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US Patent: 51,563
Pipe Expander
John Critchley - Portsmouth, NH

USPTO Classifications:
29/90.01, 30/103, 408/164, 82/169

Tool Categories:
specialty tools : pipe expanders


Critchley & Whalley - Portsmouth, Rockingham County, NH

William Cartlidge, Jr.
William Critchley, Jr.
Theodore Lusch

Patent Dates:
Granted: Dec. 19, 1865

Patent Pictures: [ 1 | 2 ]
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Munn & Co.- patent attorneys

This invention relates to a tool, which can be used as a mandrel, or for reaming, tapping, boring, and other work. It consists of a cylindrical stock with three or more tapering grooves cut in its surface parallel to its axis, in combination with keys fitting into said grooves, and with nuts applied to the ends of the stock and bearing on the ends of the keys or cutters in such a manner that by unscrewing one of the nuts and screwing up the other the keys or cutters are caused to slide in the tapering grooves, and consequently to expand or contract radially, and an expanding mandrel, reamer, tap, or other tool is obtained of great practical convenience..

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