| 摘要 |
A magnetizer/demagnetizer for integration with a non-operative portion of a hand-held driving tool or the like includes an elongate handle which defines a tool axis and is suitably shaped and dimensioned to be graspable within the hand of the user. The driving tool may be in the form of a fixed, precision or other drivers in which the driver members, such as flat blade and Phillips screwdriver tips are mounted at one axial end of the handle. The handle defines a driver axis generally coaxially aligned with the tool axis. The driving tool has at least one permanent magnet provided on the handle, the magnet being formed of a magnetized material having north and south poles defining a magnetic axis generally arranged on the handle to permit selective placement of a magnetizable element at at least one position along the magnetic axis at a predetermined distance from one of the poles to magnetize the element and placement of the element at one of a plurality of selected distances each greater than such predetermined distance of the other of the poles to demagnetize the element. Indicia, such as grooves, notches or steps, are provided on the non-operative portion of the driving tool or the like for providing an indication of a desired or preferred position for placement of the magnetizable element to be demagnetized. The magnetic axis is either aligned with or offset from the driver axis. In this way, a magnetizable element of a given size may be initially magnetized by positioning same adjacent to one of the poles and subsequently substantially or fully demagnetized by positioning the magnetizable element a selected distance from the other of the poles as indicated by the indicia. The magnets used have an energy product equal to at least 7.0x106 gauss-oersteds.
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