Specification of Thomas Loftus : smoke-consuming apparatus.

  • Loftus, Thomas.
Date:
1864
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Thomas Loftus : smoke-consuming apparatus. Source: Wellcome Collection.

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    A D. 1863.—N° 2042. Specification. » . Loftus Improvements in Smoke-consuming Apparatus. the air valves being closed and the combustion bar brought into action, causing the smoke to ignite and become at once consumed. And in order that my said Invention may be fully understood, I shall now proceed more particularly to describe the same, and for that purpose I shall refer to the several Figures on the Sheet of Drawings hereunto annexed, the 5 same letters of reference indicating corresponding parts throughout all the , Figures. Fig. 1 of the Drawings represents a longitudinal vertical section of a steam boiler furnace fitted with my improvements, and applied to a central cylin¬ drical flue steam boiler; Fig. 2 is a sectional plan of the same, taken above 10 and below the fire-bars; and Fig. 3 is an end elevation of the boiler, shewing the fire-door and parts connected and operating therewith. A is the boiler; B, the furnace ; C, the dead plate; and D, the improved perforated bevel bridge. The front or inner part of the dead plate is per¬ forated, as shewn at a, or a separate perforated plate or grating may be 15 introduced at that part for the admission of air into the furnace from the ash¬ pit E. Immediately beneath the perforations a there is fitted a kinged door or air valve F, which regulates or controls the passage of the air through the perforations. G is a second air valve contained within a box or casing H situate at the farthest end of the ash-pit, its object being to regulate the supply 20 of air to the back part of the bridge. Both these air valves are actuated by a rod I, which also serves to bring into position the combustion bar K, by throwing it forward over the bridge or backwards into the position shewn in red lines, such combustion bar being brought over the bridge when the air valves are closed and moved back, as shewn by the red lines when the air 25 valves are opened. This combustion bar may, however, be used or dispensed with at pleasure, as the apparatus is complete without it. The bridge D is made of cast iron, it is bevelled downwards on its face towards the rear ends of the fire-bars, as shewn, and is perforated or made cellular so as to allow it to become readily heated to redness, the heat of the bridge and combustion 30 bar greatly facilitating the combustion of the gases as they pass over and in contact with them. The rod I, which works the air valves, is Connected by a long link or connecting rod L, which is jointed thereto to the horizontal lever M, which works on a fixed centre b, and traverses over the surface of a supporting quadrant or frame N secured to the framing of the fire-door 0. 35 At or near the centre of this quadrant there is formed a notch or recess, into which the lever M drops when it is brought into the position shewn by the red lines, and is there retained until it is released in the manner herein¬ after described. Immediately beneath this notch or recess, and in a line