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Title: |
1890 Article-Wheelock Engine Co., Steam Engines |
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Source: |
The Steam User 1890 pgs 96-97 |
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Insert Date: |
4/20/2011 12:52:08 PM |
The illustration on the opposite page represents a pair of improved Wheelock Engines in the State Street power station of the Chicago City railway.
The Wheelock Engine is original and unique, a type radically differing from all other engines. Previous to 1885 it was built M-ith the well - known suspended rotary valves. The so-called New System Valves were brought out about that time, and have entirely supplanted the older form. In 1888 the Wheelock Engiue Company, succeeding Jerome Wheelock, the inventor and former builder, entirely redesigned and improved the engine.
The most remarkable feature of the Improved Wheelock Engine is the Valve System, a general idea of which may be obtained from the following description and illustration:
The valve employed is a multi-ported slide, working on a flat seat, formed within a skeleton plug or shell, through which passages are cored, forming ports into and out of the cylinder. The valve and operating parts being mounted upon or within this shell, they together form a complete and self-contained piece of mechanism entirely independent of the cylinder. The shell is turned slightly tapering, to fill corresponding holes in the walls of the steam-chest, and being ground to a steam-tight fit therein, it, with the contained valve, seat, and operating parts, is lightly driven into place and is retained secure without the need of other means of fastening than results from the tapered driven fit.
The valve is operated from a rocking spindle having bearings in the ends of shell. Motion is communicated from the spindle through crank arms and a pair of short links connecting the latter with the valve, and forming a toggle joint which converts the rotary motion of spindle into reciprocatory motion of valve. (These engines are manufactured by the Wheelock Engine Co., Worcester, Mass.) |
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1890 Wheelock Engine Co., Steam Engines
1890 Wheelock Engine Co., Steam Engine Valve
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