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US Patent: 1,229,401
Drill gearing
Alonzo Galloway Decker - Orangeville, MD
Samuel Duncan Black - Baltimore, MD

USPTO Classifications:
310/50, 310/83, 451/294, 451/344, 476/14, 476/35, 476/58

Tool Categories:
specialty tools : handheld power tools
woodworking machines : handheld power tools


Black & Decker Manufacturing Co. - Towson, MD


Patent Dates:
Applied: Mar. 23, 1916
Granted: Jun. 12, 1917

Patent Pictures:
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"Vintage Machinery" entry for Black & Decker Manufacturing Co., Ltd.
"The primary object of this invention is the provision in a portable drill of a variable speed disk drive between the power motor of the drill and the chuck spindle or such other member as drives the drill directly. Another object of the invention is to utilize an element of this disk drive as a fan for creating an air draft to cool the motor."

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