Tensioning element, closing clamp with a clamping element and the housing with a clamping closure

Clamping element (1) having a mounting bracket (2) which is provided at a first coupling part or attached, a clamping part (3) and a Zughakenteil (4) which is engageable with a corresponding locking hook of a second coupling part engages, wherein the clamping part (3) at its one end via an articulation joint (5) with the mounting bracket (2) and at its other end via a hinge joint (6) with the Zughakenteil (4) is connected, the clamping element (1) is manufactured in one piece from plastic and the articulated connections (5, 6) are designed as a film hinge connections, characterized, in that a safety device is provided with which the clamping element (1), is securable in its closed position in which it exerts a pulling force on the second coupling part in engagement with the locking hook with securing means, wherein the securing means comprises at least two corresponding passages (10, 12) which on the fixing bracket (2) and formed on the clamping part (3) and designed in such are that they are in the closed position of the clamping element (1) has a common passage for the securing means form.