US Patent: 6,718X
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Railroads
Turning Short Curves Upon Railroads
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Patentee:
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| James Stimpson (exact or similar names) - Baltimore, MD |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Aug. 23, 1831 |
| Reissue Information: |
| Reissued as 9,128X (Sep. 26, 1835) |
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Joel Havens
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Description: |
| Patent 6,817X was reissued on 1835-09-26 and extended 1845-08-23.
Most of the patents prior to 1836 were lost in the Dec. 1836 fire. Only about 2,000 of the almost 10,000 documents were recovered. Little is known about this patent. There are no patent drawings available. This patent is in the database for reference only.
“For an improvement in the Mode of turning short curves on Railroads, such as the corners of streets; James Stimpson, city of Baltimore, August 23.
The plan proposed is to make the extreme edges of the flanches flat, and of greater width than ordinary, and to construct the rails in such a manner that where a short turn is to be made, the extreme edge of the flanch shall rest upon it, instead of upon the tread of the wheel; thus increasing the effective diameter of the wheel in a degree equal to twice the projection of the flanch. The claim made is to the application of the flanches of rail-road carriage wheels, to turn short curvatures upon rail-roads, or tracks, particularly turning the corners of streets, wharves, crossing of tracks, or roads, and passing over turnabouts, &c.
On turning to pages 270 and 271, vol. iv. there will be found specifications of two patents granted to James Wright, of Columbia, Pennsylvania, for the mode of turning curves claimed by Mr. Stimpson. The only difference is, that Mr. Wright proposes to adopt his cars to several different curves, by having three, or more, offsets in his wheels, when necessary.”
Journal of the Franklin Institute, Vol. 13, Feb. 1832 pg. 124.
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