Patent GB-268834-A (GB)
Title: Improvements in or relating to stoves or furnaces
IPC: F23H13/00
Filed: 1927-04-04
Abstract: 268,834. Howe, F. D. April 5, 1926, [Convention date]. Closed solid-fuel stoves; air-heating stoves; feeding; grates; baffles; doors; air supply for combustion.-In a closed solid-fuel stove, a smokeless fire is maintained on a substantially horizontal grate G adjacent to a transparent door B, which is remote from the fuel inlet. " Zoned " combustion of the fuel occurs, there being a coking zone at the rear of the front combustion zone, and an unignited zone' at the rear of the coking zone. The stove shown in Figs. 1 and 3 comprises a feeding-chamber D at the rear, having a hinged cover F and containing a pivoted fuelpusher E mounted on a shaft E<1>. The pusher is operated through an arm E<2> secured to the shaft E' and carrying at its outer end a shaft E<5>, on which are mounted a pinion E<3> engaging a fixed gear sector E<8>, a ratchet wheel E<4>, and an operating-handle E<6> carrying a reversible pawl E<7> which engages the ratchet-wheel E<4>, and through it rotates the pinion E<3> in one direction or the other when the handle E<6> is reciprocated. The grate comprises an upper fixed set of bars G which are tapered in plan to give an increasing air-space towards the front, and a lower set of shaking bars H mounted in notches in transverse rear and front bearers S, U, the latter extending through the wall and being operated by a lever to shake the bars. The air space H<1> between the upper and lower bars preferably increases towards the front. A front grate I is mounted on a shaft I<2>, and is rocked by a handle I<4> mounted, with a degree of lost motion, on an arm I<3> secured to the shaft. A pawl I<5> on the cam I<3> engages a fixed ratchet and secures the grate I in raised position until released on the initial forward movement of the handle I<4> by a pin I<7> upon it. At the front and rear of the grate are pivoted plates L, X which serve to dump ashes and to admit air. Above the rear of the grate is a hollow baffle Q pivoted on hollow trunnions Q<1>, through which air is admitted to the baffle and thence to the fire. The baffle lies on the fuel and directs the gases forwardly. A baffle A<2> is attached to the top wall of the fire-box, and the front A<3> of this wall is incurved, to keep the smoke from the doors B. In feeding the fire, the front gate I is lowered, and the burning fuel is pushed on to it by the new charge; the grate I is then raised, and forces the burning fuel back upon the fresh fuel, so producing a smokeless fire. The doors B closing the front of the stove comprise outer and inner frames Y, Y<2>, Fig. 7, with glass, mica, or like panels 0 held in metal channels Y<4>, the parts being fitted to allow for the free expansion of the panels. The stove is provided with an air-heating chamber formed in part by a metal front wall W<2>, and having air inlets and outlets W<3>. W<4> at bottom and top. The rear metal walls of the combustion chamber and smoke flue R are exposed to radiate heat, the sides of the stove being enclosed in brickwork. Fig. 8 shows a double-fronted construction for giving an open fire effect in two rooms, in which fuelfeeding devices D, E are arranged at each side. front grates I and doors B are provided at each face, and all controls are duplicated so as to beoperable in each room.