FIELD: machine building.
SUBSTANCE: combined grab retraction control mechanism includes a gripping tool with radial gripping elements and a grab retraction control mechanism containing an annular housing with a central inner channel and a peripheral outer surface, stiff spokes and guide spokes located on the annular housing so that they can radially move from retracted position to engaged position. According to the method of enlarging the grab working range, the gripping tool is provided with radial gripping elements; the above grab retraction control method is provided; the item or the cylindrical gripping tool is installed in a central inner channel of the annular housing and the other item or the cylindrical griping tool around peripheral outer surface of the annular housing with spikes located in annular space between gripping elements of the gripping tool and the item. One end of each spoke is engaged with gripping elements, and the other end of each spoke is directly or indirectly engaged with the item; gripping elements of the gripping tool are moved radially so that gripping elements can exert pressure on the first end of each spoke. Besides, spokes are radially moved from retracted position to extended position and act as radial extension pieces of gripping elements of the gripping tool.
EFFECT: providing transfer of axial and torsional loads on the gripped tube item or from it; enlarging the grab working range.
16 cl, 8 dwg
