Tools – Wrench – screwdriver – or driver therefor – Having work engaging and force exerting portion inserted...
81125, 81438, B25B 2312
A composite magnetic-field screwdriver (10) that consists of two elements: a non magnetic-conductive housing (12) and a selectable, magnetic-conductive tool bit (100). The housing (12) includes a tool bit cavity (80) that accepts the tool bit (100) and a drill-chuck connector sleeve (48) into which is frictionally inserted a non magnetic-conductive drill chuck connector (88). The housing (12) includes an upper ring magnet (60) and a lower circular magnet (84). The two magnets operate in combination to produce a composite magnetic flux path. The composite magnetic flux path is activated only when a workpiece (250) is attached to a tool bit (100) that has been inserted into the tool bit cavity (80). The composite magnetic flux path results in a high-level gauss at the bit's upper section which allows the workpiece i.e., a screw to be firmly attached to the tool bit (100). In a second embodiment, a magnetic housing (150) is utilized that is designed to contain a single concentric dual magnet (174) in lieu of the two magnets of the preferred embodiment. The dual magnet (174) also produces a composite magnetic flux path that functions in a similar manner as described for the preferred embodiment.
patent: 2838082 (1958-06-01), Lange
patent: 3007504 (1961-11-01), Clark
patent: 5012708 (1991-05-01), Martindell
Cota Albert O.
Eley Timothy V.
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