| 摘要 |
A self-tightening drill chuck has a rotatable housing carrying a first element formed with a tapered seat on which a plurality of angularly-spaced wedgelike jaws are provided. A second element axially engages the jaws and either the first or second element is threaded on the housing such that its rotation displaces the jaws radially and axially on the seat to clamp the shank of a tool. A body is provided in the housing to form an abutment for the shank end, this body is connected to the other element by means which translate axial pressure against the body in one direction into opposite axial displacement of the jaws to tighten them while forming a shock-absorbing mechanical cushion. Mechanism is also provided which prevents reverse displacement of the jaws during use of the tool, but which permits such displacement for removal of the tool. |
