| 摘要 |
Abstract A screw driving device is provided which can 5 countersink a screw at angles off of normal from a workpiece. The device includes a shank held in contact with a screw bit to drive the tip when a plurality of balls are held in contact between a screw bit head and a sleeve surrounding the shank and to disengage the shank 10 from the bit when the screw is at a desired countersunk depth. The disengagement of the shank from the screw bit is provided by permitting the plurality of balls to slide out of contact between the rotating shank and bit to thus disengage the shank from the screw bit. N /Mlom/ae/aet700799P78.USei/720A Specification 2008-3-1 9 1 doc 19103/08 G25 51 FIG.4 24 20 -37 33- 34 5030 36 39 1 10 31 13 18 44 33 52 2 4- 20 12 32-1 16 37- 32 12*2 |
