Clamping device for drill columns, pipes or similar objects

摘要

The invention is intended to reliably prevent the part located in the device from slipping out completely if the clamping should no longer be fully effective or if it should be inadequate. This applies to all objects, in particular conventional drill-column parts, in which, apart from an end area permitting clamping jaws to engage, there is at least one adjacent area of smaller diameter. For this purpose, a movable locking piece is arranged on at least one clamping jaw. The locking piece can be moved radially inwards as a function of a relative movement and, in the clamping position of the clamping jaw, extends further inwards in the radial direction than the clamping area of the clamping jaw. <IMAGE>