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US Patent: 1,868,440
Boring machine and method
Ewald A. Arp - Minneapolis, MN

USPTO Classifications:
408/234, 408/709, 408/83

Tool Categories:
specialty tools : automotive tools
trade specific : automobile mechanic
metalworking machines : drilling and boring : boring bars
metalworking tools : boring bars

Van Norman Machine Tool Co. - Springfield, MA

Van Norman Machine Tool Co. - Springfield, MA


Patent Dates:
Applied: Jul. 29, 1929
Granted: Jul. 19, 1932

Patent Pictures:
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"Vintage Machinery" entry for Van Norman Machine Tool Co.
Patent number seen on a Van Norman "Per-Fect-O" 77/S4 boring bar, along with patents 1,906,241, 1,881,993, and 1,954,034.

"My invention relates to machines for finishing the bore of cylinders. It relates more particularly to machines for use in connection with cylinders of automobile engines, either to finish the bore of new cylinders or to refinish the bore of cylinders which have become uneven through use. An object of the invention is to provide a machine which will give a smooth and uniform finish to the bore of the cylinder making it unnecessary to follow up the cutting operation by a honing operation..."

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