Attachment arrangement and a tool for locking an attachment arrangement

An attachment element to be inserted into an opening of a mounting structure for attaching a part to the mounting structure, comprising:

• a locking element for locking the attachment element to the mounting structure, wherein the locking element is configured to be inserted as a part of the attachment element along an insertion direction into the opening in the mounting structure up to an end position and to engage behind the opening in the end position such that the locking element prevents removal of the attachment element from the opening and thus locks the attachment element to the mounting structure;
• at least a first section and a second section that are configured to rest against an edge of the opening in succession when the attachment element is inserted through the opening such that, due to action of the edge of the opening, a return force is applied to the attachment element opposite to the insertion direction;
• and
• two stop elements configured to be positioned above the opening adjacent to an outer surface of the mounting structure and that delimit the insertion of the attachment element into the opening in the insertion direction,
• wherein the first and second sections are designed and arranged such that the return force on the attachment element when the second section is inserted through the opening is larger than the return force on the attachment element when the first section is inserted through the opening,
• wherein the locking element is configured such that the first and second sections reach behind the opening in the end position of the locking element,
• wherein the first section extends at a first angle from the insertion direction and the second section extends at a second angle from the insertion direction,
• wherein the first angle is different from the second angle,
• wherein the two stop elements each have at least one first section that essentially continues crosswise to the insertion direction, and at least a second section that is bent relative to the first section in the insertion direction, and
• wherein the two stop elements are configured in such a way that, before inserting the attachment element into the opening, the second section of one of the two stop elements is bent inwardly stronger in the insertion direction than the second section of the other of the two stop elements.

An attachment element for insertion into an opening of a mounting structure, comprising:

• a locking element configured to locking the attachment element to the mounting structure, wherein said locking element is configured to be inserted as a part of the attachment element along an insertion direction into the opening in the mounting structure up to an end position and to engage an inner surface of the mounting structure and behind the opening in the end position such that removal of the attachment element from the opening is prevented, thus locking the attachment element to the mounting structure, wherein the locking element has at least first and second sections that are configured to rest against an edge of the opening in succession when inserting the attachment element through the opening such that, due to action of the edge of the opening, a return force is applied to the attachment element opposite to the insertion direction;
• and
• two stop elements configured to be positioned above the opening adjacent to an outer surface of the mounting structure and that delimit the insertion of the attachment element into the opening in the insertion direction,
• wherein the two stop elements each have at least one first section that essentially continues crosswise to the insertion direction, and at least a second section that is bent relative to the first section in the insertion direction, and
• wherein the two stop elements are configured in such a way that, before inserting the attachment element into the opening, the second section of one of the two stop elements is bent inwardly stronger in the insertion direction than the second section of the other of the two stop elements.