| 摘要 |
<p>An automatic power-driven screwdriver comprises a first cylindrical member (21) having a hand grip portion, a guide portion (21 a), a tapered portion (21 b) and a flanged portion (21c) between the tapered and hand grip portions. A second cylindrical member (24), which is a nose portion of the screwdriver, is mounted to telescope over the guide portion (21a). A third cylindrical member (23) encircles the guide portion and is slidably mounted at one end over the second cylindrical member (24). The third member is formed with a tapered contacting surface complementary to the surface of the tapered portion (21 b) of the first member. An adjusting nut (40) having an inwardly extending flange (40a) is mounted on the first member with the flange being in contact with the flanged portion (21 c) and isthreadably engaged with the third member (23) so that the tapered contacting surfaces are brought into firm pressure contact which enables the first and second cylindrical members to be secured firmly together. However, upon loosening the nut, the nose portion of the apparatus can be rotated to any desired angular position with respect to the hand grip portion so that a screw feeder tube (27), which is connected to the nose portion, can be positioned to avoid any obstacle which might be present in the area of use.</p> |
