 21, the back wall 22 of which is inclined and provided with air passages 23 and buckets 24. The conveyer is provided with lugs 25 each of which is perforated to receive a rod 29 engaging with a special elongated grate bar having lugs 27, as shown in Fig. 7. A number of small adjusting-blocks are provided to fill in the space between the lugs 27 and the rod 29, so that by increasing or decreasing the blocks 28 the travel of the conveyer may be regulated. The rear bars 12<1> are mounted on the ash-tray 16 which serves to receive partly-burnt fuel, while the ashes passing over the ends of the bars 12<1> are received in the ash-pit below the tray 16. A crown plate 31 serves to heat the air or steam supplied from the injector 32.