Abstract: A turnable, generally box-girder-shaped gate for a truck platform with an operating device intended for actuation of the gate, comprising a drive device and a link coupling which is connected between the gate and the drive device for locking the gate in a non-activated state of the drive device. The link coupling includes a first link articulately connected to the gate and to a second link, the other end of the second link being fixedly connected to a stationary, but turnable, shaft. The shaft is connected via a third link to the drive device. In the locked position of the gate, the fulcrum of the first link with the second link lies along a substantially straight line which runs between the center of the shaft and the fulcrum between the first link and the gate in the non-activated state of the drive device. The fulcrum of the first link with the second link is arranged to be moved upwards by the drive device during unlocking of the gate.