| 摘要 |
FIELD: manual tools, namely holder of screw driver bit. ^ SUBSTANCE: holder includes rod having connection part, C-shaped stop groove for fixing C-shaped stop ring, spring and reverse stop dent for unscrewing screw. Holder also includes large number of openings for fixing balls, annular groove engaged with positioning ball and sleeve with opening for rod and with inner annular dent. One end of said spring is mounted in inner annular dent. Adjustment sleeve with internal thread is designed for engaging with outer thread of above mentioned sleeve. Concave groove is formed in inner wall of adjustment sleeve. At using screw driver said groove engages with positioning ball for adjusting securing positions of both sleeves in order to adjust value of extension of screw drive bit for different depth of screwing/unscrewing. ^ EFFECT: elimination of twisting effort of bit of screw driver after termination of screw mounting. ^ 10 cl, 20 dwg |
