Patent attributes
A driving head-changeable tool is provided, comprising an outer sleeve and an inner sleeve. The outer sleeve has an end peripheral edge and a non-circular circumferential inner wall. The end peripheral edge is formed with corner portions and blocking flanges. The inner sleeve has a non-circular circumferential outer wall. The inner sleeve is rotatably sleeved by the outer sleeve and has a first connecting end along a central axis. An inner wall of the first connecting end is formed with concaves extending axially. The non-circular circumferential inner and outer walls are nonrotatably abutted against each other. As viewed in an axial direction, each concave overlaps with one the blocking flange. When a driving head is inserted in the inner sleeve and the outer sleeve and the inner sleeve come close to each other, the driving head is blocked by the blocking flanges.
