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US Patent: 1,574,020
Electric-cord protector
Patentees:
Alonzo Galloway Decker - Baltimore, MD
Samuel Duncan Black - Baltimore, MD

USPTO Classifications:
439/447

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

Assignees:
Black & Decker Manufacturing Co. - Towson, MD

Manufacturer:
Black & Decker Manufacturing Co. - Towson, MD

Witnesses:
Unknown

Patent Dates:
Applied: May 19, 1923
Granted: Feb. 23, 1926

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for Black & Decker Manufacturing Co., Ltd.
Description:
The invention is the molded-rubber strain relief for the electrical cord. Previous strain reliefs had been made either from coiled wire or a uniform-cross-section length of rubber hose. Messrs. Black and Decker had the idea of using a rubber strain relief similar to a length of rubber hose, but of decreasing cross-sectional thickness so as to distribute the bending forces over a length of the cord.

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