Patent GB-190927326-A (GB)
Title: Improvements in Steam Engines.
Inventor: MCCOLLUM JAMES HARRY KEIGHLY
Filed: 1909-11-24
Granted: 1910-11-03
Abstract: 27,326. McCollum, J. H. K. Nov. 24. C a m gears; valve spindles and valvespindle guides; slide valves; expansion valves. -The cylinder casing 1, Fig. 1, is provided with a central annular steam chamber 38, and end exhaust chambers 16, 24 which lead to a common outlet 8. The cylinder heads 13, 24 are provided with central bosses which carry the barrel 17. A cylindrical distributing-valve 28 is arranged around the barrel 17 and moves over end ports 18, 19. A ported ring 9 is arranged between the head 13, the valve 28, and the casing 1; and the head 23 is provided with an extension 22, which engages the exterior of the other end of the valve. An expansionvalve 39 is arranged around the distributing- valve and is provided with ports 40, 41 which register with the ports of annular passages in the distributing-valve. The valves 28, 39 are operated by links and levers secured to the shafts 51, 52, which are oscillated by eccentrics 47, 48 in the manner shown. In the modification shown in Fig. 13, the casing 140 is provided with annular projections 143, which engage the exterior surface of the expansionvalve or, in the absence of an expansion-valve, the exterior surface of the distributing-valve. The ring 9 and extension 22, Fig. 1, are dispensed with. The distributing - valves in all arrangements are provided with webs for keeping the packing in place. In the arrangement shown in Fig. 11<a>, the cylinder head 151 extends beyond the cylinder ports, and is provided with webs 155 to support the central part of the cylinder barrel. The cylinder heads are heated by exhaust steam, which passes through slots 156 provided for the purpose. In the gears for the above-described valves, Fig. 5, the eccentrics 60 are arranged on the crankshaft and operate a link 61 connected to the distributing-valve. The eccentric 73 is arranged on a longitudinally-adjustable helix 65 on a countershaft 62, and operates the expansionvalve. The valves may be operated by eccentrics on the main shaft under the control of a centrifugal governor. The eccentric 89, Fig. 8, is loosely mounted on the shaft 77 and operates the distributing-valve. It is connected by links 90, 91 to the pivoted arms 82, 83, Fig. 7, which carry the governor weights. The eccentric 88 actuates the expansion-valve and is mounted on a spur wheel 79 loosely mounted on the shaft 77. The wheel 79 is in gear with wheels 80, 81, connected by links 84, 85 to the arms 82, 83. The distributing-valve may be operated by Stephenson's or Walshardt's valve-gear, and the expansion-valve may be operated by the gear shown in Fig. 9. The cranks 94, which are at right - angles, are operated from the cross-head or from the link in a Walshardt's gear. The expansion-valves are operated by links 125 connected to the cranks 99 on the shaft 97. The shafts 97, 92 are provided with threads upon which are mounted geared spurwheels 101, 102 enclosed by a longitudinallyadjustable frame 103. The adjustment of the frame produces relative motion between the cranks 99, 94. The distributing-valve rods 133, Fig. 12, are connected to the valve-gear rod 136 by means of links and levers.