| 摘要 |
A driving tool includes a shank, a sleeve, and a return spring disposed therebetween. The shank has a ball recess with a ball received therein. The shank has an interior interface adapted for receiving a tool bit. The ball recess substantially extends into the interior interface. The sleeve mounts on the shank to slide between limits. The sleeve has a first interior ball release recess followed by an interior ball lock surface and then a second interior ball release recess. The release recesses and surface are oriented with respect to the ball recess so as to permit selective displacement of the same over the ball recess to unlock the ball with movement in either direction. A return spring is disposed between the shank and the sleeve. The spring has a first and second end. One of the ends of the spring acts against a feature fixed with the shank and the other end of the spring acts against a feature fixed with the sleeve in a manner so as to permit selective displacement of the ball release recess and lock surface over the ball recess. The position of least spring potential energy is the position with the surface located just above the ball recess so as to tend to lock the ball into engagement with tool bit when the sleeve is in a rest position.
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