Identifier: railwaylocomotiv16newy (find matches)
Title: Railway and locomotive engineering : a practical journal of railway motive power and rolling stock
Year: 1901 (1900s)
Authors:
Subjects: Railroads Locomotives
Publisher: New York : A. Sinclair Co
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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nace by that concern.The hearth is 14x9 feet, and is 20 incheshigh at the sides, and 26 inches high atthe center of the arch. The door itself is composed of five cast sections with two half-sections, oneat each end. The sections are bolted to-gether through a flange on the outside,and are filled with fire-brick inside. Thecentral chain is the one which does thelifting, being attached to a hook oper-ated by a 6-inch air cylinder with about30-inch stroke. The two side chainspass over pulleys bracketed against thewall and pass outside the wail of thebuilding where two counter-weights, each and at the same time makes the long,low fire-proof door equivalent to one offrom ten to twelve feet high. Two flatbar iron diagonals, from the doorproper, are bolted to a flat, iron cross-brace, as shown at A. With the aid ofa short iron strap at the back thecounter-balance chains are firmlyclamped as shown in plan, at B. Thereis no chance for the door to rack or toswing sideways, though the pull which
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PLATE ANNEALING FURNACE DOOR about 400 pounds, balance the door.Over this furnace is a shop window, andthe problem was to arrange the raisingand lowering mechanism so that the lightshould not be interfered with and yetthat the door should work easily andpromptly without sticking or saggingdown at one end. These two conditionswere met by the construction shown. The mechanism consists of a bracedskeleton frame which offers no obstruc-tion to the entrance of light to the shop, raises it is applied through the centerchain. All three chains are secured bydove-tail hooks, slid into dove-tail lugson the castings. The center chain isquite independent of the skeleton frame.The placing of the counter-weights out-side the building does away with thepossibility of their getting in the way,and in case of breakage of chain or hookthe risk of injury to any employee is en-tirely obviated. The whole arrangementis planned to secure maximum advan- 250 RAILWAY AND LOCOMOTIVE ENGINEERING June, 1903. tages

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