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US Patent: 1,864,707
Slip bushing
Carroll R. Alden - Detroit, MI

USPTO Classifications:
384/296, 408/241R

Tool Categories:
metalworking machines : drilling and boring : drill presses : drill press accessories

Ex-Cell-O Aircraft & Tool Corp. - Detroit, MI

Ex-Cell-O Corp. - Detroit, MI


Patent Dates:
Applied: Jul. 12, 1929
Granted: Jun. 28, 1932

Patent Pictures:
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"Vintage Machinery" entry for Ex-Cell-O Machine Tools, Inc.
Ex-Cell-O claimed to have created the concept of the standardized drill bushing; they dominated that market from the mid-1920s and for some years afterwards. This patent covers a bushing design "without recesses wherein dirt and chips may gather". In addition, the bushing may be turned in either direction to lock the two pieces together.

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