| 摘要 |
An attachment means which attaches the device close to the front end of the bit of a power driver or an electric screwdriver, a screw capturing chuck means with several elastic holding fingers, the front end of said holding fingers being placed around t he circumference of an opening in which the head of the screw is engaged, spring means when the front end of the said screw chuck receives a force in the opposite direction from the directi on of a screw being screwed by the bit, the spring means allows retraction of the screwchuck, an d a caliper adjustment means that is attached to the said screw capturing device and adjusts the inner diameter of the opening for receiving the screw by the resilient fingers.</S DOAB>
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