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Title: |
1896 Article-Dake Engine Co., Square Piston Steam Engine |
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Source: |
Cassier's Magazine Oct 1896 pg 460 |
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Insert Date: |
7/23/2011 7:33:10 PM |
Radically different from the engine just considered is that shown in elevation and detail on the next two pages, and known as the Dake square piston engine. It is not a rotary engine as its appearance, at first glance, might indicate, but a double regular reciprocating engine of very compact make. It is shipped by the builders ready to bolt down and set to work diameter, simply slides back and forth. The connections between the cross-head and the pistons are all ball and sockets, and their motion is that of a figure 8. In the upper one of the illustrations opposite, the two pistons are removed, snowing the interior of the case with the crank in position. The latter revolves in a special chamber.
The illustration below shows the pistons in their proper position on the crank and carried to the extreme right hand. Both pistons have a horizontal movement, sliding from side to side, and at the same time the inner piston, to which the crank pin is attached, has a vertical or up and down movement, the two movements imparting rotary motion to the crank. The steam supply to the pistons is effected through channels in the cover, leading down to the centre from above, one opening into a central aperture, and the other into an annular opening. Four channels are cored through the inner piston, two leading to the top and bottom, respectively, and one to each end of the inner piston; these latter also lead through the ends of the outer piston. Four ports, corresponding with the channels in the interior of the inner piston, are cut through the face (or side next to the cover), of the inner piston, in the proper position to register over the central aperture in the cover. The steam, entering the port in the inner piston, through the central aperture of the cover, imparts motion to the crank, the port passing over the annular ring and exhausting into it after having done its work. There are four distinct impulses of steam to each revolution of the crank and the arrangement of the ports to the crank is such that each impulse of steam is given at a point where it has the greatest power. The inner piston is fitted with phosphor-bronze slides that admit of a thin piece of tin or sheet iron being inserted when the wear is sufficient to allow it. A wedge-shaped plate, on which the lower slide rests, is arranged with set-screws on the outside of the case; this keeps the piston steam tight top and bottom. The Dake engine is recommended for direct connection at either low or high speeds, having, it would appear, giving satisfactory results in such work in many cases. In driving centrifugal pumps, for example, it has been known to perform admirably under severe conditions. |
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1896 Dake Engine Co., Square Piston Steam Engine
1896 Dake Engine Co., Square Piston Steam Engine. Cylinder
1896 Dake Engine Co., Square Piston Steam Engine, Cylinder with Pistons
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