Patent GB-141725-A (GB)
Title: Improvements in, and relating to, travelling grates for furnaces
IPC: F23H11/00
Filed: 1920-04-14
Abstract: 141,725. Lloyd, W. May 4,1916, [Convention date]. Fire-bars and grates; air supply, regulating; dampers; ash-pits.-Relates to the air supply arrangements and to the detail construction of travelling chain grates. The wind chest 27, Fig. 2, is divided by a transverse partition 28 into two compartments each of which is divided into three by two longitudinal partitions. Air is supplied from a main at the side to tuyere boxes 29, 30 which have reduced tops 58, 60, and further subdivide the main compartments. Individual supply to each sub-compartment is effected through valves 37, Figs. 2 and 11, having a bevelled lower edge running on bevelled rollers 44 and an upper edge engaged by a bracket 41, and each having a rod extending out to the side of the furnace. Each transverse set of valves may, however, be interconnected. Openings 48 leading to door-controlled openings outside the furnace, together with alined doors such as 52 in the longitudinal partitions, allow of removing ashes, and there are also doors giving access to the tuyÞre boxes. Joint is made with the grate by plates 57, 58, 59 &c. on the transverse partitions and by similar plates on the longitudinal partitions engaging special longitudinal ribs on the undersides of the grate bars, and leakage past the lower run of the grate is prevented by plates 74, 75 engaging it on both surfaces. The bearings of the front drum are slidably mounted, Fig. 12, and fitted with chain tensioning spring 96 to allow for heat expansion. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the following subject-matter : The small grate bars, Fig. 11 (Cancelled), forming the actual fuel-supporting surface are carried on a wedge-shaped rib 77 bolted to each main grate bar, the last bar to be put in place being secured by a bolt with undercut head. Each small bar is recessed on one side at 103, Fig. 15 (Cancelled), and formed with spacing studs 104 and ribs 106, 107 and 108, 109 providing end and central air spaces. The studs 104 are beneath the transverse slots 105, which latter are in staggered relation on adjacent bars, Fig. 15 (Cancelled). The " aprons " 111 for catching ash &c. when the bars open over the rear chain drum have projections 112 engaging corresponding recesses in the adjacent set of bars and designed to impede the flow of air between the sets of bars and assist in retaining ash. The extreme ends of the main bar heads 63, Fig. 17 (Cancelled), are overhung by the side masonry, and their inner portions are provided with cross grooves 81 in communication with the air supply. The links of the two chains each consist of a pair of offset bars juxtaposed at one end and affording spaces in which projections 84 from the main bar heads 63, Fig. 17 (Cancelled), are secured by means of a pin 85 the head end of which screws into one of the bushes 86 of the link and is locked by a cotter 88 engaging a groove across the bush. The supporting surfaces for the chain are provided by renewable plates 89, Fig. 17 (Cancelled), secured by bevel-headed bolts 90 engaging bevelled slots in the plates, thus allowing of slight longitudinal adjustments. This subject-matter does not appear in the Specification as accepted.