Power driven screwdriver

A power driven screwdriver comprising:

• a housing:
• a motor mounted within said housing:
• a spindle rotatably mounted within said housing for engagement with a driver bit for driving a screw, said spindle being axially movable relative to said housing between a first position and a second position;
• biasing means for normally biasing said spindle toward said first position;
• a drive member rotatably driven by said motor;
• a clutch mechanism interposed between said spindle and said drive member, said clutch mechanism disconnecting said drive member from said spindle when said spindle is positioned at said first position, and said clutch mechanism permitting transmission of rotation of said drive member to said spindle when said spindle is positioned at said second position;
• and
• a device interposed between said spindle and said housing for preventing rotation of said spindle, said device including a first member and a second member, said first member being disposed on said spindle and rotatable therewith, said second member being fixed to said housing and axially opposed to said first member, said first and second members including a first conical surface and a second conical surface, respectively, said first and second conical surfaces having central axes parallel to a central axis of said spindle, respectively, and being opposed to each other, at least one of the central axes of said first and second conical surfaces being displaced from the central axis of said spindle, and said first conical surface contacting said second surface when said spindle is positioned at said first position.