US Patent: 5,613X
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| Knife Sharpener
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Patentee:
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| William J. Dunn (exact or similar names) - New York, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Aug. 18, 1829 |
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Joel Havens
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Description: |
| 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 instrument for Sharpening Knives, and other cutting instruments made of iron, or steel, called “Dunn's knife sharpener;" William J. Dunn, New York, August 18.
This, in its mode of operation, is very similar to some instruments for a like purpose, which we have already described; (see p. 398, of the last vol.) Two steel plates are prepared by having teeth cut into them similar to saw teeth: they, however, differ from saw teeth in being varied in size, the angle at the bottom being made more acute, as you proceed from one end towards the other. The two plates are notched alike, and are to be placed upon each other, and retained in their situations by a screw, or screws. The plates may be about two inches in length, and when fixed in a handle, or stand, for use, the teeth of the two are not allowed exactly to coincide, the plates being slid a little, endwise, the angle at the bottom of each notch is then formed by the two plates conjointly and by altering the lapping, a new sharpening angle is obtained. The claim is for forming the teeth of two, or more sizes and widths, so as to adapt it to the sharpening of knives, and other instruments of different sizes, more effectually; and with two, or more, steel plates.”
The same end has been attained in one of the English instruments above alluded to, and also in some made in this country. The defect of instruments of this kind, where but two plates are used, is, that the knife, in being sharpened, has its hollows, or indentations, rather increased than corrected, whilst the number of bearings employed in Westby's, and other sharpeners, straightens, as well as sharpens the edge. The mode of altering the angle in the sharpeners may be seen in the wood cut of Westby's.”
Journal of the Franklin Institute Vol. 8, Nov. 1829 pgs. 333-334
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