| 摘要 |
In a shaft and rotor assembly for a variable resistor device or the like the rotor member is provided with a slotted opening having an undercut lower portion of a width substantially greater than the upper portion of the opening. The shaft is provided with a driving head having substantially the shape of a parallelepiped in which a pair of upper and lower surfaces are arranged substantially normal to the axis of the shaft. The distance between the upper and lower parallel surfaces is slightly less than the depth of the lower portion of the slotted opening in the rotor and the sides of the head are arranged to mate substantially with the side walls of the slot in the rotor so that the shaft may be slid into the lower portion of the slot with the shank of the shaft extending through the upper portion of the slot. The upper surface of the head abuts against the upper surface of the undercut lower portion of the slot thereby preventing axial movement of the head and shaft with respect to the rotor. Lateral movement of the head with respect to the rotor is prevented by an extension from the lower surface of the head which fits into a mating opening formed on the lower surface of the slot.
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