US Patent: 21,782
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| Rotary planing-cutter
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Patentee:
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| John Sperry (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: |
Oct. 12, 1858 |
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Patent Pictures:
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Jeff Joslin
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Description: |
| The cutter-head is made of a series of thin plates, as shown. By staggering the plates, the cutters can take a larger shaving than they otherwise could. The cutters are designed with a flat section so that, by placing the cutterhead on a flat surface, all the cutters fall into alignment for easy sharpening.In judging the merits of the application for an extension, the Commissioner of Patents' report says, "No objection is presented by the examiner to the grant of the extension, except that a reference is cited which he regards as anticipating the invention. ... The patent cited, English patent no. 7,926 of 1839, shows a gang of circular plates placed and held on a shaft precisely as applicant's are There is no doubt these plates may be arranged with their teeth in line for sharpening or reforming, precisely as applicant's may, though for want of the construction covered by the second claim not with the same facility. For this reason I do not regard the reference as an answer to said second claim. ... But it is evident that the principal superiority of applicant's gang, to wit, the arrangement of the plates spirally about the shaft so that the blows are given successively instead of simultaneously, whereby power is saved and better work is done, does not appear in the reference. ... in light of the specification and drawing, which clearly set forth the peculiar construction and operation of the device, I think this claim may be saved by disclaimer limiting it to a plane with the blades arranged spirally around the shaft, as shown. Upon the filing of such disclaimer the patent will be extended." |
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