Patent GB-191123417-A (GB)
Title: Improvements in and relating to Furnace Grates.
Inventor: MCLARTY FARQUHAR MATHESON
IPC: F23H1/04
Filed: 1911-10-24
Granted: 1912-11-25
Abstract: 23,417. McLarty, F. M. Oct. 24. Fire-bars and grates; doors and door frames. -Relates to furnace grates of the kind having rotating or rocking fire-bars and more particularly to fire-bars of the kind described in Specification 23,648/07. and consists in providing the bars with special removable fuel-supporting surfaces and means for locking the bars in their stationary positions; plates are also provided at the front and rear ends of the grate for retaining the fuel on the grate and are fitted with seats for supporting side stationary bars. Figs. 1, 2, 3, 7, and 8 of the drawings filed with the Provisional Specification and Fig. 1 of the drawings filed with the Complete Specification show one form of fire-bar a adapted to be rocked or partly rotated on roller bearings at its ends and provided with vertical slots in which are inserted removable grate pieces g having holes f through which pins or equivalent means are passed for holding the grate pieces in position. The grate pieces are provided with cross ribs z which rest upon the upper edges of the bar a. The bars are provided with circular collars h partly surrounded by the inner edges of front and rear plates f<2>, g<2> which serve to retain the fuel on the grate. The necks of the bars are provided with carriers m for rollers l which rest on circular paths in bearers n supported by the dead-plate n<5> and a bracket n<8> resting on the bridge bearer n<7>. To prevent the bars from moving endwise a keeping bar is provided on the front of the furnace to engage with a groove q formed between collars on the front end of each bar. In order to lock the bars in their stationary positions the front ends are provided with grips b in the form of collars having slots with which engage wypers s on the wyper shaft c. The bars are rocked by a handle which is shipped nn the outer end of each bar. Figs. 7 and 8 of the drawings filed with the Complete Specification show a modified form of bar in which the grate pieces are held in position by clips p<2> bent outwards at p' to grip the bottom edges of the bar a. Fitting strips d<5> on the longitudinal webs of the grate pieces engage with corresponding strips on the bar, and between the grate pieces and the bar aro provided inner air spaces s<3>. The ribs z of the grate pieces rest upon thickened portions g<3> on the outside of the bar which is also cut away to provide air spaces coinciding with the air spaces between the ribs z. Figs. 11 and 14 show a built-up furnace bar the necks of which are of cast steel and the body of sheet steel. The body is attached and riveted to the necks of the bar by the aid of a clamping-piece k<3> having a collar h and snugs d<6> to receive the web of a grate section which is secured thereto by pins engaging with holes f. Curved distance-pieces r<2> throughout the length of the bar having snugs d<6> also serve for securing the sides of the bar and the grate pieces. Fig. 15 shows the end fuel-retaining plates f<2>, g<2> provided with projections z<4> for supporting the side stationary fire-bar x<4> and projections z<5> for supporting the bar laterally. Figs. 3 and 4 show a furnace front for use with the fire-bars described above, the bottom plate y<2> being provided with extensions z<2> to carry brackets for supporting the wyper shaft c which may be arranged above or below the necks of the fire-bars. The curved side of the front may be kept cool by circulating air through a jacket formed by placing a sheet of metal around and about half an inch from the casing, the jacket being open at top and bottom. One door laps the other as indicated by the dotted line b<3>, so that both doors may be opened by pulling the handle c<3>. An observation window d<4> is provided in one of the doors, or above the doors.