Safety removable anchoring device

A removable anchoring device, designed to be fixed in a bore hole and able to be easily disassembled and recovered from the bore hole, the removable anchoring device comprising:

• a fixed first part with an expansion head,
• a second movable control part having wedging means collaborating with the expansion head to perform blocking or releasing of the removable anchoring device inside the bore hole, and a gripping knob connected to the wedging means by operating rods, and
• a spring biasing the wedging means in a blocking direction, wherein the gripping knob is associated with a stop arranged on the fixed first part, and the gripping knob being movable with respect to the stop by a relative translational movement to disable any release command in a predefined position of the gripping knob,
• wherein the wedging means comprise at least two half-rings driven by the operating rods solidly attached to a drive sleeve, the gripping knob being mounted on the drive sleeve, and
• wherein the gripping knob comprises a tapped axial bore, the tapped axial bore collaborating with a conjugate thread provided on the drive sleeve to move the gripping knob between a first axial adjustment position offset from the stop to indicate a non-locked state enabling the release command, and a second axial adjustment position in engagement against the stop to indicate a locked state and to disable the release command.