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Description: |
| Listed in A List of Patents Issued by the United States, from 1790 to 1847, pgs. 158 & 373.
The grant date in this book lists only Sept. 1836. No day of the month is listed.
NU series patents are post-July 1836 patents that do not have numbers and are not listed in the USPTO patent series. They have been arbitrarily assigned NU numbers, which consists of the issue date in ISO format followed by a single number to separate multiple patents issued on the same date. This is to allow them to be entered into the Datamp file. These patents are listed in the List of Patents for Inventions and Designs, published in 1847. They are entered here for reference and further research only.
"Specification of a Patent for an improved tool, or instrument, for cutting the grooves in the Hubs of Car Wheels. Granted to Francis Barker, Baltimore, Maryland, 1836.
To all whom it may concern be it known, that I, Francis Barker, of the city of Baltimore, in the State of Maryland, have invented an improved tool, instrument, or apparatus, for cutting the grooves in the hubs of wheels for rail road cars, to receive the pins by which they are confined on the axles, and which tool, instrument, or apparatus may also be used in other cases where similar grooves are to be cut in metal for other purposes; and I do hereby declare that the following is a full and exact description thereof.
I prepare an iron mandrel of the size of the bore of the hub, which mandrel I fix so as to stand up vertically from a stout block of wood, or of metal. The mandrel should be of such length as to rise one or two inches above the hub, when the wheel is placed thereon. Along the mandrel I cut a rectangular, or other formed groove, which may be three-fourths of an inch wide, and as much in depth; this groove is to receive the chisel, by which the cutting is to be effected, and is made the entire length of the mandrel, and down through the block upon which it is fixed, to allow the chisel, and the chips cut by it, to pass clear through.
The chisel I make of cast steel, of such width as to fit, and slide freely down, the groove; and on its outer side or face, it has a semicircular projection, near the lower end, of the size and form of the groove to be cut, and this projecting piece being properly sharpened, constitutes the cutting part of the chisel.
In operating with this apparatus, when a groove is to be cut, the wheel is placed upon the mandrel, the chisel is placed within the groove, into which a loose strip of iron has been introduced to make a bearing for the back of the chisel, and for the purpose of allowing its free return, the chisel being of such a thickness as that the cutting edge thereof will take the proper hold of the hub for the removal of the first chip; it is then driven through by means of a large hammer, or otherwise. A strip of metal of a suitable thickness for a chip, is then placed in the groove of the mandrel to make a bearing for the back of the chisel, which is again driven through, and so on, successively, until the cutting is completed.
Having thus fully described the tool, instrument, or apparatus, invented by me, for cutting grooves in the hubs of car wheels, and for all other purposes to which it may be found applicable, I do hereby declare, that I do not intend by this description to confine myself to the precise form and construction set forth, but to vary the same as I may think proper, so far as may be found necessary to adapt it to the particular purpose to which I may apply it, claiming as my invention, the using of the groove in the mandrel, with the appurtenances above described, as a guide to the chisel, in cutting grooves, the whole operating substantially in the manner set forth. FRANCIS BARKER."
Journal of the Franklin Institute, Jan., 1837, pgs., 30-31
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