Patent GB-307963-A (GB)
Title: Improvements in conveyer furnaces
IPC: F27B9/26
Filed: 1927-12-15
Abstract: 307,963. Brayshaw Furnaces & Tools, Ltd., and Brayshaw, S. N. Dec. 15, 1927. Charging and discharging; charges, conveying. -In a gas-fired tunnel furnace of the kind in which the hearth is constituted by charge-conveying trucks B supported on an external runway C and adapted to be intermittently traversed through the furnace, means are provided for automatically removing a truck from the discharge end, lowering it to a return track F on which it travels back to the feed end, and raising it into position for re-charging into the furnace. At the ends of the furnace are arranged charging and discharging platforms H, D, carried respectively by pairs of arms h, h<1> and d, d<1>, which are actuated by gearings h<2>, d2, to raise and lower the platforms while maintaining them horizontal. The trucks B are pushed through the furnace by an intermittently reciprocated bar E which is fitted, at the inlet end of the furnace, with a pivoted catch e engaging a lug on the trucks, and, at the other end, with a hook e<1> adapted to engage with an axle of a truck and cause it, as it is lowered by the platform D, to tip and so discharge its contents. The trucks are traversed along the return track F by the engagement with the lugs thereon of projections g on an endless chain G. A vertically sliding charging-door a<1> is provided and the space occupied by the discharge platform D is closed, when the latter moves away from its truck-receiving position, by a horizontally movable door a<2>. The doors a<1>, a<2>, the platforms H, D, the bar E, and the chain G are all actuated from a single shaft K which is fitted with cams K<1> ... K<5> so shaped and arranged that the various parts are operated in the proper sequence. The cam-shaft K, Fig. 9, is intermittently driven from the main driving-shaft p, Fig. 7, through gearing p<2>, a clutch-shaft n<1>, n<2>, and worm gear n<3>, N<1>, the clutch n, N, being thrown into and out of engagement by a bent lever 0. The latter is moved to engage the clutch by a pin r on a timing-disc R driven by removable pins s on a worm-wheel S which is slowly rotated by a worm s<1> on the continuously driven part n<2> of the clutch-shaft. The clutch is disengaged when the lever 0 is struck by an arm o<1>, a weight w causing the latter to move sharply to the left, Fig. 9, when its toe o<2> is released by a gap k in a cam-ring K<6> secured to the worm-wheel N<1>. The cams K<1>, K<2> operate the platforms D, H through levers d<3>, h', respectively. while the cam k<3> effects reciprocation of the bar E through a vertical rod e<3>, weighted chain e<4>, and pivoted lever e<5>. The cam K<4> actuates the charging door a<1> through weighted lever a<3> and chain a<4>, while the closing movement of the door a<2> is produced by the engagement of the arm d<1> with a counterweighted rocking-lever a<6>, Fig. 4. The chain G is driven intermittently from the main shaft p through gearing p<1> and a clutch-shaft m, m<4>; the clutch M is engaged by contact of the cam K<5> with a finger m<2> on a shaft m<3> carrying a fork m<6>, and disengaged by a movement of the shaft m<3> in the reverse direction produced when a spring-controlled member M<2> is released by the projection g on the chain and strikes the finger m<5> on the shaft m<3>.