Abstract: A connecting device for first and second rods has a first profile provided on the first rod and a second profile provided on the second rod. The first and second profiles are joined in a connecting position along a partition line by being moved relative to one another in a direction of a degree of freedom predetermined by the first and second profiles. The first and second profiles are moved immediately before reaching the connecting position in the direction of the predetermined degree of freedom. The first and second profiles in the joined state define a cutout bridging the partition line. A locking bar matching the cross-section of the cutout is inserted into the cutout and provides a movability lock for locking a unit, formed of the first and second rods and the locking bar, in a locking direction opposite to the direction of the degree of freedom.

Abstract: A frame for pallets includes a plurality of frame bars that define a surface of the frame to which a frame insert is secured in a manner enabling the frame insert to be loaded transversely within a plane of the frame. The frame insert is form-fittingly interlocked with at least one frame bar transversely to the plane of the frame.

Abstract: A sheet material, especially fabric, is tensioned in a stretching frame made up of frame sections which have grooves open at the surface at which the fabric or sheet material is applied and receiving two rigid symmetrical bars such that the sheet material is looped around one of these bars, passes between this bar and a wall of the groove and passes between the two bars, the groove being formed with opposite walls which converge toward the groove mouth which has overhang and is dimensioned to receive the bars. When the sheet material is tensioned, the one bar is pulled by the loop toward the mouth and the other bar rolls against the wall portion of the groove until both bars are wedged in the groove and the sheet material is clamped between the one bar and a wall portion of the groove and between the two bars.