Patent ID: 6986517

Claim:
A coupling tube for a screwdriver head comprising: a) a main body with a cylindrical shape and having: i) an engaging seat located on a first end thereof and having an internal hole and an external annular slot communicating with the internal hole, the screwdriver head is removably inserted into the internal hole; ii) an engaging element inserted into the external annular slot and being a semicircular ring having an engaging face protruding into the internal hole and selectively engaging a V-shaped indentation in the screwdriver head; iii) an insertion rod connected to a second end thereof; iv) a first engaging annular slot located in a middle of the main body; v) a first engaging ring inserted into the first engaging annular slot; vi) a second engaging annular slot located between the first engaging annular slot and the insertion rod, the first engaging annular slot is located between the second engaging annular slot and the external annular slot; and vii) a second engaging ring inserted into the second engaging annular slot; b) a socket inserted over the first end of the main body and having a conic slot located on an interior of a first socket end, a diameter of the interior of a second socket end is larger that a diameter of the first socket end forming an accommodation; and c) a spring element is located in the accommodation and engaging the first engaging ring, the first engaging ring is located between the spring element and the second engaging ring.