| 摘要 |
A ferrule for coupling an attachment to a rotary hand tool unit of the type that has a housing with a nose portion through which a rotary output shaft extends. The nose portion has at least one groove extending generally circumferentially around at least a part of the nose portion, so that a groove portion is located on opposite sides of the nose portion. The ferrule includes a generally hollow cylindrical body with interior and exterior surfaces with an open mounting end portion and a smaller opposite end portion to which the attachment is mounted. The open mounting end portion fits on the nose portion of the housing when the ferrule is coupled to the rotary hand tool. The ferrule farther includes at least one internally protruding rib on the interior surface for aligning the ferrule in at least one predetermined angular position, and at least two latches mounted on the ferrule, with each latch having an open and a closed position wherein the ferrule is locked into the nose portion when the latch is in the closed position.
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