Turnbuckle for tensioning frame formwork elements

A turnbuckle for tensioning frame formwork elements, the turnbuckle comprising a first clamping apparatus which has a crosspiece and a first clamping jaw, wherein the crosspiece has a guide portion comprising a row of track teeth which are arranged behind one another and extend in parallel with one another, and comprising a second clamping apparatus which has a second clamping jaw, wherein the second clamping apparatus can be shifted in a tensioning direction along the longitudinal axis of the crosspiece towards the first clamping jaw,

• wherein, the track teeth extend in each case in an arc from a first longitudinal edge of the crosspiece towards a second longitudinal edge of the crosspiece, and wherein the second clamping apparatus has at least one support tooth which extends in an arc and can be rotated about a rotational shaft, wherein the rotational shaft extends orthogonally to an upper side of the crosspiece, wherein by means of a screwing-in movement, the support tooth can be screwed into a track between two track teeth and can be brought into engagement with one of the track teeth, and wherein an incline of the arc extension of the support tooth and an incline of the arc extension of the track teeth are matched to one another such that, after the support tooth is brought into engagement with a track tooth, a further screwing-in movement of the support tooth applies a force to the second clamping apparatus, which force is suitable for pressing the second clamping apparatus in the tensioning direction,
• wherein, the second clamping apparatus has a rotary disk, wherein the support tooth is formed on a main surface of the rotary disk and the rotational shaft about which the support tooth is rotatable is the rotational shaft of the rotary disk,
• wherein, the rotary disk is arranged in the width direction of the crosspiece such that the rotational shaft of the rotary disk is located centrally between the longitudinal edges of the crosspiece and extends orthogonally to an upper side of the crosspiece.