If you find a patent number or patent date by this manufacturer that is not on this
list, please contact the Site Historian.
Key to Links for Patent Information
USPTO = U.S. Patent Office .
Images of the actual patent can be viewed on the U.S. Patent Office web site but
a special TIFF viewer must be installed with your browser in order properly work.
More information on how to configure your computer to view these patents can be
found at TIFF image Viewers
for Patent Images.
DATAMP = Directory of American Tool And
Machinery Patents . A sister site to VintageMachinery.org with information
on patents related to machinery and tools. A much easier user interface than the
USPTO's for finding information on machinery patents.
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189,925,244
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Nov. 24, 1900
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Indicators
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John Clark Dobbie |
, Scotland |
In steam-engine indicators, and more especially in those of the type described in Specification No. 11,026 of 1898, and with the object of improving the construction and the lessening the weight of the moving parts of such indicators, so as to render them more sensitive, the overhanging arm, and preferably also the back stay, radius link, and other moving links connected thereto, are made of aluminum or similar light metal or alloy. The pin joints or other parts on which the arms and links oscillate, are made of steel or other hard metal, the pins being of hard metal, and the orifices through which they pass being lined with bushes of metal hard enough to withstand wear. The piston and piston-rod are by preference made of a single piece, which is turned down to form two or more disc-like pistons at one end, and is reduced in diameter to form the piston rod throughout the remainder of its length, and this piston-rod may be bored out to lighten it. The discs may be cupped or turned with a lip or flange to fit the cylinder on the indicator, and one of these discs fits the cylinder steam tight, whilst the other, or others, may serve as a guide or guides, and may be perforated for further lightness, and to allow of the passage of grit into the space between discs. |
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689,640
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Dec. 24, 1901
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Steam Engine Indicator
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John Clark Dobbie |
, Scotland |
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