Patent ID: 8789809

Claim:
An auxiliary device for alignment of floor boards on a floor when laying plank flooring, the auxiliary device being a tensioning unit comprising: a first floor-side, protruding, lower contact jaw and a second floor-side, protruding, lower contact jaw, the first contact jaw and the second contact jaws being configured for resting against board side edges, a displacement guide connecting the first and second contact jaws, the displacement guide being configured for varying the distance between the first contact jaw and the second contact jaw, the displacement guide consisting of first and second guide parts connected to a respective one of the first and second contact jaws and connected to each other in a telescoping, length-displaceable manner, an upper lever mechanism positioned longitudinally between the first and second contact jaws, the lever mechanism being configured to operate according to a toggle principle and being connected to the first and second contact jaws such that by pivoting of the lever mechanism, the first and second contact jaws are moved from a starting position with a first jaw distance from each other into a tensioned position with a second, defined jaw distance from each other, the first jaw distance being greater than the defined jaw distance, adjusting means for adjusting of the defined jaw distance of the contact jaws in the tensioned position, the adjusting means including a fine adjustment means for varying a length of a pull lever via a screw connection and a stepped rough adjustment means, wherein the pull lever has an eyelet-like hoop element at a free end, the hoop element configured to be detachably suspended in a receptacle connected to the second guide part so that the hoop element is rotatable for fine adjustment of the screw connection in a detached state and wherein for rough adjustment, the first contact jaw connected to the first guide part is configured to be connected to the first guide part via a retaining part and to be locked in different positions for a rough adjustment of the defined jaw distance.