US Patent: 37,980
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| Steam Engine Indicator
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Patentee:
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| C. B. Richards (exact or similar names) - Hartford, Hartford County, CT |
| USPTO Classifications: |
| 346/5 |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Mar. 24, 1863 |
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Patent Pictures:
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Joel Havens
Richards Steam Engine Indicator, ca 1864
The Story of the Steam Engine Indicator
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Description: |
| This was the first steam engine indicator patented in the U. S.
Abstract:
My invention relates to an improvement in apparatus for indicating and delineating the action of steam in the cylinder of a steam engine. The form of steam-engine indicator in most general use is that commonly known as the "McNaught indicator," in which the piston and its guiding-rod have the same range of motion as the pencil but as the piston and rod are necessarily made quite heavy, and their range of motion extensive in order to produce delineations on a sufficiently-large scale, the momentum of these parts is so great as to render the instrument unserviceable for application to engines having rapid movement. While, therefore, it is desirable to reduce the momentum of the parts which are moved by the varying pressures of the steam, it is also desirable that the pencil or marking-point should move in a straight line, in order that its delineations, which should be on a large scale, may readily be measured with accuracy, and in order, also, that the paper on which the delineations are made may be clamped in the usual manner around a cylindrical drum, to which the requisite movements can be readily given by the customary means. To furnish an instrument possessing the above-mentioned desirable features is the object of my invention ;and to this end my said invention consists in the employment of a lever or its equivalent so connected with the pencil and the piston as to give to the pencil a range of motion greater than that of the piston, in combination with a system of levers, or an equivalent therefor, so arranged as to cause the pencil's point to travel in a straight line.
Claim:
he means, substantially hereinbefore de-scribed, for giving to the marking-point a range of motion greater than that of the piston by which it is actuated, in combination with the described means, or an equivalent therefor by which the marking-point is caused to travel in a straight line. |
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