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US Patent: 258,533
Adjusting-gearing
Patentees:
Alexander Gordon - Cincinnati, OH
George T. Reiss - Hamilton, OH

USPTO Classifications:
476/58, 74/507

Tool Categories:
metalworking machines : drilling and boring : drill presses
woodworking machines : wood drilling and boring : drill presses

Assignees:
Niles Tool Works - Hamilton, OH

Manufacturer:
Not known to have been produced

Witnesses:
John Lorenz
J. W. See

Patent Dates:
Applied: Apr. 08, 1882
Granted: May 23, 1882

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for Niles Tool Works
Description:
This is the earliest instantiation we can find for the "sensitive drill" friction-drive mechanism, which has a metal disk mounted on the end of the input shaft, and a rubber disk at right angles and connected to the output shaft. The rim of the rubber disk rubs against the metal disk, and is forced to rotate when the metal disk rotates. The rubber disk can be moved longitudinally along its shaft (which coincides with a diameter of the metal disk), varying the speed of the rubber disk's rotation. If the rubber disk crosses the center point of the metal disk then its rotations stops and reverses. As a method of power transmission, the idea is an old one, and this patent does not cover that idea per se. Therefore, it is quite possible that there are older versions of this drill press design.

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