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US Patent: 51,257
Screw Cutting Machine
Joseph R. Brown - Providence, RI

USPTO Classifications:

Tool Categories:
metalworking machines : screw machines

Brown & Sharpe Mfg. Co. - Providence, RI

Not known to have been produced

Issac A. Brownell
William Brownell

Patent Dates:
Granted: Nov. 28, 1865

Patent Pictures:
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"Vintage Machinery" entry for Brown & Sharpe Mfg. Co.

My said improvement relates, first, to the means by which the rod or piece of metal from which the screw is to be formed is griped and held at the end of a revolving spindle; and it consists in combining with suitable griping jaws a set of wedges at the end of a rod or tube within the spindle, and a rotating screw for imparting a sliding movement longitudinally to the said rod or tube and the wedges thereon, so that the wedges are made to force the griping-jaws together to gripe the rod or piece of metal, and afterward to liberate the same while the spindle is revolving.

My improvement relates, secondly, to the means employed to4 hold and control the operation of the threading-tool; and it consists in combining a tool-holder capable of holding a tap or die or other suitable threading-tool with a reversible clutch in such a manner that the holder and tool may slide and cut the screw-thread up to a given point, and then be liberated by the clutch and revolve with the threaded-screw until the revolution of the spindle is reversed, when the tool-holder is arrested and held from turning while the tool is being withdrawn from the threaded screw.


The combination of a set of griping-jaws, l, and a set of wedges on a sliding rod or tube, m, or its equivalent, with a hollow screw, F, the same being constructed and arranged to operate within a revolving spindle, substantially as described, for the purpose specified.

2. The combination of the threading-tool holder and the reversible clutch, constructed and arranged to co-operate with a revolving spindle.

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