Change system for loading cranes

A system for changing work tools on a loading crane, the system comprising:

• a first coupling member on one of a work tool side and a loading crane side with a receiving opening;
• and
• a second coupling member on the other of the loading crane side and the work tool side with a guide member extending along a longitudinal axis, the guide member engageable in the receiving opening of the first coupling member by moving the first coupling member and the second coupling member toward each other in a direction of the longitudinal axis,
• wherein the first coupling member comprises a support surface for axially abutting the second coupling member,
• the second coupling member comprises:
• a bearing surface that is complementary to the support surface of the first coupling member;
• and
• at least one locking element which is moveable by a drive at right angles relative to the longitudinal axis of the second coupling member between a disengaged position and a retaining position,
• the at least one locking element includes a clamping surface for frictionally abutting the first coupling member,
• the first coupling member includes an abutment surface that is complementary to the clamping surface of the at least one locking element so as to provide zero-play axial clamping of the first coupling member and the second coupling member when the at least one locking element is in the retaining position, and
• the clamping surface of the at least one locking element and the abutment surface of the first coupling member are designed as mutually corresponding inclined surfaces that have the same angle of inclination when the at least one locking element is in the retaining position, and
• wherein at least one bolt is radially movable within a guide sleeve disposed in the first coupling member;
• wherein the at least one bolt is radially pushed outward by the at least one locking element when the at least one locking element is moved from the disengaged position into the retaining position;
• and
• wherein an end of the at least one bolt protrudes outwardly from the guide sleeve relative to an exterior surface of the first coupling member, thereby providing a visual indicator of a correct locking position.