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US Patent: 560,171
Multiple drill
August J. Oehring - Chicago, IL

USPTO Classifications:
408/117, 408/127, 408/237, 74/665.00R

Tool Categories:
metalworking machines : drilling and boring : drill presses : multiple spindle drill presses

August J. Oehring - Chicago, IL
Pratt & Whitney Co. - Hartford, CT

Not known to have been produced

Irvine Miller
M. E. Dayton

Patent Dates:
Applied: Mar. 03, 1891
Granted: May 12, 1896

Patent Pictures:
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"Vintage Machinery" entry for Pratt & Whitney Co.
This was apparently a fairly important patent because the drill spindles were both universally (i.e., simultaneously) and individually adjustable. No previous drill had provided this combination of adjustability, where all adjustments could be made in all directions.

The patent specification says "Assignor of one-third to the Pratt & Cady Company, of Hartford, Connecticut." A lawsuit involving this patent indicates that the assignee was the Pratt & Whitney Company. The lawsuit was against Wm. Gardam & Son of New York. The lawsuit originally resulted in a finding largely against the complainant, Pratt & Whitney, but the decision was reversed on appeal.

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